+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * ACPI support for Intel Lynxpoint LPSS.
- *
- * Copyright (C) 2013, Intel Corporation
- * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
- * Rafael J. Wysocki <rafael.j.wysocki@intel.com>
- */
-
-#include <linux/acpi.h>
-#include <linux/clkdev.h>
-#include <linux/clk-provider.h>
-#include <linux/dmi.h>
-#include <linux/err.h>
-#include <linux/io.h>
-#include <linux/mutex.h>
-#include <linux/pci.h>
-#include <linux/platform_device.h>
-#include <linux/platform_data/x86/clk-lpss.h>
-#include <linux/platform_data/x86/pmc_atom.h>
-#include <linux/pm_domain.h>
-#include <linux/pm_runtime.h>
-#include <linux/pwm.h>
-#include <linux/pxa2xx_ssp.h>
-#include <linux/suspend.h>
-#include <linux/delay.h>
-
-#include "internal.h"
-
-#ifdef CONFIG_X86_INTEL_LPSS
-
-#include <asm/cpu_device_id.h>
-#include <asm/intel-family.h>
-#include <asm/iosf_mbi.h>
-
-#define LPSS_ADDR(desc) ((unsigned long)&desc)
-
-#define LPSS_CLK_SIZE 0x04
-#define LPSS_LTR_SIZE 0x18
-
-/* Offsets relative to LPSS_PRIVATE_OFFSET */
-#define LPSS_CLK_DIVIDER_DEF_MASK (BIT(1) | BIT(16))
-#define LPSS_RESETS 0x04
-#define LPSS_RESETS_RESET_FUNC BIT(0)
-#define LPSS_RESETS_RESET_APB BIT(1)
-#define LPSS_GENERAL 0x08
-#define LPSS_GENERAL_LTR_MODE_SW BIT(2)
-#define LPSS_GENERAL_UART_RTS_OVRD BIT(3)
-#define LPSS_SW_LTR 0x10
-#define LPSS_AUTO_LTR 0x14
-#define LPSS_LTR_SNOOP_REQ BIT(15)
-#define LPSS_LTR_SNOOP_MASK 0x0000FFFF
-#define LPSS_LTR_SNOOP_LAT_1US 0x800
-#define LPSS_LTR_SNOOP_LAT_32US 0xC00
-#define LPSS_LTR_SNOOP_LAT_SHIFT 5
-#define LPSS_LTR_SNOOP_LAT_CUTOFF 3000
-#define LPSS_LTR_MAX_VAL 0x3FF
-#define LPSS_TX_INT 0x20
-#define LPSS_TX_INT_MASK BIT(1)
-
-#define LPSS_PRV_REG_COUNT 9
-
-/* LPSS Flags */
-#define LPSS_CLK BIT(0)
-#define LPSS_CLK_GATE BIT(1)
-#define LPSS_CLK_DIVIDER BIT(2)
-#define LPSS_LTR BIT(3)
-#define LPSS_SAVE_CTX BIT(4)
-/*
- * For some devices the DSDT AML code for another device turns off the device
- * before our suspend handler runs, causing us to read/save all 1-s (0xffffffff)
- * as ctx register values.
- * Luckily these devices always use the same ctx register values, so we can
- * work around this by saving the ctx registers once on activation.
- */
-#define LPSS_SAVE_CTX_ONCE BIT(5)
-#define LPSS_NO_D3_DELAY BIT(6)
-
-struct lpss_private_data;
-
-struct lpss_device_desc {
- unsigned int flags;
- const char *clk_con_id;
- unsigned int prv_offset;
- size_t prv_size_override;
- const struct property_entry *properties;
- void (*setup)(struct lpss_private_data *pdata);
- bool resume_from_noirq;
-};
-
-static const struct lpss_device_desc lpss_dma_desc = {
- .flags = LPSS_CLK,
-};
-
-struct lpss_private_data {
- struct acpi_device *adev;
- void __iomem *mmio_base;
- resource_size_t mmio_size;
- unsigned int fixed_clk_rate;
- struct clk *clk;
- const struct lpss_device_desc *dev_desc;
- u32 prv_reg_ctx[LPSS_PRV_REG_COUNT];
-};
-
-/* Devices which need to be in D3 before lpss_iosf_enter_d3_state() proceeds */
-static u32 pmc_atom_d3_mask = 0xfe000ffe;
-
-/* LPSS run time quirks */
-static unsigned int lpss_quirks;
-
-/*
- * LPSS_QUIRK_ALWAYS_POWER_ON: override power state for LPSS DMA device.
- *
- * The LPSS DMA controller has neither _PS0 nor _PS3 method. Moreover
- * it can be powered off automatically whenever the last LPSS device goes down.
- * In case of no power any access to the DMA controller will hang the system.
- * The behaviour is reproduced on some HP laptops based on Intel BayTrail as
- * well as on ASuS T100TA transformer.
- *
- * This quirk overrides power state of entire LPSS island to keep DMA powered
- * on whenever we have at least one other device in use.
- */
-#define LPSS_QUIRK_ALWAYS_POWER_ON BIT(0)
-
-/* UART Component Parameter Register */
-#define LPSS_UART_CPR 0xF4
-#define LPSS_UART_CPR_AFCE BIT(4)
-
-static void lpss_uart_setup(struct lpss_private_data *pdata)
-{
- unsigned int offset;
- u32 val;
-
- offset = pdata->dev_desc->prv_offset + LPSS_TX_INT;
- val = readl(pdata->mmio_base + offset);
- writel(val | LPSS_TX_INT_MASK, pdata->mmio_base + offset);
-
- val = readl(pdata->mmio_base + LPSS_UART_CPR);
- if (!(val & LPSS_UART_CPR_AFCE)) {
- offset = pdata->dev_desc->prv_offset + LPSS_GENERAL;
- val = readl(pdata->mmio_base + offset);
- val |= LPSS_GENERAL_UART_RTS_OVRD;
- writel(val, pdata->mmio_base + offset);
- }
-}
-
-static void lpss_deassert_reset(struct lpss_private_data *pdata)
-{
- unsigned int offset;
- u32 val;
-
- offset = pdata->dev_desc->prv_offset + LPSS_RESETS;
- val = readl(pdata->mmio_base + offset);
- val |= LPSS_RESETS_RESET_APB | LPSS_RESETS_RESET_FUNC;
- writel(val, pdata->mmio_base + offset);
-}
-
-/*
- * BYT PWM used for backlight control by the i915 driver on systems without
- * the Crystal Cove PMIC.
- */
-static struct pwm_lookup byt_pwm_lookup[] = {
- PWM_LOOKUP_WITH_MODULE("80860F09:00", 0, "0000:00:02.0",
- "pwm_soc_backlight", 0, PWM_POLARITY_NORMAL,
- "pwm-lpss-platform"),
-};
-
-static void byt_pwm_setup(struct lpss_private_data *pdata)
-{
- /* Only call pwm_add_table for the first PWM controller */
- if (acpi_dev_uid_match(pdata->adev, 1))
- pwm_add_table(byt_pwm_lookup, ARRAY_SIZE(byt_pwm_lookup));
-}
-
-#define LPSS_I2C_ENABLE 0x6c
-
-static void byt_i2c_setup(struct lpss_private_data *pdata)
-{
- acpi_handle handle = pdata->adev->handle;
- unsigned long long shared_host = 0;
- acpi_status status;
- u64 uid;
-
- /* Expected to always be successfull, but better safe then sorry */
- if (!acpi_dev_uid_to_integer(pdata->adev, &uid) && uid) {
- /* Detect I2C bus shared with PUNIT and ignore its d3 status */
- status = acpi_evaluate_integer(handle, "_SEM", NULL, &shared_host);
- if (ACPI_SUCCESS(status) && shared_host)
- pmc_atom_d3_mask &= ~(BIT_LPSS2_F1_I2C1 << (uid - 1));
- }
-
- lpss_deassert_reset(pdata);
-
- if (readl(pdata->mmio_base + pdata->dev_desc->prv_offset))
- pdata->fixed_clk_rate = 133000000;
-
- writel(0, pdata->mmio_base + LPSS_I2C_ENABLE);
-}
-
-/*
- * BSW PWM1 is used for backlight control by the i915 driver
- * BSW PWM2 is used for backlight control for fixed (etched into the glass)
- * touch controls on some models. These touch-controls have specialized
- * drivers which know they need the "pwm_soc_lpss_2" con-id.
- */
-static struct pwm_lookup bsw_pwm_lookup[] = {
- PWM_LOOKUP_WITH_MODULE("80862288:00", 0, "0000:00:02.0",
- "pwm_soc_backlight", 0, PWM_POLARITY_NORMAL,
- "pwm-lpss-platform"),
- PWM_LOOKUP_WITH_MODULE("80862289:00", 0, NULL,
- "pwm_soc_lpss_2", 0, PWM_POLARITY_NORMAL,
- "pwm-lpss-platform"),
-};
-
-static void bsw_pwm_setup(struct lpss_private_data *pdata)
-{
- /* Only call pwm_add_table for the first PWM controller */
- if (acpi_dev_uid_match(pdata->adev, 1))
- pwm_add_table(bsw_pwm_lookup, ARRAY_SIZE(bsw_pwm_lookup));
-}
-
-static const struct property_entry lpt_spi_properties[] = {
- PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_LPT_SSP),
- { }
-};
-
-static const struct lpss_device_desc lpt_spi_dev_desc = {
- .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR
- | LPSS_SAVE_CTX,
- .prv_offset = 0x800,
- .properties = lpt_spi_properties,
-};
-
-static const struct lpss_device_desc lpt_i2c_dev_desc = {
- .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_LTR | LPSS_SAVE_CTX,
- .prv_offset = 0x800,
-};
-
-static struct property_entry uart_properties[] = {
- PROPERTY_ENTRY_U32("reg-io-width", 4),
- PROPERTY_ENTRY_U32("reg-shift", 2),
- PROPERTY_ENTRY_BOOL("snps,uart-16550-compatible"),
- { },
-};
-
-static const struct lpss_device_desc lpt_uart_dev_desc = {
- .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR
- | LPSS_SAVE_CTX,
- .clk_con_id = "baudclk",
- .prv_offset = 0x800,
- .setup = lpss_uart_setup,
- .properties = uart_properties,
-};
-
-static const struct lpss_device_desc lpt_sdio_dev_desc = {
- .flags = LPSS_LTR,
- .prv_offset = 0x1000,
- .prv_size_override = 0x1018,
-};
-
-static const struct lpss_device_desc byt_pwm_dev_desc = {
- .flags = LPSS_SAVE_CTX,
- .prv_offset = 0x800,
- .setup = byt_pwm_setup,
-};
-
-static const struct lpss_device_desc bsw_pwm_dev_desc = {
- .flags = LPSS_SAVE_CTX_ONCE | LPSS_NO_D3_DELAY,
- .prv_offset = 0x800,
- .setup = bsw_pwm_setup,
- .resume_from_noirq = true,
-};
-
-static const struct lpss_device_desc bsw_pwm2_dev_desc = {
- .flags = LPSS_SAVE_CTX_ONCE | LPSS_NO_D3_DELAY,
- .prv_offset = 0x800,
- .resume_from_noirq = true,
-};
-
-static const struct lpss_device_desc byt_uart_dev_desc = {
- .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
- .clk_con_id = "baudclk",
- .prv_offset = 0x800,
- .setup = lpss_uart_setup,
- .properties = uart_properties,
-};
-
-static const struct lpss_device_desc bsw_uart_dev_desc = {
- .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX
- | LPSS_NO_D3_DELAY,
- .clk_con_id = "baudclk",
- .prv_offset = 0x800,
- .setup = lpss_uart_setup,
- .properties = uart_properties,
-};
-
-static const struct property_entry byt_spi_properties[] = {
- PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_BYT_SSP),
- { }
-};
-
-static const struct lpss_device_desc byt_spi_dev_desc = {
- .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX,
- .prv_offset = 0x400,
- .properties = byt_spi_properties,
-};
-
-static const struct lpss_device_desc byt_sdio_dev_desc = {
- .flags = LPSS_CLK,
-};
-
-static const struct lpss_device_desc byt_i2c_dev_desc = {
- .flags = LPSS_CLK | LPSS_SAVE_CTX,
- .prv_offset = 0x800,
- .setup = byt_i2c_setup,
- .resume_from_noirq = true,
-};
-
-static const struct lpss_device_desc bsw_i2c_dev_desc = {
- .flags = LPSS_CLK | LPSS_SAVE_CTX | LPSS_NO_D3_DELAY,
- .prv_offset = 0x800,
- .setup = byt_i2c_setup,
- .resume_from_noirq = true,
-};
-
-static const struct property_entry bsw_spi_properties[] = {
- PROPERTY_ENTRY_U32("intel,spi-pxa2xx-type", LPSS_BSW_SSP),
- { }
-};
-
-static const struct lpss_device_desc bsw_spi_dev_desc = {
- .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX
- | LPSS_NO_D3_DELAY,
- .prv_offset = 0x400,
- .setup = lpss_deassert_reset,
- .properties = bsw_spi_properties,
-};
-
-static const struct x86_cpu_id lpss_cpu_ids[] = {
- X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT, NULL),
- X86_MATCH_INTEL_FAM6_MODEL(ATOM_AIRMONT, NULL),
- {}
-};
-
-#else
-
-#define LPSS_ADDR(desc) (0UL)
-
-#endif /* CONFIG_X86_INTEL_LPSS */
-
-static const struct acpi_device_id acpi_lpss_device_ids[] = {
- /* Generic LPSS devices */
- { "INTL9C60", LPSS_ADDR(lpss_dma_desc) },
-
- /* Lynxpoint LPSS devices */
- { "INT33C0", LPSS_ADDR(lpt_spi_dev_desc) },
- { "INT33C1", LPSS_ADDR(lpt_spi_dev_desc) },
- { "INT33C2", LPSS_ADDR(lpt_i2c_dev_desc) },
- { "INT33C3", LPSS_ADDR(lpt_i2c_dev_desc) },
- { "INT33C4", LPSS_ADDR(lpt_uart_dev_desc) },
- { "INT33C5", LPSS_ADDR(lpt_uart_dev_desc) },
- { "INT33C6", LPSS_ADDR(lpt_sdio_dev_desc) },
-
- /* BayTrail LPSS devices */
- { "80860F09", LPSS_ADDR(byt_pwm_dev_desc) },
- { "80860F0A", LPSS_ADDR(byt_uart_dev_desc) },
- { "80860F0E", LPSS_ADDR(byt_spi_dev_desc) },
- { "80860F14", LPSS_ADDR(byt_sdio_dev_desc) },
- { "80860F41", LPSS_ADDR(byt_i2c_dev_desc) },
-
- /* Braswell LPSS devices */
- { "80862286", LPSS_ADDR(lpss_dma_desc) },
- { "80862288", LPSS_ADDR(bsw_pwm_dev_desc) },
- { "80862289", LPSS_ADDR(bsw_pwm2_dev_desc) },
- { "8086228A", LPSS_ADDR(bsw_uart_dev_desc) },
- { "8086228E", LPSS_ADDR(bsw_spi_dev_desc) },
- { "808622C0", LPSS_ADDR(lpss_dma_desc) },
- { "808622C1", LPSS_ADDR(bsw_i2c_dev_desc) },
-
- /* Broadwell LPSS devices */
- { "INT3430", LPSS_ADDR(lpt_spi_dev_desc) },
- { "INT3431", LPSS_ADDR(lpt_spi_dev_desc) },
- { "INT3432", LPSS_ADDR(lpt_i2c_dev_desc) },
- { "INT3433", LPSS_ADDR(lpt_i2c_dev_desc) },
- { "INT3434", LPSS_ADDR(lpt_uart_dev_desc) },
- { "INT3435", LPSS_ADDR(lpt_uart_dev_desc) },
- { "INT3436", LPSS_ADDR(lpt_sdio_dev_desc) },
-
- /* Wildcat Point LPSS devices */
- { "INT3438", LPSS_ADDR(lpt_spi_dev_desc) },
-
- { }
-};
-
-#ifdef CONFIG_X86_INTEL_LPSS
-
-/* LPSS main clock device. */
-static struct platform_device *lpss_clk_dev;
-
-static inline void lpt_register_clock_device(void)
-{
- lpss_clk_dev = platform_device_register_simple("clk-lpss-atom",
- PLATFORM_DEVID_NONE,
- NULL, 0);
-}
-
-static int register_device_clock(struct acpi_device *adev,
- struct lpss_private_data *pdata)
-{
- const struct lpss_device_desc *dev_desc = pdata->dev_desc;
- const char *devname = dev_name(&adev->dev);
- struct clk *clk;
- struct lpss_clk_data *clk_data;
- const char *parent, *clk_name;
- void __iomem *prv_base;
-
- if (!lpss_clk_dev)
- lpt_register_clock_device();
-
- if (IS_ERR(lpss_clk_dev))
- return PTR_ERR(lpss_clk_dev);
-
- clk_data = platform_get_drvdata(lpss_clk_dev);
- if (!clk_data)
- return -ENODEV;
- clk = clk_data->clk;
-
- if (!pdata->mmio_base
- || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
- return -ENODATA;
-
- parent = clk_data->name;
- prv_base = pdata->mmio_base + dev_desc->prv_offset;
-
- if (pdata->fixed_clk_rate) {
- clk = clk_register_fixed_rate(NULL, devname, parent, 0,
- pdata->fixed_clk_rate);
- goto out;
- }
-
- if (dev_desc->flags & LPSS_CLK_GATE) {
- clk = clk_register_gate(NULL, devname, parent, 0,
- prv_base, 0, 0, NULL);
- parent = devname;
- }
-
- if (dev_desc->flags & LPSS_CLK_DIVIDER) {
- /* Prevent division by zero */
- if (!readl(prv_base))
- writel(LPSS_CLK_DIVIDER_DEF_MASK, prv_base);
-
- clk_name = kasprintf(GFP_KERNEL, "%s-div", devname);
- if (!clk_name)
- return -ENOMEM;
- clk = clk_register_fractional_divider(NULL, clk_name, parent,
- 0, prv_base, 1, 15, 16, 15,
- CLK_FRAC_DIVIDER_POWER_OF_TWO_PS,
- NULL);
- parent = clk_name;
-
- clk_name = kasprintf(GFP_KERNEL, "%s-update", devname);
- if (!clk_name) {
- kfree(parent);
- return -ENOMEM;
- }
- clk = clk_register_gate(NULL, clk_name, parent,
- CLK_SET_RATE_PARENT | CLK_SET_RATE_GATE,
- prv_base, 31, 0, NULL);
- kfree(parent);
- kfree(clk_name);
- }
-out:
- if (IS_ERR(clk))
- return PTR_ERR(clk);
-
- pdata->clk = clk;
- clk_register_clkdev(clk, dev_desc->clk_con_id, devname);
- return 0;
-}
-
-struct lpss_device_links {
- const char *supplier_hid;
- const char *supplier_uid;
- const char *consumer_hid;
- const char *consumer_uid;
- u32 flags;
- const struct dmi_system_id *dep_missing_ids;
-};
-
-/* Please keep this list sorted alphabetically by vendor and model */
-static const struct dmi_system_id i2c1_dep_missing_dmi_ids[] = {
- {
- .matches = {
- DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
- DMI_MATCH(DMI_PRODUCT_NAME, "T200TA"),
- },
- },
- {}
-};
-
-/*
- * The _DEP method is used to identify dependencies but instead of creating
- * device links for every handle in _DEP, only links in the following list are
- * created. That is necessary because, in the general case, _DEP can refer to
- * devices that might not have drivers, or that are on different buses, or where
- * the supplier is not enumerated until after the consumer is probed.
- */
-static const struct lpss_device_links lpss_device_links[] = {
- /* CHT External sdcard slot controller depends on PMIC I2C ctrl */
- {"808622C1", "7", "80860F14", "3", DL_FLAG_PM_RUNTIME},
- /* CHT iGPU depends on PMIC I2C controller */
- {"808622C1", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
- /* BYT iGPU depends on the Embedded Controller I2C controller (UID 1) */
- {"80860F41", "1", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME,
- i2c1_dep_missing_dmi_ids},
- /* BYT CR iGPU depends on PMIC I2C controller (UID 5 on CR) */
- {"80860F41", "5", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
- /* BYT iGPU depends on PMIC I2C controller (UID 7 on non CR) */
- {"80860F41", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME},
-};
-
-static bool acpi_lpss_is_supplier(struct acpi_device *adev,
- const struct lpss_device_links *link)
-{
- return acpi_dev_hid_uid_match(adev, link->supplier_hid, link->supplier_uid);
-}
-
-static bool acpi_lpss_is_consumer(struct acpi_device *adev,
- const struct lpss_device_links *link)
-{
- return acpi_dev_hid_uid_match(adev, link->consumer_hid, link->consumer_uid);
-}
-
-struct hid_uid {
- const char *hid;
- const char *uid;
-};
-
-static int match_hid_uid(struct device *dev, const void *data)
-{
- struct acpi_device *adev = ACPI_COMPANION(dev);
- const struct hid_uid *id = data;
-
- if (!adev)
- return 0;
-
- return acpi_dev_hid_uid_match(adev, id->hid, id->uid);
-}
-
-static struct device *acpi_lpss_find_device(const char *hid, const char *uid)
-{
- struct device *dev;
-
- struct hid_uid data = {
- .hid = hid,
- .uid = uid,
- };
-
- dev = bus_find_device(&platform_bus_type, NULL, &data, match_hid_uid);
- if (dev)
- return dev;
-
- return bus_find_device(&pci_bus_type, NULL, &data, match_hid_uid);
-}
-
-static void acpi_lpss_link_consumer(struct device *dev1,
- const struct lpss_device_links *link)
-{
- struct device *dev2;
-
- dev2 = acpi_lpss_find_device(link->consumer_hid, link->consumer_uid);
- if (!dev2)
- return;
-
- if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))
- || acpi_device_dep(ACPI_HANDLE(dev2), ACPI_HANDLE(dev1)))
- device_link_add(dev2, dev1, link->flags);
-
- put_device(dev2);
-}
-
-static void acpi_lpss_link_supplier(struct device *dev1,
- const struct lpss_device_links *link)
-{
- struct device *dev2;
-
- dev2 = acpi_lpss_find_device(link->supplier_hid, link->supplier_uid);
- if (!dev2)
- return;
-
- if ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids))
- || acpi_device_dep(ACPI_HANDLE(dev1), ACPI_HANDLE(dev2)))
- device_link_add(dev1, dev2, link->flags);
-
- put_device(dev2);
-}
-
-static void acpi_lpss_create_device_links(struct acpi_device *adev,
- struct platform_device *pdev)
-{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(lpss_device_links); i++) {
- const struct lpss_device_links *link = &lpss_device_links[i];
-
- if (acpi_lpss_is_supplier(adev, link))
- acpi_lpss_link_consumer(&pdev->dev, link);
-
- if (acpi_lpss_is_consumer(adev, link))
- acpi_lpss_link_supplier(&pdev->dev, link);
- }
-}
-
-static int acpi_lpss_create_device(struct acpi_device *adev,
- const struct acpi_device_id *id)
-{
- const struct lpss_device_desc *dev_desc;
- struct lpss_private_data *pdata;
- struct resource_entry *rentry;
- struct list_head resource_list;
- struct platform_device *pdev;
- int ret;
-
- dev_desc = (const struct lpss_device_desc *)id->driver_data;
- if (!dev_desc)
- return -EINVAL;
-
- pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
- if (!pdata)
- return -ENOMEM;
-
- INIT_LIST_HEAD(&resource_list);
- ret = acpi_dev_get_memory_resources(adev, &resource_list);
- if (ret < 0)
- goto err_out;
-
- rentry = list_first_entry_or_null(&resource_list, struct resource_entry, node);
- if (rentry) {
- if (dev_desc->prv_size_override)
- pdata->mmio_size = dev_desc->prv_size_override;
- else
- pdata->mmio_size = resource_size(rentry->res);
- pdata->mmio_base = ioremap(rentry->res->start, pdata->mmio_size);
- }
-
- acpi_dev_free_resource_list(&resource_list);
-
- if (!pdata->mmio_base) {
- /* Avoid acpi_bus_attach() instantiating a pdev for this dev. */
- adev->pnp.type.platform_id = 0;
- goto out_free;
- }
-
- pdata->adev = adev;
- pdata->dev_desc = dev_desc;
-
- if (dev_desc->setup)
- dev_desc->setup(pdata);
-
- if (dev_desc->flags & LPSS_CLK) {
- ret = register_device_clock(adev, pdata);
- if (ret)
- goto out_free;
- }
-
- /*
- * This works around a known issue in ACPI tables where LPSS devices
- * have _PS0 and _PS3 without _PSC (and no power resources), so
- * acpi_bus_init_power() will assume that the BIOS has put them into D0.
- */
- acpi_device_fix_up_power(adev);
-
- adev->driver_data = pdata;
- pdev = acpi_create_platform_device(adev, dev_desc->properties);
- if (IS_ERR_OR_NULL(pdev)) {
- adev->driver_data = NULL;
- ret = PTR_ERR(pdev);
- goto err_out;
- }
-
- acpi_lpss_create_device_links(adev, pdev);
- return 1;
-
-out_free:
- /* Skip the device, but continue the namespace scan */
- ret = 0;
-err_out:
- kfree(pdata);
- return ret;
-}
-
-static u32 __lpss_reg_read(struct lpss_private_data *pdata, unsigned int reg)
-{
- return readl(pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
-}
-
-static void __lpss_reg_write(u32 val, struct lpss_private_data *pdata,
- unsigned int reg)
-{
- writel(val, pdata->mmio_base + pdata->dev_desc->prv_offset + reg);
-}
-
-static int lpss_reg_read(struct device *dev, unsigned int reg, u32 *val)
-{
- struct acpi_device *adev = ACPI_COMPANION(dev);
- struct lpss_private_data *pdata;
- unsigned long flags;
- int ret;
-
- if (WARN_ON(!adev))
- return -ENODEV;
-
- spin_lock_irqsave(&dev->power.lock, flags);
- if (pm_runtime_suspended(dev)) {
- ret = -EAGAIN;
- goto out;
- }
- pdata = acpi_driver_data(adev);
- if (WARN_ON(!pdata || !pdata->mmio_base)) {
- ret = -ENODEV;
- goto out;
- }
- *val = __lpss_reg_read(pdata, reg);
- ret = 0;
-
- out:
- spin_unlock_irqrestore(&dev->power.lock, flags);
- return ret;
-}
-
-static ssize_t lpss_ltr_show(struct device *dev, struct device_attribute *attr,
- char *buf)
-{
- u32 ltr_value = 0;
- unsigned int reg;
- int ret;
-
- reg = strcmp(attr->attr.name, "auto_ltr") ? LPSS_SW_LTR : LPSS_AUTO_LTR;
- ret = lpss_reg_read(dev, reg, <r_value);
- if (ret)
- return ret;
-
- return sysfs_emit(buf, "%08x\n", ltr_value);
-}
-
-static ssize_t lpss_ltr_mode_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- u32 ltr_mode = 0;
- char *outstr;
- int ret;
-
- ret = lpss_reg_read(dev, LPSS_GENERAL, <r_mode);
- if (ret)
- return ret;
-
- outstr = (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) ? "sw" : "auto";
- return sprintf(buf, "%s\n", outstr);
-}
-
-static DEVICE_ATTR(auto_ltr, S_IRUSR, lpss_ltr_show, NULL);
-static DEVICE_ATTR(sw_ltr, S_IRUSR, lpss_ltr_show, NULL);
-static DEVICE_ATTR(ltr_mode, S_IRUSR, lpss_ltr_mode_show, NULL);
-
-static struct attribute *lpss_attrs[] = {
- &dev_attr_auto_ltr.attr,
- &dev_attr_sw_ltr.attr,
- &dev_attr_ltr_mode.attr,
- NULL,
-};
-
-static const struct attribute_group lpss_attr_group = {
- .attrs = lpss_attrs,
- .name = "lpss_ltr",
-};
-
-static void acpi_lpss_set_ltr(struct device *dev, s32 val)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
- u32 ltr_mode, ltr_val;
-
- ltr_mode = __lpss_reg_read(pdata, LPSS_GENERAL);
- if (val < 0) {
- if (ltr_mode & LPSS_GENERAL_LTR_MODE_SW) {
- ltr_mode &= ~LPSS_GENERAL_LTR_MODE_SW;
- __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
- }
- return;
- }
- ltr_val = __lpss_reg_read(pdata, LPSS_SW_LTR) & ~LPSS_LTR_SNOOP_MASK;
- if (val >= LPSS_LTR_SNOOP_LAT_CUTOFF) {
- ltr_val |= LPSS_LTR_SNOOP_LAT_32US;
- val = LPSS_LTR_MAX_VAL;
- } else if (val > LPSS_LTR_MAX_VAL) {
- ltr_val |= LPSS_LTR_SNOOP_LAT_32US | LPSS_LTR_SNOOP_REQ;
- val >>= LPSS_LTR_SNOOP_LAT_SHIFT;
- } else {
- ltr_val |= LPSS_LTR_SNOOP_LAT_1US | LPSS_LTR_SNOOP_REQ;
- }
- ltr_val |= val;
- __lpss_reg_write(ltr_val, pdata, LPSS_SW_LTR);
- if (!(ltr_mode & LPSS_GENERAL_LTR_MODE_SW)) {
- ltr_mode |= LPSS_GENERAL_LTR_MODE_SW;
- __lpss_reg_write(ltr_mode, pdata, LPSS_GENERAL);
- }
-}
-
-#ifdef CONFIG_PM
-/**
- * acpi_lpss_save_ctx() - Save the private registers of LPSS device
- * @dev: LPSS device
- * @pdata: pointer to the private data of the LPSS device
- *
- * Most LPSS devices have private registers which may loose their context when
- * the device is powered down. acpi_lpss_save_ctx() saves those registers into
- * prv_reg_ctx array.
- */
-static void acpi_lpss_save_ctx(struct device *dev,
- struct lpss_private_data *pdata)
-{
- unsigned int i;
-
- for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
- unsigned long offset = i * sizeof(u32);
-
- pdata->prv_reg_ctx[i] = __lpss_reg_read(pdata, offset);
- dev_dbg(dev, "saving 0x%08x from LPSS reg at offset 0x%02lx\n",
- pdata->prv_reg_ctx[i], offset);
- }
-}
-
-/**
- * acpi_lpss_restore_ctx() - Restore the private registers of LPSS device
- * @dev: LPSS device
- * @pdata: pointer to the private data of the LPSS device
- *
- * Restores the registers that were previously stored with acpi_lpss_save_ctx().
- */
-static void acpi_lpss_restore_ctx(struct device *dev,
- struct lpss_private_data *pdata)
-{
- unsigned int i;
-
- for (i = 0; i < LPSS_PRV_REG_COUNT; i++) {
- unsigned long offset = i * sizeof(u32);
-
- __lpss_reg_write(pdata->prv_reg_ctx[i], pdata, offset);
- dev_dbg(dev, "restoring 0x%08x to LPSS reg at offset 0x%02lx\n",
- pdata->prv_reg_ctx[i], offset);
- }
-}
-
-static void acpi_lpss_d3_to_d0_delay(struct lpss_private_data *pdata)
-{
- /*
- * The following delay is needed or the subsequent write operations may
- * fail. The LPSS devices are actually PCI devices and the PCI spec
- * expects 10ms delay before the device can be accessed after D3 to D0
- * transition. However some platforms like BSW does not need this delay.
- */
- unsigned int delay = 10; /* default 10ms delay */
-
- if (pdata->dev_desc->flags & LPSS_NO_D3_DELAY)
- delay = 0;
-
- msleep(delay);
-}
-
-static int acpi_lpss_activate(struct device *dev)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
- int ret;
-
- ret = acpi_dev_resume(dev);
- if (ret)
- return ret;
-
- acpi_lpss_d3_to_d0_delay(pdata);
-
- /*
- * This is called only on ->probe() stage where a device is either in
- * known state defined by BIOS or most likely powered off. Due to this
- * we have to deassert reset line to be sure that ->probe() will
- * recognize the device.
- */
- if (pdata->dev_desc->flags & (LPSS_SAVE_CTX | LPSS_SAVE_CTX_ONCE))
- lpss_deassert_reset(pdata);
-
-#ifdef CONFIG_PM
- if (pdata->dev_desc->flags & LPSS_SAVE_CTX_ONCE)
- acpi_lpss_save_ctx(dev, pdata);
-#endif
-
- return 0;
-}
-
-static void acpi_lpss_dismiss(struct device *dev)
-{
- acpi_dev_suspend(dev, false);
-}
-
-/* IOSF SB for LPSS island */
-#define LPSS_IOSF_UNIT_LPIOEP 0xA0
-#define LPSS_IOSF_UNIT_LPIO1 0xAB
-#define LPSS_IOSF_UNIT_LPIO2 0xAC
-
-#define LPSS_IOSF_PMCSR 0x84
-#define LPSS_PMCSR_D0 0
-#define LPSS_PMCSR_D3hot 3
-#define LPSS_PMCSR_Dx_MASK GENMASK(1, 0)
-
-#define LPSS_IOSF_GPIODEF0 0x154
-#define LPSS_GPIODEF0_DMA1_D3 BIT(2)
-#define LPSS_GPIODEF0_DMA2_D3 BIT(3)
-#define LPSS_GPIODEF0_DMA_D3_MASK GENMASK(3, 2)
-#define LPSS_GPIODEF0_DMA_LLP BIT(13)
-
-static DEFINE_MUTEX(lpss_iosf_mutex);
-static bool lpss_iosf_d3_entered = true;
-
-static void lpss_iosf_enter_d3_state(void)
-{
- u32 value1 = 0;
- u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK | LPSS_GPIODEF0_DMA_LLP;
- u32 value2 = LPSS_PMCSR_D3hot;
- u32 mask2 = LPSS_PMCSR_Dx_MASK;
- /*
- * PMC provides an information about actual status of the LPSS devices.
- * Here we read the values related to LPSS power island, i.e. LPSS
- * devices, excluding both LPSS DMA controllers, along with SCC domain.
- */
- u32 func_dis, d3_sts_0, pmc_status;
- int ret;
-
- ret = pmc_atom_read(PMC_FUNC_DIS, &func_dis);
- if (ret)
- return;
-
- mutex_lock(&lpss_iosf_mutex);
-
- ret = pmc_atom_read(PMC_D3_STS_0, &d3_sts_0);
- if (ret)
- goto exit;
-
- /*
- * Get the status of entire LPSS power island per device basis.
- * Shutdown both LPSS DMA controllers if and only if all other devices
- * are already in D3hot.
- */
- pmc_status = (~(d3_sts_0 | func_dis)) & pmc_atom_d3_mask;
- if (pmc_status)
- goto exit;
-
- iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE,
- LPSS_IOSF_PMCSR, value2, mask2);
-
- iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2, MBI_CFG_WRITE,
- LPSS_IOSF_PMCSR, value2, mask2);
-
- iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE,
- LPSS_IOSF_GPIODEF0, value1, mask1);
-
- lpss_iosf_d3_entered = true;
-
-exit:
- mutex_unlock(&lpss_iosf_mutex);
-}
-
-static void lpss_iosf_exit_d3_state(void)
-{
- u32 value1 = LPSS_GPIODEF0_DMA1_D3 | LPSS_GPIODEF0_DMA2_D3 |
- LPSS_GPIODEF0_DMA_LLP;
- u32 mask1 = LPSS_GPIODEF0_DMA_D3_MASK | LPSS_GPIODEF0_DMA_LLP;
- u32 value2 = LPSS_PMCSR_D0;
- u32 mask2 = LPSS_PMCSR_Dx_MASK;
-
- mutex_lock(&lpss_iosf_mutex);
-
- if (!lpss_iosf_d3_entered)
- goto exit;
-
- lpss_iosf_d3_entered = false;
-
- iosf_mbi_modify(LPSS_IOSF_UNIT_LPIOEP, MBI_CR_WRITE,
- LPSS_IOSF_GPIODEF0, value1, mask1);
-
- iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO2, MBI_CFG_WRITE,
- LPSS_IOSF_PMCSR, value2, mask2);
-
- iosf_mbi_modify(LPSS_IOSF_UNIT_LPIO1, MBI_CFG_WRITE,
- LPSS_IOSF_PMCSR, value2, mask2);
-
-exit:
- mutex_unlock(&lpss_iosf_mutex);
-}
-
-static int acpi_lpss_suspend(struct device *dev, bool wakeup)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
- int ret;
-
- if (pdata->dev_desc->flags & LPSS_SAVE_CTX)
- acpi_lpss_save_ctx(dev, pdata);
-
- ret = acpi_dev_suspend(dev, wakeup);
-
- /*
- * This call must be last in the sequence, otherwise PMC will return
- * wrong status for devices being about to be powered off. See
- * lpss_iosf_enter_d3_state() for further information.
- */
- if (acpi_target_system_state() == ACPI_STATE_S0 &&
- lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
- lpss_iosf_enter_d3_state();
-
- return ret;
-}
-
-static int acpi_lpss_resume(struct device *dev)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
- int ret;
-
- /*
- * This call is kept first to be in symmetry with
- * acpi_lpss_runtime_suspend() one.
- */
- if (lpss_quirks & LPSS_QUIRK_ALWAYS_POWER_ON && iosf_mbi_available())
- lpss_iosf_exit_d3_state();
-
- ret = acpi_dev_resume(dev);
- if (ret)
- return ret;
-
- acpi_lpss_d3_to_d0_delay(pdata);
-
- if (pdata->dev_desc->flags & (LPSS_SAVE_CTX | LPSS_SAVE_CTX_ONCE))
- acpi_lpss_restore_ctx(dev, pdata);
-
- return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int acpi_lpss_do_suspend_late(struct device *dev)
-{
- int ret;
-
- if (dev_pm_skip_suspend(dev))
- return 0;
-
- ret = pm_generic_suspend_late(dev);
- return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev));
-}
-
-static int acpi_lpss_suspend_late(struct device *dev)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
-
- if (pdata->dev_desc->resume_from_noirq)
- return 0;
-
- return acpi_lpss_do_suspend_late(dev);
-}
-
-static int acpi_lpss_suspend_noirq(struct device *dev)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
- int ret;
-
- if (pdata->dev_desc->resume_from_noirq) {
- /*
- * The driver's ->suspend_late callback will be invoked by
- * acpi_lpss_do_suspend_late(), with the assumption that the
- * driver really wanted to run that code in ->suspend_noirq, but
- * it could not run after acpi_dev_suspend() and the driver
- * expected the latter to be called in the "late" phase.
- */
- ret = acpi_lpss_do_suspend_late(dev);
- if (ret)
- return ret;
- }
-
- return acpi_subsys_suspend_noirq(dev);
-}
-
-static int acpi_lpss_do_resume_early(struct device *dev)
-{
- int ret = acpi_lpss_resume(dev);
-
- return ret ? ret : pm_generic_resume_early(dev);
-}
-
-static int acpi_lpss_resume_early(struct device *dev)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
-
- if (pdata->dev_desc->resume_from_noirq)
- return 0;
-
- if (dev_pm_skip_resume(dev))
- return 0;
-
- return acpi_lpss_do_resume_early(dev);
-}
-
-static int acpi_lpss_resume_noirq(struct device *dev)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
- int ret;
-
- /* Follow acpi_subsys_resume_noirq(). */
- if (dev_pm_skip_resume(dev))
- return 0;
-
- ret = pm_generic_resume_noirq(dev);
- if (ret)
- return ret;
-
- if (!pdata->dev_desc->resume_from_noirq)
- return 0;
-
- /*
- * The driver's ->resume_early callback will be invoked by
- * acpi_lpss_do_resume_early(), with the assumption that the driver
- * really wanted to run that code in ->resume_noirq, but it could not
- * run before acpi_dev_resume() and the driver expected the latter to be
- * called in the "early" phase.
- */
- return acpi_lpss_do_resume_early(dev);
-}
-
-static int acpi_lpss_do_restore_early(struct device *dev)
-{
- int ret = acpi_lpss_resume(dev);
-
- return ret ? ret : pm_generic_restore_early(dev);
-}
-
-static int acpi_lpss_restore_early(struct device *dev)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
-
- if (pdata->dev_desc->resume_from_noirq)
- return 0;
-
- return acpi_lpss_do_restore_early(dev);
-}
-
-static int acpi_lpss_restore_noirq(struct device *dev)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
- int ret;
-
- ret = pm_generic_restore_noirq(dev);
- if (ret)
- return ret;
-
- if (!pdata->dev_desc->resume_from_noirq)
- return 0;
-
- /* This is analogous to what happens in acpi_lpss_resume_noirq(). */
- return acpi_lpss_do_restore_early(dev);
-}
-
-static int acpi_lpss_do_poweroff_late(struct device *dev)
-{
- int ret = pm_generic_poweroff_late(dev);
-
- return ret ? ret : acpi_lpss_suspend(dev, device_may_wakeup(dev));
-}
-
-static int acpi_lpss_poweroff_late(struct device *dev)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
-
- if (dev_pm_skip_suspend(dev))
- return 0;
-
- if (pdata->dev_desc->resume_from_noirq)
- return 0;
-
- return acpi_lpss_do_poweroff_late(dev);
-}
-
-static int acpi_lpss_poweroff_noirq(struct device *dev)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
-
- if (dev_pm_skip_suspend(dev))
- return 0;
-
- if (pdata->dev_desc->resume_from_noirq) {
- /* This is analogous to the acpi_lpss_suspend_noirq() case. */
- int ret = acpi_lpss_do_poweroff_late(dev);
-
- if (ret)
- return ret;
- }
-
- return pm_generic_poweroff_noirq(dev);
-}
-#endif /* CONFIG_PM_SLEEP */
-
-static int acpi_lpss_runtime_suspend(struct device *dev)
-{
- int ret = pm_generic_runtime_suspend(dev);
-
- return ret ? ret : acpi_lpss_suspend(dev, true);
-}
-
-static int acpi_lpss_runtime_resume(struct device *dev)
-{
- int ret = acpi_lpss_resume(dev);
-
- return ret ? ret : pm_generic_runtime_resume(dev);
-}
-#endif /* CONFIG_PM */
-
-static struct dev_pm_domain acpi_lpss_pm_domain = {
-#ifdef CONFIG_PM
- .activate = acpi_lpss_activate,
- .dismiss = acpi_lpss_dismiss,
-#endif
- .ops = {
-#ifdef CONFIG_PM
-#ifdef CONFIG_PM_SLEEP
- .prepare = acpi_subsys_prepare,
- .complete = acpi_subsys_complete,
- .suspend = acpi_subsys_suspend,
- .suspend_late = acpi_lpss_suspend_late,
- .suspend_noirq = acpi_lpss_suspend_noirq,
- .resume_noirq = acpi_lpss_resume_noirq,
- .resume_early = acpi_lpss_resume_early,
- .freeze = acpi_subsys_freeze,
- .poweroff = acpi_subsys_poweroff,
- .poweroff_late = acpi_lpss_poweroff_late,
- .poweroff_noirq = acpi_lpss_poweroff_noirq,
- .restore_noirq = acpi_lpss_restore_noirq,
- .restore_early = acpi_lpss_restore_early,
-#endif
- .runtime_suspend = acpi_lpss_runtime_suspend,
- .runtime_resume = acpi_lpss_runtime_resume,
-#endif
- },
-};
-
-static int acpi_lpss_platform_notify(struct notifier_block *nb,
- unsigned long action, void *data)
-{
- struct platform_device *pdev = to_platform_device(data);
- struct lpss_private_data *pdata;
- struct acpi_device *adev;
- const struct acpi_device_id *id;
-
- id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev);
- if (!id || !id->driver_data)
- return 0;
-
- adev = ACPI_COMPANION(&pdev->dev);
- if (!adev)
- return 0;
-
- pdata = acpi_driver_data(adev);
- if (!pdata)
- return 0;
-
- if (pdata->mmio_base &&
- pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) {
- dev_err(&pdev->dev, "MMIO size insufficient to access LTR\n");
- return 0;
- }
-
- switch (action) {
- case BUS_NOTIFY_BIND_DRIVER:
- dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);
- break;
- case BUS_NOTIFY_DRIVER_NOT_BOUND:
- case BUS_NOTIFY_UNBOUND_DRIVER:
- dev_pm_domain_set(&pdev->dev, NULL);
- break;
- case BUS_NOTIFY_ADD_DEVICE:
- dev_pm_domain_set(&pdev->dev, &acpi_lpss_pm_domain);
- if (pdata->dev_desc->flags & LPSS_LTR)
- return sysfs_create_group(&pdev->dev.kobj,
- &lpss_attr_group);
- break;
- case BUS_NOTIFY_DEL_DEVICE:
- if (pdata->dev_desc->flags & LPSS_LTR)
- sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group);
- dev_pm_domain_set(&pdev->dev, NULL);
- break;
- default:
- break;
- }
-
- return 0;
-}
-
-static struct notifier_block acpi_lpss_nb = {
- .notifier_call = acpi_lpss_platform_notify,
-};
-
-static void acpi_lpss_bind(struct device *dev)
-{
- struct lpss_private_data *pdata = acpi_driver_data(ACPI_COMPANION(dev));
-
- if (!pdata || !pdata->mmio_base || !(pdata->dev_desc->flags & LPSS_LTR))
- return;
-
- if (pdata->mmio_size >= pdata->dev_desc->prv_offset + LPSS_LTR_SIZE)
- dev->power.set_latency_tolerance = acpi_lpss_set_ltr;
- else
- dev_err(dev, "MMIO size insufficient to access LTR\n");
-}
-
-static void acpi_lpss_unbind(struct device *dev)
-{
- dev->power.set_latency_tolerance = NULL;
-}
-
-static struct acpi_scan_handler lpss_handler = {
- .ids = acpi_lpss_device_ids,
- .attach = acpi_lpss_create_device,
- .bind = acpi_lpss_bind,
- .unbind = acpi_lpss_unbind,
-};
-
-void __init acpi_lpss_init(void)
-{
- const struct x86_cpu_id *id;
- int ret;
-
- ret = lpss_atom_clk_init();
- if (ret)
- return;
-
- id = x86_match_cpu(lpss_cpu_ids);
- if (id)
- lpss_quirks |= LPSS_QUIRK_ALWAYS_POWER_ON;
-
- bus_register_notifier(&platform_bus_type, &acpi_lpss_nb);
- acpi_scan_add_handler(&lpss_handler);
-}
-
-#else
-
-static struct acpi_scan_handler lpss_handler = {
- .ids = acpi_lpss_device_ids,
-};
-
-void __init acpi_lpss_init(void)
-{
- acpi_scan_add_handler(&lpss_handler);
-}
-
-#endif /* CONFIG_X86_INTEL_LPSS */
projects / linux-2.6-block.git / blobdiff