drivers/net/davinci_emac.c

   1 /*
   2  * Ethernet driver for TI TMS320DM644x (DaVinci) chips.
   3  *
   4  * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
   5  *
   6  * Parts shamelessly stolen from TI's dm644x_emac.c. Original copyright
   7  * follows:
   8  *
   9  * ----------------------------------------------------------------------------
  10  *
  11  * dm644x_emac.c
  12  *
  13  * TI DaVinci (DM644X) EMAC peripheral driver source for DV-EVM
  14  *
  15  * Copyright (C) 2005 Texas Instruments.
  16  *
  17  * ----------------------------------------------------------------------------
  18  *
  19  * SPDX-License-Identifier:     GPL-2.0+
  20  *
  21  * Modifications:
  22  * ver. 1.0: Sep 2005, Anant Gole - Created EMAC version for uBoot.
  23  * ver  1.1: Nov 2005, Anant Gole - Extended the RX logic for multiple descriptors
  24  */
  25 #include <common.h>
  26 #include <command.h>
  27 #include <net.h>
  28 #include <miiphy.h>
  29 #include <malloc.h>
  30 #include <netdev.h>
  31 #include <linux/compiler.h>
  32 #include <asm/arch/emac_defs.h>
  33 #include <asm/io.h>
  34 #include "davinci_emac.h"
  35
  36 unsigned int    emac_dbg = 0;
  37 #define debug_emac(fmt,args...) if (emac_dbg) printf(fmt,##args)
  38
  39 #ifdef EMAC_HW_RAM_ADDR
  40 static inline unsigned long BD_TO_HW(unsigned long x)
  41 {
  42         if (x == 0)
  43                 return 0;
  44
  45         return x - EMAC_WRAPPER_RAM_ADDR + EMAC_HW_RAM_ADDR;
  46 }
  47
  48 static inline unsigned long HW_TO_BD(unsigned long x)
  49 {
  50         if (x == 0)
  51                 return 0;
  52
  53         return x - EMAC_HW_RAM_ADDR + EMAC_WRAPPER_RAM_ADDR;
  54 }
  55 #else
  56 #define BD_TO_HW(x)     (x)
  57 #define HW_TO_BD(x)     (x)
  58 #endif
  59
  60 #ifdef DAVINCI_EMAC_GIG_ENABLE
  61 #define emac_gigabit_enable(phy_addr)   davinci_eth_gigabit_enable(phy_addr)
  62 #else
  63 #define emac_gigabit_enable(phy_addr)   /* no gigabit to enable */
  64 #endif
  65
  66 #if !defined(CONFIG_SYS_EMAC_TI_CLKDIV)
  67 #define CONFIG_SYS_EMAC_TI_CLKDIV       ((EMAC_MDIO_BUS_FREQ / \
  68                 EMAC_MDIO_CLOCK_FREQ) - 1)
  69 #endif
  70
  71 static void davinci_eth_mdio_enable(void);
  72
  73 static int gen_init_phy(int phy_addr);
  74 static int gen_is_phy_connected(int phy_addr);
  75 static int gen_get_link_speed(int phy_addr);
  76 static int gen_auto_negotiate(int phy_addr);
  77
  78 void eth_mdio_enable(void)
  79 {
  80         davinci_eth_mdio_enable();
  81 }
  82
  83 /* EMAC Addresses */
  84 static volatile emac_regs       *adap_emac = (emac_regs *)EMAC_BASE_ADDR;
  85 static volatile ewrap_regs      *adap_ewrap = (ewrap_regs *)EMAC_WRAPPER_BASE_ADDR;
  86 static volatile mdio_regs       *adap_mdio = (mdio_regs *)EMAC_MDIO_BASE_ADDR;
  87
  88 /* EMAC descriptors */
  89 static volatile emac_desc       *emac_rx_desc = (emac_desc *)(EMAC_WRAPPER_RAM_ADDR + EMAC_RX_DESC_BASE);
  90 static volatile emac_desc       *emac_tx_desc = (emac_desc *)(EMAC_WRAPPER_RAM_ADDR + EMAC_TX_DESC_BASE);
  91 static volatile emac_desc       *emac_rx_active_head = 0;
  92 static volatile emac_desc       *emac_rx_active_tail = 0;
  93 static int                      emac_rx_queue_active = 0;
  94
  95 /* Receive packet buffers */
  96 static unsigned char emac_rx_buffers[EMAC_MAX_RX_BUFFERS * EMAC_RXBUF_SIZE]
  97                                 __aligned(ARCH_DMA_MINALIGN);
  98
  99 #ifndef CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
 100 #define CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT       3
 101 #endif
 102
 103 /* PHY address for a discovered PHY (0xff - not found) */
 104 static u_int8_t active_phy_addr[CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT];
 105
 106 /* number of PHY found active */
 107 static u_int8_t num_phy;
 108
 109 phy_t                           phy[CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT];
 110
 111 static int davinci_eth_set_mac_addr(struct eth_device *dev)
 112 {
 113         unsigned long           mac_hi;
 114         unsigned long           mac_lo;
 115
 116         /*
 117          * Set MAC Addresses & Init multicast Hash to 0 (disable any multicast
 118          * receive)
 119          *  Using channel 0 only - other channels are disabled
 120          *  */
 121         writel(0, &adap_emac->MACINDEX);
 122         mac_hi = (dev->enetaddr[3] << 24) |
 123                  (dev->enetaddr[2] << 16) |
 124                  (dev->enetaddr[1] << 8)  |
 125                  (dev->enetaddr[0]);
 126         mac_lo = (dev->enetaddr[5] << 8) |
 127                  (dev->enetaddr[4]);
 128
 129         writel(mac_hi, &adap_emac->MACADDRHI);
 130 #if defined(DAVINCI_EMAC_VERSION2)
 131         writel(mac_lo | EMAC_MAC_ADDR_IS_VALID | EMAC_MAC_ADDR_MATCH,
 132                &adap_emac->MACADDRLO);
 133 #else
 134         writel(mac_lo, &adap_emac->MACADDRLO);
 135 #endif
 136
 137         writel(0, &adap_emac->MACHASH1);
 138         writel(0, &adap_emac->MACHASH2);
 139
 140         /* Set source MAC address - REQUIRED */
 141         writel(mac_hi, &adap_emac->MACSRCADDRHI);
 142         writel(mac_lo, &adap_emac->MACSRCADDRLO);
 143
 144
 145         return 0;
 146 }
 147
 148 static void davinci_eth_mdio_enable(void)
 149 {
 150         u_int32_t       clkdiv;
 151
 152         clkdiv = CONFIG_SYS_EMAC_TI_CLKDIV;
 153
 154         writel((clkdiv & 0xff) |
 155                MDIO_CONTROL_ENABLE |
 156                MDIO_CONTROL_FAULT |
 157                MDIO_CONTROL_FAULT_ENABLE,
 158                &adap_mdio->CONTROL);
 159
 160         while (readl(&adap_mdio->CONTROL) & MDIO_CONTROL_IDLE)
 161                 ;
 162 }
 163
 164 /*
 165  * Tries to find an active connected PHY. Returns 1 if address if found.
 166  * If no active PHY (or more than one PHY) found returns 0.
 167  * Sets active_phy_addr variable.
 168  */
 169 static int davinci_eth_phy_detect(void)
 170 {
 171         u_int32_t       phy_act_state;
 172         int             i;
 173         int             j;
 174         unsigned int    count = 0;
 175
 176         for (i = 0; i < CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT; i++)
 177                 active_phy_addr[i] = 0xff;
 178
 179         udelay(1000);
 180         phy_act_state = readl(&adap_mdio->ALIVE);
 181
 182         if (phy_act_state == 0)
 183                 return 0;               /* No active PHYs */
 184
 185         debug_emac("davinci_eth_phy_detect(), ALIVE = 0x%08x\n", phy_act_state);
 186
 187         for (i = 0, j = 0; i < 32; i++)
 188                 if (phy_act_state & (1 << i)) {
 189                         count++;
 190                         if (count <= CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT) {
 191                                 active_phy_addr[j++] = i;
 192                         } else {
 193                                 printf("%s: to many PHYs detected.\n",
 194                                         __func__);
 195                                 count = 0;
 196                                 break;
 197                         }
 198                 }
 199
 200         num_phy = count;
 201
 202         return count;
 203 }
 204
 205
 206 /* Read a PHY register via MDIO inteface. Returns 1 on success, 0 otherwise */
 207 int davinci_eth_phy_read(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t *data)
 208 {
 209         int     tmp;
 210
 211         while (readl(&adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO)
 212                 ;
 213
 214         writel(MDIO_USERACCESS0_GO |
 215                MDIO_USERACCESS0_WRITE_READ |
 216                ((reg_num & 0x1f) << 21) |
 217                ((phy_addr & 0x1f) << 16),
 218                &adap_mdio->USERACCESS0);
 219
 220         /* Wait for command to complete */
 221         while ((tmp = readl(&adap_mdio->USERACCESS0)) & MDIO_USERACCESS0_GO)
 222                 ;
 223
 224         if (tmp & MDIO_USERACCESS0_ACK) {
 225                 *data = tmp & 0xffff;
 226                 return 1;
 227         }
 228
 229         return 0;
 230 }
 231
 232 /* Write to a PHY register via MDIO inteface. Blocks until operation is complete. */
 233 int davinci_eth_phy_write(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t data)
 234 {
 235
 236         while (readl(&adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO)
 237                 ;
 238
 239         writel(MDIO_USERACCESS0_GO |
 240                MDIO_USERACCESS0_WRITE_WRITE |
 241                ((reg_num & 0x1f) << 21) |
 242                ((phy_addr & 0x1f) << 16) |
 243                (data & 0xffff),
 244                &adap_mdio->USERACCESS0);
 245
 246         /* Wait for command to complete */
 247         while (readl(&adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO)
 248                 ;
 249
 250         return 1;
 251 }
 252
 253 /* PHY functions for a generic PHY */
 254 static int gen_init_phy(int phy_addr)
 255 {
 256         int     ret = 1;
 257
 258         if (gen_get_link_speed(phy_addr)) {
 259                 /* Try another time */
 260                 ret = gen_get_link_speed(phy_addr);
 261         }
 262
 263         return(ret);
 264 }
 265
 266 static int gen_is_phy_connected(int phy_addr)
 267 {
 268         u_int16_t       dummy;
 269
 270         return davinci_eth_phy_read(phy_addr, MII_PHYSID1, &dummy);
 271 }
 272
 273 static int get_active_phy(void)
 274 {
 275         int i;
 276
 277         for (i = 0; i < num_phy; i++)
 278                 if (phy[i].get_link_speed(active_phy_addr[i]))
 279                         return i;
 280
 281         return -1;      /* Return error if no link */
 282 }
 283
 284 static int gen_get_link_speed(int phy_addr)
 285 {
 286         u_int16_t       tmp;
 287
 288         if (davinci_eth_phy_read(phy_addr, MII_STATUS_REG, &tmp) &&
 289                         (tmp & 0x04)) {
 290 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 291                 defined(CONFIG_MACH_DAVINCI_DA850_EVM)
 292                 davinci_eth_phy_read(phy_addr, MII_LPA, &tmp);
 293
 294                 /* Speed doesn't matter, there is no setting for it in EMAC. */
 295                 if (tmp & (LPA_100FULL | LPA_10FULL)) {
 296                         /* set EMAC for Full Duplex  */
 297                         writel(EMAC_MACCONTROL_MIIEN_ENABLE |
 298                                         EMAC_MACCONTROL_FULLDUPLEX_ENABLE,
 299                                         &adap_emac->MACCONTROL);
 300                 } else {
 301                         /*set EMAC for Half Duplex  */
 302                         writel(EMAC_MACCONTROL_MIIEN_ENABLE,
 303                                         &adap_emac->MACCONTROL);
 304                 }
 305
 306                 if (tmp & (LPA_100FULL | LPA_100HALF))
 307                         writel(readl(&adap_emac->MACCONTROL) |
 308                                         EMAC_MACCONTROL_RMIISPEED_100,
 309                                          &adap_emac->MACCONTROL);
 310                 else
 311                         writel(readl(&adap_emac->MACCONTROL) &
 312                                         ~EMAC_MACCONTROL_RMIISPEED_100,
 313                                          &adap_emac->MACCONTROL);
 314 #endif
 315                 return(1);
 316         }
 317
 318         return(0);
 319 }
 320
 321 static int gen_auto_negotiate(int phy_addr)
 322 {
 323         u_int16_t       tmp;
 324         u_int16_t       val;
 325         unsigned long   cntr = 0;
 326
 327         if (!davinci_eth_phy_read(phy_addr, MII_BMCR, &tmp))
 328                 return 0;
 329
 330         val = tmp | BMCR_FULLDPLX | BMCR_ANENABLE |
 331                                                 BMCR_SPEED100;
 332         davinci_eth_phy_write(phy_addr, MII_BMCR, val);
 333
 334         if (!davinci_eth_phy_read(phy_addr, MII_ADVERTISE, &val))
 335                 return 0;
 336
 337         val |= (ADVERTISE_100FULL | ADVERTISE_100HALF | ADVERTISE_10FULL |
 338                                                         ADVERTISE_10HALF);
 339         davinci_eth_phy_write(phy_addr, MII_ADVERTISE, val);
 340
 341         if (!davinci_eth_phy_read(phy_addr, MII_BMCR, &tmp))
 342                 return(0);
 343
 344         /* Restart Auto_negotiation  */
 345         tmp |= BMCR_ANRESTART;
 346         davinci_eth_phy_write(phy_addr, MII_BMCR, tmp);
 347
 348         /*check AutoNegotiate complete */
 349         do {
 350                 udelay(40000);
 351                 if (!davinci_eth_phy_read(phy_addr, MII_BMSR, &tmp))
 352                         return 0;
 353
 354                 if (tmp & BMSR_ANEGCOMPLETE)
 355                         break;
 356
 357                 cntr++;
 358         } while (cntr < 200);
 359
 360         if (!davinci_eth_phy_read(phy_addr, MII_BMSR, &tmp))
 361                 return(0);
 362
 363         if (!(tmp & BMSR_ANEGCOMPLETE))
 364                 return(0);
 365
 366         return(gen_get_link_speed(phy_addr));
 367 }
 368 /* End of generic PHY functions */
 369
 370
 371 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 372 static int davinci_mii_phy_read(struct mii_dev *bus, int addr, int devad,
 373                                 int reg)
 374 {
 375         unsigned short value = 0;
 376         int retval = davinci_eth_phy_read(addr, reg, &value);
 377
 378         return retval ? value : -EIO;
 379 }
 380
 381 static int davinci_mii_phy_write(struct mii_dev *bus, int addr, int devad,
 382                                  int reg, u16 value)
 383 {
 384         return davinci_eth_phy_write(addr, reg, value) ? 0 : 1;
 385 }
 386 #endif
 387
 388 static void  __attribute__((unused)) davinci_eth_gigabit_enable(int phy_addr)
 389 {
 390         u_int16_t data;
 391
 392         if (davinci_eth_phy_read(phy_addr, 0, &data)) {
 393                 if (data & (1 << 6)) { /* speed selection MSB */
 394                         /*
 395                          * Check if link detected is giga-bit
 396                          * If Gigabit mode detected, enable gigbit in MAC
 397                          */
 398                         writel(readl(&adap_emac->MACCONTROL) |
 399                                 EMAC_MACCONTROL_GIGFORCE |
 400                                 EMAC_MACCONTROL_GIGABIT_ENABLE,
 401                                 &adap_emac->MACCONTROL);
 402                 }
 403         }
 404 }
 405
 406 /* Eth device open */
 407 static int davinci_eth_open(struct eth_device *dev, bd_t *bis)
 408 {
 409         dv_reg_p                addr;
 410         u_int32_t               clkdiv, cnt;
 411         volatile emac_desc      *rx_desc;
 412         int                     index;
 413
 414         debug_emac("+ emac_open\n");
 415
 416         /* Reset EMAC module and disable interrupts in wrapper */
 417         writel(1, &adap_emac->SOFTRESET);
 418         while (readl(&adap_emac->SOFTRESET) != 0)
 419                 ;
 420 #if defined(DAVINCI_EMAC_VERSION2)
 421         writel(1, &adap_ewrap->softrst);
 422         while (readl(&adap_ewrap->softrst) != 0)
 423                 ;
 424 #else
 425         writel(0, &adap_ewrap->EWCTL);
 426         for (cnt = 0; cnt < 5; cnt++) {
 427                 clkdiv = readl(&adap_ewrap->EWCTL);
 428         }
 429 #endif
 430
 431 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 432         defined(CONFIG_MACH_DAVINCI_DA850_EVM)
 433         adap_ewrap->c0rxen = adap_ewrap->c1rxen = adap_ewrap->c2rxen = 0;
 434         adap_ewrap->c0txen = adap_ewrap->c1txen = adap_ewrap->c2txen = 0;
 435         adap_ewrap->c0miscen = adap_ewrap->c1miscen = adap_ewrap->c2miscen = 0;
 436 #endif
 437         rx_desc = emac_rx_desc;
 438
 439         writel(1, &adap_emac->TXCONTROL);
 440         writel(1, &adap_emac->RXCONTROL);
 441
 442         davinci_eth_set_mac_addr(dev);
 443
 444         /* Set DMA 8 TX / 8 RX Head pointers to 0 */
 445         addr = &adap_emac->TX0HDP;
 446         for (cnt = 0; cnt < 8; cnt++)
 447                 writel(0, addr++);
 448
 449         addr = &adap_emac->RX0HDP;
 450         for (cnt = 0; cnt < 8; cnt++)
 451                 writel(0, addr++);
 452
 453         /* Clear Statistics (do this before setting MacControl register) */
 454         addr = &adap_emac->RXGOODFRAMES;
 455         for(cnt = 0; cnt < EMAC_NUM_STATS; cnt++)
 456                 writel(0, addr++);
 457
 458         /* No multicast addressing */
 459         writel(0, &adap_emac->MACHASH1);
 460         writel(0, &adap_emac->MACHASH2);
 461
 462         /* Create RX queue and set receive process in place */
 463         emac_rx_active_head = emac_rx_desc;
 464         for (cnt = 0; cnt < EMAC_MAX_RX_BUFFERS; cnt++) {
 465                 rx_desc->next = BD_TO_HW((u_int32_t)(rx_desc + 1));
 466                 rx_desc->buffer = &emac_rx_buffers[cnt * EMAC_RXBUF_SIZE];
 467                 rx_desc->buff_off_len = EMAC_MAX_ETHERNET_PKT_SIZE;
 468                 rx_desc->pkt_flag_len = EMAC_CPPI_OWNERSHIP_BIT;
 469                 rx_desc++;
 470         }
 471
 472         /* Finalize the rx desc list */
 473         rx_desc--;
 474         rx_desc->next = 0;
 475         emac_rx_active_tail = rx_desc;
 476         emac_rx_queue_active = 1;
 477
 478         /* Enable TX/RX */
 479         writel(EMAC_MAX_ETHERNET_PKT_SIZE, &adap_emac->RXMAXLEN);
 480         writel(0, &adap_emac->RXBUFFEROFFSET);
 481
 482         /*
 483          * No fancy configs - Use this for promiscous debug
 484          *   - EMAC_RXMBPENABLE_RXCAFEN_ENABLE
 485          */
 486         writel(EMAC_RXMBPENABLE_RXBROADEN, &adap_emac->RXMBPENABLE);
 487
 488         /* Enable ch 0 only */
 489         writel(1, &adap_emac->RXUNICASTSET);
 490
 491         /* Enable MII interface and Full duplex mode */
 492 #if defined(CONFIG_SOC_DA8XX) || \
 493         (defined(CONFIG_OMAP34XX) && defined(CONFIG_DRIVER_TI_EMAC_USE_RMII))
 494         writel((EMAC_MACCONTROL_MIIEN_ENABLE |
 495                 EMAC_MACCONTROL_FULLDUPLEX_ENABLE |
 496                 EMAC_MACCONTROL_RMIISPEED_100),
 497                &adap_emac->MACCONTROL);
 498 #else
 499         writel((EMAC_MACCONTROL_MIIEN_ENABLE |
 500                 EMAC_MACCONTROL_FULLDUPLEX_ENABLE),
 501                &adap_emac->MACCONTROL);
 502 #endif
 503
 504         /* Init MDIO & get link state */
 505         clkdiv = CONFIG_SYS_EMAC_TI_CLKDIV;
 506         writel((clkdiv & 0xff) | MDIO_CONTROL_ENABLE | MDIO_CONTROL_FAULT,
 507                &adap_mdio->CONTROL);
 508
 509         /* We need to wait for MDIO to start */
 510         udelay(1000);
 511
 512         index = get_active_phy();
 513         if (index == -1)
 514                 return(0);
 515
 516         emac_gigabit_enable(active_phy_addr[index]);
 517
 518         /* Start receive process */
 519         writel(BD_TO_HW((u_int32_t)emac_rx_desc), &adap_emac->RX0HDP);
 520
 521         debug_emac("- emac_open\n");
 522
 523         return(1);
 524 }
 525
 526 /* EMAC Channel Teardown */
 527 static void davinci_eth_ch_teardown(int ch)
 528 {
 529         dv_reg          dly = 0xff;
 530         dv_reg          cnt;
 531
 532         debug_emac("+ emac_ch_teardown\n");
 533
 534         if (ch == EMAC_CH_TX) {
 535                 /* Init TX channel teardown */
 536                 writel(0, &adap_emac->TXTEARDOWN);
 537                 do {
 538                         /*
 539                          * Wait here for Tx teardown completion interrupt to
 540                          * occur. Note: A task delay can be called here to pend
 541                          * rather than occupying CPU cycles - anyway it has
 542                          * been found that teardown takes very few cpu cycles
 543                          * and does not affect functionality
 544                          */
 545                         dly--;
 546                         udelay(1);
 547                         if (dly == 0)
 548                                 break;
 549                         cnt = readl(&adap_emac->TX0CP);
 550                 } while (cnt != 0xfffffffc);
 551                 writel(cnt, &adap_emac->TX0CP);
 552                 writel(0, &adap_emac->TX0HDP);
 553         } else {
 554                 /* Init RX channel teardown */
 555                 writel(0, &adap_emac->RXTEARDOWN);
 556                 do {
 557                         /*
 558                          * Wait here for Rx teardown completion interrupt to
 559                          * occur. Note: A task delay can be called here to pend
 560                          * rather than occupying CPU cycles - anyway it has
 561                          * been found that teardown takes very few cpu cycles
 562                          * and does not affect functionality
 563                          */
 564                         dly--;
 565                         udelay(1);
 566                         if (dly == 0)
 567                                 break;
 568                         cnt = readl(&adap_emac->RX0CP);
 569                 } while (cnt != 0xfffffffc);
 570                 writel(cnt, &adap_emac->RX0CP);
 571                 writel(0, &adap_emac->RX0HDP);
 572         }
 573
 574         debug_emac("- emac_ch_teardown\n");
 575 }
 576
 577 /* Eth device close */
 578 static void davinci_eth_close(struct eth_device *dev)
 579 {
 580         debug_emac("+ emac_close\n");
 581
 582         davinci_eth_ch_teardown(EMAC_CH_TX);    /* TX Channel teardown */
 583         if (readl(&adap_emac->RXCONTROL) & 1)
 584                 davinci_eth_ch_teardown(EMAC_CH_RX); /* RX Channel teardown */
 585
 586         /* Reset EMAC module and disable interrupts in wrapper */
 587         writel(1, &adap_emac->SOFTRESET);
 588 #if defined(DAVINCI_EMAC_VERSION2)
 589         writel(1, &adap_ewrap->softrst);
 590 #else
 591         writel(0, &adap_ewrap->EWCTL);
 592 #endif
 593
 594 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 595         defined(CONFIG_MACH_DAVINCI_DA850_EVM)
 596         adap_ewrap->c0rxen = adap_ewrap->c1rxen = adap_ewrap->c2rxen = 0;
 597         adap_ewrap->c0txen = adap_ewrap->c1txen = adap_ewrap->c2txen = 0;
 598         adap_ewrap->c0miscen = adap_ewrap->c1miscen = adap_ewrap->c2miscen = 0;
 599 #endif
 600         debug_emac("- emac_close\n");
 601 }
 602
 603 static int tx_send_loop = 0;
 604
 605 /*
 606  * This function sends a single packet on the network and returns
 607  * positive number (number of bytes transmitted) or negative for error
 608  */
 609 static int davinci_eth_send_packet (struct eth_device *dev,
 610                                         void *packet, int length)
 611 {
 612         int ret_status = -1;
 613         int index;
 614         tx_send_loop = 0;
 615
 616         index = get_active_phy();
 617         if (index == -1) {
 618                 printf(" WARN: emac_send_packet: No link\n");
 619                 return (ret_status);
 620         }
 621
 622         emac_gigabit_enable(active_phy_addr[index]);
 623
 624         /* Check packet size and if < EMAC_MIN_ETHERNET_PKT_SIZE, pad it up */
 625         if (length < EMAC_MIN_ETHERNET_PKT_SIZE) {
 626                 length = EMAC_MIN_ETHERNET_PKT_SIZE;
 627         }
 628
 629         /* Populate the TX descriptor */
 630         emac_tx_desc->next = 0;
 631         emac_tx_desc->buffer = (u_int8_t *) packet;
 632         emac_tx_desc->buff_off_len = (length & 0xffff);
 633         emac_tx_desc->pkt_flag_len = ((length & 0xffff) |
 634                                       EMAC_CPPI_SOP_BIT |
 635                                       EMAC_CPPI_OWNERSHIP_BIT |
 636                                       EMAC_CPPI_EOP_BIT);
 637
 638         flush_dcache_range((unsigned long)packet,
 639                            (unsigned long)packet + ALIGN(length, PKTALIGN));
 640
 641         /* Send the packet */
 642         writel(BD_TO_HW((unsigned long)emac_tx_desc), &adap_emac->TX0HDP);
 643
 644         /* Wait for packet to complete or link down */
 645         while (1) {
 646                 if (!phy[index].get_link_speed(active_phy_addr[index])) {
 647                         davinci_eth_ch_teardown (EMAC_CH_TX);
 648                         return (ret_status);
 649                 }
 650
 651                 emac_gigabit_enable(active_phy_addr[index]);
 652
 653                 if (readl(&adap_emac->TXINTSTATRAW) & 0x01) {
 654                         ret_status = length;
 655                         break;
 656                 }
 657                 tx_send_loop++;
 658         }
 659
 660         return (ret_status);
 661 }
 662
 663 /*
 664  * This function handles receipt of a packet from the network
 665  */
 666 static int davinci_eth_rcv_packet (struct eth_device *dev)
 667 {
 668         volatile emac_desc *rx_curr_desc;
 669         volatile emac_desc *curr_desc;
 670         volatile emac_desc *tail_desc;
 671         int status, ret = -1;
 672
 673         rx_curr_desc = emac_rx_active_head;
 674         if (!rx_curr_desc)
 675                 return 0;
 676         status = rx_curr_desc->pkt_flag_len;
 677         if ((status & EMAC_CPPI_OWNERSHIP_BIT) == 0) {
 678                 if (status & EMAC_CPPI_RX_ERROR_FRAME) {
 679                         /* Error in packet - discard it and requeue desc */
 680                         printf ("WARN: emac_rcv_pkt: Error in packet\n");
 681                 } else {
 682                         unsigned long tmp = (unsigned long)rx_curr_desc->buffer;
 683                         unsigned short len =
 684                                 rx_curr_desc->buff_off_len & 0xffff;
 685
 686                         invalidate_dcache_range(tmp, tmp + ALIGN(len, PKTALIGN));
 687                         net_process_received_packet(rx_curr_desc->buffer, len);
 688                         ret = len;
 689                 }
 690
 691                 /* Ack received packet descriptor */
 692                 writel(BD_TO_HW((ulong)rx_curr_desc), &adap_emac->RX0CP);
 693                 curr_desc = rx_curr_desc;
 694                 emac_rx_active_head =
 695                         (volatile emac_desc *) (HW_TO_BD(rx_curr_desc->next));
 696
 697                 if (status & EMAC_CPPI_EOQ_BIT) {
 698                         if (emac_rx_active_head) {
 699                                 writel(BD_TO_HW((ulong)emac_rx_active_head),
 700                                        &adap_emac->RX0HDP);
 701                         } else {
 702                                 emac_rx_queue_active = 0;
 703                                 printf ("INFO:emac_rcv_packet: RX Queue not active\n");
 704                         }
 705                 }
 706
 707                 /* Recycle RX descriptor */
 708                 rx_curr_desc->buff_off_len = EMAC_MAX_ETHERNET_PKT_SIZE;
 709                 rx_curr_desc->pkt_flag_len = EMAC_CPPI_OWNERSHIP_BIT;
 710                 rx_curr_desc->next = 0;
 711
 712                 if (emac_rx_active_head == 0) {
 713                         printf ("INFO: emac_rcv_pkt: active queue head = 0\n");
 714                         emac_rx_active_head = curr_desc;
 715                         emac_rx_active_tail = curr_desc;
 716                         if (emac_rx_queue_active != 0) {
 717                                 writel(BD_TO_HW((ulong)emac_rx_active_head),
 718                                        &adap_emac->RX0HDP);
 719                                 printf ("INFO: emac_rcv_pkt: active queue head = 0, HDP fired\n");
 720                                 emac_rx_queue_active = 1;
 721                         }
 722                 } else {
 723                         tail_desc = emac_rx_active_tail;
 724                         emac_rx_active_tail = curr_desc;
 725                         tail_desc->next = BD_TO_HW((ulong) curr_desc);
 726                         status = tail_desc->pkt_flag_len;
 727                         if (status & EMAC_CPPI_EOQ_BIT) {
 728                                 writel(BD_TO_HW((ulong)curr_desc),
 729                                        &adap_emac->RX0HDP);
 730                                 status &= ~EMAC_CPPI_EOQ_BIT;
 731                                 tail_desc->pkt_flag_len = status;
 732                         }
 733                 }
 734                 return (ret);
 735         }
 736         return (0);
 737 }
 738
 739 /*
 740  * This function initializes the emac hardware. It does NOT initialize
 741  * EMAC modules power or pin multiplexors, that is done by board_init()
 742  * much earlier in bootup process. Returns 1 on success, 0 otherwise.
 743  */
 744 int davinci_emac_initialize(void)
 745 {
 746         u_int32_t       phy_id;
 747         u_int16_t       tmp;
 748         int             i;
 749         int             ret;
 750         struct eth_device *dev;
 751
 752         dev = malloc(sizeof *dev);
 753
 754         if (dev == NULL)
 755                 return -1;
 756
 757         memset(dev, 0, sizeof *dev);
 758         strcpy(dev->name, "DaVinci-EMAC");
 759
 760         dev->iobase = 0;
 761         dev->init = davinci_eth_open;
 762         dev->halt = davinci_eth_close;
 763         dev->send = davinci_eth_send_packet;
 764         dev->recv = davinci_eth_rcv_packet;
 765         dev->write_hwaddr = davinci_eth_set_mac_addr;
 766
 767         eth_register(dev);
 768
 769         davinci_eth_mdio_enable();
 770
 771         /* let the EMAC detect the PHYs */
 772         udelay(5000);
 773
 774         for (i = 0; i < 256; i++) {
 775                 if (readl(&adap_mdio->ALIVE))
 776                         break;
 777                 udelay(1000);
 778         }
 779
 780         if (i >= 256) {
 781                 printf("No ETH PHY detected!!!\n");
 782                 return(0);
 783         }
 784
 785         /* Find if PHY(s) is/are connected */
 786         ret = davinci_eth_phy_detect();
 787         if (!ret)
 788                 return(0);
 789         else
 790                 debug_emac(" %d ETH PHY detected\n", ret);
 791
 792         /* Get PHY ID and initialize phy_ops for a detected PHY */
 793         for (i = 0; i < num_phy; i++) {
 794                 if (!davinci_eth_phy_read(active_phy_addr[i], MII_PHYSID1,
 795                                                         &tmp)) {
 796                         active_phy_addr[i] = 0xff;
 797                         continue;
 798                 }
 799
 800                 phy_id = (tmp << 16) & 0xffff0000;
 801
 802                 if (!davinci_eth_phy_read(active_phy_addr[i], MII_PHYSID2,
 803                                                         &tmp)) {
 804                         active_phy_addr[i] = 0xff;
 805                         continue;
 806                 }
 807
 808                 phy_id |= tmp & 0x0000ffff;
 809
 810                 switch (phy_id) {
 811 #ifdef PHY_KSZ8873
 812                 case PHY_KSZ8873:
 813                         sprintf(phy[i].name, "KSZ8873 @ 0x%02x",
 814                                                 active_phy_addr[i]);
 815                         phy[i].init = ksz8873_init_phy;
 816                         phy[i].is_phy_connected = ksz8873_is_phy_connected;
 817                         phy[i].get_link_speed = ksz8873_get_link_speed;
 818                         phy[i].auto_negotiate = ksz8873_auto_negotiate;
 819                         break;
 820 #endif
 821 #ifdef PHY_LXT972
 822                 case PHY_LXT972:
 823                         sprintf(phy[i].name, "LXT972 @ 0x%02x",
 824                                                 active_phy_addr[i]);
 825                         phy[i].init = lxt972_init_phy;
 826                         phy[i].is_phy_connected = lxt972_is_phy_connected;
 827                         phy[i].get_link_speed = lxt972_get_link_speed;
 828                         phy[i].auto_negotiate = lxt972_auto_negotiate;
 829                         break;
 830 #endif
 831 #ifdef PHY_DP83848
 832                 case PHY_DP83848:
 833                         sprintf(phy[i].name, "DP83848 @ 0x%02x",
 834                                                 active_phy_addr[i]);
 835                         phy[i].init = dp83848_init_phy;
 836                         phy[i].is_phy_connected = dp83848_is_phy_connected;
 837                         phy[i].get_link_speed = dp83848_get_link_speed;
 838                         phy[i].auto_negotiate = dp83848_auto_negotiate;
 839                         break;
 840 #endif
 841 #ifdef PHY_ET1011C
 842                 case PHY_ET1011C:
 843                         sprintf(phy[i].name, "ET1011C @ 0x%02x",
 844                                                 active_phy_addr[i]);
 845                         phy[i].init = gen_init_phy;
 846                         phy[i].is_phy_connected = gen_is_phy_connected;
 847                         phy[i].get_link_speed = et1011c_get_link_speed;
 848                         phy[i].auto_negotiate = gen_auto_negotiate;
 849                         break;
 850 #endif
 851                 default:
 852                         sprintf(phy[i].name, "GENERIC @ 0x%02x",
 853                                                 active_phy_addr[i]);
 854                         phy[i].init = gen_init_phy;
 855                         phy[i].is_phy_connected = gen_is_phy_connected;
 856                         phy[i].get_link_speed = gen_get_link_speed;
 857                         phy[i].auto_negotiate = gen_auto_negotiate;
 858                 }
 859
 860                 debug("Ethernet PHY: %s\n", phy[i].name);
 861
 862                 int retval;
 863                 struct mii_dev *mdiodev = mdio_alloc();
 864                 if (!mdiodev)
 865                         return -ENOMEM;
 866                 strncpy(mdiodev->name, phy[i].name, MDIO_NAME_LEN);
 867                 mdiodev->read = davinci_mii_phy_read;
 868                 mdiodev->write = davinci_mii_phy_write;
 869
 870                 retval = mdio_register(mdiodev);
 871                 if (retval < 0)
 872                         return retval;
 873         }
 874
 875 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 876                 defined(CONFIG_MACH_DAVINCI_DA850_EVM) && \
 877                         !defined(CONFIG_DRIVER_TI_EMAC_RMII_NO_NEGOTIATE)
 878         for (i = 0; i < num_phy; i++) {
 879                 if (phy[i].is_phy_connected(i))
 880                         phy[i].auto_negotiate(i);
 881         }
 882 #endif
 883         return(1);
 884 }