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 <[email protected]>
   7  *          Rafael J. Wysocki <[email protected]>
   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         struct acpi_device *adev = pdata->adev;
 171
 172         /* Only call pwm_add_table for the first PWM controller */
 173         if (!adev->pnp.unique_id || strcmp(adev->pnp.unique_id, "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         const char *uid_str = acpi_device_uid(pdata->adev);
 184         acpi_handle handle = pdata->adev->handle;
 185         unsigned long long shared_host = 0;
 186         acpi_status status;
 187         long uid = 0;
 188
 189         /* Expected to always be true, but better safe then sorry */
 190         if (uid_str && !kstrtol(uid_str, 10, &uid) && uid) {
 191                 /* Detect I2C bus shared with PUNIT and ignore its d3 status */
 192                 status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host);
 193                 if (ACPI_SUCCESS(status) && shared_host)
 194                         pmc_atom_d3_mask &= ~(BIT_LPSS2_F1_I2C1 << (uid - 1));
 195         }
 196
 197         lpss_deassert_reset(pdata);
 198
 199         if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset))
 200                 pdata->fixed_clk_rate = 133000000;
 201
 202         writel(0, pdata->mmio_base + LPSS_I2C_ENABLE);
 203 }
 204
 205 /* BSW PWM used for backlight control by the i915 driver */
 206 static struct pwm_lookup bsw_pwm_lookup[] = {
 207         PWM_LOOKUP_WITH_MODULE("80862288:00", 0, "0000:00:02.0",
 208                                "pwm_soc_backlight", 0, PWM_POLARITY_NORMAL,
 209                                "pwm-lpss-platform"),
 210 };
 211
 212 static void bsw_pwm_setup(struct lpss_private_data *pdata)
 213 {
 214         struct acpi_device *adev = pdata->adev;
 215
 216         /* Only call pwm_add_table for the first PWM controller */
 217         if (!adev->pnp.unique_id || strcmp(adev->pnp.unique_id, "1"))
 218                 return;
 219
 220         pwm_add_table(bsw_pwm_lookup, ARRAY_SIZE(bsw_pwm_lookup));
 221 }
 222
 223 static const struct property_entry lpt_spi_properties[] = {
 224         PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_LPT_SSP),
 225         { }
 226 };
 227
 228 static const struct lpss_device_desc lpt_spi_dev_desc = {
 229         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR
 230                         | LPSS_SAVE_CTX,
 231         .prv_offset = 0x800,
 232         .properties = lpt_spi_properties,
 233 };
 234
 235 static const struct lpss_device_desc lpt_i2c_dev_desc = {
 236         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_LTR | LPSS_SAVE_CTX,
 237         .prv_offset = 0x800,
 238 };
 239
 240 static struct property_entry uart_properties[] = {
 241         PROPERTY_ENTRY_U32("reg-io-width", 4),
 242         PROPERTY_ENTRY_U32("reg-shift", 2),
 243         PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
 244         { },
 245 };
 246
 247 static const struct lpss_device_desc lpt_uart_dev_desc = {
 248         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR
 249                         | LPSS_SAVE_CTX,
 250         .clk_con_id = "baudclk",
 251         .prv_offset = 0x800,
 252         .setup = lpss_uart_setup,
 253         .properties = uart_properties,
 254 };
 255
 256 static const struct lpss_device_desc lpt_sdio_dev_desc = {
 257         .flags = LPSS_LTR,
 258         .prv_offset = 0x1000,
 259         .prv_size_override = 0x1018,
 260 };
 261
 262 static const struct lpss_device_desc byt_pwm_dev_desc = {
 263         .flags = LPSS_SAVE_CTX,
 264         .prv_offset = 0x800,
 265         .setup = byt_pwm_setup,
 266 };
 267
 268 static const struct lpss_device_desc bsw_pwm_dev_desc = {
 269         .flags = LPSS_SAVE_CTX_ONCE | LPSS_NO_D3_DELAY,
 270         .prv_offset = 0x800,
 271         .setup = bsw_pwm_setup,
 272         .resume_from_noirq = true,
 273 };
 274
 275 static const struct lpss_device_desc byt_uart_dev_desc = {
 276         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
 277         .clk_con_id = "baudclk",
 278         .prv_offset = 0x800,
 279         .setup = lpss_uart_setup,
 280         .properties = uart_properties,
 281 };
 282
 283 static const struct lpss_device_desc bsw_uart_dev_desc = {
 284         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX
 285                         | LPSS_NO_D3_DELAY,
 286         .clk_con_id = "baudclk",
 287         .prv_offset = 0x800,
 288         .setup = lpss_uart_setup,
 289         .properties = uart_properties,
 290 };
 291
 292 static const struct property_entry byt_spi_properties[] = {
 293         PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_BYT_SSP),
 294         { }
 295 };
 296
 297 static const struct lpss_device_desc byt_spi_dev_desc = {
 298         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
 299         .prv_offset = 0x400,
 300         .properties = byt_spi_properties,
 301 };
 302
 303 static const struct lpss_device_desc byt_sdio_dev_desc = {
 304         .flags = LPSS_CLK,
 305 };
 306
 307 static const struct lpss_device_desc byt_i2c_dev_desc = {
 308         .flags = LPSS_CLK | LPSS_SAVE_CTX,
 309         .prv_offset = 0x800,
 310         .setup = byt_i2c_setup,
 311         .resume_from_noirq = true,
 312 };
 313
 314 static const struct lpss_device_desc bsw_i2c_dev_desc = {
 315         .flags = LPSS_CLK | LPSS_SAVE_CTX | LPSS_NO_D3_DELAY,
 316         .prv_offset = 0x800,
 317         .setup = byt_i2c_setup,
 318         .resume_from_noirq = true,
 319 };
 320
 321 static const struct property_entry bsw_spi_properties[] = {
 322         PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_BSW_SSP),
 323         { }
 324 };
 325
 326 static const struct lpss_device_desc bsw_spi_dev_desc = {
 327         .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX
 328                         | LPSS_NO_D3_DELAY,
 329         .prv_offset = 0x400,
 330         .setup = lpss_deassert_reset,
 331         .properties = bsw_spi_properties,
 332 };
 333
 334 static const struct x86_cpu_id lpss_cpu_ids[] = {
 335         X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT,     NULL),
 336         X86_MATCH_INTEL_FAM6_MODEL(ATOM_AIRMONT,        NULL),
 337         {}
 338 };
 339
 340 #else
 341
 342 #define LPSS_ADDR(desc) (0UL)
 343
 344 #endif /* CONFIG_X86_INTEL_LPSS */
 345
 346 static const struct acpi_device_id acpi_lpss_device_ids[] = {
 347         /* Generic LPSS devices */
 348         { "INTL9C60", LPSS_ADDR(lpss_dma_desc) },
 349
 350         /* Lynxpoint LPSS devices */
 351         { "INT33C0", LPSS_ADDR(lpt_spi_dev_desc) },
 352         { "INT33C1", LPSS_ADDR(lpt_spi_dev_desc) },
 353         { "INT33C2", LPSS_ADDR(lpt_i2c_dev_desc) },
 354         { "INT33C3", LPSS_ADDR(lpt_i2c_dev_desc) },
 355         { "INT33C4", LPSS_ADDR(lpt_uart_dev_desc) },
 356         { "INT33C5", LPSS_ADDR(lpt_uart_dev_desc) },
 357         { "INT33C6", LPSS_ADDR(lpt_sdio_dev_desc) },
 358         { "INT33C7", },
 359
 360         /* BayTrail LPSS devices */
 361         { "80860F09", LPSS_ADDR(byt_pwm_dev_desc) },
 362         { "80860F0A", LPSS_ADDR(byt_uart_dev_desc) },
 363         { "80860F0E", LPSS_ADDR(byt_spi_dev_desc) },
 364         { "80860F14", LPSS_ADDR(byt_sdio_dev_desc) },
 365         { "80860F41", LPSS_ADDR(byt_i2c_dev_desc) },
 366         { "INT33B2", },
 367         { "INT33FC", },
 368
 369         /* Braswell LPSS devices */
 370         { "80862286", LPSS_ADDR(lpss_dma_desc) },
 371         { "80862288", LPSS_ADDR(bsw_pwm_dev_desc) },
 372         { "8086228A", LPSS_ADDR(bsw_uart_dev_desc) },
 373         { "8086228E", LPSS_ADDR(bsw_spi_dev_desc) },
 374         { "808622C0", LPSS_ADDR(lpss_dma_desc) },
 375         { "808622C1", LPSS_ADDR(bsw_i2c_dev_desc) },
 376
 377         /* Broadwell LPSS devices */
 378         { "INT3430", LPSS_ADDR(lpt_spi_dev_desc) },
 379         { "INT3431", LPSS_ADDR(lpt_spi_dev_desc) },
 380         { "INT3432", LPSS_ADDR(lpt_i2c_dev_desc) },
 381         { "INT3433", LPSS_ADDR(lpt_i2c_dev_desc) },
 382         { "INT3434", LPSS_ADDR(lpt_uart_dev_desc) },
 383         { "INT3435", LPSS_ADDR(lpt_uart_dev_desc) },
 384         { "INT3436", LPSS_ADDR(lpt_sdio_dev_desc) },
 385         { "INT3437", },
 386
 387         /* Wildcat Point LPSS devices */
 388         { "INT3438", LPSS_ADDR(lpt_spi_dev_desc) },
 389
 390         { }
 391 };
 392
 393 #ifdef CONFIG_X86_INTEL_LPSS
 394
 395 static int is_memory(struct acpi_resource *res, void *not_used)
 396 {
 397         struct resource r;
 398
 399         return !acpi_dev_resource_memory(res, &r);
 400 }
 401
 402 /* LPSS main clock device. */
 403 static struct platform_device *lpss_clk_dev;
 404
 405 static inline void lpt_register_clock_device(void)
 406 {
 407         lpss_clk_dev = platform_device_register_simple("clk-lpss-atom",
 408                                                        PLATFORM_DEVID_NONE,
 409                                                        NULL, 0);
 410 }
 411
 412 static int register_device_clock(struct acpi_device *adev,
 413                                  struct lpss_private_data *pdata)
 414 {
 415         const struct lpss_device_desc *dev_desc = pdata->dev_desc;
 416         const char *devname = dev_name(&adev->dev);
 417         struct clk *clk;
 418         struct lpss_clk_data *clk_data;
 419         const char *parent, *clk_name;
 420         void __iomem *prv_base;
 421
 422         if (!lpss_clk_dev)
 423                 lpt_register_clock_device();
 424
 425         if (IS_ERR(lpss_clk_dev))
 426                 return PTR_ERR(lpss_clk_dev);
 427
 428         clk_data = platform_get_drvdata(lpss_clk_dev);
 429         if (!clk_data)
 430                 return -ENODEV;
 431         clk = clk_data->clk;
 432
 433         if (!pdata->mmio_base
 434             || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
 435                 return -ENODATA;
 436
 437         parent = clk_data->name;
 438         prv_base = pdata->mmio_base + dev_desc->prv_offset;
 439
 440         if (pdata->fixed_clk_rate) {
 441                 clk = clk_register_fixed_rate(NULL, devname, parent, 0,
 442                                               pdata->fixed_clk_rate);
 443                 goto out;
 444         }
 445
 446         if (dev_desc->flags & LPSS_CLK_GATE) {
 447                 clk = clk_register_gate(NULL, devname, parent, 0,
 448                                         prv_base, 0, 0, NULL);
 449                 parent = devname;
 450         }
 451
 452         if (dev_desc->flags & LPSS_CLK_DIVIDER) {
 453                 /* Prevent division by zero */
 454                 if (!readl(prv_base))
 455                         writel(LPSS_CLK_DIVIDER_DEF_MASK, prv_base);
 456
 457                 clk_name = kasprintf(GFP_KERNEL, "%s-div", devname);
 458                 if (!clk_name)
 459                         return -ENOMEM;
 460                 clk = clk_register_fractional_divider(NULL, clk_name, parent,
 461                                                       CLK_FRAC_DIVIDER_POWER_OF_TWO_PS,
 462                                                       prv_base, 1, 15, 16, 15, 0, NULL);
 463                 parent = clk_name;
 464
 465                 clk_name = kasprintf(GFP_KERNEL, "%s-update", devname);
 466                 if (!clk_name) {
 467                         kfree(parent);
 468                         return -ENOMEM;
 469                 }
 470                 clk = clk_register_gate(NULL, clk_name, parent,
 471                                         CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
 472                                         prv_base, 31, 0, NULL);
 473                 kfree(parent);
 474                 kfree(clk_name);
 475         }
 476 out:
 477         if (IS_ERR(clk))
 478                 return PTR_ERR(clk);
 479
 480         pdata->clk = clk;
 481         clk_register_clkdev(clk, dev_desc->clk_con_id, devname);
 482         return 0;
 483 }
 484
 485 struct lpss_device_links {
 486         const char *supplier_hid;
 487         const char *supplier_uid;
 488         const char *consumer_hid;
 489         const char *consumer_uid;
 490         u32 flags;
 491         const struct dmi_system_id *dep_missing_ids;
 492 };
 493
 494 /* Please keep this list sorted alphabetically by vendor and model */
 495 static const struct dmi_system_id i2c1_dep_missing_dmi_ids[] = {
 496         {
 497                 .matches = {
 498                         DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 499                         DMI_MATCH(DMI_PRODUCT_NAME, "T200TA"),
 500                 },
 501         },
 502         {}
 503 };
 504
 505 /*
 506  * The _DEP method is used to identify dependencies but instead of creating
 507  * device links for every handle in _DEP, only links in the following list are
 508  * created. That is necessary because, in the general case, _DEP can refer to
 509  * devices that might not have drivers, or that are on different buses, or where
 510  * the supplier is not enumerated until after the consumer is probed.
 511  */
 512 static const struct lpss_device_links lpss_device_links[] = {
 513         /* CHT External sdcard slot controller depends on PMIC I2C ctrl */
 514         {"808622C1", "7", "80860F14", "3", DL_FLAG_PM_RUNTIME},
 515         /* CHT iGPU depends on PMIC I2C controller */
 516         {"808622C1", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
 517         /* BYT iGPU depends on the Embedded Controller I2C controller (UID 1) */
 518         {"80860F41", "1", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME,
 519          i2c1_dep_missing_dmi_ids},
 520         /* BYT CR iGPU depends on PMIC I2C controller (UID 5 on CR) */
 521         {"80860F41", "5", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
 522         /* BYT iGPU depends on PMIC I2C controller (UID 7 on non CR) */
 523         {"80860F41", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
 524 };
 525
 526 static bool acpi_lpss_is_supplier(struct acpi_device *adev,
 527                                   const struct lpss_device_links *link)
 528 {
 529         return acpi_dev_hid_uid_match(adev, link->supplier_hid, link->supplier_uid);
 530 }
 531
 532 static bool acpi_lpss_is_consumer(struct acpi_device *adev,
 533                                   const struct lpss_device_links *link)
 534 {
 535         return acpi_dev_hid_uid_match(adev, link->consumer_hid, link->consumer_uid);
 536 }
 537
 538 struct hid_uid {
 539         const char *hid;
 540         const char *uid;
 541 };
 542
 543 static int match_hid_uid(struct device *dev, const void *data)
 544 {
 545         struct acpi_device *adev = ACPI_COMPANION(dev);
 546         const struct hid_uid *id = data;
 547
 548         if (!adev)
 549                 return 0;
 550
 551         return acpi_dev_hid_uid_match(adev, id->hid, id->uid);
 552 }
 553
 554 static struct device *acpi_lpss_find_device(const char *hid, const char *uid)
 555 {
 556         struct device *dev;
 557
 558         struct hid_uid data = {
 559                 .hid = hid,
 560                 .uid = uid,
 561         };
 562
 563         dev = bus_find_device(&platform_bus_type, NULL, &data, match_hid_uid);
 564         if (dev)
 565                 return dev;
 566
 567         return bus_find_device(&pci_bus_type, NULL, &data, match_hid_uid);
 568 }
 569
 570 static bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle)
 571 {
 572         struct acpi_handle_list dep_devices;
 573         acpi_status status;
 574         int i;
 575
 576         if (!acpi_has_method(adev->handle, "_DEP"))
 577                 return false;
 578
 579         status = acpi_evaluate_reference(adev->handle, "_DEP", NULL,
 580                                          &dep_devices);
 581         if (ACPI_FAILURE(status)) {
 582                 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n");
 583                 return false;
 584         }
 585
 586         for (i = 0; i < dep_devices.count; i++) {
 587                 if (dep_devices.handles[i] == handle)
 588                         return true;
 589         }
 590
 591         return false;
 592 }
 593
 594 static void acpi_lpss_link_consumer(struct device *dev1,
 595                                     const struct lpss_device_links *link)
 596 {
 597         struct device *dev2;
 598
 599         dev2 = acpi_lpss_find_device(link->consumer_hid, link->consumer_uid);
 600         if (!dev2)
 601                 return;
 602
 603         if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))
 604             || acpi_lpss_dep(ACPI_COMPANION(dev2), ACPI_HANDLE(dev1)))
 605                 device_link_add(dev2, dev1, link->flags);
 606
 607         put_device(dev2);
 608 }
 609
 610 static void acpi_lpss_link_supplier(struct device *dev1,
 611                                     const struct lpss_device_links *link)
 612 {
 613         struct device *dev2;
 614
 615         dev2 = acpi_lpss_find_device(link->supplier_hid, link->supplier_uid);
 616         if (!dev2)
 617                 return;
 618
 619         if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))
 620             || acpi_lpss_dep(ACPI_COMPANION(dev1), ACPI_HANDLE(dev2)))
 621                 device_link_add(dev1, dev2, link->flags);
 622
 623         put_device(dev2);
 624 }
 625
 626 static void acpi_lpss_create_device_links(struct acpi_device *adev,
 627                                           struct platform_device *pdev)
 628 {
 629         int i;
 630
 631         for (i = 0; i < ARRAY_SIZE(lpss_device_links); i++) {
 632                 const struct lpss_device_links *link = &lpss_device_links[i];
 633
 634                 if (acpi_lpss_is_supplier(adev, link))
 635                         acpi_lpss_link_consumer(&pdev->dev, link);
 636
 637                 if (acpi_lpss_is_consumer(adev, link))
 638                         acpi_lpss_link_supplier(&pdev->dev, link);
 639         }
 640 }
 641
 642 static int acpi_lpss_create_device(struct acpi_device *adev,
 643                                    const struct acpi_device_id *id)
 644 {
 645         const struct lpss_device_desc *dev_desc;
 646         struct lpss_private_data *pdata;
 647         struct resource_entry *rentry;
 648         struct list_head resource_list;
 649         struct platform_device *pdev;
 650         int ret;
 651
 652         dev_desc = (const struct lpss_device_desc *)id->driver_data;
 653         if (!dev_desc) {
 654                 pdev = acpi_create_platform_device(adev, NULL);
 655                 return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
 656         }
 657         pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
 658         if (!pdata)
 659                 return -ENOMEM;
 660
 661         INIT_LIST_HEAD(&resource_list);
 662         ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL);
 663         if (ret < 0)
 664                 goto err_out;
 665
 666         list_for_each_entry(rentry, &resource_list, node)
 667                 if (resource_type(rentry->res) == IORESOURCE_MEM) {
 668                         if (dev_desc->prv_size_override)
 669                                 pdata->mmio_size = dev_desc->prv_size_override;
 670                         else
 671                                 pdata->mmio_size = resource_size(rentry->res);
 672                         pdata->mmio_base = ioremap(rentry->res->start,
 673                                                    pdata->mmio_size);
 674                         break;
 675                 }
 676
 677         acpi_dev_free_resource_list(&resource_list);
 678
 679         if (!pdata->mmio_base) {
 680                 /* Avoid acpi_bus_attach() instantiating a pdev for this dev. */
 681                 adev->pnp.type.platform_id = 0;
 682                 /* Skip the device, but continue the namespace scan. */
 683                 ret = 0;
 684                 goto err_out;
 685         }
 686
 687         pdata->adev = adev;
 688         pdata->dev_desc = dev_desc;
 689
 690         if (dev_desc->setup)
 691                 dev_desc->setup(pdata);
 692
 693         if (dev_desc->flags & LPSS_CLK) {
 694                 ret = register_device_clock(adev, pdata);
 695                 if (ret) {
 696                         /* Skip the device, but continue the namespace scan. */
 697                         ret = 0;
 698                         goto err_out;
 699                 }
 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                 acpi_lpss_create_device_links(adev, pdev);
 713                 return 1;
 714         }
 715
 716         ret = PTR_ERR(pdev);
 717         adev->driver_data = NULL;
 718
 719  err_out:
 720         kfree(pdata);
 721         return ret;
 722 }
 723
 724 static u32 __lpss_reg_read(struct lpss_private_data *pdata, unsigned int reg)
 725 {
 726         return readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
 727 }
 728
 729 static void __lpss_reg_write(u32 val, struct lpss_private_data *pdata,
 730                              unsigned int reg)
 731 {
 732         writel(val, pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
 733 }
 734
 735 static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
 736 {
 737         struct acpi_device *adev = ACPI_COMPANION(dev);
 738         struct lpss_private_data *pdata;
 739         unsigned long flags;
 740         int ret;
 741
 742         if (WARN_ON(!adev))
 743                 return -ENODEV;
 744
 745         spin_lock_irqsave(&dev->power.lock, flags);
 746         if (pm_runtime_suspended(dev)) {
 747                 ret = -EAGAIN;
 748                 goto out;
 749         }
 750         pdata = acpi_driver_data(adev);
 751         if (WARN_ON(!pdata || !pdata->mmio_base)) {
 752                 ret = -ENODEV;
 753                 goto out;
 754         }
 755         *val = __lpss_reg_read(pdata, reg);
 756         ret = 0;
 757
 758  out:
 759         spin_unlock_irqrestore(&dev->power.lock, flags);
 760         return ret;
 761 }
 762
 763 static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr,
 764                              char *buf)
 765 {
 766         u32 ltr_value = 0;
 767         unsigned int reg;
 768         int ret;
 769
 770         reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;
 771         ret = lpss_reg_read(dev, reg, &ltr_value);
 772         if (ret)
 773                 return ret;
 774
 775         return sysfs_emit(buf, "%08x\n", ltr_value);
 776 }
 777
 778 static ssize_t lpss_ltr_mode_show(struct device *dev,
 779                                   struct device_attribute *attr, char *buf)
 780 {
 781         u32 ltr_mode = 0;
 782         char *outstr;
 783         int ret;
 784
 785         ret = lpss_reg_read(dev, LPSS_GENERAL, &ltr_mode);
 786         if (ret)
 787                 return ret;
 788
 789         outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto";
 790         return sprintf(buf, "%s\n", outstr);
 791 }
 792
 793 static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL);
 794 static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL);
 795 static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL);
 796
 797 static struct attribute *lpss_attrs[] = {
 798         &dev_attr_auto_ltr.attr,
 799         &dev_attr_sw_ltr.attr,
 800         &dev_attr_ltr_mode.attr,
 801         NULL,
 802 };
 803
 804 static const struct attribute_group lpss_attr_group = {
 805         .attrs = lpss_attrs,
 806         .name = "lpss_ltr",
 807 };
 808
 809 static void acpi_lpss_set_ltr(struct device *dev, s32 val)
 810 {
 811         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
 812         u32 ltr_mode, ltr_val;
 813
 814         ltr_mode = __lpss_reg_read(pdata, LPSS_GENERAL);
 815         if (val < 0) {
 816                 if (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) {
 817                         ltr_mode &= ~LPSS_GENERAL_LTR_MODE_SW;
 818                         __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
 819                 }
 820                 return;
 821         }
 822         ltr_val = __lpss_reg_read(pdata, LPSS_SW_LTR) & ~LPSS_LTR_SNOOP_MASK;
 823         if (val >= LPSS_LTR_SNOOP_LAT_CUTOFF) {
 824                 ltr_val |= LPSS_LTR_SNOOP_LAT_32US;
 825                 val = LPSS_LTR_MAX_VAL;
 826         } else if (val > LPSS_LTR_MAX_VAL) {
 827                 ltr_val |= LPSS_LTR_SNOOP_LAT_32US | LPSS_LTR_SNOOP_REQ;
 828                 val >>= LPSS_LTR_SNOOP_LAT_SHIFT;
 829         } else {
 830                 ltr_val |= LPSS_LTR_SNOOP_LAT_1US | LPSS_LTR_SNOOP_REQ;
 831         }
 832         ltr_val |= val;
 833         __lpss_reg_write(ltr_val, pdata, LPSS_SW_LTR);
 834         if (!(ltr_mode & LPSS_GENERAL_LTR_MODE_SW)) {
 835                 ltr_mode |= LPSS_GENERAL_LTR_MODE_SW;
 836                 __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
 837         }
 838 }
 839
 840 #ifdef CONFIG_PM
 841 /**
 842  * acpi_lpss_save_ctx() - Save the private registers of LPSS device
 843  * @dev: LPSS device
 844  * @pdata: pointer to the private data of the LPSS device
 845  *
 846  * Most LPSS devices have private registers which may loose their context when
 847  * the device is powered down. acpi_lpss_save_ctx() saves those registers into
 848  * prv_reg_ctx array.
 849  */
 850 static void acpi_lpss_save_ctx(struct device *dev,
 851                                struct lpss_private_data *pdata)
 852 {
 853         unsigned int i;
 854
 855         for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
 856                 unsigned long offset = i * sizeof(u32);
 857
 858                 pdata->prv_reg_ctx[i] = __lpss_reg_read(pdata, offset);
 859                 dev_dbg(dev, "saving 0x%08x from LPSS reg at offset 0x%02lx\n",
 860                         pdata->prv_reg_ctx[i], offset);
 861         }
 862 }
 863
 864 /**
 865  * acpi_lpss_restore_ctx() - Restore the private registers of LPSS device
 866  * @dev: LPSS device
 867  * @pdata: pointer to the private data of the LPSS device
 868  *
 869  * Restores the registers that were previously stored with acpi_lpss_save_ctx().
 870  */
 871 static void acpi_lpss_restore_ctx(struct device *dev,
 872                                   struct lpss_private_data *pdata)
 873 {
 874         unsigned int i;
 875
 876         for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
 877                 unsigned long offset = i * sizeof(u32);
 878
 879                 __lpss_reg_write(pdata->prv_reg_ctx[i], pdata, offset);
 880                 dev_dbg(dev, "restoring 0x%08x to LPSS reg at offset 0x%02lx\n",
 881                         pdata->prv_reg_ctx[i], offset);
 882         }
 883 }
 884
 885 static void acpi_lpss_d3_to_d0_delay(struct lpss_private_data *pdata)
 886 {
 887         /*
 888          * The following delay is needed or the subsequent write operations may
 889          * fail. The LPSS devices are actually PCI devices and the PCI spec
 890          * expects 10ms delay before the device can be accessed after D3 to D0
 891          * transition. However some platforms like BSW does not need this delay.
 892          */
 893         unsigned int delay = 10;        /* default 10ms delay */
 894
 895         if (pdata->dev_desc->flags & LPSS_NO_D3_DELAY)
 896                 delay = 0;
 897
 898         msleep(delay);
 899 }
 900
 901 static int acpi_lpss_activate(struct device *dev)
 902 {
 903         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
 904         int ret;
 905
 906         ret = acpi_dev_resume(dev);
 907         if (ret)
 908                 return ret;
 909
 910         acpi_lpss_d3_to_d0_delay(pdata);
 911
 912         /*
 913          * This is called only on ->probe() stage where a device is either in
 914          * known state defined by BIOS or most likely powered off. Due to this
 915          * we have to deassert reset line to be sure that ->probe() will
 916          * recognize the device.
 917          */
 918         if (pdata->dev_desc->flags & (LPSS_SAVE_CTX | LPSS_SAVE_CTX_ONCE))
 919                 lpss_deassert_reset(pdata);
 920
 921 #ifdef CONFIG_PM
 922         if (pdata->dev_desc->flags & LPSS_SAVE_CTX_ONCE)
 923                 acpi_lpss_save_ctx(dev, pdata);
 924 #endif
 925
 926         return 0;
 927 }
 928
 929 static void acpi_lpss_dismiss(struct device *dev)
 930 {
 931         acpi_dev_suspend(dev, false);
 932 }
 933
 934 /* IOSF SB for LPSS island */
 935 #define LPSS_IOSF_UNIT_LPIOEP           0xA0
 936 #define LPSS_IOSF_UNIT_LPIO1            0xAB
 937 #define LPSS_IOSF_UNIT_LPIO2            0xAC
 938
 939 #define LPSS_IOSF_PMCSR                 0x84
 940 #define LPSS_PMCSR_D0                   0
 941 #define LPSS_PMCSR_D3hot                3
 942 #define LPSS_PMCSR_Dx_MASK              GENMASK(1, 0)
 943
 944 #define LPSS_IOSF_GPIODEF0              0x154
 945 #define LPSS_GPIODEF0_DMA1_D3           BIT(2)
 946 #define LPSS_GPIODEF0_DMA2_D3           BIT(3)
 947 #define LPSS_GPIODEF0_DMA_D3_MASK       GENMASK(3, 2)
 948 #define LPSS_GPIODEF0_DMA_LLP           BIT(13)
 949
 950 static DEFINE_MUTEX(lpss_iosf_mutex);
 951 static bool lpss_iosf_d3_entered = true;
 952
 953 static void lpss_iosf_enter_d3_state(void)
 954 {
 955         u32 value1 = 0;
 956         u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK | LPSS_GPIODEF0_DMA_LLP;
 957         u32 value2 = LPSS_PMCSR_D3hot;
 958         u32 mask2 = LPSS_PMCSR_Dx_MASK;
 959         /*
 960          * PMC provides an information about actual status of the LPSS devices.
 961          * Here we read the values related to LPSS power island, i.e. LPSS
 962          * devices, excluding both LPSS DMA controllers, along with SCC domain.
 963          */
 964         u32 func_dis, d3_sts_0, pmc_status;
 965         int ret;
 966
 967         ret = pmc_atom_read(PMC_FUNC_DIS, &func_dis);
 968         if (ret)
 969                 return;
 970
 971         mutex_lock(&lpss_iosf_mutex);
 972
 973         ret = pmc_atom_read(PMC_D3_STS_0, &d3_sts_0);
 974         if (ret)
 975                 goto exit;
 976
 977         /*
 978          * Get the status of entire LPSS power island per device basis.
 979          * Shutdown both LPSS DMA controllers if and only if all other devices
 980          * are already in D3hot.
 981          */
 982         pmc_status = (~(d3_sts_0 | func_dis)) & pmc_atom_d3_mask;
 983         if (pmc_status)
 984                 goto exit;
 985
 986         iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE,
 987                         LPSS_IOSF_PMCSR, value2, mask2);
 988
 989         iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2, MBI_CFG_WRITE,
 990                         LPSS_IOSF_PMCSR, value2, mask2);
 991
 992         iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE,
 993                         LPSS_IOSF_GPIODEF0, value1, mask1);
 994
 995         lpss_iosf_d3_entered = true;
 996
 997 exit:
 998         mutex_unlock(&lpss_iosf_mutex);
 999 }
1000
1001 static void lpss_iosf_exit_d3_state(void)
1002 {
1003         u32 value1 = LPSS_GPIODEF0_DMA1_D3 | LPSS_GPIODEF0_DMA2_D3 |
1004                      LPSS_GPIODEF0_DMA_LLP;
1005         u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK | LPSS_GPIODEF0_DMA_LLP;
1006         u32 value2 = LPSS_PMCSR_D0;
1007         u32 mask2 = LPSS_PMCSR_Dx_MASK;
1008
1009         mutex_lock(&lpss_iosf_mutex);
1010
1011         if (!lpss_iosf_d3_entered)
1012                 goto exit;
1013
1014         lpss_iosf_d3_entered = false;
1015
1016         iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE,
1017                         LPSS_IOSF_GPIODEF0, value1, mask1);
1018
1019         iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2, MBI_CFG_WRITE,
1020                         LPSS_IOSF_PMCSR, value2, mask2);
1021
1022         iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE,
1023                         LPSS_IOSF_PMCSR, value2, mask2);
1024
1025 exit:
1026         mutex_unlock(&lpss_iosf_mutex);
1027 }
1028
1029 static int acpi_lpss_suspend(struct device *dev, bool wakeup)
1030 {
1031         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1032         int ret;
1033
1034         if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
1035                 acpi_lpss_save_ctx(dev, pdata);
1036
1037         ret = acpi_dev_suspend(dev, wakeup);
1038
1039         /*
1040          * This call must be last in the sequence, otherwise PMC will return
1041          * wrong status for devices being about to be powered off. See
1042          * lpss_iosf_enter_d3_state() for further information.
1043          */
1044         if (acpi_target_system_state() == ACPI_STATE_S0 &&
1045             lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
1046                 lpss_iosf_enter_d3_state();
1047
1048         return ret;
1049 }
1050
1051 static int acpi_lpss_resume(struct device *dev)
1052 {
1053         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1054         int ret;
1055
1056         /*
1057          * This call is kept first to be in symmetry with
1058          * acpi_lpss_runtime_suspend() one.
1059          */
1060         if (lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
1061                 lpss_iosf_exit_d3_state();
1062
1063         ret = acpi_dev_resume(dev);
1064         if (ret)
1065                 return ret;
1066
1067         acpi_lpss_d3_to_d0_delay(pdata);
1068
1069         if (pdata->dev_desc->flags & (LPSS_SAVE_CTX | LPSS_SAVE_CTX_ONCE))
1070                 acpi_lpss_restore_ctx(dev, pdata);
1071
1072         return 0;
1073 }
1074
1075 #ifdef CONFIG_PM_SLEEP
1076 static int acpi_lpss_do_suspend_late(struct device *dev)
1077 {
1078         int ret;
1079
1080         if (dev_pm_skip_suspend(dev))
1081                 return 0;
1082
1083         ret = pm_generic_suspend_late(dev);
1084         return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev));
1085 }
1086
1087 static int acpi_lpss_suspend_late(struct device *dev)
1088 {
1089         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1090
1091         if (pdata->dev_desc->resume_from_noirq)
1092                 return 0;
1093
1094         return acpi_lpss_do_suspend_late(dev);
1095 }
1096
1097 static int acpi_lpss_suspend_noirq(struct device *dev)
1098 {
1099         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1100         int ret;
1101
1102         if (pdata->dev_desc->resume_from_noirq) {
1103                 /*
1104                  * The driver's ->suspend_late callback will be invoked by
1105                  * acpi_lpss_do_suspend_late(), with the assumption that the
1106                  * driver really wanted to run that code in ->suspend_noirq, but
1107                  * it could not run after acpi_dev_suspend() and the driver
1108                  * expected the latter to be called in the "late" phase.
1109                  */
1110                 ret = acpi_lpss_do_suspend_late(dev);
1111                 if (ret)
1112                         return ret;
1113         }
1114
1115         return acpi_subsys_suspend_noirq(dev);
1116 }
1117
1118 static int acpi_lpss_do_resume_early(struct device *dev)
1119 {
1120         int ret = acpi_lpss_resume(dev);
1121
1122         return ret ? ret : pm_generic_resume_early(dev);
1123 }
1124
1125 static int acpi_lpss_resume_early(struct device *dev)
1126 {
1127         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1128
1129         if (pdata->dev_desc->resume_from_noirq)
1130                 return 0;
1131
1132         if (dev_pm_skip_resume(dev))
1133                 return 0;
1134
1135         return acpi_lpss_do_resume_early(dev);
1136 }
1137
1138 static int acpi_lpss_resume_noirq(struct device *dev)
1139 {
1140         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1141         int ret;
1142
1143         /* Follow acpi_subsys_resume_noirq(). */
1144         if (dev_pm_skip_resume(dev))
1145                 return 0;
1146
1147         ret = pm_generic_resume_noirq(dev);
1148         if (ret)
1149                 return ret;
1150
1151         if (!pdata->dev_desc->resume_from_noirq)
1152                 return 0;
1153
1154         /*
1155          * The driver's ->resume_early callback will be invoked by
1156          * acpi_lpss_do_resume_early(), with the assumption that the driver
1157          * really wanted to run that code in ->resume_noirq, but it could not
1158          * run before acpi_dev_resume() and the driver expected the latter to be
1159          * called in the "early" phase.
1160          */
1161         return acpi_lpss_do_resume_early(dev);
1162 }
1163
1164 static int acpi_lpss_do_restore_early(struct device *dev)
1165 {
1166         int ret = acpi_lpss_resume(dev);
1167
1168         return ret ? ret : pm_generic_restore_early(dev);
1169 }
1170
1171 static int acpi_lpss_restore_early(struct device *dev)
1172 {
1173         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1174
1175         if (pdata->dev_desc->resume_from_noirq)
1176                 return 0;
1177
1178         return acpi_lpss_do_restore_early(dev);
1179 }
1180
1181 static int acpi_lpss_restore_noirq(struct device *dev)
1182 {
1183         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1184         int ret;
1185
1186         ret = pm_generic_restore_noirq(dev);
1187         if (ret)
1188                 return ret;
1189
1190         if (!pdata->dev_desc->resume_from_noirq)
1191                 return 0;
1192
1193         /* This is analogous to what happens in acpi_lpss_resume_noirq(). */
1194         return acpi_lpss_do_restore_early(dev);
1195 }
1196
1197 static int acpi_lpss_do_poweroff_late(struct device *dev)
1198 {
1199         int ret = pm_generic_poweroff_late(dev);
1200
1201         return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev));
1202 }
1203
1204 static int acpi_lpss_poweroff_late(struct device *dev)
1205 {
1206         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1207
1208         if (dev_pm_skip_suspend(dev))
1209                 return 0;
1210
1211         if (pdata->dev_desc->resume_from_noirq)
1212                 return 0;
1213
1214         return acpi_lpss_do_poweroff_late(dev);
1215 }
1216
1217 static int acpi_lpss_poweroff_noirq(struct device *dev)
1218 {
1219         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1220
1221         if (dev_pm_skip_suspend(dev))
1222                 return 0;
1223
1224         if (pdata->dev_desc->resume_from_noirq) {
1225                 /* This is analogous to the acpi_lpss_suspend_noirq() case. */
1226                 int ret = acpi_lpss_do_poweroff_late(dev);
1227
1228                 if (ret)
1229                         return ret;
1230         }
1231
1232         return pm_generic_poweroff_noirq(dev);
1233 }
1234 #endif /* CONFIG_PM_SLEEP */
1235
1236 static int acpi_lpss_runtime_suspend(struct device *dev)
1237 {
1238         int ret = pm_generic_runtime_suspend(dev);
1239
1240         return ret ? ret : acpi_lpss_suspend(dev, true);
1241 }
1242
1243 static int acpi_lpss_runtime_resume(struct device *dev)
1244 {
1245         int ret = acpi_lpss_resume(dev);
1246
1247         return ret ? ret : pm_generic_runtime_resume(dev);
1248 }
1249 #endif /* CONFIG_PM */
1250
1251 static struct dev_pm_domain acpi_lpss_pm_domain = {
1252 #ifdef CONFIG_PM
1253         .activate = acpi_lpss_activate,
1254         .dismiss = acpi_lpss_dismiss,
1255 #endif
1256         .ops = {
1257 #ifdef CONFIG_PM
1258 #ifdef CONFIG_PM_SLEEP
1259                 .prepare = acpi_subsys_prepare,
1260                 .complete = acpi_subsys_complete,
1261                 .suspend = acpi_subsys_suspend,
1262                 .suspend_late = acpi_lpss_suspend_late,
1263                 .suspend_noirq = acpi_lpss_suspend_noirq,
1264                 .resume_noirq = acpi_lpss_resume_noirq,
1265                 .resume_early = acpi_lpss_resume_early,
1266                 .freeze = acpi_subsys_freeze,
1267                 .poweroff = acpi_subsys_poweroff,
1268                 .poweroff_late = acpi_lpss_poweroff_late,
1269                 .poweroff_noirq = acpi_lpss_poweroff_noirq,
1270                 .restore_noirq = acpi_lpss_restore_noirq,
1271                 .restore_early = acpi_lpss_restore_early,
1272 #endif
1273                 .runtime_suspend = acpi_lpss_runtime_suspend,
1274                 .runtime_resume = acpi_lpss_runtime_resume,
1275 #endif
1276         },
1277 };
1278
1279 static int acpi_lpss_platform_notify(struct notifier_block *nb,
1280                                      unsigned long action, void *data)
1281 {
1282         struct platform_device *pdev = to_platform_device(data);
1283         struct lpss_private_data *pdata;
1284         struct acpi_device *adev;
1285         const struct acpi_device_id *id;
1286
1287         id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);
1288         if (!id || !id->driver_data)
1289                 return 0;
1290
1291         adev = ACPI_COMPANION(&pdev->dev);
1292         if (!adev)
1293                 return 0;
1294
1295         pdata = acpi_driver_data(adev);
1296         if (!pdata)
1297                 return 0;
1298
1299         if (pdata->mmio_base &&
1300             pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {
1301                 dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");
1302                 return 0;
1303         }
1304
1305         switch (action) {
1306         case BUS_NOTIFY_BIND_DRIVER:
1307                 dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);
1308                 break;
1309         case BUS_NOTIFY_DRIVER_NOT_BOUND:
1310         case BUS_NOTIFY_UNBOUND_DRIVER:
1311                 dev_pm_domain_set(&pdev->dev, NULL);
1312                 break;
1313         case BUS_NOTIFY_ADD_DEVICE:
1314                 dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);
1315                 if (pdata->dev_desc->flags & LPSS_LTR)
1316                         return sysfs_create_group(&pdev->dev.kobj,
1317                                                   &lpss_attr_group);
1318                 break;
1319         case BUS_NOTIFY_DEL_DEVICE:
1320                 if (pdata->dev_desc->flags & LPSS_LTR)
1321                         sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
1322                 dev_pm_domain_set(&pdev->dev, NULL);
1323                 break;
1324         default:
1325                 break;
1326         }
1327
1328         return 0;
1329 }
1330
1331 static struct notifier_block acpi_lpss_nb = {
1332         .notifier_call = acpi_lpss_platform_notify,
1333 };
1334
1335 static void acpi_lpss_bind(struct device *dev)
1336 {
1337         struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
1338
1339         if (!pdata || !pdata->mmio_base || !(pdata->dev_desc->flags & LPSS_LTR))
1340                 return;
1341
1342         if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE)
1343                 dev->power.set_latency_tolerance = acpi_lpss_set_ltr;
1344         else
1345                 dev_err(dev, "MMIO size insufficient to access LTR\n");
1346 }
1347
1348 static void acpi_lpss_unbind(struct device *dev)
1349 {
1350         dev->power.set_latency_tolerance = NULL;
1351 }
1352
1353 static struct acpi_scan_handler lpss_handler = {
1354         .ids = acpi_lpss_device_ids,
1355         .attach = acpi_lpss_create_device,
1356         .bind = acpi_lpss_bind,
1357         .unbind = acpi_lpss_unbind,
1358 };
1359
1360 void __init acpi_lpss_init(void)
1361 {
1362         const struct x86_cpu_id *id;
1363         int ret;
1364
1365         ret = lpss_atom_clk_init();
1366         if (ret)
1367                 return;
1368
1369         id = x86_match_cpu(lpss_cpu_ids);
1370         if (id)
1371                 lpss_quirks |= LPSS_QUIRK_ALWAYS_POWER_ON;
1372
1373         bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
1374         acpi_scan_add_handler(&lpss_handler);
1375 }
1376
1377 #else
1378
1379 static struct acpi_scan_handler lpss_handler = {
1380         .ids = acpi_lpss_device_ids,
1381 };
1382
1383 void __init acpi_lpss_init(void)
1384 {
1385         acpi_scan_add_handler(&lpss_handler);
1386 }
1387
1388 #endif /* CONFIG_X86_INTEL_LPSS */