David Daney | 7b6e7ba | 2016-03-04 14:31:48 -0800 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2015, 2016 Cavium, Inc. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/ioport.h> |
| 12 | #include <linux/of_pci.h> |
| 13 | #include <linux/of.h> |
| 14 | #include <linux/platform_device.h> |
| 15 | |
| 16 | #include "pci-host-common.h" |
| 17 | |
| 18 | /* Mapping is standard ECAM */ |
| 19 | static void __iomem *thunder_ecam_map_bus(struct pci_bus *bus, |
| 20 | unsigned int devfn, |
| 21 | int where) |
| 22 | { |
| 23 | struct gen_pci *pci = bus->sysdata; |
| 24 | resource_size_t idx = bus->number - pci->cfg.bus_range->start; |
| 25 | |
| 26 | return pci->cfg.win[idx] + ((devfn << 12) | where); |
| 27 | } |
| 28 | |
| 29 | static void set_val(u32 v, int where, int size, u32 *val) |
| 30 | { |
| 31 | int shift = (where & 3) * 8; |
| 32 | |
| 33 | pr_debug("set_val %04x: %08x\n", (unsigned)(where & ~3), v); |
| 34 | v >>= shift; |
| 35 | if (size == 1) |
| 36 | v &= 0xff; |
| 37 | else if (size == 2) |
| 38 | v &= 0xffff; |
| 39 | *val = v; |
| 40 | } |
| 41 | |
| 42 | static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus, |
| 43 | unsigned int devfn, int where, int size, u32 *val) |
| 44 | { |
| 45 | void __iomem *addr; |
| 46 | u32 v; |
| 47 | |
| 48 | /* Entries are 16-byte aligned; bits[2,3] select word in entry */ |
| 49 | int where_a = where & 0xc; |
| 50 | |
| 51 | if (where_a == 0) { |
| 52 | set_val(e0, where, size, val); |
| 53 | return PCIBIOS_SUCCESSFUL; |
| 54 | } |
| 55 | if (where_a == 0x4) { |
| 56 | addr = bus->ops->map_bus(bus, devfn, bar); /* BAR 0 */ |
| 57 | if (!addr) { |
| 58 | *val = ~0; |
| 59 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 60 | } |
| 61 | v = readl(addr); |
| 62 | v &= ~0xf; |
| 63 | v |= 2; /* EA entry-1. Base-L */ |
| 64 | set_val(v, where, size, val); |
| 65 | return PCIBIOS_SUCCESSFUL; |
| 66 | } |
| 67 | if (where_a == 0x8) { |
| 68 | u32 barl_orig; |
| 69 | u32 barl_rb; |
| 70 | |
| 71 | addr = bus->ops->map_bus(bus, devfn, bar); /* BAR 0 */ |
| 72 | if (!addr) { |
| 73 | *val = ~0; |
| 74 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 75 | } |
| 76 | barl_orig = readl(addr + 0); |
| 77 | writel(0xffffffff, addr + 0); |
| 78 | barl_rb = readl(addr + 0); |
| 79 | writel(barl_orig, addr + 0); |
| 80 | /* zeros in unsettable bits */ |
| 81 | v = ~barl_rb & ~3; |
| 82 | v |= 0xc; /* EA entry-2. Offset-L */ |
| 83 | set_val(v, where, size, val); |
| 84 | return PCIBIOS_SUCCESSFUL; |
| 85 | } |
| 86 | if (where_a == 0xc) { |
| 87 | addr = bus->ops->map_bus(bus, devfn, bar + 4); /* BAR 1 */ |
| 88 | if (!addr) { |
| 89 | *val = ~0; |
| 90 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 91 | } |
| 92 | v = readl(addr); /* EA entry-3. Base-H */ |
| 93 | set_val(v, where, size, val); |
| 94 | return PCIBIOS_SUCCESSFUL; |
| 95 | } |
| 96 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 97 | } |
| 98 | |
| 99 | static int thunder_ecam_p2_config_read(struct pci_bus *bus, unsigned int devfn, |
| 100 | int where, int size, u32 *val) |
| 101 | { |
| 102 | struct gen_pci *pci = bus->sysdata; |
| 103 | int where_a = where & ~3; |
| 104 | void __iomem *addr; |
| 105 | u32 node_bits; |
| 106 | u32 v; |
| 107 | |
| 108 | /* EA Base[63:32] may be missing some bits ... */ |
| 109 | switch (where_a) { |
| 110 | case 0xa8: |
| 111 | case 0xbc: |
| 112 | case 0xd0: |
| 113 | case 0xe4: |
| 114 | break; |
| 115 | default: |
| 116 | return pci_generic_config_read(bus, devfn, where, size, val); |
| 117 | } |
| 118 | |
| 119 | addr = bus->ops->map_bus(bus, devfn, where_a); |
| 120 | if (!addr) { |
| 121 | *val = ~0; |
| 122 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 123 | } |
| 124 | |
| 125 | v = readl(addr); |
| 126 | |
| 127 | /* |
| 128 | * Bit 44 of the 64-bit Base must match the same bit in |
| 129 | * the config space access window. Since we are working with |
| 130 | * the high-order 32 bits, shift everything down by 32 bits. |
| 131 | */ |
| 132 | node_bits = (pci->cfg.res.start >> 32) & (1 << 12); |
| 133 | |
| 134 | v |= node_bits; |
| 135 | set_val(v, where, size, val); |
| 136 | |
| 137 | return PCIBIOS_SUCCESSFUL; |
| 138 | } |
| 139 | |
| 140 | static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn, |
| 141 | int where, int size, u32 *val) |
| 142 | { |
| 143 | u32 v; |
| 144 | u32 vendor_device; |
| 145 | u32 class_rev; |
| 146 | void __iomem *addr; |
| 147 | int cfg_type; |
| 148 | int where_a = where & ~3; |
| 149 | |
| 150 | addr = bus->ops->map_bus(bus, devfn, 0xc); |
| 151 | if (!addr) { |
| 152 | *val = ~0; |
| 153 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 154 | } |
| 155 | |
| 156 | v = readl(addr); |
| 157 | |
| 158 | /* Check for non type-00 header */ |
| 159 | cfg_type = (v >> 16) & 0x7f; |
| 160 | |
| 161 | addr = bus->ops->map_bus(bus, devfn, 8); |
| 162 | if (!addr) { |
| 163 | *val = ~0; |
| 164 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 165 | } |
| 166 | |
| 167 | class_rev = readl(addr); |
| 168 | if (class_rev == 0xffffffff) |
| 169 | goto no_emulation; |
| 170 | |
| 171 | if ((class_rev & 0xff) >= 8) { |
| 172 | /* Pass-2 handling */ |
| 173 | if (cfg_type) |
| 174 | goto no_emulation; |
| 175 | return thunder_ecam_p2_config_read(bus, devfn, where, |
| 176 | size, val); |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * All BARs have fixed addresses specified by the EA |
| 181 | * capability; they must return zero on read. |
| 182 | */ |
| 183 | if (cfg_type == 0 && |
| 184 | ((where >= 0x10 && where < 0x2c) || |
| 185 | (where >= 0x1a4 && where < 0x1bc))) { |
| 186 | /* BAR or SR-IOV BAR */ |
| 187 | *val = 0; |
| 188 | return PCIBIOS_SUCCESSFUL; |
| 189 | } |
| 190 | |
| 191 | addr = bus->ops->map_bus(bus, devfn, 0); |
| 192 | if (!addr) { |
| 193 | *val = ~0; |
| 194 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 195 | } |
| 196 | |
| 197 | vendor_device = readl(addr); |
| 198 | if (vendor_device == 0xffffffff) |
| 199 | goto no_emulation; |
| 200 | |
| 201 | pr_debug("%04x:%04x - Fix pass#: %08x, where: %03x, devfn: %03x\n", |
| 202 | vendor_device & 0xffff, vendor_device >> 16, class_rev, |
| 203 | (unsigned) where, devfn); |
| 204 | |
| 205 | /* Check for non type-00 header */ |
| 206 | if (cfg_type == 0) { |
| 207 | bool has_msix; |
| 208 | bool is_nic = (vendor_device == 0xa01e177d); |
| 209 | bool is_tns = (vendor_device == 0xa01f177d); |
| 210 | |
| 211 | addr = bus->ops->map_bus(bus, devfn, 0x70); |
| 212 | if (!addr) { |
| 213 | *val = ~0; |
| 214 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 215 | } |
| 216 | /* E_CAP */ |
| 217 | v = readl(addr); |
| 218 | has_msix = (v & 0xff00) != 0; |
| 219 | |
| 220 | if (!has_msix && where_a == 0x70) { |
| 221 | v |= 0xbc00; /* next capability is EA at 0xbc */ |
| 222 | set_val(v, where, size, val); |
| 223 | return PCIBIOS_SUCCESSFUL; |
| 224 | } |
| 225 | if (where_a == 0xb0) { |
| 226 | addr = bus->ops->map_bus(bus, devfn, where_a); |
| 227 | if (!addr) { |
| 228 | *val = ~0; |
| 229 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 230 | } |
| 231 | v = readl(addr); |
| 232 | if (v & 0xff00) |
| 233 | pr_err("Bad MSIX cap header: %08x\n", v); |
| 234 | v |= 0xbc00; /* next capability is EA at 0xbc */ |
| 235 | set_val(v, where, size, val); |
| 236 | return PCIBIOS_SUCCESSFUL; |
| 237 | } |
| 238 | if (where_a == 0xbc) { |
| 239 | if (is_nic) |
| 240 | v = 0x40014; /* EA last in chain, 4 entries */ |
| 241 | else if (is_tns) |
| 242 | v = 0x30014; /* EA last in chain, 3 entries */ |
| 243 | else if (has_msix) |
| 244 | v = 0x20014; /* EA last in chain, 2 entries */ |
| 245 | else |
| 246 | v = 0x10014; /* EA last in chain, 1 entry */ |
| 247 | set_val(v, where, size, val); |
| 248 | return PCIBIOS_SUCCESSFUL; |
| 249 | } |
| 250 | if (where_a >= 0xc0 && where_a < 0xd0) |
| 251 | /* EA entry-0. PP=0, BAR0 Size:3 */ |
| 252 | return handle_ea_bar(0x80ff0003, |
| 253 | 0x10, bus, devfn, where, |
| 254 | size, val); |
| 255 | if (where_a >= 0xd0 && where_a < 0xe0 && has_msix) |
| 256 | /* EA entry-1. PP=0, BAR4 Size:3 */ |
| 257 | return handle_ea_bar(0x80ff0043, |
| 258 | 0x20, bus, devfn, where, |
| 259 | size, val); |
| 260 | if (where_a >= 0xe0 && where_a < 0xf0 && is_tns) |
| 261 | /* EA entry-2. PP=0, BAR2, Size:3 */ |
| 262 | return handle_ea_bar(0x80ff0023, |
| 263 | 0x18, bus, devfn, where, |
| 264 | size, val); |
| 265 | if (where_a >= 0xe0 && where_a < 0xf0 && is_nic) |
| 266 | /* EA entry-2. PP=4, VF_BAR0 (9), Size:3 */ |
| 267 | return handle_ea_bar(0x80ff0493, |
| 268 | 0x1a4, bus, devfn, where, |
| 269 | size, val); |
| 270 | if (where_a >= 0xf0 && where_a < 0x100 && is_nic) |
| 271 | /* EA entry-3. PP=4, VF_BAR4 (d), Size:3 */ |
| 272 | return handle_ea_bar(0x80ff04d3, |
| 273 | 0x1b4, bus, devfn, where, |
| 274 | size, val); |
| 275 | } else if (cfg_type == 1) { |
| 276 | bool is_rsl_bridge = devfn == 0x08; |
| 277 | bool is_rad_bridge = devfn == 0xa0; |
| 278 | bool is_zip_bridge = devfn == 0xa8; |
| 279 | bool is_dfa_bridge = devfn == 0xb0; |
| 280 | bool is_nic_bridge = devfn == 0x10; |
| 281 | |
| 282 | if (where_a == 0x70) { |
| 283 | addr = bus->ops->map_bus(bus, devfn, where_a); |
| 284 | if (!addr) { |
| 285 | *val = ~0; |
| 286 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 287 | } |
| 288 | v = readl(addr); |
| 289 | if (v & 0xff00) |
| 290 | pr_err("Bad PCIe cap header: %08x\n", v); |
| 291 | v |= 0xbc00; /* next capability is EA at 0xbc */ |
| 292 | set_val(v, where, size, val); |
| 293 | return PCIBIOS_SUCCESSFUL; |
| 294 | } |
| 295 | if (where_a == 0xbc) { |
| 296 | if (is_nic_bridge) |
| 297 | v = 0x10014; /* EA last in chain, 1 entry */ |
| 298 | else |
| 299 | v = 0x00014; /* EA last in chain, no entries */ |
| 300 | set_val(v, where, size, val); |
| 301 | return PCIBIOS_SUCCESSFUL; |
| 302 | } |
| 303 | if (where_a == 0xc0) { |
| 304 | if (is_rsl_bridge || is_nic_bridge) |
| 305 | v = 0x0101; /* subordinate:secondary = 1:1 */ |
| 306 | else if (is_rad_bridge) |
| 307 | v = 0x0202; /* subordinate:secondary = 2:2 */ |
| 308 | else if (is_zip_bridge) |
| 309 | v = 0x0303; /* subordinate:secondary = 3:3 */ |
| 310 | else if (is_dfa_bridge) |
| 311 | v = 0x0404; /* subordinate:secondary = 4:4 */ |
| 312 | set_val(v, where, size, val); |
| 313 | return PCIBIOS_SUCCESSFUL; |
| 314 | } |
| 315 | if (where_a == 0xc4 && is_nic_bridge) { |
| 316 | /* Enabled, not-Write, SP=ff, PP=05, BEI=6, ES=4 */ |
| 317 | v = 0x80ff0564; |
| 318 | set_val(v, where, size, val); |
| 319 | return PCIBIOS_SUCCESSFUL; |
| 320 | } |
| 321 | if (where_a == 0xc8 && is_nic_bridge) { |
| 322 | v = 0x00000002; /* Base-L 64-bit */ |
| 323 | set_val(v, where, size, val); |
| 324 | return PCIBIOS_SUCCESSFUL; |
| 325 | } |
| 326 | if (where_a == 0xcc && is_nic_bridge) { |
| 327 | v = 0xfffffffe; /* MaxOffset-L 64-bit */ |
| 328 | set_val(v, where, size, val); |
| 329 | return PCIBIOS_SUCCESSFUL; |
| 330 | } |
| 331 | if (where_a == 0xd0 && is_nic_bridge) { |
| 332 | v = 0x00008430; /* NIC Base-H */ |
| 333 | set_val(v, where, size, val); |
| 334 | return PCIBIOS_SUCCESSFUL; |
| 335 | } |
| 336 | if (where_a == 0xd4 && is_nic_bridge) { |
| 337 | v = 0x0000000f; /* MaxOffset-H */ |
| 338 | set_val(v, where, size, val); |
| 339 | return PCIBIOS_SUCCESSFUL; |
| 340 | } |
| 341 | } |
| 342 | no_emulation: |
| 343 | return pci_generic_config_read(bus, devfn, where, size, val); |
| 344 | } |
| 345 | |
| 346 | static int thunder_ecam_config_write(struct pci_bus *bus, unsigned int devfn, |
| 347 | int where, int size, u32 val) |
| 348 | { |
| 349 | /* |
| 350 | * All BARs have fixed addresses; ignore BAR writes so they |
| 351 | * don't get corrupted. |
| 352 | */ |
| 353 | if ((where >= 0x10 && where < 0x2c) || |
| 354 | (where >= 0x1a4 && where < 0x1bc)) |
| 355 | /* BAR or SR-IOV BAR */ |
| 356 | return PCIBIOS_SUCCESSFUL; |
| 357 | |
| 358 | return pci_generic_config_write(bus, devfn, where, size, val); |
| 359 | } |
| 360 | |
| 361 | static struct gen_pci_cfg_bus_ops thunder_ecam_bus_ops = { |
| 362 | .bus_shift = 20, |
| 363 | .ops = { |
| 364 | .map_bus = thunder_ecam_map_bus, |
| 365 | .read = thunder_ecam_config_read, |
| 366 | .write = thunder_ecam_config_write, |
| 367 | } |
| 368 | }; |
| 369 | |
| 370 | static const struct of_device_id thunder_ecam_of_match[] = { |
| 371 | { .compatible = "cavium,pci-host-thunder-ecam", |
| 372 | .data = &thunder_ecam_bus_ops }, |
| 373 | |
| 374 | { }, |
| 375 | }; |
| 376 | MODULE_DEVICE_TABLE(of, thunder_ecam_of_match); |
| 377 | |
| 378 | static int thunder_ecam_probe(struct platform_device *pdev) |
| 379 | { |
| 380 | struct device *dev = &pdev->dev; |
| 381 | const struct of_device_id *of_id; |
| 382 | struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); |
| 383 | |
| 384 | if (!pci) |
| 385 | return -ENOMEM; |
| 386 | |
| 387 | of_id = of_match_node(thunder_ecam_of_match, dev->of_node); |
| 388 | pci->cfg.ops = (struct gen_pci_cfg_bus_ops *)of_id->data; |
| 389 | |
| 390 | return pci_host_common_probe(pdev, pci); |
| 391 | } |
| 392 | |
| 393 | static struct platform_driver thunder_ecam_driver = { |
| 394 | .driver = { |
| 395 | .name = KBUILD_MODNAME, |
| 396 | .of_match_table = thunder_ecam_of_match, |
| 397 | }, |
| 398 | .probe = thunder_ecam_probe, |
| 399 | }; |
| 400 | module_platform_driver(thunder_ecam_driver); |
| 401 | |
| 402 | MODULE_DESCRIPTION("Thunder ECAM PCI host driver"); |
| 403 | MODULE_LICENSE("GPL v2"); |