1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * PCIe driver for Marvell Armada 370 and Armada XP SoCs 4 * 5 * Author: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> 6 */ 7 8 #include <linux/kernel.h> 9 #include <linux/module.h> 10 #include <linux/pci.h> 11 #include <linux/bitfield.h> 12 #include <linux/clk.h> 13 #include <linux/delay.h> 14 #include <linux/gpio/consumer.h> 15 #include <linux/init.h> 16 #include <linux/irqchip/chained_irq.h> 17 #include <linux/irqdomain.h> 18 #include <linux/mbus.h> 19 #include <linux/slab.h> 20 #include <linux/platform_device.h> 21 #include <linux/of_address.h> 22 #include <linux/of_irq.h> 23 #include <linux/of_pci.h> 24 #include <linux/of_platform.h> 25 26 #include "../pci.h" 27 #include "../pci-bridge-emul.h" 28 29 /* 30 * PCIe unit register offsets. 31 */ 32 #define PCIE_DEV_ID_OFF 0x0000 33 #define PCIE_CMD_OFF 0x0004 34 #define PCIE_DEV_REV_OFF 0x0008 35 #define PCIE_BAR_LO_OFF(n) (0x0010 + ((n) << 3)) 36 #define PCIE_BAR_HI_OFF(n) (0x0014 + ((n) << 3)) 37 #define PCIE_SSDEV_ID_OFF 0x002c 38 #define PCIE_CAP_PCIEXP 0x0060 39 #define PCIE_CAP_PCIERR_OFF 0x0100 40 #define PCIE_BAR_CTRL_OFF(n) (0x1804 + (((n) - 1) * 4)) 41 #define PCIE_WIN04_CTRL_OFF(n) (0x1820 + ((n) << 4)) 42 #define PCIE_WIN04_BASE_OFF(n) (0x1824 + ((n) << 4)) 43 #define PCIE_WIN04_REMAP_OFF(n) (0x182c + ((n) << 4)) 44 #define PCIE_WIN5_CTRL_OFF 0x1880 45 #define PCIE_WIN5_BASE_OFF 0x1884 46 #define PCIE_WIN5_REMAP_OFF 0x188c 47 #define PCIE_CONF_ADDR_OFF 0x18f8 48 #define PCIE_CONF_ADDR_EN 0x80000000 49 #define PCIE_CONF_REG(r) ((((r) & 0xf00) << 16) | ((r) & 0xfc)) 50 #define PCIE_CONF_BUS(b) (((b) & 0xff) << 16) 51 #define PCIE_CONF_DEV(d) (((d) & 0x1f) << 11) 52 #define PCIE_CONF_FUNC(f) (((f) & 0x7) << 8) 53 #define PCIE_CONF_ADDR(bus, devfn, where) \ 54 (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \ 55 PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where) | \ 56 PCIE_CONF_ADDR_EN) 57 #define PCIE_CONF_DATA_OFF 0x18fc 58 #define PCIE_INT_CAUSE_OFF 0x1900 59 #define PCIE_INT_UNMASK_OFF 0x1910 60 #define PCIE_INT_INTX(i) BIT(24+i) 61 #define PCIE_INT_PM_PME BIT(28) 62 #define PCIE_INT_ALL_MASK GENMASK(31, 0) 63 #define PCIE_CTRL_OFF 0x1a00 64 #define PCIE_CTRL_X1_MODE 0x0001 65 #define PCIE_CTRL_RC_MODE BIT(1) 66 #define PCIE_CTRL_MASTER_HOT_RESET BIT(24) 67 #define PCIE_STAT_OFF 0x1a04 68 #define PCIE_STAT_BUS 0xff00 69 #define PCIE_STAT_DEV 0x1f0000 70 #define PCIE_STAT_LINK_DOWN BIT(0) 71 #define PCIE_SSPL_OFF 0x1a0c 72 #define PCIE_SSPL_VALUE_SHIFT 0 73 #define PCIE_SSPL_VALUE_MASK GENMASK(7, 0) 74 #define PCIE_SSPL_SCALE_SHIFT 8 75 #define PCIE_SSPL_SCALE_MASK GENMASK(9, 8) 76 #define PCIE_SSPL_ENABLE BIT(16) 77 #define PCIE_RC_RTSTA 0x1a14 78 #define PCIE_DEBUG_CTRL 0x1a60 79 #define PCIE_DEBUG_SOFT_RESET BIT(20) 80 81 struct mvebu_pcie_port; 82 83 /* Structure representing all PCIe interfaces */ 84 struct mvebu_pcie { 85 struct platform_device *pdev; 86 struct mvebu_pcie_port *ports; 87 struct resource io; 88 struct resource realio; 89 struct resource mem; 90 struct resource busn; 91 int nports; 92 }; 93 94 struct mvebu_pcie_window { 95 phys_addr_t base; 96 phys_addr_t remap; 97 size_t size; 98 }; 99 100 /* Structure representing one PCIe interface */ 101 struct mvebu_pcie_port { 102 char *name; 103 void __iomem *base; 104 u32 port; 105 u32 lane; 106 bool is_x4; 107 int devfn; 108 unsigned int mem_target; 109 unsigned int mem_attr; 110 unsigned int io_target; 111 unsigned int io_attr; 112 struct clk *clk; 113 struct gpio_desc *reset_gpio; 114 char *reset_name; 115 struct pci_bridge_emul bridge; 116 struct device_node *dn; 117 struct mvebu_pcie *pcie; 118 struct mvebu_pcie_window memwin; 119 struct mvebu_pcie_window iowin; 120 u32 saved_pcie_stat; 121 struct resource regs; 122 u8 slot_power_limit_value; 123 u8 slot_power_limit_scale; 124 struct irq_domain *intx_irq_domain; 125 raw_spinlock_t irq_lock; 126 int intx_irq; 127 }; 128 129 static inline void mvebu_writel(struct mvebu_pcie_port *port, u32 val, u32 reg) 130 { 131 writel(val, port->base + reg); 132 } 133 134 static inline u32 mvebu_readl(struct mvebu_pcie_port *port, u32 reg) 135 { 136 return readl(port->base + reg); 137 } 138 139 static inline bool mvebu_has_ioport(struct mvebu_pcie_port *port) 140 { 141 return port->io_target != -1 && port->io_attr != -1; 142 } 143 144 static bool mvebu_pcie_link_up(struct mvebu_pcie_port *port) 145 { 146 return !(mvebu_readl(port, PCIE_STAT_OFF) & PCIE_STAT_LINK_DOWN); 147 } 148 149 static u8 mvebu_pcie_get_local_bus_nr(struct mvebu_pcie_port *port) 150 { 151 return (mvebu_readl(port, PCIE_STAT_OFF) & PCIE_STAT_BUS) >> 8; 152 } 153 154 static void mvebu_pcie_set_local_bus_nr(struct mvebu_pcie_port *port, int nr) 155 { 156 u32 stat; 157 158 stat = mvebu_readl(port, PCIE_STAT_OFF); 159 stat &= ~PCIE_STAT_BUS; 160 stat |= nr << 8; 161 mvebu_writel(port, stat, PCIE_STAT_OFF); 162 } 163 164 static void mvebu_pcie_set_local_dev_nr(struct mvebu_pcie_port *port, int nr) 165 { 166 u32 stat; 167 168 stat = mvebu_readl(port, PCIE_STAT_OFF); 169 stat &= ~PCIE_STAT_DEV; 170 stat |= nr << 16; 171 mvebu_writel(port, stat, PCIE_STAT_OFF); 172 } 173 174 static void mvebu_pcie_disable_wins(struct mvebu_pcie_port *port) 175 { 176 int i; 177 178 mvebu_writel(port, 0, PCIE_BAR_LO_OFF(0)); 179 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(0)); 180 181 for (i = 1; i < 3; i++) { 182 mvebu_writel(port, 0, PCIE_BAR_CTRL_OFF(i)); 183 mvebu_writel(port, 0, PCIE_BAR_LO_OFF(i)); 184 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(i)); 185 } 186 187 for (i = 0; i < 5; i++) { 188 mvebu_writel(port, 0, PCIE_WIN04_CTRL_OFF(i)); 189 mvebu_writel(port, 0, PCIE_WIN04_BASE_OFF(i)); 190 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i)); 191 } 192 193 mvebu_writel(port, 0, PCIE_WIN5_CTRL_OFF); 194 mvebu_writel(port, 0, PCIE_WIN5_BASE_OFF); 195 mvebu_writel(port, 0, PCIE_WIN5_REMAP_OFF); 196 } 197 198 /* 199 * Setup PCIE BARs and Address Decode Wins: 200 * BAR[0] -> internal registers (needed for MSI) 201 * BAR[1] -> covers all DRAM banks 202 * BAR[2] -> Disabled 203 * WIN[0-3] -> DRAM bank[0-3] 204 */ 205 static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port) 206 { 207 const struct mbus_dram_target_info *dram; 208 u32 size; 209 int i; 210 211 dram = mv_mbus_dram_info(); 212 213 /* First, disable and clear BARs and windows. */ 214 mvebu_pcie_disable_wins(port); 215 216 /* Setup windows for DDR banks. Count total DDR size on the fly. */ 217 size = 0; 218 for (i = 0; i < dram->num_cs; i++) { 219 const struct mbus_dram_window *cs = dram->cs + i; 220 221 mvebu_writel(port, cs->base & 0xffff0000, 222 PCIE_WIN04_BASE_OFF(i)); 223 mvebu_writel(port, 0, PCIE_WIN04_REMAP_OFF(i)); 224 mvebu_writel(port, 225 ((cs->size - 1) & 0xffff0000) | 226 (cs->mbus_attr << 8) | 227 (dram->mbus_dram_target_id << 4) | 1, 228 PCIE_WIN04_CTRL_OFF(i)); 229 230 size += cs->size; 231 } 232 233 /* Round up 'size' to the nearest power of two. */ 234 if ((size & (size - 1)) != 0) 235 size = 1 << fls(size); 236 237 /* Setup BAR[1] to all DRAM banks. */ 238 mvebu_writel(port, dram->cs[0].base, PCIE_BAR_LO_OFF(1)); 239 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(1)); 240 mvebu_writel(port, ((size - 1) & 0xffff0000) | 1, 241 PCIE_BAR_CTRL_OFF(1)); 242 243 /* 244 * Point BAR[0] to the device's internal registers. 245 */ 246 mvebu_writel(port, round_down(port->regs.start, SZ_1M), PCIE_BAR_LO_OFF(0)); 247 mvebu_writel(port, 0, PCIE_BAR_HI_OFF(0)); 248 } 249 250 static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port) 251 { 252 u32 ctrl, lnkcap, cmd, dev_rev, unmask, sspl; 253 254 /* Setup PCIe controller to Root Complex mode. */ 255 ctrl = mvebu_readl(port, PCIE_CTRL_OFF); 256 ctrl |= PCIE_CTRL_RC_MODE; 257 mvebu_writel(port, ctrl, PCIE_CTRL_OFF); 258 259 /* 260 * Set Maximum Link Width to X1 or X4 in Root Port's PCIe Link 261 * Capability register. This register is defined by PCIe specification 262 * as read-only but this mvebu controller has it as read-write and must 263 * be set to number of SerDes PCIe lanes (1 or 4). If this register is 264 * not set correctly then link with endpoint card is not established. 265 */ 266 lnkcap = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP); 267 lnkcap &= ~PCI_EXP_LNKCAP_MLW; 268 lnkcap |= (port->is_x4 ? 4 : 1) << 4; 269 mvebu_writel(port, lnkcap, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP); 270 271 /* Disable Root Bridge I/O space, memory space and bus mastering. */ 272 cmd = mvebu_readl(port, PCIE_CMD_OFF); 273 cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); 274 mvebu_writel(port, cmd, PCIE_CMD_OFF); 275 276 /* 277 * Change Class Code of PCI Bridge device to PCI Bridge (0x6004) 278 * because default value is Memory controller (0x5080). 279 * 280 * Note that this mvebu PCI Bridge does not have compliant Type 1 281 * Configuration Space. Header Type is reported as Type 0 and it 282 * has format of Type 0 config space. 283 * 284 * Moreover Type 0 BAR registers (ranges 0x10 - 0x28 and 0x30 - 0x34) 285 * have the same format in Marvell's specification as in PCIe 286 * specification, but their meaning is totally different and they do 287 * different things: they are aliased into internal mvebu registers 288 * (e.g. PCIE_BAR_LO_OFF) and these should not be changed or 289 * reconfigured by pci device drivers. 290 * 291 * Therefore driver uses emulation of PCI Bridge which emulates 292 * access to configuration space via internal mvebu registers or 293 * emulated configuration buffer. Driver access these PCI Bridge 294 * directly for simplification, but these registers can be accessed 295 * also via standard mvebu way for accessing PCI config space. 296 */ 297 dev_rev = mvebu_readl(port, PCIE_DEV_REV_OFF); 298 dev_rev &= ~0xffffff00; 299 dev_rev |= PCI_CLASS_BRIDGE_PCI_NORMAL << 8; 300 mvebu_writel(port, dev_rev, PCIE_DEV_REV_OFF); 301 302 /* Point PCIe unit MBUS decode windows to DRAM space. */ 303 mvebu_pcie_setup_wins(port); 304 305 /* 306 * Program Root Port to automatically send Set_Slot_Power_Limit 307 * PCIe Message when changing status from Dl_Down to Dl_Up and valid 308 * slot power limit was specified. 309 */ 310 sspl = mvebu_readl(port, PCIE_SSPL_OFF); 311 sspl &= ~(PCIE_SSPL_VALUE_MASK | PCIE_SSPL_SCALE_MASK | PCIE_SSPL_ENABLE); 312 if (port->slot_power_limit_value) { 313 sspl |= port->slot_power_limit_value << PCIE_SSPL_VALUE_SHIFT; 314 sspl |= port->slot_power_limit_scale << PCIE_SSPL_SCALE_SHIFT; 315 sspl |= PCIE_SSPL_ENABLE; 316 } 317 mvebu_writel(port, sspl, PCIE_SSPL_OFF); 318 319 /* Mask all interrupt sources. */ 320 mvebu_writel(port, ~PCIE_INT_ALL_MASK, PCIE_INT_UNMASK_OFF); 321 322 /* Clear all interrupt causes. */ 323 mvebu_writel(port, ~PCIE_INT_ALL_MASK, PCIE_INT_CAUSE_OFF); 324 325 /* Check if "intx" interrupt was specified in DT. */ 326 if (port->intx_irq > 0) 327 return; 328 329 /* 330 * Fallback code when "intx" interrupt was not specified in DT: 331 * Unmask all legacy INTx interrupts as driver does not provide a way 332 * for masking and unmasking of individual legacy INTx interrupts. 333 * Legacy INTx are reported via one shared GIC source and therefore 334 * kernel cannot distinguish which individual legacy INTx was triggered. 335 * These interrupts are shared, so it should not cause any issue. Just 336 * performance penalty as every PCIe interrupt handler needs to be 337 * called when some interrupt is triggered. 338 */ 339 unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); 340 unmask |= PCIE_INT_INTX(0) | PCIE_INT_INTX(1) | 341 PCIE_INT_INTX(2) | PCIE_INT_INTX(3); 342 mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); 343 } 344 345 static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie, 346 struct pci_bus *bus, 347 int devfn); 348 349 static int mvebu_pcie_child_rd_conf(struct pci_bus *bus, u32 devfn, int where, 350 int size, u32 *val) 351 { 352 struct mvebu_pcie *pcie = bus->sysdata; 353 struct mvebu_pcie_port *port; 354 void __iomem *conf_data; 355 356 port = mvebu_pcie_find_port(pcie, bus, devfn); 357 if (!port) 358 return PCIBIOS_DEVICE_NOT_FOUND; 359 360 if (!mvebu_pcie_link_up(port)) 361 return PCIBIOS_DEVICE_NOT_FOUND; 362 363 conf_data = port->base + PCIE_CONF_DATA_OFF; 364 365 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where), 366 PCIE_CONF_ADDR_OFF); 367 368 switch (size) { 369 case 1: 370 *val = readb_relaxed(conf_data + (where & 3)); 371 break; 372 case 2: 373 *val = readw_relaxed(conf_data + (where & 2)); 374 break; 375 case 4: 376 *val = readl_relaxed(conf_data); 377 break; 378 default: 379 return PCIBIOS_BAD_REGISTER_NUMBER; 380 } 381 382 return PCIBIOS_SUCCESSFUL; 383 } 384 385 static int mvebu_pcie_child_wr_conf(struct pci_bus *bus, u32 devfn, 386 int where, int size, u32 val) 387 { 388 struct mvebu_pcie *pcie = bus->sysdata; 389 struct mvebu_pcie_port *port; 390 void __iomem *conf_data; 391 392 port = mvebu_pcie_find_port(pcie, bus, devfn); 393 if (!port) 394 return PCIBIOS_DEVICE_NOT_FOUND; 395 396 if (!mvebu_pcie_link_up(port)) 397 return PCIBIOS_DEVICE_NOT_FOUND; 398 399 conf_data = port->base + PCIE_CONF_DATA_OFF; 400 401 mvebu_writel(port, PCIE_CONF_ADDR(bus->number, devfn, where), 402 PCIE_CONF_ADDR_OFF); 403 404 switch (size) { 405 case 1: 406 writeb(val, conf_data + (where & 3)); 407 break; 408 case 2: 409 writew(val, conf_data + (where & 2)); 410 break; 411 case 4: 412 writel(val, conf_data); 413 break; 414 default: 415 return PCIBIOS_BAD_REGISTER_NUMBER; 416 } 417 418 return PCIBIOS_SUCCESSFUL; 419 } 420 421 static struct pci_ops mvebu_pcie_child_ops = { 422 .read = mvebu_pcie_child_rd_conf, 423 .write = mvebu_pcie_child_wr_conf, 424 }; 425 426 /* 427 * Remove windows, starting from the largest ones to the smallest 428 * ones. 429 */ 430 static void mvebu_pcie_del_windows(struct mvebu_pcie_port *port, 431 phys_addr_t base, size_t size) 432 { 433 while (size) { 434 size_t sz = 1 << (fls(size) - 1); 435 436 mvebu_mbus_del_window(base, sz); 437 base += sz; 438 size -= sz; 439 } 440 } 441 442 /* 443 * MBus windows can only have a power of two size, but PCI BARs do not 444 * have this constraint. Therefore, we have to split the PCI BAR into 445 * areas each having a power of two size. We start from the largest 446 * one (i.e highest order bit set in the size). 447 */ 448 static int mvebu_pcie_add_windows(struct mvebu_pcie_port *port, 449 unsigned int target, unsigned int attribute, 450 phys_addr_t base, size_t size, 451 phys_addr_t remap) 452 { 453 size_t size_mapped = 0; 454 455 while (size) { 456 size_t sz = 1 << (fls(size) - 1); 457 int ret; 458 459 ret = mvebu_mbus_add_window_remap_by_id(target, attribute, base, 460 sz, remap); 461 if (ret) { 462 phys_addr_t end = base + sz - 1; 463 464 dev_err(&port->pcie->pdev->dev, 465 "Could not create MBus window at [mem %pa-%pa]: %d\n", 466 &base, &end, ret); 467 mvebu_pcie_del_windows(port, base - size_mapped, 468 size_mapped); 469 return ret; 470 } 471 472 size -= sz; 473 size_mapped += sz; 474 base += sz; 475 if (remap != MVEBU_MBUS_NO_REMAP) 476 remap += sz; 477 } 478 479 return 0; 480 } 481 482 static int mvebu_pcie_set_window(struct mvebu_pcie_port *port, 483 unsigned int target, unsigned int attribute, 484 const struct mvebu_pcie_window *desired, 485 struct mvebu_pcie_window *cur) 486 { 487 int ret; 488 489 if (desired->base == cur->base && desired->remap == cur->remap && 490 desired->size == cur->size) 491 return 0; 492 493 if (cur->size != 0) { 494 mvebu_pcie_del_windows(port, cur->base, cur->size); 495 cur->size = 0; 496 cur->base = 0; 497 498 /* 499 * If something tries to change the window while it is enabled 500 * the change will not be done atomically. That would be 501 * difficult to do in the general case. 502 */ 503 } 504 505 if (desired->size == 0) 506 return 0; 507 508 ret = mvebu_pcie_add_windows(port, target, attribute, desired->base, 509 desired->size, desired->remap); 510 if (ret) { 511 cur->size = 0; 512 cur->base = 0; 513 return ret; 514 } 515 516 *cur = *desired; 517 return 0; 518 } 519 520 static int mvebu_pcie_handle_iobase_change(struct mvebu_pcie_port *port) 521 { 522 struct mvebu_pcie_window desired = {}; 523 struct pci_bridge_emul_conf *conf = &port->bridge.conf; 524 525 /* Are the new iobase/iolimit values invalid? */ 526 if (conf->iolimit < conf->iobase || 527 le16_to_cpu(conf->iolimitupper) < le16_to_cpu(conf->iobaseupper)) 528 return mvebu_pcie_set_window(port, port->io_target, port->io_attr, 529 &desired, &port->iowin); 530 531 /* 532 * We read the PCI-to-PCI bridge emulated registers, and 533 * calculate the base address and size of the address decoding 534 * window to setup, according to the PCI-to-PCI bridge 535 * specifications. iobase is the bus address, port->iowin_base 536 * is the CPU address. 537 */ 538 desired.remap = ((conf->iobase & 0xF0) << 8) | 539 (le16_to_cpu(conf->iobaseupper) << 16); 540 desired.base = port->pcie->io.start + desired.remap; 541 desired.size = ((0xFFF | ((conf->iolimit & 0xF0) << 8) | 542 (le16_to_cpu(conf->iolimitupper) << 16)) - 543 desired.remap) + 544 1; 545 546 return mvebu_pcie_set_window(port, port->io_target, port->io_attr, &desired, 547 &port->iowin); 548 } 549 550 static int mvebu_pcie_handle_membase_change(struct mvebu_pcie_port *port) 551 { 552 struct mvebu_pcie_window desired = {.remap = MVEBU_MBUS_NO_REMAP}; 553 struct pci_bridge_emul_conf *conf = &port->bridge.conf; 554 555 /* Are the new membase/memlimit values invalid? */ 556 if (le16_to_cpu(conf->memlimit) < le16_to_cpu(conf->membase)) 557 return mvebu_pcie_set_window(port, port->mem_target, port->mem_attr, 558 &desired, &port->memwin); 559 560 /* 561 * We read the PCI-to-PCI bridge emulated registers, and 562 * calculate the base address and size of the address decoding 563 * window to setup, according to the PCI-to-PCI bridge 564 * specifications. 565 */ 566 desired.base = ((le16_to_cpu(conf->membase) & 0xFFF0) << 16); 567 desired.size = (((le16_to_cpu(conf->memlimit) & 0xFFF0) << 16) | 0xFFFFF) - 568 desired.base + 1; 569 570 return mvebu_pcie_set_window(port, port->mem_target, port->mem_attr, &desired, 571 &port->memwin); 572 } 573 574 static pci_bridge_emul_read_status_t 575 mvebu_pci_bridge_emul_base_conf_read(struct pci_bridge_emul *bridge, 576 int reg, u32 *value) 577 { 578 struct mvebu_pcie_port *port = bridge->data; 579 580 switch (reg) { 581 case PCI_COMMAND: 582 *value = mvebu_readl(port, PCIE_CMD_OFF); 583 break; 584 585 case PCI_PRIMARY_BUS: { 586 /* 587 * From the whole 32bit register we support reading from HW only 588 * secondary bus number which is mvebu local bus number. 589 * Other bits are retrieved only from emulated config buffer. 590 */ 591 __le32 *cfgspace = (__le32 *)&bridge->conf; 592 u32 val = le32_to_cpu(cfgspace[PCI_PRIMARY_BUS / 4]); 593 val &= ~0xff00; 594 val |= mvebu_pcie_get_local_bus_nr(port) << 8; 595 *value = val; 596 break; 597 } 598 599 case PCI_INTERRUPT_LINE: { 600 /* 601 * From the whole 32bit register we support reading from HW only 602 * one bit: PCI_BRIDGE_CTL_BUS_RESET. 603 * Other bits are retrieved only from emulated config buffer. 604 */ 605 __le32 *cfgspace = (__le32 *)&bridge->conf; 606 u32 val = le32_to_cpu(cfgspace[PCI_INTERRUPT_LINE / 4]); 607 if (mvebu_readl(port, PCIE_CTRL_OFF) & PCIE_CTRL_MASTER_HOT_RESET) 608 val |= PCI_BRIDGE_CTL_BUS_RESET << 16; 609 else 610 val &= ~(PCI_BRIDGE_CTL_BUS_RESET << 16); 611 *value = val; 612 break; 613 } 614 615 default: 616 return PCI_BRIDGE_EMUL_NOT_HANDLED; 617 } 618 619 return PCI_BRIDGE_EMUL_HANDLED; 620 } 621 622 static pci_bridge_emul_read_status_t 623 mvebu_pci_bridge_emul_pcie_conf_read(struct pci_bridge_emul *bridge, 624 int reg, u32 *value) 625 { 626 struct mvebu_pcie_port *port = bridge->data; 627 628 switch (reg) { 629 case PCI_EXP_DEVCAP: 630 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCAP); 631 break; 632 633 case PCI_EXP_DEVCTL: 634 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL); 635 break; 636 637 case PCI_EXP_LNKCAP: 638 /* 639 * PCIe requires that the Clock Power Management capability bit 640 * is hard-wired to zero for downstream ports but HW returns 1. 641 * Additionally enable Data Link Layer Link Active Reporting 642 * Capable bit as DL_Active indication is provided too. 643 */ 644 *value = (mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCAP) & 645 ~PCI_EXP_LNKCAP_CLKPM) | PCI_EXP_LNKCAP_DLLLARC; 646 break; 647 648 case PCI_EXP_LNKCTL: 649 /* DL_Active indication is provided via PCIE_STAT_OFF */ 650 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL) | 651 (mvebu_pcie_link_up(port) ? 652 (PCI_EXP_LNKSTA_DLLLA << 16) : 0); 653 break; 654 655 case PCI_EXP_SLTCTL: { 656 u16 slotctl = le16_to_cpu(bridge->pcie_conf.slotctl); 657 u16 slotsta = le16_to_cpu(bridge->pcie_conf.slotsta); 658 u32 val = 0; 659 /* 660 * When slot power limit was not specified in DT then 661 * ASPL_DISABLE bit is stored only in emulated config space. 662 * Otherwise reflect status of PCIE_SSPL_ENABLE bit in HW. 663 */ 664 if (!port->slot_power_limit_value) 665 val |= slotctl & PCI_EXP_SLTCTL_ASPL_DISABLE; 666 else if (!(mvebu_readl(port, PCIE_SSPL_OFF) & PCIE_SSPL_ENABLE)) 667 val |= PCI_EXP_SLTCTL_ASPL_DISABLE; 668 /* This callback is 32-bit and in high bits is slot status. */ 669 val |= slotsta << 16; 670 *value = val; 671 break; 672 } 673 674 case PCI_EXP_RTSTA: 675 *value = mvebu_readl(port, PCIE_RC_RTSTA); 676 break; 677 678 case PCI_EXP_DEVCAP2: 679 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCAP2); 680 break; 681 682 case PCI_EXP_DEVCTL2: 683 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL2); 684 break; 685 686 case PCI_EXP_LNKCTL2: 687 *value = mvebu_readl(port, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL2); 688 break; 689 690 default: 691 return PCI_BRIDGE_EMUL_NOT_HANDLED; 692 } 693 694 return PCI_BRIDGE_EMUL_HANDLED; 695 } 696 697 static pci_bridge_emul_read_status_t 698 mvebu_pci_bridge_emul_ext_conf_read(struct pci_bridge_emul *bridge, 699 int reg, u32 *value) 700 { 701 struct mvebu_pcie_port *port = bridge->data; 702 703 switch (reg) { 704 case 0: 705 case PCI_ERR_UNCOR_STATUS: 706 case PCI_ERR_UNCOR_MASK: 707 case PCI_ERR_UNCOR_SEVER: 708 case PCI_ERR_COR_STATUS: 709 case PCI_ERR_COR_MASK: 710 case PCI_ERR_CAP: 711 case PCI_ERR_HEADER_LOG+0: 712 case PCI_ERR_HEADER_LOG+4: 713 case PCI_ERR_HEADER_LOG+8: 714 case PCI_ERR_HEADER_LOG+12: 715 case PCI_ERR_ROOT_COMMAND: 716 case PCI_ERR_ROOT_STATUS: 717 case PCI_ERR_ROOT_ERR_SRC: 718 *value = mvebu_readl(port, PCIE_CAP_PCIERR_OFF + reg); 719 break; 720 721 default: 722 return PCI_BRIDGE_EMUL_NOT_HANDLED; 723 } 724 725 return PCI_BRIDGE_EMUL_HANDLED; 726 } 727 728 static void 729 mvebu_pci_bridge_emul_base_conf_write(struct pci_bridge_emul *bridge, 730 int reg, u32 old, u32 new, u32 mask) 731 { 732 struct mvebu_pcie_port *port = bridge->data; 733 struct pci_bridge_emul_conf *conf = &bridge->conf; 734 735 switch (reg) { 736 case PCI_COMMAND: 737 mvebu_writel(port, new, PCIE_CMD_OFF); 738 break; 739 740 case PCI_IO_BASE: 741 if ((mask & 0xffff) && mvebu_has_ioport(port) && 742 mvebu_pcie_handle_iobase_change(port)) { 743 /* On error disable IO range */ 744 conf->iobase &= ~0xf0; 745 conf->iolimit &= ~0xf0; 746 conf->iobase |= 0xf0; 747 conf->iobaseupper = cpu_to_le16(0x0000); 748 conf->iolimitupper = cpu_to_le16(0x0000); 749 } 750 break; 751 752 case PCI_MEMORY_BASE: 753 if (mvebu_pcie_handle_membase_change(port)) { 754 /* On error disable mem range */ 755 conf->membase = cpu_to_le16(le16_to_cpu(conf->membase) & ~0xfff0); 756 conf->memlimit = cpu_to_le16(le16_to_cpu(conf->memlimit) & ~0xfff0); 757 conf->membase = cpu_to_le16(le16_to_cpu(conf->membase) | 0xfff0); 758 } 759 break; 760 761 case PCI_IO_BASE_UPPER16: 762 if (mvebu_has_ioport(port) && 763 mvebu_pcie_handle_iobase_change(port)) { 764 /* On error disable IO range */ 765 conf->iobase &= ~0xf0; 766 conf->iolimit &= ~0xf0; 767 conf->iobase |= 0xf0; 768 conf->iobaseupper = cpu_to_le16(0x0000); 769 conf->iolimitupper = cpu_to_le16(0x0000); 770 } 771 break; 772 773 case PCI_PRIMARY_BUS: 774 if (mask & 0xff00) 775 mvebu_pcie_set_local_bus_nr(port, conf->secondary_bus); 776 break; 777 778 case PCI_INTERRUPT_LINE: 779 if (mask & (PCI_BRIDGE_CTL_BUS_RESET << 16)) { 780 u32 ctrl = mvebu_readl(port, PCIE_CTRL_OFF); 781 if (new & (PCI_BRIDGE_CTL_BUS_RESET << 16)) 782 ctrl |= PCIE_CTRL_MASTER_HOT_RESET; 783 else 784 ctrl &= ~PCIE_CTRL_MASTER_HOT_RESET; 785 mvebu_writel(port, ctrl, PCIE_CTRL_OFF); 786 } 787 break; 788 789 default: 790 break; 791 } 792 } 793 794 static void 795 mvebu_pci_bridge_emul_pcie_conf_write(struct pci_bridge_emul *bridge, 796 int reg, u32 old, u32 new, u32 mask) 797 { 798 struct mvebu_pcie_port *port = bridge->data; 799 800 switch (reg) { 801 case PCI_EXP_DEVCTL: 802 mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL); 803 break; 804 805 case PCI_EXP_LNKCTL: 806 /* 807 * PCIe requires that the Enable Clock Power Management bit 808 * is hard-wired to zero for downstream ports but HW allows 809 * to change it. 810 */ 811 new &= ~PCI_EXP_LNKCTL_CLKREQ_EN; 812 813 mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL); 814 break; 815 816 case PCI_EXP_SLTCTL: 817 /* 818 * Allow to change PCIE_SSPL_ENABLE bit only when slot power 819 * limit was specified in DT and configured into HW. 820 */ 821 if ((mask & PCI_EXP_SLTCTL_ASPL_DISABLE) && 822 port->slot_power_limit_value) { 823 u32 sspl = mvebu_readl(port, PCIE_SSPL_OFF); 824 if (new & PCI_EXP_SLTCTL_ASPL_DISABLE) 825 sspl &= ~PCIE_SSPL_ENABLE; 826 else 827 sspl |= PCIE_SSPL_ENABLE; 828 mvebu_writel(port, sspl, PCIE_SSPL_OFF); 829 } 830 break; 831 832 case PCI_EXP_RTSTA: 833 /* 834 * PME Status bit in Root Status Register (PCIE_RC_RTSTA) 835 * is read-only and can be cleared only by writing 0b to the 836 * Interrupt Cause RW0C register (PCIE_INT_CAUSE_OFF). So 837 * clear PME via Interrupt Cause. 838 */ 839 if (new & PCI_EXP_RTSTA_PME) 840 mvebu_writel(port, ~PCIE_INT_PM_PME, PCIE_INT_CAUSE_OFF); 841 break; 842 843 case PCI_EXP_DEVCTL2: 844 mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_DEVCTL2); 845 break; 846 847 case PCI_EXP_LNKCTL2: 848 mvebu_writel(port, new, PCIE_CAP_PCIEXP + PCI_EXP_LNKCTL2); 849 break; 850 851 default: 852 break; 853 } 854 } 855 856 static void 857 mvebu_pci_bridge_emul_ext_conf_write(struct pci_bridge_emul *bridge, 858 int reg, u32 old, u32 new, u32 mask) 859 { 860 struct mvebu_pcie_port *port = bridge->data; 861 862 switch (reg) { 863 /* These are W1C registers, so clear other bits */ 864 case PCI_ERR_UNCOR_STATUS: 865 case PCI_ERR_COR_STATUS: 866 case PCI_ERR_ROOT_STATUS: 867 new &= mask; 868 fallthrough; 869 870 case PCI_ERR_UNCOR_MASK: 871 case PCI_ERR_UNCOR_SEVER: 872 case PCI_ERR_COR_MASK: 873 case PCI_ERR_CAP: 874 case PCI_ERR_HEADER_LOG+0: 875 case PCI_ERR_HEADER_LOG+4: 876 case PCI_ERR_HEADER_LOG+8: 877 case PCI_ERR_HEADER_LOG+12: 878 case PCI_ERR_ROOT_COMMAND: 879 case PCI_ERR_ROOT_ERR_SRC: 880 mvebu_writel(port, new, PCIE_CAP_PCIERR_OFF + reg); 881 break; 882 883 default: 884 break; 885 } 886 } 887 888 static const struct pci_bridge_emul_ops mvebu_pci_bridge_emul_ops = { 889 .read_base = mvebu_pci_bridge_emul_base_conf_read, 890 .write_base = mvebu_pci_bridge_emul_base_conf_write, 891 .read_pcie = mvebu_pci_bridge_emul_pcie_conf_read, 892 .write_pcie = mvebu_pci_bridge_emul_pcie_conf_write, 893 .read_ext = mvebu_pci_bridge_emul_ext_conf_read, 894 .write_ext = mvebu_pci_bridge_emul_ext_conf_write, 895 }; 896 897 /* 898 * Initialize the configuration space of the PCI-to-PCI bridge 899 * associated with the given PCIe interface. 900 */ 901 static int mvebu_pci_bridge_emul_init(struct mvebu_pcie_port *port) 902 { 903 unsigned int bridge_flags = PCI_BRIDGE_EMUL_NO_PREFMEM_FORWARD; 904 struct pci_bridge_emul *bridge = &port->bridge; 905 u32 dev_id = mvebu_readl(port, PCIE_DEV_ID_OFF); 906 u32 dev_rev = mvebu_readl(port, PCIE_DEV_REV_OFF); 907 u32 ssdev_id = mvebu_readl(port, PCIE_SSDEV_ID_OFF); 908 u32 pcie_cap = mvebu_readl(port, PCIE_CAP_PCIEXP); 909 u8 pcie_cap_ver = ((pcie_cap >> 16) & PCI_EXP_FLAGS_VERS); 910 911 bridge->conf.vendor = cpu_to_le16(dev_id & 0xffff); 912 bridge->conf.device = cpu_to_le16(dev_id >> 16); 913 bridge->conf.class_revision = cpu_to_le32(dev_rev & 0xff); 914 915 if (mvebu_has_ioport(port)) { 916 /* We support 32 bits I/O addressing */ 917 bridge->conf.iobase = PCI_IO_RANGE_TYPE_32; 918 bridge->conf.iolimit = PCI_IO_RANGE_TYPE_32; 919 } else { 920 bridge_flags |= PCI_BRIDGE_EMUL_NO_IO_FORWARD; 921 } 922 923 /* 924 * Older mvebu hardware provides PCIe Capability structure only in 925 * version 1. New hardware provides it in version 2. 926 * Enable slot support which is emulated. 927 */ 928 bridge->pcie_conf.cap = cpu_to_le16(pcie_cap_ver | PCI_EXP_FLAGS_SLOT); 929 930 /* 931 * Set Presence Detect State bit permanently as there is no support for 932 * unplugging PCIe card from the slot. Assume that PCIe card is always 933 * connected in slot. 934 * 935 * Set physical slot number to port+1 as mvebu ports are indexed from 936 * zero and zero value is reserved for ports within the same silicon 937 * as Root Port which is not mvebu case. 938 * 939 * Also set correct slot power limit. 940 */ 941 bridge->pcie_conf.slotcap = cpu_to_le32( 942 FIELD_PREP(PCI_EXP_SLTCAP_SPLV, port->slot_power_limit_value) | 943 FIELD_PREP(PCI_EXP_SLTCAP_SPLS, port->slot_power_limit_scale) | 944 FIELD_PREP(PCI_EXP_SLTCAP_PSN, port->port+1)); 945 bridge->pcie_conf.slotsta = cpu_to_le16(PCI_EXP_SLTSTA_PDS); 946 947 bridge->subsystem_vendor_id = ssdev_id & 0xffff; 948 bridge->subsystem_id = ssdev_id >> 16; 949 bridge->has_pcie = true; 950 bridge->pcie_start = PCIE_CAP_PCIEXP; 951 bridge->data = port; 952 bridge->ops = &mvebu_pci_bridge_emul_ops; 953 954 return pci_bridge_emul_init(bridge, bridge_flags); 955 } 956 957 static inline struct mvebu_pcie *sys_to_pcie(struct pci_sys_data *sys) 958 { 959 return sys->private_data; 960 } 961 962 static struct mvebu_pcie_port *mvebu_pcie_find_port(struct mvebu_pcie *pcie, 963 struct pci_bus *bus, 964 int devfn) 965 { 966 int i; 967 968 for (i = 0; i < pcie->nports; i++) { 969 struct mvebu_pcie_port *port = &pcie->ports[i]; 970 971 if (!port->base) 972 continue; 973 974 if (bus->number == 0 && port->devfn == devfn) 975 return port; 976 if (bus->number != 0 && 977 bus->number >= port->bridge.conf.secondary_bus && 978 bus->number <= port->bridge.conf.subordinate_bus) 979 return port; 980 } 981 982 return NULL; 983 } 984 985 /* PCI configuration space write function */ 986 static int mvebu_pcie_wr_conf(struct pci_bus *bus, u32 devfn, 987 int where, int size, u32 val) 988 { 989 struct mvebu_pcie *pcie = bus->sysdata; 990 struct mvebu_pcie_port *port; 991 992 port = mvebu_pcie_find_port(pcie, bus, devfn); 993 if (!port) 994 return PCIBIOS_DEVICE_NOT_FOUND; 995 996 return pci_bridge_emul_conf_write(&port->bridge, where, size, val); 997 } 998 999 /* PCI configuration space read function */ 1000 static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where, 1001 int size, u32 *val) 1002 { 1003 struct mvebu_pcie *pcie = bus->sysdata; 1004 struct mvebu_pcie_port *port; 1005 1006 port = mvebu_pcie_find_port(pcie, bus, devfn); 1007 if (!port) 1008 return PCIBIOS_DEVICE_NOT_FOUND; 1009 1010 return pci_bridge_emul_conf_read(&port->bridge, where, size, val); 1011 } 1012 1013 static struct pci_ops mvebu_pcie_ops = { 1014 .read = mvebu_pcie_rd_conf, 1015 .write = mvebu_pcie_wr_conf, 1016 }; 1017 1018 static void mvebu_pcie_intx_irq_mask(struct irq_data *d) 1019 { 1020 struct mvebu_pcie_port *port = d->domain->host_data; 1021 irq_hw_number_t hwirq = irqd_to_hwirq(d); 1022 unsigned long flags; 1023 u32 unmask; 1024 1025 raw_spin_lock_irqsave(&port->irq_lock, flags); 1026 unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); 1027 unmask &= ~PCIE_INT_INTX(hwirq); 1028 mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); 1029 raw_spin_unlock_irqrestore(&port->irq_lock, flags); 1030 } 1031 1032 static void mvebu_pcie_intx_irq_unmask(struct irq_data *d) 1033 { 1034 struct mvebu_pcie_port *port = d->domain->host_data; 1035 irq_hw_number_t hwirq = irqd_to_hwirq(d); 1036 unsigned long flags; 1037 u32 unmask; 1038 1039 raw_spin_lock_irqsave(&port->irq_lock, flags); 1040 unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); 1041 unmask |= PCIE_INT_INTX(hwirq); 1042 mvebu_writel(port, unmask, PCIE_INT_UNMASK_OFF); 1043 raw_spin_unlock_irqrestore(&port->irq_lock, flags); 1044 } 1045 1046 static struct irq_chip intx_irq_chip = { 1047 .name = "mvebu-INTx", 1048 .irq_mask = mvebu_pcie_intx_irq_mask, 1049 .irq_unmask = mvebu_pcie_intx_irq_unmask, 1050 }; 1051 1052 static int mvebu_pcie_intx_irq_map(struct irq_domain *h, 1053 unsigned int virq, irq_hw_number_t hwirq) 1054 { 1055 struct mvebu_pcie_port *port = h->host_data; 1056 1057 irq_set_status_flags(virq, IRQ_LEVEL); 1058 irq_set_chip_and_handler(virq, &intx_irq_chip, handle_level_irq); 1059 irq_set_chip_data(virq, port); 1060 1061 return 0; 1062 } 1063 1064 static const struct irq_domain_ops mvebu_pcie_intx_irq_domain_ops = { 1065 .map = mvebu_pcie_intx_irq_map, 1066 .xlate = irq_domain_xlate_onecell, 1067 }; 1068 1069 static int mvebu_pcie_init_irq_domain(struct mvebu_pcie_port *port) 1070 { 1071 struct device *dev = &port->pcie->pdev->dev; 1072 struct device_node *pcie_intc_node; 1073 1074 raw_spin_lock_init(&port->irq_lock); 1075 1076 pcie_intc_node = of_get_next_child(port->dn, NULL); 1077 if (!pcie_intc_node) { 1078 dev_err(dev, "No PCIe Intc node found for %s\n", port->name); 1079 return -ENODEV; 1080 } 1081 1082 port->intx_irq_domain = irq_domain_add_linear(pcie_intc_node, PCI_NUM_INTX, 1083 &mvebu_pcie_intx_irq_domain_ops, 1084 port); 1085 of_node_put(pcie_intc_node); 1086 if (!port->intx_irq_domain) { 1087 dev_err(dev, "Failed to get INTx IRQ domain for %s\n", port->name); 1088 return -ENOMEM; 1089 } 1090 1091 return 0; 1092 } 1093 1094 static void mvebu_pcie_irq_handler(struct irq_desc *desc) 1095 { 1096 struct mvebu_pcie_port *port = irq_desc_get_handler_data(desc); 1097 struct irq_chip *chip = irq_desc_get_chip(desc); 1098 struct device *dev = &port->pcie->pdev->dev; 1099 u32 cause, unmask, status; 1100 int i; 1101 1102 chained_irq_enter(chip, desc); 1103 1104 cause = mvebu_readl(port, PCIE_INT_CAUSE_OFF); 1105 unmask = mvebu_readl(port, PCIE_INT_UNMASK_OFF); 1106 status = cause & unmask; 1107 1108 /* Process legacy INTx interrupts */ 1109 for (i = 0; i < PCI_NUM_INTX; i++) { 1110 if (!(status & PCIE_INT_INTX(i))) 1111 continue; 1112 1113 if (generic_handle_domain_irq(port->intx_irq_domain, i) == -EINVAL) 1114 dev_err_ratelimited(dev, "unexpected INT%c IRQ\n", (char)i+'A'); 1115 } 1116 1117 chained_irq_exit(chip, desc); 1118 } 1119 1120 static int mvebu_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) 1121 { 1122 /* Interrupt support on mvebu emulated bridges is not implemented yet */ 1123 if (dev->bus->number == 0) 1124 return 0; /* Proper return code 0 == NO_IRQ */ 1125 1126 return of_irq_parse_and_map_pci(dev, slot, pin); 1127 } 1128 1129 static resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev, 1130 const struct resource *res, 1131 resource_size_t start, 1132 resource_size_t size, 1133 resource_size_t align) 1134 { 1135 if (dev->bus->number != 0) 1136 return start; 1137 1138 /* 1139 * On the PCI-to-PCI bridge side, the I/O windows must have at 1140 * least a 64 KB size and the memory windows must have at 1141 * least a 1 MB size. Moreover, MBus windows need to have a 1142 * base address aligned on their size, and their size must be 1143 * a power of two. This means that if the BAR doesn't have a 1144 * power of two size, several MBus windows will actually be 1145 * created. We need to ensure that the biggest MBus window 1146 * (which will be the first one) is aligned on its size, which 1147 * explains the rounddown_pow_of_two() being done here. 1148 */ 1149 if (res->flags & IORESOURCE_IO) 1150 return round_up(start, max_t(resource_size_t, SZ_64K, 1151 rounddown_pow_of_two(size))); 1152 else if (res->flags & IORESOURCE_MEM) 1153 return round_up(start, max_t(resource_size_t, SZ_1M, 1154 rounddown_pow_of_two(size))); 1155 else 1156 return start; 1157 } 1158 1159 static void __iomem *mvebu_pcie_map_registers(struct platform_device *pdev, 1160 struct device_node *np, 1161 struct mvebu_pcie_port *port) 1162 { 1163 int ret = 0; 1164 1165 ret = of_address_to_resource(np, 0, &port->regs); 1166 if (ret) 1167 return (void __iomem *)ERR_PTR(ret); 1168 1169 return devm_ioremap_resource(&pdev->dev, &port->regs); 1170 } 1171 1172 #define DT_FLAGS_TO_TYPE(flags) (((flags) >> 24) & 0x03) 1173 #define DT_TYPE_IO 0x1 1174 #define DT_TYPE_MEM32 0x2 1175 #define DT_CPUADDR_TO_TARGET(cpuaddr) (((cpuaddr) >> 56) & 0xFF) 1176 #define DT_CPUADDR_TO_ATTR(cpuaddr) (((cpuaddr) >> 48) & 0xFF) 1177 1178 static int mvebu_get_tgt_attr(struct device_node *np, int devfn, 1179 unsigned long type, 1180 unsigned int *tgt, 1181 unsigned int *attr) 1182 { 1183 const int na = 3, ns = 2; 1184 const __be32 *range; 1185 int rlen, nranges, rangesz, pna, i; 1186 1187 *tgt = -1; 1188 *attr = -1; 1189 1190 range = of_get_property(np, "ranges", &rlen); 1191 if (!range) 1192 return -EINVAL; 1193 1194 pna = of_n_addr_cells(np); 1195 rangesz = pna + na + ns; 1196 nranges = rlen / sizeof(__be32) / rangesz; 1197 1198 for (i = 0; i < nranges; i++, range += rangesz) { 1199 u32 flags = of_read_number(range, 1); 1200 u32 slot = of_read_number(range + 1, 1); 1201 u64 cpuaddr = of_read_number(range + na, pna); 1202 unsigned long rtype; 1203 1204 if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO) 1205 rtype = IORESOURCE_IO; 1206 else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32) 1207 rtype = IORESOURCE_MEM; 1208 else 1209 continue; 1210 1211 if (slot == PCI_SLOT(devfn) && type == rtype) { 1212 *tgt = DT_CPUADDR_TO_TARGET(cpuaddr); 1213 *attr = DT_CPUADDR_TO_ATTR(cpuaddr); 1214 return 0; 1215 } 1216 } 1217 1218 return -ENOENT; 1219 } 1220 1221 static int mvebu_pcie_suspend(struct device *dev) 1222 { 1223 struct mvebu_pcie *pcie; 1224 int i; 1225 1226 pcie = dev_get_drvdata(dev); 1227 for (i = 0; i < pcie->nports; i++) { 1228 struct mvebu_pcie_port *port = pcie->ports + i; 1229 if (!port->base) 1230 continue; 1231 port->saved_pcie_stat = mvebu_readl(port, PCIE_STAT_OFF); 1232 } 1233 1234 return 0; 1235 } 1236 1237 static int mvebu_pcie_resume(struct device *dev) 1238 { 1239 struct mvebu_pcie *pcie; 1240 int i; 1241 1242 pcie = dev_get_drvdata(dev); 1243 for (i = 0; i < pcie->nports; i++) { 1244 struct mvebu_pcie_port *port = pcie->ports + i; 1245 if (!port->base) 1246 continue; 1247 mvebu_writel(port, port->saved_pcie_stat, PCIE_STAT_OFF); 1248 mvebu_pcie_setup_hw(port); 1249 } 1250 1251 return 0; 1252 } 1253 1254 static void mvebu_pcie_port_clk_put(void *data) 1255 { 1256 struct mvebu_pcie_port *port = data; 1257 1258 clk_put(port->clk); 1259 } 1260 1261 static int mvebu_pcie_parse_port(struct mvebu_pcie *pcie, 1262 struct mvebu_pcie_port *port, struct device_node *child) 1263 { 1264 struct device *dev = &pcie->pdev->dev; 1265 u32 slot_power_limit; 1266 int ret; 1267 u32 num_lanes; 1268 1269 port->pcie = pcie; 1270 1271 if (of_property_read_u32(child, "marvell,pcie-port", &port->port)) { 1272 dev_warn(dev, "ignoring %pOF, missing pcie-port property\n", 1273 child); 1274 goto skip; 1275 } 1276 1277 if (of_property_read_u32(child, "marvell,pcie-lane", &port->lane)) 1278 port->lane = 0; 1279 1280 if (!of_property_read_u32(child, "num-lanes", &num_lanes) && num_lanes == 4) 1281 port->is_x4 = true; 1282 1283 port->name = devm_kasprintf(dev, GFP_KERNEL, "pcie%d.%d", port->port, 1284 port->lane); 1285 if (!port->name) { 1286 ret = -ENOMEM; 1287 goto err; 1288 } 1289 1290 port->devfn = of_pci_get_devfn(child); 1291 if (port->devfn < 0) 1292 goto skip; 1293 if (PCI_FUNC(port->devfn) != 0) { 1294 dev_err(dev, "%s: invalid function number, must be zero\n", 1295 port->name); 1296 goto skip; 1297 } 1298 1299 ret = mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_MEM, 1300 &port->mem_target, &port->mem_attr); 1301 if (ret < 0) { 1302 dev_err(dev, "%s: cannot get tgt/attr for mem window\n", 1303 port->name); 1304 goto skip; 1305 } 1306 1307 if (resource_size(&pcie->io) != 0) { 1308 mvebu_get_tgt_attr(dev->of_node, port->devfn, IORESOURCE_IO, 1309 &port->io_target, &port->io_attr); 1310 } else { 1311 port->io_target = -1; 1312 port->io_attr = -1; 1313 } 1314 1315 /* 1316 * Old DT bindings do not contain "intx" interrupt 1317 * so do not fail probing driver when interrupt does not exist. 1318 */ 1319 port->intx_irq = of_irq_get_byname(child, "intx"); 1320 if (port->intx_irq == -EPROBE_DEFER) { 1321 ret = port->intx_irq; 1322 goto err; 1323 } 1324 if (port->intx_irq <= 0) { 1325 dev_warn(dev, "%s: legacy INTx interrupts cannot be masked individually, " 1326 "%pOF does not contain intx interrupt\n", 1327 port->name, child); 1328 } 1329 1330 port->reset_name = devm_kasprintf(dev, GFP_KERNEL, "%s-reset", 1331 port->name); 1332 if (!port->reset_name) { 1333 ret = -ENOMEM; 1334 goto err; 1335 } 1336 1337 port->reset_gpio = devm_fwnode_gpiod_get(dev, of_fwnode_handle(child), 1338 "reset", GPIOD_OUT_HIGH, 1339 port->name); 1340 ret = PTR_ERR_OR_ZERO(port->reset_gpio); 1341 if (ret) { 1342 if (ret != -ENOENT) 1343 goto err; 1344 /* reset gpio is optional */ 1345 port->reset_gpio = NULL; 1346 devm_kfree(dev, port->reset_name); 1347 port->reset_name = NULL; 1348 } 1349 1350 slot_power_limit = of_pci_get_slot_power_limit(child, 1351 &port->slot_power_limit_value, 1352 &port->slot_power_limit_scale); 1353 if (slot_power_limit) 1354 dev_info(dev, "%s: Slot power limit %u.%uW\n", 1355 port->name, 1356 slot_power_limit / 1000, 1357 (slot_power_limit / 100) % 10); 1358 1359 port->clk = of_clk_get_by_name(child, NULL); 1360 if (IS_ERR(port->clk)) { 1361 dev_err(dev, "%s: cannot get clock\n", port->name); 1362 goto skip; 1363 } 1364 1365 ret = devm_add_action(dev, mvebu_pcie_port_clk_put, port); 1366 if (ret < 0) { 1367 clk_put(port->clk); 1368 goto err; 1369 } 1370 1371 return 1; 1372 1373 skip: 1374 ret = 0; 1375 1376 /* In the case of skipping, we need to free these */ 1377 devm_kfree(dev, port->reset_name); 1378 port->reset_name = NULL; 1379 devm_kfree(dev, port->name); 1380 port->name = NULL; 1381 1382 err: 1383 return ret; 1384 } 1385 1386 /* 1387 * Power up a PCIe port. PCIe requires the refclk to be stable for 100µs 1388 * prior to releasing PERST. See table 2-4 in section 2.6.2 AC Specifications 1389 * of the PCI Express Card Electromechanical Specification, 1.1. 1390 */ 1391 static int mvebu_pcie_powerup(struct mvebu_pcie_port *port) 1392 { 1393 int ret; 1394 1395 ret = clk_prepare_enable(port->clk); 1396 if (ret < 0) 1397 return ret; 1398 1399 if (port->reset_gpio) { 1400 u32 reset_udelay = PCI_PM_D3COLD_WAIT * 1000; 1401 1402 of_property_read_u32(port->dn, "reset-delay-us", 1403 &reset_udelay); 1404 1405 udelay(100); 1406 1407 gpiod_set_value_cansleep(port->reset_gpio, 0); 1408 msleep(reset_udelay / 1000); 1409 } 1410 1411 return 0; 1412 } 1413 1414 /* 1415 * Power down a PCIe port. Strictly, PCIe requires us to place the card 1416 * in D3hot state before asserting PERST#. 1417 */ 1418 static void mvebu_pcie_powerdown(struct mvebu_pcie_port *port) 1419 { 1420 gpiod_set_value_cansleep(port->reset_gpio, 1); 1421 1422 clk_disable_unprepare(port->clk); 1423 } 1424 1425 /* 1426 * devm_of_pci_get_host_bridge_resources() only sets up translateable resources, 1427 * so we need extra resource setup parsing our special DT properties encoding 1428 * the MEM and IO apertures. 1429 */ 1430 static int mvebu_pcie_parse_request_resources(struct mvebu_pcie *pcie) 1431 { 1432 struct device *dev = &pcie->pdev->dev; 1433 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie); 1434 int ret; 1435 1436 /* Get the PCIe memory aperture */ 1437 mvebu_mbus_get_pcie_mem_aperture(&pcie->mem); 1438 if (resource_size(&pcie->mem) == 0) { 1439 dev_err(dev, "invalid memory aperture size\n"); 1440 return -EINVAL; 1441 } 1442 1443 pcie->mem.name = "PCI MEM"; 1444 pci_add_resource(&bridge->windows, &pcie->mem); 1445 ret = devm_request_resource(dev, &iomem_resource, &pcie->mem); 1446 if (ret) 1447 return ret; 1448 1449 /* Get the PCIe IO aperture */ 1450 mvebu_mbus_get_pcie_io_aperture(&pcie->io); 1451 1452 if (resource_size(&pcie->io) != 0) { 1453 pcie->realio.flags = pcie->io.flags; 1454 pcie->realio.start = PCIBIOS_MIN_IO; 1455 pcie->realio.end = min_t(resource_size_t, 1456 IO_SPACE_LIMIT - SZ_64K, 1457 resource_size(&pcie->io) - 1); 1458 pcie->realio.name = "PCI I/O"; 1459 1460 ret = devm_pci_remap_iospace(dev, &pcie->realio, pcie->io.start); 1461 if (ret) 1462 return ret; 1463 1464 pci_add_resource(&bridge->windows, &pcie->realio); 1465 ret = devm_request_resource(dev, &ioport_resource, &pcie->realio); 1466 if (ret) 1467 return ret; 1468 } 1469 1470 return 0; 1471 } 1472 1473 static int mvebu_pcie_probe(struct platform_device *pdev) 1474 { 1475 struct device *dev = &pdev->dev; 1476 struct mvebu_pcie *pcie; 1477 struct pci_host_bridge *bridge; 1478 struct device_node *np = dev->of_node; 1479 struct device_node *child; 1480 int num, i, ret; 1481 1482 bridge = devm_pci_alloc_host_bridge(dev, sizeof(struct mvebu_pcie)); 1483 if (!bridge) 1484 return -ENOMEM; 1485 1486 pcie = pci_host_bridge_priv(bridge); 1487 pcie->pdev = pdev; 1488 platform_set_drvdata(pdev, pcie); 1489 1490 ret = mvebu_pcie_parse_request_resources(pcie); 1491 if (ret) 1492 return ret; 1493 1494 num = of_get_available_child_count(np); 1495 1496 pcie->ports = devm_kcalloc(dev, num, sizeof(*pcie->ports), GFP_KERNEL); 1497 if (!pcie->ports) 1498 return -ENOMEM; 1499 1500 i = 0; 1501 for_each_available_child_of_node(np, child) { 1502 struct mvebu_pcie_port *port = &pcie->ports[i]; 1503 1504 ret = mvebu_pcie_parse_port(pcie, port, child); 1505 if (ret < 0) { 1506 of_node_put(child); 1507 return ret; 1508 } else if (ret == 0) { 1509 continue; 1510 } 1511 1512 port->dn = child; 1513 i++; 1514 } 1515 pcie->nports = i; 1516 1517 for (i = 0; i < pcie->nports; i++) { 1518 struct mvebu_pcie_port *port = &pcie->ports[i]; 1519 int irq = port->intx_irq; 1520 1521 child = port->dn; 1522 if (!child) 1523 continue; 1524 1525 ret = mvebu_pcie_powerup(port); 1526 if (ret < 0) 1527 continue; 1528 1529 port->base = mvebu_pcie_map_registers(pdev, child, port); 1530 if (IS_ERR(port->base)) { 1531 dev_err(dev, "%s: cannot map registers\n", port->name); 1532 port->base = NULL; 1533 mvebu_pcie_powerdown(port); 1534 continue; 1535 } 1536 1537 ret = mvebu_pci_bridge_emul_init(port); 1538 if (ret < 0) { 1539 dev_err(dev, "%s: cannot init emulated bridge\n", 1540 port->name); 1541 devm_iounmap(dev, port->base); 1542 port->base = NULL; 1543 mvebu_pcie_powerdown(port); 1544 continue; 1545 } 1546 1547 if (irq > 0) { 1548 ret = mvebu_pcie_init_irq_domain(port); 1549 if (ret) { 1550 dev_err(dev, "%s: cannot init irq domain\n", 1551 port->name); 1552 pci_bridge_emul_cleanup(&port->bridge); 1553 devm_iounmap(dev, port->base); 1554 port->base = NULL; 1555 mvebu_pcie_powerdown(port); 1556 continue; 1557 } 1558 irq_set_chained_handler_and_data(irq, 1559 mvebu_pcie_irq_handler, 1560 port); 1561 } 1562 1563 /* 1564 * PCIe topology exported by mvebu hw is quite complicated. In 1565 * reality has something like N fully independent host bridges 1566 * where each host bridge has one PCIe Root Port (which acts as 1567 * PCI Bridge device). Each host bridge has its own independent 1568 * internal registers, independent access to PCI config space, 1569 * independent interrupt lines, independent window and memory 1570 * access configuration. But additionally there is some kind of 1571 * peer-to-peer support between PCIe devices behind different 1572 * host bridges limited just to forwarding of memory and I/O 1573 * transactions (forwarding of error messages and config cycles 1574 * is not supported). So we could say there are N independent 1575 * PCIe Root Complexes. 1576 * 1577 * For this kind of setup DT should have been structured into 1578 * N independent PCIe controllers / host bridges. But instead 1579 * structure in past was defined to put PCIe Root Ports of all 1580 * host bridges into one bus zero, like in classic multi-port 1581 * Root Complex setup with just one host bridge. 1582 * 1583 * This means that pci-mvebu.c driver provides "virtual" bus 0 1584 * on which registers all PCIe Root Ports (PCI Bridge devices) 1585 * specified in DT by their BDF addresses and virtually routes 1586 * PCI config access of each PCI bridge device to specific PCIe 1587 * host bridge. 1588 * 1589 * Normally PCI Bridge should choose between Type 0 and Type 1 1590 * config requests based on primary and secondary bus numbers 1591 * configured on the bridge itself. But because mvebu PCI Bridge 1592 * does not have registers for primary and secondary bus numbers 1593 * in its config space, it determinates type of config requests 1594 * via its own custom way. 1595 * 1596 * There are two options how mvebu determinate type of config 1597 * request. 1598 * 1599 * 1. If Secondary Bus Number Enable bit is not set or is not 1600 * available (applies for pre-XP PCIe controllers) then Type 0 1601 * is used if target bus number equals Local Bus Number (bits 1602 * [15:8] in register 0x1a04) and target device number differs 1603 * from Local Device Number (bits [20:16] in register 0x1a04). 1604 * Type 1 is used if target bus number differs from Local Bus 1605 * Number. And when target bus number equals Local Bus Number 1606 * and target device equals Local Device Number then request is 1607 * routed to Local PCI Bridge (PCIe Root Port). 1608 * 1609 * 2. If Secondary Bus Number Enable bit is set (bit 7 in 1610 * register 0x1a2c) then mvebu hw determinate type of config 1611 * request like compliant PCI Bridge based on primary bus number 1612 * which is configured via Local Bus Number (bits [15:8] in 1613 * register 0x1a04) and secondary bus number which is configured 1614 * via Secondary Bus Number (bits [7:0] in register 0x1a2c). 1615 * Local PCI Bridge (PCIe Root Port) is available on primary bus 1616 * as device with Local Device Number (bits [20:16] in register 1617 * 0x1a04). 1618 * 1619 * Secondary Bus Number Enable bit is disabled by default and 1620 * option 2. is not available on pre-XP PCIe controllers. Hence 1621 * this driver always use option 1. 1622 * 1623 * Basically it means that primary and secondary buses shares 1624 * one virtual number configured via Local Bus Number bits and 1625 * Local Device Number bits determinates if accessing primary 1626 * or secondary bus. Set Local Device Number to 1 and redirect 1627 * all writes of PCI Bridge Secondary Bus Number register to 1628 * Local Bus Number (bits [15:8] in register 0x1a04). 1629 * 1630 * So when accessing devices on buses behind secondary bus 1631 * number it would work correctly. And also when accessing 1632 * device 0 at secondary bus number via config space would be 1633 * correctly routed to secondary bus. Due to issues described 1634 * in mvebu_pcie_setup_hw(), PCI Bridges at primary bus (zero) 1635 * are not accessed directly via PCI config space but rarher 1636 * indirectly via kernel emulated PCI bridge driver. 1637 */ 1638 mvebu_pcie_setup_hw(port); 1639 mvebu_pcie_set_local_dev_nr(port, 1); 1640 mvebu_pcie_set_local_bus_nr(port, 0); 1641 } 1642 1643 bridge->sysdata = pcie; 1644 bridge->ops = &mvebu_pcie_ops; 1645 bridge->child_ops = &mvebu_pcie_child_ops; 1646 bridge->align_resource = mvebu_pcie_align_resource; 1647 bridge->map_irq = mvebu_pcie_map_irq; 1648 1649 return pci_host_probe(bridge); 1650 } 1651 1652 static void mvebu_pcie_remove(struct platform_device *pdev) 1653 { 1654 struct mvebu_pcie *pcie = platform_get_drvdata(pdev); 1655 struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie); 1656 u32 cmd, sspl; 1657 int i; 1658 1659 /* Remove PCI bus with all devices. */ 1660 pci_lock_rescan_remove(); 1661 pci_stop_root_bus(bridge->bus); 1662 pci_remove_root_bus(bridge->bus); 1663 pci_unlock_rescan_remove(); 1664 1665 for (i = 0; i < pcie->nports; i++) { 1666 struct mvebu_pcie_port *port = &pcie->ports[i]; 1667 int irq = port->intx_irq; 1668 1669 if (!port->base) 1670 continue; 1671 1672 /* Disable Root Bridge I/O space, memory space and bus mastering. */ 1673 cmd = mvebu_readl(port, PCIE_CMD_OFF); 1674 cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); 1675 mvebu_writel(port, cmd, PCIE_CMD_OFF); 1676 1677 /* Mask all interrupt sources. */ 1678 mvebu_writel(port, ~PCIE_INT_ALL_MASK, PCIE_INT_UNMASK_OFF); 1679 1680 /* Clear all interrupt causes. */ 1681 mvebu_writel(port, ~PCIE_INT_ALL_MASK, PCIE_INT_CAUSE_OFF); 1682 1683 if (irq > 0) 1684 irq_set_chained_handler_and_data(irq, NULL, NULL); 1685 1686 /* Remove IRQ domains. */ 1687 if (port->intx_irq_domain) 1688 irq_domain_remove(port->intx_irq_domain); 1689 1690 /* Free config space for emulated root bridge. */ 1691 pci_bridge_emul_cleanup(&port->bridge); 1692 1693 /* Disable sending Set_Slot_Power_Limit PCIe Message. */ 1694 sspl = mvebu_readl(port, PCIE_SSPL_OFF); 1695 sspl &= ~(PCIE_SSPL_VALUE_MASK | PCIE_SSPL_SCALE_MASK | PCIE_SSPL_ENABLE); 1696 mvebu_writel(port, sspl, PCIE_SSPL_OFF); 1697 1698 /* Disable and clear BARs and windows. */ 1699 mvebu_pcie_disable_wins(port); 1700 1701 /* Delete PCIe IO and MEM windows. */ 1702 if (port->iowin.size) 1703 mvebu_pcie_del_windows(port, port->iowin.base, port->iowin.size); 1704 if (port->memwin.size) 1705 mvebu_pcie_del_windows(port, port->memwin.base, port->memwin.size); 1706 1707 /* Power down card and disable clocks. Must be the last step. */ 1708 mvebu_pcie_powerdown(port); 1709 } 1710 } 1711 1712 static const struct of_device_id mvebu_pcie_of_match_table[] = { 1713 { .compatible = "marvell,armada-xp-pcie", }, 1714 { .compatible = "marvell,armada-370-pcie", }, 1715 { .compatible = "marvell,dove-pcie", }, 1716 { .compatible = "marvell,kirkwood-pcie", }, 1717 {}, 1718 }; 1719 1720 static const struct dev_pm_ops mvebu_pcie_pm_ops = { 1721 NOIRQ_SYSTEM_SLEEP_PM_OPS(mvebu_pcie_suspend, mvebu_pcie_resume) 1722 }; 1723 1724 static struct platform_driver mvebu_pcie_driver = { 1725 .driver = { 1726 .name = "mvebu-pcie", 1727 .of_match_table = mvebu_pcie_of_match_table, 1728 .pm = &mvebu_pcie_pm_ops, 1729 }, 1730 .probe = mvebu_pcie_probe, 1731 .remove_new = mvebu_pcie_remove, 1732 }; 1733 module_platform_driver(mvebu_pcie_driver); 1734 1735 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@bootlin.com>"); 1736 MODULE_AUTHOR("Pali Rohár <pali@kernel.org>"); 1737 MODULE_DESCRIPTION("Marvell EBU PCIe controller"); 1738 MODULE_LICENSE("GPL v2"); 1739