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 inline void davinci_flush_rx_descs(void)
 112 {
 113         /* flush the whole RX descs area */
 114         flush_dcache_range(EMAC_WRAPPER_RAM_ADDR + EMAC_RX_DESC_BASE,
 115                         EMAC_WRAPPER_RAM_ADDR + EMAC_TX_DESC_BASE);
 116 }
 117
 118 static inline void davinci_invalidate_rx_descs(void)
 119 {
 120         /* invalidate the whole RX descs area */
 121         invalidate_dcache_range(EMAC_WRAPPER_RAM_ADDR + EMAC_RX_DESC_BASE,
 122                         EMAC_WRAPPER_RAM_ADDR + EMAC_TX_DESC_BASE);
 123 }
 124
 125 static inline void davinci_flush_desc(emac_desc *desc)
 126 {
 127         flush_dcache_range((unsigned long)desc,
 128                         (unsigned long)desc + sizeof(*desc));
 129 }
 130
 131 static int davinci_eth_set_mac_addr(struct eth_device *dev)
 132 {
 133         unsigned long           mac_hi;
 134         unsigned long           mac_lo;
 135
 136         /*
 137          * Set MAC Addresses & Init multicast Hash to 0 (disable any multicast
 138          * receive)
 139          *  Using channel 0 only - other channels are disabled
 140          *  */
 141         writel(0, &adap_emac->MACINDEX);
 142         mac_hi = (dev->enetaddr[3] << 24) |
 143                  (dev->enetaddr[2] << 16) |
 144                  (dev->enetaddr[1] << 8)  |
 145                  (dev->enetaddr[0]);
 146         mac_lo = (dev->enetaddr[5] << 8) |
 147                  (dev->enetaddr[4]);
 148
 149         writel(mac_hi, &adap_emac->MACADDRHI);
 150 #if defined(DAVINCI_EMAC_VERSION2)
 151         writel(mac_lo | EMAC_MAC_ADDR_IS_VALID | EMAC_MAC_ADDR_MATCH,
 152                &adap_emac->MACADDRLO);
 153 #else
 154         writel(mac_lo, &adap_emac->MACADDRLO);
 155 #endif
 156
 157         writel(0, &adap_emac->MACHASH1);
 158         writel(0, &adap_emac->MACHASH2);
 159
 160         /* Set source MAC address - REQUIRED */
 161         writel(mac_hi, &adap_emac->MACSRCADDRHI);
 162         writel(mac_lo, &adap_emac->MACSRCADDRLO);
 163
 164
 165         return 0;
 166 }
 167
 168 static void davinci_eth_mdio_enable(void)
 169 {
 170         u_int32_t       clkdiv;
 171
 172         clkdiv = CONFIG_SYS_EMAC_TI_CLKDIV;
 173
 174         writel((clkdiv & 0xff) |
 175                MDIO_CONTROL_ENABLE |
 176                MDIO_CONTROL_FAULT |
 177                MDIO_CONTROL_FAULT_ENABLE,
 178                &adap_mdio->CONTROL);
 179
 180         while (readl(&adap_mdio->CONTROL) & MDIO_CONTROL_IDLE)
 181                 ;
 182 }
 183
 184 /*
 185  * Tries to find an active connected PHY. Returns 1 if address if found.
 186  * If no active PHY (or more than one PHY) found returns 0.
 187  * Sets active_phy_addr variable.
 188  */
 189 static int davinci_eth_phy_detect(void)
 190 {
 191         u_int32_t       phy_act_state;
 192         int             i;
 193         int             j;
 194         unsigned int    count = 0;
 195
 196         for (i = 0; i < CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT; i++)
 197                 active_phy_addr[i] = 0xff;
 198
 199         udelay(1000);
 200         phy_act_state = readl(&adap_mdio->ALIVE);
 201
 202         if (phy_act_state == 0)
 203                 return 0;               /* No active PHYs */
 204
 205         debug_emac("davinci_eth_phy_detect(), ALIVE = 0x%08x\n", phy_act_state);
 206
 207         for (i = 0, j = 0; i < 32; i++)
 208                 if (phy_act_state & (1 << i)) {
 209                         count++;
 210                         if (count <= CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT) {
 211                                 active_phy_addr[j++] = i;
 212                         } else {
 213                                 printf("%s: to many PHYs detected.\n",
 214                                         __func__);
 215                                 count = 0;
 216                                 break;
 217                         }
 218                 }
 219
 220         num_phy = count;
 221
 222         return count;
 223 }
 224
 225
 226 /* Read a PHY register via MDIO inteface. Returns 1 on success, 0 otherwise */
 227 int davinci_eth_phy_read(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t *data)
 228 {
 229         int     tmp;
 230
 231         while (readl(&adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO)
 232                 ;
 233
 234         writel(MDIO_USERACCESS0_GO |
 235                MDIO_USERACCESS0_WRITE_READ |
 236                ((reg_num & 0x1f) << 21) |
 237                ((phy_addr & 0x1f) << 16),
 238                &adap_mdio->USERACCESS0);
 239
 240         /* Wait for command to complete */
 241         while ((tmp = readl(&adap_mdio->USERACCESS0)) & MDIO_USERACCESS0_GO)
 242                 ;
 243
 244         if (tmp & MDIO_USERACCESS0_ACK) {
 245                 *data = tmp & 0xffff;
 246                 return(1);
 247         }
 248
 249         *data = -1;
 250         return(0);
 251 }
 252
 253 /* Write to a PHY register via MDIO inteface. Blocks until operation is complete. */
 254 int davinci_eth_phy_write(u_int8_t phy_addr, u_int8_t reg_num, u_int16_t data)
 255 {
 256
 257         while (readl(&adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO)
 258                 ;
 259
 260         writel(MDIO_USERACCESS0_GO |
 261                MDIO_USERACCESS0_WRITE_WRITE |
 262                ((reg_num & 0x1f) << 21) |
 263                ((phy_addr & 0x1f) << 16) |
 264                (data & 0xffff),
 265                &adap_mdio->USERACCESS0);
 266
 267         /* Wait for command to complete */
 268         while (readl(&adap_mdio->USERACCESS0) & MDIO_USERACCESS0_GO)
 269                 ;
 270
 271         return(1);
 272 }
 273
 274 /* PHY functions for a generic PHY */
 275 static int gen_init_phy(int phy_addr)
 276 {
 277         int     ret = 1;
 278
 279         if (gen_get_link_speed(phy_addr)) {
 280                 /* Try another time */
 281                 ret = gen_get_link_speed(phy_addr);
 282         }
 283
 284         return(ret);
 285 }
 286
 287 static int gen_is_phy_connected(int phy_addr)
 288 {
 289         u_int16_t       dummy;
 290
 291         return davinci_eth_phy_read(phy_addr, MII_PHYSID1, &dummy);
 292 }
 293
 294 static int get_active_phy(void)
 295 {
 296         int i;
 297
 298         for (i = 0; i < num_phy; i++)
 299                 if (phy[i].get_link_speed(active_phy_addr[i]))
 300                         return i;
 301
 302         return -1;      /* Return error if no link */
 303 }
 304
 305 static int gen_get_link_speed(int phy_addr)
 306 {
 307         u_int16_t       tmp;
 308
 309         if (davinci_eth_phy_read(phy_addr, MII_STATUS_REG, &tmp) &&
 310                         (tmp & 0x04)) {
 311 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 312                 defined(CONFIG_MACH_DAVINCI_DA850_EVM)
 313                 davinci_eth_phy_read(phy_addr, MII_LPA, &tmp);
 314
 315                 /* Speed doesn't matter, there is no setting for it in EMAC. */
 316                 if (tmp & (LPA_100FULL | LPA_10FULL)) {
 317                         /* set EMAC for Full Duplex  */
 318                         writel(EMAC_MACCONTROL_MIIEN_ENABLE |
 319                                         EMAC_MACCONTROL_FULLDUPLEX_ENABLE,
 320                                         &adap_emac->MACCONTROL);
 321                 } else {
 322                         /*set EMAC for Half Duplex  */
 323                         writel(EMAC_MACCONTROL_MIIEN_ENABLE,
 324                                         &adap_emac->MACCONTROL);
 325                 }
 326
 327                 if (tmp & (LPA_100FULL | LPA_100HALF))
 328                         writel(readl(&adap_emac->MACCONTROL) |
 329                                         EMAC_MACCONTROL_RMIISPEED_100,
 330                                          &adap_emac->MACCONTROL);
 331                 else
 332                         writel(readl(&adap_emac->MACCONTROL) &
 333                                         ~EMAC_MACCONTROL_RMIISPEED_100,
 334                                          &adap_emac->MACCONTROL);
 335 #endif
 336                 return(1);
 337         }
 338
 339         return(0);
 340 }
 341
 342 static int gen_auto_negotiate(int phy_addr)
 343 {
 344         u_int16_t       tmp;
 345         u_int16_t       val;
 346         unsigned long   cntr = 0;
 347
 348         if (!davinci_eth_phy_read(phy_addr, MII_BMCR, &tmp))
 349                 return 0;
 350
 351         val = tmp | BMCR_FULLDPLX | BMCR_ANENABLE |
 352                                                 BMCR_SPEED100;
 353         davinci_eth_phy_write(phy_addr, MII_BMCR, val);
 354
 355         if (!davinci_eth_phy_read(phy_addr, MII_ADVERTISE, &val))
 356                 return 0;
 357
 358         val |= (ADVERTISE_100FULL | ADVERTISE_100HALF | ADVERTISE_10FULL |
 359                                                         ADVERTISE_10HALF);
 360         davinci_eth_phy_write(phy_addr, MII_ADVERTISE, val);
 361
 362         if (!davinci_eth_phy_read(phy_addr, MII_BMCR, &tmp))
 363                 return(0);
 364
 365         /* Restart Auto_negotiation  */
 366         tmp |= BMCR_ANRESTART;
 367         davinci_eth_phy_write(phy_addr, MII_BMCR, tmp);
 368
 369         /*check AutoNegotiate complete */
 370         do {
 371                 udelay(40000);
 372                 if (!davinci_eth_phy_read(phy_addr, MII_BMSR, &tmp))
 373                         return 0;
 374
 375                 if (tmp & BMSR_ANEGCOMPLETE)
 376                         break;
 377
 378                 cntr++;
 379         } while (cntr < 200);
 380
 381         if (!davinci_eth_phy_read(phy_addr, MII_BMSR, &tmp))
 382                 return(0);
 383
 384         if (!(tmp & BMSR_ANEGCOMPLETE))
 385                 return(0);
 386
 387         return(gen_get_link_speed(phy_addr));
 388 }
 389 /* End of generic PHY functions */
 390
 391
 392 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
 393 static int davinci_mii_phy_read(const char *devname, unsigned char addr, unsigned char reg, unsigned short *value)
 394 {
 395         return(davinci_eth_phy_read(addr, reg, value) ? 0 : 1);
 396 }
 397
 398 static int davinci_mii_phy_write(const char *devname, unsigned char addr, unsigned char reg, unsigned short value)
 399 {
 400         return(davinci_eth_phy_write(addr, reg, value) ? 0 : 1);
 401 }
 402 #endif
 403
 404 static void  __attribute__((unused)) davinci_eth_gigabit_enable(int phy_addr)
 405 {
 406         u_int16_t data;
 407
 408         if (davinci_eth_phy_read(phy_addr, 0, &data)) {
 409                 if (data & (1 << 6)) { /* speed selection MSB */
 410                         /*
 411                          * Check if link detected is giga-bit
 412                          * If Gigabit mode detected, enable gigbit in MAC
 413                          */
 414                         writel(readl(&adap_emac->MACCONTROL) |
 415                                 EMAC_MACCONTROL_GIGFORCE |
 416                                 EMAC_MACCONTROL_GIGABIT_ENABLE,
 417                                 &adap_emac->MACCONTROL);
 418                 }
 419         }
 420 }
 421
 422 /* Eth device open */
 423 static int davinci_eth_open(struct eth_device *dev, bd_t *bis)
 424 {
 425         dv_reg_p                addr;
 426         u_int32_t               clkdiv, cnt;
 427         volatile emac_desc      *rx_desc;
 428         int                     index;
 429
 430         debug_emac("+ emac_open\n");
 431
 432         /* Reset EMAC module and disable interrupts in wrapper */
 433         writel(1, &adap_emac->SOFTRESET);
 434         while (readl(&adap_emac->SOFTRESET) != 0)
 435                 ;
 436 #if defined(DAVINCI_EMAC_VERSION2)
 437         writel(1, &adap_ewrap->softrst);
 438         while (readl(&adap_ewrap->softrst) != 0)
 439                 ;
 440 #else
 441         writel(0, &adap_ewrap->EWCTL);
 442         for (cnt = 0; cnt < 5; cnt++) {
 443                 clkdiv = readl(&adap_ewrap->EWCTL);
 444         }
 445 #endif
 446
 447 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 448         defined(CONFIG_MACH_DAVINCI_DA850_EVM)
 449         adap_ewrap->c0rxen = adap_ewrap->c1rxen = adap_ewrap->c2rxen = 0;
 450         adap_ewrap->c0txen = adap_ewrap->c1txen = adap_ewrap->c2txen = 0;
 451         adap_ewrap->c0miscen = adap_ewrap->c1miscen = adap_ewrap->c2miscen = 0;
 452 #endif
 453         rx_desc = emac_rx_desc;
 454
 455         writel(1, &adap_emac->TXCONTROL);
 456         writel(1, &adap_emac->RXCONTROL);
 457
 458         davinci_eth_set_mac_addr(dev);
 459
 460         /* Set DMA 8 TX / 8 RX Head pointers to 0 */
 461         addr = &adap_emac->TX0HDP;
 462         for(cnt = 0; cnt < 16; cnt++)
 463                 writel(0, addr++);
 464
 465         addr = &adap_emac->RX0HDP;
 466         for(cnt = 0; cnt < 16; cnt++)
 467                 writel(0, addr++);
 468
 469         /* Clear Statistics (do this before setting MacControl register) */
 470         addr = &adap_emac->RXGOODFRAMES;
 471         for(cnt = 0; cnt < EMAC_NUM_STATS; cnt++)
 472                 writel(0, addr++);
 473
 474         /* No multicast addressing */
 475         writel(0, &adap_emac->MACHASH1);
 476         writel(0, &adap_emac->MACHASH2);
 477
 478         /* Create RX queue and set receive process in place */
 479         emac_rx_active_head = emac_rx_desc;
 480         for (cnt = 0; cnt < EMAC_MAX_RX_BUFFERS; cnt++) {
 481                 rx_desc->next = BD_TO_HW((u_int32_t)(rx_desc + 1));
 482                 rx_desc->buffer = &emac_rx_buffers[cnt * EMAC_RXBUF_SIZE];
 483                 rx_desc->buff_off_len = EMAC_MAX_ETHERNET_PKT_SIZE;
 484                 rx_desc->pkt_flag_len = EMAC_CPPI_OWNERSHIP_BIT;
 485                 rx_desc++;
 486         }
 487
 488         /* Finalize the rx desc list */
 489         rx_desc--;
 490         rx_desc->next = 0;
 491         emac_rx_active_tail = rx_desc;
 492         emac_rx_queue_active = 1;
 493
 494         davinci_flush_rx_descs();
 495
 496         /* Enable TX/RX */
 497         writel(EMAC_MAX_ETHERNET_PKT_SIZE, &adap_emac->RXMAXLEN);
 498         writel(0, &adap_emac->RXBUFFEROFFSET);
 499
 500         /*
 501          * No fancy configs - Use this for promiscous debug
 502          *   - EMAC_RXMBPENABLE_RXCAFEN_ENABLE
 503          */
 504         writel(EMAC_RXMBPENABLE_RXBROADEN, &adap_emac->RXMBPENABLE);
 505
 506         /* Enable ch 0 only */
 507         writel(1, &adap_emac->RXUNICASTSET);
 508
 509         /* Enable MII interface and Full duplex mode */
 510 #if defined(CONFIG_SOC_DA8XX) || \
 511         (defined(CONFIG_OMAP34XX) && defined(CONFIG_DRIVER_TI_EMAC_USE_RMII))
 512         writel((EMAC_MACCONTROL_MIIEN_ENABLE |
 513                 EMAC_MACCONTROL_FULLDUPLEX_ENABLE |
 514                 EMAC_MACCONTROL_RMIISPEED_100),
 515                &adap_emac->MACCONTROL);
 516 #else
 517         writel((EMAC_MACCONTROL_MIIEN_ENABLE |
 518                 EMAC_MACCONTROL_FULLDUPLEX_ENABLE),
 519                &adap_emac->MACCONTROL);
 520 #endif
 521
 522         /* Init MDIO & get link state */
 523         clkdiv = CONFIG_SYS_EMAC_TI_CLKDIV;
 524         writel((clkdiv & 0xff) | MDIO_CONTROL_ENABLE | MDIO_CONTROL_FAULT,
 525                &adap_mdio->CONTROL);
 526
 527         /* We need to wait for MDIO to start */
 528         udelay(1000);
 529
 530         index = get_active_phy();
 531         if (index == -1)
 532                 return(0);
 533
 534         emac_gigabit_enable(active_phy_addr[index]);
 535
 536         /* Start receive process */
 537         writel(BD_TO_HW((u_int32_t)emac_rx_desc), &adap_emac->RX0HDP);
 538
 539         debug_emac("- emac_open\n");
 540
 541         return(1);
 542 }
 543
 544 /* EMAC Channel Teardown */
 545 static void davinci_eth_ch_teardown(int ch)
 546 {
 547         dv_reg          dly = 0xff;
 548         dv_reg          cnt;
 549
 550         debug_emac("+ emac_ch_teardown\n");
 551
 552         if (ch == EMAC_CH_TX) {
 553                 /* Init TX channel teardown */
 554                 writel(0, &adap_emac->TXTEARDOWN);
 555                 do {
 556                         /*
 557                          * Wait here for Tx teardown completion interrupt to
 558                          * occur. Note: A task delay can be called here to pend
 559                          * rather than occupying CPU cycles - anyway it has
 560                          * been found that teardown takes very few cpu cycles
 561                          * and does not affect functionality
 562                          */
 563                         dly--;
 564                         udelay(1);
 565                         if (dly == 0)
 566                                 break;
 567                         cnt = readl(&adap_emac->TX0CP);
 568                 } while (cnt != 0xfffffffc);
 569                 writel(cnt, &adap_emac->TX0CP);
 570                 writel(0, &adap_emac->TX0HDP);
 571         } else {
 572                 /* Init RX channel teardown */
 573                 writel(0, &adap_emac->RXTEARDOWN);
 574                 do {
 575                         /*
 576                          * Wait here for Rx teardown completion interrupt to
 577                          * occur. Note: A task delay can be called here to pend
 578                          * rather than occupying CPU cycles - anyway it has
 579                          * been found that teardown takes very few cpu cycles
 580                          * and does not affect functionality
 581                          */
 582                         dly--;
 583                         udelay(1);
 584                         if (dly == 0)
 585                                 break;
 586                         cnt = readl(&adap_emac->RX0CP);
 587                 } while (cnt != 0xfffffffc);
 588                 writel(cnt, &adap_emac->RX0CP);
 589                 writel(0, &adap_emac->RX0HDP);
 590         }
 591
 592         debug_emac("- emac_ch_teardown\n");
 593 }
 594
 595 /* Eth device close */
 596 static void davinci_eth_close(struct eth_device *dev)
 597 {
 598         debug_emac("+ emac_close\n");
 599
 600         davinci_eth_ch_teardown(EMAC_CH_TX);    /* TX Channel teardown */
 601         davinci_eth_ch_teardown(EMAC_CH_RX);    /* RX Channel teardown */
 602
 603         /* Reset EMAC module and disable interrupts in wrapper */
 604         writel(1, &adap_emac->SOFTRESET);
 605 #if defined(DAVINCI_EMAC_VERSION2)
 606         writel(1, &adap_ewrap->softrst);
 607 #else
 608         writel(0, &adap_ewrap->EWCTL);
 609 #endif
 610
 611 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 612         defined(CONFIG_MACH_DAVINCI_DA850_EVM)
 613         adap_ewrap->c0rxen = adap_ewrap->c1rxen = adap_ewrap->c2rxen = 0;
 614         adap_ewrap->c0txen = adap_ewrap->c1txen = adap_ewrap->c2txen = 0;
 615         adap_ewrap->c0miscen = adap_ewrap->c1miscen = adap_ewrap->c2miscen = 0;
 616 #endif
 617         debug_emac("- emac_close\n");
 618 }
 619
 620 static int tx_send_loop = 0;
 621
 622 /*
 623  * This function sends a single packet on the network and returns
 624  * positive number (number of bytes transmitted) or negative for error
 625  */
 626 static int davinci_eth_send_packet (struct eth_device *dev,
 627                                         void *packet, int length)
 628 {
 629         int ret_status = -1;
 630         int index;
 631         tx_send_loop = 0;
 632
 633         index = get_active_phy();
 634         if (index == -1) {
 635                 printf(" WARN: emac_send_packet: No link\n");
 636                 return (ret_status);
 637         }
 638
 639         emac_gigabit_enable(active_phy_addr[index]);
 640
 641         /* Check packet size and if < EMAC_MIN_ETHERNET_PKT_SIZE, pad it up */
 642         if (length < EMAC_MIN_ETHERNET_PKT_SIZE) {
 643                 length = EMAC_MIN_ETHERNET_PKT_SIZE;
 644         }
 645
 646         /* Populate the TX descriptor */
 647         emac_tx_desc->next = 0;
 648         emac_tx_desc->buffer = (u_int8_t *) packet;
 649         emac_tx_desc->buff_off_len = (length & 0xffff);
 650         emac_tx_desc->pkt_flag_len = ((length & 0xffff) |
 651                                       EMAC_CPPI_SOP_BIT |
 652                                       EMAC_CPPI_OWNERSHIP_BIT |
 653                                       EMAC_CPPI_EOP_BIT);
 654
 655         flush_dcache_range((unsigned long)packet,
 656                         (unsigned long)packet + length);
 657         davinci_flush_desc(emac_tx_desc);
 658
 659         /* Send the packet */
 660         writel(BD_TO_HW((unsigned long)emac_tx_desc), &adap_emac->TX0HDP);
 661
 662         /* Wait for packet to complete or link down */
 663         while (1) {
 664                 if (!phy[index].get_link_speed(active_phy_addr[index])) {
 665                         davinci_eth_ch_teardown (EMAC_CH_TX);
 666                         return (ret_status);
 667                 }
 668
 669                 emac_gigabit_enable(active_phy_addr[index]);
 670
 671                 if (readl(&adap_emac->TXINTSTATRAW) & 0x01) {
 672                         ret_status = length;
 673                         break;
 674                 }
 675                 tx_send_loop++;
 676         }
 677
 678         return (ret_status);
 679 }
 680
 681 /*
 682  * This function handles receipt of a packet from the network
 683  */
 684 static int davinci_eth_rcv_packet (struct eth_device *dev)
 685 {
 686         volatile emac_desc *rx_curr_desc;
 687         volatile emac_desc *curr_desc;
 688         volatile emac_desc *tail_desc;
 689         int status, ret = -1;
 690
 691         davinci_invalidate_rx_descs();
 692
 693         rx_curr_desc = emac_rx_active_head;
 694         status = rx_curr_desc->pkt_flag_len;
 695         if ((rx_curr_desc) && ((status & EMAC_CPPI_OWNERSHIP_BIT) == 0)) {
 696                 if (status & EMAC_CPPI_RX_ERROR_FRAME) {
 697                         /* Error in packet - discard it and requeue desc */
 698                         printf ("WARN: emac_rcv_pkt: Error in packet\n");
 699                 } else {
 700                         unsigned long tmp = (unsigned long)rx_curr_desc->buffer;
 701
 702                         invalidate_dcache_range(tmp, tmp + EMAC_RXBUF_SIZE);
 703                         net_process_received_packet(
 704                                 rx_curr_desc->buffer,
 705                                 rx_curr_desc->buff_off_len & 0xffff);
 706                         ret = rx_curr_desc->buff_off_len & 0xffff;
 707                 }
 708
 709                 /* Ack received packet descriptor */
 710                 writel(BD_TO_HW((ulong)rx_curr_desc), &adap_emac->RX0CP);
 711                 curr_desc = rx_curr_desc;
 712                 emac_rx_active_head =
 713                         (volatile emac_desc *) (HW_TO_BD(rx_curr_desc->next));
 714
 715                 if (status & EMAC_CPPI_EOQ_BIT) {
 716                         if (emac_rx_active_head) {
 717                                 writel(BD_TO_HW((ulong)emac_rx_active_head),
 718                                        &adap_emac->RX0HDP);
 719                         } else {
 720                                 emac_rx_queue_active = 0;
 721                                 printf ("INFO:emac_rcv_packet: RX Queue not active\n");
 722                         }
 723                 }
 724
 725                 /* Recycle RX descriptor */
 726                 rx_curr_desc->buff_off_len = EMAC_MAX_ETHERNET_PKT_SIZE;
 727                 rx_curr_desc->pkt_flag_len = EMAC_CPPI_OWNERSHIP_BIT;
 728                 rx_curr_desc->next = 0;
 729                 davinci_flush_desc(rx_curr_desc);
 730
 731                 if (emac_rx_active_head == 0) {
 732                         printf ("INFO: emac_rcv_pkt: active queue head = 0\n");
 733                         emac_rx_active_head = curr_desc;
 734                         emac_rx_active_tail = curr_desc;
 735                         if (emac_rx_queue_active != 0) {
 736                                 writel(BD_TO_HW((ulong)emac_rx_active_head),
 737                                        &adap_emac->RX0HDP);
 738                                 printf ("INFO: emac_rcv_pkt: active queue head = 0, HDP fired\n");
 739                                 emac_rx_queue_active = 1;
 740                         }
 741                 } else {
 742                         tail_desc = emac_rx_active_tail;
 743                         emac_rx_active_tail = curr_desc;
 744                         tail_desc->next = BD_TO_HW((ulong) curr_desc);
 745                         status = tail_desc->pkt_flag_len;
 746                         if (status & EMAC_CPPI_EOQ_BIT) {
 747                                 davinci_flush_desc(tail_desc);
 748                                 writel(BD_TO_HW((ulong)curr_desc),
 749                                        &adap_emac->RX0HDP);
 750                                 status &= ~EMAC_CPPI_EOQ_BIT;
 751                                 tail_desc->pkt_flag_len = status;
 752                         }
 753                         davinci_flush_desc(tail_desc);
 754                 }
 755                 return (ret);
 756         }
 757         return (0);
 758 }
 759
 760 /*
 761  * This function initializes the emac hardware. It does NOT initialize
 762  * EMAC modules power or pin multiplexors, that is done by board_init()
 763  * much earlier in bootup process. Returns 1 on success, 0 otherwise.
 764  */
 765 int davinci_emac_initialize(void)
 766 {
 767         u_int32_t       phy_id;
 768         u_int16_t       tmp;
 769         int             i;
 770         int             ret;
 771         struct eth_device *dev;
 772
 773         dev = malloc(sizeof *dev);
 774
 775         if (dev == NULL)
 776                 return -1;
 777
 778         memset(dev, 0, sizeof *dev);
 779         sprintf(dev->name, "DaVinci-EMAC");
 780
 781         dev->iobase = 0;
 782         dev->init = davinci_eth_open;
 783         dev->halt = davinci_eth_close;
 784         dev->send = davinci_eth_send_packet;
 785         dev->recv = davinci_eth_rcv_packet;
 786         dev->write_hwaddr = davinci_eth_set_mac_addr;
 787
 788         eth_register(dev);
 789
 790         davinci_eth_mdio_enable();
 791
 792         /* let the EMAC detect the PHYs */
 793         udelay(5000);
 794
 795         for (i = 0; i < 256; i++) {
 796                 if (readl(&adap_mdio->ALIVE))
 797                         break;
 798                 udelay(1000);
 799         }
 800
 801         if (i >= 256) {
 802                 printf("No ETH PHY detected!!!\n");
 803                 return(0);
 804         }
 805
 806         /* Find if PHY(s) is/are connected */
 807         ret = davinci_eth_phy_detect();
 808         if (!ret)
 809                 return(0);
 810         else
 811                 debug_emac(" %d ETH PHY detected\n", ret);
 812
 813         /* Get PHY ID and initialize phy_ops for a detected PHY */
 814         for (i = 0; i < num_phy; i++) {
 815                 if (!davinci_eth_phy_read(active_phy_addr[i], MII_PHYSID1,
 816                                                         &tmp)) {
 817                         active_phy_addr[i] = 0xff;
 818                         continue;
 819                 }
 820
 821                 phy_id = (tmp << 16) & 0xffff0000;
 822
 823                 if (!davinci_eth_phy_read(active_phy_addr[i], MII_PHYSID2,
 824                                                         &tmp)) {
 825                         active_phy_addr[i] = 0xff;
 826                         continue;
 827                 }
 828
 829                 phy_id |= tmp & 0x0000ffff;
 830
 831                 switch (phy_id) {
 832 #ifdef PHY_KSZ8873
 833                 case PHY_KSZ8873:
 834                         sprintf(phy[i].name, "KSZ8873 @ 0x%02x",
 835                                                 active_phy_addr[i]);
 836                         phy[i].init = ksz8873_init_phy;
 837                         phy[i].is_phy_connected = ksz8873_is_phy_connected;
 838                         phy[i].get_link_speed = ksz8873_get_link_speed;
 839                         phy[i].auto_negotiate = ksz8873_auto_negotiate;
 840                         break;
 841 #endif
 842 #ifdef PHY_LXT972
 843                 case PHY_LXT972:
 844                         sprintf(phy[i].name, "LXT972 @ 0x%02x",
 845                                                 active_phy_addr[i]);
 846                         phy[i].init = lxt972_init_phy;
 847                         phy[i].is_phy_connected = lxt972_is_phy_connected;
 848                         phy[i].get_link_speed = lxt972_get_link_speed;
 849                         phy[i].auto_negotiate = lxt972_auto_negotiate;
 850                         break;
 851 #endif
 852 #ifdef PHY_DP83848
 853                 case PHY_DP83848:
 854                         sprintf(phy[i].name, "DP83848 @ 0x%02x",
 855                                                 active_phy_addr[i]);
 856                         phy[i].init = dp83848_init_phy;
 857                         phy[i].is_phy_connected = dp83848_is_phy_connected;
 858                         phy[i].get_link_speed = dp83848_get_link_speed;
 859                         phy[i].auto_negotiate = dp83848_auto_negotiate;
 860                         break;
 861 #endif
 862 #ifdef PHY_ET1011C
 863                 case PHY_ET1011C:
 864                         sprintf(phy[i].name, "ET1011C @ 0x%02x",
 865                                                 active_phy_addr[i]);
 866                         phy[i].init = gen_init_phy;
 867                         phy[i].is_phy_connected = gen_is_phy_connected;
 868                         phy[i].get_link_speed = et1011c_get_link_speed;
 869                         phy[i].auto_negotiate = gen_auto_negotiate;
 870                         break;
 871 #endif
 872                 default:
 873                         sprintf(phy[i].name, "GENERIC @ 0x%02x",
 874                                                 active_phy_addr[i]);
 875                         phy[i].init = gen_init_phy;
 876                         phy[i].is_phy_connected = gen_is_phy_connected;
 877                         phy[i].get_link_speed = gen_get_link_speed;
 878                         phy[i].auto_negotiate = gen_auto_negotiate;
 879                 }
 880
 881                 debug("Ethernet PHY: %s\n", phy[i].name);
 882
 883                 miiphy_register(phy[i].name, davinci_mii_phy_read,
 884                                                 davinci_mii_phy_write);
 885         }
 886
 887 #if defined(CONFIG_DRIVER_TI_EMAC_USE_RMII) && \
 888                 defined(CONFIG_MACH_DAVINCI_DA850_EVM) && \
 889                         !defined(CONFIG_DRIVER_TI_EMAC_RMII_NO_NEGOTIATE)
 890         for (i = 0; i < num_phy; i++) {
 891                 if (phy[i].is_phy_connected(i))
 892                         phy[i].auto_negotiate(i);
 893         }
 894 #endif
 895         return(1);
 896 }