drivers/net/designware.c

   1 /*
   2  * (C) Copyright 2010
   3  * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 /*
   9  * Designware ethernet IP driver for u-boot
  10  */
  11
  12 #include <common.h>
  13 #include <miiphy.h>
  14 #include <malloc.h>
  15 #include <linux/compiler.h>
  16 #include <linux/err.h>
  17 #include <asm/io.h>
  18 #include "designware.h"
  19
  20 #if !defined(CONFIG_PHYLIB)
  21 # error "DesignWare Ether MAC requires PHYLIB - missing CONFIG_PHYLIB"
  22 #endif
  23
  24 static int dw_mdio_read(struct mii_dev *bus, int addr, int devad, int reg)
  25 {
  26         struct eth_mac_regs *mac_p = bus->priv;
  27         ulong start;
  28         u16 miiaddr;
  29         int timeout = CONFIG_MDIO_TIMEOUT;
  30
  31         miiaddr = ((addr << MIIADDRSHIFT) & MII_ADDRMSK) |
  32                   ((reg << MIIREGSHIFT) & MII_REGMSK);
  33
  34         writel(miiaddr | MII_CLKRANGE_150_250M | MII_BUSY, &mac_p->miiaddr);
  35
  36         start = get_timer(0);
  37         while (get_timer(start) < timeout) {
  38                 if (!(readl(&mac_p->miiaddr) & MII_BUSY))
  39                         return readl(&mac_p->miidata);
  40                 udelay(10);
  41         };
  42
  43         return -1;
  44 }
  45
  46 static int dw_mdio_write(struct mii_dev *bus, int addr, int devad, int reg,
  47                         u16 val)
  48 {
  49         struct eth_mac_regs *mac_p = bus->priv;
  50         ulong start;
  51         u16 miiaddr;
  52         int ret = -1, timeout = CONFIG_MDIO_TIMEOUT;
  53
  54         writel(val, &mac_p->miidata);
  55         miiaddr = ((addr << MIIADDRSHIFT) & MII_ADDRMSK) |
  56                   ((reg << MIIREGSHIFT) & MII_REGMSK) | MII_WRITE;
  57
  58         writel(miiaddr | MII_CLKRANGE_150_250M | MII_BUSY, &mac_p->miiaddr);
  59
  60         start = get_timer(0);
  61         while (get_timer(start) < timeout) {
  62                 if (!(readl(&mac_p->miiaddr) & MII_BUSY)) {
  63                         ret = 0;
  64                         break;
  65                 }
  66                 udelay(10);
  67         };
  68
  69         return ret;
  70 }
  71
  72 static int dw_mdio_init(char *name, struct eth_mac_regs *mac_regs_p)
  73 {
  74         struct mii_dev *bus = mdio_alloc();
  75
  76         if (!bus) {
  77                 printf("Failed to allocate MDIO bus\n");
  78                 return -1;
  79         }
  80
  81         bus->read = dw_mdio_read;
  82         bus->write = dw_mdio_write;
  83         sprintf(bus->name, name);
  84
  85         bus->priv = (void *)mac_regs_p;
  86
  87         return mdio_register(bus);
  88 }
  89
  90 static void tx_descs_init(struct eth_device *dev)
  91 {
  92         struct dw_eth_dev *priv = dev->priv;
  93         struct eth_dma_regs *dma_p = priv->dma_regs_p;
  94         struct dmamacdescr *desc_table_p = &priv->tx_mac_descrtable[0];
  95         char *txbuffs = &priv->txbuffs[0];
  96         struct dmamacdescr *desc_p;
  97         u32 idx;
  98
  99         for (idx = 0; idx < CONFIG_TX_DESCR_NUM; idx++) {
 100                 desc_p = &desc_table_p[idx];
 101                 desc_p->dmamac_addr = &txbuffs[idx * CONFIG_ETH_BUFSIZE];
 102                 desc_p->dmamac_next = &desc_table_p[idx + 1];
 103
 104 #if defined(CONFIG_DW_ALTDESCRIPTOR)
 105                 desc_p->txrx_status &= ~(DESC_TXSTS_TXINT | DESC_TXSTS_TXLAST |
 106                                 DESC_TXSTS_TXFIRST | DESC_TXSTS_TXCRCDIS | \
 107                                 DESC_TXSTS_TXCHECKINSCTRL | \
 108                                 DESC_TXSTS_TXRINGEND | DESC_TXSTS_TXPADDIS);
 109
 110                 desc_p->txrx_status |= DESC_TXSTS_TXCHAIN;
 111                 desc_p->dmamac_cntl = 0;
 112                 desc_p->txrx_status &= ~(DESC_TXSTS_MSK | DESC_TXSTS_OWNBYDMA);
 113 #else
 114                 desc_p->dmamac_cntl = DESC_TXCTRL_TXCHAIN;
 115                 desc_p->txrx_status = 0;
 116 #endif
 117         }
 118
 119         /* Correcting the last pointer of the chain */
 120         desc_p->dmamac_next = &desc_table_p[0];
 121
 122         /* Flush all Tx buffer descriptors at once */
 123         flush_dcache_range((unsigned int)priv->tx_mac_descrtable,
 124                            (unsigned int)priv->tx_mac_descrtable +
 125                            sizeof(priv->tx_mac_descrtable));
 126
 127         writel((ulong)&desc_table_p[0], &dma_p->txdesclistaddr);
 128         priv->tx_currdescnum = 0;
 129 }
 130
 131 static void rx_descs_init(struct eth_device *dev)
 132 {
 133         struct dw_eth_dev *priv = dev->priv;
 134         struct eth_dma_regs *dma_p = priv->dma_regs_p;
 135         struct dmamacdescr *desc_table_p = &priv->rx_mac_descrtable[0];
 136         char *rxbuffs = &priv->rxbuffs[0];
 137         struct dmamacdescr *desc_p;
 138         u32 idx;
 139
 140         /* Before passing buffers to GMAC we need to make sure zeros
 141          * written there right after "priv" structure allocation were
 142          * flushed into RAM.
 143          * Otherwise there's a chance to get some of them flushed in RAM when
 144          * GMAC is already pushing data to RAM via DMA. This way incoming from
 145          * GMAC data will be corrupted. */
 146         flush_dcache_range((unsigned int)rxbuffs, (unsigned int)rxbuffs +
 147                            RX_TOTAL_BUFSIZE);
 148
 149         for (idx = 0; idx < CONFIG_RX_DESCR_NUM; idx++) {
 150                 desc_p = &desc_table_p[idx];
 151                 desc_p->dmamac_addr = &rxbuffs[idx * CONFIG_ETH_BUFSIZE];
 152                 desc_p->dmamac_next = &desc_table_p[idx + 1];
 153
 154                 desc_p->dmamac_cntl =
 155                         (MAC_MAX_FRAME_SZ & DESC_RXCTRL_SIZE1MASK) | \
 156                                       DESC_RXCTRL_RXCHAIN;
 157
 158                 desc_p->txrx_status = DESC_RXSTS_OWNBYDMA;
 159         }
 160
 161         /* Correcting the last pointer of the chain */
 162         desc_p->dmamac_next = &desc_table_p[0];
 163
 164         /* Flush all Rx buffer descriptors at once */
 165         flush_dcache_range((unsigned int)priv->rx_mac_descrtable,
 166                            (unsigned int)priv->rx_mac_descrtable +
 167                            sizeof(priv->rx_mac_descrtable));
 168
 169         writel((ulong)&desc_table_p[0], &dma_p->rxdesclistaddr);
 170         priv->rx_currdescnum = 0;
 171 }
 172
 173 static int dw_write_hwaddr(struct eth_device *dev)
 174 {
 175         struct dw_eth_dev *priv = dev->priv;
 176         struct eth_mac_regs *mac_p = priv->mac_regs_p;
 177         u32 macid_lo, macid_hi;
 178         u8 *mac_id = &dev->enetaddr[0];
 179
 180         macid_lo = mac_id[0] + (mac_id[1] << 8) + (mac_id[2] << 16) +
 181                    (mac_id[3] << 24);
 182         macid_hi = mac_id[4] + (mac_id[5] << 8);
 183
 184         writel(macid_hi, &mac_p->macaddr0hi);
 185         writel(macid_lo, &mac_p->macaddr0lo);
 186
 187         return 0;
 188 }
 189
 190 static void dw_adjust_link(struct eth_mac_regs *mac_p,
 191                            struct phy_device *phydev)
 192 {
 193         u32 conf = readl(&mac_p->conf) | FRAMEBURSTENABLE | DISABLERXOWN;
 194
 195         if (!phydev->link) {
 196                 printf("%s: No link.\n", phydev->dev->name);
 197                 return;
 198         }
 199
 200         if (phydev->speed != 1000)
 201                 conf |= MII_PORTSELECT;
 202
 203         if (phydev->speed == 100)
 204                 conf |= FES_100;
 205
 206         if (phydev->duplex)
 207                 conf |= FULLDPLXMODE;
 208
 209         writel(conf, &mac_p->conf);
 210
 211         printf("Speed: %d, %s duplex%s\n", phydev->speed,
 212                (phydev->duplex) ? "full" : "half",
 213                (phydev->port == PORT_FIBRE) ? ", fiber mode" : "");
 214 }
 215
 216 static void dw_eth_halt(struct eth_device *dev)
 217 {
 218         struct dw_eth_dev *priv = dev->priv;
 219         struct eth_mac_regs *mac_p = priv->mac_regs_p;
 220         struct eth_dma_regs *dma_p = priv->dma_regs_p;
 221
 222         writel(readl(&mac_p->conf) & ~(RXENABLE | TXENABLE), &mac_p->conf);
 223         writel(readl(&dma_p->opmode) & ~(RXSTART | TXSTART), &dma_p->opmode);
 224
 225         phy_shutdown(priv->phydev);
 226 }
 227
 228 static int dw_eth_init(struct eth_device *dev, bd_t *bis)
 229 {
 230         struct dw_eth_dev *priv = dev->priv;
 231         struct eth_mac_regs *mac_p = priv->mac_regs_p;
 232         struct eth_dma_regs *dma_p = priv->dma_regs_p;
 233         unsigned int start;
 234
 235         writel(readl(&dma_p->busmode) | DMAMAC_SRST, &dma_p->busmode);
 236
 237         start = get_timer(0);
 238         while (readl(&dma_p->busmode) & DMAMAC_SRST) {
 239                 if (get_timer(start) >= CONFIG_MACRESET_TIMEOUT)
 240                         return -1;
 241
 242                 mdelay(100);
 243         };
 244
 245         /* Soft reset above clears HW address registers.
 246          * So we have to set it here once again */
 247         dw_write_hwaddr(dev);
 248
 249         rx_descs_init(dev);
 250         tx_descs_init(dev);
 251
 252         writel(FIXEDBURST | PRIORXTX_41 | DMA_PBL, &dma_p->busmode);
 253
 254         writel(readl(&dma_p->opmode) | FLUSHTXFIFO | STOREFORWARD,
 255                &dma_p->opmode);
 256
 257         writel(readl(&dma_p->opmode) | RXSTART | TXSTART, &dma_p->opmode);
 258
 259         /* Start up the PHY */
 260         if (phy_startup(priv->phydev)) {
 261                 printf("Could not initialize PHY %s\n",
 262                        priv->phydev->dev->name);
 263                 return -1;
 264         }
 265
 266         dw_adjust_link(mac_p, priv->phydev);
 267
 268         if (!priv->phydev->link)
 269                 return -1;
 270
 271         writel(readl(&mac_p->conf) | RXENABLE | TXENABLE, &mac_p->conf);
 272
 273         return 0;
 274 }
 275
 276 static int dw_eth_send(struct eth_device *dev, void *packet, int length)
 277 {
 278         struct dw_eth_dev *priv = dev->priv;
 279         struct eth_dma_regs *dma_p = priv->dma_regs_p;
 280         u32 desc_num = priv->tx_currdescnum;
 281         struct dmamacdescr *desc_p = &priv->tx_mac_descrtable[desc_num];
 282
 283         /*
 284          * Strictly we only need to invalidate the "txrx_status" field
 285          * for the following check, but on some platforms we cannot
 286          * invalidate only 4 bytes, so roundup to
 287          * ARCH_DMA_MINALIGN. This is safe because the individual
 288          * descriptors in the array are each aligned to
 289          * ARCH_DMA_MINALIGN.
 290          */
 291         invalidate_dcache_range(
 292                 (unsigned long)desc_p,
 293                 (unsigned long)desc_p +
 294                 roundup(sizeof(desc_p->txrx_status), ARCH_DMA_MINALIGN));
 295
 296         /* Check if the descriptor is owned by CPU */
 297         if (desc_p->txrx_status & DESC_TXSTS_OWNBYDMA) {
 298                 printf("CPU not owner of tx frame\n");
 299                 return -1;
 300         }
 301
 302         memcpy((void *)desc_p->dmamac_addr, packet, length);
 303
 304         /* Flush data to be sent */
 305         flush_dcache_range((unsigned long)desc_p->dmamac_addr,
 306                            (unsigned long)desc_p->dmamac_addr + length);
 307
 308 #if defined(CONFIG_DW_ALTDESCRIPTOR)
 309         desc_p->txrx_status |= DESC_TXSTS_TXFIRST | DESC_TXSTS_TXLAST;
 310         desc_p->dmamac_cntl |= (length << DESC_TXCTRL_SIZE1SHFT) & \
 311                                DESC_TXCTRL_SIZE1MASK;
 312
 313         desc_p->txrx_status &= ~(DESC_TXSTS_MSK);
 314         desc_p->txrx_status |= DESC_TXSTS_OWNBYDMA;
 315 #else
 316         desc_p->dmamac_cntl |= ((length << DESC_TXCTRL_SIZE1SHFT) & \
 317                                DESC_TXCTRL_SIZE1MASK) | DESC_TXCTRL_TXLAST | \
 318                                DESC_TXCTRL_TXFIRST;
 319
 320         desc_p->txrx_status = DESC_TXSTS_OWNBYDMA;
 321 #endif
 322
 323         /* Flush modified buffer descriptor */
 324         flush_dcache_range((unsigned long)desc_p,
 325                            (unsigned long)desc_p + sizeof(struct dmamacdescr));
 326
 327         /* Test the wrap-around condition. */
 328         if (++desc_num >= CONFIG_TX_DESCR_NUM)
 329                 desc_num = 0;
 330
 331         priv->tx_currdescnum = desc_num;
 332
 333         /* Start the transmission */
 334         writel(POLL_DATA, &dma_p->txpolldemand);
 335
 336         return 0;
 337 }
 338
 339 static int dw_eth_recv(struct eth_device *dev)
 340 {
 341         struct dw_eth_dev *priv = dev->priv;
 342         u32 status, desc_num = priv->rx_currdescnum;
 343         struct dmamacdescr *desc_p = &priv->rx_mac_descrtable[desc_num];
 344         int length = 0;
 345
 346         /* Invalidate entire buffer descriptor */
 347         invalidate_dcache_range((unsigned long)desc_p,
 348                                 (unsigned long)desc_p +
 349                                 sizeof(struct dmamacdescr));
 350
 351         status = desc_p->txrx_status;
 352
 353         /* Check  if the owner is the CPU */
 354         if (!(status & DESC_RXSTS_OWNBYDMA)) {
 355
 356                 length = (status & DESC_RXSTS_FRMLENMSK) >> \
 357                          DESC_RXSTS_FRMLENSHFT;
 358
 359                 /* Invalidate received data */
 360                 invalidate_dcache_range((unsigned long)desc_p->dmamac_addr,
 361                                         (unsigned long)desc_p->dmamac_addr +
 362                                         roundup(length, ARCH_DMA_MINALIGN));
 363
 364                 NetReceive(desc_p->dmamac_addr, length);
 365
 366                 /*
 367                  * Make the current descriptor valid again and go to
 368                  * the next one
 369                  */
 370                 desc_p->txrx_status |= DESC_RXSTS_OWNBYDMA;
 371
 372                 /* Flush only status field - others weren't changed */
 373                 flush_dcache_range((unsigned long)&desc_p->txrx_status,
 374                                    (unsigned long)&desc_p->txrx_status +
 375                                    sizeof(desc_p->txrx_status));
 376
 377                 /* Test the wrap-around condition. */
 378                 if (++desc_num >= CONFIG_RX_DESCR_NUM)
 379                         desc_num = 0;
 380         }
 381
 382         priv->rx_currdescnum = desc_num;
 383
 384         return length;
 385 }
 386
 387 static int dw_phy_init(struct eth_device *dev)
 388 {
 389         struct dw_eth_dev *priv = dev->priv;
 390         struct phy_device *phydev;
 391         int mask = 0xffffffff;
 392
 393 #ifdef CONFIG_PHY_ADDR
 394         mask = 1 << CONFIG_PHY_ADDR;
 395 #endif
 396
 397         phydev = phy_find_by_mask(priv->bus, mask, priv->interface);
 398         if (!phydev)
 399                 return -1;
 400
 401         phy_connect_dev(phydev, dev);
 402
 403         phydev->supported &= PHY_GBIT_FEATURES;
 404         phydev->advertising = phydev->supported;
 405
 406         priv->phydev = phydev;
 407         phy_config(phydev);
 408
 409         return 1;
 410 }
 411
 412 int designware_initialize(ulong base_addr, u32 interface)
 413 {
 414         struct eth_device *dev;
 415         struct dw_eth_dev *priv;
 416
 417         dev = (struct eth_device *) malloc(sizeof(struct eth_device));
 418         if (!dev)
 419                 return -ENOMEM;
 420
 421         /*
 422          * Since the priv structure contains the descriptors which need a strict
 423          * buswidth alignment, memalign is used to allocate memory
 424          */
 425         priv = (struct dw_eth_dev *) memalign(ARCH_DMA_MINALIGN,
 426                                               sizeof(struct dw_eth_dev));
 427         if (!priv) {
 428                 free(dev);
 429                 return -ENOMEM;
 430         }
 431
 432         memset(dev, 0, sizeof(struct eth_device));
 433         memset(priv, 0, sizeof(struct dw_eth_dev));
 434
 435         sprintf(dev->name, "dwmac.%lx", base_addr);
 436         dev->iobase = (int)base_addr;
 437         dev->priv = priv;
 438
 439         priv->dev = dev;
 440         priv->mac_regs_p = (struct eth_mac_regs *)base_addr;
 441         priv->dma_regs_p = (struct eth_dma_regs *)(base_addr +
 442                         DW_DMA_BASE_OFFSET);
 443
 444         dev->init = dw_eth_init;
 445         dev->send = dw_eth_send;
 446         dev->recv = dw_eth_recv;
 447         dev->halt = dw_eth_halt;
 448         dev->write_hwaddr = dw_write_hwaddr;
 449
 450         eth_register(dev);
 451
 452         priv->interface = interface;
 453
 454         dw_mdio_init(dev->name, priv->mac_regs_p);
 455         priv->bus = miiphy_get_dev_by_name(dev->name);
 456
 457         return dw_phy_init(dev);
 458 }