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 /* PHY address for a discovered PHY (0xff - not found) */
  84 static volatile u_int8_t        active_phy_addr = 0xff;
  85
  86 phy_t                           phy;
  87
  88 static int davinci_eth_set_mac_addr(struct eth_device *dev)
  89 {
  90         unsigned long           mac_hi;
  91         unsigned long           mac_lo;
  92
  93         /*
  94          * Set MAC Addresses & Init multicast Hash to 0 (disable any multicast
  95          * receive)
  96          *  Using channel 0 only - other channels are disabled
  97          *  */
  98         writel(0, &adap_emac->MACINDEX);
  99         mac_hi = (dev->enetaddr[3] << 24) |
 100                  (dev->enetaddr[2] << 16) |
 101                  (dev->enetaddr[1] << 8)  |
 102                  (dev->enetaddr[0]);
 103         mac_lo = (dev->enetaddr[5] << 8) |
 104                  (dev->enetaddr[4]);
 105
 106         writel(mac_hi, &adap_emac->MACADDRHI);
 107 #if defined(DAVINCI_EMAC_VERSION2)
 108         writel(mac_lo | EMAC_MAC_ADDR_IS_VALID | EMAC_MAC_ADDR_MATCH,
 109                &adap_emac->MACADDRLO);
 110 #else
 111         writel(mac_lo, &adap_emac->MACADDRLO);
 112 #endif
 113
 114         writel(0, &adap_emac->MACHASH1);
 115         writel(0, &adap_emac->MACHASH2);
 116
 117         /* Set source MAC address - REQUIRED */
 118         writel(mac_hi, &adap_emac->MACSRCADDRHI);
 119         writel(mac_lo, &adap_emac->MACSRCADDRLO);
 120
 121
 122         return 0;
 123 }
 124
 125 static void davinci_eth_mdio_enable(void)
 126 {
 127         u_int32_t       clkdiv;
 128
 129         clkdiv = (EMAC_MDIO_BUS_FREQ / EMAC_MDIO_CLOCK_FREQ) - 1;
 130
 131         writel((clkdiv & 0xff) |
 132                MDIO_CONTROL_ENABLE |
 133                MDIO_CONTROL_FAULT |
 134                MDIO_CONTROL_FAULT_ENABLE,
 135                &adap_mdio->CONTROL);
 136
 137         while (readl(&adap_mdio->CONTROL) & MDIO_CONTROL_IDLE)
 138                 ;
 139 }
 140
 141 /*
 142  * Tries to find an active connected PHY. Returns 1 if address if found.
 143  * If no active PHY (or more than one PHY) found returns 0.
 144  * Sets active_phy_addr variable.
 145  */
 146 static int davinci_eth_phy_detect(void)
 147 {
 148         u_int32_t       phy_act_state;
 149         int             i;
 150
 151         active_phy_addr = 0xff;
 152
 153         phy_act_state = readl(&adap_mdio->ALIVE) & EMAC_MDIO_PHY_MASK;
 154         if (phy_act_state == 0)
 155                 return(0);                              /* No active PHYs */
 156
 157         debug_emac("davinci_eth_phy_detect(), ALIVE = 0x%08x\n", phy_act_state);
 158
 159         for (i = 0; i < 32; i++) {
 160                 if (phy_act_state & (1 << i)) {
 161                         if (phy_act_state & ~(1 << i))
 162                                 return(0);              /* More than one PHY */
 163                         else {
 164                                 active_phy_addr = i;
 165                                 return(1);
 166                         }
 167                 }
 168         }
 169
 170         return(0);      /* Just to make GCC happy */
 171 }
 172
 173
 174 /* Read a PHY register via MDIO inteface. Returns 1 on success, 0 otherwise */
 175 int davinci_eth_phy_read(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t *data)
 176 {
 177         int     tmp;
 178
 179         while (readl(&adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO)
 180                 ;
 181
 182         writel(MDIO_USERACCESS0_GO |
 183                MDIO_USERACCESS0_WRITE_READ |
 184                ((reg_num & 0x1f) << 21) |
 185                ((phy_addr & 0x1f) << 16),
 186                &adap_mdio->USERACCESS0);
 187
 188         /* Wait for command to complete */
 189         while ((tmp = readl(&adap_mdio->USERACCESS0)) & MDIO_USERACCESS0_GO)
 190                 ;
 191
 192         if (tmp & MDIO_USERACCESS0_ACK) {
 193                 *data = tmp & 0xffff;
 194                 return(1);
 195         }
 196
 197         *data = -1;
 198         return(0);
 199 }
 200
 201 /* Write to a PHY register via MDIO inteface. Blocks until operation is complete. */
 202 int davinci_eth_phy_write(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t data)
 203 {
 204
 205         while (readl(&adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO)
 206                 ;
 207
 208         writel(MDIO_USERACCESS0_GO |
 209                MDIO_USERACCESS0_WRITE_WRITE |
 210                ((reg_num & 0x1f) << 21) |
 211                ((phy_addr & 0x1f) << 16) |
 212                (data & 0xffff),
 213                &adap_mdio->USERACCESS0);
 214
 215         /* Wait for command to complete */
 216         while (readl(&adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO)
 217                 ;
 218
 219         return(1);
 220 }
 221
 222 /* PHY functions for a generic PHY */
 223 static int gen_init_phy(int phy_addr)
 224 {
 225         int     ret = 1;
 226
 227         if (gen_get_link_speed(phy_addr)) {
 228                 /* Try another time */
 229                 ret = gen_get_link_speed(phy_addr);
 230         }
 231
 232         return(ret);
 233 }
 234
 235 static int gen_is_phy_connected(int phy_addr)
 236 {
 237         u_int16_t       dummy;
 238
 239         return(davinci_eth_phy_read(phy_addr, PHY_PHYIDR1, &dummy));
 240 }
 241
 242 static int gen_get_link_speed(int phy_addr)
 243 {
 244         u_int16_t       tmp;
 245
 246         if (davinci_eth_phy_read(phy_addr, MII_STATUS_REG, &tmp) &&
 247                         (tmp & 0x04)) {
 248 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 249                 defined(CONFIG_MACH_DAVINCI_DA850_EVM)
 250                 davinci_eth_phy_read(phy_addr, PHY_ANLPAR, &tmp);
 251
 252                 /* Speed doesn't matter, there is no setting for it in EMAC. */
 253                 if (tmp & (PHY_ANLPAR_TXFD | PHY_ANLPAR_10FD)) {
 254                         /* set EMAC for Full Duplex  */
 255                         writel(EMAC_MACCONTROL_MIIEN_ENABLE |
 256                                         EMAC_MACCONTROL_FULLDUPLEX_ENABLE,
 257                                         &adap_emac->MACCONTROL);
 258                 } else {
 259                         /*set EMAC for Half Duplex  */
 260                         writel(EMAC_MACCONTROL_MIIEN_ENABLE,
 261                                         &adap_emac->MACCONTROL);
 262                 }
 263
 264                 if (tmp & (PHY_ANLPAR_TXFD | PHY_ANLPAR_TX))
 265                         writel(readl(&adap_emac->MACCONTROL) |
 266                                         EMAC_MACCONTROL_RMIISPEED_100,
 267                                          &adap_emac->MACCONTROL);
 268                 else
 269                         writel(readl(&adap_emac->MACCONTROL) &
 270                                         ~EMAC_MACCONTROL_RMIISPEED_100,
 271                                          &adap_emac->MACCONTROL);
 272 #endif
 273                 return(1);
 274         }
 275
 276         return(0);
 277 }
 278
 279 static int gen_auto_negotiate(int phy_addr)
 280 {
 281         u_int16_t       tmp;
 282
 283         if (!davinci_eth_phy_read(phy_addr, PHY_BMCR, &tmp))
 284                 return(0);
 285
 286         /* Restart Auto_negotiation  */
 287         tmp |= PHY_BMCR_AUTON;
 288         davinci_eth_phy_write(phy_addr, PHY_BMCR, tmp);
 289
 290         /*check AutoNegotiate complete */
 291         udelay (10000);
 292         if (!davinci_eth_phy_read(phy_addr, PHY_BMSR, &tmp))
 293                 return(0);
 294
 295         if (!(tmp & PHY_BMSR_AUTN_COMP))
 296                 return(0);
 297
 298         return(gen_get_link_speed(phy_addr));
 299 }
 300 /* End of generic PHY functions */
 301
 302
 303 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 304 static int davinci_mii_phy_read(const char *devname, unsigned char addr, unsigned char reg, unsigned short *value)
 305 {
 306         return(davinci_eth_phy_read(addr, reg, value) ? 0 : 1);
 307 }
 308
 309 static int davinci_mii_phy_write(const char *devname, unsigned char addr, unsigned char reg, unsigned short value)
 310 {
 311         return(davinci_eth_phy_write(addr, reg, value) ? 0 : 1);
 312 }
 313 #endif
 314
 315 static void  __attribute__((unused)) davinci_eth_gigabit_enable(void)
 316 {
 317         u_int16_t data;
 318
 319         if (davinci_eth_phy_read(EMAC_MDIO_PHY_NUM, 0, &data)) {
 320                 if (data & (1 << 6)) { /* speed selection MSB */
 321                         /*
 322                          * Check if link detected is giga-bit
 323                          * If Gigabit mode detected, enable gigbit in MAC
 324                          */
 325                         writel(EMAC_MACCONTROL_GIGFORCE |
 326                                EMAC_MACCONTROL_GIGABIT_ENABLE,
 327                                &adap_emac->MACCONTROL);
 328                 }
 329         }
 330 }
 331
 332 /* Eth device open */
 333 static int davinci_eth_open(struct eth_device *dev, bd_t *bis)
 334 {
 335         dv_reg_p                addr;
 336         u_int32_t               clkdiv, cnt;
 337         volatile emac_desc      *rx_desc;
 338
 339         debug_emac("+ emac_open\n");
 340
 341         /* Reset EMAC module and disable interrupts in wrapper */
 342         writel(1, &adap_emac->SOFTRESET);
 343         while (readl(&adap_emac->SOFTRESET) != 0)
 344                 ;
 345 #if defined(DAVINCI_EMAC_VERSION2)
 346         writel(1, &adap_ewrap->softrst);
 347         while (readl(&adap_ewrap->softrst) != 0)
 348                 ;
 349 #else
 350         writel(0, &adap_ewrap->EWCTL);
 351         for (cnt = 0; cnt < 5; cnt++) {
 352                 clkdiv = readl(&adap_ewrap->EWCTL);
 353         }
 354 #endif
 355
 356 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 357         defined(CONFIG_MACH_DAVINCI_DA850_EVM)
 358         adap_ewrap->c0rxen = adap_ewrap->c1rxen = adap_ewrap->c2rxen = 0;
 359         adap_ewrap->c0txen = adap_ewrap->c1txen = adap_ewrap->c2txen = 0;
 360         adap_ewrap->c0miscen = adap_ewrap->c1miscen = adap_ewrap->c2miscen = 0;
 361 #endif
 362         rx_desc = emac_rx_desc;
 363
 364         writel(1, &adap_emac->TXCONTROL);
 365         writel(1, &adap_emac->RXCONTROL);
 366
 367         davinci_eth_set_mac_addr(dev);
 368
 369         /* Set DMA 8 TX / 8 RX Head pointers to 0 */
 370         addr = &adap_emac->TX0HDP;
 371         for(cnt = 0; cnt < 16; cnt++)
 372                 writel(0, addr++);
 373
 374         addr = &adap_emac->RX0HDP;
 375         for(cnt = 0; cnt < 16; cnt++)
 376                 writel(0, addr++);
 377
 378         /* Clear Statistics (do this before setting MacControl register) */
 379         addr = &adap_emac->RXGOODFRAMES;
 380         for(cnt = 0; cnt < EMAC_NUM_STATS; cnt++)
 381                 writel(0, addr++);
 382
 383         /* No multicast addressing */
 384         writel(0, &adap_emac->MACHASH1);
 385         writel(0, &adap_emac->MACHASH2);
 386
 387         /* Create RX queue and set receive process in place */
 388         emac_rx_active_head = emac_rx_desc;
 389         for (cnt = 0; cnt < EMAC_MAX_RX_BUFFERS; cnt++) {
 390                 rx_desc->next = (u_int32_t)(rx_desc + 1);
 391                 rx_desc->buffer = &emac_rx_buffers[cnt * (EMAC_MAX_ETHERNET_PKT_SIZE + EMAC_PKT_ALIGN)];
 392                 rx_desc->buff_off_len = EMAC_MAX_ETHERNET_PKT_SIZE;
 393                 rx_desc->pkt_flag_len = EMAC_CPPI_OWNERSHIP_BIT;
 394                 rx_desc++;
 395         }
 396
 397         /* Finalize the rx desc list */
 398         rx_desc--;
 399         rx_desc->next = 0;
 400         emac_rx_active_tail = rx_desc;
 401         emac_rx_queue_active = 1;
 402
 403         /* Enable TX/RX */
 404         writel(EMAC_MAX_ETHERNET_PKT_SIZE, &adap_emac->RXMAXLEN);
 405         writel(0, &adap_emac->RXBUFFEROFFSET);
 406
 407         /*
 408          * No fancy configs - Use this for promiscous debug
 409          *   - EMAC_RXMBPENABLE_RXCAFEN_ENABLE
 410          */
 411         writel(EMAC_RXMBPENABLE_RXBROADEN, &adap_emac->RXMBPENABLE);
 412
 413         /* Enable ch 0 only */
 414         writel(1, &adap_emac->RXUNICASTSET);
 415
 416         /* Enable MII interface and Full duplex mode */
 417 #ifdef CONFIG_SOC_DA8XX
 418         writel((EMAC_MACCONTROL_MIIEN_ENABLE |
 419                 EMAC_MACCONTROL_FULLDUPLEX_ENABLE |
 420                 EMAC_MACCONTROL_RMIISPEED_100),
 421                &adap_emac->MACCONTROL);
 422 #else
 423         writel((EMAC_MACCONTROL_MIIEN_ENABLE |
 424                 EMAC_MACCONTROL_FULLDUPLEX_ENABLE),
 425                &adap_emac->MACCONTROL);
 426 #endif
 427
 428         /* Init MDIO & get link state */
 429         clkdiv = (EMAC_MDIO_BUS_FREQ / EMAC_MDIO_CLOCK_FREQ) - 1;
 430         writel((clkdiv & 0xff) | MDIO_CONTROL_ENABLE | MDIO_CONTROL_FAULT,
 431                &adap_mdio->CONTROL);
 432
 433         /* We need to wait for MDIO to start */
 434         udelay(1000);
 435
 436         if (!phy.get_link_speed(active_phy_addr))
 437                 return(0);
 438
 439         emac_gigabit_enable();
 440
 441         /* Start receive process */
 442         writel((u_int32_t)emac_rx_desc, &adap_emac->RX0HDP);
 443
 444         debug_emac("- emac_open\n");
 445
 446         return(1);
 447 }
 448
 449 /* EMAC Channel Teardown */
 450 static void davinci_eth_ch_teardown(int ch)
 451 {
 452         dv_reg          dly = 0xff;
 453         dv_reg          cnt;
 454
 455         debug_emac("+ emac_ch_teardown\n");
 456
 457         if (ch == EMAC_CH_TX) {
 458                 /* Init TX channel teardown */
 459                 writel(1, &adap_emac->TXTEARDOWN);
 460                 do {
 461                         /*
 462                          * Wait here for Tx teardown completion interrupt to
 463                          * occur. Note: A task delay can be called here to pend
 464                          * rather than occupying CPU cycles - anyway it has
 465                          * been found that teardown takes very few cpu cycles
 466                          * and does not affect functionality
 467                          */
 468                         dly--;
 469                         udelay(1);
 470                         if (dly == 0)
 471                                 break;
 472                         cnt = readl(&adap_emac->TX0CP);
 473                 } while (cnt != 0xfffffffc);
 474                 writel(cnt, &adap_emac->TX0CP);
 475                 writel(0, &adap_emac->TX0HDP);
 476         } else {
 477                 /* Init RX channel teardown */
 478                 writel(1, &adap_emac->RXTEARDOWN);
 479                 do {
 480                         /*
 481                          * Wait here for Rx teardown completion interrupt to
 482                          * occur. Note: A task delay can be called here to pend
 483                          * rather than occupying CPU cycles - anyway it has
 484                          * been found that teardown takes very few cpu cycles
 485                          * and does not affect functionality
 486                          */
 487                         dly--;
 488                         udelay(1);
 489                         if (dly == 0)
 490                                 break;
 491                         cnt = readl(&adap_emac->RX0CP);
 492                 } while (cnt != 0xfffffffc);
 493                 writel(cnt, &adap_emac->RX0CP);
 494                 writel(0, &adap_emac->RX0HDP);
 495         }
 496
 497         debug_emac("- emac_ch_teardown\n");
 498 }
 499
 500 /* Eth device close */
 501 static void davinci_eth_close(struct eth_device *dev)
 502 {
 503         debug_emac("+ emac_close\n");
 504
 505         davinci_eth_ch_teardown(EMAC_CH_TX);    /* TX Channel teardown */
 506         davinci_eth_ch_teardown(EMAC_CH_RX);    /* RX Channel teardown */
 507
 508         /* Reset EMAC module and disable interrupts in wrapper */
 509         writel(1, &adap_emac->SOFTRESET);
 510 #if defined(DAVINCI_EMAC_VERSION2)
 511         writel(1, &adap_ewrap->softrst);
 512 #else
 513         writel(0, &adap_ewrap->EWCTL);
 514 #endif
 515
 516 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 517         defined(CONFIG_MACH_DAVINCI_DA850_EVM)
 518         adap_ewrap->c0rxen = adap_ewrap->c1rxen = adap_ewrap->c2rxen = 0;
 519         adap_ewrap->c0txen = adap_ewrap->c1txen = adap_ewrap->c2txen = 0;
 520         adap_ewrap->c0miscen = adap_ewrap->c1miscen = adap_ewrap->c2miscen = 0;
 521 #endif
 522         debug_emac("- emac_close\n");
 523 }
 524
 525 static int tx_send_loop = 0;
 526
 527 /*
 528  * This function sends a single packet on the network and returns
 529  * positive number (number of bytes transmitted) or negative for error
 530  */
 531 static int davinci_eth_send_packet (struct eth_device *dev,
 532                                         volatile void *packet, int length)
 533 {
 534         int ret_status = -1;
 535
 536         tx_send_loop = 0;
 537
 538         /* Return error if no link */
 539         if (!phy.get_link_speed (active_phy_addr)) {
 540                 printf ("WARN: emac_send_packet: No link\n");
 541                 return (ret_status);
 542         }
 543
 544         emac_gigabit_enable();
 545
 546         /* Check packet size and if < EMAC_MIN_ETHERNET_PKT_SIZE, pad it up */
 547         if (length < EMAC_MIN_ETHERNET_PKT_SIZE) {
 548                 length = EMAC_MIN_ETHERNET_PKT_SIZE;
 549         }
 550
 551         /* Populate the TX descriptor */
 552         emac_tx_desc->next = 0;
 553         emac_tx_desc->buffer = (u_int8_t *) packet;
 554         emac_tx_desc->buff_off_len = (length & 0xffff);
 555         emac_tx_desc->pkt_flag_len = ((length & 0xffff) |
 556                                       EMAC_CPPI_SOP_BIT |
 557                                       EMAC_CPPI_OWNERSHIP_BIT |
 558                                       EMAC_CPPI_EOP_BIT);
 559         /* Send the packet */
 560         writel((unsigned long)emac_tx_desc, &adap_emac->TX0HDP);
 561
 562         /* Wait for packet to complete or link down */
 563         while (1) {
 564                 if (!phy.get_link_speed (active_phy_addr)) {
 565                         davinci_eth_ch_teardown (EMAC_CH_TX);
 566                         return (ret_status);
 567                 }
 568
 569                 emac_gigabit_enable();
 570
 571                 if (readl(&adap_emac->TXINTSTATRAW) & 0x01) {
 572                         ret_status = length;
 573                         break;
 574                 }
 575                 tx_send_loop++;
 576         }
 577
 578         return (ret_status);
 579 }
 580
 581 /*
 582  * This function handles receipt of a packet from the network
 583  */
 584 static int davinci_eth_rcv_packet (struct eth_device *dev)
 585 {
 586         volatile emac_desc *rx_curr_desc;
 587         volatile emac_desc *curr_desc;
 588         volatile emac_desc *tail_desc;
 589         int status, ret = -1;
 590
 591         rx_curr_desc = emac_rx_active_head;
 592         status = rx_curr_desc->pkt_flag_len;
 593         if ((rx_curr_desc) && ((status & EMAC_CPPI_OWNERSHIP_BIT) == 0)) {
 594                 if (status & EMAC_CPPI_RX_ERROR_FRAME) {
 595                         /* Error in packet - discard it and requeue desc */
 596                         printf ("WARN: emac_rcv_pkt: Error in packet\n");
 597                 } else {
 598                         NetReceive (rx_curr_desc->buffer,
 599                                     (rx_curr_desc->buff_off_len & 0xffff));
 600                         ret = rx_curr_desc->buff_off_len & 0xffff;
 601                 }
 602
 603                 /* Ack received packet descriptor */
 604                 writel((unsigned long)rx_curr_desc, &adap_emac->RX0CP);
 605                 curr_desc = rx_curr_desc;
 606                 emac_rx_active_head =
 607                         (volatile emac_desc *) rx_curr_desc->next;
 608
 609                 if (status & EMAC_CPPI_EOQ_BIT) {
 610                         if (emac_rx_active_head) {
 611                                 writel((unsigned long)emac_rx_active_head,
 612                                        &adap_emac->RX0HDP);
 613                         } else {
 614                                 emac_rx_queue_active = 0;
 615                                 printf ("INFO:emac_rcv_packet: RX Queue not active\n");
 616                         }
 617                 }
 618
 619                 /* Recycle RX descriptor */
 620                 rx_curr_desc->buff_off_len = EMAC_MAX_ETHERNET_PKT_SIZE;
 621                 rx_curr_desc->pkt_flag_len = EMAC_CPPI_OWNERSHIP_BIT;
 622                 rx_curr_desc->next = 0;
 623
 624                 if (emac_rx_active_head == 0) {
 625                         printf ("INFO: emac_rcv_pkt: active queue head = 0\n");
 626                         emac_rx_active_head = curr_desc;
 627                         emac_rx_active_tail = curr_desc;
 628                         if (emac_rx_queue_active != 0) {
 629                                 writel((unsigned long)emac_rx_active_head,
 630                                        &adap_emac->RX0HDP);
 631                                 printf ("INFO: emac_rcv_pkt: active queue head = 0, HDP fired\n");
 632                                 emac_rx_queue_active = 1;
 633                         }
 634                 } else {
 635                         tail_desc = emac_rx_active_tail;
 636                         emac_rx_active_tail = curr_desc;
 637                         tail_desc->next = (unsigned int) curr_desc;
 638                         status = tail_desc->pkt_flag_len;
 639                         if (status & EMAC_CPPI_EOQ_BIT) {
 640                                 writel((unsigned long)curr_desc,
 641                                        &adap_emac->RX0HDP);
 642                                 status &= ~EMAC_CPPI_EOQ_BIT;
 643                                 tail_desc->pkt_flag_len = status;
 644                         }
 645                 }
 646                 return (ret);
 647         }
 648         return (0);
 649 }
 650
 651 /*
 652  * This function initializes the emac hardware. It does NOT initialize
 653  * EMAC modules power or pin multiplexors, that is done by board_init()
 654  * much earlier in bootup process. Returns 1 on success, 0 otherwise.
 655  */
 656 int davinci_emac_initialize(void)
 657 {
 658         u_int32_t       phy_id;
 659         u_int16_t       tmp;
 660         int             i;
 661         struct eth_device *dev;
 662
 663         dev = malloc(sizeof *dev);
 664
 665         if (dev == NULL)
 666                 return -1;
 667
 668         memset(dev, 0, sizeof *dev);
 669
 670         dev->iobase = 0;
 671         dev->init = davinci_eth_open;
 672         dev->halt = davinci_eth_close;
 673         dev->send = davinci_eth_send_packet;
 674         dev->recv = davinci_eth_rcv_packet;
 675         dev->write_hwaddr = davinci_eth_set_mac_addr;
 676
 677         eth_register(dev);
 678
 679         davinci_eth_mdio_enable();
 680
 681         for (i = 0; i < 256; i++) {
 682                 if (readl(&adap_mdio->ALIVE))
 683                         break;
 684                 udelay(10);
 685         }
 686
 687         if (i >= 256) {
 688                 printf("No ETH PHY detected!!!\n");
 689                 return(0);
 690         }
 691
 692         /* Find if a PHY is connected and get it's address */
 693         if (!davinci_eth_phy_detect())
 694                 return(0);
 695
 696         /* Get PHY ID and initialize phy_ops for a detected PHY */
 697         if (!davinci_eth_phy_read(active_phy_addr, PHY_PHYIDR1, &tmp)) {
 698                 active_phy_addr = 0xff;
 699                 return(0);
 700         }
 701
 702         phy_id = (tmp << 16) & 0xffff0000;
 703
 704         if (!davinci_eth_phy_read(active_phy_addr, PHY_PHYIDR2, &tmp)) {
 705                 active_phy_addr = 0xff;
 706                 return(0);
 707         }
 708
 709         phy_id |= tmp & 0x0000ffff;
 710
 711         switch (phy_id) {
 712                 case PHY_LXT972:
 713                         sprintf(phy.name, "LXT972 @ 0x%02x", active_phy_addr);
 714                         phy.init = lxt972_init_phy;
 715                         phy.is_phy_connected = lxt972_is_phy_connected;
 716                         phy.get_link_speed = lxt972_get_link_speed;
 717                         phy.auto_negotiate = lxt972_auto_negotiate;
 718                         break;
 719                 case PHY_DP83848:
 720                         sprintf(phy.name, "DP83848 @ 0x%02x", active_phy_addr);
 721                         phy.init = dp83848_init_phy;
 722                         phy.is_phy_connected = dp83848_is_phy_connected;
 723                         phy.get_link_speed = dp83848_get_link_speed;
 724                         phy.auto_negotiate = dp83848_auto_negotiate;
 725                         break;
 726                 default:
 727                         sprintf(phy.name, "GENERIC @ 0x%02x", active_phy_addr);
 728                         phy.init = gen_init_phy;
 729                         phy.is_phy_connected = gen_is_phy_connected;
 730                         phy.get_link_speed = gen_get_link_speed;
 731                         phy.auto_negotiate = gen_auto_negotiate;
 732         }
 733
 734         printf("Ethernet PHY: %s\n", phy.name);
 735
 736         miiphy_register(phy.name, davinci_mii_phy_read, davinci_mii_phy_write);
 737         return(1);
 738 }