drivers/acpi/acpi_lpss.c

   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/pxa2xx_ssp.h>
  25 #include <linux/suspend.h>
  26 #include <linux/delay.h>
  27
  28 #include "internal.h"
  29
  30 #ifdef CONFIG_X86_INTEL_LPSS
  31
  32 #include <asm/cpu_device_id.h>
  33 #include <asm/intel-family.h>
  34 #include <asm/iosf_mbi.h>
  35
  36 #define LPSS_ADDR(desc) ((unsigned long)&desc)
  37
  38 #define LPSS_CLK_SIZE   0x04
  39 #define LPSS_LTR_SIZE   0x18
  40
  41 /* Offsets relative to LPSS_PRIVATE_OFFSET */
  42 #define LPSS_CLK_DIVIDER_DEF_MASK       (BIT(1) | BIT(16))
  43 #define LPSS_RESETS                     0x04
  44 #define LPSS_RESETS_RESET_FUNC          BIT(0)
  45 #define LPSS_RESETS_RESET_APB           BIT(1)
  46 #define LPSS_GENERAL                    0x08
  47 #define LPSS_GENERAL_LTR_MODE_SW        BIT(2)
  48 #define LPSS_GENERAL_UART_RTS_OVRD      BIT(3)
  49 #define LPSS_SW_LTR                     0x10
  50 #define LPSS_AUTO_LTR                   0x14
  51 #define LPSS_LTR_SNOOP_REQ              BIT(15)
  52 #define LPSS_LTR_SNOOP_MASK             0x0000FFFF
  53 #define LPSS_LTR_SNOOP_LAT_1US          0x800
  54 #define LPSS_LTR_SNOOP_LAT_32US         0xC00
  55 #define LPSS_LTR_SNOOP_LAT_SHIFT        5
  56 #define LPSS_LTR_SNOOP_LAT_CUTOFF       3000
  57 #define LPSS_LTR_MAX_VAL                0x3FF
  58 #define LPSS_TX_INT                     0x20
  59 #define LPSS_TX_INT_MASK                BIT(1)
  60
  61 #define LPSS_PRV_REG_COUNT              9
  62
  63 /* LPSS Flags */
  64 #define LPSS_CLK                        BIT(0)
  65 #define LPSS_CLK_GATE                   BIT(1)
  66 #define LPSS_CLK_DIVIDER                BIT(2)
  67 #define LPSS_LTR                        BIT(3)
  68 #define LPSS_SAVE_CTX                   BIT(4)
  69 /*
  70  * For some devices the DSDT AML code for another device turns off the device
  71  * before our suspend handler runs, causing us to read/save all 1-s (0xffffffff)
  72  * as ctx register values.
  73  * Luckily these devices always use the same ctx register values, so we can
  74  * work around this by saving the ctx registers once on activation.
  75  */
  76 #define LPSS_SAVE_CTX_ONCE              BIT(5)
  77 #define LPSS_NO_D3_DELAY                BIT(6)
  78
  79 struct lpss_private_data;
  80
  81 struct lpss_device_desc {
  82         unsigned int flags;
  83         const char *clk_con_id;
  84         unsigned int prv_offset;
  85         size_t prv_size_override;
  86         const struct property_entry *properties;
  87         void (*setup)(struct lpss_private_data *pdata);
  88         bool resume_from_noirq;
  89 };
  90
  91 static const struct lpss_device_desc lpss_dma_desc = {
  92         .flags = LPSS_CLK,
  93 };
  94
  95 struct lpss_private_data {
  96         struct acpi_device *adev;
  97         void __iomem *mmio_base;
  98         resource_size_t mmio_size;
  99         unsigned int fixed_clk_rate;
 100         struct clk *clk;
 101         const struct lpss_device_desc *dev_desc;
 102         u32 prv_reg_ctx[LPSS_PRV_REG_COUNT];
 103 };
 104
 105 /* Devices which need to be in D3 before lpss_iosf_enter_d3_state() proceeds */
 106 static u32 pmc_atom_d3_mask = 0xfe000ffe;
 107
 108 /* LPSS run time quirks */
 109 static unsigned int lpss_quirks;
 110
 111 /*
 112  * LPSS_QUIRK_ALWAYS_POWER_ON: override power state for LPSS DMA device.
 113  *
 114  * The LPSS DMA controller has neither _PS0 nor _PS3 method. Moreover
 115  * it can be powered off automatically whenever the last LPSS device goes down.
 116  * In case of no power any access to the DMA controller will hang the system.
 117  * The behaviour is reproduced on some HP laptops based on Intel BayTrail as
 118  * well as on ASuS T100TA transformer.
 119  *
 120  * This quirk overrides power state of entire LPSS island to keep DMA powered
 121  * on whenever we have at least one other device in use.
 122  */
 123 #define LPSS_QUIRK_ALWAYS_POWER_ON      BIT(0)
 124
 125 /* UART Component Parameter Register */
 126 #define LPSS_UART_CPR                   0xF4
 127 #define LPSS_UART_CPR_AFCE              BIT(4)
 128
 129 static void lpss_uart_setup(struct lpss_private_data *pdata)
 130 {
 131         unsigned int offset;
 132         u32 val;
 133
 134         offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;
 135         val = readl(pdata->mmio_base + offset);
 136         writel(val | LPSS_TX_INT_MASK, pdata->mmio_base + offset);
 137
 138         val = readl(pdata->mmio_base + LPSS_UART_CPR);
 139         if (!(val & LPSS_UART_CPR_AFCE)) {
 140                 offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;
 141                 val = readl(pdata->mmio_base + offset);
 142                 val |= LPSS_GENERAL_UART_RTS_OVRD;
 143                 writel(val, pdata->mmio_base + offset);
 144         }
 145 }
 146
 147 static void lpss_deassert_reset(struct lpss_private_data *pdata)
 148 {
 149         unsigned int offset;
 150         u32 val;
 151
 152         offset = pdata->dev_desc->prv_offset + LPSS_RESETS;
 153         val = readl(pdata->mmio_base + offset);
 154         val |= LPSS_RESETS_RESET_APB | LPSS_RESETS_RESET_FUNC;
 155         writel(val, pdata->mmio_base + offset);
 156 }
 157
 158 /*
 159  * BYT PWM used for backlight control by the i915 driver on systems without
 160  * the Crystal Cove PMIC.
 161  */
 162 static struct pwm_lookup byt_pwm_lookup[] = {
 163         PWM_LOOKUP_WITH_MODULE("80860F09:00", 0, "0000:00:02.0",
 164                                "pwm_soc_backlight", 0, PWM_POLARITY_NORMAL,
 165                                "pwm-lpss-platform"),
 166 };
 167
 168 static void byt_pwm_setup(struct lpss_private_data *pdata)
 169 {
 170         u64 uid;
 171
 172         /* Only call pwm_add_table for the first PWM controller */
 173         if (acpi_dev_uid_to_integer(pdata->adev, &uid) || uid != 1)
 174                 return;
 175
 176         pwm_add_table(byt_pwm_lookup, ARRAY_SIZE(byt_pwm_lookup));
 177 }
 178
 179 #define LPSS_I2C_ENABLE                 0x6c
 180
 181 static void byt_i2c_setup(struct lpss_private_data *pdata)
 182 {
 183         acpi_handle handle = pdata->adev->handle;
 184         unsigned long long shared_host = 0;
 185         acpi_status status;
 186         u64 uid;
 187
 188         /* Expected to always be successfull, but better safe then sorry */
 189         if (!acpi_dev_uid_to_integer(pdata->adev, &uid) && uid) {
 190                 /* Detect I2C bus shared with PUNIT and ignore its d3 status */
 191                 status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host);
 192                 if (ACPI_SUCCESS(status) && shared_host)
 193                         pmc_atom_d3_mask &= ~(BIT_LPSS2_F1_I2C1 << (uid - 1));
 194         }
 195
 196         lpss_deassert_reset(pdata);
 197
 198         if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset))
 199                 pdata->fixed_clk_rate = 133000000;
 200
 201         writel(0, pdata->mmio_base + LPSS_I2C_ENABLE);
 202 }
 203
 204 /*
 205  * BSW PWM1 is used for backlight control by the i915 driver
 206  * BSW PWM2 is used for backlight control for fixed (etched into the glass)
 207  * touch controls on some models. These touch-controls have specialized
 208  * drivers which know they need the "pwm_soc_lpss_2" con-id.
 209  */
 210 static struct pwm_lookup bsw_pwm_lookup[] = {
 211         PWM_LOOKUP_WITH_MODULE("80862288:00", 0, "0000:00:02.0",
 212                                "pwm_soc_backlight", 0, PWM_POLARITY_NORMAL,
 213                                "pwm-lpss-platform"),
 214         PWM_LOOKUP_WITH_MODULE("80862289:00", 0, NULL,
 215                                "pwm_soc_lpss_2", 0, PWM_POLARITY_NORMAL,
 216                                "pwm-lpss-platform"),
 217 };
 218
 219 static void bsw_pwm_setup(struct lpss_private_data *pdata)
 220 {
 221         u64 uid;
 222
 223         /* Only call pwm_add_table for the first PWM controller */
 224         if (acpi_dev_uid_to_integer(pdata->adev, &uid) || uid != 1)
 225                 return;
 226
 227         pwm_add_table(bsw_pwm_lookup, ARRAY_SIZE(bsw_pwm_lookup));
 228 }
 229
 230 static const struct property_entry lpt_spi_properties[] = {
 231         PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_LPT_SSP),
 232         { }
 233 };
 234
 235 static const struct lpss_device_desc lpt_spi_dev_desc = {
 236         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR
 237                         | LPSS_SAVE_CTX,
 238         .prv_offset = 0x800,
 239         .properties = lpt_spi_properties,
 240 };
 241
 242 static const struct lpss_device_desc lpt_i2c_dev_desc = {
 243         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_LTR | LPSS_SAVE_CTX,
 244         .prv_offset = 0x800,
 245 };
 246
 247 static struct property_entry uart_properties[] = {
 248         PROPERTY_ENTRY_U32("reg-io-width", 4),
 249         PROPERTY_ENTRY_U32("reg-shift", 2),
 250         PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
 251         { },
 252 };
 253
 254 static const struct lpss_device_desc lpt_uart_dev_desc = {
 255         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR
 256                         | LPSS_SAVE_CTX,
 257         .clk_con_id = "baudclk",
 258         .prv_offset = 0x800,
 259         .setup = lpss_uart_setup,
 260         .properties = uart_properties,
 261 };
 262
 263 static const struct lpss_device_desc lpt_sdio_dev_desc = {
 264         .flags = LPSS_LTR,
 265         .prv_offset = 0x1000,
 266         .prv_size_override = 0x1018,
 267 };
 268
 269 static const struct lpss_device_desc byt_pwm_dev_desc = {
 270         .flags = LPSS_SAVE_CTX,
 271         .prv_offset = 0x800,
 272         .setup = byt_pwm_setup,
 273 };
 274
 275 static const struct lpss_device_desc bsw_pwm_dev_desc = {
 276         .flags = LPSS_SAVE_CTX_ONCE | LPSS_NO_D3_DELAY,
 277         .prv_offset = 0x800,
 278         .setup = bsw_pwm_setup,
 279         .resume_from_noirq = true,
 280 };
 281
 282 static const struct lpss_device_desc bsw_pwm2_dev_desc = {
 283         .flags = LPSS_SAVE_CTX_ONCE | LPSS_NO_D3_DELAY,
 284         .prv_offset = 0x800,
 285         .resume_from_noirq = true,
 286 };
 287
 288 static const struct lpss_device_desc byt_uart_dev_desc = {
 289         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
 290         .clk_con_id = "baudclk",
 291         .prv_offset = 0x800,
 292         .setup = lpss_uart_setup,
 293         .properties = uart_properties,
 294 };
 295
 296 static const struct lpss_device_desc bsw_uart_dev_desc = {
 297         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX
 298                         | LPSS_NO_D3_DELAY,
 299         .clk_con_id = "baudclk",
 300         .prv_offset = 0x800,
 301         .setup = lpss_uart_setup,
 302         .properties = uart_properties,
 303 };
 304
 305 static const struct property_entry byt_spi_properties[] = {
 306         PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_BYT_SSP),
 307         { }
 308 };
 309
 310 static const struct lpss_device_desc byt_spi_dev_desc = {
 311         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
 312         .prv_offset = 0x400,
 313         .properties = byt_spi_properties,
 314 };
 315
 316 static const struct lpss_device_desc byt_sdio_dev_desc = {
 317         .flags = LPSS_CLK,
 318 };
 319
 320 static const struct lpss_device_desc byt_i2c_dev_desc = {
 321         .flags = LPSS_CLK | LPSS_SAVE_CTX,
 322         .prv_offset = 0x800,
 323         .setup = byt_i2c_setup,
 324         .resume_from_noirq = true,
 325 };
 326
 327 static const struct lpss_device_desc bsw_i2c_dev_desc = {
 328         .flags = LPSS_CLK | LPSS_SAVE_CTX | LPSS_NO_D3_DELAY,
 329         .prv_offset = 0x800,
 330         .setup = byt_i2c_setup,
 331         .resume_from_noirq = true,
 332 };
 333
 334 static const struct property_entry bsw_spi_properties[] = {
 335         PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_BSW_SSP),
 336         { }
 337 };
 338
 339 static const struct lpss_device_desc bsw_spi_dev_desc = {
 340         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX
 341                         | LPSS_NO_D3_DELAY,
 342         .prv_offset = 0x400,
 343         .setup = lpss_deassert_reset,
 344         .properties = bsw_spi_properties,
 345 };
 346
 347 static const struct x86_cpu_id lpss_cpu_ids[] = {
 348         X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT,     NULL),
 349         X86_MATCH_INTEL_FAM6_MODEL(ATOM_AIRMONT,        NULL),
 350         {}
 351 };
 352
 353 #else
 354
 355 #define LPSS_ADDR(desc) (0UL)
 356
 357 #endif /* CONFIG_X86_INTEL_LPSS */
 358
 359 static const struct acpi_device_id acpi_lpss_device_ids[] = {
 360         /* Generic LPSS devices */
 361         { "INTL9C60", LPSS_ADDR(lpss_dma_desc) },
 362
 363         /* Lynxpoint LPSS devices */
 364         { "INT33C0", LPSS_ADDR(lpt_spi_dev_desc) },
 365         { "INT33C1", LPSS_ADDR(lpt_spi_dev_desc) },
 366         { "INT33C2", LPSS_ADDR(lpt_i2c_dev_desc) },
 367         { "INT33C3", LPSS_ADDR(lpt_i2c_dev_desc) },
 368         { "INT33C4", LPSS_ADDR(lpt_uart_dev_desc) },
 369         { "INT33C5", LPSS_ADDR(lpt_uart_dev_desc) },
 370         { "INT33C6", LPSS_ADDR(lpt_sdio_dev_desc) },
 371
 372         /* BayTrail LPSS devices */
 373         { "80860F09", LPSS_ADDR(byt_pwm_dev_desc) },
 374         { "80860F0A", LPSS_ADDR(byt_uart_dev_desc) },
 375         { "80860F0E", LPSS_ADDR(byt_spi_dev_desc) },
 376         { "80860F14", LPSS_ADDR(byt_sdio_dev_desc) },
 377         { "80860F41", LPSS_ADDR(byt_i2c_dev_desc) },
 378
 379         /* Braswell LPSS devices */
 380         { "80862286", LPSS_ADDR(lpss_dma_desc) },
 381         { "80862288", LPSS_ADDR(bsw_pwm_dev_desc) },
 382         { "80862289", LPSS_ADDR(bsw_pwm2_dev_desc) },
 383         { "8086228A", LPSS_ADDR(bsw_uart_dev_desc) },
 384         { "8086228E", LPSS_ADDR(bsw_spi_dev_desc) },
 385         { "808622C0", LPSS_ADDR(lpss_dma_desc) },
 386         { "808622C1", LPSS_ADDR(bsw_i2c_dev_desc) },
 387
 388         /* Broadwell LPSS devices */
 389         { "INT3430", LPSS_ADDR(lpt_spi_dev_desc) },
 390         { "INT3431", LPSS_ADDR(lpt_spi_dev_desc) },
 391         { "INT3432", LPSS_ADDR(lpt_i2c_dev_desc) },
 392         { "INT3433", LPSS_ADDR(lpt_i2c_dev_desc) },
 393         { "INT3434", LPSS_ADDR(lpt_uart_dev_desc) },
 394         { "INT3435", LPSS_ADDR(lpt_uart_dev_desc) },
 395         { "INT3436", LPSS_ADDR(lpt_sdio_dev_desc) },
 396
 397         /* Wildcat Point LPSS devices */
 398         { "INT3438", LPSS_ADDR(lpt_spi_dev_desc) },
 399
 400         { }
 401 };
 402
 403 #ifdef CONFIG_X86_INTEL_LPSS
 404
 405 /* LPSS main clock device. */
 406 static struct platform_device *lpss_clk_dev;
 407
 408 static inline void lpt_register_clock_device(void)
 409 {
 410         lpss_clk_dev = platform_device_register_simple("clk-lpss-atom",
 411                                                        PLATFORM_DEVID_NONE,
 412                                                        NULL, 0);
 413 }
 414
 415 static int register_device_clock(struct acpi_device *adev,
 416                                  struct lpss_private_data *pdata)
 417 {
 418         const struct lpss_device_desc *dev_desc = pdata->dev_desc;
 419         const char *devname = dev_name(&adev->dev);
 420         struct clk *clk;
 421         struct lpss_clk_data *clk_data;
 422         const char *parent, *clk_name;
 423         void __iomem *prv_base;
 424
 425         if (!lpss_clk_dev)
 426                 lpt_register_clock_device();
 427
 428         if (IS_ERR(lpss_clk_dev))
 429                 return PTR_ERR(lpss_clk_dev);
 430
 431         clk_data = platform_get_drvdata(lpss_clk_dev);
 432         if (!clk_data)
 433                 return -ENODEV;
 434         clk = clk_data->clk;
 435
 436         if (!pdata->mmio_base
 437             || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
 438                 return -ENODATA;
 439
 440         parent = clk_data->name;
 441         prv_base = pdata->mmio_base + dev_desc->prv_offset;
 442
 443         if (pdata->fixed_clk_rate) {
 444                 clk = clk_register_fixed_rate(NULL, devname, parent, 0,
 445                                               pdata->fixed_clk_rate);
 446                 goto out;
 447         }
 448
 449         if (dev_desc->flags & LPSS_CLK_GATE) {
 450                 clk = clk_register_gate(NULL, devname, parent, 0,
 451                                         prv_base, 0, 0, NULL);
 452                 parent = devname;
 453         }
 454
 455         if (dev_desc->flags & LPSS_CLK_DIVIDER) {
 456                 /* Prevent division by zero */
 457                 if (!readl(prv_base))
 458                         writel(LPSS_CLK_DIVIDER_DEF_MASK, prv_base);
 459
 460                 clk_name = kasprintf(GFP_KERNEL, "%s-div", devname);
 461                 if (!clk_name)
 462                         return -ENOMEM;
 463                 clk = clk_register_fractional_divider(NULL, clk_name, parent,
 464                                                       0, prv_base, 1, 15, 16, 15,
 465                                                       CLK_FRAC_DIVIDER_POWER_OF_TWO_PS,
 466                                                       NULL);
 467                 parent = clk_name;
 468
 469                 clk_name = kasprintf(GFP_KERNEL, "%s-update", devname);
 470                 if (!clk_name) {
 471                         kfree(parent);
 472                         return -ENOMEM;
 473                 }
 474                 clk = clk_register_gate(NULL, clk_name, parent,
 475                                         CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
 476                                         prv_base, 31, 0, NULL);
 477                 kfree(parent);
 478                 kfree(clk_name);
 479         }
 480 out:
 481         if (IS_ERR(clk))
 482                 return PTR_ERR(clk);
 483
 484         pdata->clk = clk;
 485         clk_register_clkdev(clk, dev_desc->clk_con_id, devname);
 486         return 0;
 487 }
 488
 489 struct lpss_device_links {
 490         const char *supplier_hid;
 491         const char *supplier_uid;
 492         const char *consumer_hid;
 493         const char *consumer_uid;
 494         u32 flags;
 495         const struct dmi_system_id *dep_missing_ids;
 496 };
 497
 498 /* Please keep this list sorted alphabetically by vendor and model */
 499 static const struct dmi_system_id i2c1_dep_missing_dmi_ids[] = {
 500         {
 501                 .matches = {
 502                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 503                         DMI_MATCH(DMI_PRODUCT_NAME, "T200TA"),
 504                 },
 505         },
 506         {}
 507 };
 508
 509 /*
 510  * The _DEP method is used to identify dependencies but instead of creating
 511  * device links for every handle in _DEP, only links in the following list are
 512  * created. That is necessary because, in the general case, _DEP can refer to
 513  * devices that might not have drivers, or that are on different buses, or where
 514  * the supplier is not enumerated until after the consumer is probed.
 515  */
 516 static const struct lpss_device_links lpss_device_links[] = {
 517         /* CHT External sdcard slot controller depends on PMIC I2C ctrl */
 518         {"808622C1", "7", "80860F14", "3", DL_FLAG_PM_RUNTIME},
 519         /* CHT iGPU depends on PMIC I2C controller */
 520         {"808622C1", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
 521         /* BYT iGPU depends on the Embedded Controller I2C controller (UID 1) */
 522         {"80860F41", "1", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME,
 523          i2c1_dep_missing_dmi_ids},
 524         /* BYT CR iGPU depends on PMIC I2C controller (UID 5 on CR) */
 525         {"80860F41", "5", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
 526         /* BYT iGPU depends on PMIC I2C controller (UID 7 on non CR) */
 527         {"80860F41", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
 528 };
 529
 530 static bool acpi_lpss_is_supplier(struct acpi_device *adev,
 531                                   const struct lpss_device_links *link)
 532 {
 533         return acpi_dev_hid_uid_match(adev, link->supplier_hid, link->supplier_uid);
 534 }
 535
 536 static bool acpi_lpss_is_consumer(struct acpi_device *adev,
 537                                   const struct lpss_device_links *link)
 538 {
 539         return acpi_dev_hid_uid_match(adev, link->consumer_hid, link->consumer_uid);
 540 }
 541
 542 struct hid_uid {
 543         const char *hid;
 544         const char *uid;
 545 };
 546
 547 static int match_hid_uid(struct device *dev, const void *data)
 548 {
 549         struct acpi_device *adev = ACPI_COMPANION(dev);
 550         const struct hid_uid *id = data;
 551
 552         if (!adev)
 553                 return 0;
 554
 555         return acpi_dev_hid_uid_match(adev, id->hid, id->uid);
 556 }
 557
 558 static struct device *acpi_lpss_find_device(const char *hid, const char *uid)
 559 {
 560         struct device *dev;
 561
 562         struct hid_uid data = {
 563                 .hid = hid,
 564                 .uid = uid,
 565         };
 566
 567         dev = bus_find_device(&platform_bus_type, NULL, &data, match_hid_uid);
 568         if (dev)
 569                 return dev;
 570
 571         return bus_find_device(&pci_bus_type, NULL, &data, match_hid_uid);
 572 }
 573
 574 static bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle)
 575 {
 576         struct acpi_handle_list dep_devices;
 577         acpi_status status;
 578         bool ret = false;
 579         int i;
 580
 581         if (!acpi_has_method(adev->handle, "_DEP"))
 582                 return false;
 583
 584         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
 585                                          &dep_devices);
 586         if (ACPI_FAILURE(status)) {
 587                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
 588                 return false;
 589         }
 590
 591         for (i = 0; i < dep_devices.count; i++) {
 592                 if (dep_devices.handles[i] == handle) {
 593                         ret = true;
 594                         break;
 595                 }
 596         }
 597
 598         acpi_handle_list_free(&dep_devices);
 599         return ret;
 600 }
 601
 602 static void acpi_lpss_link_consumer(struct device *dev1,
 603                                     const struct lpss_device_links *link)
 604 {
 605         struct device *dev2;
 606
 607         dev2 = acpi_lpss_find_device(link->consumer_hid, link->consumer_uid);
 608         if (!dev2)
 609                 return;
 610
 611         if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))
 612             || acpi_lpss_dep(ACPI_COMPANION(dev2), ACPI_HANDLE(dev1)))
 613                 device_link_add(dev2, dev1, link->flags);
 614
 615         put_device(dev2);
 616 }
 617
 618 static void acpi_lpss_link_supplier(struct device *dev1,
 619                                     const struct lpss_device_links *link)
 620 {
 621         struct device *dev2;
 622
 623         dev2 = acpi_lpss_find_device(link->supplier_hid, link->supplier_uid);
 624         if (!dev2)
 625                 return;
 626
 627         if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))
 628             || acpi_lpss_dep(ACPI_COMPANION(dev1), ACPI_HANDLE(dev2)))
 629                 device_link_add(dev1, dev2, link->flags);
 630
 631         put_device(dev2);
 632 }
 633
 634 static void acpi_lpss_create_device_links(struct acpi_device *adev,
 635                                           struct platform_device *pdev)
 636 {
 637         int i;
 638
 639         for (i = 0; i < ARRAY_SIZE(lpss_device_links); i++) {
 640                 const struct lpss_device_links *link = &lpss_device_links[i];
 641
 642                 if (acpi_lpss_is_supplier(adev, link))
 643                         acpi_lpss_link_consumer(&pdev->dev, link);
 644
 645                 if (acpi_lpss_is_consumer(adev, link))
 646                         acpi_lpss_link_supplier(&pdev->dev, link);
 647         }
 648 }
 649
 650 static int acpi_lpss_create_device(struct acpi_device *adev,
 651                                    const struct acpi_device_id *id)
 652 {
 653         const struct lpss_device_desc *dev_desc;
 654         struct lpss_private_data *pdata;
 655         struct resource_entry *rentry;
 656         struct list_head resource_list;
 657         struct platform_device *pdev;
 658         int ret;
 659
 660         dev_desc = (const struct lpss_device_desc *)id->driver_data;
 661         if (!dev_desc)
 662                 return -EINVAL;
 663
 664         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 665         if (!pdata)
 666                 return -ENOMEM;
 667
 668         INIT_LIST_HEAD(&resource_list);
 669         ret = acpi_dev_get_memory_resources(adev, &resource_list);
 670         if (ret < 0)
 671                 goto err_out;
 672
 673         rentry = list_first_entry_or_null(&resource_list, struct resource_entry, node);
 674         if (rentry) {
 675                 if (dev_desc->prv_size_override)
 676                         pdata->mmio_size = dev_desc->prv_size_override;
 677                 else
 678                         pdata->mmio_size = resource_size(rentry->res);
 679                 pdata->mmio_base = ioremap(rentry->res->start, pdata->mmio_size);
 680         }
 681
 682         acpi_dev_free_resource_list(&resource_list);
 683
 684         if (!pdata->mmio_base) {
 685                 /* Avoid acpi_bus_attach() instantiating a pdev for this dev. */
 686                 adev->pnp.type.platform_id = 0;
 687                 goto out_free;
 688         }
 689
 690         pdata->adev = adev;
 691         pdata->dev_desc = dev_desc;
 692
 693         if (dev_desc->setup)
 694                 dev_desc->setup(pdata);
 695
 696         if (dev_desc->flags & LPSS_CLK) {
 697                 ret = register_device_clock(adev, pdata);
 698                 if (ret)
 699                         goto out_free;
 700         }
 701
 702         /*
 703          * This works around a known issue in ACPI tables where LPSS devices
 704          * have _PS0 and _PS3 without _PSC (and no power resources), so
 705          * acpi_bus_init_power() will assume that the BIOS has put them into D0.
 706          */
 707         acpi_device_fix_up_power(adev);
 708
 709         adev->driver_data = pdata;
 710         pdev = acpi_create_platform_device(adev, dev_desc->properties);
 711         if (IS_ERR_OR_NULL(pdev)) {
 712                 adev->driver_data = NULL;
 713                 ret = PTR_ERR(pdev);
 714                 goto err_out;
 715         }
 716
 717         acpi_lpss_create_device_links(adev, pdev);
 718         return 1;
 719
 720 out_free:
 721         /* Skip the device, but continue the namespace scan */
 722         ret = 0;
 723 err_out:
 724         kfree(pdata);
 725         return ret;
 726 }
 727
 728 static u32 __lpss_reg_read(struct lpss_private_data *pdata, unsigned int reg)
 729 {
 730         return readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
 731 }
 732
 733 static void __lpss_reg_write(u32 val, struct lpss_private_data *pdata,
 734                              unsigned int reg)
 735 {
 736         writel(val, pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
 737 }
 738
 739 static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
 740 {
 741         struct acpi_device *adev = ACPI_COMPANION(dev);
 742         struct lpss_private_data *pdata;
 743         unsigned long flags;
 744         int ret;
 745
 746         if (WARN_ON(!adev))
 747                 return -ENODEV;
 748
 749         spin_lock_irqsave(&dev->power.lock, flags);
 750         if (pm_runtime_suspended(dev)) {
 751                 ret = -EAGAIN;
 752                 goto out;
 753         }
 754         pdata = acpi_driver_data(adev);
 755         if (WARN_ON(!pdata || !pdata->mmio_base)) {
 756                 ret = -ENODEV;
 757                 goto out;
 758         }
 759         *val = __lpss_reg_read(pdata, reg);
 760         ret = 0;
 761
 762  out:
 763         spin_unlock_irqrestore(&dev->power.lock, flags);
 764         return ret;
 765 }
 766
 767 static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr,
 768                              char *buf)
 769 {
 770         u32 ltr_value = 0;
 771         unsigned int reg;
 772         int ret;
 773
 774         reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;
 775         ret = lpss_reg_read(dev, reg, &ltr_value);
 776         if (ret)
 777                 return ret;
 778
 779         return sysfs_emit(buf, "%08x\n", ltr_value);
 780 }
 781
 782 static ssize_t lpss_ltr_mode_show(struct device *dev,
 783                                   struct device_attribute *attr, char *buf)
 784 {
 785         u32 ltr_mode = 0;
 786         char *outstr;
 787         int ret;
 788
 789         ret = lpss_reg_read(dev, LPSS_GENERAL, &ltr_mode);
 790         if (ret)
 791                 return ret;
 792
 793         outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto";
 794         return sprintf(buf, "%s\n", outstr);
 795 }
 796
 797 static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL);
 798 static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL);
 799 static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL);
 800
 801 static struct attribute *lpss_attrs[] = {
 802         &dev_attr_auto_ltr.attr,
 803         &dev_attr_sw_ltr.attr,
 804         &dev_attr_ltr_mode.attr,
 805         NULL,
 806 };
 807
 808 static const struct attribute_group lpss_attr_group = {
 809         .attrs = lpss_attrs,
 810         .name = "lpss_ltr",
 811 };
 812
 813 static void acpi_lpss_set_ltr(struct device *dev, s32 val)
 814 {
 815         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
 816         u32 ltr_mode, ltr_val;
 817
 818         ltr_mode = __lpss_reg_read(pdata, LPSS_GENERAL);
 819         if (val < 0) {
 820                 if (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) {
 821                         ltr_mode &= ~LPSS_GENERAL_LTR_MODE_SW;
 822                         __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
 823                 }
 824                 return;
 825         }
 826         ltr_val = __lpss_reg_read(pdata, LPSS_SW_LTR) & ~LPSS_LTR_SNOOP_MASK;
 827         if (val >= LPSS_LTR_SNOOP_LAT_CUTOFF) {
 828                 ltr_val |= LPSS_LTR_SNOOP_LAT_32US;
 829                 val = LPSS_LTR_MAX_VAL;
 830         } else if (val > LPSS_LTR_MAX_VAL) {
 831                 ltr_val |= LPSS_LTR_SNOOP_LAT_32US | LPSS_LTR_SNOOP_REQ;
 832                 val >>= LPSS_LTR_SNOOP_LAT_SHIFT;
 833         } else {
 834                 ltr_val |= LPSS_LTR_SNOOP_LAT_1US | LPSS_LTR_SNOOP_REQ;
 835         }
 836         ltr_val |= val;
 837         __lpss_reg_write(ltr_val, pdata, LPSS_SW_LTR);
 838         if (!(ltr_mode & LPSS_GENERAL_LTR_MODE_SW)) {
 839                 ltr_mode |= LPSS_GENERAL_LTR_MODE_SW;
 840                 __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
 841         }
 842 }
 843
 844 #ifdef CONFIG_PM
 845 /**
 846  * acpi_lpss_save_ctx() - Save the private registers of LPSS device
 847  * @dev: LPSS device
 848  * @pdata: pointer to the private data of the LPSS device
 849  *
 850  * Most LPSS devices have private registers which may loose their context when
 851  * the device is powered down. acpi_lpss_save_ctx() saves those registers into
 852  * prv_reg_ctx array.
 853  */
 854 static void acpi_lpss_save_ctx(struct device *dev,
 855                                struct lpss_private_data *pdata)
 856 {
 857         unsigned int i;
 858
 859         for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
 860                 unsigned long offset = i * sizeof(u32);
 861
 862                 pdata->prv_reg_ctx[i] = __lpss_reg_read(pdata, offset);
 863                 dev_dbg(dev, "saving 0x%08x from LPSS reg at offset 0x%02lx\n",
 864                         pdata->prv_reg_ctx[i], offset);
 865         }
 866 }
 867
 868 /**
 869  * acpi_lpss_restore_ctx() - Restore the private registers of LPSS device
 870  * @dev: LPSS device
 871  * @pdata: pointer to the private data of the LPSS device
 872  *
 873  * Restores the registers that were previously stored with acpi_lpss_save_ctx().
 874  */
 875 static void acpi_lpss_restore_ctx(struct device *dev,
 876                                   struct lpss_private_data *pdata)
 877 {
 878         unsigned int i;
 879
 880         for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
 881                 unsigned long offset = i * sizeof(u32);
 882
 883                 __lpss_reg_write(pdata->prv_reg_ctx[i], pdata, offset);
 884                 dev_dbg(dev, "restoring 0x%08x to LPSS reg at offset 0x%02lx\n",
 885                         pdata->prv_reg_ctx[i], offset);
 886         }
 887 }
 888
 889 static void acpi_lpss_d3_to_d0_delay(struct lpss_private_data *pdata)
 890 {
 891         /*
 892          * The following delay is needed or the subsequent write operations may
 893          * fail. The LPSS devices are actually PCI devices and the PCI spec
 894          * expects 10ms delay before the device can be accessed after D3 to D0
 895          * transition. However some platforms like BSW does not need this delay.
 896          */
 897         unsigned int delay = 10;        /* default 10ms delay */
 898
 899         if (pdata->dev_desc->flags & LPSS_NO_D3_DELAY)
 900                 delay = 0;
 901
 902         msleep(delay);
 903 }
 904
 905 static int acpi_lpss_activate(struct device *dev)
 906 {
 907         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
 908         int ret;
 909
 910         ret = acpi_dev_resume(dev);
 911         if (ret)
 912                 return ret;
 913
 914         acpi_lpss_d3_to_d0_delay(pdata);
 915
 916         /*
 917          * This is called only on ->probe() stage where a device is either in
 918          * known state defined by BIOS or most likely powered off. Due to this
 919          * we have to deassert reset line to be sure that ->probe() will
 920          * recognize the device.
 921          */
 922         if (pdata->dev_desc->flags & (LPSS_SAVE_CTX | LPSS_SAVE_CTX_ONCE))
 923                 lpss_deassert_reset(pdata);
 924
 925 #ifdef CONFIG_PM
 926         if (pdata->dev_desc->flags & LPSS_SAVE_CTX_ONCE)
 927                 acpi_lpss_save_ctx(dev, pdata);
 928 #endif
 929
 930         return 0;
 931 }
 932
 933 static void acpi_lpss_dismiss(struct device *dev)
 934 {
 935         acpi_dev_suspend(dev, false);
 936 }
 937
 938 /* IOSF SB for LPSS island */
 939 #define LPSS_IOSF_UNIT_LPIOEP           0xA0
 940 #define LPSS_IOSF_UNIT_LPIO1            0xAB
 941 #define LPSS_IOSF_UNIT_LPIO2            0xAC
 942
 943 #define LPSS_IOSF_PMCSR                 0x84
 944 #define LPSS_PMCSR_D0                   0
 945 #define LPSS_PMCSR_D3hot                3
 946 #define LPSS_PMCSR_Dx_MASK              GENMASK(1, 0)
 947
 948 #define LPSS_IOSF_GPIODEF0              0x154
 949 #define LPSS_GPIODEF0_DMA1_D3           BIT(2)
 950 #define LPSS_GPIODEF0_DMA2_D3           BIT(3)
 951 #define LPSS_GPIODEF0_DMA_D3_MASK       GENMASK(3, 2)
 952 #define LPSS_GPIODEF0_DMA_LLP           BIT(13)
 953
 954 static DEFINE_MUTEX(lpss_iosf_mutex);
 955 static bool lpss_iosf_d3_entered = true;
 956
 957 static void lpss_iosf_enter_d3_state(void)
 958 {
 959         u32 value1 = 0;
 960         u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK | LPSS_GPIODEF0_DMA_LLP;
 961         u32 value2 = LPSS_PMCSR_D3hot;
 962         u32 mask2 = LPSS_PMCSR_Dx_MASK;
 963         /*
 964          * PMC provides an information about actual status of the LPSS devices.
 965          * Here we read the values related to LPSS power island, i.e. LPSS
 966          * devices, excluding both LPSS DMA controllers, along with SCC domain.
 967          */
 968         u32 func_dis, d3_sts_0, pmc_status;
 969         int ret;
 970
 971         ret = pmc_atom_read(PMC_FUNC_DIS, &func_dis);
 972         if (ret)
 973                 return;
 974
 975         mutex_lock(&lpss_iosf_mutex);
 976
 977         ret = pmc_atom_read(PMC_D3_STS_0, &d3_sts_0);
 978         if (ret)
 979                 goto exit;
 980
 981         /*
 982          * Get the status of entire LPSS power island per device basis.
 983          * Shutdown both LPSS DMA controllers if and only if all other devices
 984          * are already in D3hot.
 985          */
 986         pmc_status = (~(d3_sts_0 | func_dis)) & pmc_atom_d3_mask;
 987         if (pmc_status)
 988                 goto exit;
 989
 990         iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE,
 991                         LPSS_IOSF_PMCSR, value2, mask2);
 992
 993         iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2, MBI_CFG_WRITE,
 994                         LPSS_IOSF_PMCSR, value2, mask2);
 995
 996         iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE,
 997                         LPSS_IOSF_GPIODEF0, value1, mask1);
 998
 999         lpss_iosf_d3_entered = true;
1000
1001 exit:
1002         mutex_unlock(&lpss_iosf_mutex);
1003 }
1004
1005 static void lpss_iosf_exit_d3_state(void)
1006 {
1007         u32 value1 = LPSS_GPIODEF0_DMA1_D3 | LPSS_GPIODEF0_DMA2_D3 |
1008                      LPSS_GPIODEF0_DMA_LLP;
1009         u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK | LPSS_GPIODEF0_DMA_LLP;
1010         u32 value2 = LPSS_PMCSR_D0;
1011         u32 mask2 = LPSS_PMCSR_Dx_MASK;
1012
1013         mutex_lock(&lpss_iosf_mutex);
1014
1015         if (!lpss_iosf_d3_entered)
1016                 goto exit;
1017
1018         lpss_iosf_d3_entered = false;
1019
1020         iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE,
1021                         LPSS_IOSF_GPIODEF0, value1, mask1);
1022
1023         iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2, MBI_CFG_WRITE,
1024                         LPSS_IOSF_PMCSR, value2, mask2);
1025
1026         iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE,
1027                         LPSS_IOSF_PMCSR, value2, mask2);
1028
1029 exit:
1030         mutex_unlock(&lpss_iosf_mutex);
1031 }
1032
1033 static int acpi_lpss_suspend(struct device *dev, bool wakeup)
1034 {
1035         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1036         int ret;
1037
1038         if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
1039                 acpi_lpss_save_ctx(dev, pdata);
1040
1041         ret = acpi_dev_suspend(dev, wakeup);
1042
1043         /*
1044          * This call must be last in the sequence, otherwise PMC will return
1045          * wrong status for devices being about to be powered off. See
1046          * lpss_iosf_enter_d3_state() for further information.
1047          */
1048         if (acpi_target_system_state() == ACPI_STATE_S0 &&
1049             lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
1050                 lpss_iosf_enter_d3_state();
1051
1052         return ret;
1053 }
1054
1055 static int acpi_lpss_resume(struct device *dev)
1056 {
1057         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1058         int ret;
1059
1060         /*
1061          * This call is kept first to be in symmetry with
1062          * acpi_lpss_runtime_suspend() one.
1063          */
1064         if (lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
1065                 lpss_iosf_exit_d3_state();
1066
1067         ret = acpi_dev_resume(dev);
1068         if (ret)
1069                 return ret;
1070
1071         acpi_lpss_d3_to_d0_delay(pdata);
1072
1073         if (pdata->dev_desc->flags & (LPSS_SAVE_CTX | LPSS_SAVE_CTX_ONCE))
1074                 acpi_lpss_restore_ctx(dev, pdata);
1075
1076         return 0;
1077 }
1078
1079 #ifdef CONFIG_PM_SLEEP
1080 static int acpi_lpss_do_suspend_late(struct device *dev)
1081 {
1082         int ret;
1083
1084         if (dev_pm_skip_suspend(dev))
1085                 return 0;
1086
1087         ret = pm_generic_suspend_late(dev);
1088         return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev));
1089 }
1090
1091 static int acpi_lpss_suspend_late(struct device *dev)
1092 {
1093         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1094
1095         if (pdata->dev_desc->resume_from_noirq)
1096                 return 0;
1097
1098         return acpi_lpss_do_suspend_late(dev);
1099 }
1100
1101 static int acpi_lpss_suspend_noirq(struct device *dev)
1102 {
1103         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1104         int ret;
1105
1106         if (pdata->dev_desc->resume_from_noirq) {
1107                 /*
1108                  * The driver's ->suspend_late callback will be invoked by
1109                  * acpi_lpss_do_suspend_late(), with the assumption that the
1110                  * driver really wanted to run that code in ->suspend_noirq, but
1111                  * it could not run after acpi_dev_suspend() and the driver
1112                  * expected the latter to be called in the "late" phase.
1113                  */
1114                 ret = acpi_lpss_do_suspend_late(dev);
1115                 if (ret)
1116                         return ret;
1117         }
1118
1119         return acpi_subsys_suspend_noirq(dev);
1120 }
1121
1122 static int acpi_lpss_do_resume_early(struct device *dev)
1123 {
1124         int ret = acpi_lpss_resume(dev);
1125
1126         return ret ? ret : pm_generic_resume_early(dev);
1127 }
1128
1129 static int acpi_lpss_resume_early(struct device *dev)
1130 {
1131         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1132
1133         if (pdata->dev_desc->resume_from_noirq)
1134                 return 0;
1135
1136         if (dev_pm_skip_resume(dev))
1137                 return 0;
1138
1139         return acpi_lpss_do_resume_early(dev);
1140 }
1141
1142 static int acpi_lpss_resume_noirq(struct device *dev)
1143 {
1144         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1145         int ret;
1146
1147         /* Follow acpi_subsys_resume_noirq(). */
1148         if (dev_pm_skip_resume(dev))
1149                 return 0;
1150
1151         ret = pm_generic_resume_noirq(dev);
1152         if (ret)
1153                 return ret;
1154
1155         if (!pdata->dev_desc->resume_from_noirq)
1156                 return 0;
1157
1158         /*
1159          * The driver's ->resume_early callback will be invoked by
1160          * acpi_lpss_do_resume_early(), with the assumption that the driver
1161          * really wanted to run that code in ->resume_noirq, but it could not
1162          * run before acpi_dev_resume() and the driver expected the latter to be
1163          * called in the "early" phase.
1164          */
1165         return acpi_lpss_do_resume_early(dev);
1166 }
1167
1168 static int acpi_lpss_do_restore_early(struct device *dev)
1169 {
1170         int ret = acpi_lpss_resume(dev);
1171
1172         return ret ? ret : pm_generic_restore_early(dev);
1173 }
1174
1175 static int acpi_lpss_restore_early(struct device *dev)
1176 {
1177         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1178
1179         if (pdata->dev_desc->resume_from_noirq)
1180                 return 0;
1181
1182         return acpi_lpss_do_restore_early(dev);
1183 }
1184
1185 static int acpi_lpss_restore_noirq(struct device *dev)
1186 {
1187         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1188         int ret;
1189
1190         ret = pm_generic_restore_noirq(dev);
1191         if (ret)
1192                 return ret;
1193
1194         if (!pdata->dev_desc->resume_from_noirq)
1195                 return 0;
1196
1197         /* This is analogous to what happens in acpi_lpss_resume_noirq(). */
1198         return acpi_lpss_do_restore_early(dev);
1199 }
1200
1201 static int acpi_lpss_do_poweroff_late(struct device *dev)
1202 {
1203         int ret = pm_generic_poweroff_late(dev);
1204
1205         return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev));
1206 }
1207
1208 static int acpi_lpss_poweroff_late(struct device *dev)
1209 {
1210         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1211
1212         if (dev_pm_skip_suspend(dev))
1213                 return 0;
1214
1215         if (pdata->dev_desc->resume_from_noirq)
1216                 return 0;
1217
1218         return acpi_lpss_do_poweroff_late(dev);
1219 }
1220
1221 static int acpi_lpss_poweroff_noirq(struct device *dev)
1222 {
1223         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1224
1225         if (dev_pm_skip_suspend(dev))
1226                 return 0;
1227
1228         if (pdata->dev_desc->resume_from_noirq) {
1229                 /* This is analogous to the acpi_lpss_suspend_noirq() case. */
1230                 int ret = acpi_lpss_do_poweroff_late(dev);
1231
1232                 if (ret)
1233                         return ret;
1234         }
1235
1236         return pm_generic_poweroff_noirq(dev);
1237 }
1238 #endif /* CONFIG_PM_SLEEP */
1239
1240 static int acpi_lpss_runtime_suspend(struct device *dev)
1241 {
1242         int ret = pm_generic_runtime_suspend(dev);
1243
1244         return ret ? ret : acpi_lpss_suspend(dev, true);
1245 }
1246
1247 static int acpi_lpss_runtime_resume(struct device *dev)
1248 {
1249         int ret = acpi_lpss_resume(dev);
1250
1251         return ret ? ret : pm_generic_runtime_resume(dev);
1252 }
1253 #endif /* CONFIG_PM */
1254
1255 static struct dev_pm_domain acpi_lpss_pm_domain = {
1256 #ifdef CONFIG_PM
1257         .activate = acpi_lpss_activate,
1258         .dismiss = acpi_lpss_dismiss,
1259 #endif
1260         .ops = {
1261 #ifdef CONFIG_PM
1262 #ifdef CONFIG_PM_SLEEP
1263                 .prepare = acpi_subsys_prepare,
1264                 .complete = acpi_subsys_complete,
1265                 .suspend = acpi_subsys_suspend,
1266                 .suspend_late = acpi_lpss_suspend_late,
1267                 .suspend_noirq = acpi_lpss_suspend_noirq,
1268                 .resume_noirq = acpi_lpss_resume_noirq,
1269                 .resume_early = acpi_lpss_resume_early,
1270                 .freeze = acpi_subsys_freeze,
1271                 .poweroff = acpi_subsys_poweroff,
1272                 .poweroff_late = acpi_lpss_poweroff_late,
1273                 .poweroff_noirq = acpi_lpss_poweroff_noirq,
1274                 .restore_noirq = acpi_lpss_restore_noirq,
1275                 .restore_early = acpi_lpss_restore_early,
1276 #endif
1277                 .runtime_suspend = acpi_lpss_runtime_suspend,
1278                 .runtime_resume = acpi_lpss_runtime_resume,
1279 #endif
1280         },
1281 };
1282
1283 static int acpi_lpss_platform_notify(struct notifier_block *nb,
1284                                      unsigned long action, void *data)
1285 {
1286         struct platform_device *pdev = to_platform_device(data);
1287         struct lpss_private_data *pdata;
1288         struct acpi_device *adev;
1289         const struct acpi_device_id *id;
1290
1291         id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);
1292         if (!id || !id->driver_data)
1293                 return 0;
1294
1295         adev = ACPI_COMPANION(&pdev->dev);
1296         if (!adev)
1297                 return 0;
1298
1299         pdata = acpi_driver_data(adev);
1300         if (!pdata)
1301                 return 0;
1302
1303         if (pdata->mmio_base &&
1304             pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {
1305                 dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");
1306                 return 0;
1307         }
1308
1309         switch (action) {
1310         case BUS_NOTIFY_BIND_DRIVER:
1311                 dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);
1312                 break;
1313         case BUS_NOTIFY_DRIVER_NOT_BOUND:
1314         case BUS_NOTIFY_UNBOUND_DRIVER:
1315                 dev_pm_domain_set(&pdev->dev, NULL);
1316                 break;
1317         case BUS_NOTIFY_ADD_DEVICE:
1318                 dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);
1319                 if (pdata->dev_desc->flags & LPSS_LTR)
1320                         return sysfs_create_group(&pdev->dev.kobj,
1321                                                   &lpss_attr_group);
1322                 break;
1323         case BUS_NOTIFY_DEL_DEVICE:
1324                 if (pdata->dev_desc->flags & LPSS_LTR)
1325                         sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
1326                 dev_pm_domain_set(&pdev->dev, NULL);
1327                 break;
1328         default:
1329                 break;
1330         }
1331
1332         return 0;
1333 }
1334
1335 static struct notifier_block acpi_lpss_nb = {
1336         .notifier_call = acpi_lpss_platform_notify,
1337 };
1338
1339 static void acpi_lpss_bind(struct device *dev)
1340 {
1341         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1342
1343         if (!pdata || !pdata->mmio_base || !(pdata->dev_desc->flags & LPSS_LTR))
1344                 return;
1345
1346         if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE)
1347                 dev->power.set_latency_tolerance = acpi_lpss_set_ltr;
1348         else
1349                 dev_err(dev, "MMIO size insufficient to access LTR\n");
1350 }
1351
1352 static void acpi_lpss_unbind(struct device *dev)
1353 {
1354         dev->power.set_latency_tolerance = NULL;
1355 }
1356
1357 static struct acpi_scan_handler lpss_handler = {
1358         .ids = acpi_lpss_device_ids,
1359         .attach = acpi_lpss_create_device,
1360         .bind = acpi_lpss_bind,
1361         .unbind = acpi_lpss_unbind,
1362 };
1363
1364 void __init acpi_lpss_init(void)
1365 {
1366         const struct x86_cpu_id *id;
1367         int ret;
1368
1369         ret = lpss_atom_clk_init();
1370         if (ret)
1371                 return;
1372
1373         id = x86_match_cpu(lpss_cpu_ids);
1374         if (id)
1375                 lpss_quirks |= LPSS_QUIRK_ALWAYS_POWER_ON;
1376
1377         bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
1378         acpi_scan_add_handler(&lpss_handler);
1379 }
1380
1381 #else
1382
1383 static struct acpi_scan_handler lpss_handler = {
1384         .ids = acpi_lpss_device_ids,
1385 };
1386
1387 void __init acpi_lpss_init(void)
1388 {
1389         acpi_scan_add_handler(&lpss_handler);
1390 }
1391
1392 #endif /* CONFIG_X86_INTEL_LPSS */