1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * PCIe host controller driver for Texas Instruments Keystone SoCs 4 * 5 * Copyright (C) 2013-2014 Texas Instruments., Ltd. 6 * https://www.ti.com 7 * 8 * Author: Murali Karicheri <m-karicheri2@ti.com> 9 * Implementation based on pci-exynos.c and pcie-designware.c 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/delay.h> 14 #include <linux/gpio/consumer.h> 15 #include <linux/init.h> 16 #include <linux/interrupt.h> 17 #include <linux/irqchip/chained_irq.h> 18 #include <linux/irqdomain.h> 19 #include <linux/mfd/syscon.h> 20 #include <linux/msi.h> 21 #include <linux/of.h> 22 #include <linux/of_device.h> 23 #include <linux/of_irq.h> 24 #include <linux/of_pci.h> 25 #include <linux/phy/phy.h> 26 #include <linux/platform_device.h> 27 #include <linux/regmap.h> 28 #include <linux/resource.h> 29 #include <linux/signal.h> 30 31 #include "../../pci.h" 32 #include "pcie-designware.h" 33 34 #define PCIE_VENDORID_MASK 0xffff 35 #define PCIE_DEVICEID_SHIFT 16 36 37 /* Application registers */ 38 #define CMD_STATUS 0x004 39 #define LTSSM_EN_VAL BIT(0) 40 #define OB_XLAT_EN_VAL BIT(1) 41 #define DBI_CS2 BIT(5) 42 43 #define CFG_SETUP 0x008 44 #define CFG_BUS(x) (((x) & 0xff) << 16) 45 #define CFG_DEVICE(x) (((x) & 0x1f) << 8) 46 #define CFG_FUNC(x) ((x) & 0x7) 47 #define CFG_TYPE1 BIT(24) 48 49 #define OB_SIZE 0x030 50 #define OB_OFFSET_INDEX(n) (0x200 + (8 * (n))) 51 #define OB_OFFSET_HI(n) (0x204 + (8 * (n))) 52 #define OB_ENABLEN BIT(0) 53 #define OB_WIN_SIZE 8 /* 8MB */ 54 55 #define PCIE_LEGACY_IRQ_ENABLE_SET(n) (0x188 + (0x10 * ((n) - 1))) 56 #define PCIE_LEGACY_IRQ_ENABLE_CLR(n) (0x18c + (0x10 * ((n) - 1))) 57 #define PCIE_EP_IRQ_SET 0x64 58 #define PCIE_EP_IRQ_CLR 0x68 59 #define INT_ENABLE BIT(0) 60 61 /* IRQ register defines */ 62 #define IRQ_EOI 0x050 63 64 #define MSI_IRQ 0x054 65 #define MSI_IRQ_STATUS(n) (0x104 + ((n) << 4)) 66 #define MSI_IRQ_ENABLE_SET(n) (0x108 + ((n) << 4)) 67 #define MSI_IRQ_ENABLE_CLR(n) (0x10c + ((n) << 4)) 68 #define MSI_IRQ_OFFSET 4 69 70 #define IRQ_STATUS(n) (0x184 + ((n) << 4)) 71 #define IRQ_ENABLE_SET(n) (0x188 + ((n) << 4)) 72 #define INTx_EN BIT(0) 73 74 #define ERR_IRQ_STATUS 0x1c4 75 #define ERR_IRQ_ENABLE_SET 0x1c8 76 #define ERR_AER BIT(5) /* ECRC error */ 77 #define AM6_ERR_AER BIT(4) /* AM6 ECRC error */ 78 #define ERR_AXI BIT(4) /* AXI tag lookup fatal error */ 79 #define ERR_CORR BIT(3) /* Correctable error */ 80 #define ERR_NONFATAL BIT(2) /* Non-fatal error */ 81 #define ERR_FATAL BIT(1) /* Fatal error */ 82 #define ERR_SYS BIT(0) /* System error */ 83 #define ERR_IRQ_ALL (ERR_AER | ERR_AXI | ERR_CORR | \ 84 ERR_NONFATAL | ERR_FATAL | ERR_SYS) 85 86 /* PCIE controller device IDs */ 87 #define PCIE_RC_K2HK 0xb008 88 #define PCIE_RC_K2E 0xb009 89 #define PCIE_RC_K2L 0xb00a 90 #define PCIE_RC_K2G 0xb00b 91 92 #define KS_PCIE_DEV_TYPE_MASK (0x3 << 1) 93 #define KS_PCIE_DEV_TYPE(mode) ((mode) << 1) 94 95 #define EP 0x0 96 #define LEG_EP 0x1 97 #define RC 0x2 98 99 #define KS_PCIE_SYSCLOCKOUTEN BIT(0) 100 101 #define AM654_PCIE_DEV_TYPE_MASK 0x3 102 #define AM654_WIN_SIZE SZ_64K 103 104 #define APP_ADDR_SPACE_0 (16 * SZ_1K) 105 106 #define to_keystone_pcie(x) dev_get_drvdata((x)->dev) 107 108 struct ks_pcie_of_data { 109 enum dw_pcie_device_mode mode; 110 const struct dw_pcie_host_ops *host_ops; 111 const struct dw_pcie_ep_ops *ep_ops; 112 u32 version; 113 }; 114 115 struct keystone_pcie { 116 struct dw_pcie *pci; 117 /* PCI Device ID */ 118 u32 device_id; 119 int legacy_host_irqs[PCI_NUM_INTX]; 120 struct device_node *legacy_intc_np; 121 122 int msi_host_irq; 123 int num_lanes; 124 u32 num_viewport; 125 struct phy **phy; 126 struct device_link **link; 127 struct device_node *msi_intc_np; 128 struct irq_domain *legacy_irq_domain; 129 struct device_node *np; 130 131 /* Application register space */ 132 void __iomem *va_app_base; /* DT 1st resource */ 133 struct resource app; 134 bool is_am6; 135 }; 136 137 static u32 ks_pcie_app_readl(struct keystone_pcie *ks_pcie, u32 offset) 138 { 139 return readl(ks_pcie->va_app_base + offset); 140 } 141 142 static void ks_pcie_app_writel(struct keystone_pcie *ks_pcie, u32 offset, 143 u32 val) 144 { 145 writel(val, ks_pcie->va_app_base + offset); 146 } 147 148 static void ks_pcie_msi_irq_ack(struct irq_data *data) 149 { 150 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(data); 151 struct keystone_pcie *ks_pcie; 152 u32 irq = data->hwirq; 153 struct dw_pcie *pci; 154 u32 reg_offset; 155 u32 bit_pos; 156 157 pci = to_dw_pcie_from_pp(pp); 158 ks_pcie = to_keystone_pcie(pci); 159 160 reg_offset = irq % 8; 161 bit_pos = irq >> 3; 162 163 ks_pcie_app_writel(ks_pcie, MSI_IRQ_STATUS(reg_offset), 164 BIT(bit_pos)); 165 ks_pcie_app_writel(ks_pcie, IRQ_EOI, reg_offset + MSI_IRQ_OFFSET); 166 } 167 168 static void ks_pcie_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) 169 { 170 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(data); 171 struct keystone_pcie *ks_pcie; 172 struct dw_pcie *pci; 173 u64 msi_target; 174 175 pci = to_dw_pcie_from_pp(pp); 176 ks_pcie = to_keystone_pcie(pci); 177 178 msi_target = ks_pcie->app.start + MSI_IRQ; 179 msg->address_lo = lower_32_bits(msi_target); 180 msg->address_hi = upper_32_bits(msi_target); 181 msg->data = data->hwirq; 182 183 dev_dbg(pci->dev, "msi#%d address_hi %#x address_lo %#x\n", 184 (int)data->hwirq, msg->address_hi, msg->address_lo); 185 } 186 187 static int ks_pcie_msi_set_affinity(struct irq_data *irq_data, 188 const struct cpumask *mask, bool force) 189 { 190 return -EINVAL; 191 } 192 193 static void ks_pcie_msi_mask(struct irq_data *data) 194 { 195 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(data); 196 struct keystone_pcie *ks_pcie; 197 u32 irq = data->hwirq; 198 struct dw_pcie *pci; 199 unsigned long flags; 200 u32 reg_offset; 201 u32 bit_pos; 202 203 raw_spin_lock_irqsave(&pp->lock, flags); 204 205 pci = to_dw_pcie_from_pp(pp); 206 ks_pcie = to_keystone_pcie(pci); 207 208 reg_offset = irq % 8; 209 bit_pos = irq >> 3; 210 211 ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_CLR(reg_offset), 212 BIT(bit_pos)); 213 214 raw_spin_unlock_irqrestore(&pp->lock, flags); 215 } 216 217 static void ks_pcie_msi_unmask(struct irq_data *data) 218 { 219 struct dw_pcie_rp *pp = irq_data_get_irq_chip_data(data); 220 struct keystone_pcie *ks_pcie; 221 u32 irq = data->hwirq; 222 struct dw_pcie *pci; 223 unsigned long flags; 224 u32 reg_offset; 225 u32 bit_pos; 226 227 raw_spin_lock_irqsave(&pp->lock, flags); 228 229 pci = to_dw_pcie_from_pp(pp); 230 ks_pcie = to_keystone_pcie(pci); 231 232 reg_offset = irq % 8; 233 bit_pos = irq >> 3; 234 235 ks_pcie_app_writel(ks_pcie, MSI_IRQ_ENABLE_SET(reg_offset), 236 BIT(bit_pos)); 237 238 raw_spin_unlock_irqrestore(&pp->lock, flags); 239 } 240 241 static struct irq_chip ks_pcie_msi_irq_chip = { 242 .name = "KEYSTONE-PCI-MSI", 243 .irq_ack = ks_pcie_msi_irq_ack, 244 .irq_compose_msi_msg = ks_pcie_compose_msi_msg, 245 .irq_set_affinity = ks_pcie_msi_set_affinity, 246 .irq_mask = ks_pcie_msi_mask, 247 .irq_unmask = ks_pcie_msi_unmask, 248 }; 249 250 static int ks_pcie_msi_host_init(struct dw_pcie_rp *pp) 251 { 252 pp->msi_irq_chip = &ks_pcie_msi_irq_chip; 253 return dw_pcie_allocate_domains(pp); 254 } 255 256 static void ks_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, 257 int offset) 258 { 259 struct dw_pcie *pci = ks_pcie->pci; 260 struct device *dev = pci->dev; 261 u32 pending; 262 263 pending = ks_pcie_app_readl(ks_pcie, IRQ_STATUS(offset)); 264 265 if (BIT(0) & pending) { 266 dev_dbg(dev, ": irq: irq_offset %d", offset); 267 generic_handle_domain_irq(ks_pcie->legacy_irq_domain, offset); 268 } 269 270 /* EOI the INTx interrupt */ 271 ks_pcie_app_writel(ks_pcie, IRQ_EOI, offset); 272 } 273 274 static void ks_pcie_enable_error_irq(struct keystone_pcie *ks_pcie) 275 { 276 ks_pcie_app_writel(ks_pcie, ERR_IRQ_ENABLE_SET, ERR_IRQ_ALL); 277 } 278 279 static irqreturn_t ks_pcie_handle_error_irq(struct keystone_pcie *ks_pcie) 280 { 281 u32 reg; 282 struct device *dev = ks_pcie->pci->dev; 283 284 reg = ks_pcie_app_readl(ks_pcie, ERR_IRQ_STATUS); 285 if (!reg) 286 return IRQ_NONE; 287 288 if (reg & ERR_SYS) 289 dev_err(dev, "System Error\n"); 290 291 if (reg & ERR_FATAL) 292 dev_err(dev, "Fatal Error\n"); 293 294 if (reg & ERR_NONFATAL) 295 dev_dbg(dev, "Non Fatal Error\n"); 296 297 if (reg & ERR_CORR) 298 dev_dbg(dev, "Correctable Error\n"); 299 300 if (!ks_pcie->is_am6 && (reg & ERR_AXI)) 301 dev_err(dev, "AXI tag lookup fatal Error\n"); 302 303 if (reg & ERR_AER || (ks_pcie->is_am6 && (reg & AM6_ERR_AER))) 304 dev_err(dev, "ECRC Error\n"); 305 306 ks_pcie_app_writel(ks_pcie, ERR_IRQ_STATUS, reg); 307 308 return IRQ_HANDLED; 309 } 310 311 static void ks_pcie_ack_legacy_irq(struct irq_data *d) 312 { 313 } 314 315 static void ks_pcie_mask_legacy_irq(struct irq_data *d) 316 { 317 } 318 319 static void ks_pcie_unmask_legacy_irq(struct irq_data *d) 320 { 321 } 322 323 static struct irq_chip ks_pcie_legacy_irq_chip = { 324 .name = "Keystone-PCI-Legacy-IRQ", 325 .irq_ack = ks_pcie_ack_legacy_irq, 326 .irq_mask = ks_pcie_mask_legacy_irq, 327 .irq_unmask = ks_pcie_unmask_legacy_irq, 328 }; 329 330 static int ks_pcie_init_legacy_irq_map(struct irq_domain *d, 331 unsigned int irq, 332 irq_hw_number_t hw_irq) 333 { 334 irq_set_chip_and_handler(irq, &ks_pcie_legacy_irq_chip, 335 handle_level_irq); 336 irq_set_chip_data(irq, d->host_data); 337 338 return 0; 339 } 340 341 static const struct irq_domain_ops ks_pcie_legacy_irq_domain_ops = { 342 .map = ks_pcie_init_legacy_irq_map, 343 .xlate = irq_domain_xlate_onetwocell, 344 }; 345 346 /** 347 * ks_pcie_set_dbi_mode() - Set DBI mode to access overlaid BAR mask registers 348 * @ks_pcie: A pointer to the keystone_pcie structure which holds the KeyStone 349 * PCIe host controller driver information. 350 * 351 * Since modification of dbi_cs2 involves different clock domain, read the 352 * status back to ensure the transition is complete. 353 */ 354 static void ks_pcie_set_dbi_mode(struct keystone_pcie *ks_pcie) 355 { 356 u32 val; 357 358 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS); 359 val |= DBI_CS2; 360 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val); 361 362 do { 363 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS); 364 } while (!(val & DBI_CS2)); 365 } 366 367 /** 368 * ks_pcie_clear_dbi_mode() - Disable DBI mode 369 * @ks_pcie: A pointer to the keystone_pcie structure which holds the KeyStone 370 * PCIe host controller driver information. 371 * 372 * Since modification of dbi_cs2 involves different clock domain, read the 373 * status back to ensure the transition is complete. 374 */ 375 static void ks_pcie_clear_dbi_mode(struct keystone_pcie *ks_pcie) 376 { 377 u32 val; 378 379 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS); 380 val &= ~DBI_CS2; 381 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val); 382 383 do { 384 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS); 385 } while (val & DBI_CS2); 386 } 387 388 static void ks_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie) 389 { 390 u32 val; 391 u32 num_viewport = ks_pcie->num_viewport; 392 struct dw_pcie *pci = ks_pcie->pci; 393 struct dw_pcie_rp *pp = &pci->pp; 394 u64 start, end; 395 struct resource *mem; 396 int i; 397 398 mem = resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM)->res; 399 start = mem->start; 400 end = mem->end; 401 402 /* Disable BARs for inbound access */ 403 ks_pcie_set_dbi_mode(ks_pcie); 404 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 0); 405 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0); 406 ks_pcie_clear_dbi_mode(ks_pcie); 407 408 if (ks_pcie->is_am6) 409 return; 410 411 val = ilog2(OB_WIN_SIZE); 412 ks_pcie_app_writel(ks_pcie, OB_SIZE, val); 413 414 /* Using Direct 1:1 mapping of RC <-> PCI memory space */ 415 for (i = 0; i < num_viewport && (start < end); i++) { 416 ks_pcie_app_writel(ks_pcie, OB_OFFSET_INDEX(i), 417 lower_32_bits(start) | OB_ENABLEN); 418 ks_pcie_app_writel(ks_pcie, OB_OFFSET_HI(i), 419 upper_32_bits(start)); 420 start += OB_WIN_SIZE * SZ_1M; 421 } 422 423 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS); 424 val |= OB_XLAT_EN_VAL; 425 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val); 426 } 427 428 static void __iomem *ks_pcie_other_map_bus(struct pci_bus *bus, 429 unsigned int devfn, int where) 430 { 431 struct dw_pcie_rp *pp = bus->sysdata; 432 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 433 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci); 434 u32 reg; 435 436 reg = CFG_BUS(bus->number) | CFG_DEVICE(PCI_SLOT(devfn)) | 437 CFG_FUNC(PCI_FUNC(devfn)); 438 if (!pci_is_root_bus(bus->parent)) 439 reg |= CFG_TYPE1; 440 ks_pcie_app_writel(ks_pcie, CFG_SETUP, reg); 441 442 return pp->va_cfg0_base + where; 443 } 444 445 static struct pci_ops ks_child_pcie_ops = { 446 .map_bus = ks_pcie_other_map_bus, 447 .read = pci_generic_config_read, 448 .write = pci_generic_config_write, 449 }; 450 451 /** 452 * ks_pcie_v3_65_add_bus() - keystone add_bus post initialization 453 * @bus: A pointer to the PCI bus structure. 454 * 455 * This sets BAR0 to enable inbound access for MSI_IRQ register 456 */ 457 static int ks_pcie_v3_65_add_bus(struct pci_bus *bus) 458 { 459 struct dw_pcie_rp *pp = bus->sysdata; 460 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 461 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci); 462 463 if (!pci_is_root_bus(bus)) 464 return 0; 465 466 /* Configure and set up BAR0 */ 467 ks_pcie_set_dbi_mode(ks_pcie); 468 469 /* Enable BAR0 */ 470 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, 1); 471 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, SZ_4K - 1); 472 473 ks_pcie_clear_dbi_mode(ks_pcie); 474 475 /* 476 * For BAR0, just setting bus address for inbound writes (MSI) should 477 * be sufficient. Use physical address to avoid any conflicts. 478 */ 479 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, ks_pcie->app.start); 480 481 return 0; 482 } 483 484 static struct pci_ops ks_pcie_ops = { 485 .map_bus = dw_pcie_own_conf_map_bus, 486 .read = pci_generic_config_read, 487 .write = pci_generic_config_write, 488 .add_bus = ks_pcie_v3_65_add_bus, 489 }; 490 491 /** 492 * ks_pcie_link_up() - Check if link up 493 * @pci: A pointer to the dw_pcie structure which holds the DesignWare PCIe host 494 * controller driver information. 495 */ 496 static int ks_pcie_link_up(struct dw_pcie *pci) 497 { 498 u32 val; 499 500 val = dw_pcie_readl_dbi(pci, PCIE_PORT_DEBUG0); 501 val &= PORT_LOGIC_LTSSM_STATE_MASK; 502 return (val == PORT_LOGIC_LTSSM_STATE_L0); 503 } 504 505 static void ks_pcie_stop_link(struct dw_pcie *pci) 506 { 507 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci); 508 u32 val; 509 510 /* Disable Link training */ 511 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS); 512 val &= ~LTSSM_EN_VAL; 513 ks_pcie_app_writel(ks_pcie, CMD_STATUS, val); 514 } 515 516 static int ks_pcie_start_link(struct dw_pcie *pci) 517 { 518 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci); 519 u32 val; 520 521 /* Initiate Link Training */ 522 val = ks_pcie_app_readl(ks_pcie, CMD_STATUS); 523 ks_pcie_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val); 524 525 return 0; 526 } 527 528 static void ks_pcie_quirk(struct pci_dev *dev) 529 { 530 struct pci_bus *bus = dev->bus; 531 struct pci_dev *bridge; 532 static const struct pci_device_id rc_pci_devids[] = { 533 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2HK), 534 .class = PCI_CLASS_BRIDGE_PCI_NORMAL, .class_mask = ~0, }, 535 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2E), 536 .class = PCI_CLASS_BRIDGE_PCI_NORMAL, .class_mask = ~0, }, 537 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2L), 538 .class = PCI_CLASS_BRIDGE_PCI_NORMAL, .class_mask = ~0, }, 539 { PCI_DEVICE(PCI_VENDOR_ID_TI, PCIE_RC_K2G), 540 .class = PCI_CLASS_BRIDGE_PCI_NORMAL, .class_mask = ~0, }, 541 { 0, }, 542 }; 543 544 if (pci_is_root_bus(bus)) 545 bridge = dev; 546 547 /* look for the host bridge */ 548 while (!pci_is_root_bus(bus)) { 549 bridge = bus->self; 550 bus = bus->parent; 551 } 552 553 if (!bridge) 554 return; 555 556 /* 557 * Keystone PCI controller has a h/w limitation of 558 * 256 bytes maximum read request size. It can't handle 559 * anything higher than this. So force this limit on 560 * all downstream devices. 561 */ 562 if (pci_match_id(rc_pci_devids, bridge)) { 563 if (pcie_get_readrq(dev) > 256) { 564 dev_info(&dev->dev, "limiting MRRS to 256\n"); 565 pcie_set_readrq(dev, 256); 566 } 567 } 568 } 569 DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, ks_pcie_quirk); 570 571 static void ks_pcie_msi_irq_handler(struct irq_desc *desc) 572 { 573 unsigned int irq = desc->irq_data.hwirq; 574 struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc); 575 u32 offset = irq - ks_pcie->msi_host_irq; 576 struct dw_pcie *pci = ks_pcie->pci; 577 struct dw_pcie_rp *pp = &pci->pp; 578 struct device *dev = pci->dev; 579 struct irq_chip *chip = irq_desc_get_chip(desc); 580 u32 vector, reg, pos; 581 582 dev_dbg(dev, "%s, irq %d\n", __func__, irq); 583 584 /* 585 * The chained irq handler installation would have replaced normal 586 * interrupt driver handler so we need to take care of mask/unmask and 587 * ack operation. 588 */ 589 chained_irq_enter(chip, desc); 590 591 reg = ks_pcie_app_readl(ks_pcie, MSI_IRQ_STATUS(offset)); 592 /* 593 * MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit 594 * shows 1, 9, 17, 25 and so forth 595 */ 596 for (pos = 0; pos < 4; pos++) { 597 if (!(reg & BIT(pos))) 598 continue; 599 600 vector = offset + (pos << 3); 601 dev_dbg(dev, "irq: bit %d, vector %d\n", pos, vector); 602 generic_handle_domain_irq(pp->irq_domain, vector); 603 } 604 605 chained_irq_exit(chip, desc); 606 } 607 608 /** 609 * ks_pcie_legacy_irq_handler() - Handle legacy interrupt 610 * @desc: Pointer to irq descriptor 611 * 612 * Traverse through pending legacy interrupts and invoke handler for each. Also 613 * takes care of interrupt controller level mask/ack operation. 614 */ 615 static void ks_pcie_legacy_irq_handler(struct irq_desc *desc) 616 { 617 unsigned int irq = irq_desc_get_irq(desc); 618 struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc); 619 struct dw_pcie *pci = ks_pcie->pci; 620 struct device *dev = pci->dev; 621 u32 irq_offset = irq - ks_pcie->legacy_host_irqs[0]; 622 struct irq_chip *chip = irq_desc_get_chip(desc); 623 624 dev_dbg(dev, ": Handling legacy irq %d\n", irq); 625 626 /* 627 * The chained irq handler installation would have replaced normal 628 * interrupt driver handler so we need to take care of mask/unmask and 629 * ack operation. 630 */ 631 chained_irq_enter(chip, desc); 632 ks_pcie_handle_legacy_irq(ks_pcie, irq_offset); 633 chained_irq_exit(chip, desc); 634 } 635 636 static int ks_pcie_config_msi_irq(struct keystone_pcie *ks_pcie) 637 { 638 struct device *dev = ks_pcie->pci->dev; 639 struct device_node *np = ks_pcie->np; 640 struct device_node *intc_np; 641 struct irq_data *irq_data; 642 int irq_count, irq, ret, i; 643 644 if (!IS_ENABLED(CONFIG_PCI_MSI)) 645 return 0; 646 647 intc_np = of_get_child_by_name(np, "msi-interrupt-controller"); 648 if (!intc_np) { 649 if (ks_pcie->is_am6) 650 return 0; 651 dev_warn(dev, "msi-interrupt-controller node is absent\n"); 652 return -EINVAL; 653 } 654 655 irq_count = of_irq_count(intc_np); 656 if (!irq_count) { 657 dev_err(dev, "No IRQ entries in msi-interrupt-controller\n"); 658 ret = -EINVAL; 659 goto err; 660 } 661 662 for (i = 0; i < irq_count; i++) { 663 irq = irq_of_parse_and_map(intc_np, i); 664 if (!irq) { 665 ret = -EINVAL; 666 goto err; 667 } 668 669 if (!ks_pcie->msi_host_irq) { 670 irq_data = irq_get_irq_data(irq); 671 if (!irq_data) { 672 ret = -EINVAL; 673 goto err; 674 } 675 ks_pcie->msi_host_irq = irq_data->hwirq; 676 } 677 678 irq_set_chained_handler_and_data(irq, ks_pcie_msi_irq_handler, 679 ks_pcie); 680 } 681 682 of_node_put(intc_np); 683 return 0; 684 685 err: 686 of_node_put(intc_np); 687 return ret; 688 } 689 690 static int ks_pcie_config_legacy_irq(struct keystone_pcie *ks_pcie) 691 { 692 struct device *dev = ks_pcie->pci->dev; 693 struct irq_domain *legacy_irq_domain; 694 struct device_node *np = ks_pcie->np; 695 struct device_node *intc_np; 696 int irq_count, irq, ret = 0, i; 697 698 intc_np = of_get_child_by_name(np, "legacy-interrupt-controller"); 699 if (!intc_np) { 700 /* 701 * Since legacy interrupts are modeled as edge-interrupts in 702 * AM6, keep it disabled for now. 703 */ 704 if (ks_pcie->is_am6) 705 return 0; 706 dev_warn(dev, "legacy-interrupt-controller node is absent\n"); 707 return -EINVAL; 708 } 709 710 irq_count = of_irq_count(intc_np); 711 if (!irq_count) { 712 dev_err(dev, "No IRQ entries in legacy-interrupt-controller\n"); 713 ret = -EINVAL; 714 goto err; 715 } 716 717 for (i = 0; i < irq_count; i++) { 718 irq = irq_of_parse_and_map(intc_np, i); 719 if (!irq) { 720 ret = -EINVAL; 721 goto err; 722 } 723 ks_pcie->legacy_host_irqs[i] = irq; 724 725 irq_set_chained_handler_and_data(irq, 726 ks_pcie_legacy_irq_handler, 727 ks_pcie); 728 } 729 730 legacy_irq_domain = 731 irq_domain_add_linear(intc_np, PCI_NUM_INTX, 732 &ks_pcie_legacy_irq_domain_ops, NULL); 733 if (!legacy_irq_domain) { 734 dev_err(dev, "Failed to add irq domain for legacy irqs\n"); 735 ret = -EINVAL; 736 goto err; 737 } 738 ks_pcie->legacy_irq_domain = legacy_irq_domain; 739 740 for (i = 0; i < PCI_NUM_INTX; i++) 741 ks_pcie_app_writel(ks_pcie, IRQ_ENABLE_SET(i), INTx_EN); 742 743 err: 744 of_node_put(intc_np); 745 return ret; 746 } 747 748 #ifdef CONFIG_ARM 749 /* 750 * When a PCI device does not exist during config cycles, keystone host 751 * gets a bus error instead of returning 0xffffffff (PCI_ERROR_RESPONSE). 752 * This handler always returns 0 for this kind of fault. 753 */ 754 static int ks_pcie_fault(unsigned long addr, unsigned int fsr, 755 struct pt_regs *regs) 756 { 757 unsigned long instr = *(unsigned long *) instruction_pointer(regs); 758 759 if ((instr & 0x0e100090) == 0x00100090) { 760 int reg = (instr >> 12) & 15; 761 762 regs->uregs[reg] = -1; 763 regs->ARM_pc += 4; 764 } 765 766 return 0; 767 } 768 #endif 769 770 static int __init ks_pcie_init_id(struct keystone_pcie *ks_pcie) 771 { 772 int ret; 773 unsigned int id; 774 struct regmap *devctrl_regs; 775 struct dw_pcie *pci = ks_pcie->pci; 776 struct device *dev = pci->dev; 777 struct device_node *np = dev->of_node; 778 struct of_phandle_args args; 779 unsigned int offset = 0; 780 781 devctrl_regs = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-id"); 782 if (IS_ERR(devctrl_regs)) 783 return PTR_ERR(devctrl_regs); 784 785 /* Do not error out to maintain old DT compatibility */ 786 ret = of_parse_phandle_with_fixed_args(np, "ti,syscon-pcie-id", 1, 0, &args); 787 if (!ret) 788 offset = args.args[0]; 789 790 ret = regmap_read(devctrl_regs, offset, &id); 791 if (ret) 792 return ret; 793 794 dw_pcie_dbi_ro_wr_en(pci); 795 dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, id & PCIE_VENDORID_MASK); 796 dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, id >> PCIE_DEVICEID_SHIFT); 797 dw_pcie_dbi_ro_wr_dis(pci); 798 799 return 0; 800 } 801 802 static int __init ks_pcie_host_init(struct dw_pcie_rp *pp) 803 { 804 struct dw_pcie *pci = to_dw_pcie_from_pp(pp); 805 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci); 806 int ret; 807 808 pp->bridge->ops = &ks_pcie_ops; 809 if (!ks_pcie->is_am6) 810 pp->bridge->child_ops = &ks_child_pcie_ops; 811 812 ret = ks_pcie_config_legacy_irq(ks_pcie); 813 if (ret) 814 return ret; 815 816 ret = ks_pcie_config_msi_irq(ks_pcie); 817 if (ret) 818 return ret; 819 820 ks_pcie_stop_link(pci); 821 ks_pcie_setup_rc_app_regs(ks_pcie); 822 writew(PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8), 823 pci->dbi_base + PCI_IO_BASE); 824 825 ret = ks_pcie_init_id(ks_pcie); 826 if (ret < 0) 827 return ret; 828 829 #ifdef CONFIG_ARM 830 /* 831 * PCIe access errors that result into OCP errors are caught by ARM as 832 * "External aborts" 833 */ 834 hook_fault_code(17, ks_pcie_fault, SIGBUS, 0, 835 "Asynchronous external abort"); 836 #endif 837 838 return 0; 839 } 840 841 static const struct dw_pcie_host_ops ks_pcie_host_ops = { 842 .host_init = ks_pcie_host_init, 843 .msi_host_init = ks_pcie_msi_host_init, 844 }; 845 846 static const struct dw_pcie_host_ops ks_pcie_am654_host_ops = { 847 .host_init = ks_pcie_host_init, 848 }; 849 850 static irqreturn_t ks_pcie_err_irq_handler(int irq, void *priv) 851 { 852 struct keystone_pcie *ks_pcie = priv; 853 854 return ks_pcie_handle_error_irq(ks_pcie); 855 } 856 857 static void ks_pcie_am654_write_dbi2(struct dw_pcie *pci, void __iomem *base, 858 u32 reg, size_t size, u32 val) 859 { 860 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci); 861 862 ks_pcie_set_dbi_mode(ks_pcie); 863 dw_pcie_write(base + reg, size, val); 864 ks_pcie_clear_dbi_mode(ks_pcie); 865 } 866 867 static const struct dw_pcie_ops ks_pcie_dw_pcie_ops = { 868 .start_link = ks_pcie_start_link, 869 .stop_link = ks_pcie_stop_link, 870 .link_up = ks_pcie_link_up, 871 .write_dbi2 = ks_pcie_am654_write_dbi2, 872 }; 873 874 static void ks_pcie_am654_ep_init(struct dw_pcie_ep *ep) 875 { 876 struct dw_pcie *pci = to_dw_pcie_from_ep(ep); 877 int flags; 878 879 ep->page_size = AM654_WIN_SIZE; 880 flags = PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_32; 881 dw_pcie_writel_dbi2(pci, PCI_BASE_ADDRESS_0, APP_ADDR_SPACE_0 - 1); 882 dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_0, flags); 883 } 884 885 static void ks_pcie_am654_raise_legacy_irq(struct keystone_pcie *ks_pcie) 886 { 887 struct dw_pcie *pci = ks_pcie->pci; 888 u8 int_pin; 889 890 int_pin = dw_pcie_readb_dbi(pci, PCI_INTERRUPT_PIN); 891 if (int_pin == 0 || int_pin > 4) 892 return; 893 894 ks_pcie_app_writel(ks_pcie, PCIE_LEGACY_IRQ_ENABLE_SET(int_pin), 895 INT_ENABLE); 896 ks_pcie_app_writel(ks_pcie, PCIE_EP_IRQ_SET, INT_ENABLE); 897 mdelay(1); 898 ks_pcie_app_writel(ks_pcie, PCIE_EP_IRQ_CLR, INT_ENABLE); 899 ks_pcie_app_writel(ks_pcie, PCIE_LEGACY_IRQ_ENABLE_CLR(int_pin), 900 INT_ENABLE); 901 } 902 903 static int ks_pcie_am654_raise_irq(struct dw_pcie_ep *ep, u8 func_no, 904 enum pci_epc_irq_type type, 905 u16 interrupt_num) 906 { 907 struct dw_pcie *pci = to_dw_pcie_from_ep(ep); 908 struct keystone_pcie *ks_pcie = to_keystone_pcie(pci); 909 910 switch (type) { 911 case PCI_EPC_IRQ_LEGACY: 912 ks_pcie_am654_raise_legacy_irq(ks_pcie); 913 break; 914 case PCI_EPC_IRQ_MSI: 915 dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num); 916 break; 917 case PCI_EPC_IRQ_MSIX: 918 dw_pcie_ep_raise_msix_irq(ep, func_no, interrupt_num); 919 break; 920 default: 921 dev_err(pci->dev, "UNKNOWN IRQ type\n"); 922 return -EINVAL; 923 } 924 925 return 0; 926 } 927 928 static const struct pci_epc_features ks_pcie_am654_epc_features = { 929 .linkup_notifier = false, 930 .msi_capable = true, 931 .msix_capable = true, 932 .reserved_bar = 1 << BAR_0 | 1 << BAR_1, 933 .bar_fixed_64bit = 1 << BAR_0, 934 .bar_fixed_size[2] = SZ_1M, 935 .bar_fixed_size[3] = SZ_64K, 936 .bar_fixed_size[4] = 256, 937 .bar_fixed_size[5] = SZ_1M, 938 .align = SZ_1M, 939 }; 940 941 static const struct pci_epc_features* 942 ks_pcie_am654_get_features(struct dw_pcie_ep *ep) 943 { 944 return &ks_pcie_am654_epc_features; 945 } 946 947 static const struct dw_pcie_ep_ops ks_pcie_am654_ep_ops = { 948 .ep_init = ks_pcie_am654_ep_init, 949 .raise_irq = ks_pcie_am654_raise_irq, 950 .get_features = &ks_pcie_am654_get_features, 951 }; 952 953 static void ks_pcie_disable_phy(struct keystone_pcie *ks_pcie) 954 { 955 int num_lanes = ks_pcie->num_lanes; 956 957 while (num_lanes--) { 958 phy_power_off(ks_pcie->phy[num_lanes]); 959 phy_exit(ks_pcie->phy[num_lanes]); 960 } 961 } 962 963 static int ks_pcie_enable_phy(struct keystone_pcie *ks_pcie) 964 { 965 int i; 966 int ret; 967 int num_lanes = ks_pcie->num_lanes; 968 969 for (i = 0; i < num_lanes; i++) { 970 ret = phy_reset(ks_pcie->phy[i]); 971 if (ret < 0) 972 goto err_phy; 973 974 ret = phy_init(ks_pcie->phy[i]); 975 if (ret < 0) 976 goto err_phy; 977 978 ret = phy_power_on(ks_pcie->phy[i]); 979 if (ret < 0) { 980 phy_exit(ks_pcie->phy[i]); 981 goto err_phy; 982 } 983 } 984 985 return 0; 986 987 err_phy: 988 while (--i >= 0) { 989 phy_power_off(ks_pcie->phy[i]); 990 phy_exit(ks_pcie->phy[i]); 991 } 992 993 return ret; 994 } 995 996 static int ks_pcie_set_mode(struct device *dev) 997 { 998 struct device_node *np = dev->of_node; 999 struct of_phandle_args args; 1000 unsigned int offset = 0; 1001 struct regmap *syscon; 1002 u32 val; 1003 u32 mask; 1004 int ret = 0; 1005 1006 syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-mode"); 1007 if (IS_ERR(syscon)) 1008 return 0; 1009 1010 /* Do not error out to maintain old DT compatibility */ 1011 ret = of_parse_phandle_with_fixed_args(np, "ti,syscon-pcie-mode", 1, 0, &args); 1012 if (!ret) 1013 offset = args.args[0]; 1014 1015 mask = KS_PCIE_DEV_TYPE_MASK | KS_PCIE_SYSCLOCKOUTEN; 1016 val = KS_PCIE_DEV_TYPE(RC) | KS_PCIE_SYSCLOCKOUTEN; 1017 1018 ret = regmap_update_bits(syscon, offset, mask, val); 1019 if (ret) { 1020 dev_err(dev, "failed to set pcie mode\n"); 1021 return ret; 1022 } 1023 1024 return 0; 1025 } 1026 1027 static int ks_pcie_am654_set_mode(struct device *dev, 1028 enum dw_pcie_device_mode mode) 1029 { 1030 struct device_node *np = dev->of_node; 1031 struct of_phandle_args args; 1032 unsigned int offset = 0; 1033 struct regmap *syscon; 1034 u32 val; 1035 u32 mask; 1036 int ret = 0; 1037 1038 syscon = syscon_regmap_lookup_by_phandle(np, "ti,syscon-pcie-mode"); 1039 if (IS_ERR(syscon)) 1040 return 0; 1041 1042 /* Do not error out to maintain old DT compatibility */ 1043 ret = of_parse_phandle_with_fixed_args(np, "ti,syscon-pcie-mode", 1, 0, &args); 1044 if (!ret) 1045 offset = args.args[0]; 1046 1047 mask = AM654_PCIE_DEV_TYPE_MASK; 1048 1049 switch (mode) { 1050 case DW_PCIE_RC_TYPE: 1051 val = RC; 1052 break; 1053 case DW_PCIE_EP_TYPE: 1054 val = EP; 1055 break; 1056 default: 1057 dev_err(dev, "INVALID device type %d\n", mode); 1058 return -EINVAL; 1059 } 1060 1061 ret = regmap_update_bits(syscon, offset, mask, val); 1062 if (ret) { 1063 dev_err(dev, "failed to set pcie mode\n"); 1064 return ret; 1065 } 1066 1067 return 0; 1068 } 1069 1070 static const struct ks_pcie_of_data ks_pcie_rc_of_data = { 1071 .host_ops = &ks_pcie_host_ops, 1072 .version = DW_PCIE_VER_365A, 1073 }; 1074 1075 static const struct ks_pcie_of_data ks_pcie_am654_rc_of_data = { 1076 .host_ops = &ks_pcie_am654_host_ops, 1077 .mode = DW_PCIE_RC_TYPE, 1078 .version = DW_PCIE_VER_490A, 1079 }; 1080 1081 static const struct ks_pcie_of_data ks_pcie_am654_ep_of_data = { 1082 .ep_ops = &ks_pcie_am654_ep_ops, 1083 .mode = DW_PCIE_EP_TYPE, 1084 .version = DW_PCIE_VER_490A, 1085 }; 1086 1087 static const struct of_device_id ks_pcie_of_match[] = { 1088 { 1089 .type = "pci", 1090 .data = &ks_pcie_rc_of_data, 1091 .compatible = "ti,keystone-pcie", 1092 }, 1093 { 1094 .data = &ks_pcie_am654_rc_of_data, 1095 .compatible = "ti,am654-pcie-rc", 1096 }, 1097 { 1098 .data = &ks_pcie_am654_ep_of_data, 1099 .compatible = "ti,am654-pcie-ep", 1100 }, 1101 { }, 1102 }; 1103 1104 static int __init ks_pcie_probe(struct platform_device *pdev) 1105 { 1106 const struct dw_pcie_host_ops *host_ops; 1107 const struct dw_pcie_ep_ops *ep_ops; 1108 struct device *dev = &pdev->dev; 1109 struct device_node *np = dev->of_node; 1110 const struct ks_pcie_of_data *data; 1111 enum dw_pcie_device_mode mode; 1112 struct dw_pcie *pci; 1113 struct keystone_pcie *ks_pcie; 1114 struct device_link **link; 1115 struct gpio_desc *gpiod; 1116 struct resource *res; 1117 void __iomem *base; 1118 u32 num_viewport; 1119 struct phy **phy; 1120 u32 num_lanes; 1121 char name[10]; 1122 u32 version; 1123 int ret; 1124 int irq; 1125 int i; 1126 1127 data = of_device_get_match_data(dev); 1128 if (!data) 1129 return -EINVAL; 1130 1131 version = data->version; 1132 host_ops = data->host_ops; 1133 ep_ops = data->ep_ops; 1134 mode = data->mode; 1135 1136 ks_pcie = devm_kzalloc(dev, sizeof(*ks_pcie), GFP_KERNEL); 1137 if (!ks_pcie) 1138 return -ENOMEM; 1139 1140 pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); 1141 if (!pci) 1142 return -ENOMEM; 1143 1144 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "app"); 1145 ks_pcie->va_app_base = devm_ioremap_resource(dev, res); 1146 if (IS_ERR(ks_pcie->va_app_base)) 1147 return PTR_ERR(ks_pcie->va_app_base); 1148 1149 ks_pcie->app = *res; 1150 1151 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbics"); 1152 base = devm_pci_remap_cfg_resource(dev, res); 1153 if (IS_ERR(base)) 1154 return PTR_ERR(base); 1155 1156 if (of_device_is_compatible(np, "ti,am654-pcie-rc")) 1157 ks_pcie->is_am6 = true; 1158 1159 pci->dbi_base = base; 1160 pci->dbi_base2 = base; 1161 pci->dev = dev; 1162 pci->ops = &ks_pcie_dw_pcie_ops; 1163 pci->version = version; 1164 1165 irq = platform_get_irq(pdev, 0); 1166 if (irq < 0) 1167 return irq; 1168 1169 ret = request_irq(irq, ks_pcie_err_irq_handler, IRQF_SHARED, 1170 "ks-pcie-error-irq", ks_pcie); 1171 if (ret < 0) { 1172 dev_err(dev, "failed to request error IRQ %d\n", 1173 irq); 1174 return ret; 1175 } 1176 1177 ret = of_property_read_u32(np, "num-lanes", &num_lanes); 1178 if (ret) 1179 num_lanes = 1; 1180 1181 phy = devm_kzalloc(dev, sizeof(*phy) * num_lanes, GFP_KERNEL); 1182 if (!phy) 1183 return -ENOMEM; 1184 1185 link = devm_kzalloc(dev, sizeof(*link) * num_lanes, GFP_KERNEL); 1186 if (!link) 1187 return -ENOMEM; 1188 1189 for (i = 0; i < num_lanes; i++) { 1190 snprintf(name, sizeof(name), "pcie-phy%d", i); 1191 phy[i] = devm_phy_optional_get(dev, name); 1192 if (IS_ERR(phy[i])) { 1193 ret = PTR_ERR(phy[i]); 1194 goto err_link; 1195 } 1196 1197 if (!phy[i]) 1198 continue; 1199 1200 link[i] = device_link_add(dev, &phy[i]->dev, DL_FLAG_STATELESS); 1201 if (!link[i]) { 1202 ret = -EINVAL; 1203 goto err_link; 1204 } 1205 } 1206 1207 ks_pcie->np = np; 1208 ks_pcie->pci = pci; 1209 ks_pcie->link = link; 1210 ks_pcie->num_lanes = num_lanes; 1211 ks_pcie->phy = phy; 1212 1213 gpiod = devm_gpiod_get_optional(dev, "reset", 1214 GPIOD_OUT_LOW); 1215 if (IS_ERR(gpiod)) { 1216 ret = PTR_ERR(gpiod); 1217 if (ret != -EPROBE_DEFER) 1218 dev_err(dev, "Failed to get reset GPIO\n"); 1219 goto err_link; 1220 } 1221 1222 ret = ks_pcie_enable_phy(ks_pcie); 1223 if (ret) { 1224 dev_err(dev, "failed to enable phy\n"); 1225 goto err_link; 1226 } 1227 1228 platform_set_drvdata(pdev, ks_pcie); 1229 pm_runtime_enable(dev); 1230 ret = pm_runtime_get_sync(dev); 1231 if (ret < 0) { 1232 dev_err(dev, "pm_runtime_get_sync failed\n"); 1233 goto err_get_sync; 1234 } 1235 1236 if (dw_pcie_ver_is_ge(pci, 480A)) 1237 ret = ks_pcie_am654_set_mode(dev, mode); 1238 else 1239 ret = ks_pcie_set_mode(dev); 1240 if (ret < 0) 1241 goto err_get_sync; 1242 1243 switch (mode) { 1244 case DW_PCIE_RC_TYPE: 1245 if (!IS_ENABLED(CONFIG_PCI_KEYSTONE_HOST)) { 1246 ret = -ENODEV; 1247 goto err_get_sync; 1248 } 1249 1250 ret = of_property_read_u32(np, "num-viewport", &num_viewport); 1251 if (ret < 0) { 1252 dev_err(dev, "unable to read *num-viewport* property\n"); 1253 goto err_get_sync; 1254 } 1255 1256 /* 1257 * "Power Sequencing and Reset Signal Timings" table in 1258 * PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 2.0 1259 * indicates PERST# should be deasserted after minimum of 100us 1260 * once REFCLK is stable. The REFCLK to the connector in RC 1261 * mode is selected while enabling the PHY. So deassert PERST# 1262 * after 100 us. 1263 */ 1264 if (gpiod) { 1265 usleep_range(100, 200); 1266 gpiod_set_value_cansleep(gpiod, 1); 1267 } 1268 1269 ks_pcie->num_viewport = num_viewport; 1270 pci->pp.ops = host_ops; 1271 ret = dw_pcie_host_init(&pci->pp); 1272 if (ret < 0) 1273 goto err_get_sync; 1274 break; 1275 case DW_PCIE_EP_TYPE: 1276 if (!IS_ENABLED(CONFIG_PCI_KEYSTONE_EP)) { 1277 ret = -ENODEV; 1278 goto err_get_sync; 1279 } 1280 1281 pci->ep.ops = ep_ops; 1282 ret = dw_pcie_ep_init(&pci->ep); 1283 if (ret < 0) 1284 goto err_get_sync; 1285 break; 1286 default: 1287 dev_err(dev, "INVALID device type %d\n", mode); 1288 } 1289 1290 ks_pcie_enable_error_irq(ks_pcie); 1291 1292 return 0; 1293 1294 err_get_sync: 1295 pm_runtime_put(dev); 1296 pm_runtime_disable(dev); 1297 ks_pcie_disable_phy(ks_pcie); 1298 1299 err_link: 1300 while (--i >= 0 && link[i]) 1301 device_link_del(link[i]); 1302 1303 return ret; 1304 } 1305 1306 static int __exit ks_pcie_remove(struct platform_device *pdev) 1307 { 1308 struct keystone_pcie *ks_pcie = platform_get_drvdata(pdev); 1309 struct device_link **link = ks_pcie->link; 1310 int num_lanes = ks_pcie->num_lanes; 1311 struct device *dev = &pdev->dev; 1312 1313 pm_runtime_put(dev); 1314 pm_runtime_disable(dev); 1315 ks_pcie_disable_phy(ks_pcie); 1316 while (num_lanes--) 1317 device_link_del(link[num_lanes]); 1318 1319 return 0; 1320 } 1321 1322 static struct platform_driver ks_pcie_driver __refdata = { 1323 .probe = ks_pcie_probe, 1324 .remove = __exit_p(ks_pcie_remove), 1325 .driver = { 1326 .name = "keystone-pcie", 1327 .of_match_table = ks_pcie_of_match, 1328 }, 1329 }; 1330 builtin_platform_driver(ks_pcie_driver); 1331