drivers/net/wireless/brcm80211/brcmfmac/sdio.c

   1 /*
   2  * Copyright (c) 2010 Broadcom Corporation
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/kthread.h>
  20 #include <linux/printk.h>
  21 #include <linux/pci_ids.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/sched.h>
  25 #include <linux/mmc/sdio.h>
  26 #include <linux/mmc/sdio_ids.h>
  27 #include <linux/mmc/sdio_func.h>
  28 #include <linux/mmc/card.h>
  29 #include <linux/semaphore.h>
  30 #include <linux/firmware.h>
  31 #include <linux/module.h>
  32 #include <linux/bcma/bcma.h>
  33 #include <linux/debugfs.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/platform_data/brcmfmac-sdio.h>
  36 #include <linux/moduleparam.h>
  37 #include <asm/unaligned.h>
  38 #include <defs.h>
  39 #include <brcmu_wifi.h>
  40 #include <brcmu_utils.h>
  41 #include <brcm_hw_ids.h>
  42 #include <soc.h>
  43 #include "sdio.h"
  44 #include "chip.h"
  45 #include "firmware.h"
  46
  47 #define DCMD_RESP_TIMEOUT       2000    /* In milli second */
  48 #define CTL_DONE_TIMEOUT        2000    /* In milli second */
  49
  50 #ifdef DEBUG
  51
  52 #define BRCMF_TRAP_INFO_SIZE    80
  53
  54 #define CBUF_LEN        (128)
  55
  56 /* Device console log buffer state */
  57 #define CONSOLE_BUFFER_MAX      2024
  58
  59 struct rte_log_le {
  60         __le32 buf;             /* Can't be pointer on (64-bit) hosts */
  61         __le32 buf_size;
  62         __le32 idx;
  63         char *_buf_compat;      /* Redundant pointer for backward compat. */
  64 };
  65
  66 struct rte_console {
  67         /* Virtual UART
  68          * When there is no UART (e.g. Quickturn),
  69          * the host should write a complete
  70          * input line directly into cbuf and then write
  71          * the length into vcons_in.
  72          * This may also be used when there is a real UART
  73          * (at risk of conflicting with
  74          * the real UART).  vcons_out is currently unused.
  75          */
  76         uint vcons_in;
  77         uint vcons_out;
  78
  79         /* Output (logging) buffer
  80          * Console output is written to a ring buffer log_buf at index log_idx.
  81          * The host may read the output when it sees log_idx advance.
  82          * Output will be lost if the output wraps around faster than the host
  83          * polls.
  84          */
  85         struct rte_log_le log_le;
  86
  87         /* Console input line buffer
  88          * Characters are read one at a time into cbuf
  89          * until <CR> is received, then
  90          * the buffer is processed as a command line.
  91          * Also used for virtual UART.
  92          */
  93         uint cbuf_idx;
  94         char cbuf[CBUF_LEN];
  95 };
  96
  97 #endif                          /* DEBUG */
  98 #include <chipcommon.h>
  99
 100 #include "bus.h"
 101 #include "debug.h"
 102 #include "tracepoint.h"
 103
 104 #define TXQLEN          2048    /* bulk tx queue length */
 105 #define TXHI            (TXQLEN - 256)  /* turn on flow control above TXHI */
 106 #define TXLOW           (TXHI - 256)    /* turn off flow control below TXLOW */
 107 #define PRIOMASK        7
 108
 109 #define TXRETRIES       2       /* # of retries for tx frames */
 110
 111 #define BRCMF_RXBOUND   50      /* Default for max rx frames in
 112                                  one scheduling */
 113
 114 #define BRCMF_TXBOUND   20      /* Default for max tx frames in
 115                                  one scheduling */
 116
 117 #define BRCMF_TXMINMAX  1       /* Max tx frames if rx still pending */
 118
 119 #define MEMBLOCK        2048    /* Block size used for downloading
 120                                  of dongle image */
 121 #define MAX_DATA_BUF    (32 * 1024)     /* Must be large enough to hold
 122                                  biggest possible glom */
 123
 124 #define BRCMF_FIRSTREAD (1 << 6)
 125
 126
 127 /* SBSDIO_DEVICE_CTL */
 128
 129 /* 1: device will assert busy signal when receiving CMD53 */
 130 #define SBSDIO_DEVCTL_SETBUSY           0x01
 131 /* 1: assertion of sdio interrupt is synchronous to the sdio clock */
 132 #define SBSDIO_DEVCTL_SPI_INTR_SYNC     0x02
 133 /* 1: mask all interrupts to host except the chipActive (rev 8) */
 134 #define SBSDIO_DEVCTL_CA_INT_ONLY       0x04
 135 /* 1: isolate internal sdio signals, put external pads in tri-state; requires
 136  * sdio bus power cycle to clear (rev 9) */
 137 #define SBSDIO_DEVCTL_PADS_ISO          0x08
 138 /* Force SD->SB reset mapping (rev 11) */
 139 #define SBSDIO_DEVCTL_SB_RST_CTL        0x30
 140 /*   Determined by CoreControl bit */
 141 #define SBSDIO_DEVCTL_RST_CORECTL       0x00
 142 /*   Force backplane reset */
 143 #define SBSDIO_DEVCTL_RST_BPRESET       0x10
 144 /*   Force no backplane reset */
 145 #define SBSDIO_DEVCTL_RST_NOBPRESET     0x20
 146
 147 /* direct(mapped) cis space */
 148
 149 /* MAPPED common CIS address */
 150 #define SBSDIO_CIS_BASE_COMMON          0x1000
 151 /* maximum bytes in one CIS */
 152 #define SBSDIO_CIS_SIZE_LIMIT           0x200
 153 /* cis offset addr is < 17 bits */
 154 #define SBSDIO_CIS_OFT_ADDR_MASK        0x1FFFF
 155
 156 /* manfid tuple length, include tuple, link bytes */
 157 #define SBSDIO_CIS_MANFID_TUPLE_LEN     6
 158
 159 #define CORE_BUS_REG(base, field) \
 160                 (base + offsetof(struct sdpcmd_regs, field))
 161
 162 /* SDIO function 1 register CHIPCLKCSR */
 163 /* Force ALP request to backplane */
 164 #define SBSDIO_FORCE_ALP                0x01
 165 /* Force HT request to backplane */
 166 #define SBSDIO_FORCE_HT                 0x02
 167 /* Force ILP request to backplane */
 168 #define SBSDIO_FORCE_ILP                0x04
 169 /* Make ALP ready (power up xtal) */
 170 #define SBSDIO_ALP_AVAIL_REQ            0x08
 171 /* Make HT ready (power up PLL) */
 172 #define SBSDIO_HT_AVAIL_REQ             0x10
 173 /* Squelch clock requests from HW */
 174 #define SBSDIO_FORCE_HW_CLKREQ_OFF      0x20
 175 /* Status: ALP is ready */
 176 #define SBSDIO_ALP_AVAIL                0x40
 177 /* Status: HT is ready */
 178 #define SBSDIO_HT_AVAIL                 0x80
 179 #define SBSDIO_CSR_MASK                 0x1F
 180 #define SBSDIO_AVBITS           (SBSDIO_HT_AVAIL | SBSDIO_ALP_AVAIL)
 181 #define SBSDIO_ALPAV(regval)    ((regval) & SBSDIO_AVBITS)
 182 #define SBSDIO_HTAV(regval)     (((regval) & SBSDIO_AVBITS) == SBSDIO_AVBITS)
 183 #define SBSDIO_ALPONLY(regval)  (SBSDIO_ALPAV(regval) && !SBSDIO_HTAV(regval))
 184 #define SBSDIO_CLKAV(regval, alponly) \
 185         (SBSDIO_ALPAV(regval) && (alponly ? 1 : SBSDIO_HTAV(regval)))
 186
 187 /* intstatus */
 188 #define I_SMB_SW0       (1 << 0)        /* To SB Mail S/W interrupt 0 */
 189 #define I_SMB_SW1       (1 << 1)        /* To SB Mail S/W interrupt 1 */
 190 #define I_SMB_SW2       (1 << 2)        /* To SB Mail S/W interrupt 2 */
 191 #define I_SMB_SW3       (1 << 3)        /* To SB Mail S/W interrupt 3 */
 192 #define I_SMB_SW_MASK   0x0000000f      /* To SB Mail S/W interrupts mask */
 193 #define I_SMB_SW_SHIFT  0       /* To SB Mail S/W interrupts shift */
 194 #define I_HMB_SW0       (1 << 4)        /* To Host Mail S/W interrupt 0 */
 195 #define I_HMB_SW1       (1 << 5)        /* To Host Mail S/W interrupt 1 */
 196 #define I_HMB_SW2       (1 << 6)        /* To Host Mail S/W interrupt 2 */
 197 #define I_HMB_SW3       (1 << 7)        /* To Host Mail S/W interrupt 3 */
 198 #define I_HMB_SW_MASK   0x000000f0      /* To Host Mail S/W interrupts mask */
 199 #define I_HMB_SW_SHIFT  4       /* To Host Mail S/W interrupts shift */
 200 #define I_WR_OOSYNC     (1 << 8)        /* Write Frame Out Of Sync */
 201 #define I_RD_OOSYNC     (1 << 9)        /* Read Frame Out Of Sync */
 202 #define I_PC            (1 << 10)       /* descriptor error */
 203 #define I_PD            (1 << 11)       /* data error */
 204 #define I_DE            (1 << 12)       /* Descriptor protocol Error */
 205 #define I_RU            (1 << 13)       /* Receive descriptor Underflow */
 206 #define I_RO            (1 << 14)       /* Receive fifo Overflow */
 207 #define I_XU            (1 << 15)       /* Transmit fifo Underflow */
 208 #define I_RI            (1 << 16)       /* Receive Interrupt */
 209 #define I_BUSPWR        (1 << 17)       /* SDIO Bus Power Change (rev 9) */
 210 #define I_XMTDATA_AVAIL (1 << 23)       /* bits in fifo */
 211 #define I_XI            (1 << 24)       /* Transmit Interrupt */
 212 #define I_RF_TERM       (1 << 25)       /* Read Frame Terminate */
 213 #define I_WF_TERM       (1 << 26)       /* Write Frame Terminate */
 214 #define I_PCMCIA_XU     (1 << 27)       /* PCMCIA Transmit FIFO Underflow */
 215 #define I_SBINT         (1 << 28)       /* sbintstatus Interrupt */
 216 #define I_CHIPACTIVE    (1 << 29)       /* chip from doze to active state */
 217 #define I_SRESET        (1 << 30)       /* CCCR RES interrupt */
 218 #define I_IOE2          (1U << 31)      /* CCCR IOE2 Bit Changed */
 219 #define I_ERRORS        (I_PC | I_PD | I_DE | I_RU | I_RO | I_XU)
 220 #define I_DMA           (I_RI | I_XI | I_ERRORS)
 221
 222 /* corecontrol */
 223 #define CC_CISRDY               (1 << 0)        /* CIS Ready */
 224 #define CC_BPRESEN              (1 << 1)        /* CCCR RES signal */
 225 #define CC_F2RDY                (1 << 2)        /* set CCCR IOR2 bit */
 226 #define CC_CLRPADSISO           (1 << 3)        /* clear SDIO pads isolation */
 227 #define CC_XMTDATAAVAIL_MODE    (1 << 4)
 228 #define CC_XMTDATAAVAIL_CTRL    (1 << 5)
 229
 230 /* SDA_FRAMECTRL */
 231 #define SFC_RF_TERM     (1 << 0)        /* Read Frame Terminate */
 232 #define SFC_WF_TERM     (1 << 1)        /* Write Frame Terminate */
 233 #define SFC_CRC4WOOS    (1 << 2)        /* CRC error for write out of sync */
 234 #define SFC_ABORTALL    (1 << 3)        /* Abort all in-progress frames */
 235
 236 /*
 237  * Software allocation of To SB Mailbox resources
 238  */
 239
 240 /* tosbmailbox bits corresponding to intstatus bits */
 241 #define SMB_NAK         (1 << 0)        /* Frame NAK */
 242 #define SMB_INT_ACK     (1 << 1)        /* Host Interrupt ACK */
 243 #define SMB_USE_OOB     (1 << 2)        /* Use OOB Wakeup */
 244 #define SMB_DEV_INT     (1 << 3)        /* Miscellaneous Interrupt */
 245
 246 /* tosbmailboxdata */
 247 #define SMB_DATA_VERSION_SHIFT  16      /* host protocol version */
 248
 249 /*
 250  * Software allocation of To Host Mailbox resources
 251  */
 252
 253 /* intstatus bits */
 254 #define I_HMB_FC_STATE  I_HMB_SW0       /* Flow Control State */
 255 #define I_HMB_FC_CHANGE I_HMB_SW1       /* Flow Control State Changed */
 256 #define I_HMB_FRAME_IND I_HMB_SW2       /* Frame Indication */
 257 #define I_HMB_HOST_INT  I_HMB_SW3       /* Miscellaneous Interrupt */
 258
 259 /* tohostmailboxdata */
 260 #define HMB_DATA_NAKHANDLED     1       /* retransmit NAK'd frame */
 261 #define HMB_DATA_DEVREADY       2       /* talk to host after enable */
 262 #define HMB_DATA_FC             4       /* per prio flowcontrol update flag */
 263 #define HMB_DATA_FWREADY        8       /* fw ready for protocol activity */
 264
 265 #define HMB_DATA_FCDATA_MASK    0xff000000
 266 #define HMB_DATA_FCDATA_SHIFT   24
 267
 268 #define HMB_DATA_VERSION_MASK   0x00ff0000
 269 #define HMB_DATA_VERSION_SHIFT  16
 270
 271 /*
 272  * Software-defined protocol header
 273  */
 274
 275 /* Current protocol version */
 276 #define SDPCM_PROT_VERSION      4
 277
 278 /*
 279  * Shared structure between dongle and the host.
 280  * The structure contains pointers to trap or assert information.
 281  */
 282 #define SDPCM_SHARED_VERSION       0x0003
 283 #define SDPCM_SHARED_VERSION_MASK  0x00FF
 284 #define SDPCM_SHARED_ASSERT_BUILT  0x0100
 285 #define SDPCM_SHARED_ASSERT        0x0200
 286 #define SDPCM_SHARED_TRAP          0x0400
 287
 288 /* Space for header read, limit for data packets */
 289 #define MAX_HDR_READ    (1 << 6)
 290 #define MAX_RX_DATASZ   2048
 291
 292 /* Bump up limit on waiting for HT to account for first startup;
 293  * if the image is doing a CRC calculation before programming the PMU
 294  * for HT availability, it could take a couple hundred ms more, so
 295  * max out at a 1 second (1000000us).
 296  */
 297 #undef PMU_MAX_TRANSITION_DLY
 298 #define PMU_MAX_TRANSITION_DLY 1000000
 299
 300 /* Value for ChipClockCSR during initial setup */
 301 #define BRCMF_INIT_CLKCTL1      (SBSDIO_FORCE_HW_CLKREQ_OFF |   \
 302                                         SBSDIO_ALP_AVAIL_REQ)
 303
 304 /* Flags for SDH calls */
 305 #define F2SYNC  (SDIO_REQ_4BYTE | SDIO_REQ_FIXED)
 306
 307 #define BRCMF_IDLE_ACTIVE       0       /* Do not request any SD clock change
 308                                          * when idle
 309                                          */
 310 #define BRCMF_IDLE_INTERVAL     1
 311
 312 #define KSO_WAIT_US 50
 313 #define MAX_KSO_ATTEMPTS (PMU_MAX_TRANSITION_DLY/KSO_WAIT_US)
 314
 315 /*
 316  * Conversion of 802.1D priority to precedence level
 317  */
 318 static uint prio2prec(u32 prio)
 319 {
 320         return (prio == PRIO_8021D_NONE || prio == PRIO_8021D_BE) ?
 321                (prio^2) : prio;
 322 }
 323
 324 #ifdef DEBUG
 325 /* Device console log buffer state */
 326 struct brcmf_console {
 327         uint count;             /* Poll interval msec counter */
 328         uint log_addr;          /* Log struct address (fixed) */
 329         struct rte_log_le log_le;       /* Log struct (host copy) */
 330         uint bufsize;           /* Size of log buffer */
 331         u8 *buf;                /* Log buffer (host copy) */
 332         uint last;              /* Last buffer read index */
 333 };
 334
 335 struct brcmf_trap_info {
 336         __le32          type;
 337         __le32          epc;
 338         __le32          cpsr;
 339         __le32          spsr;
 340         __le32          r0;     /* a1 */
 341         __le32          r1;     /* a2 */
 342         __le32          r2;     /* a3 */
 343         __le32          r3;     /* a4 */
 344         __le32          r4;     /* v1 */
 345         __le32          r5;     /* v2 */
 346         __le32          r6;     /* v3 */
 347         __le32          r7;     /* v4 */
 348         __le32          r8;     /* v5 */
 349         __le32          r9;     /* sb/v6 */
 350         __le32          r10;    /* sl/v7 */
 351         __le32          r11;    /* fp/v8 */
 352         __le32          r12;    /* ip */
 353         __le32          r13;    /* sp */
 354         __le32          r14;    /* lr */
 355         __le32          pc;     /* r15 */
 356 };
 357 #endif                          /* DEBUG */
 358
 359 struct sdpcm_shared {
 360         u32 flags;
 361         u32 trap_addr;
 362         u32 assert_exp_addr;
 363         u32 assert_file_addr;
 364         u32 assert_line;
 365         u32 console_addr;       /* Address of struct rte_console */
 366         u32 msgtrace_addr;
 367         u8 tag[32];
 368         u32 brpt_addr;
 369 };
 370
 371 struct sdpcm_shared_le {
 372         __le32 flags;
 373         __le32 trap_addr;
 374         __le32 assert_exp_addr;
 375         __le32 assert_file_addr;
 376         __le32 assert_line;
 377         __le32 console_addr;    /* Address of struct rte_console */
 378         __le32 msgtrace_addr;
 379         u8 tag[32];
 380         __le32 brpt_addr;
 381 };
 382
 383 /* dongle SDIO bus specific header info */
 384 struct brcmf_sdio_hdrinfo {
 385         u8 seq_num;
 386         u8 channel;
 387         u16 len;
 388         u16 len_left;
 389         u16 len_nxtfrm;
 390         u8 dat_offset;
 391         bool lastfrm;
 392         u16 tail_pad;
 393 };
 394
 395 /*
 396  * hold counter variables
 397  */
 398 struct brcmf_sdio_count {
 399         uint intrcount;         /* Count of device interrupt callbacks */
 400         uint lastintrs;         /* Count as of last watchdog timer */
 401         uint pollcnt;           /* Count of active polls */
 402         uint regfails;          /* Count of R_REG failures */
 403         uint tx_sderrs;         /* Count of tx attempts with sd errors */
 404         uint fcqueued;          /* Tx packets that got queued */
 405         uint rxrtx;             /* Count of rtx requests (NAK to dongle) */
 406         uint rx_toolong;        /* Receive frames too long to receive */
 407         uint rxc_errors;        /* SDIO errors when reading control frames */
 408         uint rx_hdrfail;        /* SDIO errors on header reads */
 409         uint rx_badhdr;         /* Bad received headers (roosync?) */
 410         uint rx_badseq;         /* Mismatched rx sequence number */
 411         uint fc_rcvd;           /* Number of flow-control events received */
 412         uint fc_xoff;           /* Number which turned on flow-control */
 413         uint fc_xon;            /* Number which turned off flow-control */
 414         uint rxglomfail;        /* Failed deglom attempts */
 415         uint rxglomframes;      /* Number of glom frames (superframes) */
 416         uint rxglompkts;        /* Number of packets from glom frames */
 417         uint f2rxhdrs;          /* Number of header reads */
 418         uint f2rxdata;          /* Number of frame data reads */
 419         uint f2txdata;          /* Number of f2 frame writes */
 420         uint f1regdata;         /* Number of f1 register accesses */
 421         uint tickcnt;           /* Number of watchdog been schedule */
 422         ulong tx_ctlerrs;       /* Err of sending ctrl frames */
 423         ulong tx_ctlpkts;       /* Ctrl frames sent to dongle */
 424         ulong rx_ctlerrs;       /* Err of processing rx ctrl frames */
 425         ulong rx_ctlpkts;       /* Ctrl frames processed from dongle */
 426         ulong rx_readahead_cnt; /* packets where header read-ahead was used */
 427 };
 428
 429 /* misc chip info needed by some of the routines */
 430 /* Private data for SDIO bus interaction */
 431 struct brcmf_sdio {
 432         struct brcmf_sdio_dev *sdiodev; /* sdio device handler */
 433         struct brcmf_chip *ci;  /* Chip info struct */
 434
 435         u32 ramsize;            /* Size of RAM in SOCRAM (bytes) */
 436
 437         u32 hostintmask;        /* Copy of Host Interrupt Mask */
 438         atomic_t intstatus;     /* Intstatus bits (events) pending */
 439         atomic_t fcstate;       /* State of dongle flow-control */
 440
 441         uint blocksize;         /* Block size of SDIO transfers */
 442         uint roundup;           /* Max roundup limit */
 443
 444         struct pktq txq;        /* Queue length used for flow-control */
 445         u8 flowcontrol; /* per prio flow control bitmask */
 446         u8 tx_seq;              /* Transmit sequence number (next) */
 447         u8 tx_max;              /* Maximum transmit sequence allowed */
 448
 449         u8 *hdrbuf;             /* buffer for handling rx frame */
 450         u8 *rxhdr;              /* Header of current rx frame (in hdrbuf) */
 451         u8 rx_seq;              /* Receive sequence number (expected) */
 452         struct brcmf_sdio_hdrinfo cur_read;
 453                                 /* info of current read frame */
 454         bool rxskip;            /* Skip receive (awaiting NAK ACK) */
 455         bool rxpending;         /* Data frame pending in dongle */
 456
 457         uint rxbound;           /* Rx frames to read before resched */
 458         uint txbound;           /* Tx frames to send before resched */
 459         uint txminmax;
 460
 461         struct sk_buff *glomd;  /* Packet containing glomming descriptor */
 462         struct sk_buff_head glom; /* Packet list for glommed superframe */
 463         uint glomerr;           /* Glom packet read errors */
 464
 465         u8 *rxbuf;              /* Buffer for receiving control packets */
 466         uint rxblen;            /* Allocated length of rxbuf */
 467         u8 *rxctl;              /* Aligned pointer into rxbuf */
 468         u8 *rxctl_orig;         /* pointer for freeing rxctl */
 469         uint rxlen;             /* Length of valid data in buffer */
 470         spinlock_t rxctl_lock;  /* protection lock for ctrl frame resources */
 471
 472         u8 sdpcm_ver;   /* Bus protocol reported by dongle */
 473
 474         bool intr;              /* Use interrupts */
 475         bool poll;              /* Use polling */
 476         atomic_t ipend;         /* Device interrupt is pending */
 477         uint spurious;          /* Count of spurious interrupts */
 478         uint pollrate;          /* Ticks between device polls */
 479         uint polltick;          /* Tick counter */
 480
 481 #ifdef DEBUG
 482         uint console_interval;
 483         struct brcmf_console console;   /* Console output polling support */
 484         uint console_addr;      /* Console address from shared struct */
 485 #endif                          /* DEBUG */
 486
 487         uint clkstate;          /* State of sd and backplane clock(s) */
 488         bool activity;          /* Activity flag for clock down */
 489         s32 idletime;           /* Control for activity timeout */
 490         s32 idlecount;  /* Activity timeout counter */
 491         s32 idleclock;  /* How to set bus driver when idle */
 492         bool rxflow_mode;       /* Rx flow control mode */
 493         bool rxflow;            /* Is rx flow control on */
 494         bool alp_only;          /* Don't use HT clock (ALP only) */
 495
 496         u8 *ctrl_frame_buf;
 497         u16 ctrl_frame_len;
 498         bool ctrl_frame_stat;
 499         int ctrl_frame_err;
 500
 501         spinlock_t txq_lock;            /* protect bus->txq */
 502         wait_queue_head_t ctrl_wait;
 503         wait_queue_head_t dcmd_resp_wait;
 504
 505         struct timer_list timer;
 506         struct completion watchdog_wait;
 507         struct task_struct *watchdog_tsk;
 508         bool wd_timer_valid;
 509         uint save_ms;
 510
 511         struct workqueue_struct *brcmf_wq;
 512         struct work_struct datawork;
 513         atomic_t dpc_tskcnt;
 514
 515         bool txoff;             /* Transmit flow-controlled */
 516         struct brcmf_sdio_count sdcnt;
 517         bool sr_enabled; /* SaveRestore enabled */
 518
 519         u8 tx_hdrlen;           /* sdio bus header length for tx packet */
 520         bool txglom;            /* host tx glomming enable flag */
 521         u16 head_align;         /* buffer pointer alignment */
 522         u16 sgentry_align;      /* scatter-gather buffer alignment */
 523 };
 524
 525 /* clkstate */
 526 #define CLK_NONE        0
 527 #define CLK_SDONLY      1
 528 #define CLK_PENDING     2
 529 #define CLK_AVAIL       3
 530
 531 #ifdef DEBUG
 532 static int qcount[NUMPRIO];
 533 #endif                          /* DEBUG */
 534
 535 #define DEFAULT_SDIO_DRIVE_STRENGTH     6       /* in milliamps */
 536
 537 #define RETRYCHAN(chan) ((chan) == SDPCM_EVENT_CHANNEL)
 538
 539 /* Retry count for register access failures */
 540 static const uint retry_limit = 2;
 541
 542 /* Limit on rounding up frames */
 543 static const uint max_roundup = 512;
 544
 545 #define ALIGNMENT  4
 546
 547 enum brcmf_sdio_frmtype {
 548         BRCMF_SDIO_FT_NORMAL,
 549         BRCMF_SDIO_FT_SUPER,
 550         BRCMF_SDIO_FT_SUB,
 551 };
 552
 553 #define SDIOD_DRVSTR_KEY(chip, pmu)     (((chip) << 16) | (pmu))
 554
 555 /* SDIO Pad drive strength to select value mappings */
 556 struct sdiod_drive_str {
 557         u8 strength;    /* Pad Drive Strength in mA */
 558         u8 sel;         /* Chip-specific select value */
 559 };
 560
 561 /* SDIO Drive Strength to sel value table for PMU Rev 11 (1.8V) */
 562 static const struct sdiod_drive_str sdiod_drvstr_tab1_1v8[] = {
 563         {32, 0x6},
 564         {26, 0x7},
 565         {22, 0x4},
 566         {16, 0x5},
 567         {12, 0x2},
 568         {8, 0x3},
 569         {4, 0x0},
 570         {0, 0x1}
 571 };
 572
 573 /* SDIO Drive Strength to sel value table for PMU Rev 13 (1.8v) */
 574 static const struct sdiod_drive_str sdiod_drive_strength_tab5_1v8[] = {
 575         {6, 0x7},
 576         {5, 0x6},
 577         {4, 0x5},
 578         {3, 0x4},
 579         {2, 0x2},
 580         {1, 0x1},
 581         {0, 0x0}
 582 };
 583
 584 /* SDIO Drive Strength to sel value table for PMU Rev 17 (1.8v) */
 585 static const struct sdiod_drive_str sdiod_drvstr_tab6_1v8[] = {
 586         {3, 0x3},
 587         {2, 0x2},
 588         {1, 0x1},
 589         {0, 0x0} };
 590
 591 /* SDIO Drive Strength to sel value table for 43143 PMU Rev 17 (3.3V) */
 592 static const struct sdiod_drive_str sdiod_drvstr_tab2_3v3[] = {
 593         {16, 0x7},
 594         {12, 0x5},
 595         {8,  0x3},
 596         {4,  0x1}
 597 };
 598
 599 #define BCM43143_FIRMWARE_NAME          "brcm/brcmfmac43143-sdio.bin"
 600 #define BCM43143_NVRAM_NAME             "brcm/brcmfmac43143-sdio.txt"
 601 #define BCM43241B0_FIRMWARE_NAME        "brcm/brcmfmac43241b0-sdio.bin"
 602 #define BCM43241B0_NVRAM_NAME           "brcm/brcmfmac43241b0-sdio.txt"
 603 #define BCM43241B4_FIRMWARE_NAME        "brcm/brcmfmac43241b4-sdio.bin"
 604 #define BCM43241B4_NVRAM_NAME           "brcm/brcmfmac43241b4-sdio.txt"
 605 #define BCM4329_FIRMWARE_NAME           "brcm/brcmfmac4329-sdio.bin"
 606 #define BCM4329_NVRAM_NAME              "brcm/brcmfmac4329-sdio.txt"
 607 #define BCM4330_FIRMWARE_NAME           "brcm/brcmfmac4330-sdio.bin"
 608 #define BCM4330_NVRAM_NAME              "brcm/brcmfmac4330-sdio.txt"
 609 #define BCM4334_FIRMWARE_NAME           "brcm/brcmfmac4334-sdio.bin"
 610 #define BCM4334_NVRAM_NAME              "brcm/brcmfmac4334-sdio.txt"
 611 #define BCM43340_FIRMWARE_NAME          "brcm/brcmfmac43340-sdio.bin"
 612 #define BCM43340_NVRAM_NAME             "brcm/brcmfmac43340-sdio.txt"
 613 #define BCM4335_FIRMWARE_NAME           "brcm/brcmfmac4335-sdio.bin"
 614 #define BCM4335_NVRAM_NAME              "brcm/brcmfmac4335-sdio.txt"
 615 #define BCM43362_FIRMWARE_NAME          "brcm/brcmfmac43362-sdio.bin"
 616 #define BCM43362_NVRAM_NAME             "brcm/brcmfmac43362-sdio.txt"
 617 #define BCM4339_FIRMWARE_NAME           "brcm/brcmfmac4339-sdio.bin"
 618 #define BCM4339_NVRAM_NAME              "brcm/brcmfmac4339-sdio.txt"
 619 #define BCM4354_FIRMWARE_NAME           "brcm/brcmfmac4354-sdio.bin"
 620 #define BCM4354_NVRAM_NAME              "brcm/brcmfmac4354-sdio.txt"
 621
 622 MODULE_FIRMWARE(BCM43143_FIRMWARE_NAME);
 623 MODULE_FIRMWARE(BCM43143_NVRAM_NAME);
 624 MODULE_FIRMWARE(BCM43241B0_FIRMWARE_NAME);
 625 MODULE_FIRMWARE(BCM43241B0_NVRAM_NAME);
 626 MODULE_FIRMWARE(BCM43241B4_FIRMWARE_NAME);
 627 MODULE_FIRMWARE(BCM43241B4_NVRAM_NAME);
 628 MODULE_FIRMWARE(BCM4329_FIRMWARE_NAME);
 629 MODULE_FIRMWARE(BCM4329_NVRAM_NAME);
 630 MODULE_FIRMWARE(BCM4330_FIRMWARE_NAME);
 631 MODULE_FIRMWARE(BCM4330_NVRAM_NAME);
 632 MODULE_FIRMWARE(BCM4334_FIRMWARE_NAME);
 633 MODULE_FIRMWARE(BCM4334_NVRAM_NAME);
 634 MODULE_FIRMWARE(BCM43340_FIRMWARE_NAME);
 635 MODULE_FIRMWARE(BCM43340_NVRAM_NAME);
 636 MODULE_FIRMWARE(BCM4335_FIRMWARE_NAME);
 637 MODULE_FIRMWARE(BCM4335_NVRAM_NAME);
 638 MODULE_FIRMWARE(BCM43362_FIRMWARE_NAME);
 639 MODULE_FIRMWARE(BCM43362_NVRAM_NAME);
 640 MODULE_FIRMWARE(BCM4339_FIRMWARE_NAME);
 641 MODULE_FIRMWARE(BCM4339_NVRAM_NAME);
 642 MODULE_FIRMWARE(BCM4354_FIRMWARE_NAME);
 643 MODULE_FIRMWARE(BCM4354_NVRAM_NAME);
 644
 645 struct brcmf_firmware_names {
 646         u32 chipid;
 647         u32 revmsk;
 648         const char *bin;
 649         const char *nv;
 650 };
 651
 652 enum brcmf_firmware_type {
 653         BRCMF_FIRMWARE_BIN,
 654         BRCMF_FIRMWARE_NVRAM
 655 };
 656
 657 #define BRCMF_FIRMWARE_NVRAM(name) \
 658         name ## _FIRMWARE_NAME, name ## _NVRAM_NAME
 659
 660 static const struct brcmf_firmware_names brcmf_fwname_data[] = {
 661         { BRCM_CC_43143_CHIP_ID, 0xFFFFFFFF, BRCMF_FIRMWARE_NVRAM(BCM43143) },
 662         { BRCM_CC_43241_CHIP_ID, 0x0000001F, BRCMF_FIRMWARE_NVRAM(BCM43241B0) },
 663         { BRCM_CC_43241_CHIP_ID, 0xFFFFFFE0, BRCMF_FIRMWARE_NVRAM(BCM43241B4) },
 664         { BRCM_CC_4329_CHIP_ID, 0xFFFFFFFF, BRCMF_FIRMWARE_NVRAM(BCM4329) },
 665         { BRCM_CC_4330_CHIP_ID, 0xFFFFFFFF, BRCMF_FIRMWARE_NVRAM(BCM4330) },
 666         { BRCM_CC_4334_CHIP_ID, 0xFFFFFFFF, BRCMF_FIRMWARE_NVRAM(BCM4334) },
 667         { BRCM_CC_43340_CHIP_ID, 0xFFFFFFFF, BRCMF_FIRMWARE_NVRAM(BCM43340) },
 668         { BRCM_CC_4335_CHIP_ID, 0xFFFFFFFF, BRCMF_FIRMWARE_NVRAM(BCM4335) },
 669         { BRCM_CC_43362_CHIP_ID, 0xFFFFFFFE, BRCMF_FIRMWARE_NVRAM(BCM43362) },
 670         { BRCM_CC_4339_CHIP_ID, 0xFFFFFFFF, BRCMF_FIRMWARE_NVRAM(BCM4339) },
 671         { BRCM_CC_4354_CHIP_ID, 0xFFFFFFFF, BRCMF_FIRMWARE_NVRAM(BCM4354) }
 672 };
 673
 674 static int brcmf_sdio_get_fwnames(struct brcmf_chip *ci,
 675                                   struct brcmf_sdio_dev *sdiodev)
 676 {
 677         int i;
 678         char end;
 679
 680         for (i = 0; i < ARRAY_SIZE(brcmf_fwname_data); i++) {
 681                 if (brcmf_fwname_data[i].chipid == ci->chip &&
 682                     brcmf_fwname_data[i].revmsk & BIT(ci->chiprev))
 683                         break;
 684         }
 685
 686         if (i == ARRAY_SIZE(brcmf_fwname_data)) {
 687                 brcmf_err("Unknown chipid %d [%d]\n", ci->chip, ci->chiprev);
 688                 return -ENODEV;
 689         }
 690
 691         /* check if firmware path is provided by module parameter */
 692         if (brcmf_firmware_path[0] != '\0') {
 693                 strlcpy(sdiodev->fw_name, brcmf_firmware_path,
 694                         sizeof(sdiodev->fw_name));
 695                 strlcpy(sdiodev->nvram_name, brcmf_firmware_path,
 696                         sizeof(sdiodev->nvram_name));
 697
 698                 end = brcmf_firmware_path[strlen(brcmf_firmware_path) - 1];
 699                 if (end != '/') {
 700                         strlcat(sdiodev->fw_name, "/",
 701                                 sizeof(sdiodev->fw_name));
 702                         strlcat(sdiodev->nvram_name, "/",
 703                                 sizeof(sdiodev->nvram_name));
 704                 }
 705         }
 706         strlcat(sdiodev->fw_name, brcmf_fwname_data[i].bin,
 707                 sizeof(sdiodev->fw_name));
 708         strlcat(sdiodev->nvram_name, brcmf_fwname_data[i].nv,
 709                 sizeof(sdiodev->nvram_name));
 710
 711         return 0;
 712 }
 713
 714 static void pkt_align(struct sk_buff *p, int len, int align)
 715 {
 716         uint datalign;
 717         datalign = (unsigned long)(p->data);
 718         datalign = roundup(datalign, (align)) - datalign;
 719         if (datalign)
 720                 skb_pull(p, datalign);
 721         __skb_trim(p, len);
 722 }
 723
 724 /* To check if there's window offered */
 725 static bool data_ok(struct brcmf_sdio *bus)
 726 {
 727         return (u8)(bus->tx_max - bus->tx_seq) != 0 &&
 728                ((u8)(bus->tx_max - bus->tx_seq) & 0x80) == 0;
 729 }
 730
 731 /*
 732  * Reads a register in the SDIO hardware block. This block occupies a series of
 733  * adresses on the 32 bit backplane bus.
 734  */
 735 static int r_sdreg32(struct brcmf_sdio *bus, u32 *regvar, u32 offset)
 736 {
 737         struct brcmf_core *core;
 738         int ret;
 739
 740         core = brcmf_chip_get_core(bus->ci, BCMA_CORE_SDIO_DEV);
 741         *regvar = brcmf_sdiod_regrl(bus->sdiodev, core->base + offset, &ret);
 742
 743         return ret;
 744 }
 745
 746 static int w_sdreg32(struct brcmf_sdio *bus, u32 regval, u32 reg_offset)
 747 {
 748         struct brcmf_core *core;
 749         int ret;
 750
 751         core = brcmf_chip_get_core(bus->ci, BCMA_CORE_SDIO_DEV);
 752         brcmf_sdiod_regwl(bus->sdiodev, core->base + reg_offset, regval, &ret);
 753
 754         return ret;
 755 }
 756
 757 static int
 758 brcmf_sdio_kso_control(struct brcmf_sdio *bus, bool on)
 759 {
 760         u8 wr_val = 0, rd_val, cmp_val, bmask;
 761         int err = 0;
 762         int try_cnt = 0;
 763
 764         brcmf_dbg(TRACE, "Enter: on=%d\n", on);
 765
 766         wr_val = (on << SBSDIO_FUNC1_SLEEPCSR_KSO_SHIFT);
 767         /* 1st KSO write goes to AOS wake up core if device is asleep  */
 768         brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR,
 769                           wr_val, &err);
 770
 771         if (on) {
 772                 /* device WAKEUP through KSO:
 773                  * write bit 0 & read back until
 774                  * both bits 0 (kso bit) & 1 (dev on status) are set
 775                  */
 776                 cmp_val = SBSDIO_FUNC1_SLEEPCSR_KSO_MASK |
 777                           SBSDIO_FUNC1_SLEEPCSR_DEVON_MASK;
 778                 bmask = cmp_val;
 779                 usleep_range(2000, 3000);
 780         } else {
 781                 /* Put device to sleep, turn off KSO */
 782                 cmp_val = 0;
 783                 /* only check for bit0, bit1(dev on status) may not
 784                  * get cleared right away
 785                  */
 786                 bmask = SBSDIO_FUNC1_SLEEPCSR_KSO_MASK;
 787         }
 788
 789         do {
 790                 /* reliable KSO bit set/clr:
 791                  * the sdiod sleep write access is synced to PMU 32khz clk
 792                  * just one write attempt may fail,
 793                  * read it back until it matches written value
 794                  */
 795                 rd_val = brcmf_sdiod_regrb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR,
 796                                            &err);
 797                 if (((rd_val & bmask) == cmp_val) && !err)
 798                         break;
 799
 800                 udelay(KSO_WAIT_US);
 801                 brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR,
 802                                   wr_val, &err);
 803         } while (try_cnt++ < MAX_KSO_ATTEMPTS);
 804
 805         if (try_cnt > 2)
 806                 brcmf_dbg(SDIO, "try_cnt=%d rd_val=0x%x err=%d\n", try_cnt,
 807                           rd_val, err);
 808
 809         if (try_cnt > MAX_KSO_ATTEMPTS)
 810                 brcmf_err("max tries: rd_val=0x%x err=%d\n", rd_val, err);
 811
 812         return err;
 813 }
 814
 815 #define HOSTINTMASK             (I_HMB_SW_MASK | I_CHIPACTIVE)
 816
 817 /* Turn backplane clock on or off */
 818 static int brcmf_sdio_htclk(struct brcmf_sdio *bus, bool on, bool pendok)
 819 {
 820         int err;
 821         u8 clkctl, clkreq, devctl;
 822         unsigned long timeout;
 823
 824         brcmf_dbg(SDIO, "Enter\n");
 825
 826         clkctl = 0;
 827
 828         if (bus->sr_enabled) {
 829                 bus->clkstate = (on ? CLK_AVAIL : CLK_SDONLY);
 830                 return 0;
 831         }
 832
 833         if (on) {
 834                 /* Request HT Avail */
 835                 clkreq =
 836                     bus->alp_only ? SBSDIO_ALP_AVAIL_REQ : SBSDIO_HT_AVAIL_REQ;
 837
 838                 brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
 839                                   clkreq, &err);
 840                 if (err) {
 841                         brcmf_err("HT Avail request error: %d\n", err);
 842                         return -EBADE;
 843                 }
 844
 845                 /* Check current status */
 846                 clkctl = brcmf_sdiod_regrb(bus->sdiodev,
 847                                            SBSDIO_FUNC1_CHIPCLKCSR, &err);
 848                 if (err) {
 849                         brcmf_err("HT Avail read error: %d\n", err);
 850                         return -EBADE;
 851                 }
 852
 853                 /* Go to pending and await interrupt if appropriate */
 854                 if (!SBSDIO_CLKAV(clkctl, bus->alp_only) && pendok) {
 855                         /* Allow only clock-available interrupt */
 856                         devctl = brcmf_sdiod_regrb(bus->sdiodev,
 857                                                    SBSDIO_DEVICE_CTL, &err);
 858                         if (err) {
 859                                 brcmf_err("Devctl error setting CA: %d\n",
 860                                           err);
 861                                 return -EBADE;
 862                         }
 863
 864                         devctl |= SBSDIO_DEVCTL_CA_INT_ONLY;
 865                         brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
 866                                           devctl, &err);
 867                         brcmf_dbg(SDIO, "CLKCTL: set PENDING\n");
 868                         bus->clkstate = CLK_PENDING;
 869
 870                         return 0;
 871                 } else if (bus->clkstate == CLK_PENDING) {
 872                         /* Cancel CA-only interrupt filter */
 873                         devctl = brcmf_sdiod_regrb(bus->sdiodev,
 874                                                    SBSDIO_DEVICE_CTL, &err);
 875                         devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
 876                         brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
 877                                           devctl, &err);
 878                 }
 879
 880                 /* Otherwise, wait here (polling) for HT Avail */
 881                 timeout = jiffies +
 882                           msecs_to_jiffies(PMU_MAX_TRANSITION_DLY/1000);
 883                 while (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
 884                         clkctl = brcmf_sdiod_regrb(bus->sdiodev,
 885                                                    SBSDIO_FUNC1_CHIPCLKCSR,
 886                                                    &err);
 887                         if (time_after(jiffies, timeout))
 888                                 break;
 889                         else
 890                                 usleep_range(5000, 10000);
 891                 }
 892                 if (err) {
 893                         brcmf_err("HT Avail request error: %d\n", err);
 894                         return -EBADE;
 895                 }
 896                 if (!SBSDIO_CLKAV(clkctl, bus->alp_only)) {
 897                         brcmf_err("HT Avail timeout (%d): clkctl 0x%02x\n",
 898                                   PMU_MAX_TRANSITION_DLY, clkctl);
 899                         return -EBADE;
 900                 }
 901
 902                 /* Mark clock available */
 903                 bus->clkstate = CLK_AVAIL;
 904                 brcmf_dbg(SDIO, "CLKCTL: turned ON\n");
 905
 906 #if defined(DEBUG)
 907                 if (!bus->alp_only) {
 908                         if (SBSDIO_ALPONLY(clkctl))
 909                                 brcmf_err("HT Clock should be on\n");
 910                 }
 911 #endif                          /* defined (DEBUG) */
 912
 913         } else {
 914                 clkreq = 0;
 915
 916                 if (bus->clkstate == CLK_PENDING) {
 917                         /* Cancel CA-only interrupt filter */
 918                         devctl = brcmf_sdiod_regrb(bus->sdiodev,
 919                                                    SBSDIO_DEVICE_CTL, &err);
 920                         devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
 921                         brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
 922                                           devctl, &err);
 923                 }
 924
 925                 bus->clkstate = CLK_SDONLY;
 926                 brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
 927                                   clkreq, &err);
 928                 brcmf_dbg(SDIO, "CLKCTL: turned OFF\n");
 929                 if (err) {
 930                         brcmf_err("Failed access turning clock off: %d\n",
 931                                   err);
 932                         return -EBADE;
 933                 }
 934         }
 935         return 0;
 936 }
 937
 938 /* Change idle/active SD state */
 939 static int brcmf_sdio_sdclk(struct brcmf_sdio *bus, bool on)
 940 {
 941         brcmf_dbg(SDIO, "Enter\n");
 942
 943         if (on)
 944                 bus->clkstate = CLK_SDONLY;
 945         else
 946                 bus->clkstate = CLK_NONE;
 947
 948         return 0;
 949 }
 950
 951 /* Transition SD and backplane clock readiness */
 952 static int brcmf_sdio_clkctl(struct brcmf_sdio *bus, uint target, bool pendok)
 953 {
 954 #ifdef DEBUG
 955         uint oldstate = bus->clkstate;
 956 #endif                          /* DEBUG */
 957
 958         brcmf_dbg(SDIO, "Enter\n");
 959
 960         /* Early exit if we're already there */
 961         if (bus->clkstate == target) {
 962                 if (target == CLK_AVAIL) {
 963                         brcmf_sdio_wd_timer(bus, BRCMF_WD_POLL_MS);
 964                         bus->activity = true;
 965                 }
 966                 return 0;
 967         }
 968
 969         switch (target) {
 970         case CLK_AVAIL:
 971                 /* Make sure SD clock is available */
 972                 if (bus->clkstate == CLK_NONE)
 973                         brcmf_sdio_sdclk(bus, true);
 974                 /* Now request HT Avail on the backplane */
 975                 brcmf_sdio_htclk(bus, true, pendok);
 976                 brcmf_sdio_wd_timer(bus, BRCMF_WD_POLL_MS);
 977                 bus->activity = true;
 978                 break;
 979
 980         case CLK_SDONLY:
 981                 /* Remove HT request, or bring up SD clock */
 982                 if (bus->clkstate == CLK_NONE)
 983                         brcmf_sdio_sdclk(bus, true);
 984                 else if (bus->clkstate == CLK_AVAIL)
 985                         brcmf_sdio_htclk(bus, false, false);
 986                 else
 987                         brcmf_err("request for %d -> %d\n",
 988                                   bus->clkstate, target);
 989                 brcmf_sdio_wd_timer(bus, BRCMF_WD_POLL_MS);
 990                 break;
 991
 992         case CLK_NONE:
 993                 /* Make sure to remove HT request */
 994                 if (bus->clkstate == CLK_AVAIL)
 995                         brcmf_sdio_htclk(bus, false, false);
 996                 /* Now remove the SD clock */
 997                 brcmf_sdio_sdclk(bus, false);
 998                 brcmf_sdio_wd_timer(bus, 0);
 999                 break;
1000         }
1001 #ifdef DEBUG
1002         brcmf_dbg(SDIO, "%d -> %d\n", oldstate, bus->clkstate);
1003 #endif                          /* DEBUG */
1004
1005         return 0;
1006 }
1007
1008 static int
1009 brcmf_sdio_bus_sleep(struct brcmf_sdio *bus, bool sleep, bool pendok)
1010 {
1011         int err = 0;
1012         u8 clkcsr;
1013
1014         brcmf_dbg(SDIO, "Enter: request %s currently %s\n",
1015                   (sleep ? "SLEEP" : "WAKE"),
1016                   (bus->sdiodev->sleeping ? "SLEEP" : "WAKE"));
1017
1018         /* If SR is enabled control bus state with KSO */
1019         if (bus->sr_enabled) {
1020                 /* Done if we're already in the requested state */
1021                 if (sleep == bus->sdiodev->sleeping)
1022                         goto end;
1023
1024                 /* Going to sleep */
1025                 if (sleep) {
1026                         /* Don't sleep if something is pending */
1027                         if (atomic_read(&bus->intstatus) ||
1028                             atomic_read(&bus->ipend) > 0 ||
1029                             (!atomic_read(&bus->fcstate) &&
1030                             brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol) &&
1031                             data_ok(bus))) {
1032                                  err = -EBUSY;
1033                                  goto done;
1034                         }
1035
1036                         clkcsr = brcmf_sdiod_regrb(bus->sdiodev,
1037                                                    SBSDIO_FUNC1_CHIPCLKCSR,
1038                                                    &err);
1039                         if ((clkcsr & SBSDIO_CSR_MASK) == 0) {
1040                                 brcmf_dbg(SDIO, "no clock, set ALP\n");
1041                                 brcmf_sdiod_regwb(bus->sdiodev,
1042                                                   SBSDIO_FUNC1_CHIPCLKCSR,
1043                                                   SBSDIO_ALP_AVAIL_REQ, &err);
1044                         }
1045                         err = brcmf_sdio_kso_control(bus, false);
1046                         /* disable watchdog */
1047                         if (!err)
1048                                 brcmf_sdio_wd_timer(bus, 0);
1049                 } else {
1050                         bus->idlecount = 0;
1051                         err = brcmf_sdio_kso_control(bus, true);
1052                 }
1053                 if (err) {
1054                         brcmf_err("error while changing bus sleep state %d\n",
1055                                   err);
1056                         goto done;
1057                 }
1058         }
1059
1060 end:
1061         /* control clocks */
1062         if (sleep) {
1063                 if (!bus->sr_enabled)
1064                         brcmf_sdio_clkctl(bus, CLK_NONE, pendok);
1065         } else {
1066                 brcmf_sdio_clkctl(bus, CLK_AVAIL, pendok);
1067         }
1068         bus->sdiodev->sleeping = sleep;
1069         if (sleep)
1070                 wake_up(&bus->sdiodev->idle_wait);
1071         brcmf_dbg(SDIO, "new state %s\n",
1072                   (sleep ? "SLEEP" : "WAKE"));
1073 done:
1074         brcmf_dbg(SDIO, "Exit: err=%d\n", err);
1075         return err;
1076
1077 }
1078
1079 #ifdef DEBUG
1080 static inline bool brcmf_sdio_valid_shared_address(u32 addr)
1081 {
1082         return !(addr == 0 || ((~addr >> 16) & 0xffff) == (addr & 0xffff));
1083 }
1084
1085 static int brcmf_sdio_readshared(struct brcmf_sdio *bus,
1086                                  struct sdpcm_shared *sh)
1087 {
1088         u32 addr;
1089         int rv;
1090         u32 shaddr = 0;
1091         struct sdpcm_shared_le sh_le;
1092         __le32 addr_le;
1093
1094         shaddr = bus->ci->rambase + bus->ramsize - 4;
1095
1096         /*
1097          * Read last word in socram to determine
1098          * address of sdpcm_shared structure
1099          */
1100         sdio_claim_host(bus->sdiodev->func[1]);
1101         brcmf_sdio_bus_sleep(bus, false, false);
1102         rv = brcmf_sdiod_ramrw(bus->sdiodev, false, shaddr, (u8 *)&addr_le, 4);
1103         sdio_release_host(bus->sdiodev->func[1]);
1104         if (rv < 0)
1105                 return rv;
1106
1107         addr = le32_to_cpu(addr_le);
1108
1109         brcmf_dbg(SDIO, "sdpcm_shared address 0x%08X\n", addr);
1110
1111         /*
1112          * Check if addr is valid.
1113          * NVRAM length at the end of memory should have been overwritten.
1114          */
1115         if (!brcmf_sdio_valid_shared_address(addr)) {
1116                         brcmf_err("invalid sdpcm_shared address 0x%08X\n",
1117                                   addr);
1118                         return -EINVAL;
1119         }
1120
1121         /* Read hndrte_shared structure */
1122         rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr, (u8 *)&sh_le,
1123                                sizeof(struct sdpcm_shared_le));
1124         if (rv < 0)
1125                 return rv;
1126
1127         /* Endianness */
1128         sh->flags = le32_to_cpu(sh_le.flags);
1129         sh->trap_addr = le32_to_cpu(sh_le.trap_addr);
1130         sh->assert_exp_addr = le32_to_cpu(sh_le.assert_exp_addr);
1131         sh->assert_file_addr = le32_to_cpu(sh_le.assert_file_addr);
1132         sh->assert_line = le32_to_cpu(sh_le.assert_line);
1133         sh->console_addr = le32_to_cpu(sh_le.console_addr);
1134         sh->msgtrace_addr = le32_to_cpu(sh_le.msgtrace_addr);
1135
1136         if ((sh->flags & SDPCM_SHARED_VERSION_MASK) > SDPCM_SHARED_VERSION) {
1137                 brcmf_err("sdpcm shared version unsupported: dhd %d dongle %d\n",
1138                           SDPCM_SHARED_VERSION,
1139                           sh->flags & SDPCM_SHARED_VERSION_MASK);
1140                 return -EPROTO;
1141         }
1142
1143         return 0;
1144 }
1145
1146 static void brcmf_sdio_get_console_addr(struct brcmf_sdio *bus)
1147 {
1148         struct sdpcm_shared sh;
1149
1150         if (brcmf_sdio_readshared(bus, &sh) == 0)
1151                 bus->console_addr = sh.console_addr;
1152 }
1153 #else
1154 static void brcmf_sdio_get_console_addr(struct brcmf_sdio *bus)
1155 {
1156 }
1157 #endif /* DEBUG */
1158
1159 static u32 brcmf_sdio_hostmail(struct brcmf_sdio *bus)
1160 {
1161         u32 intstatus = 0;
1162         u32 hmb_data;
1163         u8 fcbits;
1164         int ret;
1165
1166         brcmf_dbg(SDIO, "Enter\n");
1167
1168         /* Read mailbox data and ack that we did so */
1169         ret = r_sdreg32(bus, &hmb_data,
1170                         offsetof(struct sdpcmd_regs, tohostmailboxdata));
1171
1172         if (ret == 0)
1173                 w_sdreg32(bus, SMB_INT_ACK,
1174                           offsetof(struct sdpcmd_regs, tosbmailbox));
1175         bus->sdcnt.f1regdata += 2;
1176
1177         /* Dongle recomposed rx frames, accept them again */
1178         if (hmb_data & HMB_DATA_NAKHANDLED) {
1179                 brcmf_dbg(SDIO, "Dongle reports NAK handled, expect rtx of %d\n",
1180                           bus->rx_seq);
1181                 if (!bus->rxskip)
1182                         brcmf_err("unexpected NAKHANDLED!\n");
1183
1184                 bus->rxskip = false;
1185                 intstatus |= I_HMB_FRAME_IND;
1186         }
1187
1188         /*
1189          * DEVREADY does not occur with gSPI.
1190          */
1191         if (hmb_data & (HMB_DATA_DEVREADY | HMB_DATA_FWREADY)) {
1192                 bus->sdpcm_ver =
1193                     (hmb_data & HMB_DATA_VERSION_MASK) >>
1194                     HMB_DATA_VERSION_SHIFT;
1195                 if (bus->sdpcm_ver != SDPCM_PROT_VERSION)
1196                         brcmf_err("Version mismatch, dongle reports %d, "
1197                                   "expecting %d\n",
1198                                   bus->sdpcm_ver, SDPCM_PROT_VERSION);
1199                 else
1200                         brcmf_dbg(SDIO, "Dongle ready, protocol version %d\n",
1201                                   bus->sdpcm_ver);
1202
1203                 /*
1204                  * Retrieve console state address now that firmware should have
1205                  * updated it.
1206                  */
1207                 brcmf_sdio_get_console_addr(bus);
1208         }
1209
1210         /*
1211          * Flow Control has been moved into the RX headers and this out of band
1212          * method isn't used any more.
1213          * remaining backward compatible with older dongles.
1214          */
1215         if (hmb_data & HMB_DATA_FC) {
1216                 fcbits = (hmb_data & HMB_DATA_FCDATA_MASK) >>
1217                                                         HMB_DATA_FCDATA_SHIFT;
1218
1219                 if (fcbits & ~bus->flowcontrol)
1220                         bus->sdcnt.fc_xoff++;
1221
1222                 if (bus->flowcontrol & ~fcbits)
1223                         bus->sdcnt.fc_xon++;
1224
1225                 bus->sdcnt.fc_rcvd++;
1226                 bus->flowcontrol = fcbits;
1227         }
1228
1229         /* Shouldn't be any others */
1230         if (hmb_data & ~(HMB_DATA_DEVREADY |
1231                          HMB_DATA_NAKHANDLED |
1232                          HMB_DATA_FC |
1233                          HMB_DATA_FWREADY |
1234                          HMB_DATA_FCDATA_MASK | HMB_DATA_VERSION_MASK))
1235                 brcmf_err("Unknown mailbox data content: 0x%02x\n",
1236                           hmb_data);
1237
1238         return intstatus;
1239 }
1240
1241 static void brcmf_sdio_rxfail(struct brcmf_sdio *bus, bool abort, bool rtx)
1242 {
1243         uint retries = 0;
1244         u16 lastrbc;
1245         u8 hi, lo;
1246         int err;
1247
1248         brcmf_err("%sterminate frame%s\n",
1249                   abort ? "abort command, " : "",
1250                   rtx ? ", send NAK" : "");
1251
1252         if (abort)
1253                 brcmf_sdiod_abort(bus->sdiodev, SDIO_FUNC_2);
1254
1255         brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_FRAMECTRL,
1256                           SFC_RF_TERM, &err);
1257         bus->sdcnt.f1regdata++;
1258
1259         /* Wait until the packet has been flushed (device/FIFO stable) */
1260         for (lastrbc = retries = 0xffff; retries > 0; retries--) {
1261                 hi = brcmf_sdiod_regrb(bus->sdiodev,
1262                                        SBSDIO_FUNC1_RFRAMEBCHI, &err);
1263                 lo = brcmf_sdiod_regrb(bus->sdiodev,
1264                                        SBSDIO_FUNC1_RFRAMEBCLO, &err);
1265                 bus->sdcnt.f1regdata += 2;
1266
1267                 if ((hi == 0) && (lo == 0))
1268                         break;
1269
1270                 if ((hi > (lastrbc >> 8)) && (lo > (lastrbc & 0x00ff))) {
1271                         brcmf_err("count growing: last 0x%04x now 0x%04x\n",
1272                                   lastrbc, (hi << 8) + lo);
1273                 }
1274                 lastrbc = (hi << 8) + lo;
1275         }
1276
1277         if (!retries)
1278                 brcmf_err("count never zeroed: last 0x%04x\n", lastrbc);
1279         else
1280                 brcmf_dbg(SDIO, "flush took %d iterations\n", 0xffff - retries);
1281
1282         if (rtx) {
1283                 bus->sdcnt.rxrtx++;
1284                 err = w_sdreg32(bus, SMB_NAK,
1285                                 offsetof(struct sdpcmd_regs, tosbmailbox));
1286
1287                 bus->sdcnt.f1regdata++;
1288                 if (err == 0)
1289                         bus->rxskip = true;
1290         }
1291
1292         /* Clear partial in any case */
1293         bus->cur_read.len = 0;
1294 }
1295
1296 static void brcmf_sdio_txfail(struct brcmf_sdio *bus)
1297 {
1298         struct brcmf_sdio_dev *sdiodev = bus->sdiodev;
1299         u8 i, hi, lo;
1300
1301         /* On failure, abort the command and terminate the frame */
1302         brcmf_err("sdio error, abort command and terminate frame\n");
1303         bus->sdcnt.tx_sderrs++;
1304
1305         brcmf_sdiod_abort(sdiodev, SDIO_FUNC_2);
1306         brcmf_sdiod_regwb(sdiodev, SBSDIO_FUNC1_FRAMECTRL, SFC_WF_TERM, NULL);
1307         bus->sdcnt.f1regdata++;
1308
1309         for (i = 0; i < 3; i++) {
1310                 hi = brcmf_sdiod_regrb(sdiodev, SBSDIO_FUNC1_WFRAMEBCHI, NULL);
1311                 lo = brcmf_sdiod_regrb(sdiodev, SBSDIO_FUNC1_WFRAMEBCLO, NULL);
1312                 bus->sdcnt.f1regdata += 2;
1313                 if ((hi == 0) && (lo == 0))
1314                         break;
1315         }
1316 }
1317
1318 /* return total length of buffer chain */
1319 static uint brcmf_sdio_glom_len(struct brcmf_sdio *bus)
1320 {
1321         struct sk_buff *p;
1322         uint total;
1323
1324         total = 0;
1325         skb_queue_walk(&bus->glom, p)
1326                 total += p->len;
1327         return total;
1328 }
1329
1330 static void brcmf_sdio_free_glom(struct brcmf_sdio *bus)
1331 {
1332         struct sk_buff *cur, *next;
1333
1334         skb_queue_walk_safe(&bus->glom, cur, next) {
1335                 skb_unlink(cur, &bus->glom);
1336                 brcmu_pkt_buf_free_skb(cur);
1337         }
1338 }
1339
1340 /**
1341  * brcmfmac sdio bus specific header
1342  * This is the lowest layer header wrapped on the packets transmitted between
1343  * host and WiFi dongle which contains information needed for SDIO core and
1344  * firmware
1345  *
1346  * It consists of 3 parts: hardware header, hardware extension header and
1347  * software header
1348  * hardware header (frame tag) - 4 bytes
1349  * Byte 0~1: Frame length
1350  * Byte 2~3: Checksum, bit-wise inverse of frame length
1351  * hardware extension header - 8 bytes
1352  * Tx glom mode only, N/A for Rx or normal Tx
1353  * Byte 0~1: Packet length excluding hw frame tag
1354  * Byte 2: Reserved
1355  * Byte 3: Frame flags, bit 0: last frame indication
1356  * Byte 4~5: Reserved
1357  * Byte 6~7: Tail padding length
1358  * software header - 8 bytes
1359  * Byte 0: Rx/Tx sequence number
1360  * Byte 1: 4 MSB Channel number, 4 LSB arbitrary flag
1361  * Byte 2: Length of next data frame, reserved for Tx
1362  * Byte 3: Data offset
1363  * Byte 4: Flow control bits, reserved for Tx
1364  * Byte 5: Maximum Sequence number allowed by firmware for Tx, N/A for Tx packet
1365  * Byte 6~7: Reserved
1366  */
1367 #define SDPCM_HWHDR_LEN                 4
1368 #define SDPCM_HWEXT_LEN                 8
1369 #define SDPCM_SWHDR_LEN                 8
1370 #define SDPCM_HDRLEN                    (SDPCM_HWHDR_LEN + SDPCM_SWHDR_LEN)
1371 /* software header */
1372 #define SDPCM_SEQ_MASK                  0x000000ff
1373 #define SDPCM_SEQ_WRAP                  256
1374 #define SDPCM_CHANNEL_MASK              0x00000f00
1375 #define SDPCM_CHANNEL_SHIFT             8
1376 #define SDPCM_CONTROL_CHANNEL           0       /* Control */
1377 #define SDPCM_EVENT_CHANNEL             1       /* Asyc Event Indication */
1378 #define SDPCM_DATA_CHANNEL              2       /* Data Xmit/Recv */
1379 #define SDPCM_GLOM_CHANNEL              3       /* Coalesced packets */
1380 #define SDPCM_TEST_CHANNEL              15      /* Test/debug packets */
1381 #define SDPCM_GLOMDESC(p)               (((u8 *)p)[1] & 0x80)
1382 #define SDPCM_NEXTLEN_MASK              0x00ff0000
1383 #define SDPCM_NEXTLEN_SHIFT             16
1384 #define SDPCM_DOFFSET_MASK              0xff000000
1385 #define SDPCM_DOFFSET_SHIFT             24
1386 #define SDPCM_FCMASK_MASK               0x000000ff
1387 #define SDPCM_WINDOW_MASK               0x0000ff00
1388 #define SDPCM_WINDOW_SHIFT              8
1389
1390 static inline u8 brcmf_sdio_getdatoffset(u8 *swheader)
1391 {
1392         u32 hdrvalue;
1393         hdrvalue = *(u32 *)swheader;
1394         return (u8)((hdrvalue & SDPCM_DOFFSET_MASK) >> SDPCM_DOFFSET_SHIFT);
1395 }
1396
1397 static int brcmf_sdio_hdparse(struct brcmf_sdio *bus, u8 *header,
1398                               struct brcmf_sdio_hdrinfo *rd,
1399                               enum brcmf_sdio_frmtype type)
1400 {
1401         u16 len, checksum;
1402         u8 rx_seq, fc, tx_seq_max;
1403         u32 swheader;
1404
1405         trace_brcmf_sdpcm_hdr(SDPCM_RX, header);
1406
1407         /* hw header */
1408         len = get_unaligned_le16(header);
1409         checksum = get_unaligned_le16(header + sizeof(u16));
1410         /* All zero means no more to read */
1411         if (!(len | checksum)) {
1412                 bus->rxpending = false;
1413                 return -ENODATA;
1414         }
1415         if ((u16)(~(len ^ checksum))) {
1416                 brcmf_err("HW header checksum error\n");
1417                 bus->sdcnt.rx_badhdr++;
1418                 brcmf_sdio_rxfail(bus, false, false);
1419                 return -EIO;
1420         }
1421         if (len < SDPCM_HDRLEN) {
1422                 brcmf_err("HW header length error\n");
1423                 return -EPROTO;
1424         }
1425         if (type == BRCMF_SDIO_FT_SUPER &&
1426             (roundup(len, bus->blocksize) != rd->len)) {
1427                 brcmf_err("HW superframe header length error\n");
1428                 return -EPROTO;
1429         }
1430         if (type == BRCMF_SDIO_FT_SUB && len > rd->len) {
1431                 brcmf_err("HW subframe header length error\n");
1432                 return -EPROTO;
1433         }
1434         rd->len = len;
1435
1436         /* software header */
1437         header += SDPCM_HWHDR_LEN;
1438         swheader = le32_to_cpu(*(__le32 *)header);
1439         if (type == BRCMF_SDIO_FT_SUPER && SDPCM_GLOMDESC(header)) {
1440                 brcmf_err("Glom descriptor found in superframe head\n");
1441                 rd->len = 0;
1442                 return -EINVAL;
1443         }
1444         rx_seq = (u8)(swheader & SDPCM_SEQ_MASK);
1445         rd->channel = (swheader & SDPCM_CHANNEL_MASK) >> SDPCM_CHANNEL_SHIFT;
1446         if (len > MAX_RX_DATASZ && rd->channel != SDPCM_CONTROL_CHANNEL &&
1447             type != BRCMF_SDIO_FT_SUPER) {
1448                 brcmf_err("HW header length too long\n");
1449                 bus->sdcnt.rx_toolong++;
1450                 brcmf_sdio_rxfail(bus, false, false);
1451                 rd->len = 0;
1452                 return -EPROTO;
1453         }
1454         if (type == BRCMF_SDIO_FT_SUPER && rd->channel != SDPCM_GLOM_CHANNEL) {
1455                 brcmf_err("Wrong channel for superframe\n");
1456                 rd->len = 0;
1457                 return -EINVAL;
1458         }
1459         if (type == BRCMF_SDIO_FT_SUB && rd->channel != SDPCM_DATA_CHANNEL &&
1460             rd->channel != SDPCM_EVENT_CHANNEL) {
1461                 brcmf_err("Wrong channel for subframe\n");
1462                 rd->len = 0;
1463                 return -EINVAL;
1464         }
1465         rd->dat_offset = brcmf_sdio_getdatoffset(header);
1466         if (rd->dat_offset < SDPCM_HDRLEN || rd->dat_offset > rd->len) {
1467                 brcmf_err("seq %d: bad data offset\n", rx_seq);
1468                 bus->sdcnt.rx_badhdr++;
1469                 brcmf_sdio_rxfail(bus, false, false);
1470                 rd->len = 0;
1471                 return -ENXIO;
1472         }
1473         if (rd->seq_num != rx_seq) {
1474                 brcmf_err("seq %d: sequence number error, expect %d\n",
1475                           rx_seq, rd->seq_num);
1476                 bus->sdcnt.rx_badseq++;
1477                 rd->seq_num = rx_seq;
1478         }
1479         /* no need to check the reset for subframe */
1480         if (type == BRCMF_SDIO_FT_SUB)
1481                 return 0;
1482         rd->len_nxtfrm = (swheader & SDPCM_NEXTLEN_MASK) >> SDPCM_NEXTLEN_SHIFT;
1483         if (rd->len_nxtfrm << 4 > MAX_RX_DATASZ) {
1484                 /* only warm for NON glom packet */
1485                 if (rd->channel != SDPCM_GLOM_CHANNEL)
1486                         brcmf_err("seq %d: next length error\n", rx_seq);
1487                 rd->len_nxtfrm = 0;
1488         }
1489         swheader = le32_to_cpu(*(__le32 *)(header + 4));
1490         fc = swheader & SDPCM_FCMASK_MASK;
1491         if (bus->flowcontrol != fc) {
1492                 if (~bus->flowcontrol & fc)
1493                         bus->sdcnt.fc_xoff++;
1494                 if (bus->flowcontrol & ~fc)
1495                         bus->sdcnt.fc_xon++;
1496                 bus->sdcnt.fc_rcvd++;
1497                 bus->flowcontrol = fc;
1498         }
1499         tx_seq_max = (swheader & SDPCM_WINDOW_MASK) >> SDPCM_WINDOW_SHIFT;
1500         if ((u8)(tx_seq_max - bus->tx_seq) > 0x40) {
1501                 brcmf_err("seq %d: max tx seq number error\n", rx_seq);
1502                 tx_seq_max = bus->tx_seq + 2;
1503         }
1504         bus->tx_max = tx_seq_max;
1505
1506         return 0;
1507 }
1508
1509 static inline void brcmf_sdio_update_hwhdr(u8 *header, u16 frm_length)
1510 {
1511         *(__le16 *)header = cpu_to_le16(frm_length);
1512         *(((__le16 *)header) + 1) = cpu_to_le16(~frm_length);
1513 }
1514
1515 static void brcmf_sdio_hdpack(struct brcmf_sdio *bus, u8 *header,
1516                               struct brcmf_sdio_hdrinfo *hd_info)
1517 {
1518         u32 hdrval;
1519         u8 hdr_offset;
1520
1521         brcmf_sdio_update_hwhdr(header, hd_info->len);
1522         hdr_offset = SDPCM_HWHDR_LEN;
1523
1524         if (bus->txglom) {
1525                 hdrval = (hd_info->len - hdr_offset) | (hd_info->lastfrm << 24);
1526                 *((__le32 *)(header + hdr_offset)) = cpu_to_le32(hdrval);
1527                 hdrval = (u16)hd_info->tail_pad << 16;
1528                 *(((__le32 *)(header + hdr_offset)) + 1) = cpu_to_le32(hdrval);
1529                 hdr_offset += SDPCM_HWEXT_LEN;
1530         }
1531
1532         hdrval = hd_info->seq_num;
1533         hdrval |= (hd_info->channel << SDPCM_CHANNEL_SHIFT) &
1534                   SDPCM_CHANNEL_MASK;
1535         hdrval |= (hd_info->dat_offset << SDPCM_DOFFSET_SHIFT) &
1536                   SDPCM_DOFFSET_MASK;
1537         *((__le32 *)(header + hdr_offset)) = cpu_to_le32(hdrval);
1538         *(((__le32 *)(header + hdr_offset)) + 1) = 0;
1539         trace_brcmf_sdpcm_hdr(SDPCM_TX + !!(bus->txglom), header);
1540 }
1541
1542 static u8 brcmf_sdio_rxglom(struct brcmf_sdio *bus, u8 rxseq)
1543 {
1544         u16 dlen, totlen;
1545         u8 *dptr, num = 0;
1546         u16 sublen;
1547         struct sk_buff *pfirst, *pnext;
1548
1549         int errcode;
1550         u8 doff, sfdoff;
1551
1552         struct brcmf_sdio_hdrinfo rd_new;
1553
1554         /* If packets, issue read(s) and send up packet chain */
1555         /* Return sequence numbers consumed? */
1556
1557         brcmf_dbg(SDIO, "start: glomd %p glom %p\n",
1558                   bus->glomd, skb_peek(&bus->glom));
1559
1560         /* If there's a descriptor, generate the packet chain */
1561         if (bus->glomd) {
1562                 pfirst = pnext = NULL;
1563                 dlen = (u16) (bus->glomd->len);
1564                 dptr = bus->glomd->data;
1565                 if (!dlen || (dlen & 1)) {
1566                         brcmf_err("bad glomd len(%d), ignore descriptor\n",
1567                                   dlen);
1568                         dlen = 0;
1569                 }
1570
1571                 for (totlen = num = 0; dlen; num++) {
1572                         /* Get (and move past) next length */
1573                         sublen = get_unaligned_le16(dptr);
1574                         dlen -= sizeof(u16);
1575                         dptr += sizeof(u16);
1576                         if ((sublen < SDPCM_HDRLEN) ||
1577                             ((num == 0) && (sublen < (2 * SDPCM_HDRLEN)))) {
1578                                 brcmf_err("descriptor len %d bad: %d\n",
1579                                           num, sublen);
1580                                 pnext = NULL;
1581                                 break;
1582                         }
1583                         if (sublen % bus->sgentry_align) {
1584                                 brcmf_err("sublen %d not multiple of %d\n",
1585                                           sublen, bus->sgentry_align);
1586                         }
1587                         totlen += sublen;
1588
1589                         /* For last frame, adjust read len so total
1590                                  is a block multiple */
1591                         if (!dlen) {
1592                                 sublen +=
1593                                     (roundup(totlen, bus->blocksize) - totlen);
1594                                 totlen = roundup(totlen, bus->blocksize);
1595                         }
1596
1597                         /* Allocate/chain packet for next subframe */
1598                         pnext = brcmu_pkt_buf_get_skb(sublen + bus->sgentry_align);
1599                         if (pnext == NULL) {
1600                                 brcmf_err("bcm_pkt_buf_get_skb failed, num %d len %d\n",
1601                                           num, sublen);
1602                                 break;
1603                         }
1604                         skb_queue_tail(&bus->glom, pnext);
1605
1606                         /* Adhere to start alignment requirements */
1607                         pkt_align(pnext, sublen, bus->sgentry_align);
1608                 }
1609
1610                 /* If all allocations succeeded, save packet chain
1611                          in bus structure */
1612                 if (pnext) {
1613                         brcmf_dbg(GLOM, "allocated %d-byte packet chain for %d subframes\n",
1614                                   totlen, num);
1615                         if (BRCMF_GLOM_ON() && bus->cur_read.len &&
1616                             totlen != bus->cur_read.len) {
1617                                 brcmf_dbg(GLOM, "glomdesc mismatch: nextlen %d glomdesc %d rxseq %d\n",
1618                                           bus->cur_read.len, totlen, rxseq);
1619                         }
1620                         pfirst = pnext = NULL;
1621                 } else {
1622                         brcmf_sdio_free_glom(bus);
1623                         num = 0;
1624                 }
1625
1626                 /* Done with descriptor packet */
1627                 brcmu_pkt_buf_free_skb(bus->glomd);
1628                 bus->glomd = NULL;
1629                 bus->cur_read.len = 0;
1630         }
1631
1632         /* Ok -- either we just generated a packet chain,
1633                  or had one from before */
1634         if (!skb_queue_empty(&bus->glom)) {
1635                 if (BRCMF_GLOM_ON()) {
1636                         brcmf_dbg(GLOM, "try superframe read, packet chain:\n");
1637                         skb_queue_walk(&bus->glom, pnext) {
1638                                 brcmf_dbg(GLOM, "    %p: %p len 0x%04x (%d)\n",
1639                                           pnext, (u8 *) (pnext->data),
1640                                           pnext->len, pnext->len);
1641                         }
1642                 }
1643
1644                 pfirst = skb_peek(&bus->glom);
1645                 dlen = (u16) brcmf_sdio_glom_len(bus);
1646
1647                 /* Do an SDIO read for the superframe.  Configurable iovar to
1648                  * read directly into the chained packet, or allocate a large
1649                  * packet and and copy into the chain.
1650                  */
1651                 sdio_claim_host(bus->sdiodev->func[1]);
1652                 errcode = brcmf_sdiod_recv_chain(bus->sdiodev,
1653                                                  &bus->glom, dlen);
1654                 sdio_release_host(bus->sdiodev->func[1]);
1655                 bus->sdcnt.f2rxdata++;
1656
1657                 /* On failure, kill the superframe, allow a couple retries */
1658                 if (errcode < 0) {
1659                         brcmf_err("glom read of %d bytes failed: %d\n",
1660                                   dlen, errcode);
1661
1662                         sdio_claim_host(bus->sdiodev->func[1]);
1663                         if (bus->glomerr++ < 3) {
1664                                 brcmf_sdio_rxfail(bus, true, true);
1665                         } else {
1666                                 bus->glomerr = 0;
1667                                 brcmf_sdio_rxfail(bus, true, false);
1668                                 bus->sdcnt.rxglomfail++;
1669                                 brcmf_sdio_free_glom(bus);
1670                         }
1671                         sdio_release_host(bus->sdiodev->func[1]);
1672                         return 0;
1673                 }
1674
1675                 brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
1676                                    pfirst->data, min_t(int, pfirst->len, 48),
1677                                    "SUPERFRAME:\n");
1678
1679                 rd_new.seq_num = rxseq;
1680                 rd_new.len = dlen;
1681                 sdio_claim_host(bus->sdiodev->func[1]);
1682                 errcode = brcmf_sdio_hdparse(bus, pfirst->data, &rd_new,
1683                                              BRCMF_SDIO_FT_SUPER);
1684                 sdio_release_host(bus->sdiodev->func[1]);
1685                 bus->cur_read.len = rd_new.len_nxtfrm << 4;
1686
1687                 /* Remove superframe header, remember offset */
1688                 skb_pull(pfirst, rd_new.dat_offset);
1689                 sfdoff = rd_new.dat_offset;
1690                 num = 0;
1691
1692                 /* Validate all the subframe headers */
1693                 skb_queue_walk(&bus->glom, pnext) {
1694                         /* leave when invalid subframe is found */
1695                         if (errcode)
1696                                 break;
1697
1698                         rd_new.len = pnext->len;
1699                         rd_new.seq_num = rxseq++;
1700                         sdio_claim_host(bus->sdiodev->func[1]);
1701                         errcode = brcmf_sdio_hdparse(bus, pnext->data, &rd_new,
1702                                                      BRCMF_SDIO_FT_SUB);
1703                         sdio_release_host(bus->sdiodev->func[1]);
1704                         brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
1705                                            pnext->data, 32, "subframe:\n");
1706
1707                         num++;
1708                 }
1709
1710                 if (errcode) {
1711                         /* Terminate frame on error, request
1712                                  a couple retries */
1713                         sdio_claim_host(bus->sdiodev->func[1]);
1714                         if (bus->glomerr++ < 3) {
1715                                 /* Restore superframe header space */
1716                                 skb_push(pfirst, sfdoff);
1717                                 brcmf_sdio_rxfail(bus, true, true);
1718                         } else {
1719                                 bus->glomerr = 0;
1720                                 brcmf_sdio_rxfail(bus, true, false);
1721                                 bus->sdcnt.rxglomfail++;
1722                                 brcmf_sdio_free_glom(bus);
1723                         }
1724                         sdio_release_host(bus->sdiodev->func[1]);
1725                         bus->cur_read.len = 0;
1726                         return 0;
1727                 }
1728
1729                 /* Basic SD framing looks ok - process each packet (header) */
1730
1731                 skb_queue_walk_safe(&bus->glom, pfirst, pnext) {
1732                         dptr = (u8 *) (pfirst->data);
1733                         sublen = get_unaligned_le16(dptr);
1734                         doff = brcmf_sdio_getdatoffset(&dptr[SDPCM_HWHDR_LEN]);
1735
1736                         brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_DATA_ON(),
1737                                            dptr, pfirst->len,
1738                                            "Rx Subframe Data:\n");
1739
1740                         __skb_trim(pfirst, sublen);
1741                         skb_pull(pfirst, doff);
1742
1743                         if (pfirst->len == 0) {
1744                                 skb_unlink(pfirst, &bus->glom);
1745                                 brcmu_pkt_buf_free_skb(pfirst);
1746                                 continue;
1747                         }
1748
1749                         brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
1750                                            pfirst->data,
1751                                            min_t(int, pfirst->len, 32),
1752                                            "subframe %d to stack, %p (%p/%d) nxt/lnk %p/%p\n",
1753                                            bus->glom.qlen, pfirst, pfirst->data,
1754                                            pfirst->len, pfirst->next,
1755                                            pfirst->prev);
1756                         skb_unlink(pfirst, &bus->glom);
1757                         brcmf_rx_frame(bus->sdiodev->dev, pfirst);
1758                         bus->sdcnt.rxglompkts++;
1759                 }
1760
1761                 bus->sdcnt.rxglomframes++;
1762         }
1763         return num;
1764 }
1765
1766 static int brcmf_sdio_dcmd_resp_wait(struct brcmf_sdio *bus, uint *condition,
1767                                      bool *pending)
1768 {
1769         DECLARE_WAITQUEUE(wait, current);
1770         int timeout = msecs_to_jiffies(DCMD_RESP_TIMEOUT);
1771
1772         /* Wait until control frame is available */
1773         add_wait_queue(&bus->dcmd_resp_wait, &wait);
1774         set_current_state(TASK_INTERRUPTIBLE);
1775
1776         while (!(*condition) && (!signal_pending(current) && timeout))
1777                 timeout = schedule_timeout(timeout);
1778
1779         if (signal_pending(current))
1780                 *pending = true;
1781
1782         set_current_state(TASK_RUNNING);
1783         remove_wait_queue(&bus->dcmd_resp_wait, &wait);
1784
1785         return timeout;
1786 }
1787
1788 static int brcmf_sdio_dcmd_resp_wake(struct brcmf_sdio *bus)
1789 {
1790         if (waitqueue_active(&bus->dcmd_resp_wait))
1791                 wake_up_interruptible(&bus->dcmd_resp_wait);
1792
1793         return 0;
1794 }
1795 static void
1796 brcmf_sdio_read_control(struct brcmf_sdio *bus, u8 *hdr, uint len, uint doff)
1797 {
1798         uint rdlen, pad;
1799         u8 *buf = NULL, *rbuf;
1800         int sdret;
1801
1802         brcmf_dbg(TRACE, "Enter\n");
1803
1804         if (bus->rxblen)
1805                 buf = vzalloc(bus->rxblen);
1806         if (!buf)
1807                 goto done;
1808
1809         rbuf = bus->rxbuf;
1810         pad = ((unsigned long)rbuf % bus->head_align);
1811         if (pad)
1812                 rbuf += (bus->head_align - pad);
1813
1814         /* Copy the already-read portion over */
1815         memcpy(buf, hdr, BRCMF_FIRSTREAD);
1816         if (len <= BRCMF_FIRSTREAD)
1817                 goto gotpkt;
1818
1819         /* Raise rdlen to next SDIO block to avoid tail command */
1820         rdlen = len - BRCMF_FIRSTREAD;
1821         if (bus->roundup && bus->blocksize && (rdlen > bus->blocksize)) {
1822                 pad = bus->blocksize - (rdlen % bus->blocksize);
1823                 if ((pad <= bus->roundup) && (pad < bus->blocksize) &&
1824                     ((len + pad) < bus->sdiodev->bus_if->maxctl))
1825                         rdlen += pad;
1826         } else if (rdlen % bus->head_align) {
1827                 rdlen += bus->head_align - (rdlen % bus->head_align);
1828         }
1829
1830         /* Drop if the read is too big or it exceeds our maximum */
1831         if ((rdlen + BRCMF_FIRSTREAD) > bus->sdiodev->bus_if->maxctl) {
1832                 brcmf_err("%d-byte control read exceeds %d-byte buffer\n",
1833                           rdlen, bus->sdiodev->bus_if->maxctl);
1834                 brcmf_sdio_rxfail(bus, false, false);
1835                 goto done;
1836         }
1837
1838         if ((len - doff) > bus->sdiodev->bus_if->maxctl) {
1839                 brcmf_err("%d-byte ctl frame (%d-byte ctl data) exceeds %d-byte limit\n",
1840                           len, len - doff, bus->sdiodev->bus_if->maxctl);
1841                 bus->sdcnt.rx_toolong++;
1842                 brcmf_sdio_rxfail(bus, false, false);
1843                 goto done;
1844         }
1845
1846         /* Read remain of frame body */
1847         sdret = brcmf_sdiod_recv_buf(bus->sdiodev, rbuf, rdlen);
1848         bus->sdcnt.f2rxdata++;
1849
1850         /* Control frame failures need retransmission */
1851         if (sdret < 0) {
1852                 brcmf_err("read %d control bytes failed: %d\n",
1853                           rdlen, sdret);
1854                 bus->sdcnt.rxc_errors++;
1855                 brcmf_sdio_rxfail(bus, true, true);
1856                 goto done;
1857         } else
1858                 memcpy(buf + BRCMF_FIRSTREAD, rbuf, rdlen);
1859
1860 gotpkt:
1861
1862         brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_CTL_ON(),
1863                            buf, len, "RxCtrl:\n");
1864
1865         /* Point to valid data and indicate its length */
1866         spin_lock_bh(&bus->rxctl_lock);
1867         if (bus->rxctl) {
1868                 brcmf_err("last control frame is being processed.\n");
1869                 spin_unlock_bh(&bus->rxctl_lock);
1870                 vfree(buf);
1871                 goto done;
1872         }
1873         bus->rxctl = buf + doff;
1874         bus->rxctl_orig = buf;
1875         bus->rxlen = len - doff;
1876         spin_unlock_bh(&bus->rxctl_lock);
1877
1878 done:
1879         /* Awake any waiters */
1880         brcmf_sdio_dcmd_resp_wake(bus);
1881 }
1882
1883 /* Pad read to blocksize for efficiency */
1884 static void brcmf_sdio_pad(struct brcmf_sdio *bus, u16 *pad, u16 *rdlen)
1885 {
1886         if (bus->roundup && bus->blocksize && *rdlen > bus->blocksize) {
1887                 *pad = bus->blocksize - (*rdlen % bus->blocksize);
1888                 if (*pad <= bus->roundup && *pad < bus->blocksize &&
1889                     *rdlen + *pad + BRCMF_FIRSTREAD < MAX_RX_DATASZ)
1890                         *rdlen += *pad;
1891         } else if (*rdlen % bus->head_align) {
1892                 *rdlen += bus->head_align - (*rdlen % bus->head_align);
1893         }
1894 }
1895
1896 static uint brcmf_sdio_readframes(struct brcmf_sdio *bus, uint maxframes)
1897 {
1898         struct sk_buff *pkt;            /* Packet for event or data frames */
1899         u16 pad;                /* Number of pad bytes to read */
1900         uint rxleft = 0;        /* Remaining number of frames allowed */
1901         int ret;                /* Return code from calls */
1902         uint rxcount = 0;       /* Total frames read */
1903         struct brcmf_sdio_hdrinfo *rd = &bus->cur_read, rd_new;
1904         u8 head_read = 0;
1905
1906         brcmf_dbg(TRACE, "Enter\n");
1907
1908         /* Not finished unless we encounter no more frames indication */
1909         bus->rxpending = true;
1910
1911         for (rd->seq_num = bus->rx_seq, rxleft = maxframes;
1912              !bus->rxskip && rxleft && bus->sdiodev->state == BRCMF_STATE_DATA;
1913              rd->seq_num++, rxleft--) {
1914
1915                 /* Handle glomming separately */
1916                 if (bus->glomd || !skb_queue_empty(&bus->glom)) {
1917                         u8 cnt;
1918                         brcmf_dbg(GLOM, "calling rxglom: glomd %p, glom %p\n",
1919                                   bus->glomd, skb_peek(&bus->glom));
1920                         cnt = brcmf_sdio_rxglom(bus, rd->seq_num);
1921                         brcmf_dbg(GLOM, "rxglom returned %d\n", cnt);
1922                         rd->seq_num += cnt - 1;
1923                         rxleft = (rxleft > cnt) ? (rxleft - cnt) : 1;
1924                         continue;
1925                 }
1926
1927                 rd->len_left = rd->len;
1928                 /* read header first for unknow frame length */
1929                 sdio_claim_host(bus->sdiodev->func[1]);
1930                 if (!rd->len) {
1931                         ret = brcmf_sdiod_recv_buf(bus->sdiodev,
1932                                                    bus->rxhdr, BRCMF_FIRSTREAD);
1933                         bus->sdcnt.f2rxhdrs++;
1934                         if (ret < 0) {
1935                                 brcmf_err("RXHEADER FAILED: %d\n",
1936                                           ret);
1937                                 bus->sdcnt.rx_hdrfail++;
1938                                 brcmf_sdio_rxfail(bus, true, true);
1939                                 sdio_release_host(bus->sdiodev->func[1]);
1940                                 continue;
1941                         }
1942
1943                         brcmf_dbg_hex_dump(BRCMF_BYTES_ON() || BRCMF_HDRS_ON(),
1944                                            bus->rxhdr, SDPCM_HDRLEN,
1945                                            "RxHdr:\n");
1946
1947                         if (brcmf_sdio_hdparse(bus, bus->rxhdr, rd,
1948                                                BRCMF_SDIO_FT_NORMAL)) {
1949                                 sdio_release_host(bus->sdiodev->func[1]);
1950                                 if (!bus->rxpending)
1951                                         break;
1952                                 else
1953                                         continue;
1954                         }
1955
1956                         if (rd->channel == SDPCM_CONTROL_CHANNEL) {
1957                                 brcmf_sdio_read_control(bus, bus->rxhdr,
1958                                                         rd->len,
1959                                                         rd->dat_offset);
1960                                 /* prepare the descriptor for the next read */
1961                                 rd->len = rd->len_nxtfrm << 4;
1962                                 rd->len_nxtfrm = 0;
1963                                 /* treat all packet as event if we don't know */
1964                                 rd->channel = SDPCM_EVENT_CHANNEL;
1965                                 sdio_release_host(bus->sdiodev->func[1]);
1966                                 continue;
1967                         }
1968                         rd->len_left = rd->len > BRCMF_FIRSTREAD ?
1969                                        rd->len - BRCMF_FIRSTREAD : 0;
1970                         head_read = BRCMF_FIRSTREAD;
1971                 }
1972
1973                 brcmf_sdio_pad(bus, &pad, &rd->len_left);
1974
1975                 pkt = brcmu_pkt_buf_get_skb(rd->len_left + head_read +
1976                                             bus->head_align);
1977                 if (!pkt) {
1978                         /* Give up on data, request rtx of events */
1979                         brcmf_err("brcmu_pkt_buf_get_skb failed\n");
1980                         brcmf_sdio_rxfail(bus, false,
1981                                             RETRYCHAN(rd->channel));
1982                         sdio_release_host(bus->sdiodev->func[1]);
1983                         continue;
1984                 }
1985                 skb_pull(pkt, head_read);
1986                 pkt_align(pkt, rd->len_left, bus->head_align);
1987
1988                 ret = brcmf_sdiod_recv_pkt(bus->sdiodev, pkt);
1989                 bus->sdcnt.f2rxdata++;
1990                 sdio_release_host(bus->sdiodev->func[1]);
1991
1992                 if (ret < 0) {
1993                         brcmf_err("read %d bytes from channel %d failed: %d\n",
1994                                   rd->len, rd->channel, ret);
1995                         brcmu_pkt_buf_free_skb(pkt);
1996                         sdio_claim_host(bus->sdiodev->func[1]);
1997                         brcmf_sdio_rxfail(bus, true,
1998                                             RETRYCHAN(rd->channel));
1999                         sdio_release_host(bus->sdiodev->func[1]);
2000                         continue;
2001                 }
2002
2003                 if (head_read) {
2004                         skb_push(pkt, head_read);
2005                         memcpy(pkt->data, bus->rxhdr, head_read);
2006                         head_read = 0;
2007                 } else {
2008                         memcpy(bus->rxhdr, pkt->data, SDPCM_HDRLEN);
2009                         rd_new.seq_num = rd->seq_num;
2010                         sdio_claim_host(bus->sdiodev->func[1]);
2011                         if (brcmf_sdio_hdparse(bus, bus->rxhdr, &rd_new,
2012                                                BRCMF_SDIO_FT_NORMAL)) {
2013                                 rd->len = 0;
2014                                 brcmu_pkt_buf_free_skb(pkt);
2015                         }
2016                         bus->sdcnt.rx_readahead_cnt++;
2017                         if (rd->len != roundup(rd_new.len, 16)) {
2018                                 brcmf_err("frame length mismatch:read %d, should be %d\n",
2019                                           rd->len,
2020                                           roundup(rd_new.len, 16) >> 4);
2021                                 rd->len = 0;
2022                                 brcmf_sdio_rxfail(bus, true, true);
2023                                 sdio_release_host(bus->sdiodev->func[1]);
2024                                 brcmu_pkt_buf_free_skb(pkt);
2025                                 continue;
2026                         }
2027                         sdio_release_host(bus->sdiodev->func[1]);
2028                         rd->len_nxtfrm = rd_new.len_nxtfrm;
2029                         rd->channel = rd_new.channel;
2030                         rd->dat_offset = rd_new.dat_offset;
2031
2032                         brcmf_dbg_hex_dump(!(BRCMF_BYTES_ON() &&
2033                                              BRCMF_DATA_ON()) &&
2034                                            BRCMF_HDRS_ON(),
2035                                            bus->rxhdr, SDPCM_HDRLEN,
2036                                            "RxHdr:\n");
2037
2038                         if (rd_new.channel == SDPCM_CONTROL_CHANNEL) {
2039                                 brcmf_err("readahead on control packet %d?\n",
2040                                           rd_new.seq_num);
2041                                 /* Force retry w/normal header read */
2042                                 rd->len = 0;
2043                                 sdio_claim_host(bus->sdiodev->func[1]);
2044                                 brcmf_sdio_rxfail(bus, false, true);
2045                                 sdio_release_host(bus->sdiodev->func[1]);
2046                                 brcmu_pkt_buf_free_skb(pkt);
2047                                 continue;
2048                         }
2049                 }
2050
2051                 brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_DATA_ON(),
2052                                    pkt->data, rd->len, "Rx Data:\n");
2053
2054                 /* Save superframe descriptor and allocate packet frame */
2055                 if (rd->channel == SDPCM_GLOM_CHANNEL) {
2056                         if (SDPCM_GLOMDESC(&bus->rxhdr[SDPCM_HWHDR_LEN])) {
2057                                 brcmf_dbg(GLOM, "glom descriptor, %d bytes:\n",
2058                                           rd->len);
2059                                 brcmf_dbg_hex_dump(BRCMF_GLOM_ON(),
2060                                                    pkt->data, rd->len,
2061                                                    "Glom Data:\n");
2062                                 __skb_trim(pkt, rd->len);
2063                                 skb_pull(pkt, SDPCM_HDRLEN);
2064                                 bus->glomd = pkt;
2065                         } else {
2066                                 brcmf_err("%s: glom superframe w/o "
2067                                           "descriptor!\n", __func__);
2068                                 sdio_claim_host(bus->sdiodev->func[1]);
2069                                 brcmf_sdio_rxfail(bus, false, false);
2070                                 sdio_release_host(bus->sdiodev->func[1]);
2071                         }
2072                         /* prepare the descriptor for the next read */
2073                         rd->len = rd->len_nxtfrm << 4;
2074                         rd->len_nxtfrm = 0;
2075                         /* treat all packet as event if we don't know */
2076                         rd->channel = SDPCM_EVENT_CHANNEL;
2077                         continue;
2078                 }
2079
2080                 /* Fill in packet len and prio, deliver upward */
2081                 __skb_trim(pkt, rd->len);
2082                 skb_pull(pkt, rd->dat_offset);
2083
2084                 /* prepare the descriptor for the next read */
2085                 rd->len = rd->len_nxtfrm << 4;
2086                 rd->len_nxtfrm = 0;
2087                 /* treat all packet as event if we don't know */
2088                 rd->channel = SDPCM_EVENT_CHANNEL;
2089
2090                 if (pkt->len == 0) {
2091                         brcmu_pkt_buf_free_skb(pkt);
2092                         continue;
2093                 }
2094
2095                 brcmf_rx_frame(bus->sdiodev->dev, pkt);
2096         }
2097
2098         rxcount = maxframes - rxleft;
2099         /* Message if we hit the limit */
2100         if (!rxleft)
2101                 brcmf_dbg(DATA, "hit rx limit of %d frames\n", maxframes);
2102         else
2103                 brcmf_dbg(DATA, "processed %d frames\n", rxcount);
2104         /* Back off rxseq if awaiting rtx, update rx_seq */
2105         if (bus->rxskip)
2106                 rd->seq_num--;
2107         bus->rx_seq = rd->seq_num;
2108
2109         return rxcount;
2110 }
2111
2112 static void
2113 brcmf_sdio_wait_event_wakeup(struct brcmf_sdio *bus)
2114 {
2115         if (waitqueue_active(&bus->ctrl_wait))
2116                 wake_up_interruptible(&bus->ctrl_wait);
2117         return;
2118 }
2119
2120 static int brcmf_sdio_txpkt_hdalign(struct brcmf_sdio *bus, struct sk_buff *pkt)
2121 {
2122         u16 head_pad;
2123         u8 *dat_buf;
2124
2125         dat_buf = (u8 *)(pkt->data);
2126
2127         /* Check head padding */
2128         head_pad = ((unsigned long)dat_buf % bus->head_align);
2129         if (head_pad) {
2130                 if (skb_headroom(pkt) < head_pad) {
2131                         bus->sdiodev->bus_if->tx_realloc++;
2132                         head_pad = 0;
2133                         if (skb_cow(pkt, head_pad))
2134                                 return -ENOMEM;
2135                 }
2136                 skb_push(pkt, head_pad);
2137                 dat_buf = (u8 *)(pkt->data);
2138                 memset(dat_buf, 0, head_pad + bus->tx_hdrlen);
2139         }
2140         return head_pad;
2141 }
2142
2143 /**
2144  * struct brcmf_skbuff_cb reserves first two bytes in sk_buff::cb for
2145  * bus layer usage.
2146  */
2147 /* flag marking a dummy skb added for DMA alignment requirement */
2148 #define ALIGN_SKB_FLAG          0x8000
2149 /* bit mask of data length chopped from the previous packet */
2150 #define ALIGN_SKB_CHOP_LEN_MASK 0x7fff
2151
2152 static int brcmf_sdio_txpkt_prep_sg(struct brcmf_sdio *bus,
2153                                     struct sk_buff_head *pktq,
2154                                     struct sk_buff *pkt, u16 total_len)
2155 {
2156         struct brcmf_sdio_dev *sdiodev;
2157         struct sk_buff *pkt_pad;
2158         u16 tail_pad, tail_chop, chain_pad;
2159         unsigned int blksize;
2160         bool lastfrm;
2161         int ntail, ret;
2162
2163         sdiodev = bus->sdiodev;
2164         blksize = sdiodev->func[SDIO_FUNC_2]->cur_blksize;
2165         /* sg entry alignment should be a divisor of block size */
2166         WARN_ON(blksize % bus->sgentry_align);
2167
2168         /* Check tail padding */
2169         lastfrm = skb_queue_is_last(pktq, pkt);
2170         tail_pad = 0;
2171         tail_chop = pkt->len % bus->sgentry_align;
2172         if (tail_chop)
2173                 tail_pad = bus->sgentry_align - tail_chop;
2174         chain_pad = (total_len + tail_pad) % blksize;
2175         if (lastfrm && chain_pad)
2176                 tail_pad += blksize - chain_pad;
2177         if (skb_tailroom(pkt) < tail_pad && pkt->len > blksize) {
2178                 pkt_pad = brcmu_pkt_buf_get_skb(tail_pad + tail_chop +
2179                                                 bus->head_align);
2180                 if (pkt_pad == NULL)
2181                         return -ENOMEM;
2182                 ret = brcmf_sdio_txpkt_hdalign(bus, pkt_pad);
2183                 if (unlikely(ret < 0)) {
2184                         kfree_skb(pkt_pad);
2185                         return ret;
2186                 }
2187                 memcpy(pkt_pad->data,
2188                        pkt->data + pkt->len - tail_chop,
2189                        tail_chop);
2190                 *(u16 *)(pkt_pad->cb) = ALIGN_SKB_FLAG + tail_chop;
2191                 skb_trim(pkt, pkt->len - tail_chop);
2192                 skb_trim(pkt_pad, tail_pad + tail_chop);
2193                 __skb_queue_after(pktq, pkt, pkt_pad);
2194         } else {
2195                 ntail = pkt->data_len + tail_pad -
2196                         (pkt->end - pkt->tail);
2197                 if (skb_cloned(pkt) || ntail > 0)
2198                         if (pskb_expand_head(pkt, 0, ntail, GFP_ATOMIC))
2199                                 return -ENOMEM;
2200                 if (skb_linearize(pkt))
2201                         return -ENOMEM;
2202                 __skb_put(pkt, tail_pad);
2203         }
2204
2205         return tail_pad;
2206 }
2207
2208 /**
2209  * brcmf_sdio_txpkt_prep - packet preparation for transmit
2210  * @bus: brcmf_sdio structure pointer
2211  * @pktq: packet list pointer
2212  * @chan: virtual channel to transmit the packet
2213  *
2214  * Processes to be applied to the packet
2215  *      - Align data buffer pointer
2216  *      - Align data buffer length
2217  *      - Prepare header
2218  * Return: negative value if there is error
2219  */
2220 static int
2221 brcmf_sdio_txpkt_prep(struct brcmf_sdio *bus, struct sk_buff_head *pktq,
2222                       uint chan)
2223 {
2224         u16 head_pad, total_len;
2225         struct sk_buff *pkt_next;
2226         u8 txseq;
2227         int ret;
2228         struct brcmf_sdio_hdrinfo hd_info = {0};
2229
2230         txseq = bus->tx_seq;
2231         total_len = 0;
2232         skb_queue_walk(pktq, pkt_next) {
2233                 /* alignment packet inserted in previous
2234                  * loop cycle can be skipped as it is
2235                  * already properly aligned and does not
2236                  * need an sdpcm header.
2237                  */
2238                 if (*(u16 *)(pkt_next->cb) & ALIGN_SKB_FLAG)
2239                         continue;
2240
2241                 /* align packet data pointer */
2242                 ret = brcmf_sdio_txpkt_hdalign(bus, pkt_next);
2243                 if (ret < 0)
2244                         return ret;
2245                 head_pad = (u16)ret;
2246                 if (head_pad)
2247                         memset(pkt_next->data + bus->tx_hdrlen, 0, head_pad);
2248
2249                 total_len += pkt_next->len;
2250
2251                 hd_info.len = pkt_next->len;
2252                 hd_info.lastfrm = skb_queue_is_last(pktq, pkt_next);
2253                 if (bus->txglom && pktq->qlen > 1) {
2254                         ret = brcmf_sdio_txpkt_prep_sg(bus, pktq,
2255                                                        pkt_next, total_len);
2256                         if (ret < 0)
2257                                 return ret;
2258                         hd_info.tail_pad = (u16)ret;
2259                         total_len += (u16)ret;
2260                 }
2261
2262                 hd_info.channel = chan;
2263                 hd_info.dat_offset = head_pad + bus->tx_hdrlen;
2264                 hd_info.seq_num = txseq++;
2265
2266                 /* Now fill the header */
2267                 brcmf_sdio_hdpack(bus, pkt_next->data, &hd_info);
2268
2269                 if (BRCMF_BYTES_ON() &&
2270                     ((BRCMF_CTL_ON() && chan == SDPCM_CONTROL_CHANNEL) ||
2271                      (BRCMF_DATA_ON() && chan != SDPCM_CONTROL_CHANNEL)))
2272                         brcmf_dbg_hex_dump(true, pkt_next->data, hd_info.len,
2273                                            "Tx Frame:\n");
2274                 else if (BRCMF_HDRS_ON())
2275                         brcmf_dbg_hex_dump(true, pkt_next->data,
2276                                            head_pad + bus->tx_hdrlen,
2277                                            "Tx Header:\n");
2278         }
2279         /* Hardware length tag of the first packet should be total
2280          * length of the chain (including padding)
2281          */
2282         if (bus->txglom)
2283                 brcmf_sdio_update_hwhdr(pktq->next->data, total_len);
2284         return 0;
2285 }
2286
2287 /**
2288  * brcmf_sdio_txpkt_postp - packet post processing for transmit
2289  * @bus: brcmf_sdio structure pointer
2290  * @pktq: packet list pointer
2291  *
2292  * Processes to be applied to the packet
2293  *      - Remove head padding
2294  *      - Remove tail padding
2295  */
2296 static void
2297 brcmf_sdio_txpkt_postp(struct brcmf_sdio *bus, struct sk_buff_head *pktq)
2298 {
2299         u8 *hdr;
2300         u32 dat_offset;
2301         u16 tail_pad;
2302         u16 dummy_flags, chop_len;
2303         struct sk_buff *pkt_next, *tmp, *pkt_prev;
2304
2305         skb_queue_walk_safe(pktq, pkt_next, tmp) {
2306                 dummy_flags = *(u16 *)(pkt_next->cb);
2307                 if (dummy_flags & ALIGN_SKB_FLAG) {
2308                         chop_len = dummy_flags & ALIGN_SKB_CHOP_LEN_MASK;
2309                         if (chop_len) {
2310                                 pkt_prev = pkt_next->prev;
2311                                 skb_put(pkt_prev, chop_len);
2312                         }
2313                         __skb_unlink(pkt_next, pktq);
2314                         brcmu_pkt_buf_free_skb(pkt_next);
2315                 } else {
2316                         hdr = pkt_next->data + bus->tx_hdrlen - SDPCM_SWHDR_LEN;
2317                         dat_offset = le32_to_cpu(*(__le32 *)hdr);
2318                         dat_offset = (dat_offset & SDPCM_DOFFSET_MASK) >>
2319                                      SDPCM_DOFFSET_SHIFT;
2320                         skb_pull(pkt_next, dat_offset);
2321                         if (bus->txglom) {
2322                                 tail_pad = le16_to_cpu(*(__le16 *)(hdr - 2));
2323                                 skb_trim(pkt_next, pkt_next->len - tail_pad);
2324                         }
2325                 }
2326         }
2327 }
2328
2329 /* Writes a HW/SW header into the packet and sends it. */
2330 /* Assumes: (a) header space already there, (b) caller holds lock */
2331 static int brcmf_sdio_txpkt(struct brcmf_sdio *bus, struct sk_buff_head *pktq,
2332                             uint chan)
2333 {
2334         int ret;
2335         struct sk_buff *pkt_next, *tmp;
2336
2337         brcmf_dbg(TRACE, "Enter\n");
2338
2339         ret = brcmf_sdio_txpkt_prep(bus, pktq, chan);
2340         if (ret)
2341                 goto done;
2342
2343         sdio_claim_host(bus->sdiodev->func[1]);
2344         ret = brcmf_sdiod_send_pkt(bus->sdiodev, pktq);
2345         bus->sdcnt.f2txdata++;
2346
2347         if (ret < 0)
2348                 brcmf_sdio_txfail(bus);
2349
2350         sdio_release_host(bus->sdiodev->func[1]);
2351
2352 done:
2353         brcmf_sdio_txpkt_postp(bus, pktq);
2354         if (ret == 0)
2355                 bus->tx_seq = (bus->tx_seq + pktq->qlen) % SDPCM_SEQ_WRAP;
2356         skb_queue_walk_safe(pktq, pkt_next, tmp) {
2357                 __skb_unlink(pkt_next, pktq);
2358                 brcmf_txcomplete(bus->sdiodev->dev, pkt_next, ret == 0);
2359         }
2360         return ret;
2361 }
2362
2363 static uint brcmf_sdio_sendfromq(struct brcmf_sdio *bus, uint maxframes)
2364 {
2365         struct sk_buff *pkt;
2366         struct sk_buff_head pktq;
2367         u32 intstatus = 0;
2368         int ret = 0, prec_out, i;
2369         uint cnt = 0;
2370         u8 tx_prec_map, pkt_num;
2371
2372         brcmf_dbg(TRACE, "Enter\n");
2373
2374         tx_prec_map = ~bus->flowcontrol;
2375
2376         /* Send frames until the limit or some other event */
2377         for (cnt = 0; (cnt < maxframes) && data_ok(bus);) {
2378                 pkt_num = 1;
2379                 if (bus->txglom)
2380                         pkt_num = min_t(u8, bus->tx_max - bus->tx_seq,
2381                                         bus->sdiodev->txglomsz);
2382                 pkt_num = min_t(u32, pkt_num,
2383                                 brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol));
2384                 __skb_queue_head_init(&pktq);
2385                 spin_lock_bh(&bus->txq_lock);
2386                 for (i = 0; i < pkt_num; i++) {
2387                         pkt = brcmu_pktq_mdeq(&bus->txq, tx_prec_map,
2388                                               &prec_out);
2389                         if (pkt == NULL)
2390                                 break;
2391                         __skb_queue_tail(&pktq, pkt);
2392                 }
2393                 spin_unlock_bh(&bus->txq_lock);
2394                 if (i == 0)
2395                         break;
2396
2397                 ret = brcmf_sdio_txpkt(bus, &pktq, SDPCM_DATA_CHANNEL);
2398
2399                 cnt += i;
2400
2401                 /* In poll mode, need to check for other events */
2402                 if (!bus->intr) {
2403                         /* Check device status, signal pending interrupt */
2404                         sdio_claim_host(bus->sdiodev->func[1]);
2405                         ret = r_sdreg32(bus, &intstatus,
2406                                         offsetof(struct sdpcmd_regs,
2407                                                  intstatus));
2408                         sdio_release_host(bus->sdiodev->func[1]);
2409                         bus->sdcnt.f2txdata++;
2410                         if (ret != 0)
2411                                 break;
2412                         if (intstatus & bus->hostintmask)
2413                                 atomic_set(&bus->ipend, 1);
2414                 }
2415         }
2416
2417         /* Deflow-control stack if needed */
2418         if ((bus->sdiodev->state == BRCMF_STATE_DATA) &&
2419             bus->txoff && (pktq_len(&bus->txq) < TXLOW)) {
2420                 bus->txoff = false;
2421                 brcmf_txflowblock(bus->sdiodev->dev, false);
2422         }
2423
2424         return cnt;
2425 }
2426
2427 static int brcmf_sdio_tx_ctrlframe(struct brcmf_sdio *bus, u8 *frame, u16 len)
2428 {
2429         u8 doff;
2430         u16 pad;
2431         uint retries = 0;
2432         struct brcmf_sdio_hdrinfo hd_info = {0};
2433         int ret;
2434
2435         brcmf_dbg(TRACE, "Enter\n");
2436
2437         /* Back the pointer to make room for bus header */
2438         frame -= bus->tx_hdrlen;
2439         len += bus->tx_hdrlen;
2440
2441         /* Add alignment padding (optional for ctl frames) */
2442         doff = ((unsigned long)frame % bus->head_align);
2443         if (doff) {
2444                 frame -= doff;
2445                 len += doff;
2446                 memset(frame + bus->tx_hdrlen, 0, doff);
2447         }
2448
2449         /* Round send length to next SDIO block */
2450         pad = 0;
2451         if (bus->roundup && bus->blocksize && (len > bus->blocksize)) {
2452                 pad = bus->blocksize - (len % bus->blocksize);
2453                 if ((pad > bus->roundup) || (pad >= bus->blocksize))
2454                         pad = 0;
2455         } else if (len % bus->head_align) {
2456                 pad = bus->head_align - (len % bus->head_align);
2457         }
2458         len += pad;
2459
2460         hd_info.len = len - pad;
2461         hd_info.channel = SDPCM_CONTROL_CHANNEL;
2462         hd_info.dat_offset = doff + bus->tx_hdrlen;
2463         hd_info.seq_num = bus->tx_seq;
2464         hd_info.lastfrm = true;
2465         hd_info.tail_pad = pad;
2466         brcmf_sdio_hdpack(bus, frame, &hd_info);
2467
2468         if (bus->txglom)
2469                 brcmf_sdio_update_hwhdr(frame, len);
2470
2471         brcmf_dbg_hex_dump(BRCMF_BYTES_ON() && BRCMF_CTL_ON(),
2472                            frame, len, "Tx Frame:\n");
2473         brcmf_dbg_hex_dump(!(BRCMF_BYTES_ON() && BRCMF_CTL_ON()) &&
2474                            BRCMF_HDRS_ON(),
2475                            frame, min_t(u16, len, 16), "TxHdr:\n");
2476
2477         do {
2478                 ret = brcmf_sdiod_send_buf(bus->sdiodev, frame, len);
2479
2480                 if (ret < 0)
2481                         brcmf_sdio_txfail(bus);
2482                 else
2483                         bus->tx_seq = (bus->tx_seq + 1) % SDPCM_SEQ_WRAP;
2484         } while (ret < 0 && retries++ < TXRETRIES);
2485
2486         return ret;
2487 }
2488
2489 static void brcmf_sdio_bus_stop(struct device *dev)
2490 {
2491         u32 local_hostintmask;
2492         u8 saveclk;
2493         int err;
2494         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
2495         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
2496         struct brcmf_sdio *bus = sdiodev->bus;
2497
2498         brcmf_dbg(TRACE, "Enter\n");
2499
2500         if (bus->watchdog_tsk) {
2501                 send_sig(SIGTERM, bus->watchdog_tsk, 1);
2502                 kthread_stop(bus->watchdog_tsk);
2503                 bus->watchdog_tsk = NULL;
2504         }
2505
2506         if (sdiodev->state != BRCMF_STATE_NOMEDIUM) {
2507                 sdio_claim_host(sdiodev->func[1]);
2508
2509                 /* Enable clock for device interrupts */
2510                 brcmf_sdio_bus_sleep(bus, false, false);
2511
2512                 /* Disable and clear interrupts at the chip level also */
2513                 w_sdreg32(bus, 0, offsetof(struct sdpcmd_regs, hostintmask));
2514                 local_hostintmask = bus->hostintmask;
2515                 bus->hostintmask = 0;
2516
2517                 /* Force backplane clocks to assure F2 interrupt propagates */
2518                 saveclk = brcmf_sdiod_regrb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
2519                                             &err);
2520                 if (!err)
2521                         brcmf_sdiod_regwb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
2522                                           (saveclk | SBSDIO_FORCE_HT), &err);
2523                 if (err)
2524                         brcmf_err("Failed to force clock for F2: err %d\n",
2525                                   err);
2526
2527                 /* Turn off the bus (F2), free any pending packets */
2528                 brcmf_dbg(INTR, "disable SDIO interrupts\n");
2529                 sdio_disable_func(sdiodev->func[SDIO_FUNC_2]);
2530
2531                 /* Clear any pending interrupts now that F2 is disabled */
2532                 w_sdreg32(bus, local_hostintmask,
2533                           offsetof(struct sdpcmd_regs, intstatus));
2534
2535                 sdio_release_host(sdiodev->func[1]);
2536         }
2537         /* Clear the data packet queues */
2538         brcmu_pktq_flush(&bus->txq, true, NULL, NULL);
2539
2540         /* Clear any held glomming stuff */
2541         brcmu_pkt_buf_free_skb(bus->glomd);
2542         brcmf_sdio_free_glom(bus);
2543
2544         /* Clear rx control and wake any waiters */
2545         spin_lock_bh(&bus->rxctl_lock);
2546         bus->rxlen = 0;
2547         spin_unlock_bh(&bus->rxctl_lock);
2548         brcmf_sdio_dcmd_resp_wake(bus);
2549
2550         /* Reset some F2 state stuff */
2551         bus->rxskip = false;
2552         bus->tx_seq = bus->rx_seq = 0;
2553 }
2554
2555 static inline void brcmf_sdio_clrintr(struct brcmf_sdio *bus)
2556 {
2557         unsigned long flags;
2558
2559         if (bus->sdiodev->oob_irq_requested) {
2560                 spin_lock_irqsave(&bus->sdiodev->irq_en_lock, flags);
2561                 if (!bus->sdiodev->irq_en && !atomic_read(&bus->ipend)) {
2562                         enable_irq(bus->sdiodev->pdata->oob_irq_nr);
2563                         bus->sdiodev->irq_en = true;
2564                 }
2565                 spin_unlock_irqrestore(&bus->sdiodev->irq_en_lock, flags);
2566         }
2567 }
2568
2569 static void atomic_orr(int val, atomic_t *v)
2570 {
2571         int old_val;
2572
2573         old_val = atomic_read(v);
2574         while (atomic_cmpxchg(v, old_val, val | old_val) != old_val)
2575                 old_val = atomic_read(v);
2576 }
2577
2578 static int brcmf_sdio_intr_rstatus(struct brcmf_sdio *bus)
2579 {
2580         struct brcmf_core *buscore;
2581         u32 addr;
2582         unsigned long val;
2583         int ret;
2584
2585         buscore = brcmf_chip_get_core(bus->ci, BCMA_CORE_SDIO_DEV);
2586         addr = buscore->base + offsetof(struct sdpcmd_regs, intstatus);
2587
2588         val = brcmf_sdiod_regrl(bus->sdiodev, addr, &ret);
2589         bus->sdcnt.f1regdata++;
2590         if (ret != 0)
2591                 return ret;
2592
2593         val &= bus->hostintmask;
2594         atomic_set(&bus->fcstate, !!(val & I_HMB_FC_STATE));
2595
2596         /* Clear interrupts */
2597         if (val) {
2598                 brcmf_sdiod_regwl(bus->sdiodev, addr, val, &ret);
2599                 bus->sdcnt.f1regdata++;
2600                 atomic_orr(val, &bus->intstatus);
2601         }
2602
2603         return ret;
2604 }
2605
2606 static int brcmf_sdio_pm_resume_wait(struct brcmf_sdio_dev *sdiodev)
2607 {
2608 #ifdef CONFIG_PM_SLEEP
2609         int retry;
2610
2611         /* Wait for possible resume to complete */
2612         retry = 0;
2613         while ((atomic_read(&sdiodev->suspend)) && (retry++ != 50))
2614                 msleep(20);
2615         if (atomic_read(&sdiodev->suspend))
2616                 return -EIO;
2617 #endif
2618         return 0;
2619 }
2620
2621 static void brcmf_sdio_dpc(struct brcmf_sdio *bus)
2622 {
2623         u32 newstatus = 0;
2624         unsigned long intstatus;
2625         uint txlimit = bus->txbound;    /* Tx frames to send before resched */
2626         uint framecnt;                  /* Temporary counter of tx/rx frames */
2627         int err = 0;
2628
2629         brcmf_dbg(TRACE, "Enter\n");
2630
2631         if (brcmf_sdio_pm_resume_wait(bus->sdiodev))
2632                 return;
2633
2634         sdio_claim_host(bus->sdiodev->func[1]);
2635
2636         /* If waiting for HTAVAIL, check status */
2637         if (!bus->sr_enabled && bus->clkstate == CLK_PENDING) {
2638                 u8 clkctl, devctl = 0;
2639
2640 #ifdef DEBUG
2641                 /* Check for inconsistent device control */
2642                 devctl = brcmf_sdiod_regrb(bus->sdiodev,
2643                                            SBSDIO_DEVICE_CTL, &err);
2644 #endif                          /* DEBUG */
2645
2646                 /* Read CSR, if clock on switch to AVAIL, else ignore */
2647                 clkctl = brcmf_sdiod_regrb(bus->sdiodev,
2648                                            SBSDIO_FUNC1_CHIPCLKCSR, &err);
2649
2650                 brcmf_dbg(SDIO, "DPC: PENDING, devctl 0x%02x clkctl 0x%02x\n",
2651                           devctl, clkctl);
2652
2653                 if (SBSDIO_HTAV(clkctl)) {
2654                         devctl = brcmf_sdiod_regrb(bus->sdiodev,
2655                                                    SBSDIO_DEVICE_CTL, &err);
2656                         devctl &= ~SBSDIO_DEVCTL_CA_INT_ONLY;
2657                         brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_DEVICE_CTL,
2658                                           devctl, &err);
2659                         bus->clkstate = CLK_AVAIL;
2660                 }
2661         }
2662
2663         /* Make sure backplane clock is on */
2664         brcmf_sdio_bus_sleep(bus, false, true);
2665
2666         /* Pending interrupt indicates new device status */
2667         if (atomic_read(&bus->ipend) > 0) {
2668                 atomic_set(&bus->ipend, 0);
2669                 err = brcmf_sdio_intr_rstatus(bus);
2670         }
2671
2672         /* Start with leftover status bits */
2673         intstatus = atomic_xchg(&bus->intstatus, 0);
2674
2675         /* Handle flow-control change: read new state in case our ack
2676          * crossed another change interrupt.  If change still set, assume
2677          * FC ON for safety, let next loop through do the debounce.
2678          */
2679         if (intstatus & I_HMB_FC_CHANGE) {
2680                 intstatus &= ~I_HMB_FC_CHANGE;
2681                 err = w_sdreg32(bus, I_HMB_FC_CHANGE,
2682                                 offsetof(struct sdpcmd_regs, intstatus));
2683
2684                 err = r_sdreg32(bus, &newstatus,
2685                                 offsetof(struct sdpcmd_regs, intstatus));
2686                 bus->sdcnt.f1regdata += 2;
2687                 atomic_set(&bus->fcstate,
2688                            !!(newstatus & (I_HMB_FC_STATE | I_HMB_FC_CHANGE)));
2689                 intstatus |= (newstatus & bus->hostintmask);
2690         }
2691
2692         /* Handle host mailbox indication */
2693         if (intstatus & I_HMB_HOST_INT) {
2694                 intstatus &= ~I_HMB_HOST_INT;
2695                 intstatus |= brcmf_sdio_hostmail(bus);
2696         }
2697
2698         sdio_release_host(bus->sdiodev->func[1]);
2699
2700         /* Generally don't ask for these, can get CRC errors... */
2701         if (intstatus & I_WR_OOSYNC) {
2702                 brcmf_err("Dongle reports WR_OOSYNC\n");
2703                 intstatus &= ~I_WR_OOSYNC;
2704         }
2705
2706         if (intstatus & I_RD_OOSYNC) {
2707                 brcmf_err("Dongle reports RD_OOSYNC\n");
2708                 intstatus &= ~I_RD_OOSYNC;
2709         }
2710
2711         if (intstatus & I_SBINT) {
2712                 brcmf_err("Dongle reports SBINT\n");
2713                 intstatus &= ~I_SBINT;
2714         }
2715
2716         /* Would be active due to wake-wlan in gSPI */
2717         if (intstatus & I_CHIPACTIVE) {
2718                 brcmf_dbg(INFO, "Dongle reports CHIPACTIVE\n");
2719                 intstatus &= ~I_CHIPACTIVE;
2720         }
2721
2722         /* Ignore frame indications if rxskip is set */
2723         if (bus->rxskip)
2724                 intstatus &= ~I_HMB_FRAME_IND;
2725
2726         /* On frame indication, read available frames */
2727         if ((intstatus & I_HMB_FRAME_IND) && (bus->clkstate == CLK_AVAIL)) {
2728                 brcmf_sdio_readframes(bus, bus->rxbound);
2729                 if (!bus->rxpending)
2730                         intstatus &= ~I_HMB_FRAME_IND;
2731         }
2732
2733         /* Keep still-pending events for next scheduling */
2734         if (intstatus)
2735                 atomic_orr(intstatus, &bus->intstatus);
2736
2737         brcmf_sdio_clrintr(bus);
2738
2739         if (bus->ctrl_frame_stat && (bus->clkstate == CLK_AVAIL) &&
2740             data_ok(bus)) {
2741                 sdio_claim_host(bus->sdiodev->func[1]);
2742                 err = brcmf_sdio_tx_ctrlframe(bus,  bus->ctrl_frame_buf,
2743                                               bus->ctrl_frame_len);
2744                 sdio_release_host(bus->sdiodev->func[1]);
2745                 bus->ctrl_frame_err = err;
2746                 bus->ctrl_frame_stat = false;
2747                 brcmf_sdio_wait_event_wakeup(bus);
2748         }
2749         /* Send queued frames (limit 1 if rx may still be pending) */
2750         if ((bus->clkstate == CLK_AVAIL) && !atomic_read(&bus->fcstate) &&
2751             brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol) && txlimit &&
2752             data_ok(bus)) {
2753                 framecnt = bus->rxpending ? min(txlimit, bus->txminmax) :
2754                                             txlimit;
2755                 brcmf_sdio_sendfromq(bus, framecnt);
2756         }
2757
2758         if ((bus->sdiodev->state != BRCMF_STATE_DATA) || (err != 0)) {
2759                 brcmf_err("failed backplane access over SDIO, halting operation\n");
2760                 atomic_set(&bus->intstatus, 0);
2761         } else if (atomic_read(&bus->intstatus) ||
2762                    atomic_read(&bus->ipend) > 0 ||
2763                    (!atomic_read(&bus->fcstate) &&
2764                     brcmu_pktq_mlen(&bus->txq, ~bus->flowcontrol) &&
2765                     data_ok(bus))) {
2766                 atomic_inc(&bus->dpc_tskcnt);
2767         }
2768 }
2769
2770 static struct pktq *brcmf_sdio_bus_gettxq(struct device *dev)
2771 {
2772         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
2773         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
2774         struct brcmf_sdio *bus = sdiodev->bus;
2775
2776         return &bus->txq;
2777 }
2778
2779 static bool brcmf_sdio_prec_enq(struct pktq *q, struct sk_buff *pkt, int prec)
2780 {
2781         struct sk_buff *p;
2782         int eprec = -1;         /* precedence to evict from */
2783
2784         /* Fast case, precedence queue is not full and we are also not
2785          * exceeding total queue length
2786          */
2787         if (!pktq_pfull(q, prec) && !pktq_full(q)) {
2788                 brcmu_pktq_penq(q, prec, pkt);
2789                 return true;
2790         }
2791
2792         /* Determine precedence from which to evict packet, if any */
2793         if (pktq_pfull(q, prec)) {
2794                 eprec = prec;
2795         } else if (pktq_full(q)) {
2796                 p = brcmu_pktq_peek_tail(q, &eprec);
2797                 if (eprec > prec)
2798                         return false;
2799         }
2800
2801         /* Evict if needed */
2802         if (eprec >= 0) {
2803                 /* Detect queueing to unconfigured precedence */
2804                 if (eprec == prec)
2805                         return false;   /* refuse newer (incoming) packet */
2806                 /* Evict packet according to discard policy */
2807                 p = brcmu_pktq_pdeq_tail(q, eprec);
2808                 if (p == NULL)
2809                         brcmf_err("brcmu_pktq_pdeq_tail() failed\n");
2810                 brcmu_pkt_buf_free_skb(p);
2811         }
2812
2813         /* Enqueue */
2814         p = brcmu_pktq_penq(q, prec, pkt);
2815         if (p == NULL)
2816                 brcmf_err("brcmu_pktq_penq() failed\n");
2817
2818         return p != NULL;
2819 }
2820
2821 static int brcmf_sdio_bus_txdata(struct device *dev, struct sk_buff *pkt)
2822 {
2823         int ret = -EBADE;
2824         uint prec;
2825         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
2826         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
2827         struct brcmf_sdio *bus = sdiodev->bus;
2828
2829         brcmf_dbg(TRACE, "Enter: pkt: data %p len %d\n", pkt->data, pkt->len);
2830
2831         /* Add space for the header */
2832         skb_push(pkt, bus->tx_hdrlen);
2833         /* precondition: IS_ALIGNED((unsigned long)(pkt->data), 2) */
2834
2835         prec = prio2prec((pkt->priority & PRIOMASK));
2836
2837         /* Check for existing queue, current flow-control,
2838                          pending event, or pending clock */
2839         brcmf_dbg(TRACE, "deferring pktq len %d\n", pktq_len(&bus->txq));
2840         bus->sdcnt.fcqueued++;
2841
2842         /* Priority based enq */
2843         spin_lock_bh(&bus->txq_lock);
2844         /* reset bus_flags in packet cb */
2845         *(u16 *)(pkt->cb) = 0;
2846         if (!brcmf_sdio_prec_enq(&bus->txq, pkt, prec)) {
2847                 skb_pull(pkt, bus->tx_hdrlen);
2848                 brcmf_err("out of bus->txq !!!\n");
2849                 ret = -ENOSR;
2850         } else {
2851                 ret = 0;
2852         }
2853
2854         if (pktq_len(&bus->txq) >= TXHI) {
2855                 bus->txoff = true;
2856                 brcmf_txflowblock(dev, true);
2857         }
2858         spin_unlock_bh(&bus->txq_lock);
2859
2860 #ifdef DEBUG
2861         if (pktq_plen(&bus->txq, prec) > qcount[prec])
2862                 qcount[prec] = pktq_plen(&bus->txq, prec);
2863 #endif
2864
2865         if (atomic_read(&bus->dpc_tskcnt) == 0) {
2866                 atomic_inc(&bus->dpc_tskcnt);
2867                 queue_work(bus->brcmf_wq, &bus->datawork);
2868         }
2869
2870         return ret;
2871 }
2872
2873 #ifdef DEBUG
2874 #define CONSOLE_LINE_MAX        192
2875
2876 static int brcmf_sdio_readconsole(struct brcmf_sdio *bus)
2877 {
2878         struct brcmf_console *c = &bus->console;
2879         u8 line[CONSOLE_LINE_MAX], ch;
2880         u32 n, idx, addr;
2881         int rv;
2882
2883         /* Don't do anything until FWREADY updates console address */
2884         if (bus->console_addr == 0)
2885                 return 0;
2886
2887         /* Read console log struct */
2888         addr = bus->console_addr + offsetof(struct rte_console, log_le);
2889         rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr, (u8 *)&c->log_le,
2890                                sizeof(c->log_le));
2891         if (rv < 0)
2892                 return rv;
2893
2894         /* Allocate console buffer (one time only) */
2895         if (c->buf == NULL) {
2896                 c->bufsize = le32_to_cpu(c->log_le.buf_size);
2897                 c->buf = kmalloc(c->bufsize, GFP_ATOMIC);
2898                 if (c->buf == NULL)
2899                         return -ENOMEM;
2900         }
2901
2902         idx = le32_to_cpu(c->log_le.idx);
2903
2904         /* Protect against corrupt value */
2905         if (idx > c->bufsize)
2906                 return -EBADE;
2907
2908         /* Skip reading the console buffer if the index pointer
2909          has not moved */
2910         if (idx == c->last)
2911                 return 0;
2912
2913         /* Read the console buffer */
2914         addr = le32_to_cpu(c->log_le.buf);
2915         rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr, c->buf, c->bufsize);
2916         if (rv < 0)
2917                 return rv;
2918
2919         while (c->last != idx) {
2920                 for (n = 0; n < CONSOLE_LINE_MAX - 2; n++) {
2921                         if (c->last == idx) {
2922                                 /* This would output a partial line.
2923                                  * Instead, back up
2924                                  * the buffer pointer and output this
2925                                  * line next time around.
2926                                  */
2927                                 if (c->last >= n)
2928                                         c->last -= n;
2929                                 else
2930                                         c->last = c->bufsize - n;
2931                                 goto break2;
2932                         }
2933                         ch = c->buf[c->last];
2934                         c->last = (c->last + 1) % c->bufsize;
2935                         if (ch == '\n')
2936                                 break;
2937                         line[n] = ch;
2938                 }
2939
2940                 if (n > 0) {
2941                         if (line[n - 1] == '\r')
2942                                 n--;
2943                         line[n] = 0;
2944                         pr_debug("CONSOLE: %s\n", line);
2945                 }
2946         }
2947 break2:
2948
2949         return 0;
2950 }
2951 #endif                          /* DEBUG */
2952
2953 static int
2954 brcmf_sdio_bus_txctl(struct device *dev, unsigned char *msg, uint msglen)
2955 {
2956         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
2957         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
2958         struct brcmf_sdio *bus = sdiodev->bus;
2959         int ret;
2960
2961         brcmf_dbg(TRACE, "Enter\n");
2962
2963         /* Send from dpc */
2964         bus->ctrl_frame_buf = msg;
2965         bus->ctrl_frame_len = msglen;
2966         bus->ctrl_frame_stat = true;
2967         if (atomic_read(&bus->dpc_tskcnt) == 0) {
2968                 atomic_inc(&bus->dpc_tskcnt);
2969                 queue_work(bus->brcmf_wq, &bus->datawork);
2970         }
2971
2972         wait_event_interruptible_timeout(bus->ctrl_wait, !bus->ctrl_frame_stat,
2973                                          msecs_to_jiffies(CTL_DONE_TIMEOUT));
2974
2975         if (!bus->ctrl_frame_stat) {
2976                 brcmf_dbg(SDIO, "ctrl_frame complete, err=%d\n",
2977                           bus->ctrl_frame_err);
2978                 ret = bus->ctrl_frame_err;
2979         } else {
2980                 brcmf_dbg(SDIO, "ctrl_frame timeout\n");
2981                 bus->ctrl_frame_stat = false;
2982                 ret = -ETIMEDOUT;
2983         }
2984
2985         if (ret)
2986                 bus->sdcnt.tx_ctlerrs++;
2987         else
2988                 bus->sdcnt.tx_ctlpkts++;
2989
2990         return ret;
2991 }
2992
2993 #ifdef DEBUG
2994 static int brcmf_sdio_dump_console(struct seq_file *seq, struct brcmf_sdio *bus,
2995                                    struct sdpcm_shared *sh)
2996 {
2997         u32 addr, console_ptr, console_size, console_index;
2998         char *conbuf = NULL;
2999         __le32 sh_val;
3000         int rv;
3001
3002         /* obtain console information from device memory */
3003         addr = sh->console_addr + offsetof(struct rte_console, log_le);
3004         rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr,
3005                                (u8 *)&sh_val, sizeof(u32));
3006         if (rv < 0)
3007                 return rv;
3008         console_ptr = le32_to_cpu(sh_val);
3009
3010         addr = sh->console_addr + offsetof(struct rte_console, log_le.buf_size);
3011         rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr,
3012                                (u8 *)&sh_val, sizeof(u32));
3013         if (rv < 0)
3014                 return rv;
3015         console_size = le32_to_cpu(sh_val);
3016
3017         addr = sh->console_addr + offsetof(struct rte_console, log_le.idx);
3018         rv = brcmf_sdiod_ramrw(bus->sdiodev, false, addr,
3019                                (u8 *)&sh_val, sizeof(u32));
3020         if (rv < 0)
3021                 return rv;
3022         console_index = le32_to_cpu(sh_val);
3023
3024         /* allocate buffer for console data */
3025         if (console_size <= CONSOLE_BUFFER_MAX)
3026                 conbuf = vzalloc(console_size+1);
3027
3028         if (!conbuf)
3029                 return -ENOMEM;
3030
3031         /* obtain the console data from device */
3032         conbuf[console_size] = '\0';
3033         rv = brcmf_sdiod_ramrw(bus->sdiodev, false, console_ptr, (u8 *)conbuf,
3034                                console_size);
3035         if (rv < 0)
3036                 goto done;
3037
3038         rv = seq_write(seq, conbuf + console_index,
3039                        console_size - console_index);
3040         if (rv < 0)
3041                 goto done;
3042
3043         if (console_index > 0)
3044                 rv = seq_write(seq, conbuf, console_index - 1);
3045
3046 done:
3047         vfree(conbuf);
3048         return rv;
3049 }
3050
3051 static int brcmf_sdio_trap_info(struct seq_file *seq, struct brcmf_sdio *bus,
3052                                 struct sdpcm_shared *sh)
3053 {
3054         int error;
3055         struct brcmf_trap_info tr;
3056
3057         if ((sh->flags & SDPCM_SHARED_TRAP) == 0) {
3058                 brcmf_dbg(INFO, "no trap in firmware\n");
3059                 return 0;
3060         }
3061
3062         error = brcmf_sdiod_ramrw(bus->sdiodev, false, sh->trap_addr, (u8 *)&tr,
3063                                   sizeof(struct brcmf_trap_info));
3064         if (error < 0)
3065                 return error;
3066
3067         seq_printf(seq,
3068                    "dongle trap info: type 0x%x @ epc 0x%08x\n"
3069                    "  cpsr 0x%08x spsr 0x%08x sp 0x%08x\n"
3070                    "  lr   0x%08x pc   0x%08x offset 0x%x\n"
3071                    "  r0   0x%08x r1   0x%08x r2 0x%08x r3 0x%08x\n"
3072                    "  r4   0x%08x r5   0x%08x r6 0x%08x r7 0x%08x\n",
3073                    le32_to_cpu(tr.type), le32_to_cpu(tr.epc),
3074                    le32_to_cpu(tr.cpsr), le32_to_cpu(tr.spsr),
3075                    le32_to_cpu(tr.r13), le32_to_cpu(tr.r14),
3076                    le32_to_cpu(tr.pc), sh->trap_addr,
3077                    le32_to_cpu(tr.r0), le32_to_cpu(tr.r1),
3078                    le32_to_cpu(tr.r2), le32_to_cpu(tr.r3),
3079                    le32_to_cpu(tr.r4), le32_to_cpu(tr.r5),
3080                    le32_to_cpu(tr.r6), le32_to_cpu(tr.r7));
3081
3082         return 0;
3083 }
3084
3085 static int brcmf_sdio_assert_info(struct seq_file *seq, struct brcmf_sdio *bus,
3086                                   struct sdpcm_shared *sh)
3087 {
3088         int error = 0;
3089         char file[80] = "?";
3090         char expr[80] = "<???>";
3091
3092         if ((sh->flags & SDPCM_SHARED_ASSERT_BUILT) == 0) {
3093                 brcmf_dbg(INFO, "firmware not built with -assert\n");
3094                 return 0;
3095         } else if ((sh->flags & SDPCM_SHARED_ASSERT) == 0) {
3096                 brcmf_dbg(INFO, "no assert in dongle\n");
3097                 return 0;
3098         }
3099
3100         sdio_claim_host(bus->sdiodev->func[1]);
3101         if (sh->assert_file_addr != 0) {
3102                 error = brcmf_sdiod_ramrw(bus->sdiodev, false,
3103                                           sh->assert_file_addr, (u8 *)file, 80);
3104                 if (error < 0)
3105                         return error;
3106         }
3107         if (sh->assert_exp_addr != 0) {
3108                 error = brcmf_sdiod_ramrw(bus->sdiodev, false,
3109                                           sh->assert_exp_addr, (u8 *)expr, 80);
3110                 if (error < 0)
3111                         return error;
3112         }
3113         sdio_release_host(bus->sdiodev->func[1]);
3114
3115         seq_printf(seq, "dongle assert: %s:%d: assert(%s)\n",
3116                    file, sh->assert_line, expr);
3117         return 0;
3118 }
3119
3120 static int brcmf_sdio_checkdied(struct brcmf_sdio *bus)
3121 {
3122         int error;
3123         struct sdpcm_shared sh;
3124
3125         error = brcmf_sdio_readshared(bus, &sh);
3126
3127         if (error < 0)
3128                 return error;
3129
3130         if ((sh.flags & SDPCM_SHARED_ASSERT_BUILT) == 0)
3131                 brcmf_dbg(INFO, "firmware not built with -assert\n");
3132         else if (sh.flags & SDPCM_SHARED_ASSERT)
3133                 brcmf_err("assertion in dongle\n");
3134
3135         if (sh.flags & SDPCM_SHARED_TRAP)
3136                 brcmf_err("firmware trap in dongle\n");
3137
3138         return 0;
3139 }
3140
3141 static int brcmf_sdio_died_dump(struct seq_file *seq, struct brcmf_sdio *bus)
3142 {
3143         int error = 0;
3144         struct sdpcm_shared sh;
3145
3146         error = brcmf_sdio_readshared(bus, &sh);
3147         if (error < 0)
3148                 goto done;
3149
3150         error = brcmf_sdio_assert_info(seq, bus, &sh);
3151         if (error < 0)
3152                 goto done;
3153
3154         error = brcmf_sdio_trap_info(seq, bus, &sh);
3155         if (error < 0)
3156                 goto done;
3157
3158         error = brcmf_sdio_dump_console(seq, bus, &sh);
3159
3160 done:
3161         return error;
3162 }
3163
3164 static int brcmf_sdio_forensic_read(struct seq_file *seq, void *data)
3165 {
3166         struct brcmf_bus *bus_if = dev_get_drvdata(seq->private);
3167         struct brcmf_sdio *bus = bus_if->bus_priv.sdio->bus;
3168
3169         return brcmf_sdio_died_dump(seq, bus);
3170 }
3171
3172 static int brcmf_debugfs_sdio_count_read(struct seq_file *seq, void *data)
3173 {
3174         struct brcmf_bus *bus_if = dev_get_drvdata(seq->private);
3175         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
3176         struct brcmf_sdio_count *sdcnt = &sdiodev->bus->sdcnt;
3177
3178         seq_printf(seq,
3179                    "intrcount:    %u\nlastintrs:    %u\n"
3180                    "pollcnt:      %u\nregfails:     %u\n"
3181                    "tx_sderrs:    %u\nfcqueued:     %u\n"
3182                    "rxrtx:        %u\nrx_toolong:   %u\n"
3183                    "rxc_errors:   %u\nrx_hdrfail:   %u\n"
3184                    "rx_badhdr:    %u\nrx_badseq:    %u\n"
3185                    "fc_rcvd:      %u\nfc_xoff:      %u\n"
3186                    "fc_xon:       %u\nrxglomfail:   %u\n"
3187                    "rxglomframes: %u\nrxglompkts:   %u\n"
3188                    "f2rxhdrs:     %u\nf2rxdata:     %u\n"
3189                    "f2txdata:     %u\nf1regdata:    %u\n"
3190                    "tickcnt:      %u\ntx_ctlerrs:   %lu\n"
3191                    "tx_ctlpkts:   %lu\nrx_ctlerrs:   %lu\n"
3192                    "rx_ctlpkts:   %lu\nrx_readahead: %lu\n",
3193                    sdcnt->intrcount, sdcnt->lastintrs,
3194                    sdcnt->pollcnt, sdcnt->regfails,
3195                    sdcnt->tx_sderrs, sdcnt->fcqueued,
3196                    sdcnt->rxrtx, sdcnt->rx_toolong,
3197                    sdcnt->rxc_errors, sdcnt->rx_hdrfail,
3198                    sdcnt->rx_badhdr, sdcnt->rx_badseq,
3199                    sdcnt->fc_rcvd, sdcnt->fc_xoff,
3200                    sdcnt->fc_xon, sdcnt->rxglomfail,
3201                    sdcnt->rxglomframes, sdcnt->rxglompkts,
3202                    sdcnt->f2rxhdrs, sdcnt->f2rxdata,
3203                    sdcnt->f2txdata, sdcnt->f1regdata,
3204                    sdcnt->tickcnt, sdcnt->tx_ctlerrs,
3205                    sdcnt->tx_ctlpkts, sdcnt->rx_ctlerrs,
3206                    sdcnt->rx_ctlpkts, sdcnt->rx_readahead_cnt);
3207
3208         return 0;
3209 }
3210
3211 static void brcmf_sdio_debugfs_create(struct brcmf_sdio *bus)
3212 {
3213         struct brcmf_pub *drvr = bus->sdiodev->bus_if->drvr;
3214         struct dentry *dentry = brcmf_debugfs_get_devdir(drvr);
3215
3216         if (IS_ERR_OR_NULL(dentry))
3217                 return;
3218
3219         brcmf_debugfs_add_entry(drvr, "forensics", brcmf_sdio_forensic_read);
3220         brcmf_debugfs_add_entry(drvr, "counters",
3221                                 brcmf_debugfs_sdio_count_read);
3222         debugfs_create_u32("console_interval", 0644, dentry,
3223                            &bus->console_interval);
3224 }
3225 #else
3226 static int brcmf_sdio_checkdied(struct brcmf_sdio *bus)
3227 {
3228         return 0;
3229 }
3230
3231 static void brcmf_sdio_debugfs_create(struct brcmf_sdio *bus)
3232 {
3233 }
3234 #endif /* DEBUG */
3235
3236 static int
3237 brcmf_sdio_bus_rxctl(struct device *dev, unsigned char *msg, uint msglen)
3238 {
3239         int timeleft;
3240         uint rxlen = 0;
3241         bool pending;
3242         u8 *buf;
3243         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
3244         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
3245         struct brcmf_sdio *bus = sdiodev->bus;
3246
3247         brcmf_dbg(TRACE, "Enter\n");
3248
3249         /* Wait until control frame is available */
3250         timeleft = brcmf_sdio_dcmd_resp_wait(bus, &bus->rxlen, &pending);
3251
3252         spin_lock_bh(&bus->rxctl_lock);
3253         rxlen = bus->rxlen;
3254         memcpy(msg, bus->rxctl, min(msglen, rxlen));
3255         bus->rxctl = NULL;
3256         buf = bus->rxctl_orig;
3257         bus->rxctl_orig = NULL;
3258         bus->rxlen = 0;
3259         spin_unlock_bh(&bus->rxctl_lock);
3260         vfree(buf);
3261
3262         if (rxlen) {
3263                 brcmf_dbg(CTL, "resumed on rxctl frame, got %d expected %d\n",
3264                           rxlen, msglen);
3265         } else if (timeleft == 0) {
3266                 brcmf_err("resumed on timeout\n");
3267                 brcmf_sdio_checkdied(bus);
3268         } else if (pending) {
3269                 brcmf_dbg(CTL, "cancelled\n");
3270                 return -ERESTARTSYS;
3271         } else {
3272                 brcmf_dbg(CTL, "resumed for unknown reason?\n");
3273                 brcmf_sdio_checkdied(bus);
3274         }
3275
3276         if (rxlen)
3277                 bus->sdcnt.rx_ctlpkts++;
3278         else
3279                 bus->sdcnt.rx_ctlerrs++;
3280
3281         return rxlen ? (int)rxlen : -ETIMEDOUT;
3282 }
3283
3284 #ifdef DEBUG
3285 static bool
3286 brcmf_sdio_verifymemory(struct brcmf_sdio_dev *sdiodev, u32 ram_addr,
3287                         u8 *ram_data, uint ram_sz)
3288 {
3289         char *ram_cmp;
3290         int err;
3291         bool ret = true;
3292         int address;
3293         int offset;
3294         int len;
3295
3296         /* read back and verify */
3297         brcmf_dbg(INFO, "Compare RAM dl & ul at 0x%08x; size=%d\n", ram_addr,
3298                   ram_sz);
3299         ram_cmp = kmalloc(MEMBLOCK, GFP_KERNEL);
3300         /* do not proceed while no memory but  */
3301         if (!ram_cmp)
3302                 return true;
3303
3304         address = ram_addr;
3305         offset = 0;
3306         while (offset < ram_sz) {
3307                 len = ((offset + MEMBLOCK) < ram_sz) ? MEMBLOCK :
3308                       ram_sz - offset;
3309                 err = brcmf_sdiod_ramrw(sdiodev, false, address, ram_cmp, len);
3310                 if (err) {
3311                         brcmf_err("error %d on reading %d membytes at 0x%08x\n",
3312                                   err, len, address);
3313                         ret = false;
3314                         break;
3315                 } else if (memcmp(ram_cmp, &ram_data[offset], len)) {
3316                         brcmf_err("Downloaded RAM image is corrupted, block offset is %d, len is %d\n",
3317                                   offset, len);
3318                         ret = false;
3319                         break;
3320                 }
3321                 offset += len;
3322                 address += len;
3323         }
3324
3325         kfree(ram_cmp);
3326
3327         return ret;
3328 }
3329 #else   /* DEBUG */
3330 static bool
3331 brcmf_sdio_verifymemory(struct brcmf_sdio_dev *sdiodev, u32 ram_addr,
3332                         u8 *ram_data, uint ram_sz)
3333 {
3334         return true;
3335 }
3336 #endif  /* DEBUG */
3337
3338 static int brcmf_sdio_download_code_file(struct brcmf_sdio *bus,
3339                                          const struct firmware *fw)
3340 {
3341         int err;
3342
3343         brcmf_dbg(TRACE, "Enter\n");
3344
3345         err = brcmf_sdiod_ramrw(bus->sdiodev, true, bus->ci->rambase,
3346                                 (u8 *)fw->data, fw->size);
3347         if (err)
3348                 brcmf_err("error %d on writing %d membytes at 0x%08x\n",
3349                           err, (int)fw->size, bus->ci->rambase);
3350         else if (!brcmf_sdio_verifymemory(bus->sdiodev, bus->ci->rambase,
3351                                           (u8 *)fw->data, fw->size))
3352                 err = -EIO;
3353
3354         return err;
3355 }
3356
3357 static int brcmf_sdio_download_nvram(struct brcmf_sdio *bus,
3358                                      void *vars, u32 varsz)
3359 {
3360         int address;
3361         int err;
3362
3363         brcmf_dbg(TRACE, "Enter\n");
3364
3365         address = bus->ci->ramsize - varsz + bus->ci->rambase;
3366         err = brcmf_sdiod_ramrw(bus->sdiodev, true, address, vars, varsz);
3367         if (err)
3368                 brcmf_err("error %d on writing %d nvram bytes at 0x%08x\n",
3369                           err, varsz, address);
3370         else if (!brcmf_sdio_verifymemory(bus->sdiodev, address, vars, varsz))
3371                 err = -EIO;
3372
3373         return err;
3374 }
3375
3376 static int brcmf_sdio_download_firmware(struct brcmf_sdio *bus,
3377                                         const struct firmware *fw,
3378                                         void *nvram, u32 nvlen)
3379 {
3380         int bcmerror = -EFAULT;
3381         u32 rstvec;
3382
3383         sdio_claim_host(bus->sdiodev->func[1]);
3384         brcmf_sdio_clkctl(bus, CLK_AVAIL, false);
3385
3386         /* Keep arm in reset */
3387         brcmf_chip_enter_download(bus->ci);
3388
3389         rstvec = get_unaligned_le32(fw->data);
3390         brcmf_dbg(SDIO, "firmware rstvec: %x\n", rstvec);
3391
3392         bcmerror = brcmf_sdio_download_code_file(bus, fw);
3393         release_firmware(fw);
3394         if (bcmerror) {
3395                 brcmf_err("dongle image file download failed\n");
3396                 brcmf_fw_nvram_free(nvram);
3397                 goto err;
3398         }
3399
3400         bcmerror = brcmf_sdio_download_nvram(bus, nvram, nvlen);
3401         brcmf_fw_nvram_free(nvram);
3402         if (bcmerror) {
3403                 brcmf_err("dongle nvram file download failed\n");
3404                 goto err;
3405         }
3406
3407         /* Take arm out of reset */
3408         if (!brcmf_chip_exit_download(bus->ci, rstvec)) {
3409                 brcmf_err("error getting out of ARM core reset\n");
3410                 goto err;
3411         }
3412
3413         /* Allow full data communication using DPC from now on. */
3414         bus->sdiodev->state = BRCMF_STATE_DATA;
3415         bcmerror = 0;
3416
3417 err:
3418         brcmf_sdio_clkctl(bus, CLK_SDONLY, false);
3419         sdio_release_host(bus->sdiodev->func[1]);
3420         return bcmerror;
3421 }
3422
3423 static void brcmf_sdio_sr_init(struct brcmf_sdio *bus)
3424 {
3425         int err = 0;
3426         u8 val;
3427
3428         brcmf_dbg(TRACE, "Enter\n");
3429
3430         val = brcmf_sdiod_regrb(bus->sdiodev, SBSDIO_FUNC1_WAKEUPCTRL, &err);
3431         if (err) {
3432                 brcmf_err("error reading SBSDIO_FUNC1_WAKEUPCTRL\n");
3433                 return;
3434         }
3435
3436         val |= 1 << SBSDIO_FUNC1_WCTRL_HTWAIT_SHIFT;
3437         brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_WAKEUPCTRL, val, &err);
3438         if (err) {
3439                 brcmf_err("error writing SBSDIO_FUNC1_WAKEUPCTRL\n");
3440                 return;
3441         }
3442
3443         /* Add CMD14 Support */
3444         brcmf_sdiod_regwb(bus->sdiodev, SDIO_CCCR_BRCM_CARDCAP,
3445                           (SDIO_CCCR_BRCM_CARDCAP_CMD14_SUPPORT |
3446                            SDIO_CCCR_BRCM_CARDCAP_CMD14_EXT),
3447                           &err);
3448         if (err) {
3449                 brcmf_err("error writing SDIO_CCCR_BRCM_CARDCAP\n");
3450                 return;
3451         }
3452
3453         brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
3454                           SBSDIO_FORCE_HT, &err);
3455         if (err) {
3456                 brcmf_err("error writing SBSDIO_FUNC1_CHIPCLKCSR\n");
3457                 return;
3458         }
3459
3460         /* set flag */
3461         bus->sr_enabled = true;
3462         brcmf_dbg(INFO, "SR enabled\n");
3463 }
3464
3465 /* enable KSO bit */
3466 static int brcmf_sdio_kso_init(struct brcmf_sdio *bus)
3467 {
3468         u8 val;
3469         int err = 0;
3470
3471         brcmf_dbg(TRACE, "Enter\n");
3472
3473         /* KSO bit added in SDIO core rev 12 */
3474         if (brcmf_chip_get_core(bus->ci, BCMA_CORE_SDIO_DEV)->rev < 12)
3475                 return 0;
3476
3477         val = brcmf_sdiod_regrb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR, &err);
3478         if (err) {
3479                 brcmf_err("error reading SBSDIO_FUNC1_SLEEPCSR\n");
3480                 return err;
3481         }
3482
3483         if (!(val & SBSDIO_FUNC1_SLEEPCSR_KSO_MASK)) {
3484                 val |= (SBSDIO_FUNC1_SLEEPCSR_KSO_EN <<
3485                         SBSDIO_FUNC1_SLEEPCSR_KSO_SHIFT);
3486                 brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_SLEEPCSR,
3487                                   val, &err);
3488                 if (err) {
3489                         brcmf_err("error writing SBSDIO_FUNC1_SLEEPCSR\n");
3490                         return err;
3491                 }
3492         }
3493
3494         return 0;
3495 }
3496
3497
3498 static int brcmf_sdio_bus_preinit(struct device *dev)
3499 {
3500         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
3501         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
3502         struct brcmf_sdio *bus = sdiodev->bus;
3503         uint pad_size;
3504         u32 value;
3505         int err;
3506
3507         /* the commands below use the terms tx and rx from
3508          * a device perspective, ie. bus:txglom affects the
3509          * bus transfers from device to host.
3510          */
3511         if (brcmf_chip_get_core(bus->ci, BCMA_CORE_SDIO_DEV)->rev < 12) {
3512                 /* for sdio core rev < 12, disable txgloming */
3513                 value = 0;
3514                 err = brcmf_iovar_data_set(dev, "bus:txglom", &value,
3515                                            sizeof(u32));
3516         } else {
3517                 /* otherwise, set txglomalign */
3518                 value = 4;
3519                 if (sdiodev->pdata)
3520                         value = sdiodev->pdata->sd_sgentry_align;
3521                 /* SDIO ADMA requires at least 32 bit alignment */
3522                 value = max_t(u32, value, 4);
3523                 err = brcmf_iovar_data_set(dev, "bus:txglomalign", &value,
3524                                            sizeof(u32));
3525         }
3526
3527         if (err < 0)
3528                 goto done;
3529
3530         bus->tx_hdrlen = SDPCM_HWHDR_LEN + SDPCM_SWHDR_LEN;
3531         if (sdiodev->sg_support) {
3532                 bus->txglom = false;
3533                 value = 1;
3534                 pad_size = bus->sdiodev->func[2]->cur_blksize << 1;
3535                 err = brcmf_iovar_data_set(bus->sdiodev->dev, "bus:rxglom",
3536                                            &value, sizeof(u32));
3537                 if (err < 0) {
3538                         /* bus:rxglom is allowed to fail */
3539                         err = 0;
3540                 } else {
3541                         bus->txglom = true;
3542                         bus->tx_hdrlen += SDPCM_HWEXT_LEN;
3543                 }
3544         }
3545         brcmf_bus_add_txhdrlen(bus->sdiodev->dev, bus->tx_hdrlen);
3546
3547 done:
3548         return err;
3549 }
3550
3551 void brcmf_sdio_isr(struct brcmf_sdio *bus)
3552 {
3553         brcmf_dbg(TRACE, "Enter\n");
3554
3555         if (!bus) {
3556                 brcmf_err("bus is null pointer, exiting\n");
3557                 return;
3558         }
3559
3560         if (bus->sdiodev->state != BRCMF_STATE_DATA) {
3561                 brcmf_err("bus is down. we have nothing to do\n");
3562                 return;
3563         }
3564         /* Count the interrupt call */
3565         bus->sdcnt.intrcount++;
3566         if (in_interrupt())
3567                 atomic_set(&bus->ipend, 1);
3568         else
3569                 if (brcmf_sdio_intr_rstatus(bus)) {
3570                         brcmf_err("failed backplane access\n");
3571                 }
3572
3573         /* Disable additional interrupts (is this needed now)? */
3574         if (!bus->intr)
3575                 brcmf_err("isr w/o interrupt configured!\n");
3576
3577         atomic_inc(&bus->dpc_tskcnt);
3578         queue_work(bus->brcmf_wq, &bus->datawork);
3579 }
3580
3581 static bool brcmf_sdio_bus_watchdog(struct brcmf_sdio *bus)
3582 {
3583         brcmf_dbg(TIMER, "Enter\n");
3584
3585         /* Poll period: check device if appropriate. */
3586         if (!bus->sr_enabled &&
3587             bus->poll && (++bus->polltick >= bus->pollrate)) {
3588                 u32 intstatus = 0;
3589
3590                 /* Reset poll tick */
3591                 bus->polltick = 0;
3592
3593                 /* Check device if no interrupts */
3594                 if (!bus->intr ||
3595                     (bus->sdcnt.intrcount == bus->sdcnt.lastintrs)) {
3596
3597                         if (atomic_read(&bus->dpc_tskcnt) == 0) {
3598                                 u8 devpend;
3599
3600                                 sdio_claim_host(bus->sdiodev->func[1]);
3601                                 devpend = brcmf_sdiod_regrb(bus->sdiodev,
3602                                                             SDIO_CCCR_INTx,
3603                                                             NULL);
3604                                 sdio_release_host(bus->sdiodev->func[1]);
3605                                 intstatus =
3606                                     devpend & (INTR_STATUS_FUNC1 |
3607                                                INTR_STATUS_FUNC2);
3608                         }
3609
3610                         /* If there is something, make like the ISR and
3611                                  schedule the DPC */
3612                         if (intstatus) {
3613                                 bus->sdcnt.pollcnt++;
3614                                 atomic_set(&bus->ipend, 1);
3615
3616                                 atomic_inc(&bus->dpc_tskcnt);
3617                                 queue_work(bus->brcmf_wq, &bus->datawork);
3618                         }
3619                 }
3620
3621                 /* Update interrupt tracking */
3622                 bus->sdcnt.lastintrs = bus->sdcnt.intrcount;
3623         }
3624 #ifdef DEBUG
3625         /* Poll for console output periodically */
3626         if (bus->sdiodev->state == BRCMF_STATE_DATA &&
3627             bus->console_interval != 0) {
3628                 bus->console.count += BRCMF_WD_POLL_MS;
3629                 if (bus->console.count >= bus->console_interval) {
3630                         bus->console.count -= bus->console_interval;
3631                         sdio_claim_host(bus->sdiodev->func[1]);
3632                         /* Make sure backplane clock is on */
3633                         brcmf_sdio_bus_sleep(bus, false, false);
3634                         if (brcmf_sdio_readconsole(bus) < 0)
3635                                 /* stop on error */
3636                                 bus->console_interval = 0;
3637                         sdio_release_host(bus->sdiodev->func[1]);
3638                 }
3639         }
3640 #endif                          /* DEBUG */
3641
3642         /* On idle timeout clear activity flag and/or turn off clock */
3643         if ((bus->idletime > 0) && (bus->clkstate == CLK_AVAIL)) {
3644                 if (++bus->idlecount >= bus->idletime) {
3645                         bus->idlecount = 0;
3646                         if (bus->activity) {
3647                                 bus->activity = false;
3648                                 brcmf_sdio_wd_timer(bus, BRCMF_WD_POLL_MS);
3649                         } else {
3650                                 brcmf_dbg(SDIO, "idle\n");
3651                                 sdio_claim_host(bus->sdiodev->func[1]);
3652                                 brcmf_sdio_bus_sleep(bus, true, false);
3653                                 sdio_release_host(bus->sdiodev->func[1]);
3654                         }
3655                 }
3656         }
3657
3658         return (atomic_read(&bus->ipend) > 0);
3659 }
3660
3661 static void brcmf_sdio_dataworker(struct work_struct *work)
3662 {
3663         struct brcmf_sdio *bus = container_of(work, struct brcmf_sdio,
3664                                               datawork);
3665
3666         while (atomic_read(&bus->dpc_tskcnt)) {
3667                 atomic_set(&bus->dpc_tskcnt, 0);
3668                 brcmf_sdio_dpc(bus);
3669         }
3670 }
3671
3672 static void
3673 brcmf_sdio_drivestrengthinit(struct brcmf_sdio_dev *sdiodev,
3674                              struct brcmf_chip *ci, u32 drivestrength)
3675 {
3676         const struct sdiod_drive_str *str_tab = NULL;
3677         u32 str_mask;
3678         u32 str_shift;
3679         u32 base;
3680         u32 i;
3681         u32 drivestrength_sel = 0;
3682         u32 cc_data_temp;
3683         u32 addr;
3684
3685         if (!(ci->cc_caps & CC_CAP_PMU))
3686                 return;
3687
3688         switch (SDIOD_DRVSTR_KEY(ci->chip, ci->pmurev)) {
3689         case SDIOD_DRVSTR_KEY(BRCM_CC_4330_CHIP_ID, 12):
3690                 str_tab = sdiod_drvstr_tab1_1v8;
3691                 str_mask = 0x00003800;
3692                 str_shift = 11;
3693                 break;
3694         case SDIOD_DRVSTR_KEY(BRCM_CC_4334_CHIP_ID, 17):
3695                 str_tab = sdiod_drvstr_tab6_1v8;
3696                 str_mask = 0x00001800;
3697                 str_shift = 11;
3698                 break;
3699         case SDIOD_DRVSTR_KEY(BRCM_CC_43143_CHIP_ID, 17):
3700                 /* note: 43143 does not support tristate */
3701                 i = ARRAY_SIZE(sdiod_drvstr_tab2_3v3) - 1;
3702                 if (drivestrength >= sdiod_drvstr_tab2_3v3[i].strength) {
3703                         str_tab = sdiod_drvstr_tab2_3v3;
3704                         str_mask = 0x00000007;
3705                         str_shift = 0;
3706                 } else
3707                         brcmf_err("Invalid SDIO Drive strength for chip %s, strength=%d\n",
3708                                   ci->name, drivestrength);
3709                 break;
3710         case SDIOD_DRVSTR_KEY(BRCM_CC_43362_CHIP_ID, 13):
3711                 str_tab = sdiod_drive_strength_tab5_1v8;
3712                 str_mask = 0x00003800;
3713                 str_shift = 11;
3714                 break;
3715         default:
3716                 brcmf_err("No SDIO Drive strength init done for chip %s rev %d pmurev %d\n",
3717                           ci->name, ci->chiprev, ci->pmurev);
3718                 break;
3719         }
3720
3721         if (str_tab != NULL) {
3722                 for (i = 0; str_tab[i].strength != 0; i++) {
3723                         if (drivestrength >= str_tab[i].strength) {
3724                                 drivestrength_sel = str_tab[i].sel;
3725                                 break;
3726                         }
3727                 }
3728                 base = brcmf_chip_get_chipcommon(ci)->base;
3729                 addr = CORE_CC_REG(base, chipcontrol_addr);
3730                 brcmf_sdiod_regwl(sdiodev, addr, 1, NULL);
3731                 cc_data_temp = brcmf_sdiod_regrl(sdiodev, addr, NULL);
3732                 cc_data_temp &= ~str_mask;
3733                 drivestrength_sel <<= str_shift;
3734                 cc_data_temp |= drivestrength_sel;
3735                 brcmf_sdiod_regwl(sdiodev, addr, cc_data_temp, NULL);
3736
3737                 brcmf_dbg(INFO, "SDIO: %d mA (req=%d mA) drive strength selected, set to 0x%08x\n",
3738                           str_tab[i].strength, drivestrength, cc_data_temp);
3739         }
3740 }
3741
3742 static int brcmf_sdio_buscoreprep(void *ctx)
3743 {
3744         struct brcmf_sdio_dev *sdiodev = ctx;
3745         int err = 0;
3746         u8 clkval, clkset;
3747
3748         /* Try forcing SDIO core to do ALPAvail request only */
3749         clkset = SBSDIO_FORCE_HW_CLKREQ_OFF | SBSDIO_ALP_AVAIL_REQ;
3750         brcmf_sdiod_regwb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, clkset, &err);
3751         if (err) {
3752                 brcmf_err("error writing for HT off\n");
3753                 return err;
3754         }
3755
3756         /* If register supported, wait for ALPAvail and then force ALP */
3757         /* This may take up to 15 milliseconds */
3758         clkval = brcmf_sdiod_regrb(sdiodev,
3759                                    SBSDIO_FUNC1_CHIPCLKCSR, NULL);
3760
3761         if ((clkval & ~SBSDIO_AVBITS) != clkset) {
3762                 brcmf_err("ChipClkCSR access: wrote 0x%02x read 0x%02x\n",
3763                           clkset, clkval);
3764                 return -EACCES;
3765         }
3766
3767         SPINWAIT(((clkval = brcmf_sdiod_regrb(sdiodev,
3768                                               SBSDIO_FUNC1_CHIPCLKCSR, NULL)),
3769                         !SBSDIO_ALPAV(clkval)),
3770                         PMU_MAX_TRANSITION_DLY);
3771         if (!SBSDIO_ALPAV(clkval)) {
3772                 brcmf_err("timeout on ALPAV wait, clkval 0x%02x\n",
3773                           clkval);
3774                 return -EBUSY;
3775         }
3776
3777         clkset = SBSDIO_FORCE_HW_CLKREQ_OFF | SBSDIO_FORCE_ALP;
3778         brcmf_sdiod_regwb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, clkset, &err);
3779         udelay(65);
3780
3781         /* Also, disable the extra SDIO pull-ups */
3782         brcmf_sdiod_regwb(sdiodev, SBSDIO_FUNC1_SDIOPULLUP, 0, NULL);
3783
3784         return 0;
3785 }
3786
3787 static void brcmf_sdio_buscore_exitdl(void *ctx, struct brcmf_chip *chip,
3788                                       u32 rstvec)
3789 {
3790         struct brcmf_sdio_dev *sdiodev = ctx;
3791         struct brcmf_core *core;
3792         u32 reg_addr;
3793
3794         /* clear all interrupts */
3795         core = brcmf_chip_get_core(chip, BCMA_CORE_SDIO_DEV);
3796         reg_addr = core->base + offsetof(struct sdpcmd_regs, intstatus);
3797         brcmf_sdiod_regwl(sdiodev, reg_addr, 0xFFFFFFFF, NULL);
3798
3799         if (rstvec)
3800                 /* Write reset vector to address 0 */
3801                 brcmf_sdiod_ramrw(sdiodev, true, 0, (void *)&rstvec,
3802                                   sizeof(rstvec));
3803 }
3804
3805 static u32 brcmf_sdio_buscore_read32(void *ctx, u32 addr)
3806 {
3807         struct brcmf_sdio_dev *sdiodev = ctx;
3808         u32 val, rev;
3809
3810         val = brcmf_sdiod_regrl(sdiodev, addr, NULL);
3811         if (sdiodev->func[0]->device == SDIO_DEVICE_ID_BROADCOM_4335_4339 &&
3812             addr == CORE_CC_REG(SI_ENUM_BASE, chipid)) {
3813                 rev = (val & CID_REV_MASK) >> CID_REV_SHIFT;
3814                 if (rev >= 2) {
3815                         val &= ~CID_ID_MASK;
3816                         val |= BRCM_CC_4339_CHIP_ID;
3817                 }
3818         }
3819         return val;
3820 }
3821
3822 static void brcmf_sdio_buscore_write32(void *ctx, u32 addr, u32 val)
3823 {
3824         struct brcmf_sdio_dev *sdiodev = ctx;
3825
3826         brcmf_sdiod_regwl(sdiodev, addr, val, NULL);
3827 }
3828
3829 static const struct brcmf_buscore_ops brcmf_sdio_buscore_ops = {
3830         .prepare = brcmf_sdio_buscoreprep,
3831         .exit_dl = brcmf_sdio_buscore_exitdl,
3832         .read32 = brcmf_sdio_buscore_read32,
3833         .write32 = brcmf_sdio_buscore_write32,
3834 };
3835
3836 static bool
3837 brcmf_sdio_probe_attach(struct brcmf_sdio *bus)
3838 {
3839         u8 clkctl = 0;
3840         int err = 0;
3841         int reg_addr;
3842         u32 reg_val;
3843         u32 drivestrength;
3844
3845         sdio_claim_host(bus->sdiodev->func[1]);
3846
3847         pr_debug("F1 signature read @0x18000000=0x%4x\n",
3848                  brcmf_sdiod_regrl(bus->sdiodev, SI_ENUM_BASE, NULL));
3849
3850         /*
3851          * Force PLL off until brcmf_chip_attach()
3852          * programs PLL control regs
3853          */
3854
3855         brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
3856                           BRCMF_INIT_CLKCTL1, &err);
3857         if (!err)
3858                 clkctl = brcmf_sdiod_regrb(bus->sdiodev,
3859                                            SBSDIO_FUNC1_CHIPCLKCSR, &err);
3860
3861         if (err || ((clkctl & ~SBSDIO_AVBITS) != BRCMF_INIT_CLKCTL1)) {
3862                 brcmf_err("ChipClkCSR access: err %d wrote 0x%02x read 0x%02x\n",
3863                           err, BRCMF_INIT_CLKCTL1, clkctl);
3864                 goto fail;
3865         }
3866
3867         bus->ci = brcmf_chip_attach(bus->sdiodev, &brcmf_sdio_buscore_ops);
3868         if (IS_ERR(bus->ci)) {
3869                 brcmf_err("brcmf_chip_attach failed!\n");
3870                 bus->ci = NULL;
3871                 goto fail;
3872         }
3873
3874         if (brcmf_sdio_kso_init(bus)) {
3875                 brcmf_err("error enabling KSO\n");
3876                 goto fail;
3877         }
3878
3879         if ((bus->sdiodev->pdata) && (bus->sdiodev->pdata->drive_strength))
3880                 drivestrength = bus->sdiodev->pdata->drive_strength;
3881         else
3882                 drivestrength = DEFAULT_SDIO_DRIVE_STRENGTH;
3883         brcmf_sdio_drivestrengthinit(bus->sdiodev, bus->ci, drivestrength);
3884
3885         /* Get info on the SOCRAM cores... */
3886         bus->ramsize = bus->ci->ramsize;
3887         if (!(bus->ramsize)) {
3888                 brcmf_err("failed to find SOCRAM memory!\n");
3889                 goto fail;
3890         }
3891
3892         /* Set card control so an SDIO card reset does a WLAN backplane reset */
3893         reg_val = brcmf_sdiod_regrb(bus->sdiodev,
3894                                     SDIO_CCCR_BRCM_CARDCTRL, &err);
3895         if (err)
3896                 goto fail;
3897
3898         reg_val |= SDIO_CCCR_BRCM_CARDCTRL_WLANRESET;
3899
3900         brcmf_sdiod_regwb(bus->sdiodev,
3901                           SDIO_CCCR_BRCM_CARDCTRL, reg_val, &err);
3902         if (err)
3903                 goto fail;
3904
3905         /* set PMUControl so a backplane reset does PMU state reload */
3906         reg_addr = CORE_CC_REG(brcmf_chip_get_chipcommon(bus->ci)->base,
3907                                pmucontrol);
3908         reg_val = brcmf_sdiod_regrl(bus->sdiodev, reg_addr, &err);
3909         if (err)
3910                 goto fail;
3911
3912         reg_val |= (BCMA_CC_PMU_CTL_RES_RELOAD << BCMA_CC_PMU_CTL_RES_SHIFT);
3913
3914         brcmf_sdiod_regwl(bus->sdiodev, reg_addr, reg_val, &err);
3915         if (err)
3916                 goto fail;
3917
3918         sdio_release_host(bus->sdiodev->func[1]);
3919
3920         brcmu_pktq_init(&bus->txq, (PRIOMASK + 1), TXQLEN);
3921
3922         /* allocate header buffer */
3923         bus->hdrbuf = kzalloc(MAX_HDR_READ + bus->head_align, GFP_KERNEL);
3924         if (!bus->hdrbuf)
3925                 return false;
3926         /* Locate an appropriately-aligned portion of hdrbuf */
3927         bus->rxhdr = (u8 *) roundup((unsigned long)&bus->hdrbuf[0],
3928                                     bus->head_align);
3929
3930         /* Set the poll and/or interrupt flags */
3931         bus->intr = true;
3932         bus->poll = false;
3933         if (bus->poll)
3934                 bus->pollrate = 1;
3935
3936         return true;
3937
3938 fail:
3939         sdio_release_host(bus->sdiodev->func[1]);
3940         return false;
3941 }
3942
3943 static int
3944 brcmf_sdio_watchdog_thread(void *data)
3945 {
3946         struct brcmf_sdio *bus = (struct brcmf_sdio *)data;
3947
3948         allow_signal(SIGTERM);
3949         /* Run until signal received */
3950         while (1) {
3951                 if (kthread_should_stop())
3952                         break;
3953                 if (!wait_for_completion_interruptible(&bus->watchdog_wait)) {
3954                         brcmf_sdio_bus_watchdog(bus);
3955                         /* Count the tick for reference */
3956                         bus->sdcnt.tickcnt++;
3957                         reinit_completion(&bus->watchdog_wait);
3958                 } else
3959                         break;
3960         }
3961         return 0;
3962 }
3963
3964 static void
3965 brcmf_sdio_watchdog(unsigned long data)
3966 {
3967         struct brcmf_sdio *bus = (struct brcmf_sdio *)data;
3968
3969         if (bus->watchdog_tsk) {
3970                 complete(&bus->watchdog_wait);
3971                 /* Reschedule the watchdog */
3972                 if (bus->wd_timer_valid)
3973                         mod_timer(&bus->timer,
3974                                   jiffies + msecs_to_jiffies(BRCMF_WD_POLL_MS));
3975         }
3976 }
3977
3978 static struct brcmf_bus_ops brcmf_sdio_bus_ops = {
3979         .stop = brcmf_sdio_bus_stop,
3980         .preinit = brcmf_sdio_bus_preinit,
3981         .txdata = brcmf_sdio_bus_txdata,
3982         .txctl = brcmf_sdio_bus_txctl,
3983         .rxctl = brcmf_sdio_bus_rxctl,
3984         .gettxq = brcmf_sdio_bus_gettxq,
3985         .wowl_config = brcmf_sdio_wowl_config
3986 };
3987
3988 static void brcmf_sdio_firmware_callback(struct device *dev,
3989                                          const struct firmware *code,
3990                                          void *nvram, u32 nvram_len)
3991 {
3992         struct brcmf_bus *bus_if = dev_get_drvdata(dev);
3993         struct brcmf_sdio_dev *sdiodev = bus_if->bus_priv.sdio;
3994         struct brcmf_sdio *bus = sdiodev->bus;
3995         int err = 0;
3996         u8 saveclk;
3997
3998         brcmf_dbg(TRACE, "Enter: dev=%s\n", dev_name(dev));
3999
4000         if (!bus_if->drvr)
4001                 return;
4002
4003         /* try to download image and nvram to the dongle */
4004         bus->alp_only = true;
4005         err = brcmf_sdio_download_firmware(bus, code, nvram, nvram_len);
4006         if (err)
4007                 goto fail;
4008         bus->alp_only = false;
4009
4010         /* Start the watchdog timer */
4011         bus->sdcnt.tickcnt = 0;
4012         brcmf_sdio_wd_timer(bus, BRCMF_WD_POLL_MS);
4013
4014         sdio_claim_host(sdiodev->func[1]);
4015
4016         /* Make sure backplane clock is on, needed to generate F2 interrupt */
4017         brcmf_sdio_clkctl(bus, CLK_AVAIL, false);
4018         if (bus->clkstate != CLK_AVAIL)
4019                 goto release;
4020
4021         /* Force clocks on backplane to be sure F2 interrupt propagates */
4022         saveclk = brcmf_sdiod_regrb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, &err);
4023         if (!err) {
4024                 brcmf_sdiod_regwb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
4025                                   (saveclk | SBSDIO_FORCE_HT), &err);
4026         }
4027         if (err) {
4028                 brcmf_err("Failed to force clock for F2: err %d\n", err);
4029                 goto release;
4030         }
4031
4032         /* Enable function 2 (frame transfers) */
4033         w_sdreg32(bus, SDPCM_PROT_VERSION << SMB_DATA_VERSION_SHIFT,
4034                   offsetof(struct sdpcmd_regs, tosbmailboxdata));
4035         err = sdio_enable_func(sdiodev->func[SDIO_FUNC_2]);
4036
4037
4038         brcmf_dbg(INFO, "enable F2: err=%d\n", err);
4039
4040         /* If F2 successfully enabled, set core and enable interrupts */
4041         if (!err) {
4042                 /* Set up the interrupt mask and enable interrupts */
4043                 bus->hostintmask = HOSTINTMASK;
4044                 w_sdreg32(bus, bus->hostintmask,
4045                           offsetof(struct sdpcmd_regs, hostintmask));
4046
4047                 brcmf_sdiod_regwb(sdiodev, SBSDIO_WATERMARK, 8, &err);
4048         } else {
4049                 /* Disable F2 again */
4050                 sdio_disable_func(sdiodev->func[SDIO_FUNC_2]);
4051                 goto release;
4052         }
4053
4054         if (brcmf_chip_sr_capable(bus->ci)) {
4055                 brcmf_sdio_sr_init(bus);
4056         } else {
4057                 /* Restore previous clock setting */
4058                 brcmf_sdiod_regwb(sdiodev, SBSDIO_FUNC1_CHIPCLKCSR,
4059                                   saveclk, &err);
4060         }
4061
4062         if (err == 0) {
4063                 err = brcmf_sdiod_intr_register(sdiodev);
4064                 if (err != 0)
4065                         brcmf_err("intr register failed:%d\n", err);
4066         }
4067
4068         /* If we didn't come up, turn off backplane clock */
4069         if (err != 0)
4070                 brcmf_sdio_clkctl(bus, CLK_NONE, false);
4071
4072         sdio_release_host(sdiodev->func[1]);
4073
4074         err = brcmf_bus_start(dev);
4075         if (err != 0) {
4076                 brcmf_err("dongle is not responding\n");
4077                 goto fail;
4078         }
4079         return;
4080
4081 release:
4082         sdio_release_host(sdiodev->func[1]);
4083 fail:
4084         brcmf_dbg(TRACE, "failed: dev=%s, err=%d\n", dev_name(dev), err);
4085         device_release_driver(dev);
4086 }
4087
4088 struct brcmf_sdio *brcmf_sdio_probe(struct brcmf_sdio_dev *sdiodev)
4089 {
4090         int ret;
4091         struct brcmf_sdio *bus;
4092
4093         brcmf_dbg(TRACE, "Enter\n");
4094
4095         /* Allocate private bus interface state */
4096         bus = kzalloc(sizeof(struct brcmf_sdio), GFP_ATOMIC);
4097         if (!bus)
4098                 goto fail;
4099
4100         bus->sdiodev = sdiodev;
4101         sdiodev->bus = bus;
4102         skb_queue_head_init(&bus->glom);
4103         bus->txbound = BRCMF_TXBOUND;
4104         bus->rxbound = BRCMF_RXBOUND;
4105         bus->txminmax = BRCMF_TXMINMAX;
4106         bus->tx_seq = SDPCM_SEQ_WRAP - 1;
4107
4108         /* platform specific configuration:
4109          *   alignments must be at least 4 bytes for ADMA
4110          */
4111         bus->head_align = ALIGNMENT;
4112         bus->sgentry_align = ALIGNMENT;
4113         if (sdiodev->pdata) {
4114                 if (sdiodev->pdata->sd_head_align > ALIGNMENT)
4115                         bus->head_align = sdiodev->pdata->sd_head_align;
4116                 if (sdiodev->pdata->sd_sgentry_align > ALIGNMENT)
4117                         bus->sgentry_align = sdiodev->pdata->sd_sgentry_align;
4118         }
4119
4120         INIT_WORK(&bus->datawork, brcmf_sdio_dataworker);
4121         bus->brcmf_wq = create_singlethread_workqueue("brcmf_wq");
4122         if (bus->brcmf_wq == NULL) {
4123                 brcmf_err("insufficient memory to create txworkqueue\n");
4124                 goto fail;
4125         }
4126
4127         /* attempt to attach to the dongle */
4128         if (!(brcmf_sdio_probe_attach(bus))) {
4129                 brcmf_err("brcmf_sdio_probe_attach failed\n");
4130                 goto fail;
4131         }
4132
4133         spin_lock_init(&bus->rxctl_lock);
4134         spin_lock_init(&bus->txq_lock);
4135         init_waitqueue_head(&bus->ctrl_wait);
4136         init_waitqueue_head(&bus->dcmd_resp_wait);
4137
4138         /* Set up the watchdog timer */
4139         init_timer(&bus->timer);
4140         bus->timer.data = (unsigned long)bus;
4141         bus->timer.function = brcmf_sdio_watchdog;
4142
4143         /* Initialize watchdog thread */
4144         init_completion(&bus->watchdog_wait);
4145         bus->watchdog_tsk = kthread_run(brcmf_sdio_watchdog_thread,
4146                                         bus, "brcmf_watchdog");
4147         if (IS_ERR(bus->watchdog_tsk)) {
4148                 pr_warn("brcmf_watchdog thread failed to start\n");
4149                 bus->watchdog_tsk = NULL;
4150         }
4151         /* Initialize DPC thread */
4152         atomic_set(&bus->dpc_tskcnt, 0);
4153
4154         /* Assign bus interface call back */
4155         bus->sdiodev->bus_if->dev = bus->sdiodev->dev;
4156         bus->sdiodev->bus_if->ops = &brcmf_sdio_bus_ops;
4157         bus->sdiodev->bus_if->chip = bus->ci->chip;
4158         bus->sdiodev->bus_if->chiprev = bus->ci->chiprev;
4159
4160         /* default sdio bus header length for tx packet */
4161         bus->tx_hdrlen = SDPCM_HWHDR_LEN + SDPCM_SWHDR_LEN;
4162
4163         /* Attach to the common layer, reserve hdr space */
4164         ret = brcmf_attach(bus->sdiodev->dev);
4165         if (ret != 0) {
4166                 brcmf_err("brcmf_attach failed\n");
4167                 goto fail;
4168         }
4169
4170         /* Query the F2 block size, set roundup accordingly */
4171         bus->blocksize = bus->sdiodev->func[2]->cur_blksize;
4172         bus->roundup = min(max_roundup, bus->blocksize);
4173
4174         /* Allocate buffers */
4175         if (bus->sdiodev->bus_if->maxctl) {
4176                 bus->sdiodev->bus_if->maxctl += bus->roundup;
4177                 bus->rxblen =
4178                     roundup((bus->sdiodev->bus_if->maxctl + SDPCM_HDRLEN),
4179                             ALIGNMENT) + bus->head_align;
4180                 bus->rxbuf = kmalloc(bus->rxblen, GFP_ATOMIC);
4181                 if (!(bus->rxbuf)) {
4182                         brcmf_err("rxbuf allocation failed\n");
4183                         goto fail;
4184                 }
4185         }
4186
4187         sdio_claim_host(bus->sdiodev->func[1]);
4188
4189         /* Disable F2 to clear any intermediate frame state on the dongle */
4190         sdio_disable_func(bus->sdiodev->func[SDIO_FUNC_2]);
4191
4192         bus->rxflow = false;
4193
4194         /* Done with backplane-dependent accesses, can drop clock... */
4195         brcmf_sdiod_regwb(bus->sdiodev, SBSDIO_FUNC1_CHIPCLKCSR, 0, NULL);
4196
4197         sdio_release_host(bus->sdiodev->func[1]);
4198
4199         /* ...and initialize clock/power states */
4200         bus->clkstate = CLK_SDONLY;
4201         bus->idletime = BRCMF_IDLE_INTERVAL;
4202         bus->idleclock = BRCMF_IDLE_ACTIVE;
4203
4204         /* SR state */
4205         bus->sr_enabled = false;
4206
4207         brcmf_sdio_debugfs_create(bus);
4208         brcmf_dbg(INFO, "completed!!\n");
4209
4210         ret = brcmf_sdio_get_fwnames(bus->ci, sdiodev);
4211         if (ret)
4212                 goto fail;
4213
4214         ret = brcmf_fw_get_firmwares(sdiodev->dev, BRCMF_FW_REQUEST_NVRAM,
4215                                      sdiodev->fw_name, sdiodev->nvram_name,
4216                                      brcmf_sdio_firmware_callback);
4217         if (ret != 0) {
4218                 brcmf_err("async firmware request failed: %d\n", ret);
4219                 goto fail;
4220         }
4221
4222         return bus;
4223
4224 fail:
4225         brcmf_sdio_remove(bus);
4226         return NULL;
4227 }
4228
4229 /* Detach and free everything */
4230 void brcmf_sdio_remove(struct brcmf_sdio *bus)
4231 {
4232         brcmf_dbg(TRACE, "Enter\n");
4233
4234         if (bus) {
4235                 /* De-register interrupt handler */
4236                 brcmf_sdiod_intr_unregister(bus->sdiodev);
4237
4238                 brcmf_detach(bus->sdiodev->dev);
4239
4240                 cancel_work_sync(&bus->datawork);
4241                 if (bus->brcmf_wq)
4242                         destroy_workqueue(bus->brcmf_wq);
4243
4244                 if (bus->ci) {
4245                         if (bus->sdiodev->state != BRCMF_STATE_NOMEDIUM) {
4246                                 sdio_claim_host(bus->sdiodev->func[1]);
4247                                 brcmf_sdio_clkctl(bus, CLK_AVAIL, false);
4248                                 /* Leave the device in state where it is
4249                                  * 'quiet'. This is done by putting it in
4250                                  * download_state which essentially resets
4251                                  * all necessary cores.
4252                                  */
4253                                 msleep(20);
4254                                 brcmf_chip_enter_download(bus->ci);
4255                                 brcmf_sdio_clkctl(bus, CLK_NONE, false);
4256                                 sdio_release_host(bus->sdiodev->func[1]);
4257                         }
4258                         brcmf_chip_detach(bus->ci);
4259                 }
4260
4261                 kfree(bus->rxbuf);
4262                 kfree(bus->hdrbuf);
4263                 kfree(bus);
4264         }
4265
4266         brcmf_dbg(TRACE, "Disconnected\n");
4267 }
4268
4269 void brcmf_sdio_wd_timer(struct brcmf_sdio *bus, uint wdtick)
4270 {
4271         /* Totally stop the timer */
4272         if (!wdtick && bus->wd_timer_valid) {
4273                 del_timer_sync(&bus->timer);
4274                 bus->wd_timer_valid = false;
4275                 bus->save_ms = wdtick;
4276                 return;
4277         }
4278
4279         /* don't start the wd until fw is loaded */
4280         if (bus->sdiodev->state != BRCMF_STATE_DATA)
4281                 return;
4282
4283         if (wdtick) {
4284                 if (bus->save_ms != BRCMF_WD_POLL_MS) {
4285                         if (bus->wd_timer_valid)
4286                                 /* Stop timer and restart at new value */
4287                                 del_timer_sync(&bus->timer);
4288
4289                         /* Create timer again when watchdog period is
4290                            dynamically changed or in the first instance
4291                          */
4292                         bus->timer.expires =
4293                                 jiffies + msecs_to_jiffies(BRCMF_WD_POLL_MS);
4294                         add_timer(&bus->timer);
4295
4296                 } else {
4297                         /* Re arm the timer, at last watchdog period */
4298                         mod_timer(&bus->timer,
4299                                 jiffies + msecs_to_jiffies(BRCMF_WD_POLL_MS));
4300                 }
4301
4302                 bus->wd_timer_valid = true;
4303                 bus->save_ms = wdtick;
4304         }
4305 }