1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * PCIe host controller driver for Kirin Phone SoCs 4 * 5 * Copyright (C) 2017 HiSilicon Electronics Co., Ltd. 6 * https://www.huawei.com 7 * 8 * Author: Xiaowei Song <songxiaowei@huawei.com> 9 */ 10 11 #include <linux/clk.h> 12 #include <linux/compiler.h> 13 #include <linux/delay.h> 14 #include <linux/err.h> 15 #include <linux/gpio.h> 16 #include <linux/gpio/consumer.h> 17 #include <linux/interrupt.h> 18 #include <linux/mfd/syscon.h> 19 #include <linux/of.h> 20 #include <linux/of_gpio.h> 21 #include <linux/of_pci.h> 22 #include <linux/phy/phy.h> 23 #include <linux/pci.h> 24 #include <linux/pci_regs.h> 25 #include <linux/platform_device.h> 26 #include <linux/regmap.h> 27 #include <linux/resource.h> 28 #include <linux/types.h> 29 #include "pcie-designware.h" 30 31 #define to_kirin_pcie(x) dev_get_drvdata((x)->dev) 32 33 /* PCIe ELBI registers */ 34 #define SOC_PCIECTRL_CTRL0_ADDR 0x000 35 #define SOC_PCIECTRL_CTRL1_ADDR 0x004 36 #define PCIE_ELBI_SLV_DBI_ENABLE (0x1 << 21) 37 38 /* info located in APB */ 39 #define PCIE_APP_LTSSM_ENABLE 0x01c 40 #define PCIE_APB_PHY_STATUS0 0x400 41 #define PCIE_LINKUP_ENABLE (0x8020) 42 #define PCIE_LTSSM_ENABLE_BIT (0x1 << 11) 43 44 /* info located in sysctrl */ 45 #define SCTRL_PCIE_CMOS_OFFSET 0x60 46 #define SCTRL_PCIE_CMOS_BIT 0x10 47 #define SCTRL_PCIE_ISO_OFFSET 0x44 48 #define SCTRL_PCIE_ISO_BIT 0x30 49 #define SCTRL_PCIE_HPCLK_OFFSET 0x190 50 #define SCTRL_PCIE_HPCLK_BIT 0x184000 51 #define SCTRL_PCIE_OE_OFFSET 0x14a 52 #define PCIE_DEBOUNCE_PARAM 0xF0F400 53 #define PCIE_OE_BYPASS (0x3 << 28) 54 55 /* 56 * Max number of connected PCI slots at an external PCI bridge 57 * 58 * This is used on HiKey 970, which has a PEX 8606 bridge with 4 connected 59 * lanes (lane 0 upstream, and the other three lanes, one connected to an 60 * in-board Ethernet adapter and the other two connected to M.2 and mini 61 * PCI slots. 62 * 63 * Each slot has a different clock source and uses a separate PERST# pin. 64 */ 65 #define MAX_PCI_SLOTS 3 66 67 enum pcie_kirin_phy_type { 68 PCIE_KIRIN_INTERNAL_PHY, 69 PCIE_KIRIN_EXTERNAL_PHY 70 }; 71 72 struct kirin_pcie { 73 enum pcie_kirin_phy_type type; 74 75 struct dw_pcie *pci; 76 struct regmap *apb; 77 struct phy *phy; 78 void *phy_priv; /* only for PCIE_KIRIN_INTERNAL_PHY */ 79 80 /* DWC PERST# */ 81 int gpio_id_dwc_perst; 82 83 /* Per-slot PERST# */ 84 int num_slots; 85 int gpio_id_reset[MAX_PCI_SLOTS]; 86 const char *reset_names[MAX_PCI_SLOTS]; 87 88 /* Per-slot clkreq */ 89 int n_gpio_clkreq; 90 int gpio_id_clkreq[MAX_PCI_SLOTS]; 91 const char *clkreq_names[MAX_PCI_SLOTS]; 92 }; 93 94 /* 95 * Kirin 960 PHY. Can't be split into a PHY driver without changing the 96 * DT schema. 97 */ 98 99 #define REF_CLK_FREQ 100000000 100 101 /* PHY info located in APB */ 102 #define PCIE_APB_PHY_CTRL0 0x0 103 #define PCIE_APB_PHY_CTRL1 0x4 104 #define PCIE_APB_PHY_STATUS0 0x400 105 #define PIPE_CLK_STABLE BIT(19) 106 #define PHY_REF_PAD_BIT BIT(8) 107 #define PHY_PWR_DOWN_BIT BIT(22) 108 #define PHY_RST_ACK_BIT BIT(16) 109 110 /* peri_crg ctrl */ 111 #define CRGCTRL_PCIE_ASSERT_OFFSET 0x88 112 #define CRGCTRL_PCIE_ASSERT_BIT 0x8c000000 113 114 /* Time for delay */ 115 #define REF_2_PERST_MIN 21000 116 #define REF_2_PERST_MAX 25000 117 #define PERST_2_ACCESS_MIN 10000 118 #define PERST_2_ACCESS_MAX 12000 119 #define PIPE_CLK_WAIT_MIN 550 120 #define PIPE_CLK_WAIT_MAX 600 121 #define TIME_CMOS_MIN 100 122 #define TIME_CMOS_MAX 105 123 #define TIME_PHY_PD_MIN 10 124 #define TIME_PHY_PD_MAX 11 125 126 struct hi3660_pcie_phy { 127 struct device *dev; 128 void __iomem *base; 129 struct regmap *crgctrl; 130 struct regmap *sysctrl; 131 struct clk *apb_sys_clk; 132 struct clk *apb_phy_clk; 133 struct clk *phy_ref_clk; 134 struct clk *aclk; 135 struct clk *aux_clk; 136 }; 137 138 /* Registers in PCIePHY */ 139 static inline void kirin_apb_phy_writel(struct hi3660_pcie_phy *hi3660_pcie_phy, 140 u32 val, u32 reg) 141 { 142 writel(val, hi3660_pcie_phy->base + reg); 143 } 144 145 static inline u32 kirin_apb_phy_readl(struct hi3660_pcie_phy *hi3660_pcie_phy, 146 u32 reg) 147 { 148 return readl(hi3660_pcie_phy->base + reg); 149 } 150 151 static int hi3660_pcie_phy_get_clk(struct hi3660_pcie_phy *phy) 152 { 153 struct device *dev = phy->dev; 154 155 phy->phy_ref_clk = devm_clk_get(dev, "pcie_phy_ref"); 156 if (IS_ERR(phy->phy_ref_clk)) 157 return PTR_ERR(phy->phy_ref_clk); 158 159 phy->aux_clk = devm_clk_get(dev, "pcie_aux"); 160 if (IS_ERR(phy->aux_clk)) 161 return PTR_ERR(phy->aux_clk); 162 163 phy->apb_phy_clk = devm_clk_get(dev, "pcie_apb_phy"); 164 if (IS_ERR(phy->apb_phy_clk)) 165 return PTR_ERR(phy->apb_phy_clk); 166 167 phy->apb_sys_clk = devm_clk_get(dev, "pcie_apb_sys"); 168 if (IS_ERR(phy->apb_sys_clk)) 169 return PTR_ERR(phy->apb_sys_clk); 170 171 phy->aclk = devm_clk_get(dev, "pcie_aclk"); 172 if (IS_ERR(phy->aclk)) 173 return PTR_ERR(phy->aclk); 174 175 return 0; 176 } 177 178 static int hi3660_pcie_phy_get_resource(struct hi3660_pcie_phy *phy) 179 { 180 struct device *dev = phy->dev; 181 struct platform_device *pdev; 182 183 /* registers */ 184 pdev = container_of(dev, struct platform_device, dev); 185 186 phy->base = devm_platform_ioremap_resource_byname(pdev, "phy"); 187 if (IS_ERR(phy->base)) 188 return PTR_ERR(phy->base); 189 190 phy->crgctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3660-crgctrl"); 191 if (IS_ERR(phy->crgctrl)) 192 return PTR_ERR(phy->crgctrl); 193 194 phy->sysctrl = syscon_regmap_lookup_by_compatible("hisilicon,hi3660-sctrl"); 195 if (IS_ERR(phy->sysctrl)) 196 return PTR_ERR(phy->sysctrl); 197 198 return 0; 199 } 200 201 static int hi3660_pcie_phy_start(struct hi3660_pcie_phy *phy) 202 { 203 struct device *dev = phy->dev; 204 u32 reg_val; 205 206 reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_CTRL1); 207 reg_val &= ~PHY_REF_PAD_BIT; 208 kirin_apb_phy_writel(phy, reg_val, PCIE_APB_PHY_CTRL1); 209 210 reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_CTRL0); 211 reg_val &= ~PHY_PWR_DOWN_BIT; 212 kirin_apb_phy_writel(phy, reg_val, PCIE_APB_PHY_CTRL0); 213 usleep_range(TIME_PHY_PD_MIN, TIME_PHY_PD_MAX); 214 215 reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_CTRL1); 216 reg_val &= ~PHY_RST_ACK_BIT; 217 kirin_apb_phy_writel(phy, reg_val, PCIE_APB_PHY_CTRL1); 218 219 usleep_range(PIPE_CLK_WAIT_MIN, PIPE_CLK_WAIT_MAX); 220 reg_val = kirin_apb_phy_readl(phy, PCIE_APB_PHY_STATUS0); 221 if (reg_val & PIPE_CLK_STABLE) { 222 dev_err(dev, "PIPE clk is not stable\n"); 223 return -EINVAL; 224 } 225 226 return 0; 227 } 228 229 static void hi3660_pcie_phy_oe_enable(struct hi3660_pcie_phy *phy) 230 { 231 u32 val; 232 233 regmap_read(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, &val); 234 val |= PCIE_DEBOUNCE_PARAM; 235 val &= ~PCIE_OE_BYPASS; 236 regmap_write(phy->sysctrl, SCTRL_PCIE_OE_OFFSET, val); 237 } 238 239 static int hi3660_pcie_phy_clk_ctrl(struct hi3660_pcie_phy *phy, bool enable) 240 { 241 int ret = 0; 242 243 if (!enable) 244 goto close_clk; 245 246 ret = clk_set_rate(phy->phy_ref_clk, REF_CLK_FREQ); 247 if (ret) 248 return ret; 249 250 ret = clk_prepare_enable(phy->phy_ref_clk); 251 if (ret) 252 return ret; 253 254 ret = clk_prepare_enable(phy->apb_sys_clk); 255 if (ret) 256 goto apb_sys_fail; 257 258 ret = clk_prepare_enable(phy->apb_phy_clk); 259 if (ret) 260 goto apb_phy_fail; 261 262 ret = clk_prepare_enable(phy->aclk); 263 if (ret) 264 goto aclk_fail; 265 266 ret = clk_prepare_enable(phy->aux_clk); 267 if (ret) 268 goto aux_clk_fail; 269 270 return 0; 271 272 close_clk: 273 clk_disable_unprepare(phy->aux_clk); 274 aux_clk_fail: 275 clk_disable_unprepare(phy->aclk); 276 aclk_fail: 277 clk_disable_unprepare(phy->apb_phy_clk); 278 apb_phy_fail: 279 clk_disable_unprepare(phy->apb_sys_clk); 280 apb_sys_fail: 281 clk_disable_unprepare(phy->phy_ref_clk); 282 283 return ret; 284 } 285 286 static int hi3660_pcie_phy_power_on(struct kirin_pcie *pcie) 287 { 288 struct hi3660_pcie_phy *phy = pcie->phy_priv; 289 int ret; 290 291 /* Power supply for Host */ 292 regmap_write(phy->sysctrl, 293 SCTRL_PCIE_CMOS_OFFSET, SCTRL_PCIE_CMOS_BIT); 294 usleep_range(TIME_CMOS_MIN, TIME_CMOS_MAX); 295 296 hi3660_pcie_phy_oe_enable(phy); 297 298 ret = hi3660_pcie_phy_clk_ctrl(phy, true); 299 if (ret) 300 return ret; 301 302 /* ISO disable, PCIeCtrl, PHY assert and clk gate clear */ 303 regmap_write(phy->sysctrl, 304 SCTRL_PCIE_ISO_OFFSET, SCTRL_PCIE_ISO_BIT); 305 regmap_write(phy->crgctrl, 306 CRGCTRL_PCIE_ASSERT_OFFSET, CRGCTRL_PCIE_ASSERT_BIT); 307 regmap_write(phy->sysctrl, 308 SCTRL_PCIE_HPCLK_OFFSET, SCTRL_PCIE_HPCLK_BIT); 309 310 ret = hi3660_pcie_phy_start(phy); 311 if (ret) 312 goto disable_clks; 313 314 return 0; 315 316 disable_clks: 317 hi3660_pcie_phy_clk_ctrl(phy, false); 318 return ret; 319 } 320 321 static int hi3660_pcie_phy_init(struct platform_device *pdev, 322 struct kirin_pcie *pcie) 323 { 324 struct device *dev = &pdev->dev; 325 struct hi3660_pcie_phy *phy; 326 int ret; 327 328 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); 329 if (!phy) 330 return -ENOMEM; 331 332 pcie->phy_priv = phy; 333 phy->dev = dev; 334 335 ret = hi3660_pcie_phy_get_clk(phy); 336 if (ret) 337 return ret; 338 339 return hi3660_pcie_phy_get_resource(phy); 340 } 341 342 static int hi3660_pcie_phy_power_off(struct kirin_pcie *pcie) 343 { 344 struct hi3660_pcie_phy *phy = pcie->phy_priv; 345 346 /* Drop power supply for Host */ 347 regmap_write(phy->sysctrl, SCTRL_PCIE_CMOS_OFFSET, 0x00); 348 349 hi3660_pcie_phy_clk_ctrl(phy, false); 350 351 return 0; 352 } 353 354 /* 355 * The non-PHY part starts here 356 */ 357 358 static const struct regmap_config pcie_kirin_regmap_conf = { 359 .name = "kirin_pcie_apb", 360 .reg_bits = 32, 361 .val_bits = 32, 362 .reg_stride = 4, 363 }; 364 365 static int kirin_pcie_get_gpio_enable(struct kirin_pcie *pcie, 366 struct platform_device *pdev) 367 { 368 struct device *dev = &pdev->dev; 369 int ret, i; 370 371 /* This is an optional property */ 372 ret = gpiod_count(dev, "hisilicon,clken"); 373 if (ret < 0) 374 return 0; 375 376 if (ret > MAX_PCI_SLOTS) { 377 dev_err(dev, "Too many GPIO clock requests!\n"); 378 return -EINVAL; 379 } 380 381 pcie->n_gpio_clkreq = ret; 382 383 for (i = 0; i < pcie->n_gpio_clkreq; i++) { 384 pcie->gpio_id_clkreq[i] = of_get_named_gpio(dev->of_node, 385 "hisilicon,clken-gpios", i); 386 if (pcie->gpio_id_clkreq[i] < 0) 387 return pcie->gpio_id_clkreq[i]; 388 389 pcie->clkreq_names[i] = devm_kasprintf(dev, GFP_KERNEL, 390 "pcie_clkreq_%d", i); 391 if (!pcie->clkreq_names[i]) 392 return -ENOMEM; 393 } 394 395 return 0; 396 } 397 398 static int kirin_pcie_parse_port(struct kirin_pcie *pcie, 399 struct platform_device *pdev, 400 struct device_node *node) 401 { 402 struct device *dev = &pdev->dev; 403 struct device_node *parent, *child; 404 int ret, slot, i; 405 406 for_each_available_child_of_node(node, parent) { 407 for_each_available_child_of_node(parent, child) { 408 i = pcie->num_slots; 409 410 pcie->gpio_id_reset[i] = of_get_named_gpio(child, 411 "reset-gpios", 0); 412 if (pcie->gpio_id_reset[i] < 0) 413 continue; 414 415 pcie->num_slots++; 416 if (pcie->num_slots > MAX_PCI_SLOTS) { 417 dev_err(dev, "Too many PCI slots!\n"); 418 ret = -EINVAL; 419 goto put_node; 420 } 421 422 ret = of_pci_get_devfn(child); 423 if (ret < 0) { 424 dev_err(dev, "failed to parse devfn: %d\n", ret); 425 goto put_node; 426 } 427 428 slot = PCI_SLOT(ret); 429 430 pcie->reset_names[i] = devm_kasprintf(dev, GFP_KERNEL, 431 "pcie_perst_%d", 432 slot); 433 if (!pcie->reset_names[i]) { 434 ret = -ENOMEM; 435 goto put_node; 436 } 437 } 438 } 439 440 return 0; 441 442 put_node: 443 of_node_put(child); 444 of_node_put(parent); 445 return ret; 446 } 447 448 static long kirin_pcie_get_resource(struct kirin_pcie *kirin_pcie, 449 struct platform_device *pdev) 450 { 451 struct device *dev = &pdev->dev; 452 struct device_node *child, *node = dev->of_node; 453 void __iomem *apb_base; 454 int ret; 455 456 apb_base = devm_platform_ioremap_resource_byname(pdev, "apb"); 457 if (IS_ERR(apb_base)) 458 return PTR_ERR(apb_base); 459 460 kirin_pcie->apb = devm_regmap_init_mmio(dev, apb_base, 461 &pcie_kirin_regmap_conf); 462 if (IS_ERR(kirin_pcie->apb)) 463 return PTR_ERR(kirin_pcie->apb); 464 465 /* pcie internal PERST# gpio */ 466 kirin_pcie->gpio_id_dwc_perst = of_get_named_gpio(dev->of_node, 467 "reset-gpios", 0); 468 if (kirin_pcie->gpio_id_dwc_perst == -EPROBE_DEFER) { 469 return -EPROBE_DEFER; 470 } else if (!gpio_is_valid(kirin_pcie->gpio_id_dwc_perst)) { 471 dev_err(dev, "unable to get a valid gpio pin\n"); 472 return -ENODEV; 473 } 474 475 ret = kirin_pcie_get_gpio_enable(kirin_pcie, pdev); 476 if (ret) 477 return ret; 478 479 /* Parse OF children */ 480 for_each_available_child_of_node(node, child) { 481 ret = kirin_pcie_parse_port(kirin_pcie, pdev, child); 482 if (ret) 483 goto put_node; 484 } 485 486 return 0; 487 488 put_node: 489 of_node_put(child); 490 return ret; 491 } 492 493 static void kirin_pcie_sideband_dbi_w_mode(struct kirin_pcie *kirin_pcie, 494 bool on) 495 { 496 u32 val; 497 498 regmap_read(kirin_pcie->apb, SOC_PCIECTRL_CTRL0_ADDR, &val); 499 if (on) 500 val = val | PCIE_ELBI_SLV_DBI_ENABLE; 501 else 502 val = val & ~PCIE_ELBI_SLV_DBI_ENABLE; 503 504 regmap_write(kirin_pcie->apb, SOC_PCIECTRL_CTRL0_ADDR, val); 505 } 506 507 static void kirin_pcie_sideband_dbi_r_mode(struct kirin_pcie *kirin_pcie, 508 bool on) 509 { 510 u32 val; 511 512 regmap_read(kirin_pcie->apb, SOC_PCIECTRL_CTRL1_ADDR, &val); 513 if (on) 514 val = val | PCIE_ELBI_SLV_DBI_ENABLE; 515 else 516 val = val & ~PCIE_ELBI_SLV_DBI_ENABLE; 517 518 regmap_write(kirin_pcie->apb, SOC_PCIECTRL_CTRL1_ADDR, val); 519 } 520 521 static int kirin_pcie_rd_own_conf(struct pci_bus *bus, unsigned int devfn, 522 int where, int size, u32 *val) 523 { 524 struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata); 525 526 if (PCI_SLOT(devfn)) 527 return PCIBIOS_DEVICE_NOT_FOUND; 528 529 *val = dw_pcie_read_dbi(pci, where, size); 530 return PCIBIOS_SUCCESSFUL; 531 } 532 533 static int kirin_pcie_wr_own_conf(struct pci_bus *bus, unsigned int devfn, 534 int where, int size, u32 val) 535 { 536 struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata); 537 538 if (PCI_SLOT(devfn)) 539 return PCIBIOS_DEVICE_NOT_FOUND; 540 541 dw_pcie_write_dbi(pci, where, size, val); 542 return PCIBIOS_SUCCESSFUL; 543 } 544 545 static int kirin_pcie_add_bus(struct pci_bus *bus) 546 { 547 struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata); 548 struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); 549 int i, ret; 550 551 if (!kirin_pcie->num_slots) 552 return 0; 553 554 /* Send PERST# to each slot */ 555 for (i = 0; i < kirin_pcie->num_slots; i++) { 556 ret = gpio_direction_output(kirin_pcie->gpio_id_reset[i], 1); 557 if (ret) { 558 dev_err(pci->dev, "PERST# %s error: %d\n", 559 kirin_pcie->reset_names[i], ret); 560 } 561 } 562 usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX); 563 564 return 0; 565 } 566 567 static struct pci_ops kirin_pci_ops = { 568 .read = kirin_pcie_rd_own_conf, 569 .write = kirin_pcie_wr_own_conf, 570 .add_bus = kirin_pcie_add_bus, 571 }; 572 573 static u32 kirin_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, 574 u32 reg, size_t size) 575 { 576 struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); 577 u32 ret; 578 579 kirin_pcie_sideband_dbi_r_mode(kirin_pcie, true); 580 dw_pcie_read(base + reg, size, &ret); 581 kirin_pcie_sideband_dbi_r_mode(kirin_pcie, false); 582 583 return ret; 584 } 585 586 static void kirin_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, 587 u32 reg, size_t size, u32 val) 588 { 589 struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); 590 591 kirin_pcie_sideband_dbi_w_mode(kirin_pcie, true); 592 dw_pcie_write(base + reg, size, val); 593 kirin_pcie_sideband_dbi_w_mode(kirin_pcie, false); 594 } 595 596 static int kirin_pcie_link_up(struct dw_pcie *pci) 597 { 598 struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); 599 u32 val; 600 601 regmap_read(kirin_pcie->apb, PCIE_APB_PHY_STATUS0, &val); 602 if ((val & PCIE_LINKUP_ENABLE) == PCIE_LINKUP_ENABLE) 603 return 1; 604 605 return 0; 606 } 607 608 static int kirin_pcie_start_link(struct dw_pcie *pci) 609 { 610 struct kirin_pcie *kirin_pcie = to_kirin_pcie(pci); 611 612 /* assert LTSSM enable */ 613 regmap_write(kirin_pcie->apb, PCIE_APP_LTSSM_ENABLE, 614 PCIE_LTSSM_ENABLE_BIT); 615 616 return 0; 617 } 618 619 static int kirin_pcie_host_init(struct dw_pcie_rp *pp) 620 { 621 pp->bridge->ops = &kirin_pci_ops; 622 623 return 0; 624 } 625 626 static int kirin_pcie_gpio_request(struct kirin_pcie *kirin_pcie, 627 struct device *dev) 628 { 629 int ret, i; 630 631 for (i = 0; i < kirin_pcie->num_slots; i++) { 632 if (!gpio_is_valid(kirin_pcie->gpio_id_reset[i])) { 633 dev_err(dev, "unable to get a valid %s gpio\n", 634 kirin_pcie->reset_names[i]); 635 return -ENODEV; 636 } 637 638 ret = devm_gpio_request(dev, kirin_pcie->gpio_id_reset[i], 639 kirin_pcie->reset_names[i]); 640 if (ret) 641 return ret; 642 } 643 644 for (i = 0; i < kirin_pcie->n_gpio_clkreq; i++) { 645 if (!gpio_is_valid(kirin_pcie->gpio_id_clkreq[i])) { 646 dev_err(dev, "unable to get a valid %s gpio\n", 647 kirin_pcie->clkreq_names[i]); 648 return -ENODEV; 649 } 650 651 ret = devm_gpio_request(dev, kirin_pcie->gpio_id_clkreq[i], 652 kirin_pcie->clkreq_names[i]); 653 if (ret) 654 return ret; 655 656 ret = gpio_direction_output(kirin_pcie->gpio_id_clkreq[i], 0); 657 if (ret) 658 return ret; 659 } 660 661 return 0; 662 } 663 664 static const struct dw_pcie_ops kirin_dw_pcie_ops = { 665 .read_dbi = kirin_pcie_read_dbi, 666 .write_dbi = kirin_pcie_write_dbi, 667 .link_up = kirin_pcie_link_up, 668 .start_link = kirin_pcie_start_link, 669 }; 670 671 static const struct dw_pcie_host_ops kirin_pcie_host_ops = { 672 .init = kirin_pcie_host_init, 673 }; 674 675 static int kirin_pcie_power_off(struct kirin_pcie *kirin_pcie) 676 { 677 int i; 678 679 if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY) 680 return hi3660_pcie_phy_power_off(kirin_pcie); 681 682 for (i = 0; i < kirin_pcie->n_gpio_clkreq; i++) 683 gpio_direction_output(kirin_pcie->gpio_id_clkreq[i], 1); 684 685 phy_power_off(kirin_pcie->phy); 686 phy_exit(kirin_pcie->phy); 687 688 return 0; 689 } 690 691 static int kirin_pcie_power_on(struct platform_device *pdev, 692 struct kirin_pcie *kirin_pcie) 693 { 694 struct device *dev = &pdev->dev; 695 int ret; 696 697 if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY) { 698 ret = hi3660_pcie_phy_init(pdev, kirin_pcie); 699 if (ret) 700 return ret; 701 702 ret = hi3660_pcie_phy_power_on(kirin_pcie); 703 if (ret) 704 return ret; 705 } else { 706 kirin_pcie->phy = devm_of_phy_get(dev, dev->of_node, NULL); 707 if (IS_ERR(kirin_pcie->phy)) 708 return PTR_ERR(kirin_pcie->phy); 709 710 ret = kirin_pcie_gpio_request(kirin_pcie, dev); 711 if (ret) 712 return ret; 713 714 ret = phy_init(kirin_pcie->phy); 715 if (ret) 716 goto err; 717 718 ret = phy_power_on(kirin_pcie->phy); 719 if (ret) 720 goto err; 721 } 722 723 /* perst assert Endpoint */ 724 usleep_range(REF_2_PERST_MIN, REF_2_PERST_MAX); 725 726 if (!gpio_request(kirin_pcie->gpio_id_dwc_perst, "pcie_perst_bridge")) { 727 ret = gpio_direction_output(kirin_pcie->gpio_id_dwc_perst, 1); 728 if (ret) 729 goto err; 730 } 731 732 usleep_range(PERST_2_ACCESS_MIN, PERST_2_ACCESS_MAX); 733 734 return 0; 735 err: 736 kirin_pcie_power_off(kirin_pcie); 737 738 return ret; 739 } 740 741 static void kirin_pcie_remove(struct platform_device *pdev) 742 { 743 struct kirin_pcie *kirin_pcie = platform_get_drvdata(pdev); 744 745 dw_pcie_host_deinit(&kirin_pcie->pci->pp); 746 747 kirin_pcie_power_off(kirin_pcie); 748 } 749 750 struct kirin_pcie_data { 751 enum pcie_kirin_phy_type phy_type; 752 }; 753 754 static const struct kirin_pcie_data kirin_960_data = { 755 .phy_type = PCIE_KIRIN_INTERNAL_PHY, 756 }; 757 758 static const struct kirin_pcie_data kirin_970_data = { 759 .phy_type = PCIE_KIRIN_EXTERNAL_PHY, 760 }; 761 762 static const struct of_device_id kirin_pcie_match[] = { 763 { .compatible = "hisilicon,kirin960-pcie", .data = &kirin_960_data }, 764 { .compatible = "hisilicon,kirin970-pcie", .data = &kirin_970_data }, 765 {}, 766 }; 767 768 static int kirin_pcie_probe(struct platform_device *pdev) 769 { 770 struct device *dev = &pdev->dev; 771 const struct kirin_pcie_data *data; 772 struct kirin_pcie *kirin_pcie; 773 struct dw_pcie *pci; 774 int ret; 775 776 if (!dev->of_node) { 777 dev_err(dev, "NULL node\n"); 778 return -EINVAL; 779 } 780 781 data = of_device_get_match_data(dev); 782 if (!data) { 783 dev_err(dev, "OF data missing\n"); 784 return -EINVAL; 785 } 786 787 kirin_pcie = devm_kzalloc(dev, sizeof(struct kirin_pcie), GFP_KERNEL); 788 if (!kirin_pcie) 789 return -ENOMEM; 790 791 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); 792 if (!pci) 793 return -ENOMEM; 794 795 pci->dev = dev; 796 pci->ops = &kirin_dw_pcie_ops; 797 pci->pp.ops = &kirin_pcie_host_ops; 798 kirin_pcie->pci = pci; 799 kirin_pcie->type = data->phy_type; 800 801 ret = kirin_pcie_get_resource(kirin_pcie, pdev); 802 if (ret) 803 return ret; 804 805 platform_set_drvdata(pdev, kirin_pcie); 806 807 ret = kirin_pcie_power_on(pdev, kirin_pcie); 808 if (ret) 809 return ret; 810 811 return dw_pcie_host_init(&pci->pp); 812 } 813 814 static struct platform_driver kirin_pcie_driver = { 815 .probe = kirin_pcie_probe, 816 .remove_new = kirin_pcie_remove, 817 .driver = { 818 .name = "kirin-pcie", 819 .of_match_table = kirin_pcie_match, 820 .suppress_bind_attrs = true, 821 }, 822 }; 823 module_platform_driver(kirin_pcie_driver); 824 825 MODULE_DEVICE_TABLE(of, kirin_pcie_match); 826 MODULE_DESCRIPTION("PCIe host controller driver for Kirin Phone SoCs"); 827 MODULE_AUTHOR("Xiaowei Song <songxiaowei@huawei.com>"); 828 MODULE_LICENSE("GPL v2"); 829