drivers/dma/imx-sdma.c

   1 /*
   2  * drivers/dma/imx-sdma.c
   3  *
   4  * This file contains a driver for the Freescale Smart DMA engine
   5  *
   6  * Copyright 2010 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
   7  *
   8  * Based on code from Freescale:
   9  *
  10  * Copyright 2004-2009 Freescale Semiconductor, Inc. All Rights Reserved.
  11  *
  12  * The code contained herein is licensed under the GNU General Public
  13  * License. You may obtain a copy of the GNU General Public License
  14  * Version 2 or later at the following locations:
  15  *
  16  * http://www.opensource.org/licenses/gpl-license.html
  17  * http://www.gnu.org/copyleft/gpl.html
  18  */
  19
  20 #include <linux/init.h>
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23 #include <linux/bitops.h>
  24 #include <linux/mm.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/clk.h>
  27 #include <linux/delay.h>
  28 #include <linux/sched.h>
  29 #include <linux/semaphore.h>
  30 #include <linux/spinlock.h>
  31 #include <linux/device.h>
  32 #include <linux/dma-mapping.h>
  33 #include <linux/firmware.h>
  34 #include <linux/slab.h>
  35 #include <linux/platform_device.h>
  36 #include <linux/dmaengine.h>
  37 #include <linux/of.h>
  38 #include <linux/of_address.h>
  39 #include <linux/of_device.h>
  40 #include <linux/of_dma.h>
  41
  42 #include <asm/irq.h>
  43 #include <linux/platform_data/dma-imx-sdma.h>
  44 #include <linux/platform_data/dma-imx.h>
  45 #include <linux/regmap.h>
  46 #include <linux/mfd/syscon.h>
  47 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
  48
  49 #include "dmaengine.h"
  50
  51 /* SDMA registers */
  52 #define SDMA_H_C0PTR            0x000
  53 #define SDMA_H_INTR             0x004
  54 #define SDMA_H_STATSTOP         0x008
  55 #define SDMA_H_START            0x00c
  56 #define SDMA_H_EVTOVR           0x010
  57 #define SDMA_H_DSPOVR           0x014
  58 #define SDMA_H_HOSTOVR          0x018
  59 #define SDMA_H_EVTPEND          0x01c
  60 #define SDMA_H_DSPENBL          0x020
  61 #define SDMA_H_RESET            0x024
  62 #define SDMA_H_EVTERR           0x028
  63 #define SDMA_H_INTRMSK          0x02c
  64 #define SDMA_H_PSW              0x030
  65 #define SDMA_H_EVTERRDBG        0x034
  66 #define SDMA_H_CONFIG           0x038
  67 #define SDMA_ONCE_ENB           0x040
  68 #define SDMA_ONCE_DATA          0x044
  69 #define SDMA_ONCE_INSTR         0x048
  70 #define SDMA_ONCE_STAT          0x04c
  71 #define SDMA_ONCE_CMD           0x050
  72 #define SDMA_EVT_MIRROR         0x054
  73 #define SDMA_ILLINSTADDR        0x058
  74 #define SDMA_CHN0ADDR           0x05c
  75 #define SDMA_ONCE_RTB           0x060
  76 #define SDMA_XTRIG_CONF1        0x070
  77 #define SDMA_XTRIG_CONF2        0x074
  78 #define SDMA_CHNENBL0_IMX35     0x200
  79 #define SDMA_CHNENBL0_IMX31     0x080
  80 #define SDMA_CHNPRI_0           0x100
  81
  82 /*
  83  * Buffer descriptor status values.
  84  */
  85 #define BD_DONE  0x01
  86 #define BD_WRAP  0x02
  87 #define BD_CONT  0x04
  88 #define BD_INTR  0x08
  89 #define BD_RROR  0x10
  90 #define BD_LAST  0x20
  91 #define BD_EXTD  0x80
  92
  93 /*
  94  * Data Node descriptor status values.
  95  */
  96 #define DND_END_OF_FRAME  0x80
  97 #define DND_END_OF_XFER   0x40
  98 #define DND_DONE          0x20
  99 #define DND_UNUSED        0x01
 100
 101 /*
 102  * IPCV2 descriptor status values.
 103  */
 104 #define BD_IPCV2_END_OF_FRAME  0x40
 105
 106 #define IPCV2_MAX_NODES        50
 107 /*
 108  * Error bit set in the CCB status field by the SDMA,
 109  * in setbd routine, in case of a transfer error
 110  */
 111 #define DATA_ERROR  0x10000000
 112
 113 /*
 114  * Buffer descriptor commands.
 115  */
 116 #define C0_ADDR             0x01
 117 #define C0_LOAD             0x02
 118 #define C0_DUMP             0x03
 119 #define C0_SETCTX           0x07
 120 #define C0_GETCTX           0x03
 121 #define C0_SETDM            0x01
 122 #define C0_SETPM            0x04
 123 #define C0_GETDM            0x02
 124 #define C0_GETPM            0x08
 125 /*
 126  * Change endianness indicator in the BD command field
 127  */
 128 #define CHANGE_ENDIANNESS   0x80
 129
 130 /*
 131  *  p_2_p watermark_level description
 132  *      Bits            Name                    Description
 133  *      0-7             Lower WML               Lower watermark level
 134  *      8               PS                      1: Pad Swallowing
 135  *                                              0: No Pad Swallowing
 136  *      9               PA                      1: Pad Adding
 137  *                                              0: No Pad Adding
 138  *      10              SPDIF                   If this bit is set both source
 139  *                                              and destination are on SPBA
 140  *      11              Source Bit(SP)          1: Source on SPBA
 141  *                                              0: Source on AIPS
 142  *      12              Destination Bit(DP)     1: Destination on SPBA
 143  *                                              0: Destination on AIPS
 144  *      13-15           ---------               MUST BE 0
 145  *      16-23           Higher WML              HWML
 146  *      24-27           N                       Total number of samples after
 147  *                                              which Pad adding/Swallowing
 148  *                                              must be done. It must be odd.
 149  *      28              Lower WML Event(LWE)    SDMA events reg to check for
 150  *                                              LWML event mask
 151  *                                              0: LWE in EVENTS register
 152  *                                              1: LWE in EVENTS2 register
 153  *      29              Higher WML Event(HWE)   SDMA events reg to check for
 154  *                                              HWML event mask
 155  *                                              0: HWE in EVENTS register
 156  *                                              1: HWE in EVENTS2 register
 157  *      30              ---------               MUST BE 0
 158  *      31              CONT                    1: Amount of samples to be
 159  *                                              transferred is unknown and
 160  *                                              script will keep on
 161  *                                              transferring samples as long as
 162  *                                              both events are detected and
 163  *                                              script must be manually stopped
 164  *                                              by the application
 165  *                                              0: The amount of samples to be
 166  *                                              transferred is equal to the
 167  *                                              count field of mode word
 168  */
 169 #define SDMA_WATERMARK_LEVEL_LWML       0xFF
 170 #define SDMA_WATERMARK_LEVEL_PS         BIT(8)
 171 #define SDMA_WATERMARK_LEVEL_PA         BIT(9)
 172 #define SDMA_WATERMARK_LEVEL_SPDIF      BIT(10)
 173 #define SDMA_WATERMARK_LEVEL_SP         BIT(11)
 174 #define SDMA_WATERMARK_LEVEL_DP         BIT(12)
 175 #define SDMA_WATERMARK_LEVEL_HWML       (0xFF << 16)
 176 #define SDMA_WATERMARK_LEVEL_LWE        BIT(28)
 177 #define SDMA_WATERMARK_LEVEL_HWE        BIT(29)
 178 #define SDMA_WATERMARK_LEVEL_CONT       BIT(31)
 179
 180 /*
 181  * Mode/Count of data node descriptors - IPCv2
 182  */
 183 struct sdma_mode_count {
 184         u32 count   : 16; /* size of the buffer pointed by this BD */
 185         u32 status  :  8; /* E,R,I,C,W,D status bits stored here */
 186         u32 command :  8; /* command mostlky used for channel 0 */
 187 };
 188
 189 /*
 190  * Buffer descriptor
 191  */
 192 struct sdma_buffer_descriptor {
 193         struct sdma_mode_count  mode;
 194         u32 buffer_addr;        /* address of the buffer described */
 195         u32 ext_buffer_addr;    /* extended buffer address */
 196 } __attribute__ ((packed));
 197
 198 /**
 199  * struct sdma_channel_control - Channel control Block
 200  *
 201  * @current_bd_ptr      current buffer descriptor processed
 202  * @base_bd_ptr         first element of buffer descriptor array
 203  * @unused              padding. The SDMA engine expects an array of 128 byte
 204  *                      control blocks
 205  */
 206 struct sdma_channel_control {
 207         u32 current_bd_ptr;
 208         u32 base_bd_ptr;
 209         u32 unused[2];
 210 } __attribute__ ((packed));
 211
 212 /**
 213  * struct sdma_state_registers - SDMA context for a channel
 214  *
 215  * @pc:         program counter
 216  * @t:          test bit: status of arithmetic & test instruction
 217  * @rpc:        return program counter
 218  * @sf:         source fault while loading data
 219  * @spc:        loop start program counter
 220  * @df:         destination fault while storing data
 221  * @epc:        loop end program counter
 222  * @lm:         loop mode
 223  */
 224 struct sdma_state_registers {
 225         u32 pc     :14;
 226         u32 unused1: 1;
 227         u32 t      : 1;
 228         u32 rpc    :14;
 229         u32 unused0: 1;
 230         u32 sf     : 1;
 231         u32 spc    :14;
 232         u32 unused2: 1;
 233         u32 df     : 1;
 234         u32 epc    :14;
 235         u32 lm     : 2;
 236 } __attribute__ ((packed));
 237
 238 /**
 239  * struct sdma_context_data - sdma context specific to a channel
 240  *
 241  * @channel_state:      channel state bits
 242  * @gReg:               general registers
 243  * @mda:                burst dma destination address register
 244  * @msa:                burst dma source address register
 245  * @ms:                 burst dma status register
 246  * @md:                 burst dma data register
 247  * @pda:                peripheral dma destination address register
 248  * @psa:                peripheral dma source address register
 249  * @ps:                 peripheral dma status register
 250  * @pd:                 peripheral dma data register
 251  * @ca:                 CRC polynomial register
 252  * @cs:                 CRC accumulator register
 253  * @dda:                dedicated core destination address register
 254  * @dsa:                dedicated core source address register
 255  * @ds:                 dedicated core status register
 256  * @dd:                 dedicated core data register
 257  */
 258 struct sdma_context_data {
 259         struct sdma_state_registers  channel_state;
 260         u32  gReg[8];
 261         u32  mda;
 262         u32  msa;
 263         u32  ms;
 264         u32  md;
 265         u32  pda;
 266         u32  psa;
 267         u32  ps;
 268         u32  pd;
 269         u32  ca;
 270         u32  cs;
 271         u32  dda;
 272         u32  dsa;
 273         u32  ds;
 274         u32  dd;
 275         u32  scratch0;
 276         u32  scratch1;
 277         u32  scratch2;
 278         u32  scratch3;
 279         u32  scratch4;
 280         u32  scratch5;
 281         u32  scratch6;
 282         u32  scratch7;
 283 } __attribute__ ((packed));
 284
 285 #define NUM_BD (int)(PAGE_SIZE / sizeof(struct sdma_buffer_descriptor))
 286
 287 struct sdma_engine;
 288
 289 /**
 290  * struct sdma_channel - housekeeping for a SDMA channel
 291  *
 292  * @sdma                pointer to the SDMA engine for this channel
 293  * @channel             the channel number, matches dmaengine chan_id + 1
 294  * @direction           transfer type. Needed for setting SDMA script
 295  * @peripheral_type     Peripheral type. Needed for setting SDMA script
 296  * @event_id0           aka dma request line
 297  * @event_id1           for channels that use 2 events
 298  * @word_size           peripheral access size
 299  * @buf_tail            ID of the buffer that was processed
 300  * @num_bd              max NUM_BD. number of descriptors currently handling
 301  */
 302 struct sdma_channel {
 303         struct sdma_engine              *sdma;
 304         unsigned int                    channel;
 305         enum dma_transfer_direction             direction;
 306         enum sdma_peripheral_type       peripheral_type;
 307         unsigned int                    event_id0;
 308         unsigned int                    event_id1;
 309         enum dma_slave_buswidth         word_size;
 310         unsigned int                    buf_tail;
 311         unsigned int                    num_bd;
 312         unsigned int                    period_len;
 313         struct sdma_buffer_descriptor   *bd;
 314         dma_addr_t                      bd_phys;
 315         unsigned int                    pc_from_device, pc_to_device;
 316         unsigned int                    device_to_device;
 317         unsigned long                   flags;
 318         dma_addr_t                      per_address, per_address2;
 319         unsigned long                   event_mask[2];
 320         unsigned long                   watermark_level;
 321         u32                             shp_addr, per_addr;
 322         struct dma_chan                 chan;
 323         spinlock_t                      lock;
 324         struct dma_async_tx_descriptor  desc;
 325         enum dma_status                 status;
 326         unsigned int                    chn_count;
 327         unsigned int                    chn_real_count;
 328         struct tasklet_struct           tasklet;
 329         struct imx_dma_data             data;
 330 };
 331
 332 #define IMX_DMA_SG_LOOP         BIT(0)
 333
 334 #define MAX_DMA_CHANNELS 32
 335 #define MXC_SDMA_DEFAULT_PRIORITY 1
 336 #define MXC_SDMA_MIN_PRIORITY 1
 337 #define MXC_SDMA_MAX_PRIORITY 7
 338
 339 #define SDMA_FIRMWARE_MAGIC 0x414d4453
 340
 341 /**
 342  * struct sdma_firmware_header - Layout of the firmware image
 343  *
 344  * @magic               "SDMA"
 345  * @version_major       increased whenever layout of struct sdma_script_start_addrs
 346  *                      changes.
 347  * @version_minor       firmware minor version (for binary compatible changes)
 348  * @script_addrs_start  offset of struct sdma_script_start_addrs in this image
 349  * @num_script_addrs    Number of script addresses in this image
 350  * @ram_code_start      offset of SDMA ram image in this firmware image
 351  * @ram_code_size       size of SDMA ram image
 352  * @script_addrs        Stores the start address of the SDMA scripts
 353  *                      (in SDMA memory space)
 354  */
 355 struct sdma_firmware_header {
 356         u32     magic;
 357         u32     version_major;
 358         u32     version_minor;
 359         u32     script_addrs_start;
 360         u32     num_script_addrs;
 361         u32     ram_code_start;
 362         u32     ram_code_size;
 363 };
 364
 365 struct sdma_driver_data {
 366         int chnenbl0;
 367         int num_events;
 368         struct sdma_script_start_addrs  *script_addrs;
 369 };
 370
 371 struct sdma_engine {
 372         struct device                   *dev;
 373         struct device_dma_parameters    dma_parms;
 374         struct sdma_channel             channel[MAX_DMA_CHANNELS];
 375         struct sdma_channel_control     *channel_control;
 376         void __iomem                    *regs;
 377         struct sdma_context_data        *context;
 378         dma_addr_t                      context_phys;
 379         struct dma_device               dma_device;
 380         struct clk                      *clk_ipg;
 381         struct clk                      *clk_ahb;
 382         spinlock_t                      channel_0_lock;
 383         u32                             script_number;
 384         struct sdma_script_start_addrs  *script_addrs;
 385         const struct sdma_driver_data   *drvdata;
 386         u32                             spba_start_addr;
 387         u32                             spba_end_addr;
 388 };
 389
 390 static struct sdma_driver_data sdma_imx31 = {
 391         .chnenbl0 = SDMA_CHNENBL0_IMX31,
 392         .num_events = 32,
 393 };
 394
 395 static struct sdma_script_start_addrs sdma_script_imx25 = {
 396         .ap_2_ap_addr = 729,
 397         .uart_2_mcu_addr = 904,
 398         .per_2_app_addr = 1255,
 399         .mcu_2_app_addr = 834,
 400         .uartsh_2_mcu_addr = 1120,
 401         .per_2_shp_addr = 1329,
 402         .mcu_2_shp_addr = 1048,
 403         .ata_2_mcu_addr = 1560,
 404         .mcu_2_ata_addr = 1479,
 405         .app_2_per_addr = 1189,
 406         .app_2_mcu_addr = 770,
 407         .shp_2_per_addr = 1407,
 408         .shp_2_mcu_addr = 979,
 409 };
 410
 411 static struct sdma_driver_data sdma_imx25 = {
 412         .chnenbl0 = SDMA_CHNENBL0_IMX35,
 413         .num_events = 48,
 414         .script_addrs = &sdma_script_imx25,
 415 };
 416
 417 static struct sdma_driver_data sdma_imx35 = {
 418         .chnenbl0 = SDMA_CHNENBL0_IMX35,
 419         .num_events = 48,
 420 };
 421
 422 static struct sdma_script_start_addrs sdma_script_imx51 = {
 423         .ap_2_ap_addr = 642,
 424         .uart_2_mcu_addr = 817,
 425         .mcu_2_app_addr = 747,
 426         .mcu_2_shp_addr = 961,
 427         .ata_2_mcu_addr = 1473,
 428         .mcu_2_ata_addr = 1392,
 429         .app_2_per_addr = 1033,
 430         .app_2_mcu_addr = 683,
 431         .shp_2_per_addr = 1251,
 432         .shp_2_mcu_addr = 892,
 433 };
 434
 435 static struct sdma_driver_data sdma_imx51 = {
 436         .chnenbl0 = SDMA_CHNENBL0_IMX35,
 437         .num_events = 48,
 438         .script_addrs = &sdma_script_imx51,
 439 };
 440
 441 static struct sdma_script_start_addrs sdma_script_imx53 = {
 442         .ap_2_ap_addr = 642,
 443         .app_2_mcu_addr = 683,
 444         .mcu_2_app_addr = 747,
 445         .uart_2_mcu_addr = 817,
 446         .shp_2_mcu_addr = 891,
 447         .mcu_2_shp_addr = 960,
 448         .uartsh_2_mcu_addr = 1032,
 449         .spdif_2_mcu_addr = 1100,
 450         .mcu_2_spdif_addr = 1134,
 451         .firi_2_mcu_addr = 1193,
 452         .mcu_2_firi_addr = 1290,
 453 };
 454
 455 static struct sdma_driver_data sdma_imx53 = {
 456         .chnenbl0 = SDMA_CHNENBL0_IMX35,
 457         .num_events = 48,
 458         .script_addrs = &sdma_script_imx53,
 459 };
 460
 461 static struct sdma_script_start_addrs sdma_script_imx6q = {
 462         .ap_2_ap_addr = 642,
 463         .uart_2_mcu_addr = 817,
 464         .mcu_2_app_addr = 747,
 465         .per_2_per_addr = 6331,
 466         .uartsh_2_mcu_addr = 1032,
 467         .mcu_2_shp_addr = 960,
 468         .app_2_mcu_addr = 683,
 469         .shp_2_mcu_addr = 891,
 470         .spdif_2_mcu_addr = 1100,
 471         .mcu_2_spdif_addr = 1134,
 472 };
 473
 474 static struct sdma_driver_data sdma_imx6q = {
 475         .chnenbl0 = SDMA_CHNENBL0_IMX35,
 476         .num_events = 48,
 477         .script_addrs = &sdma_script_imx6q,
 478 };
 479
 480 static const struct platform_device_id sdma_devtypes[] = {
 481         {
 482                 .name = "imx25-sdma",
 483                 .driver_data = (unsigned long)&sdma_imx25,
 484         }, {
 485                 .name = "imx31-sdma",
 486                 .driver_data = (unsigned long)&sdma_imx31,
 487         }, {
 488                 .name = "imx35-sdma",
 489                 .driver_data = (unsigned long)&sdma_imx35,
 490         }, {
 491                 .name = "imx51-sdma",
 492                 .driver_data = (unsigned long)&sdma_imx51,
 493         }, {
 494                 .name = "imx53-sdma",
 495                 .driver_data = (unsigned long)&sdma_imx53,
 496         }, {
 497                 .name = "imx6q-sdma",
 498                 .driver_data = (unsigned long)&sdma_imx6q,
 499         }, {
 500                 /* sentinel */
 501         }
 502 };
 503 MODULE_DEVICE_TABLE(platform, sdma_devtypes);
 504
 505 static const struct of_device_id sdma_dt_ids[] = {
 506         { .compatible = "fsl,imx6q-sdma", .data = &sdma_imx6q, },
 507         { .compatible = "fsl,imx53-sdma", .data = &sdma_imx53, },
 508         { .compatible = "fsl,imx51-sdma", .data = &sdma_imx51, },
 509         { .compatible = "fsl,imx35-sdma", .data = &sdma_imx35, },
 510         { .compatible = "fsl,imx31-sdma", .data = &sdma_imx31, },
 511         { .compatible = "fsl,imx25-sdma", .data = &sdma_imx25, },
 512         { /* sentinel */ }
 513 };
 514 MODULE_DEVICE_TABLE(of, sdma_dt_ids);
 515
 516 #define SDMA_H_CONFIG_DSPDMA    BIT(12) /* indicates if the DSPDMA is used */
 517 #define SDMA_H_CONFIG_RTD_PINS  BIT(11) /* indicates if Real-Time Debug pins are enabled */
 518 #define SDMA_H_CONFIG_ACR       BIT(4)  /* indicates if AHB freq /core freq = 2 or 1 */
 519 #define SDMA_H_CONFIG_CSM       (3)       /* indicates which context switch mode is selected*/
 520
 521 static inline u32 chnenbl_ofs(struct sdma_engine *sdma, unsigned int event)
 522 {
 523         u32 chnenbl0 = sdma->drvdata->chnenbl0;
 524         return chnenbl0 + event * 4;
 525 }
 526
 527 static int sdma_config_ownership(struct sdma_channel *sdmac,
 528                 bool event_override, bool mcu_override, bool dsp_override)
 529 {
 530         struct sdma_engine *sdma = sdmac->sdma;
 531         int channel = sdmac->channel;
 532         unsigned long evt, mcu, dsp;
 533
 534         if (event_override && mcu_override && dsp_override)
 535                 return -EINVAL;
 536
 537         evt = readl_relaxed(sdma->regs + SDMA_H_EVTOVR);
 538         mcu = readl_relaxed(sdma->regs + SDMA_H_HOSTOVR);
 539         dsp = readl_relaxed(sdma->regs + SDMA_H_DSPOVR);
 540
 541         if (dsp_override)
 542                 __clear_bit(channel, &dsp);
 543         else
 544                 __set_bit(channel, &dsp);
 545
 546         if (event_override)
 547                 __clear_bit(channel, &evt);
 548         else
 549                 __set_bit(channel, &evt);
 550
 551         if (mcu_override)
 552                 __clear_bit(channel, &mcu);
 553         else
 554                 __set_bit(channel, &mcu);
 555
 556         writel_relaxed(evt, sdma->regs + SDMA_H_EVTOVR);
 557         writel_relaxed(mcu, sdma->regs + SDMA_H_HOSTOVR);
 558         writel_relaxed(dsp, sdma->regs + SDMA_H_DSPOVR);
 559
 560         return 0;
 561 }
 562
 563 static void sdma_enable_channel(struct sdma_engine *sdma, int channel)
 564 {
 565         writel(BIT(channel), sdma->regs + SDMA_H_START);
 566 }
 567
 568 /*
 569  * sdma_run_channel0 - run a channel and wait till it's done
 570  */
 571 static int sdma_run_channel0(struct sdma_engine *sdma)
 572 {
 573         int ret;
 574         unsigned long timeout = 500;
 575
 576         sdma_enable_channel(sdma, 0);
 577
 578         while (!(ret = readl_relaxed(sdma->regs + SDMA_H_INTR) & 1)) {
 579                 if (timeout-- <= 0)
 580                         break;
 581                 udelay(1);
 582         }
 583
 584         if (ret) {
 585                 /* Clear the interrupt status */
 586                 writel_relaxed(ret, sdma->regs + SDMA_H_INTR);
 587         } else {
 588                 dev_err(sdma->dev, "Timeout waiting for CH0 ready\n");
 589         }
 590
 591         /* Set bits of CONFIG register with dynamic context switching */
 592         if (readl(sdma->regs + SDMA_H_CONFIG) == 0)
 593                 writel_relaxed(SDMA_H_CONFIG_CSM, sdma->regs + SDMA_H_CONFIG);
 594
 595         return ret ? 0 : -ETIMEDOUT;
 596 }
 597
 598 static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
 599                 u32 address)
 600 {
 601         struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd;
 602         void *buf_virt;
 603         dma_addr_t buf_phys;
 604         int ret;
 605         unsigned long flags;
 606
 607         buf_virt = dma_alloc_coherent(NULL,
 608                         size,
 609                         &buf_phys, GFP_KERNEL);
 610         if (!buf_virt) {
 611                 return -ENOMEM;
 612         }
 613
 614         spin_lock_irqsave(&sdma->channel_0_lock, flags);
 615
 616         bd0->mode.command = C0_SETPM;
 617         bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
 618         bd0->mode.count = size / 2;
 619         bd0->buffer_addr = buf_phys;
 620         bd0->ext_buffer_addr = address;
 621
 622         memcpy(buf_virt, buf, size);
 623
 624         ret = sdma_run_channel0(sdma);
 625
 626         spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
 627
 628         dma_free_coherent(NULL, size, buf_virt, buf_phys);
 629
 630         return ret;
 631 }
 632
 633 static void sdma_event_enable(struct sdma_channel *sdmac, unsigned int event)
 634 {
 635         struct sdma_engine *sdma = sdmac->sdma;
 636         int channel = sdmac->channel;
 637         unsigned long val;
 638         u32 chnenbl = chnenbl_ofs(sdma, event);
 639
 640         val = readl_relaxed(sdma->regs + chnenbl);
 641         __set_bit(channel, &val);
 642         writel_relaxed(val, sdma->regs + chnenbl);
 643 }
 644
 645 static void sdma_event_disable(struct sdma_channel *sdmac, unsigned int event)
 646 {
 647         struct sdma_engine *sdma = sdmac->sdma;
 648         int channel = sdmac->channel;
 649         u32 chnenbl = chnenbl_ofs(sdma, event);
 650         unsigned long val;
 651
 652         val = readl_relaxed(sdma->regs + chnenbl);
 653         __clear_bit(channel, &val);
 654         writel_relaxed(val, sdma->regs + chnenbl);
 655 }
 656
 657 static void sdma_handle_channel_loop(struct sdma_channel *sdmac)
 658 {
 659         if (sdmac->desc.callback)
 660                 sdmac->desc.callback(sdmac->desc.callback_param);
 661 }
 662
 663 static void sdma_update_channel_loop(struct sdma_channel *sdmac)
 664 {
 665         struct sdma_buffer_descriptor *bd;
 666
 667         /*
 668          * loop mode. Iterate over descriptors, re-setup them and
 669          * call callback function.
 670          */
 671         while (1) {
 672                 bd = &sdmac->bd[sdmac->buf_tail];
 673
 674                 if (bd->mode.status & BD_DONE)
 675                         break;
 676
 677                 if (bd->mode.status & BD_RROR)
 678                         sdmac->status = DMA_ERROR;
 679
 680                 bd->mode.status |= BD_DONE;
 681                 sdmac->buf_tail++;
 682                 sdmac->buf_tail %= sdmac->num_bd;
 683         }
 684 }
 685
 686 static void mxc_sdma_handle_channel_normal(struct sdma_channel *sdmac)
 687 {
 688         struct sdma_buffer_descriptor *bd;
 689         int i, error = 0;
 690
 691         sdmac->chn_real_count = 0;
 692         /*
 693          * non loop mode. Iterate over all descriptors, collect
 694          * errors and call callback function
 695          */
 696         for (i = 0; i < sdmac->num_bd; i++) {
 697                 bd = &sdmac->bd[i];
 698
 699                  if (bd->mode.status & (BD_DONE | BD_RROR))
 700                         error = -EIO;
 701                  sdmac->chn_real_count += bd->mode.count;
 702         }
 703
 704         if (error)
 705                 sdmac->status = DMA_ERROR;
 706         else
 707                 sdmac->status = DMA_COMPLETE;
 708
 709         dma_cookie_complete(&sdmac->desc);
 710         if (sdmac->desc.callback)
 711                 sdmac->desc.callback(sdmac->desc.callback_param);
 712 }
 713
 714 static void sdma_tasklet(unsigned long data)
 715 {
 716         struct sdma_channel *sdmac = (struct sdma_channel *) data;
 717
 718         if (sdmac->flags & IMX_DMA_SG_LOOP)
 719                 sdma_handle_channel_loop(sdmac);
 720         else
 721                 mxc_sdma_handle_channel_normal(sdmac);
 722 }
 723
 724 static irqreturn_t sdma_int_handler(int irq, void *dev_id)
 725 {
 726         struct sdma_engine *sdma = dev_id;
 727         unsigned long stat;
 728
 729         stat = readl_relaxed(sdma->regs + SDMA_H_INTR);
 730         /* not interested in channel 0 interrupts */
 731         stat &= ~1;
 732         writel_relaxed(stat, sdma->regs + SDMA_H_INTR);
 733
 734         while (stat) {
 735                 int channel = fls(stat) - 1;
 736                 struct sdma_channel *sdmac = &sdma->channel[channel];
 737
 738                 if (sdmac->flags & IMX_DMA_SG_LOOP)
 739                         sdma_update_channel_loop(sdmac);
 740
 741                 tasklet_schedule(&sdmac->tasklet);
 742
 743                 __clear_bit(channel, &stat);
 744         }
 745
 746         return IRQ_HANDLED;
 747 }
 748
 749 /*
 750  * sets the pc of SDMA script according to the peripheral type
 751  */
 752 static void sdma_get_pc(struct sdma_channel *sdmac,
 753                 enum sdma_peripheral_type peripheral_type)
 754 {
 755         struct sdma_engine *sdma = sdmac->sdma;
 756         int per_2_emi = 0, emi_2_per = 0;
 757         /*
 758          * These are needed once we start to support transfers between
 759          * two peripherals or memory-to-memory transfers
 760          */
 761         int per_2_per = 0, emi_2_emi = 0;
 762
 763         sdmac->pc_from_device = 0;
 764         sdmac->pc_to_device = 0;
 765         sdmac->device_to_device = 0;
 766
 767         switch (peripheral_type) {
 768         case IMX_DMATYPE_MEMORY:
 769                 emi_2_emi = sdma->script_addrs->ap_2_ap_addr;
 770                 break;
 771         case IMX_DMATYPE_DSP:
 772                 emi_2_per = sdma->script_addrs->bp_2_ap_addr;
 773                 per_2_emi = sdma->script_addrs->ap_2_bp_addr;
 774                 break;
 775         case IMX_DMATYPE_FIRI:
 776                 per_2_emi = sdma->script_addrs->firi_2_mcu_addr;
 777                 emi_2_per = sdma->script_addrs->mcu_2_firi_addr;
 778                 break;
 779         case IMX_DMATYPE_UART:
 780                 per_2_emi = sdma->script_addrs->uart_2_mcu_addr;
 781                 emi_2_per = sdma->script_addrs->mcu_2_app_addr;
 782                 break;
 783         case IMX_DMATYPE_UART_SP:
 784                 per_2_emi = sdma->script_addrs->uartsh_2_mcu_addr;
 785                 emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
 786                 break;
 787         case IMX_DMATYPE_ATA:
 788                 per_2_emi = sdma->script_addrs->ata_2_mcu_addr;
 789                 emi_2_per = sdma->script_addrs->mcu_2_ata_addr;
 790                 break;
 791         case IMX_DMATYPE_CSPI:
 792         case IMX_DMATYPE_EXT:
 793         case IMX_DMATYPE_SSI:
 794         case IMX_DMATYPE_SAI:
 795                 per_2_emi = sdma->script_addrs->app_2_mcu_addr;
 796                 emi_2_per = sdma->script_addrs->mcu_2_app_addr;
 797                 break;
 798         case IMX_DMATYPE_SSI_DUAL:
 799                 per_2_emi = sdma->script_addrs->ssish_2_mcu_addr;
 800                 emi_2_per = sdma->script_addrs->mcu_2_ssish_addr;
 801                 break;
 802         case IMX_DMATYPE_SSI_SP:
 803         case IMX_DMATYPE_MMC:
 804         case IMX_DMATYPE_SDHC:
 805         case IMX_DMATYPE_CSPI_SP:
 806         case IMX_DMATYPE_ESAI:
 807         case IMX_DMATYPE_MSHC_SP:
 808                 per_2_emi = sdma->script_addrs->shp_2_mcu_addr;
 809                 emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
 810                 break;
 811         case IMX_DMATYPE_ASRC:
 812                 per_2_emi = sdma->script_addrs->asrc_2_mcu_addr;
 813                 emi_2_per = sdma->script_addrs->asrc_2_mcu_addr;
 814                 per_2_per = sdma->script_addrs->per_2_per_addr;
 815                 break;
 816         case IMX_DMATYPE_ASRC_SP:
 817                 per_2_emi = sdma->script_addrs->shp_2_mcu_addr;
 818                 emi_2_per = sdma->script_addrs->mcu_2_shp_addr;
 819                 per_2_per = sdma->script_addrs->per_2_per_addr;
 820                 break;
 821         case IMX_DMATYPE_MSHC:
 822                 per_2_emi = sdma->script_addrs->mshc_2_mcu_addr;
 823                 emi_2_per = sdma->script_addrs->mcu_2_mshc_addr;
 824                 break;
 825         case IMX_DMATYPE_CCM:
 826                 per_2_emi = sdma->script_addrs->dptc_dvfs_addr;
 827                 break;
 828         case IMX_DMATYPE_SPDIF:
 829                 per_2_emi = sdma->script_addrs->spdif_2_mcu_addr;
 830                 emi_2_per = sdma->script_addrs->mcu_2_spdif_addr;
 831                 break;
 832         case IMX_DMATYPE_IPU_MEMORY:
 833                 emi_2_per = sdma->script_addrs->ext_mem_2_ipu_addr;
 834                 break;
 835         default:
 836                 break;
 837         }
 838
 839         sdmac->pc_from_device = per_2_emi;
 840         sdmac->pc_to_device = emi_2_per;
 841         sdmac->device_to_device = per_2_per;
 842 }
 843
 844 static int sdma_load_context(struct sdma_channel *sdmac)
 845 {
 846         struct sdma_engine *sdma = sdmac->sdma;
 847         int channel = sdmac->channel;
 848         int load_address;
 849         struct sdma_context_data *context = sdma->context;
 850         struct sdma_buffer_descriptor *bd0 = sdma->channel[0].bd;
 851         int ret;
 852         unsigned long flags;
 853
 854         if (sdmac->direction == DMA_DEV_TO_MEM)
 855                 load_address = sdmac->pc_from_device;
 856         else if (sdmac->direction == DMA_DEV_TO_DEV)
 857                 load_address = sdmac->device_to_device;
 858         else
 859                 load_address = sdmac->pc_to_device;
 860
 861         if (load_address < 0)
 862                 return load_address;
 863
 864         dev_dbg(sdma->dev, "load_address = %d\n", load_address);
 865         dev_dbg(sdma->dev, "wml = 0x%08x\n", (u32)sdmac->watermark_level);
 866         dev_dbg(sdma->dev, "shp_addr = 0x%08x\n", sdmac->shp_addr);
 867         dev_dbg(sdma->dev, "per_addr = 0x%08x\n", sdmac->per_addr);
 868         dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", (u32)sdmac->event_mask[0]);
 869         dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", (u32)sdmac->event_mask[1]);
 870
 871         spin_lock_irqsave(&sdma->channel_0_lock, flags);
 872
 873         memset(context, 0, sizeof(*context));
 874         context->channel_state.pc = load_address;
 875
 876         /* Send by context the event mask,base address for peripheral
 877          * and watermark level
 878          */
 879         context->gReg[0] = sdmac->event_mask[1];
 880         context->gReg[1] = sdmac->event_mask[0];
 881         context->gReg[2] = sdmac->per_addr;
 882         context->gReg[6] = sdmac->shp_addr;
 883         context->gReg[7] = sdmac->watermark_level;
 884
 885         bd0->mode.command = C0_SETDM;
 886         bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
 887         bd0->mode.count = sizeof(*context) / 4;
 888         bd0->buffer_addr = sdma->context_phys;
 889         bd0->ext_buffer_addr = 2048 + (sizeof(*context) / 4) * channel;
 890         ret = sdma_run_channel0(sdma);
 891
 892         spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
 893
 894         return ret;
 895 }
 896
 897 static struct sdma_channel *to_sdma_chan(struct dma_chan *chan)
 898 {
 899         return container_of(chan, struct sdma_channel, chan);
 900 }
 901
 902 static int sdma_disable_channel(struct dma_chan *chan)
 903 {
 904         struct sdma_channel *sdmac = to_sdma_chan(chan);
 905         struct sdma_engine *sdma = sdmac->sdma;
 906         int channel = sdmac->channel;
 907
 908         writel_relaxed(BIT(channel), sdma->regs + SDMA_H_STATSTOP);
 909         sdmac->status = DMA_ERROR;
 910
 911         return 0;
 912 }
 913
 914 static void sdma_set_watermarklevel_for_p2p(struct sdma_channel *sdmac)
 915 {
 916         struct sdma_engine *sdma = sdmac->sdma;
 917
 918         int lwml = sdmac->watermark_level & SDMA_WATERMARK_LEVEL_LWML;
 919         int hwml = (sdmac->watermark_level & SDMA_WATERMARK_LEVEL_HWML) >> 16;
 920
 921         set_bit(sdmac->event_id0 % 32, &sdmac->event_mask[1]);
 922         set_bit(sdmac->event_id1 % 32, &sdmac->event_mask[0]);
 923
 924         if (sdmac->event_id0 > 31)
 925                 sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_LWE;
 926
 927         if (sdmac->event_id1 > 31)
 928                 sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_HWE;
 929
 930         /*
 931          * If LWML(src_maxburst) > HWML(dst_maxburst), we need
 932          * swap LWML and HWML of INFO(A.3.2.5.1), also need swap
 933          * r0(event_mask[1]) and r1(event_mask[0]).
 934          */
 935         if (lwml > hwml) {
 936                 sdmac->watermark_level &= ~(SDMA_WATERMARK_LEVEL_LWML |
 937                                                 SDMA_WATERMARK_LEVEL_HWML);
 938                 sdmac->watermark_level |= hwml;
 939                 sdmac->watermark_level |= lwml << 16;
 940                 swap(sdmac->event_mask[0], sdmac->event_mask[1]);
 941         }
 942
 943         if (sdmac->per_address2 >= sdma->spba_start_addr &&
 944                         sdmac->per_address2 <= sdma->spba_end_addr)
 945                 sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_SP;
 946
 947         if (sdmac->per_address >= sdma->spba_start_addr &&
 948                         sdmac->per_address <= sdma->spba_end_addr)
 949                 sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_DP;
 950
 951         sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_CONT;
 952 }
 953
 954 static int sdma_config_channel(struct dma_chan *chan)
 955 {
 956         struct sdma_channel *sdmac = to_sdma_chan(chan);
 957         int ret;
 958
 959         sdma_disable_channel(chan);
 960
 961         sdmac->event_mask[0] = 0;
 962         sdmac->event_mask[1] = 0;
 963         sdmac->shp_addr = 0;
 964         sdmac->per_addr = 0;
 965
 966         if (sdmac->event_id0) {
 967                 if (sdmac->event_id0 >= sdmac->sdma->drvdata->num_events)
 968                         return -EINVAL;
 969                 sdma_event_enable(sdmac, sdmac->event_id0);
 970         }
 971
 972         if (sdmac->event_id1) {
 973                 if (sdmac->event_id1 >= sdmac->sdma->drvdata->num_events)
 974                         return -EINVAL;
 975                 sdma_event_enable(sdmac, sdmac->event_id1);
 976         }
 977
 978         switch (sdmac->peripheral_type) {
 979         case IMX_DMATYPE_DSP:
 980                 sdma_config_ownership(sdmac, false, true, true);
 981                 break;
 982         case IMX_DMATYPE_MEMORY:
 983                 sdma_config_ownership(sdmac, false, true, false);
 984                 break;
 985         default:
 986                 sdma_config_ownership(sdmac, true, true, false);
 987                 break;
 988         }
 989
 990         sdma_get_pc(sdmac, sdmac->peripheral_type);
 991
 992         if ((sdmac->peripheral_type != IMX_DMATYPE_MEMORY) &&
 993                         (sdmac->peripheral_type != IMX_DMATYPE_DSP)) {
 994                 /* Handle multiple event channels differently */
 995                 if (sdmac->event_id1) {
 996                         if (sdmac->peripheral_type == IMX_DMATYPE_ASRC_SP ||
 997                             sdmac->peripheral_type == IMX_DMATYPE_ASRC)
 998                                 sdma_set_watermarklevel_for_p2p(sdmac);
 999                 } else
1000                         __set_bit(sdmac->event_id0, sdmac->event_mask);
1001
1002                 /* Watermark Level */
1003                 sdmac->watermark_level |= sdmac->watermark_level;
1004                 /* Address */
1005                 sdmac->shp_addr = sdmac->per_address;
1006                 sdmac->per_addr = sdmac->per_address2;
1007         } else {
1008                 sdmac->watermark_level = 0; /* FIXME: M3_BASE_ADDRESS */
1009         }
1010
1011         ret = sdma_load_context(sdmac);
1012
1013         return ret;
1014 }
1015
1016 static int sdma_set_channel_priority(struct sdma_channel *sdmac,
1017                 unsigned int priority)
1018 {
1019         struct sdma_engine *sdma = sdmac->sdma;
1020         int channel = sdmac->channel;
1021
1022         if (priority < MXC_SDMA_MIN_PRIORITY
1023             || priority > MXC_SDMA_MAX_PRIORITY) {
1024                 return -EINVAL;
1025         }
1026
1027         writel_relaxed(priority, sdma->regs + SDMA_CHNPRI_0 + 4 * channel);
1028
1029         return 0;
1030 }
1031
1032 static int sdma_request_channel(struct sdma_channel *sdmac)
1033 {
1034         struct sdma_engine *sdma = sdmac->sdma;
1035         int channel = sdmac->channel;
1036         int ret = -EBUSY;
1037
1038         sdmac->bd = dma_zalloc_coherent(NULL, PAGE_SIZE, &sdmac->bd_phys,
1039                                         GFP_KERNEL);
1040         if (!sdmac->bd) {
1041                 ret = -ENOMEM;
1042                 goto out;
1043         }
1044
1045         sdma->channel_control[channel].base_bd_ptr = sdmac->bd_phys;
1046         sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
1047
1048         sdma_set_channel_priority(sdmac, MXC_SDMA_DEFAULT_PRIORITY);
1049         return 0;
1050 out:
1051
1052         return ret;
1053 }
1054
1055 static dma_cookie_t sdma_tx_submit(struct dma_async_tx_descriptor *tx)
1056 {
1057         unsigned long flags;
1058         struct sdma_channel *sdmac = to_sdma_chan(tx->chan);
1059         dma_cookie_t cookie;
1060
1061         spin_lock_irqsave(&sdmac->lock, flags);
1062
1063         cookie = dma_cookie_assign(tx);
1064
1065         spin_unlock_irqrestore(&sdmac->lock, flags);
1066
1067         return cookie;
1068 }
1069
1070 static int sdma_alloc_chan_resources(struct dma_chan *chan)
1071 {
1072         struct sdma_channel *sdmac = to_sdma_chan(chan);
1073         struct imx_dma_data *data = chan->private;
1074         int prio, ret;
1075
1076         if (!data)
1077                 return -EINVAL;
1078
1079         switch (data->priority) {
1080         case DMA_PRIO_HIGH:
1081                 prio = 3;
1082                 break;
1083         case DMA_PRIO_MEDIUM:
1084                 prio = 2;
1085                 break;
1086         case DMA_PRIO_LOW:
1087         default:
1088                 prio = 1;
1089                 break;
1090         }
1091
1092         sdmac->peripheral_type = data->peripheral_type;
1093         sdmac->event_id0 = data->dma_request;
1094         sdmac->event_id1 = data->dma_request2;
1095
1096         ret = clk_enable(sdmac->sdma->clk_ipg);
1097         if (ret)
1098                 return ret;
1099         ret = clk_enable(sdmac->sdma->clk_ahb);
1100         if (ret)
1101                 goto disable_clk_ipg;
1102
1103         ret = sdma_request_channel(sdmac);
1104         if (ret)
1105                 goto disable_clk_ahb;
1106
1107         ret = sdma_set_channel_priority(sdmac, prio);
1108         if (ret)
1109                 goto disable_clk_ahb;
1110
1111         dma_async_tx_descriptor_init(&sdmac->desc, chan);
1112         sdmac->desc.tx_submit = sdma_tx_submit;
1113         /* txd.flags will be overwritten in prep funcs */
1114         sdmac->desc.flags = DMA_CTRL_ACK;
1115
1116         return 0;
1117
1118 disable_clk_ahb:
1119         clk_disable(sdmac->sdma->clk_ahb);
1120 disable_clk_ipg:
1121         clk_disable(sdmac->sdma->clk_ipg);
1122         return ret;
1123 }
1124
1125 static void sdma_free_chan_resources(struct dma_chan *chan)
1126 {
1127         struct sdma_channel *sdmac = to_sdma_chan(chan);
1128         struct sdma_engine *sdma = sdmac->sdma;
1129
1130         sdma_disable_channel(chan);
1131
1132         if (sdmac->event_id0)
1133                 sdma_event_disable(sdmac, sdmac->event_id0);
1134         if (sdmac->event_id1)
1135                 sdma_event_disable(sdmac, sdmac->event_id1);
1136
1137         sdmac->event_id0 = 0;
1138         sdmac->event_id1 = 0;
1139
1140         sdma_set_channel_priority(sdmac, 0);
1141
1142         dma_free_coherent(NULL, PAGE_SIZE, sdmac->bd, sdmac->bd_phys);
1143
1144         clk_disable(sdma->clk_ipg);
1145         clk_disable(sdma->clk_ahb);
1146 }
1147
1148 static struct dma_async_tx_descriptor *sdma_prep_slave_sg(
1149                 struct dma_chan *chan, struct scatterlist *sgl,
1150                 unsigned int sg_len, enum dma_transfer_direction direction,
1151                 unsigned long flags, void *context)
1152 {
1153         struct sdma_channel *sdmac = to_sdma_chan(chan);
1154         struct sdma_engine *sdma = sdmac->sdma;
1155         int ret, i, count;
1156         int channel = sdmac->channel;
1157         struct scatterlist *sg;
1158
1159         if (sdmac->status == DMA_IN_PROGRESS)
1160                 return NULL;
1161         sdmac->status = DMA_IN_PROGRESS;
1162
1163         sdmac->flags = 0;
1164
1165         sdmac->buf_tail = 0;
1166
1167         dev_dbg(sdma->dev, "setting up %d entries for channel %d.\n",
1168                         sg_len, channel);
1169
1170         sdmac->direction = direction;
1171         ret = sdma_load_context(sdmac);
1172         if (ret)
1173                 goto err_out;
1174
1175         if (sg_len > NUM_BD) {
1176                 dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n",
1177                                 channel, sg_len, NUM_BD);
1178                 ret = -EINVAL;
1179                 goto err_out;
1180         }
1181
1182         sdmac->chn_count = 0;
1183         for_each_sg(sgl, sg, sg_len, i) {
1184                 struct sdma_buffer_descriptor *bd = &sdmac->bd[i];
1185                 int param;
1186
1187                 bd->buffer_addr = sg->dma_address;
1188
1189                 count = sg_dma_len(sg);
1190
1191                 if (count > 0xffff) {
1192                         dev_err(sdma->dev, "SDMA channel %d: maximum bytes for sg entry exceeded: %d > %d\n",
1193                                         channel, count, 0xffff);
1194                         ret = -EINVAL;
1195                         goto err_out;
1196                 }
1197
1198                 bd->mode.count = count;
1199                 sdmac->chn_count += count;
1200
1201                 if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES) {
1202                         ret =  -EINVAL;
1203                         goto err_out;
1204                 }
1205
1206                 switch (sdmac->word_size) {
1207                 case DMA_SLAVE_BUSWIDTH_4_BYTES:
1208                         bd->mode.command = 0;
1209                         if (count & 3 || sg->dma_address & 3)
1210                                 return NULL;
1211                         break;
1212                 case DMA_SLAVE_BUSWIDTH_2_BYTES:
1213                         bd->mode.command = 2;
1214                         if (count & 1 || sg->dma_address & 1)
1215                                 return NULL;
1216                         break;
1217                 case DMA_SLAVE_BUSWIDTH_1_BYTE:
1218                         bd->mode.command = 1;
1219                         break;
1220                 default:
1221                         return NULL;
1222                 }
1223
1224                 param = BD_DONE | BD_EXTD | BD_CONT;
1225
1226                 if (i + 1 == sg_len) {
1227                         param |= BD_INTR;
1228                         param |= BD_LAST;
1229                         param &= ~BD_CONT;
1230                 }
1231
1232                 dev_dbg(sdma->dev, "entry %d: count: %d dma: %#llx %s%s\n",
1233                                 i, count, (u64)sg->dma_address,
1234                                 param & BD_WRAP ? "wrap" : "",
1235                                 param & BD_INTR ? " intr" : "");
1236
1237                 bd->mode.status = param;
1238         }
1239
1240         sdmac->num_bd = sg_len;
1241         sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
1242
1243         return &sdmac->desc;
1244 err_out:
1245         sdmac->status = DMA_ERROR;
1246         return NULL;
1247 }
1248
1249 static struct dma_async_tx_descriptor *sdma_prep_dma_cyclic(
1250                 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
1251                 size_t period_len, enum dma_transfer_direction direction,
1252                 unsigned long flags)
1253 {
1254         struct sdma_channel *sdmac = to_sdma_chan(chan);
1255         struct sdma_engine *sdma = sdmac->sdma;
1256         int num_periods = buf_len / period_len;
1257         int channel = sdmac->channel;
1258         int ret, i = 0, buf = 0;
1259
1260         dev_dbg(sdma->dev, "%s channel: %d\n", __func__, channel);
1261
1262         if (sdmac->status == DMA_IN_PROGRESS)
1263                 return NULL;
1264
1265         sdmac->status = DMA_IN_PROGRESS;
1266
1267         sdmac->buf_tail = 0;
1268         sdmac->period_len = period_len;
1269
1270         sdmac->flags |= IMX_DMA_SG_LOOP;
1271         sdmac->direction = direction;
1272         ret = sdma_load_context(sdmac);
1273         if (ret)
1274                 goto err_out;
1275
1276         if (num_periods > NUM_BD) {
1277                 dev_err(sdma->dev, "SDMA channel %d: maximum number of sg exceeded: %d > %d\n",
1278                                 channel, num_periods, NUM_BD);
1279                 goto err_out;
1280         }
1281
1282         if (period_len > 0xffff) {
1283                 dev_err(sdma->dev, "SDMA channel %d: maximum period size exceeded: %d > %d\n",
1284                                 channel, period_len, 0xffff);
1285                 goto err_out;
1286         }
1287
1288         while (buf < buf_len) {
1289                 struct sdma_buffer_descriptor *bd = &sdmac->bd[i];
1290                 int param;
1291
1292                 bd->buffer_addr = dma_addr;
1293
1294                 bd->mode.count = period_len;
1295
1296                 if (sdmac->word_size > DMA_SLAVE_BUSWIDTH_4_BYTES)
1297                         goto err_out;
1298                 if (sdmac->word_size == DMA_SLAVE_BUSWIDTH_4_BYTES)
1299                         bd->mode.command = 0;
1300                 else
1301                         bd->mode.command = sdmac->word_size;
1302
1303                 param = BD_DONE | BD_EXTD | BD_CONT | BD_INTR;
1304                 if (i + 1 == num_periods)
1305                         param |= BD_WRAP;
1306
1307                 dev_dbg(sdma->dev, "entry %d: count: %d dma: %#llx %s%s\n",
1308                                 i, period_len, (u64)dma_addr,
1309                                 param & BD_WRAP ? "wrap" : "",
1310                                 param & BD_INTR ? " intr" : "");
1311
1312                 bd->mode.status = param;
1313
1314                 dma_addr += period_len;
1315                 buf += period_len;
1316
1317                 i++;
1318         }
1319
1320         sdmac->num_bd = num_periods;
1321         sdma->channel_control[channel].current_bd_ptr = sdmac->bd_phys;
1322
1323         return &sdmac->desc;
1324 err_out:
1325         sdmac->status = DMA_ERROR;
1326         return NULL;
1327 }
1328
1329 static int sdma_config(struct dma_chan *chan,
1330                        struct dma_slave_config *dmaengine_cfg)
1331 {
1332         struct sdma_channel *sdmac = to_sdma_chan(chan);
1333
1334         if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
1335                 sdmac->per_address = dmaengine_cfg->src_addr;
1336                 sdmac->watermark_level = dmaengine_cfg->src_maxburst *
1337                         dmaengine_cfg->src_addr_width;
1338                 sdmac->word_size = dmaengine_cfg->src_addr_width;
1339         } else if (dmaengine_cfg->direction == DMA_DEV_TO_DEV) {
1340                 sdmac->per_address2 = dmaengine_cfg->src_addr;
1341                 sdmac->per_address = dmaengine_cfg->dst_addr;
1342                 sdmac->watermark_level = dmaengine_cfg->src_maxburst &
1343                         SDMA_WATERMARK_LEVEL_LWML;
1344                 sdmac->watermark_level |= (dmaengine_cfg->dst_maxburst << 16) &
1345                         SDMA_WATERMARK_LEVEL_HWML;
1346                 sdmac->word_size = dmaengine_cfg->dst_addr_width;
1347         } else {
1348                 sdmac->per_address = dmaengine_cfg->dst_addr;
1349                 sdmac->watermark_level = dmaengine_cfg->dst_maxburst *
1350                         dmaengine_cfg->dst_addr_width;
1351                 sdmac->word_size = dmaengine_cfg->dst_addr_width;
1352         }
1353         sdmac->direction = dmaengine_cfg->direction;
1354         return sdma_config_channel(chan);
1355 }
1356
1357 static enum dma_status sdma_tx_status(struct dma_chan *chan,
1358                                       dma_cookie_t cookie,
1359                                       struct dma_tx_state *txstate)
1360 {
1361         struct sdma_channel *sdmac = to_sdma_chan(chan);
1362         u32 residue;
1363
1364         if (sdmac->flags & IMX_DMA_SG_LOOP)
1365                 residue = (sdmac->num_bd - sdmac->buf_tail) * sdmac->period_len;
1366         else
1367                 residue = sdmac->chn_count - sdmac->chn_real_count;
1368
1369         dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie,
1370                          residue);
1371
1372         return sdmac->status;
1373 }
1374
1375 static void sdma_issue_pending(struct dma_chan *chan)
1376 {
1377         struct sdma_channel *sdmac = to_sdma_chan(chan);
1378         struct sdma_engine *sdma = sdmac->sdma;
1379
1380         if (sdmac->status == DMA_IN_PROGRESS)
1381                 sdma_enable_channel(sdma, sdmac->channel);
1382 }
1383
1384 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34
1385 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2 38
1386 #define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3 41
1387
1388 static void sdma_add_scripts(struct sdma_engine *sdma,
1389                 const struct sdma_script_start_addrs *addr)
1390 {
1391         s32 *addr_arr = (u32 *)addr;
1392         s32 *saddr_arr = (u32 *)sdma->script_addrs;
1393         int i;
1394
1395         /* use the default firmware in ROM if missing external firmware */
1396         if (!sdma->script_number)
1397                 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1;
1398
1399         for (i = 0; i < sdma->script_number; i++)
1400                 if (addr_arr[i] > 0)
1401                         saddr_arr[i] = addr_arr[i];
1402 }
1403
1404 static void sdma_load_firmware(const struct firmware *fw, void *context)
1405 {
1406         struct sdma_engine *sdma = context;
1407         const struct sdma_firmware_header *header;
1408         const struct sdma_script_start_addrs *addr;
1409         unsigned short *ram_code;
1410
1411         if (!fw) {
1412                 dev_info(sdma->dev, "external firmware not found, using ROM firmware\n");
1413                 /* In this case we just use the ROM firmware. */
1414                 return;
1415         }
1416
1417         if (fw->size < sizeof(*header))
1418                 goto err_firmware;
1419
1420         header = (struct sdma_firmware_header *)fw->data;
1421
1422         if (header->magic != SDMA_FIRMWARE_MAGIC)
1423                 goto err_firmware;
1424         if (header->ram_code_start + header->ram_code_size > fw->size)
1425                 goto err_firmware;
1426         switch (header->version_major) {
1427         case 1:
1428                 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1;
1429                 break;
1430         case 2:
1431                 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2;
1432                 break;
1433         case 3:
1434                 sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V3;
1435                 break;
1436         default:
1437                 dev_err(sdma->dev, "unknown firmware version\n");
1438                 goto err_firmware;
1439         }
1440
1441         addr = (void *)header + header->script_addrs_start;
1442         ram_code = (void *)header + header->ram_code_start;
1443
1444         clk_enable(sdma->clk_ipg);
1445         clk_enable(sdma->clk_ahb);
1446         /* download the RAM image for SDMA */
1447         sdma_load_script(sdma, ram_code,
1448                         header->ram_code_size,
1449                         addr->ram_code_start_addr);
1450         clk_disable(sdma->clk_ipg);
1451         clk_disable(sdma->clk_ahb);
1452
1453         sdma_add_scripts(sdma, addr);
1454
1455         dev_info(sdma->dev, "loaded firmware %d.%d\n",
1456                         header->version_major,
1457                         header->version_minor);
1458
1459 err_firmware:
1460         release_firmware(fw);
1461 }
1462
1463 #define EVENT_REMAP_CELLS 3
1464
1465 static int sdma_event_remap(struct sdma_engine *sdma)
1466 {
1467         struct device_node *np = sdma->dev->of_node;
1468         struct device_node *gpr_np = of_parse_phandle(np, "gpr", 0);
1469         struct property *event_remap;
1470         struct regmap *gpr;
1471         char propname[] = "fsl,sdma-event-remap";
1472         u32 reg, val, shift, num_map, i;
1473         int ret = 0;
1474
1475         if (IS_ERR(np) || IS_ERR(gpr_np))
1476                 goto out;
1477
1478         event_remap = of_find_property(np, propname, NULL);
1479         num_map = event_remap ? (event_remap->length / sizeof(u32)) : 0;
1480         if (!num_map) {
1481                 dev_dbg(sdma->dev, "no event needs to be remapped\n");
1482                 goto out;
1483         } else if (num_map % EVENT_REMAP_CELLS) {
1484                 dev_err(sdma->dev, "the property %s must modulo %d\n",
1485                                 propname, EVENT_REMAP_CELLS);
1486                 ret = -EINVAL;
1487                 goto out;
1488         }
1489
1490         gpr = syscon_node_to_regmap(gpr_np);
1491         if (IS_ERR(gpr)) {
1492                 dev_err(sdma->dev, "failed to get gpr regmap\n");
1493                 ret = PTR_ERR(gpr);
1494                 goto out;
1495         }
1496
1497         for (i = 0; i < num_map; i += EVENT_REMAP_CELLS) {
1498                 ret = of_property_read_u32_index(np, propname, i, &reg);
1499                 if (ret) {
1500                         dev_err(sdma->dev, "failed to read property %s index %d\n",
1501                                         propname, i);
1502                         goto out;
1503                 }
1504
1505                 ret = of_property_read_u32_index(np, propname, i + 1, &shift);
1506                 if (ret) {
1507                         dev_err(sdma->dev, "failed to read property %s index %d\n",
1508                                         propname, i + 1);
1509                         goto out;
1510                 }
1511
1512                 ret = of_property_read_u32_index(np, propname, i + 2, &val);
1513                 if (ret) {
1514                         dev_err(sdma->dev, "failed to read property %s index %d\n",
1515                                         propname, i + 2);
1516                         goto out;
1517                 }
1518
1519                 regmap_update_bits(gpr, reg, BIT(shift), val << shift);
1520         }
1521
1522 out:
1523         if (!IS_ERR(gpr_np))
1524                 of_node_put(gpr_np);
1525
1526         return ret;
1527 }
1528
1529 static int sdma_get_firmware(struct sdma_engine *sdma,
1530                 const char *fw_name)
1531 {
1532         int ret;
1533
1534         ret = request_firmware_nowait(THIS_MODULE,
1535                         FW_ACTION_HOTPLUG, fw_name, sdma->dev,
1536                         GFP_KERNEL, sdma, sdma_load_firmware);
1537
1538         return ret;
1539 }
1540
1541 static int sdma_init(struct sdma_engine *sdma)
1542 {
1543         int i, ret;
1544         dma_addr_t ccb_phys;
1545
1546         ret = clk_enable(sdma->clk_ipg);
1547         if (ret)
1548                 return ret;
1549         ret = clk_enable(sdma->clk_ahb);
1550         if (ret)
1551                 goto disable_clk_ipg;
1552
1553         /* Be sure SDMA has not started yet */
1554         writel_relaxed(0, sdma->regs + SDMA_H_C0PTR);
1555
1556         sdma->channel_control = dma_alloc_coherent(NULL,
1557                         MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control) +
1558                         sizeof(struct sdma_context_data),
1559                         &ccb_phys, GFP_KERNEL);
1560
1561         if (!sdma->channel_control) {
1562                 ret = -ENOMEM;
1563                 goto err_dma_alloc;
1564         }
1565
1566         sdma->context = (void *)sdma->channel_control +
1567                 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control);
1568         sdma->context_phys = ccb_phys +
1569                 MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control);
1570
1571         /* Zero-out the CCB structures array just allocated */
1572         memset(sdma->channel_control, 0,
1573                         MAX_DMA_CHANNELS * sizeof (struct sdma_channel_control));
1574
1575         /* disable all channels */
1576         for (i = 0; i < sdma->drvdata->num_events; i++)
1577                 writel_relaxed(0, sdma->regs + chnenbl_ofs(sdma, i));
1578
1579         /* All channels have priority 0 */
1580         for (i = 0; i < MAX_DMA_CHANNELS; i++)
1581                 writel_relaxed(0, sdma->regs + SDMA_CHNPRI_0 + i * 4);
1582
1583         ret = sdma_request_channel(&sdma->channel[0]);
1584         if (ret)
1585                 goto err_dma_alloc;
1586
1587         sdma_config_ownership(&sdma->channel[0], false, true, false);
1588
1589         /* Set Command Channel (Channel Zero) */
1590         writel_relaxed(0x4050, sdma->regs + SDMA_CHN0ADDR);
1591
1592         /* Set bits of CONFIG register but with static context switching */
1593         /* FIXME: Check whether to set ACR bit depending on clock ratios */
1594         writel_relaxed(0, sdma->regs + SDMA_H_CONFIG);
1595
1596         writel_relaxed(ccb_phys, sdma->regs + SDMA_H_C0PTR);
1597
1598         /* Initializes channel's priorities */
1599         sdma_set_channel_priority(&sdma->channel[0], 7);
1600
1601         clk_disable(sdma->clk_ipg);
1602         clk_disable(sdma->clk_ahb);
1603
1604         return 0;
1605
1606 err_dma_alloc:
1607         clk_disable(sdma->clk_ahb);
1608 disable_clk_ipg:
1609         clk_disable(sdma->clk_ipg);
1610         dev_err(sdma->dev, "initialisation failed with %d\n", ret);
1611         return ret;
1612 }
1613
1614 static bool sdma_filter_fn(struct dma_chan *chan, void *fn_param)
1615 {
1616         struct sdma_channel *sdmac = to_sdma_chan(chan);
1617         struct imx_dma_data *data = fn_param;
1618
1619         if (!imx_dma_is_general_purpose(chan))
1620                 return false;
1621
1622         sdmac->data = *data;
1623         chan->private = &sdmac->data;
1624
1625         return true;
1626 }
1627
1628 static struct dma_chan *sdma_xlate(struct of_phandle_args *dma_spec,
1629                                    struct of_dma *ofdma)
1630 {
1631         struct sdma_engine *sdma = ofdma->of_dma_data;
1632         dma_cap_mask_t mask = sdma->dma_device.cap_mask;
1633         struct imx_dma_data data;
1634
1635         if (dma_spec->args_count != 3)
1636                 return NULL;
1637
1638         data.dma_request = dma_spec->args[0];
1639         data.peripheral_type = dma_spec->args[1];
1640         data.priority = dma_spec->args[2];
1641         /*
1642          * init dma_request2 to zero, which is not used by the dts.
1643          * For P2P, dma_request2 is init from dma_request_channel(),
1644          * chan->private will point to the imx_dma_data, and in
1645          * device_alloc_chan_resources(), imx_dma_data.dma_request2 will
1646          * be set to sdmac->event_id1.
1647          */
1648         data.dma_request2 = 0;
1649
1650         return dma_request_channel(mask, sdma_filter_fn, &data);
1651 }
1652
1653 static int sdma_probe(struct platform_device *pdev)
1654 {
1655         const struct of_device_id *of_id =
1656                         of_match_device(sdma_dt_ids, &pdev->dev);
1657         struct device_node *np = pdev->dev.of_node;
1658         struct device_node *spba_bus;
1659         const char *fw_name;
1660         int ret;
1661         int irq;
1662         struct resource *iores;
1663         struct resource spba_res;
1664         struct sdma_platform_data *pdata = dev_get_platdata(&pdev->dev);
1665         int i;
1666         struct sdma_engine *sdma;
1667         s32 *saddr_arr;
1668         const struct sdma_driver_data *drvdata = NULL;
1669
1670         if (of_id)
1671                 drvdata = of_id->data;
1672         else if (pdev->id_entry)
1673                 drvdata = (void *)pdev->id_entry->driver_data;
1674
1675         if (!drvdata) {
1676                 dev_err(&pdev->dev, "unable to find driver data\n");
1677                 return -EINVAL;
1678         }
1679
1680         ret = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
1681         if (ret)
1682                 return ret;
1683
1684         sdma = devm_kzalloc(&pdev->dev, sizeof(*sdma), GFP_KERNEL);
1685         if (!sdma)
1686                 return -ENOMEM;
1687
1688         spin_lock_init(&sdma->channel_0_lock);
1689
1690         sdma->dev = &pdev->dev;
1691         sdma->drvdata = drvdata;
1692
1693         irq = platform_get_irq(pdev, 0);
1694         if (irq < 0)
1695                 return irq;
1696
1697         iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1698         sdma->regs = devm_ioremap_resource(&pdev->dev, iores);
1699         if (IS_ERR(sdma->regs))
1700                 return PTR_ERR(sdma->regs);
1701
1702         sdma->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
1703         if (IS_ERR(sdma->clk_ipg))
1704                 return PTR_ERR(sdma->clk_ipg);
1705
1706         sdma->clk_ahb = devm_clk_get(&pdev->dev, "ahb");
1707         if (IS_ERR(sdma->clk_ahb))
1708                 return PTR_ERR(sdma->clk_ahb);
1709
1710         clk_prepare(sdma->clk_ipg);
1711         clk_prepare(sdma->clk_ahb);
1712
1713         ret = devm_request_irq(&pdev->dev, irq, sdma_int_handler, 0, "sdma",
1714                                sdma);
1715         if (ret)
1716                 return ret;
1717
1718         sdma->script_addrs = kzalloc(sizeof(*sdma->script_addrs), GFP_KERNEL);
1719         if (!sdma->script_addrs)
1720                 return -ENOMEM;
1721
1722         /* initially no scripts available */
1723         saddr_arr = (s32 *)sdma->script_addrs;
1724         for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++)
1725                 saddr_arr[i] = -EINVAL;
1726
1727         dma_cap_set(DMA_SLAVE, sdma->dma_device.cap_mask);
1728         dma_cap_set(DMA_CYCLIC, sdma->dma_device.cap_mask);
1729
1730         INIT_LIST_HEAD(&sdma->dma_device.channels);
1731         /* Initialize channel parameters */
1732         for (i = 0; i < MAX_DMA_CHANNELS; i++) {
1733                 struct sdma_channel *sdmac = &sdma->channel[i];
1734
1735                 sdmac->sdma = sdma;
1736                 spin_lock_init(&sdmac->lock);
1737
1738                 sdmac->chan.device = &sdma->dma_device;
1739                 dma_cookie_init(&sdmac->chan);
1740                 sdmac->channel = i;
1741
1742                 tasklet_init(&sdmac->tasklet, sdma_tasklet,
1743                              (unsigned long) sdmac);
1744                 /*
1745                  * Add the channel to the DMAC list. Do not add channel 0 though
1746                  * because we need it internally in the SDMA driver. This also means
1747                  * that channel 0 in dmaengine counting matches sdma channel 1.
1748                  */
1749                 if (i)
1750                         list_add_tail(&sdmac->chan.device_node,
1751                                         &sdma->dma_device.channels);
1752         }
1753
1754         ret = sdma_init(sdma);
1755         if (ret)
1756                 goto err_init;
1757
1758         ret = sdma_event_remap(sdma);
1759         if (ret)
1760                 goto err_init;
1761
1762         if (sdma->drvdata->script_addrs)
1763                 sdma_add_scripts(sdma, sdma->drvdata->script_addrs);
1764         if (pdata && pdata->script_addrs)
1765                 sdma_add_scripts(sdma, pdata->script_addrs);
1766
1767         if (pdata) {
1768                 ret = sdma_get_firmware(sdma, pdata->fw_name);
1769                 if (ret)
1770                         dev_warn(&pdev->dev, "failed to get firmware from platform data\n");
1771         } else {
1772                 /*
1773                  * Because that device tree does not encode ROM script address,
1774                  * the RAM script in firmware is mandatory for device tree
1775                  * probe, otherwise it fails.
1776                  */
1777                 ret = of_property_read_string(np, "fsl,sdma-ram-script-name",
1778                                               &fw_name);
1779                 if (ret)
1780                         dev_warn(&pdev->dev, "failed to get firmware name\n");
1781                 else {
1782                         ret = sdma_get_firmware(sdma, fw_name);
1783                         if (ret)
1784                                 dev_warn(&pdev->dev, "failed to get firmware from device tree\n");
1785                 }
1786         }
1787
1788         sdma->dma_device.dev = &pdev->dev;
1789
1790         sdma->dma_device.device_alloc_chan_resources = sdma_alloc_chan_resources;
1791         sdma->dma_device.device_free_chan_resources = sdma_free_chan_resources;
1792         sdma->dma_device.device_tx_status = sdma_tx_status;
1793         sdma->dma_device.device_prep_slave_sg = sdma_prep_slave_sg;
1794         sdma->dma_device.device_prep_dma_cyclic = sdma_prep_dma_cyclic;
1795         sdma->dma_device.device_config = sdma_config;
1796         sdma->dma_device.device_terminate_all = sdma_disable_channel;
1797         sdma->dma_device.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
1798         sdma->dma_device.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
1799         sdma->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
1800         sdma->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1801         sdma->dma_device.device_issue_pending = sdma_issue_pending;
1802         sdma->dma_device.dev->dma_parms = &sdma->dma_parms;
1803         dma_set_max_seg_size(sdma->dma_device.dev, 65535);
1804
1805         platform_set_drvdata(pdev, sdma);
1806
1807         ret = dma_async_device_register(&sdma->dma_device);
1808         if (ret) {
1809                 dev_err(&pdev->dev, "unable to register\n");
1810                 goto err_init;
1811         }
1812
1813         if (np) {
1814                 ret = of_dma_controller_register(np, sdma_xlate, sdma);
1815                 if (ret) {
1816                         dev_err(&pdev->dev, "failed to register controller\n");
1817                         goto err_register;
1818                 }
1819
1820                 spba_bus = of_find_compatible_node(NULL, NULL, "fsl,spba-bus");
1821                 ret = of_address_to_resource(spba_bus, 0, &spba_res);
1822                 if (!ret) {
1823                         sdma->spba_start_addr = spba_res.start;
1824                         sdma->spba_end_addr = spba_res.end;
1825                 }
1826                 of_node_put(spba_bus);
1827         }
1828
1829         return 0;
1830
1831 err_register:
1832         dma_async_device_unregister(&sdma->dma_device);
1833 err_init:
1834         kfree(sdma->script_addrs);
1835         return ret;
1836 }
1837
1838 static int sdma_remove(struct platform_device *pdev)
1839 {
1840         struct sdma_engine *sdma = platform_get_drvdata(pdev);
1841         int i;
1842
1843         dma_async_device_unregister(&sdma->dma_device);
1844         kfree(sdma->script_addrs);
1845         /* Kill the tasklet */
1846         for (i = 0; i < MAX_DMA_CHANNELS; i++) {
1847                 struct sdma_channel *sdmac = &sdma->channel[i];
1848
1849                 tasklet_kill(&sdmac->tasklet);
1850         }
1851
1852         platform_set_drvdata(pdev, NULL);
1853         return 0;
1854 }
1855
1856 static struct platform_driver sdma_driver = {
1857         .driver         = {
1858                 .name   = "imx-sdma",
1859                 .of_match_table = sdma_dt_ids,
1860         },
1861         .id_table       = sdma_devtypes,
1862         .remove         = sdma_remove,
1863         .probe          = sdma_probe,
1864 };
1865
1866 module_platform_driver(sdma_driver);
1867
1868 MODULE_AUTHOR("Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>");
1869 MODULE_DESCRIPTION("i.MX SDMA driver");
1870 MODULE_LICENSE("GPL");