drivers/net/pch_gbe.c

   1 /*
   2  * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
   3  *
   4  * Intel Platform Controller Hub EG20T (codename Topcliff) GMAC Driver
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <dm.h>
  11 #include <errno.h>
  12 #include <asm/io.h>
  13 #include <pci.h>
  14 #include <miiphy.h>
  15 #include "pch_gbe.h"
  16
  17 #if !defined(CONFIG_PHYLIB)
  18 # error "PCH Gigabit Ethernet driver requires PHYLIB - missing CONFIG_PHYLIB"
  19 #endif
  20
  21 static struct pci_device_id supported[] = {
  22         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_TCF_GBE) },
  23         { }
  24 };
  25
  26 static void pch_gbe_mac_read(struct pch_gbe_regs *mac_regs, u8 *addr)
  27 {
  28         u32 macid_hi, macid_lo;
  29
  30         macid_hi = readl(&mac_regs->mac_adr[0].high);
  31         macid_lo = readl(&mac_regs->mac_adr[0].low) & 0xffff;
  32         debug("pch_gbe: macid_hi %#x macid_lo %#x\n", macid_hi, macid_lo);
  33
  34         addr[0] = (u8)(macid_hi & 0xff);
  35         addr[1] = (u8)((macid_hi >> 8) & 0xff);
  36         addr[2] = (u8)((macid_hi >> 16) & 0xff);
  37         addr[3] = (u8)((macid_hi >> 24) & 0xff);
  38         addr[4] = (u8)(macid_lo & 0xff);
  39         addr[5] = (u8)((macid_lo >> 8) & 0xff);
  40 }
  41
  42 static int pch_gbe_mac_write(struct pch_gbe_regs *mac_regs, u8 *addr)
  43 {
  44         u32 macid_hi, macid_lo;
  45         ulong start;
  46
  47         macid_hi = addr[0] + (addr[1] << 8) + (addr[2] << 16) + (addr[3] << 24);
  48         macid_lo = addr[4] + (addr[5] << 8);
  49
  50         writel(macid_hi, &mac_regs->mac_adr[0].high);
  51         writel(macid_lo, &mac_regs->mac_adr[0].low);
  52         writel(0xfffe, &mac_regs->addr_mask);
  53
  54         start = get_timer(0);
  55         while (get_timer(start) < PCH_GBE_TIMEOUT) {
  56                 if (!(readl(&mac_regs->addr_mask) & PCH_GBE_BUSY))
  57                         return 0;
  58
  59                 udelay(10);
  60         }
  61
  62         return -ETIME;
  63 }
  64
  65 static int pch_gbe_reset(struct udevice *dev)
  66 {
  67         struct pch_gbe_priv *priv = dev_get_priv(dev);
  68         struct eth_pdata *plat = dev_get_platdata(dev);
  69         struct pch_gbe_regs *mac_regs = priv->mac_regs;
  70         ulong start;
  71
  72         priv->rx_idx = 0;
  73         priv->tx_idx = 0;
  74
  75         writel(PCH_GBE_ALL_RST, &mac_regs->reset);
  76
  77         /*
  78          * Configure the MAC to RGMII mode after reset
  79          *
  80          * For some unknown reason, we must do the configuration here right
  81          * after resetting the whole MAC, otherwise the reset bit in the RESET
  82          * register will never be cleared by the hardware. And there is another
  83          * way of having the same magic, that is to configure the MODE register
  84          * to have the MAC work in MII/GMII mode, which is how current Linux
  85          * pch_gbe driver does. Since anyway we need program the MAC to RGMII
  86          * mode in the driver, we just do it here.
  87          *
  88          * Note: this behavior is not documented in the hardware manual.
  89          */
  90         writel(PCH_GBE_RGMII_MODE_RGMII | PCH_GBE_CHIP_TYPE_INTERNAL,
  91                &mac_regs->rgmii_ctrl);
  92
  93         start = get_timer(0);
  94         while (get_timer(start) < PCH_GBE_TIMEOUT) {
  95                 if (!(readl(&mac_regs->reset) & PCH_GBE_ALL_RST)) {
  96                         /*
  97                          * Soft reset clears hardware MAC address registers,
  98                          * so we have to reload MAC address here in order to
  99                          * make linux pch_gbe driver happy.
 100                          */
 101                         return pch_gbe_mac_write(mac_regs, plat->enetaddr);
 102                 }
 103
 104                 udelay(10);
 105         }
 106
 107         debug("pch_gbe: reset timeout\n");
 108         return -ETIME;
 109 }
 110
 111 static void pch_gbe_rx_descs_init(struct udevice *dev)
 112 {
 113         struct pch_gbe_priv *priv = dev_get_priv(dev);
 114         struct pch_gbe_regs *mac_regs = priv->mac_regs;
 115         struct pch_gbe_rx_desc *rx_desc = &priv->rx_desc[0];
 116         int i;
 117
 118         memset(rx_desc, 0, sizeof(struct pch_gbe_rx_desc) * PCH_GBE_DESC_NUM);
 119         for (i = 0; i < PCH_GBE_DESC_NUM; i++)
 120                 rx_desc[i].buffer_addr = dm_pci_virt_to_mem(priv->dev,
 121                         priv->rx_buff[i]);
 122
 123         flush_dcache_range((ulong)rx_desc, (ulong)&rx_desc[PCH_GBE_DESC_NUM]);
 124
 125         writel(dm_pci_virt_to_mem(priv->dev, rx_desc),
 126                &mac_regs->rx_dsc_base);
 127         writel(sizeof(struct pch_gbe_rx_desc) * (PCH_GBE_DESC_NUM - 1),
 128                &mac_regs->rx_dsc_size);
 129
 130         writel(dm_pci_virt_to_mem(priv->dev, rx_desc + 1),
 131                &mac_regs->rx_dsc_sw_p);
 132 }
 133
 134 static void pch_gbe_tx_descs_init(struct udevice *dev)
 135 {
 136         struct pch_gbe_priv *priv = dev_get_priv(dev);
 137         struct pch_gbe_regs *mac_regs = priv->mac_regs;
 138         struct pch_gbe_tx_desc *tx_desc = &priv->tx_desc[0];
 139
 140         memset(tx_desc, 0, sizeof(struct pch_gbe_tx_desc) * PCH_GBE_DESC_NUM);
 141
 142         flush_dcache_range((ulong)tx_desc, (ulong)&tx_desc[PCH_GBE_DESC_NUM]);
 143
 144         writel(dm_pci_virt_to_mem(priv->dev, tx_desc),
 145                &mac_regs->tx_dsc_base);
 146         writel(sizeof(struct pch_gbe_tx_desc) * (PCH_GBE_DESC_NUM - 1),
 147                &mac_regs->tx_dsc_size);
 148         writel(dm_pci_virt_to_mem(priv->dev, tx_desc + 1),
 149                &mac_regs->tx_dsc_sw_p);
 150 }
 151
 152 static void pch_gbe_adjust_link(struct pch_gbe_regs *mac_regs,
 153                                 struct phy_device *phydev)
 154 {
 155         if (!phydev->link) {
 156                 printf("%s: No link.\n", phydev->dev->name);
 157                 return;
 158         }
 159
 160         clrbits_le32(&mac_regs->rgmii_ctrl,
 161                      PCH_GBE_RGMII_RATE_2_5M | PCH_GBE_CRS_SEL);
 162         clrbits_le32(&mac_regs->mode,
 163                      PCH_GBE_MODE_GMII_ETHER | PCH_GBE_MODE_FULL_DUPLEX);
 164
 165         switch (phydev->speed) {
 166         case 1000:
 167                 setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_125M);
 168                 setbits_le32(&mac_regs->mode, PCH_GBE_MODE_GMII_ETHER);
 169                 break;
 170         case 100:
 171                 setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_25M);
 172                 setbits_le32(&mac_regs->mode, PCH_GBE_MODE_MII_ETHER);
 173                 break;
 174         case 10:
 175                 setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_2_5M);
 176                 setbits_le32(&mac_regs->mode, PCH_GBE_MODE_MII_ETHER);
 177                 break;
 178         }
 179
 180         if (phydev->duplex) {
 181                 setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_CRS_SEL);
 182                 setbits_le32(&mac_regs->mode, PCH_GBE_MODE_FULL_DUPLEX);
 183         }
 184
 185         printf("Speed: %d, %s duplex\n", phydev->speed,
 186                (phydev->duplex) ? "full" : "half");
 187
 188         return;
 189 }
 190
 191 static int pch_gbe_start(struct udevice *dev)
 192 {
 193         struct pch_gbe_priv *priv = dev_get_priv(dev);
 194         struct pch_gbe_regs *mac_regs = priv->mac_regs;
 195
 196         if (pch_gbe_reset(dev))
 197                 return -1;
 198
 199         pch_gbe_rx_descs_init(dev);
 200         pch_gbe_tx_descs_init(dev);
 201
 202         /* Enable frame bursting */
 203         writel(PCH_GBE_MODE_FR_BST, &mac_regs->mode);
 204         /* Disable TCP/IP accelerator */
 205         writel(PCH_GBE_RX_TCPIPACC_OFF, &mac_regs->tcpip_acc);
 206         /* Disable RX flow control */
 207         writel(0, &mac_regs->rx_fctrl);
 208         /* Configure RX/TX mode */
 209         writel(PCH_GBE_RH_ALM_EMP_16 | PCH_GBE_RH_ALM_FULL_16 |
 210                PCH_GBE_RH_RD_TRG_32, &mac_regs->rx_mode);
 211         writel(PCH_GBE_TM_TH_TX_STRT_32 | PCH_GBE_TM_TH_ALM_EMP_16 |
 212                PCH_GBE_TM_TH_ALM_FULL_32 | PCH_GBE_TM_ST_AND_FD |
 213                PCH_GBE_TM_SHORT_PKT, &mac_regs->tx_mode);
 214
 215         /* Start up the PHY */
 216         if (phy_startup(priv->phydev)) {
 217                 printf("Could not initialize PHY %s\n",
 218                        priv->phydev->dev->name);
 219                 return -1;
 220         }
 221
 222         pch_gbe_adjust_link(mac_regs, priv->phydev);
 223
 224         if (!priv->phydev->link)
 225                 return -1;
 226
 227         /* Enable TX & RX */
 228         writel(PCH_GBE_RX_DMA_EN | PCH_GBE_TX_DMA_EN, &mac_regs->dma_ctrl);
 229         writel(PCH_GBE_MRE_MAC_RX_EN, &mac_regs->mac_rx_en);
 230
 231         return 0;
 232 }
 233
 234 static void pch_gbe_stop(struct udevice *dev)
 235 {
 236         struct pch_gbe_priv *priv = dev_get_priv(dev);
 237
 238         pch_gbe_reset(dev);
 239
 240         phy_shutdown(priv->phydev);
 241 }
 242
 243 static int pch_gbe_send(struct udevice *dev, void *packet, int length)
 244 {
 245         struct pch_gbe_priv *priv = dev_get_priv(dev);
 246         struct pch_gbe_regs *mac_regs = priv->mac_regs;
 247         struct pch_gbe_tx_desc *tx_head, *tx_desc;
 248         u16 frame_ctrl = 0;
 249         u32 int_st;
 250         ulong start;
 251
 252         flush_dcache_range((ulong)packet, (ulong)packet + length);
 253
 254         tx_head = &priv->tx_desc[0];
 255         tx_desc = &priv->tx_desc[priv->tx_idx];
 256
 257         if (length < 64)
 258                 frame_ctrl |= PCH_GBE_TXD_CTRL_APAD;
 259
 260         tx_desc->buffer_addr = dm_pci_virt_to_mem(priv->dev, packet);
 261         tx_desc->length = length;
 262         tx_desc->tx_words_eob = length + 3;
 263         tx_desc->tx_frame_ctrl = frame_ctrl;
 264         tx_desc->dma_status = 0;
 265         tx_desc->gbec_status = 0;
 266
 267         flush_dcache_range((ulong)tx_desc, (ulong)&tx_desc[1]);
 268
 269         /* Test the wrap-around condition */
 270         if (++priv->tx_idx >= PCH_GBE_DESC_NUM)
 271                 priv->tx_idx = 0;
 272
 273         writel(dm_pci_virt_to_mem(priv->dev, tx_head + priv->tx_idx),
 274                &mac_regs->tx_dsc_sw_p);
 275
 276         start = get_timer(0);
 277         while (get_timer(start) < PCH_GBE_TIMEOUT) {
 278                 int_st = readl(&mac_regs->int_st);
 279                 if (int_st & PCH_GBE_INT_TX_CMPLT)
 280                         return 0;
 281
 282                 udelay(10);
 283         }
 284
 285         debug("pch_gbe: sent failed\n");
 286         return -ETIME;
 287 }
 288
 289 static int pch_gbe_recv(struct udevice *dev, int flags, uchar **packetp)
 290 {
 291         struct pch_gbe_priv *priv = dev_get_priv(dev);
 292         struct pch_gbe_regs *mac_regs = priv->mac_regs;
 293         struct pch_gbe_rx_desc *rx_desc;
 294         ulong hw_desc, length;
 295         void *buffer;
 296
 297         rx_desc = &priv->rx_desc[priv->rx_idx];
 298
 299         readl(&mac_regs->int_st);
 300         hw_desc = readl(&mac_regs->rx_dsc_hw_p_hld);
 301
 302         /* Just return if not receiving any packet */
 303         if (virt_to_phys(rx_desc) == hw_desc)
 304                 return -EAGAIN;
 305
 306         /* Invalidate the descriptor */
 307         invalidate_dcache_range((ulong)rx_desc, (ulong)&rx_desc[1]);
 308
 309         length = rx_desc->rx_words_eob - 3 - ETH_FCS_LEN;
 310         buffer = dm_pci_mem_to_virt(priv->dev, rx_desc->buffer_addr, length, 0);
 311         invalidate_dcache_range((ulong)buffer, (ulong)buffer + length);
 312         *packetp = (uchar *)buffer;
 313
 314         return length;
 315 }
 316
 317 static int pch_gbe_free_pkt(struct udevice *dev, uchar *packet, int length)
 318 {
 319         struct pch_gbe_priv *priv = dev_get_priv(dev);
 320         struct pch_gbe_regs *mac_regs = priv->mac_regs;
 321         struct pch_gbe_rx_desc *rx_head = &priv->rx_desc[0];
 322         int rx_swp;
 323
 324         /* Test the wrap-around condition */
 325         if (++priv->rx_idx >= PCH_GBE_DESC_NUM)
 326                 priv->rx_idx = 0;
 327         rx_swp = priv->rx_idx;
 328         if (++rx_swp >= PCH_GBE_DESC_NUM)
 329                 rx_swp = 0;
 330
 331         writel(dm_pci_virt_to_mem(priv->dev, rx_head + rx_swp),
 332                &mac_regs->rx_dsc_sw_p);
 333
 334         return 0;
 335 }
 336
 337 static int pch_gbe_mdio_ready(struct pch_gbe_regs *mac_regs)
 338 {
 339         ulong start = get_timer(0);
 340
 341         while (get_timer(start) < PCH_GBE_TIMEOUT) {
 342                 if (readl(&mac_regs->miim) & PCH_GBE_MIIM_OPER_READY)
 343                         return 0;
 344
 345                 udelay(10);
 346         }
 347
 348         return -ETIME;
 349 }
 350
 351 static int pch_gbe_mdio_read(struct mii_dev *bus, int addr, int devad, int reg)
 352 {
 353         struct pch_gbe_regs *mac_regs = bus->priv;
 354         u32 miim;
 355
 356         if (pch_gbe_mdio_ready(mac_regs))
 357                 return -ETIME;
 358
 359         miim = (addr << PCH_GBE_MIIM_PHY_ADDR_SHIFT) |
 360                (reg << PCH_GBE_MIIM_REG_ADDR_SHIFT) |
 361                PCH_GBE_MIIM_OPER_READ;
 362         writel(miim, &mac_regs->miim);
 363
 364         if (pch_gbe_mdio_ready(mac_regs))
 365                 return -ETIME;
 366
 367         return readl(&mac_regs->miim) & 0xffff;
 368 }
 369
 370 static int pch_gbe_mdio_write(struct mii_dev *bus, int addr, int devad,
 371                               int reg, u16 val)
 372 {
 373         struct pch_gbe_regs *mac_regs = bus->priv;
 374         u32 miim;
 375
 376         if (pch_gbe_mdio_ready(mac_regs))
 377                 return -ETIME;
 378
 379         miim = (addr << PCH_GBE_MIIM_PHY_ADDR_SHIFT) |
 380                (reg << PCH_GBE_MIIM_REG_ADDR_SHIFT) |
 381                PCH_GBE_MIIM_OPER_WRITE | val;
 382         writel(miim, &mac_regs->miim);
 383
 384         if (pch_gbe_mdio_ready(mac_regs))
 385                 return -ETIME;
 386         else
 387                 return 0;
 388 }
 389
 390 static int pch_gbe_mdio_init(const char *name, struct pch_gbe_regs *mac_regs)
 391 {
 392         struct mii_dev *bus;
 393
 394         bus = mdio_alloc();
 395         if (!bus) {
 396                 debug("pch_gbe: failed to allocate MDIO bus\n");
 397                 return -ENOMEM;
 398         }
 399
 400         bus->read = pch_gbe_mdio_read;
 401         bus->write = pch_gbe_mdio_write;
 402         strcpy(bus->name, name);
 403
 404         bus->priv = (void *)mac_regs;
 405
 406         return mdio_register(bus);
 407 }
 408
 409 static int pch_gbe_phy_init(struct udevice *dev)
 410 {
 411         struct pch_gbe_priv *priv = dev_get_priv(dev);
 412         struct eth_pdata *plat = dev_get_platdata(dev);
 413         struct phy_device *phydev;
 414         int mask = 0xffffffff;
 415
 416         phydev = phy_find_by_mask(priv->bus, mask, plat->phy_interface);
 417         if (!phydev) {
 418                 printf("pch_gbe: cannot find the phy\n");
 419                 return -1;
 420         }
 421
 422         phy_connect_dev(phydev, dev);
 423
 424         phydev->supported &= PHY_GBIT_FEATURES;
 425         phydev->advertising = phydev->supported;
 426
 427         priv->phydev = phydev;
 428         phy_config(phydev);
 429
 430         return 0;
 431 }
 432
 433 int pch_gbe_probe(struct udevice *dev)
 434 {
 435         struct pch_gbe_priv *priv;
 436         struct eth_pdata *plat = dev_get_platdata(dev);
 437         void *iobase;
 438         int err;
 439
 440         /*
 441          * The priv structure contains the descriptors and frame buffers which
 442          * need a strict buswidth alignment (64 bytes). This is guaranteed by
 443          * DM_FLAG_ALLOC_PRIV_DMA flag in the U_BOOT_DRIVER.
 444          */
 445         priv = dev_get_priv(dev);
 446
 447         priv->dev = dev;
 448
 449         iobase = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_1, PCI_REGION_MEM);
 450
 451         plat->iobase = (ulong)iobase;
 452         priv->mac_regs = (struct pch_gbe_regs *)iobase;
 453
 454         /* Read MAC address from SROM and initialize dev->enetaddr with it */
 455         pch_gbe_mac_read(priv->mac_regs, plat->enetaddr);
 456
 457         plat->phy_interface = PHY_INTERFACE_MODE_RGMII;
 458         pch_gbe_mdio_init(dev->name, priv->mac_regs);
 459         priv->bus = miiphy_get_dev_by_name(dev->name);
 460
 461         err = pch_gbe_reset(dev);
 462         if (err)
 463                 return err;
 464
 465         return pch_gbe_phy_init(dev);
 466 }
 467
 468 int pch_gbe_remove(struct udevice *dev)
 469 {
 470         struct pch_gbe_priv *priv = dev_get_priv(dev);
 471
 472         free(priv->phydev);
 473         mdio_unregister(priv->bus);
 474         mdio_free(priv->bus);
 475
 476         return 0;
 477 }
 478
 479 static const struct eth_ops pch_gbe_ops = {
 480         .start = pch_gbe_start,
 481         .send = pch_gbe_send,
 482         .recv = pch_gbe_recv,
 483         .free_pkt = pch_gbe_free_pkt,
 484         .stop = pch_gbe_stop,
 485 };
 486
 487 static const struct udevice_id pch_gbe_ids[] = {
 488         { .compatible = "intel,pch-gbe" },
 489         { }
 490 };
 491
 492 U_BOOT_DRIVER(eth_pch_gbe) = {
 493         .name = "pch_gbe",
 494         .id = UCLASS_ETH,
 495         .of_match = pch_gbe_ids,
 496         .probe = pch_gbe_probe,
 497         .remove = pch_gbe_remove,
 498         .ops = &pch_gbe_ops,
 499         .priv_auto_alloc_size = sizeof(struct pch_gbe_priv),
 500         .platdata_auto_alloc_size = sizeof(struct eth_pdata),
 501         .flags = DM_FLAG_ALLOC_PRIV_DMA,
 502 };
 503
 504 U_BOOT_PCI_DEVICE(eth_pch_gbe, supported);