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  * This program is free software; you can redistribute it and/or modify
  20  * it under the terms of the GNU General Public License as published by
  21  * the Free Software Foundation; either version 2 of the License, or
  22  * (at your option) any later version.
  23  *
  24  * This program is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  * GNU General Public License for more details.
  28  *
  29  *  You should have received a copy of the GNU General Public License
  30  *  along with this program; if not, write to the Free Software
  31  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  32  * ----------------------------------------------------------------------------
  33
  34  * Modifications:
  35  * ver. 1.0: Sep 2005, Anant Gole - Created EMAC version for uBoot.
  36  * ver  1.1: Nov 2005, Anant Gole - Extended the RX logic for multiple descriptors
  37  *
  38  */
  39 #include <common.h>
  40 #include <command.h>
  41 #include <net.h>
  42 #include <miiphy.h>
  43 #include <malloc.h>
  44 #include <asm/arch/emac_defs.h>
  45 #include <asm/io.h>
  46
  47 unsigned int    emac_dbg = 0;
  48 #define debug_emac(fmt,args...) if (emac_dbg) printf(fmt,##args)
  49
  50 #ifdef DAVINCI_EMAC_GIG_ENABLE
  51 #define emac_gigabit_enable()   davinci_eth_gigabit_enable()
  52 #else
  53 #define emac_gigabit_enable()   /* no gigabit to enable */
  54 #endif
  55
  56 static void davinci_eth_mdio_enable(void);
  57
  58 static int gen_init_phy(int phy_addr);
  59 static int gen_is_phy_connected(int phy_addr);
  60 static int gen_get_link_speed(int phy_addr);
  61 static int gen_auto_negotiate(int phy_addr);
  62
  63 void eth_mdio_enable(void)
  64 {
  65         davinci_eth_mdio_enable();
  66 }
  67
  68 /* EMAC Addresses */
  69 static volatile emac_regs       *adap_emac = (emac_regs *)EMAC_BASE_ADDR;
  70 static volatile ewrap_regs      *adap_ewrap = (ewrap_regs *)EMAC_WRAPPER_BASE_ADDR;
  71 static volatile mdio_regs       *adap_mdio = (mdio_regs *)EMAC_MDIO_BASE_ADDR;
  72
  73 /* EMAC descriptors */
  74 static volatile emac_desc       *emac_rx_desc = (emac_desc *)(EMAC_WRAPPER_RAM_ADDR + EMAC_RX_DESC_BASE);
  75 static volatile emac_desc       *emac_tx_desc = (emac_desc *)(EMAC_WRAPPER_RAM_ADDR + EMAC_TX_DESC_BASE);
  76 static volatile emac_desc       *emac_rx_active_head = 0;
  77 static volatile emac_desc       *emac_rx_active_tail = 0;
  78 static int                      emac_rx_queue_active = 0;
  79
  80 /* Receive packet buffers */
  81 static unsigned char            emac_rx_buffers[EMAC_MAX_RX_BUFFERS * (EMAC_MAX_ETHERNET_PKT_SIZE + EMAC_PKT_ALIGN)];
  82
  83 #define MAX_PHY         3
  84
  85 /* PHY address for a discovered PHY (0xff - not found) */
  86 static u_int8_t active_phy_addr[MAX_PHY] = { 0xff, 0xff, 0xff };
  87
  88 /* number of PHY found active */
  89 static u_int8_t num_phy;
  90
  91 phy_t                           phy[MAX_PHY];
  92
  93 static int davinci_eth_set_mac_addr(struct eth_device *dev)
  94 {
  95         unsigned long           mac_hi;
  96         unsigned long           mac_lo;
  97
  98         /*
  99          * Set MAC Addresses & Init multicast Hash to 0 (disable any multicast
 100          * receive)
 101          *  Using channel 0 only - other channels are disabled
 102          *  */
 103         writel(0, &adap_emac->MACINDEX);
 104         mac_hi = (dev->enetaddr[3] << 24) |
 105                  (dev->enetaddr[2] << 16) |
 106                  (dev->enetaddr[1] << 8)  |
 107                  (dev->enetaddr[0]);
 108         mac_lo = (dev->enetaddr[5] << 8) |
 109                  (dev->enetaddr[4]);
 110
 111         writel(mac_hi, &adap_emac->MACADDRHI);
 112 #if defined(DAVINCI_EMAC_VERSION2)
 113         writel(mac_lo | EMAC_MAC_ADDR_IS_VALID | EMAC_MAC_ADDR_MATCH,
 114                &adap_emac->MACADDRLO);
 115 #else
 116         writel(mac_lo, &adap_emac->MACADDRLO);
 117 #endif
 118
 119         writel(0, &adap_emac->MACHASH1);
 120         writel(0, &adap_emac->MACHASH2);
 121
 122         /* Set source MAC address - REQUIRED */
 123         writel(mac_hi, &adap_emac->MACSRCADDRHI);
 124         writel(mac_lo, &adap_emac->MACSRCADDRLO);
 125
 126
 127         return 0;
 128 }
 129
 130 static void davinci_eth_mdio_enable(void)
 131 {
 132         u_int32_t       clkdiv;
 133
 134         clkdiv = (EMAC_MDIO_BUS_FREQ / EMAC_MDIO_CLOCK_FREQ) - 1;
 135
 136         writel((clkdiv & 0xff) |
 137                MDIO_CONTROL_ENABLE |
 138                MDIO_CONTROL_FAULT |
 139                MDIO_CONTROL_FAULT_ENABLE,
 140                &adap_mdio->CONTROL);
 141
 142         while (readl(&adap_mdio->CONTROL) & MDIO_CONTROL_IDLE)
 143                 ;
 144 }
 145
 146 /*
 147  * Tries to find an active connected PHY. Returns 1 if address if found.
 148  * If no active PHY (or more than one PHY) found returns 0.
 149  * Sets active_phy_addr variable.
 150  */
 151 static int davinci_eth_phy_detect(void)
 152 {
 153         u_int32_t       phy_act_state;
 154         int             i;
 155         int             j;
 156         unsigned int    count = 0;
 157
 158         active_phy_addr[0] = 0xff;
 159         active_phy_addr[1] = 0xff;
 160         active_phy_addr[2] = 0xff;
 161
 162         udelay(1000);
 163         phy_act_state = readl(&adap_mdio->ALIVE);
 164
 165         if (phy_act_state == 0)
 166                 return 0;               /* No active PHYs */
 167
 168         debug_emac("davinci_eth_phy_detect(), ALIVE = 0x%08x\n", phy_act_state);
 169
 170         for (i = 0, j = 0; i < 32; i++)
 171                 if (phy_act_state & (1 << i)) {
 172                         count++;
 173                         active_phy_addr[j++] = i;
 174                 }
 175
 176         num_phy = count;
 177
 178         return count;
 179 }
 180
 181
 182 /* Read a PHY register via MDIO inteface. Returns 1 on success, 0 otherwise */
 183 int davinci_eth_phy_read(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t *data)
 184 {
 185         int     tmp;
 186
 187         while (readl(&adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO)
 188                 ;
 189
 190         writel(MDIO_USERACCESS0_GO |
 191                MDIO_USERACCESS0_WRITE_READ |
 192                ((reg_num & 0x1f) << 21) |
 193                ((phy_addr & 0x1f) << 16),
 194                &adap_mdio->USERACCESS0);
 195
 196         /* Wait for command to complete */
 197         while ((tmp = readl(&adap_mdio->USERACCESS0)) & MDIO_USERACCESS0_GO)
 198                 ;
 199
 200         if (tmp & MDIO_USERACCESS0_ACK) {
 201                 *data = tmp & 0xffff;
 202                 return(1);
 203         }
 204
 205         *data = -1;
 206         return(0);
 207 }
 208
 209 /* Write to a PHY register via MDIO inteface. Blocks until operation is complete. */
 210 int davinci_eth_phy_write(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t data)
 211 {
 212
 213         while (readl(&adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO)
 214                 ;
 215
 216         writel(MDIO_USERACCESS0_GO |
 217                MDIO_USERACCESS0_WRITE_WRITE |
 218                ((reg_num & 0x1f) << 21) |
 219                ((phy_addr & 0x1f) << 16) |
 220                (data & 0xffff),
 221                &adap_mdio->USERACCESS0);
 222
 223         /* Wait for command to complete */
 224         while (readl(&adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO)
 225                 ;
 226
 227         return(1);
 228 }
 229
 230 /* PHY functions for a generic PHY */
 231 static int gen_init_phy(int phy_addr)
 232 {
 233         int     ret = 1;
 234
 235         if (gen_get_link_speed(phy_addr)) {
 236                 /* Try another time */
 237                 ret = gen_get_link_speed(phy_addr);
 238         }
 239
 240         return(ret);
 241 }
 242
 243 static int gen_is_phy_connected(int phy_addr)
 244 {
 245         u_int16_t       dummy;
 246
 247         return davinci_eth_phy_read(phy_addr, MII_PHYSID1, &dummy);
 248 }
 249
 250 static int get_active_phy(void)
 251 {
 252         int i;
 253
 254         for (i = 0; i < num_phy; i++)
 255                 if (phy[i].get_link_speed(active_phy_addr[i]))
 256                         return i;
 257
 258         return -1;      /* Return error if no link */
 259 }
 260
 261 static int gen_get_link_speed(int phy_addr)
 262 {
 263         u_int16_t       tmp;
 264
 265         if (davinci_eth_phy_read(phy_addr, MII_STATUS_REG, &tmp) &&
 266                         (tmp & 0x04)) {
 267 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 268                 defined(CONFIG_MACH_DAVINCI_DA850_EVM)
 269                 davinci_eth_phy_read(phy_addr, MII_LPA, &tmp);
 270
 271                 /* Speed doesn't matter, there is no setting for it in EMAC. */
 272                 if (tmp & (LPA_100FULL | LPA_10FULL)) {
 273                         /* set EMAC for Full Duplex  */
 274                         writel(EMAC_MACCONTROL_MIIEN_ENABLE |
 275                                         EMAC_MACCONTROL_FULLDUPLEX_ENABLE,
 276                                         &adap_emac->MACCONTROL);
 277                 } else {
 278                         /*set EMAC for Half Duplex  */
 279                         writel(EMAC_MACCONTROL_MIIEN_ENABLE,
 280                                         &adap_emac->MACCONTROL);
 281                 }
 282
 283                 if (tmp & (LPA_100FULL | LPA_100HALF))
 284                         writel(readl(&adap_emac->MACCONTROL) |
 285                                         EMAC_MACCONTROL_RMIISPEED_100,
 286                                          &adap_emac->MACCONTROL);
 287                 else
 288                         writel(readl(&adap_emac->MACCONTROL) &
 289                                         ~EMAC_MACCONTROL_RMIISPEED_100,
 290                                          &adap_emac->MACCONTROL);
 291 #endif
 292                 return(1);
 293         }
 294
 295         return(0);
 296 }
 297
 298 static int gen_auto_negotiate(int phy_addr)
 299 {
 300         u_int16_t       tmp;
 301         u_int16_t       val;
 302         unsigned long   cntr = 0;
 303
 304         if (!davinci_eth_phy_read(phy_addr, MII_BMCR, &tmp))
 305                 return 0;
 306
 307         val = tmp | BMCR_FULLDPLX | BMCR_ANENABLE |
 308                                                 BMCR_SPEED100;
 309         davinci_eth_phy_write(phy_addr, MII_BMCR, val);
 310
 311         if (!davinci_eth_phy_read(phy_addr, MII_ADVERTISE, &val))
 312                 return 0;
 313
 314         val |= (ADVERTISE_100FULL | ADVERTISE_100HALF | ADVERTISE_10FULL |
 315                                                         ADVERTISE_10HALF);
 316         davinci_eth_phy_write(phy_addr, MII_ADVERTISE, val);
 317
 318         if (!davinci_eth_phy_read(phy_addr, MII_BMCR, &tmp))
 319                 return(0);
 320
 321         /* Restart Auto_negotiation  */
 322         tmp |= BMCR_ANRESTART;
 323         davinci_eth_phy_write(phy_addr, MII_BMCR, tmp);
 324
 325         /*check AutoNegotiate complete */
 326         do {
 327                 udelay(40000);
 328                 if (!davinci_eth_phy_read(phy_addr, MII_BMSR, &tmp))
 329                         return 0;
 330
 331                 if (tmp & BMSR_ANEGCOMPLETE)
 332                         break;
 333
 334                 cntr++;
 335         } while (cntr < 200);
 336
 337         if (!davinci_eth_phy_read(phy_addr, MII_BMSR, &tmp))
 338                 return(0);
 339
 340         if (!(tmp & BMSR_ANEGCOMPLETE))
 341                 return(0);
 342
 343         return(gen_get_link_speed(phy_addr));
 344 }
 345 /* End of generic PHY functions */
 346
 347
 348 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 349 static int davinci_mii_phy_read(const char *devname, unsigned char addr, unsigned char reg, unsigned short *value)
 350 {
 351         return(davinci_eth_phy_read(addr, reg, value) ? 0 : 1);
 352 }
 353
 354 static int davinci_mii_phy_write(const char *devname, unsigned char addr, unsigned char reg, unsigned short value)
 355 {
 356         return(davinci_eth_phy_write(addr, reg, value) ? 0 : 1);
 357 }
 358 #endif
 359
 360 static void  __attribute__((unused)) davinci_eth_gigabit_enable(void)
 361 {
 362         u_int16_t data;
 363
 364         if (davinci_eth_phy_read(EMAC_MDIO_PHY_NUM, 0, &data)) {
 365                 if (data & (1 << 6)) { /* speed selection MSB */
 366                         /*
 367                          * Check if link detected is giga-bit
 368                          * If Gigabit mode detected, enable gigbit in MAC
 369                          */
 370                         writel(readl(&adap_emac->MACCONTROL) |
 371                                 EMAC_MACCONTROL_GIGFORCE |
 372                                 EMAC_MACCONTROL_GIGABIT_ENABLE,
 373                                 &adap_emac->MACCONTROL);
 374                 }
 375         }
 376 }
 377
 378 /* Eth device open */
 379 static int davinci_eth_open(struct eth_device *dev, bd_t *bis)
 380 {
 381         dv_reg_p                addr;
 382         u_int32_t               clkdiv, cnt;
 383         volatile emac_desc      *rx_desc;
 384         int                     index;
 385
 386         debug_emac("+ emac_open\n");
 387
 388         /* Reset EMAC module and disable interrupts in wrapper */
 389         writel(1, &adap_emac->SOFTRESET);
 390         while (readl(&adap_emac->SOFTRESET) != 0)
 391                 ;
 392 #if defined(DAVINCI_EMAC_VERSION2)
 393         writel(1, &adap_ewrap->softrst);
 394         while (readl(&adap_ewrap->softrst) != 0)
 395                 ;
 396 #else
 397         writel(0, &adap_ewrap->EWCTL);
 398         for (cnt = 0; cnt < 5; cnt++) {
 399                 clkdiv = readl(&adap_ewrap->EWCTL);
 400         }
 401 #endif
 402
 403 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 404         defined(CONFIG_MACH_DAVINCI_DA850_EVM)
 405         adap_ewrap->c0rxen = adap_ewrap->c1rxen = adap_ewrap->c2rxen = 0;
 406         adap_ewrap->c0txen = adap_ewrap->c1txen = adap_ewrap->c2txen = 0;
 407         adap_ewrap->c0miscen = adap_ewrap->c1miscen = adap_ewrap->c2miscen = 0;
 408 #endif
 409         rx_desc = emac_rx_desc;
 410
 411         writel(1, &adap_emac->TXCONTROL);
 412         writel(1, &adap_emac->RXCONTROL);
 413
 414         davinci_eth_set_mac_addr(dev);
 415
 416         /* Set DMA 8 TX / 8 RX Head pointers to 0 */
 417         addr = &adap_emac->TX0HDP;
 418         for(cnt = 0; cnt < 16; cnt++)
 419                 writel(0, addr++);
 420
 421         addr = &adap_emac->RX0HDP;
 422         for(cnt = 0; cnt < 16; cnt++)
 423                 writel(0, addr++);
 424
 425         /* Clear Statistics (do this before setting MacControl register) */
 426         addr = &adap_emac->RXGOODFRAMES;
 427         for(cnt = 0; cnt < EMAC_NUM_STATS; cnt++)
 428                 writel(0, addr++);
 429
 430         /* No multicast addressing */
 431         writel(0, &adap_emac->MACHASH1);
 432         writel(0, &adap_emac->MACHASH2);
 433
 434         /* Create RX queue and set receive process in place */
 435         emac_rx_active_head = emac_rx_desc;
 436         for (cnt = 0; cnt < EMAC_MAX_RX_BUFFERS; cnt++) {
 437                 rx_desc->next = (u_int32_t)(rx_desc + 1);
 438                 rx_desc->buffer = &emac_rx_buffers[cnt * (EMAC_MAX_ETHERNET_PKT_SIZE + EMAC_PKT_ALIGN)];
 439                 rx_desc->buff_off_len = EMAC_MAX_ETHERNET_PKT_SIZE;
 440                 rx_desc->pkt_flag_len = EMAC_CPPI_OWNERSHIP_BIT;
 441                 rx_desc++;
 442         }
 443
 444         /* Finalize the rx desc list */
 445         rx_desc--;
 446         rx_desc->next = 0;
 447         emac_rx_active_tail = rx_desc;
 448         emac_rx_queue_active = 1;
 449
 450         /* Enable TX/RX */
 451         writel(EMAC_MAX_ETHERNET_PKT_SIZE, &adap_emac->RXMAXLEN);
 452         writel(0, &adap_emac->RXBUFFEROFFSET);
 453
 454         /*
 455          * No fancy configs - Use this for promiscous debug
 456          *   - EMAC_RXMBPENABLE_RXCAFEN_ENABLE
 457          */
 458         writel(EMAC_RXMBPENABLE_RXBROADEN, &adap_emac->RXMBPENABLE);
 459
 460         /* Enable ch 0 only */
 461         writel(1, &adap_emac->RXUNICASTSET);
 462
 463         /* Enable MII interface and Full duplex mode */
 464 #ifdef CONFIG_SOC_DA8XX
 465         writel((EMAC_MACCONTROL_MIIEN_ENABLE |
 466                 EMAC_MACCONTROL_FULLDUPLEX_ENABLE |
 467                 EMAC_MACCONTROL_RMIISPEED_100),
 468                &adap_emac->MACCONTROL);
 469 #else
 470         writel((EMAC_MACCONTROL_MIIEN_ENABLE |
 471                 EMAC_MACCONTROL_FULLDUPLEX_ENABLE),
 472                &adap_emac->MACCONTROL);
 473 #endif
 474
 475         /* Init MDIO & get link state */
 476         clkdiv = (EMAC_MDIO_BUS_FREQ / EMAC_MDIO_CLOCK_FREQ) - 1;
 477         writel((clkdiv & 0xff) | MDIO_CONTROL_ENABLE | MDIO_CONTROL_FAULT,
 478                &adap_mdio->CONTROL);
 479
 480         /* We need to wait for MDIO to start */
 481         udelay(1000);
 482
 483         index = get_active_phy();
 484         if (index == -1)
 485                 return(0);
 486
 487         emac_gigabit_enable();
 488
 489         /* Start receive process */
 490         writel((u_int32_t)emac_rx_desc, &adap_emac->RX0HDP);
 491
 492         debug_emac("- emac_open\n");
 493
 494         return(1);
 495 }
 496
 497 /* EMAC Channel Teardown */
 498 static void davinci_eth_ch_teardown(int ch)
 499 {
 500         dv_reg          dly = 0xff;
 501         dv_reg          cnt;
 502
 503         debug_emac("+ emac_ch_teardown\n");
 504
 505         if (ch == EMAC_CH_TX) {
 506                 /* Init TX channel teardown */
 507                 writel(0, &adap_emac->TXTEARDOWN);
 508                 do {
 509                         /*
 510                          * Wait here for Tx teardown completion interrupt to
 511                          * occur. Note: A task delay can be called here to pend
 512                          * rather than occupying CPU cycles - anyway it has
 513                          * been found that teardown takes very few cpu cycles
 514                          * and does not affect functionality
 515                          */
 516                         dly--;
 517                         udelay(1);
 518                         if (dly == 0)
 519                                 break;
 520                         cnt = readl(&adap_emac->TX0CP);
 521                 } while (cnt != 0xfffffffc);
 522                 writel(cnt, &adap_emac->TX0CP);
 523                 writel(0, &adap_emac->TX0HDP);
 524         } else {
 525                 /* Init RX channel teardown */
 526                 writel(0, &adap_emac->RXTEARDOWN);
 527                 do {
 528                         /*
 529                          * Wait here for Rx teardown completion interrupt to
 530                          * occur. Note: A task delay can be called here to pend
 531                          * rather than occupying CPU cycles - anyway it has
 532                          * been found that teardown takes very few cpu cycles
 533                          * and does not affect functionality
 534                          */
 535                         dly--;
 536                         udelay(1);
 537                         if (dly == 0)
 538                                 break;
 539                         cnt = readl(&adap_emac->RX0CP);
 540                 } while (cnt != 0xfffffffc);
 541                 writel(cnt, &adap_emac->RX0CP);
 542                 writel(0, &adap_emac->RX0HDP);
 543         }
 544
 545         debug_emac("- emac_ch_teardown\n");
 546 }
 547
 548 /* Eth device close */
 549 static void davinci_eth_close(struct eth_device *dev)
 550 {
 551         debug_emac("+ emac_close\n");
 552
 553         davinci_eth_ch_teardown(EMAC_CH_TX);    /* TX Channel teardown */
 554         davinci_eth_ch_teardown(EMAC_CH_RX);    /* RX Channel teardown */
 555
 556         /* Reset EMAC module and disable interrupts in wrapper */
 557         writel(1, &adap_emac->SOFTRESET);
 558 #if defined(DAVINCI_EMAC_VERSION2)
 559         writel(1, &adap_ewrap->softrst);
 560 #else
 561         writel(0, &adap_ewrap->EWCTL);
 562 #endif
 563
 564 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 565         defined(CONFIG_MACH_DAVINCI_DA850_EVM)
 566         adap_ewrap->c0rxen = adap_ewrap->c1rxen = adap_ewrap->c2rxen = 0;
 567         adap_ewrap->c0txen = adap_ewrap->c1txen = adap_ewrap->c2txen = 0;
 568         adap_ewrap->c0miscen = adap_ewrap->c1miscen = adap_ewrap->c2miscen = 0;
 569 #endif
 570         debug_emac("- emac_close\n");
 571 }
 572
 573 static int tx_send_loop = 0;
 574
 575 /*
 576  * This function sends a single packet on the network and returns
 577  * positive number (number of bytes transmitted) or negative for error
 578  */
 579 static int davinci_eth_send_packet (struct eth_device *dev,
 580                                         volatile void *packet, int length)
 581 {
 582         int ret_status = -1;
 583         int index;
 584         tx_send_loop = 0;
 585
 586         index = get_active_phy();
 587         if (index == -1) {
 588                 printf(" WARN: emac_send_packet: No link\n");
 589                 return (ret_status);
 590         }
 591
 592         emac_gigabit_enable();
 593
 594         /* Check packet size and if < EMAC_MIN_ETHERNET_PKT_SIZE, pad it up */
 595         if (length < EMAC_MIN_ETHERNET_PKT_SIZE) {
 596                 length = EMAC_MIN_ETHERNET_PKT_SIZE;
 597         }
 598
 599         /* Populate the TX descriptor */
 600         emac_tx_desc->next = 0;
 601         emac_tx_desc->buffer = (u_int8_t *) packet;
 602         emac_tx_desc->buff_off_len = (length & 0xffff);
 603         emac_tx_desc->pkt_flag_len = ((length & 0xffff) |
 604                                       EMAC_CPPI_SOP_BIT |
 605                                       EMAC_CPPI_OWNERSHIP_BIT |
 606                                       EMAC_CPPI_EOP_BIT);
 607         /* Send the packet */
 608         writel((unsigned long)emac_tx_desc, &adap_emac->TX0HDP);
 609
 610         /* Wait for packet to complete or link down */
 611         while (1) {
 612                 if (!phy[index].get_link_speed(active_phy_addr[index])) {
 613                         davinci_eth_ch_teardown (EMAC_CH_TX);
 614                         return (ret_status);
 615                 }
 616
 617                 emac_gigabit_enable();
 618
 619                 if (readl(&adap_emac->TXINTSTATRAW) & 0x01) {
 620                         ret_status = length;
 621                         break;
 622                 }
 623                 tx_send_loop++;
 624         }
 625
 626         return (ret_status);
 627 }
 628
 629 /*
 630  * This function handles receipt of a packet from the network
 631  */
 632 static int davinci_eth_rcv_packet (struct eth_device *dev)
 633 {
 634         volatile emac_desc *rx_curr_desc;
 635         volatile emac_desc *curr_desc;
 636         volatile emac_desc *tail_desc;
 637         int status, ret = -1;
 638
 639         rx_curr_desc = emac_rx_active_head;
 640         status = rx_curr_desc->pkt_flag_len;
 641         if ((rx_curr_desc) && ((status & EMAC_CPPI_OWNERSHIP_BIT) == 0)) {
 642                 if (status & EMAC_CPPI_RX_ERROR_FRAME) {
 643                         /* Error in packet - discard it and requeue desc */
 644                         printf ("WARN: emac_rcv_pkt: Error in packet\n");
 645                 } else {
 646                         NetReceive (rx_curr_desc->buffer,
 647                                     (rx_curr_desc->buff_off_len & 0xffff));
 648                         ret = rx_curr_desc->buff_off_len & 0xffff;
 649                 }
 650
 651                 /* Ack received packet descriptor */
 652                 writel((unsigned long)rx_curr_desc, &adap_emac->RX0CP);
 653                 curr_desc = rx_curr_desc;
 654                 emac_rx_active_head =
 655                         (volatile emac_desc *) rx_curr_desc->next;
 656
 657                 if (status & EMAC_CPPI_EOQ_BIT) {
 658                         if (emac_rx_active_head) {
 659                                 writel((unsigned long)emac_rx_active_head,
 660                                        &adap_emac->RX0HDP);
 661                         } else {
 662                                 emac_rx_queue_active = 0;
 663                                 printf ("INFO:emac_rcv_packet: RX Queue not active\n");
 664                         }
 665                 }
 666
 667                 /* Recycle RX descriptor */
 668                 rx_curr_desc->buff_off_len = EMAC_MAX_ETHERNET_PKT_SIZE;
 669                 rx_curr_desc->pkt_flag_len = EMAC_CPPI_OWNERSHIP_BIT;
 670                 rx_curr_desc->next = 0;
 671
 672                 if (emac_rx_active_head == 0) {
 673                         printf ("INFO: emac_rcv_pkt: active queue head = 0\n");
 674                         emac_rx_active_head = curr_desc;
 675                         emac_rx_active_tail = curr_desc;
 676                         if (emac_rx_queue_active != 0) {
 677                                 writel((unsigned long)emac_rx_active_head,
 678                                        &adap_emac->RX0HDP);
 679                                 printf ("INFO: emac_rcv_pkt: active queue head = 0, HDP fired\n");
 680                                 emac_rx_queue_active = 1;
 681                         }
 682                 } else {
 683                         tail_desc = emac_rx_active_tail;
 684                         emac_rx_active_tail = curr_desc;
 685                         tail_desc->next = (unsigned int) curr_desc;
 686                         status = tail_desc->pkt_flag_len;
 687                         if (status & EMAC_CPPI_EOQ_BIT) {
 688                                 writel((unsigned long)curr_desc,
 689                                        &adap_emac->RX0HDP);
 690                                 status &= ~EMAC_CPPI_EOQ_BIT;
 691                                 tail_desc->pkt_flag_len = status;
 692                         }
 693                 }
 694                 return (ret);
 695         }
 696         return (0);
 697 }
 698
 699 /*
 700  * This function initializes the emac hardware. It does NOT initialize
 701  * EMAC modules power or pin multiplexors, that is done by board_init()
 702  * much earlier in bootup process. Returns 1 on success, 0 otherwise.
 703  */
 704 int davinci_emac_initialize(void)
 705 {
 706         u_int32_t       phy_id;
 707         u_int16_t       tmp;
 708         int             i;
 709         int             ret;
 710         struct eth_device *dev;
 711
 712         dev = malloc(sizeof *dev);
 713
 714         if (dev == NULL)
 715                 return -1;
 716
 717         memset(dev, 0, sizeof *dev);
 718         sprintf(dev->name, "DaVinci-EMAC");
 719
 720         dev->iobase = 0;
 721         dev->init = davinci_eth_open;
 722         dev->halt = davinci_eth_close;
 723         dev->send = davinci_eth_send_packet;
 724         dev->recv = davinci_eth_rcv_packet;
 725         dev->write_hwaddr = davinci_eth_set_mac_addr;
 726
 727         eth_register(dev);
 728
 729         davinci_eth_mdio_enable();
 730
 731         /* let the EMAC detect the PHYs */
 732         udelay(5000);
 733
 734         for (i = 0; i < 256; i++) {
 735                 if (readl(&adap_mdio->ALIVE))
 736                         break;
 737                 udelay(1000);
 738         }
 739
 740         if (i >= 256) {
 741                 printf("No ETH PHY detected!!!\n");
 742                 return(0);
 743         }
 744
 745         /* Find if PHY(s) is/are connected */
 746         ret = davinci_eth_phy_detect();
 747         if (!ret)
 748                 return(0);
 749         else
 750                 printf(" %d ETH PHY detected\n", ret);
 751
 752         /* Get PHY ID and initialize phy_ops for a detected PHY */
 753         for (i = 0; i < num_phy; i++) {
 754                 if (!davinci_eth_phy_read(active_phy_addr[i], MII_PHYSID1,
 755                                                         &tmp)) {
 756                         active_phy_addr[i] = 0xff;
 757                         continue;
 758                 }
 759
 760                 phy_id = (tmp << 16) & 0xffff0000;
 761
 762                 if (!davinci_eth_phy_read(active_phy_addr[i], MII_PHYSID2,
 763                                                         &tmp)) {
 764                         active_phy_addr[i] = 0xff;
 765                         continue;
 766                 }
 767
 768                 phy_id |= tmp & 0x0000ffff;
 769
 770                 switch (phy_id) {
 771                 case PHY_KSZ8873:
 772                         sprintf(phy[i].name, "KSZ8873 @ 0x%02x",
 773                                                 active_phy_addr[i]);
 774                         phy[i].init = ksz8873_init_phy;
 775                         phy[i].is_phy_connected = ksz8873_is_phy_connected;
 776                         phy[i].get_link_speed = ksz8873_get_link_speed;
 777                         phy[i].auto_negotiate = ksz8873_auto_negotiate;
 778                         break;
 779                 case PHY_LXT972:
 780                         sprintf(phy[i].name, "LXT972 @ 0x%02x",
 781                                                 active_phy_addr[i]);
 782                         phy[i].init = lxt972_init_phy;
 783                         phy[i].is_phy_connected = lxt972_is_phy_connected;
 784                         phy[i].get_link_speed = lxt972_get_link_speed;
 785                         phy[i].auto_negotiate = lxt972_auto_negotiate;
 786                         break;
 787                 case PHY_DP83848:
 788                         sprintf(phy[i].name, "DP83848 @ 0x%02x",
 789                                                 active_phy_addr[i]);
 790                         phy[i].init = dp83848_init_phy;
 791                         phy[i].is_phy_connected = dp83848_is_phy_connected;
 792                         phy[i].get_link_speed = dp83848_get_link_speed;
 793                         phy[i].auto_negotiate = dp83848_auto_negotiate;
 794                         break;
 795                 case PHY_ET1011C:
 796                         sprintf(phy[i].name, "ET1011C @ 0x%02x",
 797                                                 active_phy_addr[i]);
 798                         phy[i].init = gen_init_phy;
 799                         phy[i].is_phy_connected = gen_is_phy_connected;
 800                         phy[i].get_link_speed = et1011c_get_link_speed;
 801                         phy[i].auto_negotiate = gen_auto_negotiate;
 802                         break;
 803                 default:
 804                         sprintf(phy[i].name, "GENERIC @ 0x%02x",
 805                                                 active_phy_addr[i]);
 806                         phy[i].init = gen_init_phy;
 807                         phy[i].is_phy_connected = gen_is_phy_connected;
 808                         phy[i].get_link_speed = gen_get_link_speed;
 809                         phy[i].auto_negotiate = gen_auto_negotiate;
 810                 }
 811
 812                 debug("Ethernet PHY: %s\n", phy.name);
 813
 814                 miiphy_register(phy[i].name, davinci_mii_phy_read,
 815                                                 davinci_mii_phy_write);
 816         }
 817         return(1);
 818 }