diff options
Diffstat (limited to 'drivers/acpi/acpi_lpss.c')
| -rw-r--r-- | drivers/acpi/acpi_lpss.c | 1378 |
1 files changed, 1378 insertions, 0 deletions
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c new file mode 100644 index 000000000..8b4474394 --- /dev/null +++ b/drivers/acpi/acpi_lpss.c @@ -0,0 +1,1378 @@ +// 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) +{ + u64 uid; + + /* Only call pwm_add_table for the first PWM controller */ + if (acpi_dev_uid_to_integer(pdata->adev, &uid) || uid != 1) + return; + + 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 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_soc_backlight", 0, PWM_POLARITY_NORMAL, + "pwm-lpss-platform"), +}; + +static void bsw_pwm_setup(struct lpss_private_data *pdata) +{ + u64 uid; + + /* Only call pwm_add_table for the first PWM controller */ + if (acpi_dev_uid_to_integer(pdata->adev, &uid) || uid != 1) + return; + + 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 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) }, + { "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_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) }, + { "INT3437", }, + + /* 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 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 ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids)) + || 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 ((link->dep_missing_ids && dmi_check_system(link->dep_missing_ids)) + || 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_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 */ |