diff options
Diffstat (limited to 'drivers/acpi/acpi_lpss.c')
| -rw-r--r-- | drivers/acpi/acpi_lpss.c | 1263 |
1 files changed, 0 insertions, 1263 deletions
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c deleted file mode 100644 index 5f94c35d165f..000000000000 --- a/drivers/acpi/acpi_lpss.c +++ /dev/null @@ -1,1263 +0,0 @@ -/* - * 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> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -#include <linux/acpi.h> -#include <linux/clkdev.h> -#include <linux/clk-provider.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/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/suspend.h> -#include <linux/delay.h> - -#include "internal.h" - -ACPI_MODULE_NAME("acpi_lpss"); - -#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) -#define LPSS_NO_D3_DELAY BIT(5) - -/* Crystal Cove PMIC shares same ACPI ID between different platforms */ -#define BYT_CRC_HRV 2 -#define CHT_CRC_HRV 3 - -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; - 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_backlight", 0, PWM_POLARITY_NORMAL, - "pwm-lpss-platform"), -}; - -static void byt_pwm_setup(struct lpss_private_data *pdata) -{ - struct acpi_device *adev = pdata->adev; - - /* Only call pwm_add_table for the first PWM controller */ - if (!adev->pnp.unique_id || strcmp(adev->pnp.unique_id, "1")) - return; - - if (!acpi_dev_present("INT33FD", NULL, BYT_CRC_HRV)) - 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) -{ - const char *uid_str = acpi_device_uid(pdata->adev); - acpi_handle handle = pdata->adev->handle; - unsigned long long shared_host = 0; - acpi_status status; - long uid = 0; - - /* Expected to always be true, but better safe then sorry */ - if (uid_str) - uid = simple_strtol(uid_str, NULL, 10); - - /* 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 && uid) - 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 PWM used for backlight control by the i915 driver */ -static struct pwm_lookup bsw_pwm_lookup[] = { - PWM_LOOKUP_WITH_MODULE("80862288:00", 0, "0000:00:02.0", - "pwm_backlight", 0, PWM_POLARITY_NORMAL, - "pwm-lpss-platform"), -}; - -static void bsw_pwm_setup(struct lpss_private_data *pdata) -{ - struct acpi_device *adev = pdata->adev; - - /* Only call pwm_add_table for the first PWM controller */ - if (!adev->pnp.unique_id || strcmp(adev->pnp.unique_id, "1")) - return; - - pwm_add_table(bsw_pwm_lookup, ARRAY_SIZE(bsw_pwm_lookup)); -} - -static const struct lpss_device_desc lpt_dev_desc = { - .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_LTR, - .prv_offset = 0x800, -}; - -static const struct lpss_device_desc lpt_i2c_dev_desc = { - .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_LTR, - .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, - .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 | LPSS_NO_D3_DELAY, - .prv_offset = 0x800, - .setup = bsw_pwm_setup, -}; - -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 lpss_device_desc byt_spi_dev_desc = { - .flags = LPSS_CLK | LPSS_CLK_GATE | LPSS_CLK_DIVIDER | LPSS_SAVE_CTX, - .prv_offset = 0x400, -}; - -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 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, -}; - -#define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, } - -static const struct x86_cpu_id lpss_cpu_ids[] = { - ICPU(INTEL_FAM6_ATOM_SILVERMONT), /* Valleyview, Bay Trail */ - ICPU(INTEL_FAM6_ATOM_AIRMONT), /* Braswell, Cherry Trail */ - {} -}; - -#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_dev_desc) }, - { "INT33C1", LPSS_ADDR(lpt_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) }, - { "INT33C7", }, - - /* 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) }, - { "INT33B2", }, - { "INT33FC", }, - - /* Braswell LPSS devices */ - { "80862286", LPSS_ADDR(lpss_dma_desc) }, - { "80862288", LPSS_ADDR(bsw_pwm_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_dev_desc) }, - { "INT3431", LPSS_ADDR(lpt_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) }, - { "INT3437", }, - - /* Wildcat Point LPSS devices */ - { "INT3438", LPSS_ADDR(lpt_dev_desc) }, - - { } -}; - -#ifdef CONFIG_X86_INTEL_LPSS - -static int is_memory(struct acpi_resource *res, void *not_used) -{ - struct resource r; - return !acpi_dev_resource_memory(res, &r); -} - -/* 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-lpt", -1, 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(); - - 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, 0, 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; -}; - -/* - * 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[] = { - {"808622C1", "7", "80860F14", "3", DL_FLAG_PM_RUNTIME}, - {"808622C1", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME}, - {"80860F41", "5", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME}, -}; - -static bool hid_uid_match(struct acpi_device *adev, - const char *hid2, const char *uid2) -{ - const char *hid1 = acpi_device_hid(adev); - const char *uid1 = acpi_device_uid(adev); - - if (strcmp(hid1, hid2)) - return false; - - if (!uid2) - return true; - - return uid1 && !strcmp(uid1, uid2); -} - -static bool acpi_lpss_is_supplier(struct acpi_device *adev, - const struct lpss_device_links *link) -{ - return 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 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, void *data) -{ - struct acpi_device *adev = ACPI_COMPANION(dev); - struct hid_uid *id = data; - - if (!adev) - return 0; - - return 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 bool acpi_lpss_dep(struct acpi_device *adev, acpi_handle handle) -{ - struct acpi_handle_list dep_devices; - acpi_status status; - int i; - - if (!acpi_has_method(adev->handle, "_DEP")) - return false; - - status = acpi_evaluate_reference(adev->handle, "_DEP", NULL, - &dep_devices); - if (ACPI_FAILURE(status)) { - dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n"); - return false; - } - - for (i = 0; i < dep_devices.count; i++) { - if (dep_devices.handles[i] == handle) - return true; - } - - return false; -} - -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 (acpi_lpss_dep(ACPI_COMPANION(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 (acpi_lpss_dep(ACPI_COMPANION(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) { - pdev = acpi_create_platform_device(adev, NULL); - return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1; - } - pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); - if (!pdata) - return -ENOMEM; - - INIT_LIST_HEAD(&resource_list); - ret = acpi_dev_get_resources(adev, &resource_list, is_memory, NULL); - if (ret < 0) - goto err_out; - - list_for_each_entry(rentry, &resource_list, node) - if (resource_type(rentry->res) == IORESOURCE_MEM) { - 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); - break; - } - - 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; - /* Skip the device, but continue the namespace scan. */ - ret = 0; - goto err_out; - } - - 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) { - /* Skip the device, but continue the namespace scan. */ - ret = 0; - goto err_out; - } - } - - /* - * 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)) { - acpi_lpss_create_device_links(adev, pdev); - return 1; - } - - ret = PTR_ERR(pdev); - adev->driver_data = NULL; - - 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; - struct lpss_private_data *pdata; - unsigned long flags; - int ret; - - ret = acpi_bus_get_device(ACPI_HANDLE(dev), &adev); - if (WARN_ON(ret)) - return ret; - - 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); - - 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 snprintf(buf, PAGE_SIZE, "%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_deassert_reset(pdata); - - 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) - 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_smart_suspend_and_suspended(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) { - 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; - - 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; - - ret = acpi_subsys_resume_noirq(dev); - if (ret) - return ret; - - if (!dev_pm_may_skip_resume(dev) && pdata->dev_desc->resume_from_noirq) - ret = acpi_lpss_do_resume_early(dev); - - return ret; -} - -#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, - .freeze_late = acpi_subsys_freeze_late, - .freeze_noirq = acpi_subsys_freeze_noirq, - .thaw_noirq = acpi_subsys_thaw_noirq, - .poweroff = acpi_subsys_suspend, - .poweroff_late = acpi_lpss_suspend_late, - .poweroff_noirq = acpi_subsys_suspend_noirq, - .restore_noirq = acpi_subsys_resume_noirq, - .restore_early = acpi_lpss_resume_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; - - if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &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 = lpt_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 */ |