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->buffer_addr = dm_pci_phys_to_mem(priv->dev, 121 (ulong)(priv->rx_buff[i])); 122 123 writel(dm_pci_phys_to_mem(priv->dev, (ulong)rx_desc), 124 &mac_regs->rx_dsc_base); 125 writel(sizeof(struct pch_gbe_rx_desc) * (PCH_GBE_DESC_NUM - 1), 126 &mac_regs->rx_dsc_size); 127 128 writel(dm_pci_phys_to_mem(priv->dev, (ulong)(rx_desc + 1)), 129 &mac_regs->rx_dsc_sw_p); 130 } 131 132 static void pch_gbe_tx_descs_init(struct udevice *dev) 133 { 134 struct pch_gbe_priv *priv = dev_get_priv(dev); 135 struct pch_gbe_regs *mac_regs = priv->mac_regs; 136 struct pch_gbe_tx_desc *tx_desc = &priv->tx_desc[0]; 137 138 memset(tx_desc, 0, sizeof(struct pch_gbe_tx_desc) * PCH_GBE_DESC_NUM); 139 140 writel(dm_pci_phys_to_mem(priv->dev, (ulong)tx_desc), 141 &mac_regs->tx_dsc_base); 142 writel(sizeof(struct pch_gbe_tx_desc) * (PCH_GBE_DESC_NUM - 1), 143 &mac_regs->tx_dsc_size); 144 writel(dm_pci_phys_to_mem(priv->dev, (ulong)(tx_desc + 1)), 145 &mac_regs->tx_dsc_sw_p); 146 } 147 148 static void pch_gbe_adjust_link(struct pch_gbe_regs *mac_regs, 149 struct phy_device *phydev) 150 { 151 if (!phydev->link) { 152 printf("%s: No link.\n", phydev->dev->name); 153 return; 154 } 155 156 clrbits_le32(&mac_regs->rgmii_ctrl, 157 PCH_GBE_RGMII_RATE_2_5M | PCH_GBE_CRS_SEL); 158 clrbits_le32(&mac_regs->mode, 159 PCH_GBE_MODE_GMII_ETHER | PCH_GBE_MODE_FULL_DUPLEX); 160 161 switch (phydev->speed) { 162 case 1000: 163 setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_125M); 164 setbits_le32(&mac_regs->mode, PCH_GBE_MODE_GMII_ETHER); 165 break; 166 case 100: 167 setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_25M); 168 setbits_le32(&mac_regs->mode, PCH_GBE_MODE_MII_ETHER); 169 break; 170 case 10: 171 setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_RGMII_RATE_2_5M); 172 setbits_le32(&mac_regs->mode, PCH_GBE_MODE_MII_ETHER); 173 break; 174 } 175 176 if (phydev->duplex) { 177 setbits_le32(&mac_regs->rgmii_ctrl, PCH_GBE_CRS_SEL); 178 setbits_le32(&mac_regs->mode, PCH_GBE_MODE_FULL_DUPLEX); 179 } 180 181 printf("Speed: %d, %s duplex\n", phydev->speed, 182 (phydev->duplex) ? "full" : "half"); 183 184 return; 185 } 186 187 static int pch_gbe_start(struct udevice *dev) 188 { 189 struct pch_gbe_priv *priv = dev_get_priv(dev); 190 struct pch_gbe_regs *mac_regs = priv->mac_regs; 191 192 if (pch_gbe_reset(dev)) 193 return -1; 194 195 pch_gbe_rx_descs_init(dev); 196 pch_gbe_tx_descs_init(dev); 197 198 /* Enable frame bursting */ 199 writel(PCH_GBE_MODE_FR_BST, &mac_regs->mode); 200 /* Disable TCP/IP accelerator */ 201 writel(PCH_GBE_RX_TCPIPACC_OFF, &mac_regs->tcpip_acc); 202 /* Disable RX flow control */ 203 writel(0, &mac_regs->rx_fctrl); 204 /* Configure RX/TX mode */ 205 writel(PCH_GBE_RH_ALM_EMP_16 | PCH_GBE_RH_ALM_FULL_16 | 206 PCH_GBE_RH_RD_TRG_32, &mac_regs->rx_mode); 207 writel(PCH_GBE_TM_TH_TX_STRT_32 | PCH_GBE_TM_TH_ALM_EMP_16 | 208 PCH_GBE_TM_TH_ALM_FULL_32 | PCH_GBE_TM_ST_AND_FD | 209 PCH_GBE_TM_SHORT_PKT, &mac_regs->tx_mode); 210 211 /* Start up the PHY */ 212 if (phy_startup(priv->phydev)) { 213 printf("Could not initialize PHY %s\n", 214 priv->phydev->dev->name); 215 return -1; 216 } 217 218 pch_gbe_adjust_link(mac_regs, priv->phydev); 219 220 if (!priv->phydev->link) 221 return -1; 222 223 /* Enable TX & RX */ 224 writel(PCH_GBE_RX_DMA_EN | PCH_GBE_TX_DMA_EN, &mac_regs->dma_ctrl); 225 writel(PCH_GBE_MRE_MAC_RX_EN, &mac_regs->mac_rx_en); 226 227 return 0; 228 } 229 230 static void pch_gbe_stop(struct udevice *dev) 231 { 232 struct pch_gbe_priv *priv = dev_get_priv(dev); 233 234 pch_gbe_reset(dev); 235 236 phy_shutdown(priv->phydev); 237 } 238 239 static int pch_gbe_send(struct udevice *dev, void *packet, int length) 240 { 241 struct pch_gbe_priv *priv = dev_get_priv(dev); 242 struct pch_gbe_regs *mac_regs = priv->mac_regs; 243 struct pch_gbe_tx_desc *tx_head, *tx_desc; 244 u16 frame_ctrl = 0; 245 u32 int_st; 246 ulong start; 247 248 tx_head = &priv->tx_desc[0]; 249 tx_desc = &priv->tx_desc[priv->tx_idx]; 250 251 if (length < 64) 252 frame_ctrl |= PCH_GBE_TXD_CTRL_APAD; 253 254 tx_desc->buffer_addr = dm_pci_phys_to_mem(priv->dev, (ulong)packet); 255 tx_desc->length = length; 256 tx_desc->tx_words_eob = length + 3; 257 tx_desc->tx_frame_ctrl = frame_ctrl; 258 tx_desc->dma_status = 0; 259 tx_desc->gbec_status = 0; 260 261 /* Test the wrap-around condition */ 262 if (++priv->tx_idx >= PCH_GBE_DESC_NUM) 263 priv->tx_idx = 0; 264 265 writel(dm_pci_phys_to_mem(priv->dev, (ulong)(tx_head + priv->tx_idx)), 266 &mac_regs->tx_dsc_sw_p); 267 268 start = get_timer(0); 269 while (get_timer(start) < PCH_GBE_TIMEOUT) { 270 int_st = readl(&mac_regs->int_st); 271 if (int_st & PCH_GBE_INT_TX_CMPLT) 272 return 0; 273 274 udelay(10); 275 } 276 277 debug("pch_gbe: sent failed\n"); 278 return -ETIME; 279 } 280 281 static int pch_gbe_recv(struct udevice *dev, int flags, uchar **packetp) 282 { 283 struct pch_gbe_priv *priv = dev_get_priv(dev); 284 struct pch_gbe_regs *mac_regs = priv->mac_regs; 285 struct pch_gbe_rx_desc *rx_desc; 286 ulong hw_desc, buffer_addr, length; 287 288 rx_desc = &priv->rx_desc[priv->rx_idx]; 289 290 readl(&mac_regs->int_st); 291 hw_desc = readl(&mac_regs->rx_dsc_hw_p_hld); 292 293 /* Just return if not receiving any packet */ 294 if ((ulong)rx_desc == hw_desc) 295 return -EAGAIN; 296 297 buffer_addr = dm_pci_mem_to_phys(priv->dev, rx_desc->buffer_addr); 298 *packetp = (uchar *)buffer_addr; 299 length = rx_desc->rx_words_eob - 3 - ETH_FCS_LEN; 300 301 return length; 302 } 303 304 static int pch_gbe_free_pkt(struct udevice *dev, uchar *packet, int length) 305 { 306 struct pch_gbe_priv *priv = dev_get_priv(dev); 307 struct pch_gbe_regs *mac_regs = priv->mac_regs; 308 struct pch_gbe_rx_desc *rx_head = &priv->rx_desc[0]; 309 int rx_swp; 310 311 /* Test the wrap-around condition */ 312 if (++priv->rx_idx >= PCH_GBE_DESC_NUM) 313 priv->rx_idx = 0; 314 rx_swp = priv->rx_idx; 315 if (++rx_swp >= PCH_GBE_DESC_NUM) 316 rx_swp = 0; 317 318 writel(dm_pci_phys_to_mem(priv->dev, (ulong)(rx_head + rx_swp)), 319 &mac_regs->rx_dsc_sw_p); 320 321 return 0; 322 } 323 324 static int pch_gbe_mdio_ready(struct pch_gbe_regs *mac_regs) 325 { 326 ulong start = get_timer(0); 327 328 while (get_timer(start) < PCH_GBE_TIMEOUT) { 329 if (readl(&mac_regs->miim) & PCH_GBE_MIIM_OPER_READY) 330 return 0; 331 332 udelay(10); 333 } 334 335 return -ETIME; 336 } 337 338 static int pch_gbe_mdio_read(struct mii_dev *bus, int addr, int devad, int reg) 339 { 340 struct pch_gbe_regs *mac_regs = bus->priv; 341 u32 miim; 342 343 if (pch_gbe_mdio_ready(mac_regs)) 344 return -ETIME; 345 346 miim = (addr << PCH_GBE_MIIM_PHY_ADDR_SHIFT) | 347 (reg << PCH_GBE_MIIM_REG_ADDR_SHIFT) | 348 PCH_GBE_MIIM_OPER_READ; 349 writel(miim, &mac_regs->miim); 350 351 if (pch_gbe_mdio_ready(mac_regs)) 352 return -ETIME; 353 354 return readl(&mac_regs->miim) & 0xffff; 355 } 356 357 static int pch_gbe_mdio_write(struct mii_dev *bus, int addr, int devad, 358 int reg, u16 val) 359 { 360 struct pch_gbe_regs *mac_regs = bus->priv; 361 u32 miim; 362 363 if (pch_gbe_mdio_ready(mac_regs)) 364 return -ETIME; 365 366 miim = (addr << PCH_GBE_MIIM_PHY_ADDR_SHIFT) | 367 (reg << PCH_GBE_MIIM_REG_ADDR_SHIFT) | 368 PCH_GBE_MIIM_OPER_WRITE | val; 369 writel(miim, &mac_regs->miim); 370 371 if (pch_gbe_mdio_ready(mac_regs)) 372 return -ETIME; 373 else 374 return 0; 375 } 376 377 static int pch_gbe_mdio_init(const char *name, struct pch_gbe_regs *mac_regs) 378 { 379 struct mii_dev *bus; 380 381 bus = mdio_alloc(); 382 if (!bus) { 383 debug("pch_gbe: failed to allocate MDIO bus\n"); 384 return -ENOMEM; 385 } 386 387 bus->read = pch_gbe_mdio_read; 388 bus->write = pch_gbe_mdio_write; 389 strcpy(bus->name, name); 390 391 bus->priv = (void *)mac_regs; 392 393 return mdio_register(bus); 394 } 395 396 static int pch_gbe_phy_init(struct udevice *dev) 397 { 398 struct pch_gbe_priv *priv = dev_get_priv(dev); 399 struct eth_pdata *plat = dev_get_platdata(dev); 400 struct phy_device *phydev; 401 int mask = 0xffffffff; 402 403 phydev = phy_find_by_mask(priv->bus, mask, plat->phy_interface); 404 if (!phydev) { 405 printf("pch_gbe: cannot find the phy\n"); 406 return -1; 407 } 408 409 phy_connect_dev(phydev, dev); 410 411 phydev->supported &= PHY_GBIT_FEATURES; 412 phydev->advertising = phydev->supported; 413 414 priv->phydev = phydev; 415 phy_config(phydev); 416 417 return 0; 418 } 419 420 int pch_gbe_probe(struct udevice *dev) 421 { 422 struct pch_gbe_priv *priv; 423 struct eth_pdata *plat = dev_get_platdata(dev); 424 void *iobase; 425 426 /* 427 * The priv structure contains the descriptors and frame buffers which 428 * need a strict buswidth alignment (64 bytes). This is guaranteed by 429 * DM_FLAG_ALLOC_PRIV_DMA flag in the U_BOOT_DRIVER. 430 */ 431 priv = dev_get_priv(dev); 432 433 priv->dev = dev; 434 435 iobase = dm_pci_map_bar(dev, PCI_BASE_ADDRESS_1, PCI_REGION_MEM); 436 437 plat->iobase = (ulong)iobase; 438 priv->mac_regs = (struct pch_gbe_regs *)iobase; 439 440 /* Read MAC address from SROM and initialize dev->enetaddr with it */ 441 pch_gbe_mac_read(priv->mac_regs, plat->enetaddr); 442 443 plat->phy_interface = PHY_INTERFACE_MODE_RGMII; 444 pch_gbe_mdio_init(dev->name, priv->mac_regs); 445 priv->bus = miiphy_get_dev_by_name(dev->name); 446 447 return pch_gbe_phy_init(dev); 448 } 449 450 int pch_gbe_remove(struct udevice *dev) 451 { 452 struct pch_gbe_priv *priv = dev_get_priv(dev); 453 454 free(priv->phydev); 455 mdio_unregister(priv->bus); 456 mdio_free(priv->bus); 457 458 return 0; 459 } 460 461 static const struct eth_ops pch_gbe_ops = { 462 .start = pch_gbe_start, 463 .send = pch_gbe_send, 464 .recv = pch_gbe_recv, 465 .free_pkt = pch_gbe_free_pkt, 466 .stop = pch_gbe_stop, 467 }; 468 469 static const struct udevice_id pch_gbe_ids[] = { 470 { .compatible = "intel,pch-gbe" }, 471 { } 472 }; 473 474 U_BOOT_DRIVER(eth_pch_gbe) = { 475 .name = "pch_gbe", 476 .id = UCLASS_ETH, 477 .of_match = pch_gbe_ids, 478 .probe = pch_gbe_probe, 479 .remove = pch_gbe_remove, 480 .ops = &pch_gbe_ops, 481 .priv_auto_alloc_size = sizeof(struct pch_gbe_priv), 482 .platdata_auto_alloc_size = sizeof(struct eth_pdata), 483 .flags = DM_FLAG_ALLOC_PRIV_DMA, 484 }; 485 486 U_BOOT_PCI_DEVICE(eth_pch_gbe, supported); 487