1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * ipmi_si_platform.c 4 * 5 * Handling for platform devices in IPMI (ACPI, OF, and things 6 * coming from the platform. 7 */ 8 9 #define pr_fmt(fmt) "ipmi_platform: " fmt 10 #define dev_fmt pr_fmt 11 12 #include <linux/types.h> 13 #include <linux/module.h> 14 #include <linux/of_device.h> 15 #include <linux/of_platform.h> 16 #include <linux/of_address.h> 17 #include <linux/of_irq.h> 18 #include <linux/acpi.h> 19 #include "ipmi_si.h" 20 #include "ipmi_dmi.h" 21 22 static bool platform_registered; 23 static bool si_tryplatform = true; 24 #ifdef CONFIG_ACPI 25 static bool si_tryacpi = true; 26 #endif 27 #ifdef CONFIG_OF 28 static bool si_tryopenfirmware = true; 29 #endif 30 #ifdef CONFIG_DMI 31 static bool si_trydmi = true; 32 #else 33 static bool si_trydmi = false; 34 #endif 35 36 module_param_named(tryplatform, si_tryplatform, bool, 0); 37 MODULE_PARM_DESC(tryplatform, "Setting this to zero will disable the" 38 " default scan of the interfaces identified via platform" 39 " interfaces besides ACPI, OpenFirmware, and DMI"); 40 #ifdef CONFIG_ACPI 41 module_param_named(tryacpi, si_tryacpi, bool, 0); 42 MODULE_PARM_DESC(tryacpi, "Setting this to zero will disable the" 43 " default scan of the interfaces identified via ACPI"); 44 #endif 45 #ifdef CONFIG_OF 46 module_param_named(tryopenfirmware, si_tryopenfirmware, bool, 0); 47 MODULE_PARM_DESC(tryopenfirmware, "Setting this to zero will disable the" 48 " default scan of the interfaces identified via OpenFirmware"); 49 #endif 50 #ifdef CONFIG_DMI 51 module_param_named(trydmi, si_trydmi, bool, 0); 52 MODULE_PARM_DESC(trydmi, "Setting this to zero will disable the" 53 " default scan of the interfaces identified via DMI"); 54 #endif 55 56 #ifdef CONFIG_ACPI 57 /* For GPE-type interrupts. */ 58 static u32 ipmi_acpi_gpe(acpi_handle gpe_device, 59 u32 gpe_number, void *context) 60 { 61 struct si_sm_io *io = context; 62 63 ipmi_si_irq_handler(io->irq, io->irq_handler_data); 64 return ACPI_INTERRUPT_HANDLED; 65 } 66 67 static void acpi_gpe_irq_cleanup(struct si_sm_io *io) 68 { 69 if (!io->irq) 70 return; 71 72 ipmi_irq_start_cleanup(io); 73 acpi_remove_gpe_handler(NULL, io->irq, &ipmi_acpi_gpe); 74 } 75 76 static int acpi_gpe_irq_setup(struct si_sm_io *io) 77 { 78 acpi_status status; 79 80 if (!io->irq) 81 return 0; 82 83 status = acpi_install_gpe_handler(NULL, 84 io->irq, 85 ACPI_GPE_LEVEL_TRIGGERED, 86 &ipmi_acpi_gpe, 87 io); 88 if (status != AE_OK) { 89 dev_warn(io->dev, 90 "Unable to claim ACPI GPE %d, running polled\n", 91 io->irq); 92 io->irq = 0; 93 return -EINVAL; 94 } else { 95 io->irq_cleanup = acpi_gpe_irq_cleanup; 96 ipmi_irq_finish_setup(io); 97 dev_info(io->dev, "Using ACPI GPE %d\n", io->irq); 98 return 0; 99 } 100 } 101 #endif 102 103 static struct resource * 104 ipmi_get_info_from_resources(struct platform_device *pdev, 105 struct si_sm_io *io) 106 { 107 struct resource *res, *res_second; 108 109 res = platform_get_resource(pdev, IORESOURCE_IO, 0); 110 if (res) { 111 io->addr_space = IPMI_IO_ADDR_SPACE; 112 } else { 113 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 114 if (res) 115 io->addr_space = IPMI_MEM_ADDR_SPACE; 116 } 117 if (!res) { 118 dev_err(&pdev->dev, "no I/O or memory address\n"); 119 return NULL; 120 } 121 io->addr_data = res->start; 122 123 io->regspacing = DEFAULT_REGSPACING; 124 res_second = platform_get_resource(pdev, 125 (io->addr_space == IPMI_IO_ADDR_SPACE) ? 126 IORESOURCE_IO : IORESOURCE_MEM, 127 1); 128 if (res_second) { 129 if (res_second->start > io->addr_data) 130 io->regspacing = res_second->start - io->addr_data; 131 } 132 133 return res; 134 } 135 136 static int platform_ipmi_probe(struct platform_device *pdev) 137 { 138 struct si_sm_io io; 139 u8 type, slave_addr, addr_source, regsize, regshift; 140 int rv; 141 142 rv = device_property_read_u8(&pdev->dev, "addr-source", &addr_source); 143 if (rv) 144 addr_source = SI_PLATFORM; 145 if (addr_source >= SI_LAST) 146 return -EINVAL; 147 148 if (addr_source == SI_SMBIOS) { 149 if (!si_trydmi) 150 return -ENODEV; 151 } else if (addr_source != SI_HARDCODED) { 152 if (!si_tryplatform) 153 return -ENODEV; 154 } 155 156 rv = device_property_read_u8(&pdev->dev, "ipmi-type", &type); 157 if (rv) 158 return -ENODEV; 159 160 memset(&io, 0, sizeof(io)); 161 io.addr_source = addr_source; 162 dev_info(&pdev->dev, "probing via %s\n", 163 ipmi_addr_src_to_str(addr_source)); 164 165 switch (type) { 166 case SI_KCS: 167 case SI_SMIC: 168 case SI_BT: 169 io.si_type = type; 170 break; 171 case SI_TYPE_INVALID: /* User disabled this in hardcode. */ 172 return -ENODEV; 173 default: 174 dev_err(&pdev->dev, "ipmi-type property is invalid\n"); 175 return -EINVAL; 176 } 177 178 io.regsize = DEFAULT_REGSIZE; 179 rv = device_property_read_u8(&pdev->dev, "reg-size", ®size); 180 if (!rv) 181 io.regsize = regsize; 182 183 io.regshift = 0; 184 rv = device_property_read_u8(&pdev->dev, "reg-shift", ®shift); 185 if (!rv) 186 io.regshift = regshift; 187 188 if (!ipmi_get_info_from_resources(pdev, &io)) 189 return -EINVAL; 190 191 rv = device_property_read_u8(&pdev->dev, "slave-addr", &slave_addr); 192 if (rv) 193 io.slave_addr = 0x20; 194 else 195 io.slave_addr = slave_addr; 196 197 io.irq = platform_get_irq(pdev, 0); 198 if (io.irq > 0) 199 io.irq_setup = ipmi_std_irq_setup; 200 else 201 io.irq = 0; 202 203 io.dev = &pdev->dev; 204 205 pr_info("ipmi_si: %s: %s %#lx regsize %d spacing %d irq %d\n", 206 ipmi_addr_src_to_str(addr_source), 207 (io.addr_space == IPMI_IO_ADDR_SPACE) ? "io" : "mem", 208 io.addr_data, io.regsize, io.regspacing, io.irq); 209 210 ipmi_si_add_smi(&io); 211 212 return 0; 213 } 214 215 #ifdef CONFIG_OF 216 static const struct of_device_id of_ipmi_match[] = { 217 { .type = "ipmi", .compatible = "ipmi-kcs", 218 .data = (void *)(unsigned long) SI_KCS }, 219 { .type = "ipmi", .compatible = "ipmi-smic", 220 .data = (void *)(unsigned long) SI_SMIC }, 221 { .type = "ipmi", .compatible = "ipmi-bt", 222 .data = (void *)(unsigned long) SI_BT }, 223 {}, 224 }; 225 MODULE_DEVICE_TABLE(of, of_ipmi_match); 226 227 static int of_ipmi_probe(struct platform_device *pdev) 228 { 229 const struct of_device_id *match; 230 struct si_sm_io io; 231 struct resource resource; 232 const __be32 *regsize, *regspacing, *regshift; 233 struct device_node *np = pdev->dev.of_node; 234 int ret; 235 int proplen; 236 237 if (!si_tryopenfirmware) 238 return -ENODEV; 239 240 dev_info(&pdev->dev, "probing via device tree\n"); 241 242 match = of_match_device(of_ipmi_match, &pdev->dev); 243 if (!match) 244 return -ENODEV; 245 246 if (!of_device_is_available(np)) 247 return -EINVAL; 248 249 ret = of_address_to_resource(np, 0, &resource); 250 if (ret) { 251 dev_warn(&pdev->dev, "invalid address from OF\n"); 252 return ret; 253 } 254 255 regsize = of_get_property(np, "reg-size", &proplen); 256 if (regsize && proplen != 4) { 257 dev_warn(&pdev->dev, "invalid regsize from OF\n"); 258 return -EINVAL; 259 } 260 261 regspacing = of_get_property(np, "reg-spacing", &proplen); 262 if (regspacing && proplen != 4) { 263 dev_warn(&pdev->dev, "invalid regspacing from OF\n"); 264 return -EINVAL; 265 } 266 267 regshift = of_get_property(np, "reg-shift", &proplen); 268 if (regshift && proplen != 4) { 269 dev_warn(&pdev->dev, "invalid regshift from OF\n"); 270 return -EINVAL; 271 } 272 273 memset(&io, 0, sizeof(io)); 274 io.si_type = (enum si_type) match->data; 275 io.addr_source = SI_DEVICETREE; 276 io.irq_setup = ipmi_std_irq_setup; 277 278 if (resource.flags & IORESOURCE_IO) 279 io.addr_space = IPMI_IO_ADDR_SPACE; 280 else 281 io.addr_space = IPMI_MEM_ADDR_SPACE; 282 283 io.addr_data = resource.start; 284 285 io.regsize = regsize ? be32_to_cpup(regsize) : DEFAULT_REGSIZE; 286 io.regspacing = regspacing ? be32_to_cpup(regspacing) : DEFAULT_REGSPACING; 287 io.regshift = regshift ? be32_to_cpup(regshift) : 0; 288 289 io.irq = irq_of_parse_and_map(pdev->dev.of_node, 0); 290 io.dev = &pdev->dev; 291 292 dev_dbg(&pdev->dev, "addr 0x%lx regsize %d spacing %d irq %d\n", 293 io.addr_data, io.regsize, io.regspacing, io.irq); 294 295 return ipmi_si_add_smi(&io); 296 } 297 #else 298 #define of_ipmi_match NULL 299 static int of_ipmi_probe(struct platform_device *dev) 300 { 301 return -ENODEV; 302 } 303 #endif 304 305 #ifdef CONFIG_ACPI 306 static int find_slave_address(struct si_sm_io *io, int slave_addr) 307 { 308 #ifdef CONFIG_IPMI_DMI_DECODE 309 if (!slave_addr) 310 slave_addr = ipmi_dmi_get_slave_addr(io->si_type, 311 io->addr_space, 312 io->addr_data); 313 #endif 314 315 return slave_addr; 316 } 317 318 static int acpi_ipmi_probe(struct platform_device *pdev) 319 { 320 struct si_sm_io io; 321 acpi_handle handle; 322 acpi_status status; 323 unsigned long long tmp; 324 struct resource *res; 325 int rv = -EINVAL; 326 327 if (!si_tryacpi) 328 return -ENODEV; 329 330 handle = ACPI_HANDLE(&pdev->dev); 331 if (!handle) 332 return -ENODEV; 333 334 memset(&io, 0, sizeof(io)); 335 io.addr_source = SI_ACPI; 336 dev_info(&pdev->dev, "probing via ACPI\n"); 337 338 io.addr_info.acpi_info.acpi_handle = handle; 339 340 /* _IFT tells us the interface type: KCS, BT, etc */ 341 status = acpi_evaluate_integer(handle, "_IFT", NULL, &tmp); 342 if (ACPI_FAILURE(status)) { 343 dev_err(&pdev->dev, 344 "Could not find ACPI IPMI interface type\n"); 345 goto err_free; 346 } 347 348 switch (tmp) { 349 case 1: 350 io.si_type = SI_KCS; 351 break; 352 case 2: 353 io.si_type = SI_SMIC; 354 break; 355 case 3: 356 io.si_type = SI_BT; 357 break; 358 case 4: /* SSIF, just ignore */ 359 rv = -ENODEV; 360 goto err_free; 361 default: 362 dev_info(&pdev->dev, "unknown IPMI type %lld\n", tmp); 363 goto err_free; 364 } 365 366 io.regsize = DEFAULT_REGSIZE; 367 io.regshift = 0; 368 369 res = ipmi_get_info_from_resources(pdev, &io); 370 if (!res) { 371 rv = -EINVAL; 372 goto err_free; 373 } 374 375 /* If _GPE exists, use it; otherwise use standard interrupts */ 376 status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); 377 if (ACPI_SUCCESS(status)) { 378 io.irq = tmp; 379 io.irq_setup = acpi_gpe_irq_setup; 380 } else { 381 int irq = platform_get_irq(pdev, 0); 382 383 if (irq > 0) { 384 io.irq = irq; 385 io.irq_setup = ipmi_std_irq_setup; 386 } 387 } 388 389 io.slave_addr = find_slave_address(&io, io.slave_addr); 390 391 io.dev = &pdev->dev; 392 393 dev_info(io.dev, "%pR regsize %d spacing %d irq %d\n", 394 res, io.regsize, io.regspacing, io.irq); 395 396 return ipmi_si_add_smi(&io); 397 398 err_free: 399 return rv; 400 } 401 402 static const struct acpi_device_id acpi_ipmi_match[] = { 403 { "IPI0001", 0 }, 404 { }, 405 }; 406 MODULE_DEVICE_TABLE(acpi, acpi_ipmi_match); 407 #else 408 static int acpi_ipmi_probe(struct platform_device *dev) 409 { 410 return -ENODEV; 411 } 412 #endif 413 414 static int ipmi_probe(struct platform_device *pdev) 415 { 416 if (pdev->dev.of_node && of_ipmi_probe(pdev) == 0) 417 return 0; 418 419 if (acpi_ipmi_probe(pdev) == 0) 420 return 0; 421 422 return platform_ipmi_probe(pdev); 423 } 424 425 static int ipmi_remove(struct platform_device *pdev) 426 { 427 return ipmi_si_remove_by_dev(&pdev->dev); 428 } 429 430 static int pdev_match_name(struct device *dev, const void *data) 431 { 432 struct platform_device *pdev = to_platform_device(dev); 433 const char *name = data; 434 435 return strcmp(pdev->name, name) == 0; 436 } 437 438 void ipmi_remove_platform_device_by_name(char *name) 439 { 440 struct device *dev; 441 442 while ((dev = bus_find_device(&platform_bus_type, NULL, name, 443 pdev_match_name))) { 444 struct platform_device *pdev = to_platform_device(dev); 445 446 platform_device_unregister(pdev); 447 put_device(dev); 448 } 449 } 450 451 static const struct platform_device_id si_plat_ids[] = { 452 { "dmi-ipmi-si", 0 }, 453 { "hardcode-ipmi-si", 0 }, 454 { "hotmod-ipmi-si", 0 }, 455 { } 456 }; 457 458 struct platform_driver ipmi_platform_driver = { 459 .driver = { 460 .name = DEVICE_NAME, 461 .of_match_table = of_ipmi_match, 462 .acpi_match_table = ACPI_PTR(acpi_ipmi_match), 463 }, 464 .probe = ipmi_probe, 465 .remove = ipmi_remove, 466 .id_table = si_plat_ids 467 }; 468 469 void ipmi_si_platform_init(void) 470 { 471 int rv = platform_driver_register(&ipmi_platform_driver); 472 if (rv) 473 pr_err("Unable to register driver: %d\n", rv); 474 else 475 platform_registered = true; 476 } 477 478 void ipmi_si_platform_shutdown(void) 479 { 480 if (platform_registered) 481 platform_driver_unregister(&ipmi_platform_driver); 482 } 483