1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * PCIe host controller driver for NWL PCIe Bridge 4 * Based on pcie-xilinx.c, pci-tegra.c 5 * 6 * (C) Copyright 2014 - 2015, Xilinx, Inc. 7 */ 8 9 #include <linux/clk.h> 10 #include <linux/delay.h> 11 #include <linux/interrupt.h> 12 #include <linux/irq.h> 13 #include <linux/irqdomain.h> 14 #include <linux/kernel.h> 15 #include <linux/init.h> 16 #include <linux/msi.h> 17 #include <linux/of_address.h> 18 #include <linux/of_pci.h> 19 #include <linux/of_platform.h> 20 #include <linux/pci.h> 21 #include <linux/pci-ecam.h> 22 #include <linux/platform_device.h> 23 #include <linux/irqchip/chained_irq.h> 24 25 #include "../pci.h" 26 27 /* Bridge core config registers */ 28 #define BRCFG_PCIE_RX0 0x00000000 29 #define BRCFG_PCIE_RX1 0x00000004 30 #define BRCFG_INTERRUPT 0x00000010 31 #define BRCFG_PCIE_RX_MSG_FILTER 0x00000020 32 33 /* Egress - Bridge translation registers */ 34 #define E_BREG_CAPABILITIES 0x00000200 35 #define E_BREG_CONTROL 0x00000208 36 #define E_BREG_BASE_LO 0x00000210 37 #define E_BREG_BASE_HI 0x00000214 38 #define E_ECAM_CAPABILITIES 0x00000220 39 #define E_ECAM_CONTROL 0x00000228 40 #define E_ECAM_BASE_LO 0x00000230 41 #define E_ECAM_BASE_HI 0x00000234 42 43 /* Ingress - address translations */ 44 #define I_MSII_CAPABILITIES 0x00000300 45 #define I_MSII_CONTROL 0x00000308 46 #define I_MSII_BASE_LO 0x00000310 47 #define I_MSII_BASE_HI 0x00000314 48 49 #define I_ISUB_CONTROL 0x000003E8 50 #define SET_ISUB_CONTROL BIT(0) 51 /* Rxed msg fifo - Interrupt status registers */ 52 #define MSGF_MISC_STATUS 0x00000400 53 #define MSGF_MISC_MASK 0x00000404 54 #define MSGF_LEG_STATUS 0x00000420 55 #define MSGF_LEG_MASK 0x00000424 56 #define MSGF_MSI_STATUS_LO 0x00000440 57 #define MSGF_MSI_STATUS_HI 0x00000444 58 #define MSGF_MSI_MASK_LO 0x00000448 59 #define MSGF_MSI_MASK_HI 0x0000044C 60 61 /* Msg filter mask bits */ 62 #define CFG_ENABLE_PM_MSG_FWD BIT(1) 63 #define CFG_ENABLE_INT_MSG_FWD BIT(2) 64 #define CFG_ENABLE_ERR_MSG_FWD BIT(3) 65 #define CFG_ENABLE_MSG_FILTER_MASK (CFG_ENABLE_PM_MSG_FWD | \ 66 CFG_ENABLE_INT_MSG_FWD | \ 67 CFG_ENABLE_ERR_MSG_FWD) 68 69 /* Misc interrupt status mask bits */ 70 #define MSGF_MISC_SR_RXMSG_AVAIL BIT(0) 71 #define MSGF_MISC_SR_RXMSG_OVER BIT(1) 72 #define MSGF_MISC_SR_SLAVE_ERR BIT(4) 73 #define MSGF_MISC_SR_MASTER_ERR BIT(5) 74 #define MSGF_MISC_SR_I_ADDR_ERR BIT(6) 75 #define MSGF_MISC_SR_E_ADDR_ERR BIT(7) 76 #define MSGF_MISC_SR_FATAL_AER BIT(16) 77 #define MSGF_MISC_SR_NON_FATAL_AER BIT(17) 78 #define MSGF_MISC_SR_CORR_AER BIT(18) 79 #define MSGF_MISC_SR_UR_DETECT BIT(20) 80 #define MSGF_MISC_SR_NON_FATAL_DEV BIT(22) 81 #define MSGF_MISC_SR_FATAL_DEV BIT(23) 82 #define MSGF_MISC_SR_LINK_DOWN BIT(24) 83 #define MSGF_MISC_SR_LINK_AUTO_BWIDTH BIT(25) 84 #define MSGF_MISC_SR_LINK_BWIDTH BIT(26) 85 86 #define MSGF_MISC_SR_MASKALL (MSGF_MISC_SR_RXMSG_AVAIL | \ 87 MSGF_MISC_SR_RXMSG_OVER | \ 88 MSGF_MISC_SR_SLAVE_ERR | \ 89 MSGF_MISC_SR_MASTER_ERR | \ 90 MSGF_MISC_SR_I_ADDR_ERR | \ 91 MSGF_MISC_SR_E_ADDR_ERR | \ 92 MSGF_MISC_SR_FATAL_AER | \ 93 MSGF_MISC_SR_NON_FATAL_AER | \ 94 MSGF_MISC_SR_CORR_AER | \ 95 MSGF_MISC_SR_UR_DETECT | \ 96 MSGF_MISC_SR_NON_FATAL_DEV | \ 97 MSGF_MISC_SR_FATAL_DEV | \ 98 MSGF_MISC_SR_LINK_DOWN | \ 99 MSGF_MISC_SR_LINK_AUTO_BWIDTH | \ 100 MSGF_MISC_SR_LINK_BWIDTH) 101 102 /* Legacy interrupt status mask bits */ 103 #define MSGF_LEG_SR_INTA BIT(0) 104 #define MSGF_LEG_SR_INTB BIT(1) 105 #define MSGF_LEG_SR_INTC BIT(2) 106 #define MSGF_LEG_SR_INTD BIT(3) 107 #define MSGF_LEG_SR_MASKALL (MSGF_LEG_SR_INTA | MSGF_LEG_SR_INTB | \ 108 MSGF_LEG_SR_INTC | MSGF_LEG_SR_INTD) 109 110 /* MSI interrupt status mask bits */ 111 #define MSGF_MSI_SR_LO_MASK GENMASK(31, 0) 112 #define MSGF_MSI_SR_HI_MASK GENMASK(31, 0) 113 114 #define MSII_PRESENT BIT(0) 115 #define MSII_ENABLE BIT(0) 116 #define MSII_STATUS_ENABLE BIT(15) 117 118 /* Bridge config interrupt mask */ 119 #define BRCFG_INTERRUPT_MASK BIT(0) 120 #define BREG_PRESENT BIT(0) 121 #define BREG_ENABLE BIT(0) 122 #define BREG_ENABLE_FORCE BIT(1) 123 124 /* E_ECAM status mask bits */ 125 #define E_ECAM_PRESENT BIT(0) 126 #define E_ECAM_CR_ENABLE BIT(0) 127 #define E_ECAM_SIZE_LOC GENMASK(20, 16) 128 #define E_ECAM_SIZE_SHIFT 16 129 #define NWL_ECAM_VALUE_DEFAULT 12 130 131 #define CFG_DMA_REG_BAR GENMASK(2, 0) 132 #define CFG_PCIE_CACHE GENMASK(7, 0) 133 134 #define INT_PCI_MSI_NR (2 * 32) 135 136 /* Readin the PS_LINKUP */ 137 #define PS_LINKUP_OFFSET 0x00000238 138 #define PCIE_PHY_LINKUP_BIT BIT(0) 139 #define PHY_RDY_LINKUP_BIT BIT(1) 140 141 /* Parameters for the waiting for link up routine */ 142 #define LINK_WAIT_MAX_RETRIES 10 143 #define LINK_WAIT_USLEEP_MIN 90000 144 #define LINK_WAIT_USLEEP_MAX 100000 145 146 struct nwl_msi { /* MSI information */ 147 struct irq_domain *msi_domain; 148 DECLARE_BITMAP(bitmap, INT_PCI_MSI_NR); 149 struct irq_domain *dev_domain; 150 struct mutex lock; /* protect bitmap variable */ 151 int irq_msi0; 152 int irq_msi1; 153 }; 154 155 struct nwl_pcie { 156 struct device *dev; 157 void __iomem *breg_base; 158 void __iomem *pcireg_base; 159 void __iomem *ecam_base; 160 phys_addr_t phys_breg_base; /* Physical Bridge Register Base */ 161 phys_addr_t phys_pcie_reg_base; /* Physical PCIe Controller Base */ 162 phys_addr_t phys_ecam_base; /* Physical Configuration Base */ 163 u32 breg_size; 164 u32 pcie_reg_size; 165 u32 ecam_size; 166 int irq_intx; 167 int irq_misc; 168 u32 ecam_value; 169 u8 last_busno; 170 struct nwl_msi msi; 171 struct irq_domain *legacy_irq_domain; 172 struct clk *clk; 173 raw_spinlock_t leg_mask_lock; 174 }; 175 176 static inline u32 nwl_bridge_readl(struct nwl_pcie *pcie, u32 off) 177 { 178 return readl(pcie->breg_base + off); 179 } 180 181 static inline void nwl_bridge_writel(struct nwl_pcie *pcie, u32 val, u32 off) 182 { 183 writel(val, pcie->breg_base + off); 184 } 185 186 static bool nwl_pcie_link_up(struct nwl_pcie *pcie) 187 { 188 if (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & PCIE_PHY_LINKUP_BIT) 189 return true; 190 return false; 191 } 192 193 static bool nwl_phy_link_up(struct nwl_pcie *pcie) 194 { 195 if (readl(pcie->pcireg_base + PS_LINKUP_OFFSET) & PHY_RDY_LINKUP_BIT) 196 return true; 197 return false; 198 } 199 200 static int nwl_wait_for_link(struct nwl_pcie *pcie) 201 { 202 struct device *dev = pcie->dev; 203 int retries; 204 205 /* check if the link is up or not */ 206 for (retries = 0; retries < LINK_WAIT_MAX_RETRIES; retries++) { 207 if (nwl_phy_link_up(pcie)) 208 return 0; 209 usleep_range(LINK_WAIT_USLEEP_MIN, LINK_WAIT_USLEEP_MAX); 210 } 211 212 dev_err(dev, "PHY link never came up\n"); 213 return -ETIMEDOUT; 214 } 215 216 static bool nwl_pcie_valid_device(struct pci_bus *bus, unsigned int devfn) 217 { 218 struct nwl_pcie *pcie = bus->sysdata; 219 220 /* Check link before accessing downstream ports */ 221 if (!pci_is_root_bus(bus)) { 222 if (!nwl_pcie_link_up(pcie)) 223 return false; 224 } else if (devfn > 0) 225 /* Only one device down on each root port */ 226 return false; 227 228 return true; 229 } 230 231 /** 232 * nwl_pcie_map_bus - Get configuration base 233 * 234 * @bus: Bus structure of current bus 235 * @devfn: Device/function 236 * @where: Offset from base 237 * 238 * Return: Base address of the configuration space needed to be 239 * accessed. 240 */ 241 static void __iomem *nwl_pcie_map_bus(struct pci_bus *bus, unsigned int devfn, 242 int where) 243 { 244 struct nwl_pcie *pcie = bus->sysdata; 245 246 if (!nwl_pcie_valid_device(bus, devfn)) 247 return NULL; 248 249 return pcie->ecam_base + PCIE_ECAM_OFFSET(bus->number, devfn, where); 250 } 251 252 /* PCIe operations */ 253 static struct pci_ops nwl_pcie_ops = { 254 .map_bus = nwl_pcie_map_bus, 255 .read = pci_generic_config_read, 256 .write = pci_generic_config_write, 257 }; 258 259 static irqreturn_t nwl_pcie_misc_handler(int irq, void *data) 260 { 261 struct nwl_pcie *pcie = data; 262 struct device *dev = pcie->dev; 263 u32 misc_stat; 264 265 /* Checking for misc interrupts */ 266 misc_stat = nwl_bridge_readl(pcie, MSGF_MISC_STATUS) & 267 MSGF_MISC_SR_MASKALL; 268 if (!misc_stat) 269 return IRQ_NONE; 270 271 if (misc_stat & MSGF_MISC_SR_RXMSG_OVER) 272 dev_err(dev, "Received Message FIFO Overflow\n"); 273 274 if (misc_stat & MSGF_MISC_SR_SLAVE_ERR) 275 dev_err(dev, "Slave error\n"); 276 277 if (misc_stat & MSGF_MISC_SR_MASTER_ERR) 278 dev_err(dev, "Master error\n"); 279 280 if (misc_stat & MSGF_MISC_SR_I_ADDR_ERR) 281 dev_err(dev, "In Misc Ingress address translation error\n"); 282 283 if (misc_stat & MSGF_MISC_SR_E_ADDR_ERR) 284 dev_err(dev, "In Misc Egress address translation error\n"); 285 286 if (misc_stat & MSGF_MISC_SR_FATAL_AER) 287 dev_err(dev, "Fatal Error in AER Capability\n"); 288 289 if (misc_stat & MSGF_MISC_SR_NON_FATAL_AER) 290 dev_err(dev, "Non-Fatal Error in AER Capability\n"); 291 292 if (misc_stat & MSGF_MISC_SR_CORR_AER) 293 dev_err(dev, "Correctable Error in AER Capability\n"); 294 295 if (misc_stat & MSGF_MISC_SR_UR_DETECT) 296 dev_err(dev, "Unsupported request Detected\n"); 297 298 if (misc_stat & MSGF_MISC_SR_NON_FATAL_DEV) 299 dev_err(dev, "Non-Fatal Error Detected\n"); 300 301 if (misc_stat & MSGF_MISC_SR_FATAL_DEV) 302 dev_err(dev, "Fatal Error Detected\n"); 303 304 if (misc_stat & MSGF_MISC_SR_LINK_AUTO_BWIDTH) 305 dev_info(dev, "Link Autonomous Bandwidth Management Status bit set\n"); 306 307 if (misc_stat & MSGF_MISC_SR_LINK_BWIDTH) 308 dev_info(dev, "Link Bandwidth Management Status bit set\n"); 309 310 /* Clear misc interrupt status */ 311 nwl_bridge_writel(pcie, misc_stat, MSGF_MISC_STATUS); 312 313 return IRQ_HANDLED; 314 } 315 316 static void nwl_pcie_leg_handler(struct irq_desc *desc) 317 { 318 struct irq_chip *chip = irq_desc_get_chip(desc); 319 struct nwl_pcie *pcie; 320 unsigned long status; 321 u32 bit; 322 323 chained_irq_enter(chip, desc); 324 pcie = irq_desc_get_handler_data(desc); 325 326 while ((status = nwl_bridge_readl(pcie, MSGF_LEG_STATUS) & 327 MSGF_LEG_SR_MASKALL) != 0) { 328 for_each_set_bit(bit, &status, PCI_NUM_INTX) 329 generic_handle_domain_irq(pcie->legacy_irq_domain, bit); 330 } 331 332 chained_irq_exit(chip, desc); 333 } 334 335 static void nwl_pcie_handle_msi_irq(struct nwl_pcie *pcie, u32 status_reg) 336 { 337 struct nwl_msi *msi = &pcie->msi; 338 unsigned long status; 339 u32 bit; 340 341 while ((status = nwl_bridge_readl(pcie, status_reg)) != 0) { 342 for_each_set_bit(bit, &status, 32) { 343 nwl_bridge_writel(pcie, 1 << bit, status_reg); 344 generic_handle_domain_irq(msi->dev_domain, bit); 345 } 346 } 347 } 348 349 static void nwl_pcie_msi_handler_high(struct irq_desc *desc) 350 { 351 struct irq_chip *chip = irq_desc_get_chip(desc); 352 struct nwl_pcie *pcie = irq_desc_get_handler_data(desc); 353 354 chained_irq_enter(chip, desc); 355 nwl_pcie_handle_msi_irq(pcie, MSGF_MSI_STATUS_HI); 356 chained_irq_exit(chip, desc); 357 } 358 359 static void nwl_pcie_msi_handler_low(struct irq_desc *desc) 360 { 361 struct irq_chip *chip = irq_desc_get_chip(desc); 362 struct nwl_pcie *pcie = irq_desc_get_handler_data(desc); 363 364 chained_irq_enter(chip, desc); 365 nwl_pcie_handle_msi_irq(pcie, MSGF_MSI_STATUS_LO); 366 chained_irq_exit(chip, desc); 367 } 368 369 static void nwl_mask_leg_irq(struct irq_data *data) 370 { 371 struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data); 372 unsigned long flags; 373 u32 mask; 374 u32 val; 375 376 mask = 1 << data->hwirq; 377 raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags); 378 val = nwl_bridge_readl(pcie, MSGF_LEG_MASK); 379 nwl_bridge_writel(pcie, (val & (~mask)), MSGF_LEG_MASK); 380 raw_spin_unlock_irqrestore(&pcie->leg_mask_lock, flags); 381 } 382 383 static void nwl_unmask_leg_irq(struct irq_data *data) 384 { 385 struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data); 386 unsigned long flags; 387 u32 mask; 388 u32 val; 389 390 mask = 1 << data->hwirq; 391 raw_spin_lock_irqsave(&pcie->leg_mask_lock, flags); 392 val = nwl_bridge_readl(pcie, MSGF_LEG_MASK); 393 nwl_bridge_writel(pcie, (val | mask), MSGF_LEG_MASK); 394 raw_spin_unlock_irqrestore(&pcie->leg_mask_lock, flags); 395 } 396 397 static struct irq_chip nwl_leg_irq_chip = { 398 .name = "nwl_pcie:legacy", 399 .irq_enable = nwl_unmask_leg_irq, 400 .irq_disable = nwl_mask_leg_irq, 401 .irq_mask = nwl_mask_leg_irq, 402 .irq_unmask = nwl_unmask_leg_irq, 403 }; 404 405 static int nwl_legacy_map(struct irq_domain *domain, unsigned int irq, 406 irq_hw_number_t hwirq) 407 { 408 irq_set_chip_and_handler(irq, &nwl_leg_irq_chip, handle_level_irq); 409 irq_set_chip_data(irq, domain->host_data); 410 irq_set_status_flags(irq, IRQ_LEVEL); 411 412 return 0; 413 } 414 415 static const struct irq_domain_ops legacy_domain_ops = { 416 .map = nwl_legacy_map, 417 .xlate = pci_irqd_intx_xlate, 418 }; 419 420 #ifdef CONFIG_PCI_MSI 421 static struct irq_chip nwl_msi_irq_chip = { 422 .name = "nwl_pcie:msi", 423 .irq_enable = pci_msi_unmask_irq, 424 .irq_disable = pci_msi_mask_irq, 425 .irq_mask = pci_msi_mask_irq, 426 .irq_unmask = pci_msi_unmask_irq, 427 }; 428 429 static struct msi_domain_info nwl_msi_domain_info = { 430 .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | 431 MSI_FLAG_MULTI_PCI_MSI), 432 .chip = &nwl_msi_irq_chip, 433 }; 434 #endif 435 436 static void nwl_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) 437 { 438 struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data); 439 phys_addr_t msi_addr = pcie->phys_pcie_reg_base; 440 441 msg->address_lo = lower_32_bits(msi_addr); 442 msg->address_hi = upper_32_bits(msi_addr); 443 msg->data = data->hwirq; 444 } 445 446 static int nwl_msi_set_affinity(struct irq_data *irq_data, 447 const struct cpumask *mask, bool force) 448 { 449 return -EINVAL; 450 } 451 452 static struct irq_chip nwl_irq_chip = { 453 .name = "Xilinx MSI", 454 .irq_compose_msi_msg = nwl_compose_msi_msg, 455 .irq_set_affinity = nwl_msi_set_affinity, 456 }; 457 458 static int nwl_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, 459 unsigned int nr_irqs, void *args) 460 { 461 struct nwl_pcie *pcie = domain->host_data; 462 struct nwl_msi *msi = &pcie->msi; 463 int bit; 464 int i; 465 466 mutex_lock(&msi->lock); 467 bit = bitmap_find_free_region(msi->bitmap, INT_PCI_MSI_NR, 468 get_count_order(nr_irqs)); 469 if (bit < 0) { 470 mutex_unlock(&msi->lock); 471 return -ENOSPC; 472 } 473 474 for (i = 0; i < nr_irqs; i++) { 475 irq_domain_set_info(domain, virq + i, bit + i, &nwl_irq_chip, 476 domain->host_data, handle_simple_irq, 477 NULL, NULL); 478 } 479 mutex_unlock(&msi->lock); 480 return 0; 481 } 482 483 static void nwl_irq_domain_free(struct irq_domain *domain, unsigned int virq, 484 unsigned int nr_irqs) 485 { 486 struct irq_data *data = irq_domain_get_irq_data(domain, virq); 487 struct nwl_pcie *pcie = irq_data_get_irq_chip_data(data); 488 struct nwl_msi *msi = &pcie->msi; 489 490 mutex_lock(&msi->lock); 491 bitmap_release_region(msi->bitmap, data->hwirq, 492 get_count_order(nr_irqs)); 493 mutex_unlock(&msi->lock); 494 } 495 496 static const struct irq_domain_ops dev_msi_domain_ops = { 497 .alloc = nwl_irq_domain_alloc, 498 .free = nwl_irq_domain_free, 499 }; 500 501 static int nwl_pcie_init_msi_irq_domain(struct nwl_pcie *pcie) 502 { 503 #ifdef CONFIG_PCI_MSI 504 struct device *dev = pcie->dev; 505 struct fwnode_handle *fwnode = of_node_to_fwnode(dev->of_node); 506 struct nwl_msi *msi = &pcie->msi; 507 508 msi->dev_domain = irq_domain_add_linear(NULL, INT_PCI_MSI_NR, 509 &dev_msi_domain_ops, pcie); 510 if (!msi->dev_domain) { 511 dev_err(dev, "failed to create dev IRQ domain\n"); 512 return -ENOMEM; 513 } 514 msi->msi_domain = pci_msi_create_irq_domain(fwnode, 515 &nwl_msi_domain_info, 516 msi->dev_domain); 517 if (!msi->msi_domain) { 518 dev_err(dev, "failed to create msi IRQ domain\n"); 519 irq_domain_remove(msi->dev_domain); 520 return -ENOMEM; 521 } 522 #endif 523 return 0; 524 } 525 526 static int nwl_pcie_init_irq_domain(struct nwl_pcie *pcie) 527 { 528 struct device *dev = pcie->dev; 529 struct device_node *node = dev->of_node; 530 struct device_node *legacy_intc_node; 531 532 legacy_intc_node = of_get_next_child(node, NULL); 533 if (!legacy_intc_node) { 534 dev_err(dev, "No legacy intc node found\n"); 535 return -EINVAL; 536 } 537 538 pcie->legacy_irq_domain = irq_domain_add_linear(legacy_intc_node, 539 PCI_NUM_INTX, 540 &legacy_domain_ops, 541 pcie); 542 of_node_put(legacy_intc_node); 543 if (!pcie->legacy_irq_domain) { 544 dev_err(dev, "failed to create IRQ domain\n"); 545 return -ENOMEM; 546 } 547 548 raw_spin_lock_init(&pcie->leg_mask_lock); 549 nwl_pcie_init_msi_irq_domain(pcie); 550 return 0; 551 } 552 553 static int nwl_pcie_enable_msi(struct nwl_pcie *pcie) 554 { 555 struct device *dev = pcie->dev; 556 struct platform_device *pdev = to_platform_device(dev); 557 struct nwl_msi *msi = &pcie->msi; 558 unsigned long base; 559 int ret; 560 561 mutex_init(&msi->lock); 562 563 /* Get msi_1 IRQ number */ 564 msi->irq_msi1 = platform_get_irq_byname(pdev, "msi1"); 565 if (msi->irq_msi1 < 0) 566 return -EINVAL; 567 568 irq_set_chained_handler_and_data(msi->irq_msi1, 569 nwl_pcie_msi_handler_high, pcie); 570 571 /* Get msi_0 IRQ number */ 572 msi->irq_msi0 = platform_get_irq_byname(pdev, "msi0"); 573 if (msi->irq_msi0 < 0) 574 return -EINVAL; 575 576 irq_set_chained_handler_and_data(msi->irq_msi0, 577 nwl_pcie_msi_handler_low, pcie); 578 579 /* Check for msii_present bit */ 580 ret = nwl_bridge_readl(pcie, I_MSII_CAPABILITIES) & MSII_PRESENT; 581 if (!ret) { 582 dev_err(dev, "MSI not present\n"); 583 return -EIO; 584 } 585 586 /* Enable MSII */ 587 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) | 588 MSII_ENABLE, I_MSII_CONTROL); 589 590 /* Enable MSII status */ 591 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, I_MSII_CONTROL) | 592 MSII_STATUS_ENABLE, I_MSII_CONTROL); 593 594 /* setup AFI/FPCI range */ 595 base = pcie->phys_pcie_reg_base; 596 nwl_bridge_writel(pcie, lower_32_bits(base), I_MSII_BASE_LO); 597 nwl_bridge_writel(pcie, upper_32_bits(base), I_MSII_BASE_HI); 598 599 /* 600 * For high range MSI interrupts: disable, clear any pending, 601 * and enable 602 */ 603 nwl_bridge_writel(pcie, 0, MSGF_MSI_MASK_HI); 604 605 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_HI) & 606 MSGF_MSI_SR_HI_MASK, MSGF_MSI_STATUS_HI); 607 608 nwl_bridge_writel(pcie, MSGF_MSI_SR_HI_MASK, MSGF_MSI_MASK_HI); 609 610 /* 611 * For low range MSI interrupts: disable, clear any pending, 612 * and enable 613 */ 614 nwl_bridge_writel(pcie, 0, MSGF_MSI_MASK_LO); 615 616 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MSI_STATUS_LO) & 617 MSGF_MSI_SR_LO_MASK, MSGF_MSI_STATUS_LO); 618 619 nwl_bridge_writel(pcie, MSGF_MSI_SR_LO_MASK, MSGF_MSI_MASK_LO); 620 621 return 0; 622 } 623 624 static int nwl_pcie_bridge_init(struct nwl_pcie *pcie) 625 { 626 struct device *dev = pcie->dev; 627 struct platform_device *pdev = to_platform_device(dev); 628 u32 breg_val, ecam_val, first_busno = 0; 629 int err; 630 631 breg_val = nwl_bridge_readl(pcie, E_BREG_CAPABILITIES) & BREG_PRESENT; 632 if (!breg_val) { 633 dev_err(dev, "BREG is not present\n"); 634 return breg_val; 635 } 636 637 /* Write bridge_off to breg base */ 638 nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_breg_base), 639 E_BREG_BASE_LO); 640 nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_breg_base), 641 E_BREG_BASE_HI); 642 643 /* Enable BREG */ 644 nwl_bridge_writel(pcie, ~BREG_ENABLE_FORCE & BREG_ENABLE, 645 E_BREG_CONTROL); 646 647 /* Disable DMA channel registers */ 648 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX0) | 649 CFG_DMA_REG_BAR, BRCFG_PCIE_RX0); 650 651 /* Enable Ingress subtractive decode translation */ 652 nwl_bridge_writel(pcie, SET_ISUB_CONTROL, I_ISUB_CONTROL); 653 654 /* Enable msg filtering details */ 655 nwl_bridge_writel(pcie, CFG_ENABLE_MSG_FILTER_MASK, 656 BRCFG_PCIE_RX_MSG_FILTER); 657 658 /* This routes the PCIe DMA traffic to go through CCI path */ 659 if (of_dma_is_coherent(dev->of_node)) 660 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX1) | 661 CFG_PCIE_CACHE, BRCFG_PCIE_RX1); 662 663 err = nwl_wait_for_link(pcie); 664 if (err) 665 return err; 666 667 ecam_val = nwl_bridge_readl(pcie, E_ECAM_CAPABILITIES) & E_ECAM_PRESENT; 668 if (!ecam_val) { 669 dev_err(dev, "ECAM is not present\n"); 670 return ecam_val; 671 } 672 673 /* Enable ECAM */ 674 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) | 675 E_ECAM_CR_ENABLE, E_ECAM_CONTROL); 676 677 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, E_ECAM_CONTROL) | 678 (pcie->ecam_value << E_ECAM_SIZE_SHIFT), 679 E_ECAM_CONTROL); 680 681 nwl_bridge_writel(pcie, lower_32_bits(pcie->phys_ecam_base), 682 E_ECAM_BASE_LO); 683 nwl_bridge_writel(pcie, upper_32_bits(pcie->phys_ecam_base), 684 E_ECAM_BASE_HI); 685 686 /* Get bus range */ 687 ecam_val = nwl_bridge_readl(pcie, E_ECAM_CONTROL); 688 pcie->last_busno = (ecam_val & E_ECAM_SIZE_LOC) >> E_ECAM_SIZE_SHIFT; 689 /* Write primary, secondary and subordinate bus numbers */ 690 ecam_val = first_busno; 691 ecam_val |= (first_busno + 1) << 8; 692 ecam_val |= (pcie->last_busno << E_ECAM_SIZE_SHIFT); 693 writel(ecam_val, (pcie->ecam_base + PCI_PRIMARY_BUS)); 694 695 if (nwl_pcie_link_up(pcie)) 696 dev_info(dev, "Link is UP\n"); 697 else 698 dev_info(dev, "Link is DOWN\n"); 699 700 /* Get misc IRQ number */ 701 pcie->irq_misc = platform_get_irq_byname(pdev, "misc"); 702 if (pcie->irq_misc < 0) 703 return -EINVAL; 704 705 err = devm_request_irq(dev, pcie->irq_misc, 706 nwl_pcie_misc_handler, IRQF_SHARED, 707 "nwl_pcie:misc", pcie); 708 if (err) { 709 dev_err(dev, "fail to register misc IRQ#%d\n", 710 pcie->irq_misc); 711 return err; 712 } 713 714 /* Disable all misc interrupts */ 715 nwl_bridge_writel(pcie, (u32)~MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK); 716 717 /* Clear pending misc interrupts */ 718 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_MISC_STATUS) & 719 MSGF_MISC_SR_MASKALL, MSGF_MISC_STATUS); 720 721 /* Enable all misc interrupts */ 722 nwl_bridge_writel(pcie, MSGF_MISC_SR_MASKALL, MSGF_MISC_MASK); 723 724 /* Disable all legacy interrupts */ 725 nwl_bridge_writel(pcie, (u32)~MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK); 726 727 /* Clear pending legacy interrupts */ 728 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_LEG_STATUS) & 729 MSGF_LEG_SR_MASKALL, MSGF_LEG_STATUS); 730 731 /* Enable all legacy interrupts */ 732 nwl_bridge_writel(pcie, MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK); 733 734 /* Enable the bridge config interrupt */ 735 nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_INTERRUPT) | 736 BRCFG_INTERRUPT_MASK, BRCFG_INTERRUPT); 737 738 return 0; 739 } 740 741 static int nwl_pcie_parse_dt(struct nwl_pcie *pcie, 742 struct platform_device *pdev) 743 { 744 struct device *dev = pcie->dev; 745 struct resource *res; 746 747 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "breg"); 748 pcie->breg_base = devm_ioremap_resource(dev, res); 749 if (IS_ERR(pcie->breg_base)) 750 return PTR_ERR(pcie->breg_base); 751 pcie->phys_breg_base = res->start; 752 753 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcireg"); 754 pcie->pcireg_base = devm_ioremap_resource(dev, res); 755 if (IS_ERR(pcie->pcireg_base)) 756 return PTR_ERR(pcie->pcireg_base); 757 pcie->phys_pcie_reg_base = res->start; 758 759 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg"); 760 pcie->ecam_base = devm_pci_remap_cfg_resource(dev, res); 761 if (IS_ERR(pcie->ecam_base)) 762 return PTR_ERR(pcie->ecam_base); 763 pcie->phys_ecam_base = res->start; 764 765 /* Get intx IRQ number */ 766 pcie->irq_intx = platform_get_irq_byname(pdev, "intx"); 767 if (pcie->irq_intx < 0) 768 return pcie->irq_intx; 769 770 irq_set_chained_handler_and_data(pcie->irq_intx, 771 nwl_pcie_leg_handler, pcie); 772 773 return 0; 774 } 775 776 static const struct of_device_id nwl_pcie_of_match[] = { 777 { .compatible = "xlnx,nwl-pcie-2.11", }, 778 {} 779 }; 780 781 static int nwl_pcie_probe(struct platform_device *pdev) 782 { 783 struct device *dev = &pdev->dev; 784 struct nwl_pcie *pcie; 785 struct pci_host_bridge *bridge; 786 int err; 787 788 bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie)); 789 if (!bridge) 790 return -ENODEV; 791 792 pcie = pci_host_bridge_priv(bridge); 793 platform_set_drvdata(pdev, pcie); 794 795 pcie->dev = dev; 796 pcie->ecam_value = NWL_ECAM_VALUE_DEFAULT; 797 798 err = nwl_pcie_parse_dt(pcie, pdev); 799 if (err) { 800 dev_err(dev, "Parsing DT failed\n"); 801 return err; 802 } 803 804 pcie->clk = devm_clk_get(dev, NULL); 805 if (IS_ERR(pcie->clk)) 806 return PTR_ERR(pcie->clk); 807 808 err = clk_prepare_enable(pcie->clk); 809 if (err) { 810 dev_err(dev, "can't enable PCIe ref clock\n"); 811 return err; 812 } 813 814 err = nwl_pcie_bridge_init(pcie); 815 if (err) { 816 dev_err(dev, "HW Initialization failed\n"); 817 goto err_clk; 818 } 819 820 err = nwl_pcie_init_irq_domain(pcie); 821 if (err) { 822 dev_err(dev, "Failed creating IRQ Domain\n"); 823 goto err_clk; 824 } 825 826 bridge->sysdata = pcie; 827 bridge->ops = &nwl_pcie_ops; 828 829 if (IS_ENABLED(CONFIG_PCI_MSI)) { 830 err = nwl_pcie_enable_msi(pcie); 831 if (err < 0) { 832 dev_err(dev, "failed to enable MSI support: %d\n", err); 833 goto err_clk; 834 } 835 } 836 837 err = pci_host_probe(bridge); 838 if (!err) 839 return 0; 840 841 err_clk: 842 clk_disable_unprepare(pcie->clk); 843 return err; 844 } 845 846 static void nwl_pcie_remove(struct platform_device *pdev) 847 { 848 struct nwl_pcie *pcie = platform_get_drvdata(pdev); 849 850 clk_disable_unprepare(pcie->clk); 851 } 852 853 static struct platform_driver nwl_pcie_driver = { 854 .driver = { 855 .name = "nwl-pcie", 856 .suppress_bind_attrs = true, 857 .of_match_table = nwl_pcie_of_match, 858 }, 859 .probe = nwl_pcie_probe, 860 .remove_new = nwl_pcie_remove, 861 }; 862 builtin_platform_driver(nwl_pcie_driver); 863