drivers/net/designware.c

   1 /*
   2  * (C) Copyright 2010
   3  * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 /*
  25  * Designware ethernet IP driver for u-boot
  26  */
  27
  28 #include <common.h>
  29 #include <miiphy.h>
  30 #include <malloc.h>
  31 #include <linux/err.h>
  32 #include <asm/io.h>
  33 #include "designware.h"
  34
  35 static void tx_descs_init(struct eth_device *dev)
  36 {
  37         struct dw_eth_dev *priv = dev->priv;
  38         struct eth_dma_regs *dma_p = priv->dma_regs_p;
  39         struct dmamacdescr *desc_table_p = &priv->tx_mac_descrtable[0];
  40         char *txbuffs = &priv->txbuffs[0];
  41         struct dmamacdescr *desc_p;
  42         u32 idx;
  43
  44         for (idx = 0; idx < CONFIG_TX_DESCR_NUM; idx++) {
  45                 desc_p = &desc_table_p[idx];
  46                 desc_p->dmamac_addr = &txbuffs[idx * CONFIG_ETH_BUFSIZE];
  47                 desc_p->dmamac_next = &desc_table_p[idx + 1];
  48
  49 #if defined(CONFIG_DW_ALTDESCRIPTOR)
  50                 desc_p->txrx_status &= ~(DESC_TXSTS_TXINT | DESC_TXSTS_TXLAST |
  51                                 DESC_TXSTS_TXFIRST | DESC_TXSTS_TXCRCDIS | \
  52                                 DESC_TXSTS_TXCHECKINSCTRL | \
  53                                 DESC_TXSTS_TXRINGEND | DESC_TXSTS_TXPADDIS);
  54
  55                 desc_p->txrx_status |= DESC_TXSTS_TXCHAIN;
  56                 desc_p->dmamac_cntl = 0;
  57                 desc_p->txrx_status &= ~(DESC_TXSTS_MSK | DESC_TXSTS_OWNBYDMA);
  58 #else
  59                 desc_p->dmamac_cntl = DESC_TXCTRL_TXCHAIN;
  60                 desc_p->txrx_status = 0;
  61 #endif
  62         }
  63
  64         /* Correcting the last pointer of the chain */
  65         desc_p->dmamac_next = &desc_table_p[0];
  66
  67         writel((ulong)&desc_table_p[0], &dma_p->txdesclistaddr);
  68 }
  69
  70 static void rx_descs_init(struct eth_device *dev)
  71 {
  72         struct dw_eth_dev *priv = dev->priv;
  73         struct eth_dma_regs *dma_p = priv->dma_regs_p;
  74         struct dmamacdescr *desc_table_p = &priv->rx_mac_descrtable[0];
  75         char *rxbuffs = &priv->rxbuffs[0];
  76         struct dmamacdescr *desc_p;
  77         u32 idx;
  78
  79         for (idx = 0; idx < CONFIG_RX_DESCR_NUM; idx++) {
  80                 desc_p = &desc_table_p[idx];
  81                 desc_p->dmamac_addr = &rxbuffs[idx * CONFIG_ETH_BUFSIZE];
  82                 desc_p->dmamac_next = &desc_table_p[idx + 1];
  83
  84                 desc_p->dmamac_cntl =
  85                         (MAC_MAX_FRAME_SZ & DESC_RXCTRL_SIZE1MASK) | \
  86                                       DESC_RXCTRL_RXCHAIN;
  87
  88                 desc_p->txrx_status = DESC_RXSTS_OWNBYDMA;
  89         }
  90
  91         /* Correcting the last pointer of the chain */
  92         desc_p->dmamac_next = &desc_table_p[0];
  93
  94         writel((ulong)&desc_table_p[0], &dma_p->rxdesclistaddr);
  95 }
  96
  97 static void descs_init(struct eth_device *dev)
  98 {
  99         tx_descs_init(dev);
 100         rx_descs_init(dev);
 101 }
 102
 103 static int mac_reset(struct eth_device *dev)
 104 {
 105         struct dw_eth_dev *priv = dev->priv;
 106         struct eth_mac_regs *mac_p = priv->mac_regs_p;
 107         struct eth_dma_regs *dma_p = priv->dma_regs_p;
 108
 109         int timeout = CONFIG_MACRESET_TIMEOUT;
 110
 111         writel(DMAMAC_SRST, &dma_p->busmode);
 112         writel(MII_PORTSELECT, &mac_p->conf);
 113
 114         do {
 115                 if (!(readl(&dma_p->busmode) & DMAMAC_SRST))
 116                         return 0;
 117                 udelay(1000);
 118         } while (timeout--);
 119
 120         return -1;
 121 }
 122
 123 static int dw_write_hwaddr(struct eth_device *dev)
 124 {
 125         struct dw_eth_dev *priv = dev->priv;
 126         struct eth_mac_regs *mac_p = priv->mac_regs_p;
 127         u32 macid_lo, macid_hi;
 128         u8 *mac_id = &dev->enetaddr[0];
 129
 130         macid_lo = mac_id[0] + (mac_id[1] << 8) + \
 131                    (mac_id[2] << 16) + (mac_id[3] << 24);
 132         macid_hi = mac_id[4] + (mac_id[5] << 8);
 133
 134         writel(macid_hi, &mac_p->macaddr0hi);
 135         writel(macid_lo, &mac_p->macaddr0lo);
 136
 137         return 0;
 138 }
 139
 140 static int dw_eth_init(struct eth_device *dev, bd_t *bis)
 141 {
 142         struct dw_eth_dev *priv = dev->priv;
 143         struct eth_mac_regs *mac_p = priv->mac_regs_p;
 144         struct eth_dma_regs *dma_p = priv->dma_regs_p;
 145         u32 conf;
 146
 147         /* Reset ethernet hardware */
 148         if (mac_reset(dev) < 0)
 149                 return -1;
 150
 151         writel(FIXEDBURST | PRIORXTX_41 | BURST_16,
 152                         &dma_p->busmode);
 153
 154         writel(FLUSHTXFIFO | readl(&dma_p->opmode), &dma_p->opmode);
 155         writel(STOREFORWARD | TXSECONDFRAME, &dma_p->opmode);
 156
 157         conf = FRAMEBURSTENABLE | DISABLERXOWN;
 158
 159         if (priv->speed != SPEED_1000M)
 160                 conf |= MII_PORTSELECT;
 161
 162         if (priv->duplex == FULL_DUPLEX)
 163                 conf |= FULLDPLXMODE;
 164
 165         writel(conf, &mac_p->conf);
 166
 167         descs_init(dev);
 168
 169         /*
 170          * Start/Enable xfer at dma as well as mac level
 171          */
 172         writel(readl(&dma_p->opmode) | RXSTART, &dma_p->opmode);
 173         writel(readl(&dma_p->opmode) | TXSTART, &dma_p->opmode);
 174
 175         writel(readl(&mac_p->conf) | RXENABLE, &mac_p->conf);
 176         writel(readl(&mac_p->conf) | TXENABLE, &mac_p->conf);
 177
 178         return 0;
 179 }
 180
 181 static int dw_eth_send(struct eth_device *dev, volatile void *packet,
 182                 int length)
 183 {
 184         struct dw_eth_dev *priv = dev->priv;
 185         struct eth_dma_regs *dma_p = priv->dma_regs_p;
 186         u32 desc_num = priv->tx_currdescnum;
 187         struct dmamacdescr *desc_p = &priv->tx_mac_descrtable[desc_num];
 188
 189         /* Check if the descriptor is owned by CPU */
 190         if (desc_p->txrx_status & DESC_TXSTS_OWNBYDMA) {
 191                 printf("CPU not owner of tx frame\n");
 192                 return -1;
 193         }
 194
 195         memcpy((void *)desc_p->dmamac_addr, (void *)packet, length);
 196
 197 #if defined(CONFIG_DW_ALTDESCRIPTOR)
 198         desc_p->txrx_status |= DESC_TXSTS_TXFIRST | DESC_TXSTS_TXLAST;
 199         desc_p->dmamac_cntl |= (length << DESC_TXCTRL_SIZE1SHFT) & \
 200                                DESC_TXCTRL_SIZE1MASK;
 201
 202         desc_p->txrx_status &= ~(DESC_TXSTS_MSK);
 203         desc_p->txrx_status |= DESC_TXSTS_OWNBYDMA;
 204 #else
 205         desc_p->dmamac_cntl |= ((length << DESC_TXCTRL_SIZE1SHFT) & \
 206                                DESC_TXCTRL_SIZE1MASK) | DESC_TXCTRL_TXLAST | \
 207                                DESC_TXCTRL_TXFIRST;
 208
 209         desc_p->txrx_status = DESC_TXSTS_OWNBYDMA;
 210 #endif
 211
 212         /* Test the wrap-around condition. */
 213         if (++desc_num >= CONFIG_TX_DESCR_NUM)
 214                 desc_num = 0;
 215
 216         priv->tx_currdescnum = desc_num;
 217
 218         /* Start the transmission */
 219         writel(POLL_DATA, &dma_p->txpolldemand);
 220
 221         return 0;
 222 }
 223
 224 static int dw_eth_recv(struct eth_device *dev)
 225 {
 226         struct dw_eth_dev *priv = dev->priv;
 227         u32 desc_num = priv->rx_currdescnum;
 228         struct dmamacdescr *desc_p = &priv->rx_mac_descrtable[desc_num];
 229
 230         u32 status = desc_p->txrx_status;
 231         int length = 0;
 232
 233         /* Check  if the owner is the CPU */
 234         if (!(status & DESC_RXSTS_OWNBYDMA)) {
 235
 236                 length = (status & DESC_RXSTS_FRMLENMSK) >> \
 237                          DESC_RXSTS_FRMLENSHFT;
 238
 239                 NetReceive(desc_p->dmamac_addr, length);
 240
 241                 /*
 242                  * Make the current descriptor valid again and go to
 243                  * the next one
 244                  */
 245                 desc_p->txrx_status |= DESC_RXSTS_OWNBYDMA;
 246
 247                 /* Test the wrap-around condition. */
 248                 if (++desc_num >= CONFIG_RX_DESCR_NUM)
 249                         desc_num = 0;
 250         }
 251
 252         priv->rx_currdescnum = desc_num;
 253
 254         return length;
 255 }
 256
 257 static void dw_eth_halt(struct eth_device *dev)
 258 {
 259         struct dw_eth_dev *priv = dev->priv;
 260
 261         mac_reset(dev);
 262         priv->tx_currdescnum = priv->rx_currdescnum = 0;
 263 }
 264
 265 static int eth_mdio_read(struct eth_device *dev, u8 addr, u8 reg, u16 *val)
 266 {
 267         struct dw_eth_dev *priv = dev->priv;
 268         struct eth_mac_regs *mac_p = priv->mac_regs_p;
 269         u32 miiaddr;
 270         int timeout = CONFIG_MDIO_TIMEOUT;
 271
 272         miiaddr = ((addr << MIIADDRSHIFT) & MII_ADDRMSK) | \
 273                   ((reg << MIIREGSHIFT) & MII_REGMSK);
 274
 275         writel(miiaddr | MII_CLKRANGE_150_250M | MII_BUSY, &mac_p->miiaddr);
 276
 277         do {
 278                 if (!(readl(&mac_p->miiaddr) & MII_BUSY)) {
 279                         *val = readl(&mac_p->miidata);
 280                         return 0;
 281                 }
 282                 udelay(1000);
 283         } while (timeout--);
 284
 285         return -1;
 286 }
 287
 288 static int eth_mdio_write(struct eth_device *dev, u8 addr, u8 reg, u16 val)
 289 {
 290         struct dw_eth_dev *priv = dev->priv;
 291         struct eth_mac_regs *mac_p = priv->mac_regs_p;
 292         u32 miiaddr;
 293         int ret = -1, timeout = CONFIG_MDIO_TIMEOUT;
 294         u16 value;
 295
 296         writel(val, &mac_p->miidata);
 297         miiaddr = ((addr << MIIADDRSHIFT) & MII_ADDRMSK) | \
 298                   ((reg << MIIREGSHIFT) & MII_REGMSK) | MII_WRITE;
 299
 300         writel(miiaddr | MII_CLKRANGE_150_250M | MII_BUSY, &mac_p->miiaddr);
 301
 302         do {
 303                 if (!(readl(&mac_p->miiaddr) & MII_BUSY))
 304                         ret = 0;
 305                 udelay(1000);
 306         } while (timeout--);
 307
 308         /* Needed as a fix for ST-Phy */
 309         eth_mdio_read(dev, addr, reg, &value);
 310
 311         return ret;
 312 }
 313
 314 #if defined(CONFIG_DW_SEARCH_PHY)
 315 static int find_phy(struct eth_device *dev)
 316 {
 317         int phy_addr = 0;
 318         u16 ctrl, oldctrl;
 319
 320         do {
 321                 eth_mdio_read(dev, phy_addr, MII_BMCR, &ctrl);
 322                 oldctrl = ctrl & BMCR_ANENABLE;
 323
 324                 ctrl ^= BMCR_ANENABLE;
 325                 eth_mdio_write(dev, phy_addr, MII_BMCR, ctrl);
 326                 eth_mdio_read(dev, phy_addr, MII_BMCR, &ctrl);
 327                 ctrl &= BMCR_ANENABLE;
 328
 329                 if (ctrl == oldctrl) {
 330                         phy_addr++;
 331                 } else {
 332                         ctrl ^= BMCR_ANENABLE;
 333                         eth_mdio_write(dev, phy_addr, MII_BMCR, ctrl);
 334
 335                         return phy_addr;
 336                 }
 337         } while (phy_addr < 32);
 338
 339         return -1;
 340 }
 341 #endif
 342
 343 static int dw_reset_phy(struct eth_device *dev)
 344 {
 345         struct dw_eth_dev *priv = dev->priv;
 346         u16 ctrl;
 347         int timeout = CONFIG_PHYRESET_TIMEOUT;
 348         u32 phy_addr = priv->address;
 349
 350         eth_mdio_write(dev, phy_addr, MII_BMCR, BMCR_RESET);
 351         do {
 352                 eth_mdio_read(dev, phy_addr, MII_BMCR, &ctrl);
 353                 if (!(ctrl & BMCR_RESET))
 354                         break;
 355                 udelay(1000);
 356         } while (timeout--);
 357
 358         if (timeout < 0)
 359                 return -1;
 360
 361 #ifdef CONFIG_PHY_RESET_DELAY
 362         udelay(CONFIG_PHY_RESET_DELAY);
 363 #endif
 364         return 0;
 365 }
 366
 367 static int configure_phy(struct eth_device *dev)
 368 {
 369         struct dw_eth_dev *priv = dev->priv;
 370         int phy_addr;
 371         u16 bmcr;
 372 #if defined(CONFIG_DW_AUTONEG)
 373         u16 bmsr;
 374         u32 timeout;
 375         u16 anlpar, btsr;
 376 #else
 377         u16 ctrl;
 378 #endif
 379
 380 #if defined(CONFIG_DW_SEARCH_PHY)
 381         phy_addr = find_phy(dev);
 382         if (phy_addr > 0)
 383                 priv->address = phy_addr;
 384         else
 385                 return -1;
 386 #else
 387         phy_addr = priv->address;
 388 #endif
 389         if (dw_reset_phy(dev) < 0)
 390                 return -1;
 391
 392 #if defined(CONFIG_DW_AUTONEG)
 393         bmcr = BMCR_ANENABLE | BMCR_ANRESTART | BMCR_SPEED100 | \
 394                BMCR_FULLDPLX | BMCR_SPEED1000;
 395 #else
 396         bmcr = BMCR_SPEED100 | BMCR_FULLDPLX;
 397
 398 #if defined(CONFIG_DW_SPEED10M)
 399         bmcr &= ~BMCR_SPEED100;
 400 #endif
 401 #if defined(CONFIG_DW_DUPLEXHALF)
 402         bmcr &= ~BMCR_FULLDPLX;
 403 #endif
 404 #endif
 405         if (eth_mdio_write(dev, phy_addr, MII_BMCR, bmcr) < 0)
 406                 return -1;
 407
 408         /* Read the phy status register and populate priv structure */
 409 #if defined(CONFIG_DW_AUTONEG)
 410         timeout = CONFIG_AUTONEG_TIMEOUT;
 411         do {
 412                 eth_mdio_read(dev, phy_addr, MII_BMSR, &bmsr);
 413                 if (bmsr & BMSR_ANEGCOMPLETE)
 414                         break;
 415                 udelay(1000);
 416         } while (timeout--);
 417
 418         eth_mdio_read(dev, phy_addr, MII_LPA, &anlpar);
 419         eth_mdio_read(dev, phy_addr, MII_STAT1000, &btsr);
 420
 421         if (btsr & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) {
 422                 priv->speed = SPEED_1000M;
 423                 if (btsr & PHY_1000BTSR_1000FD)
 424                         priv->duplex = FULL_DUPLEX;
 425                 else
 426                         priv->duplex = HALF_DUPLEX;
 427         } else {
 428                 if (anlpar & LPA_100)
 429                         priv->speed = SPEED_100M;
 430                 else
 431                         priv->speed = SPEED_10M;
 432
 433                 if (anlpar & (LPA_10FULL | LPA_100FULL))
 434                         priv->duplex = FULL_DUPLEX;
 435                 else
 436                         priv->duplex = HALF_DUPLEX;
 437         }
 438 #else
 439         if (eth_mdio_read(dev, phy_addr, MII_BMCR, &ctrl) < 0)
 440                 return -1;
 441
 442         if (ctrl & BMCR_FULLDPLX)
 443                 priv->duplex = FULL_DUPLEX;
 444         else
 445                 priv->duplex = HALF_DUPLEX;
 446
 447         if (ctrl & BMCR_SPEED1000)
 448                 priv->speed = SPEED_1000M;
 449         else if (ctrl & BMCR_SPEED100)
 450                 priv->speed = SPEED_100M;
 451         else
 452                 priv->speed = SPEED_10M;
 453 #endif
 454         return 0;
 455 }
 456
 457 #if defined(CONFIG_MII)
 458 static int dw_mii_read(const char *devname, u8 addr, u8 reg, u16 *val)
 459 {
 460         struct eth_device *dev;
 461
 462         dev = eth_get_dev_by_name(devname);
 463         if (dev)
 464                 eth_mdio_read(dev, addr, reg, val);
 465
 466         return 0;
 467 }
 468
 469 static int dw_mii_write(const char *devname, u8 addr, u8 reg, u16 val)
 470 {
 471         struct eth_device *dev;
 472
 473         dev = eth_get_dev_by_name(devname);
 474         if (dev)
 475                 eth_mdio_write(dev, addr, reg, val);
 476
 477         return 0;
 478 }
 479 #endif
 480
 481 int designware_initialize(u32 id, ulong base_addr, u32 phy_addr)
 482 {
 483         struct eth_device *dev;
 484         struct dw_eth_dev *priv;
 485
 486         dev = (struct eth_device *) malloc(sizeof(struct eth_device));
 487         if (!dev)
 488                 return -ENOMEM;
 489
 490         /*
 491          * Since the priv structure contains the descriptors which need a strict
 492          * buswidth alignment, memalign is used to allocate memory
 493          */
 494         priv = (struct dw_eth_dev *) memalign(16, sizeof(struct dw_eth_dev));
 495         if (!priv) {
 496                 free(dev);
 497                 return -ENOMEM;
 498         }
 499
 500         memset(dev, 0, sizeof(struct eth_device));
 501         memset(priv, 0, sizeof(struct dw_eth_dev));
 502
 503         sprintf(dev->name, "mii%d", id);
 504         dev->iobase = (int)base_addr;
 505         dev->priv = priv;
 506
 507         eth_getenv_enetaddr_by_index(id, &dev->enetaddr[0]);
 508
 509         priv->dev = dev;
 510         priv->mac_regs_p = (struct eth_mac_regs *)base_addr;
 511         priv->dma_regs_p = (struct eth_dma_regs *)(base_addr +
 512                         DW_DMA_BASE_OFFSET);
 513         priv->address = phy_addr;
 514
 515         if (mac_reset(dev) < 0)
 516                 return -1;
 517
 518         if (configure_phy(dev) < 0) {
 519                 printf("Phy could not be configured\n");
 520                 return -1;
 521         }
 522
 523         dev->init = dw_eth_init;
 524         dev->send = dw_eth_send;
 525         dev->recv = dw_eth_recv;
 526         dev->halt = dw_eth_halt;
 527         dev->write_hwaddr = dw_write_hwaddr;
 528
 529         eth_register(dev);
 530
 531 #if defined(CONFIG_MII)
 532         miiphy_register(dev->name, dw_mii_read, dw_mii_write);
 533 #endif
 534         return 1;
 535 }