1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * ACPI support for Intel Lynxpoint LPSS. 4 * 5 * Copyright (C) 2013, Intel Corporation 6 * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> 7 * Rafael J. Wysocki <rafael.j.wysocki@intel.com> 8 */ 9 10 #include <linux/acpi.h> 11 #include <linux/clkdev.h> 12 #include <linux/clk-provider.h> 13 #include <linux/dmi.h> 14 #include <linux/err.h> 15 #include <linux/io.h> 16 #include <linux/mutex.h> 17 #include <linux/pci.h> 18 #include <linux/platform_device.h> 19 #include <linux/platform_data/x86/clk-lpss.h> 20 #include <linux/platform_data/x86/pmc_atom.h> 21 #include <linux/pm_domain.h> 22 #include <linux/pm_runtime.h> 23 #include <linux/pwm.h> 24 #include <linux/suspend.h> 25 #include <linux/delay.h> 26 27 #include "internal.h" 28 29 ACPI_MODULE_NAME("acpi_lpss"); 30 31 #ifdef CONFIG_X86_INTEL_LPSS 32 33 #include <asm/cpu_device_id.h> 34 #include <asm/intel-family.h> 35 #include <asm/iosf_mbi.h> 36 37 #define LPSS_ADDR(desc) ((unsigned long)&desc) 38 39 #define LPSS_CLK_SIZE 0x04 40 #define LPSS_LTR_SIZE 0x18 41 42 /* Offsets relative to LPSS_PRIVATE_OFFSET */ 43 #define LPSS_CLK_DIVIDER_DEF_MASK (BIT(1) | BIT(16)) 44 #define LPSS_RESETS 0x04 45 #define LPSS_RESETS_RESET_FUNC BIT(0) 46 #define LPSS_RESETS_RESET_APB BIT(1) 47 #define LPSS_GENERAL 0x08 48 #define LPSS_GENERAL_LTR_MODE_SW BIT(2) 49 #define LPSS_GENERAL_UART_RTS_OVRD BIT(3) 50 #define LPSS_SW_LTR 0x10 51 #define LPSS_AUTO_LTR 0x14 52 #define LPSS_LTR_SNOOP_REQ BIT(15) 53 #define LPSS_LTR_SNOOP_MASK 0x0000FFFF 54 #define LPSS_LTR_SNOOP_LAT_1US 0x800 55 #define LPSS_LTR_SNOOP_LAT_32US 0xC00 56 #define LPSS_LTR_SNOOP_LAT_SHIFT 5 57 #define LPSS_LTR_SNOOP_LAT_CUTOFF 3000 58 #define LPSS_LTR_MAX_VAL 0x3FF 59 #define LPSS_TX_INT 0x20 60 #define LPSS_TX_INT_MASK BIT(1) 61 62 #define LPSS_PRV_REG_COUNT 9 63 64 /* LPSS Flags */ 65 #define LPSS_CLK BIT(0) 66 #define LPSS_CLK_GATE BIT(1) 67 #define LPSS_CLK_DIVIDER BIT(2) 68 #define LPSS_LTR BIT(3) 69 #define LPSS_SAVE_CTX BIT(4) 70 #define LPSS_NO_D3_DELAY BIT(5) 71 72 struct lpss_private_data; 73 74 struct lpss_device_desc { 75 unsigned int flags; 76 const char *clk_con_id; 77 unsigned int prv_offset; 78 size_t prv_size_override; 79 struct property_entry *properties; 80 void (*setup)(struct lpss_private_data *pdata); 81 bool resume_from_noirq; 82 }; 83 84 static const struct lpss_device_desc lpss_dma_desc = { 85 .flags = LPSS_CLK, 86 }; 87 88 struct lpss_private_data { 89 struct acpi_device *adev; 90 void __iomem *mmio_base; 91 resource_size_t mmio_size; 92 unsigned int fixed_clk_rate; 93 struct clk *clk; 94 const struct lpss_device_desc *dev_desc; 95 u32 prv_reg_ctx[LPSS_PRV_REG_COUNT]; 96 }; 97 98 /* Devices which need to be in D3 before lpss_iosf_enter_d3_state() proceeds */ 99 static u32 pmc_atom_d3_mask = 0xfe000ffe; 100 101 /* LPSS run time quirks */ 102 static unsigned int lpss_quirks; 103 104 /* 105 * LPSS_QUIRK_ALWAYS_POWER_ON: override power state for LPSS DMA device. 106 * 107 * The LPSS DMA controller has neither _PS0 nor _PS3 method. Moreover 108 * it can be powered off automatically whenever the last LPSS device goes down. 109 * In case of no power any access to the DMA controller will hang the system. 110 * The behaviour is reproduced on some HP laptops based on Intel BayTrail as 111 * well as on ASuS T100TA transformer. 112 * 113 * This quirk overrides power state of entire LPSS island to keep DMA powered 114 * on whenever we have at least one other device in use. 115 */ 116 #define LPSS_QUIRK_ALWAYS_POWER_ON BIT(0) 117 118 /* UART Component Parameter Register */ 119 #define LPSS_UART_CPR 0xF4 120 #define LPSS_UART_CPR_AFCE BIT(4) 121 122 static void lpss_uart_setup(struct lpss_private_data *pdata) 123 { 124 unsigned int offset; 125 u32 val; 126 127 offset = pdata->dev_desc->prv_offset + LPSS_TX_INT; 128 val = readl(pdata->mmio_base + offset); 129 writel(val | LPSS_TX_INT_MASK, pdata->mmio_base + offset); 130 131 val = readl(pdata->mmio_base + LPSS_UART_CPR); 132 if (!(val & LPSS_UART_CPR_AFCE)) { 133 offset = pdata->dev_desc->prv_offset + LPSS_GENERAL; 134 val = readl(pdata->mmio_base + offset); 135 val |= LPSS_GENERAL_UART_RTS_OVRD; 136 writel(val, pdata->mmio_base + offset); 137 } 138 } 139 140 static void lpss_deassert_reset(struct lpss_private_data *pdata) 141 { 142 unsigned int offset; 143 u32 val; 144 145 offset = pdata->dev_desc->prv_offset + LPSS_RESETS; 146 val = readl(pdata->mmio_base + offset); 147 val |= LPSS_RESETS_RESET_APB | LPSS_RESETS_RESET_FUNC; 148 writel(val, pdata->mmio_base + offset); 149 } 150 151 /* 152 * BYT PWM used for backlight control by the i915 driver on systems without 153 * the Crystal Cove PMIC. 154 */ 155 static struct pwm_lookup byt_pwm_lookup[] = { 156 PWM_LOOKUP_WITH_MODULE("80860F09:00", 0, "0000:00:02.0", 157 "pwm_soc_backlight", 0, PWM_POLARITY_NORMAL, 158 "pwm-lpss-platform"), 159 }; 160 161 static void byt_pwm_setup(struct lpss_private_data *pdata) 162 { 163 struct acpi_device *adev = pdata->adev; 164 165 /* Only call pwm_add_table for the first PWM controller */ 166 if (!adev->pnp.unique_id || strcmp(adev->pnp.unique_id, "1")) 167 return; 168 169 pwm_add_table(byt_pwm_lookup, ARRAY_SIZE(byt_pwm_lookup)); 170 } 171 172 #define LPSS_I2C_ENABLE 0x6c 173 174 static void byt_i2c_setup(struct lpss_private_data *pdata) 175 { 176 const char *uid_str = acpi_device_uid(pdata->adev); 177 acpi_handle handle = pdata->adev->handle; 178 unsigned long long shared_host = 0; 179 acpi_status status; 180 long uid = 0; 181 182 /* Expected to always be true, but better safe then sorry */ 183 if (uid_str) 184 uid = simple_strtol(uid_str, NULL, 10); 185 186 /* Detect I2C bus shared with PUNIT and ignore its d3 status */ 187 status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host); 188 if (ACPI_SUCCESS(status) && shared_host && uid) 189 pmc_atom_d3_mask &= ~(BIT_LPSS2_F1_I2C1 << (uid - 1)); 190 191 lpss_deassert_reset(pdata); 192 193 if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset)) 194 pdata->fixed_clk_rate = 133000000; 195 196 writel(0, pdata->mmio_base + LPSS_I2C_ENABLE); 197 } 198 199 /* BSW PWM used for backlight control by the i915 driver */ 200 static struct pwm_lookup bsw_pwm_lookup[] = { 201 PWM_LOOKUP_WITH_MODULE("80862288:00", 0, "0000:00:02.0", 202 "pwm_soc_backlight", 0, PWM_POLARITY_NORMAL, 203 "pwm-lpss-platform"), 204 }; 205 206 static void bsw_pwm_setup(struct lpss_private_data *pdata) 207 { 208 struct acpi_device *adev = pdata->adev; 209 210 /* Only call pwm_add_table for the first PWM controller */ 211 if (!adev->pnp.unique_id || strcmp(adev->pnp.unique_id, "1")) 212 return; 213 214 pwm_add_table(bsw_pwm_lookup, ARRAY_SIZE(bsw_pwm_lookup)); 215 } 216 217 static const struct lpss_device_desc lpt_dev_desc = { 218 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR 219 | LPSS_SAVE_CTX, 220 .prv_offset = 0x800, 221 }; 222 223 static const struct lpss_device_desc lpt_i2c_dev_desc = { 224 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_LTR | LPSS_SAVE_CTX, 225 .prv_offset = 0x800, 226 }; 227 228 static struct property_entry uart_properties[] = { 229 PROPERTY_ENTRY_U32("reg-io-width", 4), 230 PROPERTY_ENTRY_U32("reg-shift", 2), 231 PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"), 232 { }, 233 }; 234 235 static const struct lpss_device_desc lpt_uart_dev_desc = { 236 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR 237 | LPSS_SAVE_CTX, 238 .clk_con_id = "baudclk", 239 .prv_offset = 0x800, 240 .setup = lpss_uart_setup, 241 .properties = uart_properties, 242 }; 243 244 static const struct lpss_device_desc lpt_sdio_dev_desc = { 245 .flags = LPSS_LTR, 246 .prv_offset = 0x1000, 247 .prv_size_override = 0x1018, 248 }; 249 250 static const struct lpss_device_desc byt_pwm_dev_desc = { 251 .flags = LPSS_SAVE_CTX, 252 .prv_offset = 0x800, 253 .setup = byt_pwm_setup, 254 }; 255 256 static const struct lpss_device_desc bsw_pwm_dev_desc = { 257 .flags = LPSS_SAVE_CTX | LPSS_NO_D3_DELAY, 258 .prv_offset = 0x800, 259 .setup = bsw_pwm_setup, 260 }; 261 262 static const struct lpss_device_desc byt_uart_dev_desc = { 263 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX, 264 .clk_con_id = "baudclk", 265 .prv_offset = 0x800, 266 .setup = lpss_uart_setup, 267 .properties = uart_properties, 268 }; 269 270 static const struct lpss_device_desc bsw_uart_dev_desc = { 271 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX 272 | LPSS_NO_D3_DELAY, 273 .clk_con_id = "baudclk", 274 .prv_offset = 0x800, 275 .setup = lpss_uart_setup, 276 .properties = uart_properties, 277 }; 278 279 static const struct lpss_device_desc byt_spi_dev_desc = { 280 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX, 281 .prv_offset = 0x400, 282 }; 283 284 static const struct lpss_device_desc byt_sdio_dev_desc = { 285 .flags = LPSS_CLK, 286 }; 287 288 static const struct lpss_device_desc byt_i2c_dev_desc = { 289 .flags = LPSS_CLK | LPSS_SAVE_CTX, 290 .prv_offset = 0x800, 291 .setup = byt_i2c_setup, 292 .resume_from_noirq = true, 293 }; 294 295 static const struct lpss_device_desc bsw_i2c_dev_desc = { 296 .flags = LPSS_CLK | LPSS_SAVE_CTX | LPSS_NO_D3_DELAY, 297 .prv_offset = 0x800, 298 .setup = byt_i2c_setup, 299 .resume_from_noirq = true, 300 }; 301 302 static const struct lpss_device_desc bsw_spi_dev_desc = { 303 .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX 304 | LPSS_NO_D3_DELAY, 305 .prv_offset = 0x400, 306 .setup = lpss_deassert_reset, 307 }; 308 309 static const struct x86_cpu_id lpss_cpu_ids[] = { 310 X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT, NULL), 311 X86_MATCH_INTEL_FAM6_MODEL(ATOM_AIRMONT, NULL), 312 {} 313 }; 314 315 #else 316 317 #define LPSS_ADDR(desc) (0UL) 318 319 #endif /* CONFIG_X86_INTEL_LPSS */ 320 321 static const struct acpi_device_id acpi_lpss_device_ids[] = { 322 /* Generic LPSS devices */ 323 { "INTL9C60", LPSS_ADDR(lpss_dma_desc) }, 324 325 /* Lynxpoint LPSS devices */ 326 { "INT33C0", LPSS_ADDR(lpt_dev_desc) }, 327 { "INT33C1", LPSS_ADDR(lpt_dev_desc) }, 328 { "INT33C2", LPSS_ADDR(lpt_i2c_dev_desc) }, 329 { "INT33C3", LPSS_ADDR(lpt_i2c_dev_desc) }, 330 { "INT33C4", LPSS_ADDR(lpt_uart_dev_desc) }, 331 { "INT33C5", LPSS_ADDR(lpt_uart_dev_desc) }, 332 { "INT33C6", LPSS_ADDR(lpt_sdio_dev_desc) }, 333 { "INT33C7", }, 334 335 /* BayTrail LPSS devices */ 336 { "80860F09", LPSS_ADDR(byt_pwm_dev_desc) }, 337 { "80860F0A", LPSS_ADDR(byt_uart_dev_desc) }, 338 { "80860F0E", LPSS_ADDR(byt_spi_dev_desc) }, 339 { "80860F14", LPSS_ADDR(byt_sdio_dev_desc) }, 340 { "80860F41", LPSS_ADDR(byt_i2c_dev_desc) }, 341 { "INT33B2", }, 342 { "INT33FC", }, 343 344 /* Braswell LPSS devices */ 345 { "80862286", LPSS_ADDR(lpss_dma_desc) }, 346 { "80862288", LPSS_ADDR(bsw_pwm_dev_desc) }, 347 { "8086228A", LPSS_ADDR(bsw_uart_dev_desc) }, 348 { "8086228E", LPSS_ADDR(bsw_spi_dev_desc) }, 349 { "808622C0", LPSS_ADDR(lpss_dma_desc) }, 350 { "808622C1", LPSS_ADDR(bsw_i2c_dev_desc) }, 351 352 /* Broadwell LPSS devices */ 353 { "INT3430", LPSS_ADDR(lpt_dev_desc) }, 354 { "INT3431", LPSS_ADDR(lpt_dev_desc) }, 355 { "INT3432", LPSS_ADDR(lpt_i2c_dev_desc) }, 356 { "INT3433", LPSS_ADDR(lpt_i2c_dev_desc) }, 357 { "INT3434", LPSS_ADDR(lpt_uart_dev_desc) }, 358 { "INT3435", LPSS_ADDR(lpt_uart_dev_desc) }, 359 { "INT3436", LPSS_ADDR(lpt_sdio_dev_desc) }, 360 { "INT3437", }, 361 362 /* Wildcat Point LPSS devices */ 363 { "INT3438", LPSS_ADDR(lpt_dev_desc) }, 364 365 { } 366 }; 367 368 #ifdef CONFIG_X86_INTEL_LPSS 369 370 static int is_memory(struct acpi_resource *res, void *not_used) 371 { 372 struct resource r; 373 return !acpi_dev_resource_memory(res, &r); 374 } 375 376 /* LPSS main clock device. */ 377 static struct platform_device *lpss_clk_dev; 378 379 static inline void lpt_register_clock_device(void) 380 { 381 lpss_clk_dev = platform_device_register_simple("clk-lpt", -1, NULL, 0); 382 } 383 384 static int register_device_clock(struct acpi_device *adev, 385 struct lpss_private_data *pdata) 386 { 387 const struct lpss_device_desc *dev_desc = pdata->dev_desc; 388 const char *devname = dev_name(&adev->dev); 389 struct clk *clk; 390 struct lpss_clk_data *clk_data; 391 const char *parent, *clk_name; 392 void __iomem *prv_base; 393 394 if (!lpss_clk_dev) 395 lpt_register_clock_device(); 396 397 clk_data = platform_get_drvdata(lpss_clk_dev); 398 if (!clk_data) 399 return -ENODEV; 400 clk = clk_data->clk; 401 402 if (!pdata->mmio_base 403 || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE) 404 return -ENODATA; 405 406 parent = clk_data->name; 407 prv_base = pdata->mmio_base + dev_desc->prv_offset; 408 409 if (pdata->fixed_clk_rate) { 410 clk = clk_register_fixed_rate(NULL, devname, parent, 0, 411 pdata->fixed_clk_rate); 412 goto out; 413 } 414 415 if (dev_desc->flags & LPSS_CLK_GATE) { 416 clk = clk_register_gate(NULL, devname, parent, 0, 417 prv_base, 0, 0, NULL); 418 parent = devname; 419 } 420 421 if (dev_desc->flags & LPSS_CLK_DIVIDER) { 422 /* Prevent division by zero */ 423 if (!readl(prv_base)) 424 writel(LPSS_CLK_DIVIDER_DEF_MASK, prv_base); 425 426 clk_name = kasprintf(GFP_KERNEL, "%s-div", devname); 427 if (!clk_name) 428 return -ENOMEM; 429 clk = clk_register_fractional_divider(NULL, clk_name, parent, 430 0, prv_base, 431 1, 15, 16, 15, 0, NULL); 432 parent = clk_name; 433 434 clk_name = kasprintf(GFP_KERNEL, "%s-update", devname); 435 if (!clk_name) { 436 kfree(parent); 437 return -ENOMEM; 438 } 439 clk = clk_register_gate(NULL, clk_name, parent, 440 CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE, 441 prv_base, 31, 0, NULL); 442 kfree(parent); 443 kfree(clk_name); 444 } 445 out: 446 if (IS_ERR(clk)) 447 return PTR_ERR(clk); 448 449 pdata->clk = clk; 450 clk_register_clkdev(clk, dev_desc->clk_con_id, devname); 451 return 0; 452 } 453 454 struct lpss_device_links { 455 const char *supplier_hid; 456 const char *supplier_uid; 457 const char *consumer_hid; 458 const char *consumer_uid; 459 u32 flags; 460 const struct dmi_system_id *dep_missing_ids; 461 }; 462 463 /* Please keep this list sorted alphabetically by vendor and model */ 464 static const struct dmi_system_id i2c1_dep_missing_dmi_ids[] = { 465 { 466 .matches = { 467 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), 468 DMI_MATCH(DMI_PRODUCT_NAME, "T200TA"), 469 }, 470 }, 471 {} 472 }; 473 474 /* 475 * The _DEP method is used to identify dependencies but instead of creating 476 * device links for every handle in _DEP, only links in the following list are 477 * created. That is necessary because, in the general case, _DEP can refer to 478 * devices that might not have drivers, or that are on different buses, or where 479 * the supplier is not enumerated until after the consumer is probed. 480 */ 481 static const struct lpss_device_links lpss_device_links[] = { 482 /* CHT External sdcard slot controller depends on PMIC I2C ctrl */ 483 {"808622C1", "7", "80860F14", "3", DL_FLAG_PM_RUNTIME}, 484 /* CHT iGPU depends on PMIC I2C controller */ 485 {"808622C1", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME}, 486 /* BYT iGPU depends on the Embedded Controller I2C controller (UID 1) */ 487 {"80860F41", "1", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME, 488 i2c1_dep_missing_dmi_ids}, 489 /* BYT CR iGPU depends on PMIC I2C controller (UID 5 on CR) */ 490 {"80860F41", "5", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME}, 491 /* BYT iGPU depends on PMIC I2C controller (UID 7 on non CR) */ 492 {"80860F41", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME}, 493 }; 494 495 static bool acpi_lpss_is_supplier(struct acpi_device *adev, 496 const struct lpss_device_links *link) 497 { 498 return acpi_dev_hid_uid_match(adev, link->supplier_hid, link->supplier_uid); 499 } 500 501 static bool acpi_lpss_is_consumer(struct acpi_device *adev, 502 const struct lpss_device_links *link) 503 { 504 return acpi_dev_hid_uid_match(adev, link->consumer_hid, link->consumer_uid); 505 } 506 507 struct hid_uid { 508 const char *hid; 509 const char *uid; 510 }; 511 512 static int match_hid_uid(struct device *dev, const void *data) 513 { 514 struct acpi_device *adev = ACPI_COMPANION(dev); 515 const struct hid_uid *id = data; 516 517 if (!adev) 518 return 0; 519 520 return acpi_dev_hid_uid_match(adev, id->hid, id->uid); 521 } 522 523 static struct device *acpi_lpss_find_device(const char *hid, const char *uid) 524 { 525 struct device *dev; 526 527 struct hid_uid data = { 528 .hid = hid, 529 .uid = uid, 530 }; 531 532 dev = bus_find_device(&platform_bus_type, NULL, &data, match_hid_uid); 533 if (dev) 534 return dev; 535 536 return bus_find_device(&pci_bus_type, NULL, &data, match_hid_uid); 537 } 538 539 static bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle) 540 { 541 struct acpi_handle_list dep_devices; 542 acpi_status status; 543 int i; 544 545 if (!acpi_has_method(adev->handle, "_DEP")) 546 return false; 547 548 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL, 549 &dep_devices); 550 if (ACPI_FAILURE(status)) { 551 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n"); 552 return false; 553 } 554 555 for (i = 0; i < dep_devices.count; i++) { 556 if (dep_devices.handles[i] == handle) 557 return true; 558 } 559 560 return false; 561 } 562 563 static void acpi_lpss_link_consumer(struct device *dev1, 564 const struct lpss_device_links *link) 565 { 566 struct device *dev2; 567 568 dev2 = acpi_lpss_find_device(link->consumer_hid, link->consumer_uid); 569 if (!dev2) 570 return; 571 572 if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids)) 573 || acpi_lpss_dep(ACPI_COMPANION(dev2), ACPI_HANDLE(dev1))) 574 device_link_add(dev2, dev1, link->flags); 575 576 put_device(dev2); 577 } 578 579 static void acpi_lpss_link_supplier(struct device *dev1, 580 const struct lpss_device_links *link) 581 { 582 struct device *dev2; 583 584 dev2 = acpi_lpss_find_device(link->supplier_hid, link->supplier_uid); 585 if (!dev2) 586 return; 587 588 if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids)) 589 || acpi_lpss_dep(ACPI_COMPANION(dev1), ACPI_HANDLE(dev2))) 590 device_link_add(dev1, dev2, link->flags); 591 592 put_device(dev2); 593 } 594 595 static void acpi_lpss_create_device_links(struct acpi_device *adev, 596 struct platform_device *pdev) 597 { 598 int i; 599 600 for (i = 0; i < ARRAY_SIZE(lpss_device_links); i++) { 601 const struct lpss_device_links *link = &lpss_device_links[i]; 602 603 if (acpi_lpss_is_supplier(adev, link)) 604 acpi_lpss_link_consumer(&pdev->dev, link); 605 606 if (acpi_lpss_is_consumer(adev, link)) 607 acpi_lpss_link_supplier(&pdev->dev, link); 608 } 609 } 610 611 static int acpi_lpss_create_device(struct acpi_device *adev, 612 const struct acpi_device_id *id) 613 { 614 const struct lpss_device_desc *dev_desc; 615 struct lpss_private_data *pdata; 616 struct resource_entry *rentry; 617 struct list_head resource_list; 618 struct platform_device *pdev; 619 int ret; 620 621 dev_desc = (const struct lpss_device_desc *)id->driver_data; 622 if (!dev_desc) { 623 pdev = acpi_create_platform_device(adev, NULL); 624 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1; 625 } 626 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); 627 if (!pdata) 628 return -ENOMEM; 629 630 INIT_LIST_HEAD(&resource_list); 631 ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL); 632 if (ret < 0) 633 goto err_out; 634 635 list_for_each_entry(rentry, &resource_list, node) 636 if (resource_type(rentry->res) == IORESOURCE_MEM) { 637 if (dev_desc->prv_size_override) 638 pdata->mmio_size = dev_desc->prv_size_override; 639 else 640 pdata->mmio_size = resource_size(rentry->res); 641 pdata->mmio_base = ioremap(rentry->res->start, 642 pdata->mmio_size); 643 break; 644 } 645 646 acpi_dev_free_resource_list(&resource_list); 647 648 if (!pdata->mmio_base) { 649 /* Avoid acpi_bus_attach() instantiating a pdev for this dev. */ 650 adev->pnp.type.platform_id = 0; 651 /* Skip the device, but continue the namespace scan. */ 652 ret = 0; 653 goto err_out; 654 } 655 656 pdata->adev = adev; 657 pdata->dev_desc = dev_desc; 658 659 if (dev_desc->setup) 660 dev_desc->setup(pdata); 661 662 if (dev_desc->flags & LPSS_CLK) { 663 ret = register_device_clock(adev, pdata); 664 if (ret) { 665 /* Skip the device, but continue the namespace scan. */ 666 ret = 0; 667 goto err_out; 668 } 669 } 670 671 /* 672 * This works around a known issue in ACPI tables where LPSS devices 673 * have _PS0 and _PS3 without _PSC (and no power resources), so 674 * acpi_bus_init_power() will assume that the BIOS has put them into D0. 675 */ 676 acpi_device_fix_up_power(adev); 677 678 adev->driver_data = pdata; 679 pdev = acpi_create_platform_device(adev, dev_desc->properties); 680 if (!IS_ERR_OR_NULL(pdev)) { 681 acpi_lpss_create_device_links(adev, pdev); 682 return 1; 683 } 684 685 ret = PTR_ERR(pdev); 686 adev->driver_data = NULL; 687 688 err_out: 689 kfree(pdata); 690 return ret; 691 } 692 693 static u32 __lpss_reg_read(struct lpss_private_data *pdata, unsigned int reg) 694 { 695 return readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg); 696 } 697 698 static void __lpss_reg_write(u32 val, struct lpss_private_data *pdata, 699 unsigned int reg) 700 { 701 writel(val, pdata->mmio_base + pdata->dev_desc->prv_offset + reg); 702 } 703 704 static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val) 705 { 706 struct acpi_device *adev; 707 struct lpss_private_data *pdata; 708 unsigned long flags; 709 int ret; 710 711 ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev); 712 if (WARN_ON(ret)) 713 return ret; 714 715 spin_lock_irqsave(&dev->power.lock, flags); 716 if (pm_runtime_suspended(dev)) { 717 ret = -EAGAIN; 718 goto out; 719 } 720 pdata = acpi_driver_data(adev); 721 if (WARN_ON(!pdata || !pdata->mmio_base)) { 722 ret = -ENODEV; 723 goto out; 724 } 725 *val = __lpss_reg_read(pdata, reg); 726 727 out: 728 spin_unlock_irqrestore(&dev->power.lock, flags); 729 return ret; 730 } 731 732 static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr, 733 char *buf) 734 { 735 u32 ltr_value = 0; 736 unsigned int reg; 737 int ret; 738 739 reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR; 740 ret = lpss_reg_read(dev, reg, <r_value); 741 if (ret) 742 return ret; 743 744 return snprintf(buf, PAGE_SIZE, "%08x\n", ltr_value); 745 } 746 747 static ssize_t lpss_ltr_mode_show(struct device *dev, 748 struct device_attribute *attr, char *buf) 749 { 750 u32 ltr_mode = 0; 751 char *outstr; 752 int ret; 753 754 ret = lpss_reg_read(dev, LPSS_GENERAL, <r_mode); 755 if (ret) 756 return ret; 757 758 outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto"; 759 return sprintf(buf, "%s\n", outstr); 760 } 761 762 static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL); 763 static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL); 764 static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL); 765 766 static struct attribute *lpss_attrs[] = { 767 &dev_attr_auto_ltr.attr, 768 &dev_attr_sw_ltr.attr, 769 &dev_attr_ltr_mode.attr, 770 NULL, 771 }; 772 773 static const struct attribute_group lpss_attr_group = { 774 .attrs = lpss_attrs, 775 .name = "lpss_ltr", 776 }; 777 778 static void acpi_lpss_set_ltr(struct device *dev, s32 val) 779 { 780 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 781 u32 ltr_mode, ltr_val; 782 783 ltr_mode = __lpss_reg_read(pdata, LPSS_GENERAL); 784 if (val < 0) { 785 if (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) { 786 ltr_mode &= ~LPSS_GENERAL_LTR_MODE_SW; 787 __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL); 788 } 789 return; 790 } 791 ltr_val = __lpss_reg_read(pdata, LPSS_SW_LTR) & ~LPSS_LTR_SNOOP_MASK; 792 if (val >= LPSS_LTR_SNOOP_LAT_CUTOFF) { 793 ltr_val |= LPSS_LTR_SNOOP_LAT_32US; 794 val = LPSS_LTR_MAX_VAL; 795 } else if (val > LPSS_LTR_MAX_VAL) { 796 ltr_val |= LPSS_LTR_SNOOP_LAT_32US | LPSS_LTR_SNOOP_REQ; 797 val >>= LPSS_LTR_SNOOP_LAT_SHIFT; 798 } else { 799 ltr_val |= LPSS_LTR_SNOOP_LAT_1US | LPSS_LTR_SNOOP_REQ; 800 } 801 ltr_val |= val; 802 __lpss_reg_write(ltr_val, pdata, LPSS_SW_LTR); 803 if (!(ltr_mode & LPSS_GENERAL_LTR_MODE_SW)) { 804 ltr_mode |= LPSS_GENERAL_LTR_MODE_SW; 805 __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL); 806 } 807 } 808 809 #ifdef CONFIG_PM 810 /** 811 * acpi_lpss_save_ctx() - Save the private registers of LPSS device 812 * @dev: LPSS device 813 * @pdata: pointer to the private data of the LPSS device 814 * 815 * Most LPSS devices have private registers which may loose their context when 816 * the device is powered down. acpi_lpss_save_ctx() saves those registers into 817 * prv_reg_ctx array. 818 */ 819 static void acpi_lpss_save_ctx(struct device *dev, 820 struct lpss_private_data *pdata) 821 { 822 unsigned int i; 823 824 for (i = 0; i < LPSS_PRV_REG_COUNT; i++) { 825 unsigned long offset = i * sizeof(u32); 826 827 pdata->prv_reg_ctx[i] = __lpss_reg_read(pdata, offset); 828 dev_dbg(dev, "saving 0x%08x from LPSS reg at offset 0x%02lx\n", 829 pdata->prv_reg_ctx[i], offset); 830 } 831 } 832 833 /** 834 * acpi_lpss_restore_ctx() - Restore the private registers of LPSS device 835 * @dev: LPSS device 836 * @pdata: pointer to the private data of the LPSS device 837 * 838 * Restores the registers that were previously stored with acpi_lpss_save_ctx(). 839 */ 840 static void acpi_lpss_restore_ctx(struct device *dev, 841 struct lpss_private_data *pdata) 842 { 843 unsigned int i; 844 845 for (i = 0; i < LPSS_PRV_REG_COUNT; i++) { 846 unsigned long offset = i * sizeof(u32); 847 848 __lpss_reg_write(pdata->prv_reg_ctx[i], pdata, offset); 849 dev_dbg(dev, "restoring 0x%08x to LPSS reg at offset 0x%02lx\n", 850 pdata->prv_reg_ctx[i], offset); 851 } 852 } 853 854 static void acpi_lpss_d3_to_d0_delay(struct lpss_private_data *pdata) 855 { 856 /* 857 * The following delay is needed or the subsequent write operations may 858 * fail. The LPSS devices are actually PCI devices and the PCI spec 859 * expects 10ms delay before the device can be accessed after D3 to D0 860 * transition. However some platforms like BSW does not need this delay. 861 */ 862 unsigned int delay = 10; /* default 10ms delay */ 863 864 if (pdata->dev_desc->flags & LPSS_NO_D3_DELAY) 865 delay = 0; 866 867 msleep(delay); 868 } 869 870 static int acpi_lpss_activate(struct device *dev) 871 { 872 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 873 int ret; 874 875 ret = acpi_dev_resume(dev); 876 if (ret) 877 return ret; 878 879 acpi_lpss_d3_to_d0_delay(pdata); 880 881 /* 882 * This is called only on ->probe() stage where a device is either in 883 * known state defined by BIOS or most likely powered off. Due to this 884 * we have to deassert reset line to be sure that ->probe() will 885 * recognize the device. 886 */ 887 if (pdata->dev_desc->flags & LPSS_SAVE_CTX) 888 lpss_deassert_reset(pdata); 889 890 return 0; 891 } 892 893 static void acpi_lpss_dismiss(struct device *dev) 894 { 895 acpi_dev_suspend(dev, false); 896 } 897 898 /* IOSF SB for LPSS island */ 899 #define LPSS_IOSF_UNIT_LPIOEP 0xA0 900 #define LPSS_IOSF_UNIT_LPIO1 0xAB 901 #define LPSS_IOSF_UNIT_LPIO2 0xAC 902 903 #define LPSS_IOSF_PMCSR 0x84 904 #define LPSS_PMCSR_D0 0 905 #define LPSS_PMCSR_D3hot 3 906 #define LPSS_PMCSR_Dx_MASK GENMASK(1, 0) 907 908 #define LPSS_IOSF_GPIODEF0 0x154 909 #define LPSS_GPIODEF0_DMA1_D3 BIT(2) 910 #define LPSS_GPIODEF0_DMA2_D3 BIT(3) 911 #define LPSS_GPIODEF0_DMA_D3_MASK GENMASK(3, 2) 912 #define LPSS_GPIODEF0_DMA_LLP BIT(13) 913 914 static DEFINE_MUTEX(lpss_iosf_mutex); 915 static bool lpss_iosf_d3_entered = true; 916 917 static void lpss_iosf_enter_d3_state(void) 918 { 919 u32 value1 = 0; 920 u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK | LPSS_GPIODEF0_DMA_LLP; 921 u32 value2 = LPSS_PMCSR_D3hot; 922 u32 mask2 = LPSS_PMCSR_Dx_MASK; 923 /* 924 * PMC provides an information about actual status of the LPSS devices. 925 * Here we read the values related to LPSS power island, i.e. LPSS 926 * devices, excluding both LPSS DMA controllers, along with SCC domain. 927 */ 928 u32 func_dis, d3_sts_0, pmc_status; 929 int ret; 930 931 ret = pmc_atom_read(PMC_FUNC_DIS, &func_dis); 932 if (ret) 933 return; 934 935 mutex_lock(&lpss_iosf_mutex); 936 937 ret = pmc_atom_read(PMC_D3_STS_0, &d3_sts_0); 938 if (ret) 939 goto exit; 940 941 /* 942 * Get the status of entire LPSS power island per device basis. 943 * Shutdown both LPSS DMA controllers if and only if all other devices 944 * are already in D3hot. 945 */ 946 pmc_status = (~(d3_sts_0 | func_dis)) & pmc_atom_d3_mask; 947 if (pmc_status) 948 goto exit; 949 950 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE, 951 LPSS_IOSF_PMCSR, value2, mask2); 952 953 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2, MBI_CFG_WRITE, 954 LPSS_IOSF_PMCSR, value2, mask2); 955 956 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE, 957 LPSS_IOSF_GPIODEF0, value1, mask1); 958 959 lpss_iosf_d3_entered = true; 960 961 exit: 962 mutex_unlock(&lpss_iosf_mutex); 963 } 964 965 static void lpss_iosf_exit_d3_state(void) 966 { 967 u32 value1 = LPSS_GPIODEF0_DMA1_D3 | LPSS_GPIODEF0_DMA2_D3 | 968 LPSS_GPIODEF0_DMA_LLP; 969 u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK | LPSS_GPIODEF0_DMA_LLP; 970 u32 value2 = LPSS_PMCSR_D0; 971 u32 mask2 = LPSS_PMCSR_Dx_MASK; 972 973 mutex_lock(&lpss_iosf_mutex); 974 975 if (!lpss_iosf_d3_entered) 976 goto exit; 977 978 lpss_iosf_d3_entered = false; 979 980 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE, 981 LPSS_IOSF_GPIODEF0, value1, mask1); 982 983 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2, MBI_CFG_WRITE, 984 LPSS_IOSF_PMCSR, value2, mask2); 985 986 iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE, 987 LPSS_IOSF_PMCSR, value2, mask2); 988 989 exit: 990 mutex_unlock(&lpss_iosf_mutex); 991 } 992 993 static int acpi_lpss_suspend(struct device *dev, bool wakeup) 994 { 995 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 996 int ret; 997 998 if (pdata->dev_desc->flags & LPSS_SAVE_CTX) 999 acpi_lpss_save_ctx(dev, pdata); 1000 1001 ret = acpi_dev_suspend(dev, wakeup); 1002 1003 /* 1004 * This call must be last in the sequence, otherwise PMC will return 1005 * wrong status for devices being about to be powered off. See 1006 * lpss_iosf_enter_d3_state() for further information. 1007 */ 1008 if (acpi_target_system_state() == ACPI_STATE_S0 && 1009 lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available()) 1010 lpss_iosf_enter_d3_state(); 1011 1012 return ret; 1013 } 1014 1015 static int acpi_lpss_resume(struct device *dev) 1016 { 1017 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 1018 int ret; 1019 1020 /* 1021 * This call is kept first to be in symmetry with 1022 * acpi_lpss_runtime_suspend() one. 1023 */ 1024 if (lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available()) 1025 lpss_iosf_exit_d3_state(); 1026 1027 ret = acpi_dev_resume(dev); 1028 if (ret) 1029 return ret; 1030 1031 acpi_lpss_d3_to_d0_delay(pdata); 1032 1033 if (pdata->dev_desc->flags & LPSS_SAVE_CTX) 1034 acpi_lpss_restore_ctx(dev, pdata); 1035 1036 return 0; 1037 } 1038 1039 #ifdef CONFIG_PM_SLEEP 1040 static int acpi_lpss_do_suspend_late(struct device *dev) 1041 { 1042 int ret; 1043 1044 if (dev_pm_skip_suspend(dev)) 1045 return 0; 1046 1047 ret = pm_generic_suspend_late(dev); 1048 return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev)); 1049 } 1050 1051 static int acpi_lpss_suspend_late(struct device *dev) 1052 { 1053 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 1054 1055 if (pdata->dev_desc->resume_from_noirq) 1056 return 0; 1057 1058 return acpi_lpss_do_suspend_late(dev); 1059 } 1060 1061 static int acpi_lpss_suspend_noirq(struct device *dev) 1062 { 1063 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 1064 int ret; 1065 1066 if (pdata->dev_desc->resume_from_noirq) { 1067 /* 1068 * The driver's ->suspend_late callback will be invoked by 1069 * acpi_lpss_do_suspend_late(), with the assumption that the 1070 * driver really wanted to run that code in ->suspend_noirq, but 1071 * it could not run after acpi_dev_suspend() and the driver 1072 * expected the latter to be called in the "late" phase. 1073 */ 1074 ret = acpi_lpss_do_suspend_late(dev); 1075 if (ret) 1076 return ret; 1077 } 1078 1079 return acpi_subsys_suspend_noirq(dev); 1080 } 1081 1082 static int acpi_lpss_do_resume_early(struct device *dev) 1083 { 1084 int ret = acpi_lpss_resume(dev); 1085 1086 return ret ? ret : pm_generic_resume_early(dev); 1087 } 1088 1089 static int acpi_lpss_resume_early(struct device *dev) 1090 { 1091 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 1092 1093 if (pdata->dev_desc->resume_from_noirq) 1094 return 0; 1095 1096 if (dev_pm_skip_resume(dev)) 1097 return 0; 1098 1099 return acpi_lpss_do_resume_early(dev); 1100 } 1101 1102 static int acpi_lpss_resume_noirq(struct device *dev) 1103 { 1104 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 1105 int ret; 1106 1107 /* Follow acpi_subsys_resume_noirq(). */ 1108 if (dev_pm_skip_resume(dev)) 1109 return 0; 1110 1111 ret = pm_generic_resume_noirq(dev); 1112 if (ret) 1113 return ret; 1114 1115 if (!pdata->dev_desc->resume_from_noirq) 1116 return 0; 1117 1118 /* 1119 * The driver's ->resume_early callback will be invoked by 1120 * acpi_lpss_do_resume_early(), with the assumption that the driver 1121 * really wanted to run that code in ->resume_noirq, but it could not 1122 * run before acpi_dev_resume() and the driver expected the latter to be 1123 * called in the "early" phase. 1124 */ 1125 return acpi_lpss_do_resume_early(dev); 1126 } 1127 1128 static int acpi_lpss_do_restore_early(struct device *dev) 1129 { 1130 int ret = acpi_lpss_resume(dev); 1131 1132 return ret ? ret : pm_generic_restore_early(dev); 1133 } 1134 1135 static int acpi_lpss_restore_early(struct device *dev) 1136 { 1137 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 1138 1139 if (pdata->dev_desc->resume_from_noirq) 1140 return 0; 1141 1142 return acpi_lpss_do_restore_early(dev); 1143 } 1144 1145 static int acpi_lpss_restore_noirq(struct device *dev) 1146 { 1147 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 1148 int ret; 1149 1150 ret = pm_generic_restore_noirq(dev); 1151 if (ret) 1152 return ret; 1153 1154 if (!pdata->dev_desc->resume_from_noirq) 1155 return 0; 1156 1157 /* This is analogous to what happens in acpi_lpss_resume_noirq(). */ 1158 return acpi_lpss_do_restore_early(dev); 1159 } 1160 1161 static int acpi_lpss_do_poweroff_late(struct device *dev) 1162 { 1163 int ret = pm_generic_poweroff_late(dev); 1164 1165 return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev)); 1166 } 1167 1168 static int acpi_lpss_poweroff_late(struct device *dev) 1169 { 1170 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 1171 1172 if (dev_pm_skip_suspend(dev)) 1173 return 0; 1174 1175 if (pdata->dev_desc->resume_from_noirq) 1176 return 0; 1177 1178 return acpi_lpss_do_poweroff_late(dev); 1179 } 1180 1181 static int acpi_lpss_poweroff_noirq(struct device *dev) 1182 { 1183 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 1184 1185 if (dev_pm_skip_suspend(dev)) 1186 return 0; 1187 1188 if (pdata->dev_desc->resume_from_noirq) { 1189 /* This is analogous to the acpi_lpss_suspend_noirq() case. */ 1190 int ret = acpi_lpss_do_poweroff_late(dev); 1191 if (ret) 1192 return ret; 1193 } 1194 1195 return pm_generic_poweroff_noirq(dev); 1196 } 1197 #endif /* CONFIG_PM_SLEEP */ 1198 1199 static int acpi_lpss_runtime_suspend(struct device *dev) 1200 { 1201 int ret = pm_generic_runtime_suspend(dev); 1202 1203 return ret ? ret : acpi_lpss_suspend(dev, true); 1204 } 1205 1206 static int acpi_lpss_runtime_resume(struct device *dev) 1207 { 1208 int ret = acpi_lpss_resume(dev); 1209 1210 return ret ? ret : pm_generic_runtime_resume(dev); 1211 } 1212 #endif /* CONFIG_PM */ 1213 1214 static struct dev_pm_domain acpi_lpss_pm_domain = { 1215 #ifdef CONFIG_PM 1216 .activate = acpi_lpss_activate, 1217 .dismiss = acpi_lpss_dismiss, 1218 #endif 1219 .ops = { 1220 #ifdef CONFIG_PM 1221 #ifdef CONFIG_PM_SLEEP 1222 .prepare = acpi_subsys_prepare, 1223 .complete = acpi_subsys_complete, 1224 .suspend = acpi_subsys_suspend, 1225 .suspend_late = acpi_lpss_suspend_late, 1226 .suspend_noirq = acpi_lpss_suspend_noirq, 1227 .resume_noirq = acpi_lpss_resume_noirq, 1228 .resume_early = acpi_lpss_resume_early, 1229 .freeze = acpi_subsys_freeze, 1230 .poweroff = acpi_subsys_poweroff, 1231 .poweroff_late = acpi_lpss_poweroff_late, 1232 .poweroff_noirq = acpi_lpss_poweroff_noirq, 1233 .restore_noirq = acpi_lpss_restore_noirq, 1234 .restore_early = acpi_lpss_restore_early, 1235 #endif 1236 .runtime_suspend = acpi_lpss_runtime_suspend, 1237 .runtime_resume = acpi_lpss_runtime_resume, 1238 #endif 1239 }, 1240 }; 1241 1242 static int acpi_lpss_platform_notify(struct notifier_block *nb, 1243 unsigned long action, void *data) 1244 { 1245 struct platform_device *pdev = to_platform_device(data); 1246 struct lpss_private_data *pdata; 1247 struct acpi_device *adev; 1248 const struct acpi_device_id *id; 1249 1250 id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev); 1251 if (!id || !id->driver_data) 1252 return 0; 1253 1254 if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev)) 1255 return 0; 1256 1257 pdata = acpi_driver_data(adev); 1258 if (!pdata) 1259 return 0; 1260 1261 if (pdata->mmio_base && 1262 pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) { 1263 dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n"); 1264 return 0; 1265 } 1266 1267 switch (action) { 1268 case BUS_NOTIFY_BIND_DRIVER: 1269 dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain); 1270 break; 1271 case BUS_NOTIFY_DRIVER_NOT_BOUND: 1272 case BUS_NOTIFY_UNBOUND_DRIVER: 1273 dev_pm_domain_set(&pdev->dev, NULL); 1274 break; 1275 case BUS_NOTIFY_ADD_DEVICE: 1276 dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain); 1277 if (pdata->dev_desc->flags & LPSS_LTR) 1278 return sysfs_create_group(&pdev->dev.kobj, 1279 &lpss_attr_group); 1280 break; 1281 case BUS_NOTIFY_DEL_DEVICE: 1282 if (pdata->dev_desc->flags & LPSS_LTR) 1283 sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group); 1284 dev_pm_domain_set(&pdev->dev, NULL); 1285 break; 1286 default: 1287 break; 1288 } 1289 1290 return 0; 1291 } 1292 1293 static struct notifier_block acpi_lpss_nb = { 1294 .notifier_call = acpi_lpss_platform_notify, 1295 }; 1296 1297 static void acpi_lpss_bind(struct device *dev) 1298 { 1299 struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev)); 1300 1301 if (!pdata || !pdata->mmio_base || !(pdata->dev_desc->flags & LPSS_LTR)) 1302 return; 1303 1304 if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) 1305 dev->power.set_latency_tolerance = acpi_lpss_set_ltr; 1306 else 1307 dev_err(dev, "MMIO size insufficient to access LTR\n"); 1308 } 1309 1310 static void acpi_lpss_unbind(struct device *dev) 1311 { 1312 dev->power.set_latency_tolerance = NULL; 1313 } 1314 1315 static struct acpi_scan_handler lpss_handler = { 1316 .ids = acpi_lpss_device_ids, 1317 .attach = acpi_lpss_create_device, 1318 .bind = acpi_lpss_bind, 1319 .unbind = acpi_lpss_unbind, 1320 }; 1321 1322 void __init acpi_lpss_init(void) 1323 { 1324 const struct x86_cpu_id *id; 1325 int ret; 1326 1327 ret = lpt_clk_init(); 1328 if (ret) 1329 return; 1330 1331 id = x86_match_cpu(lpss_cpu_ids); 1332 if (id) 1333 lpss_quirks |= LPSS_QUIRK_ALWAYS_POWER_ON; 1334 1335 bus_register_notifier(&platform_bus_type, &acpi_lpss_nb); 1336 acpi_scan_add_handler(&lpss_handler); 1337 } 1338 1339 #else 1340 1341 static struct acpi_scan_handler lpss_handler = { 1342 .ids = acpi_lpss_device_ids, 1343 }; 1344 1345 void __init acpi_lpss_init(void) 1346 { 1347 acpi_scan_add_handler(&lpss_handler); 1348 } 1349 1350 #endif /* CONFIG_X86_INTEL_LPSS */ 1351