diff options
Diffstat (limited to 'drivers/acpi/acpi_lpss.c')
-rw-r--r-- | drivers/acpi/acpi_lpss.c | 306 |
1 files changed, 254 insertions, 52 deletions
diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index 69e29f4..51069b2 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -19,15 +19,21 @@ #include <linux/platform_device.h> #include <linux/platform_data/clk-lpss.h> #include <linux/pm_runtime.h> +#include <linux/delay.h> #include "internal.h" ACPI_MODULE_NAME("acpi_lpss"); +#ifdef CONFIG_X86_INTEL_LPSS + +#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_GENERAL 0x08 #define LPSS_GENERAL_LTR_MODE_SW BIT(2) #define LPSS_GENERAL_UART_RTS_OVRD BIT(3) @@ -43,6 +49,8 @@ ACPI_MODULE_NAME("acpi_lpss"); #define LPSS_TX_INT 0x20 #define LPSS_TX_INT_MASK BIT(1) +#define LPSS_PRV_REG_COUNT 9 + struct lpss_shared_clock { const char *name; unsigned long rate; @@ -57,7 +65,9 @@ struct lpss_device_desc { bool ltr_required; unsigned int prv_offset; size_t prv_size_override; + bool clk_divider; bool clk_gate; + bool save_ctx; struct lpss_shared_clock *shared_clock; void (*setup)(struct lpss_private_data *pdata); }; @@ -72,6 +82,7 @@ struct lpss_private_data { resource_size_t mmio_size; struct clk *clk; const struct lpss_device_desc *dev_desc; + u32 prv_reg_ctx[LPSS_PRV_REG_COUNT]; }; static void lpss_uart_setup(struct lpss_private_data *pdata) @@ -92,6 +103,14 @@ static struct lpss_device_desc lpt_dev_desc = { .clk_required = true, .prv_offset = 0x800, .ltr_required = true, + .clk_divider = true, + .clk_gate = true, +}; + +static struct lpss_device_desc lpt_i2c_dev_desc = { + .clk_required = true, + .prv_offset = 0x800, + .ltr_required = true, .clk_gate = true, }; @@ -99,6 +118,7 @@ static struct lpss_device_desc lpt_uart_dev_desc = { .clk_required = true, .prv_offset = 0x800, .ltr_required = true, + .clk_divider = true, .clk_gate = true, .setup = lpss_uart_setup, }; @@ -116,32 +136,25 @@ static struct lpss_shared_clock pwm_clock = { static struct lpss_device_desc byt_pwm_dev_desc = { .clk_required = true, + .save_ctx = true, .shared_clock = &pwm_clock, }; -static struct lpss_shared_clock uart_clock = { - .name = "uart_clk", - .rate = 44236800, -}; - static struct lpss_device_desc byt_uart_dev_desc = { .clk_required = true, .prv_offset = 0x800, + .clk_divider = true, .clk_gate = true, - .shared_clock = &uart_clock, + .save_ctx = true, .setup = lpss_uart_setup, }; -static struct lpss_shared_clock spi_clock = { - .name = "spi_clk", - .rate = 50000000, -}; - static struct lpss_device_desc byt_spi_dev_desc = { .clk_required = true, .prv_offset = 0x400, + .clk_divider = true, .clk_gate = true, - .shared_clock = &spi_clock, + .save_ctx = true, }; static struct lpss_device_desc byt_sdio_dev_desc = { @@ -156,43 +169,52 @@ static struct lpss_shared_clock i2c_clock = { static struct lpss_device_desc byt_i2c_dev_desc = { .clk_required = true, .prv_offset = 0x800, + .save_ctx = true, .shared_clock = &i2c_clock, }; +#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", (unsigned long)&lpss_dma_desc }, + { "INTL9C60", LPSS_ADDR(lpss_dma_desc) }, /* Lynxpoint LPSS devices */ - { "INT33C0", (unsigned long)&lpt_dev_desc }, - { "INT33C1", (unsigned long)&lpt_dev_desc }, - { "INT33C2", (unsigned long)&lpt_dev_desc }, - { "INT33C3", (unsigned long)&lpt_dev_desc }, - { "INT33C4", (unsigned long)&lpt_uart_dev_desc }, - { "INT33C5", (unsigned long)&lpt_uart_dev_desc }, - { "INT33C6", (unsigned long)&lpt_sdio_dev_desc }, + { "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", (unsigned long)&byt_pwm_dev_desc }, - { "80860F0A", (unsigned long)&byt_uart_dev_desc }, - { "80860F0E", (unsigned long)&byt_spi_dev_desc }, - { "80860F14", (unsigned long)&byt_sdio_dev_desc }, - { "80860F41", (unsigned long)&byt_i2c_dev_desc }, + { "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", }, - { "INT3430", (unsigned long)&lpt_dev_desc }, - { "INT3431", (unsigned long)&lpt_dev_desc }, - { "INT3432", (unsigned long)&lpt_dev_desc }, - { "INT3433", (unsigned long)&lpt_dev_desc }, - { "INT3434", (unsigned long)&lpt_uart_dev_desc }, - { "INT3435", (unsigned long)&lpt_uart_dev_desc }, - { "INT3436", (unsigned long)&lpt_sdio_dev_desc }, + { "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", }, { } }; +#ifdef CONFIG_X86_INTEL_LPSS + static int is_memory(struct acpi_resource *res, void *not_used) { struct resource r; @@ -212,9 +234,11 @@ static int register_device_clock(struct acpi_device *adev, { const struct lpss_device_desc *dev_desc = pdata->dev_desc; struct lpss_shared_clock *shared_clock = dev_desc->shared_clock; + const char *devname = dev_name(&adev->dev); struct clk *clk = ERR_PTR(-ENODEV); struct lpss_clk_data *clk_data; - const char *parent; + const char *parent, *clk_name; + void __iomem *prv_base; if (!lpss_clk_dev) lpt_register_clock_device(); @@ -225,7 +249,7 @@ static int register_device_clock(struct acpi_device *adev, if (dev_desc->clkdev_name) { clk_register_clkdev(clk_data->clk, dev_desc->clkdev_name, - dev_name(&adev->dev)); + devname); return 0; } @@ -234,6 +258,7 @@ static int register_device_clock(struct acpi_device *adev, return -ENODATA; parent = clk_data->name; + prv_base = pdata->mmio_base + dev_desc->prv_offset; if (shared_clock) { clk = shared_clock->clk; @@ -247,16 +272,41 @@ static int register_device_clock(struct acpi_device *adev, } if (dev_desc->clk_gate) { - clk = clk_register_gate(NULL, dev_name(&adev->dev), parent, 0, - pdata->mmio_base + dev_desc->prv_offset, - 0, 0, NULL); - pdata->clk = clk; + clk = clk_register_gate(NULL, devname, parent, 0, + prv_base, 0, 0, NULL); + parent = devname; + } + + if (dev_desc->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); } if (IS_ERR(clk)) return PTR_ERR(clk); - clk_register_clkdev(clk, NULL, dev_name(&adev->dev)); + pdata->clk = clk; + clk_register_clkdev(clk, NULL, devname); return 0; } @@ -267,12 +317,14 @@ static int acpi_lpss_create_device(struct acpi_device *adev, struct lpss_private_data *pdata; struct resource_list_entry *rentry; struct list_head resource_list; + struct platform_device *pdev; int ret; dev_desc = (struct lpss_device_desc *)id->driver_data; - if (!dev_desc) - return acpi_create_platform_device(adev, id); - + if (!dev_desc) { + pdev = acpi_create_platform_device(adev); + return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1; + } pdata = kzalloc(sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM; @@ -322,10 +374,13 @@ static int acpi_lpss_create_device(struct acpi_device *adev, dev_desc->setup(pdata); adev->driver_data = pdata; - ret = acpi_create_platform_device(adev, id); - if (ret > 0) - return ret; + pdev = acpi_create_platform_device(adev); + if (!IS_ERR_OR_NULL(pdev)) { + device_enable_async_suspend(&pdev->dev); + return 1; + } + ret = PTR_ERR(pdev); adev->driver_data = NULL; err_out: @@ -449,6 +504,126 @@ static void acpi_lpss_set_ltr(struct device *dev, s32 val) } } +#ifdef CONFIG_PM +/** + * acpi_lpss_save_ctx() - Save the private registers of LPSS device + * @dev: 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 = acpi_driver_data(ACPI_COMPANION(dev)); + 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 + * + * 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 = acpi_driver_data(ACPI_COMPANION(dev)); + unsigned int i; + + /* + * 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. + */ + msleep(10); + + 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); + } +} + +#ifdef CONFIG_PM_SLEEP +static int acpi_lpss_suspend_late(struct device *dev) +{ + int ret = pm_generic_suspend_late(dev); + + if (ret) + return ret; + + acpi_lpss_save_ctx(dev); + return acpi_dev_suspend_late(dev); +} + +static int acpi_lpss_restore_early(struct device *dev) +{ + int ret = acpi_dev_resume_early(dev); + + if (ret) + return ret; + + acpi_lpss_restore_ctx(dev); + return pm_generic_resume_early(dev); +} +#endif /* CONFIG_PM_SLEEP */ + +#ifdef CONFIG_PM_RUNTIME +static int acpi_lpss_runtime_suspend(struct device *dev) +{ + int ret = pm_generic_runtime_suspend(dev); + + if (ret) + return ret; + + acpi_lpss_save_ctx(dev); + return acpi_dev_runtime_suspend(dev); +} + +static int acpi_lpss_runtime_resume(struct device *dev) +{ + int ret = acpi_dev_runtime_resume(dev); + + if (ret) + return ret; + + acpi_lpss_restore_ctx(dev); + return pm_generic_runtime_resume(dev); +} +#endif /* CONFIG_PM_RUNTIME */ +#endif /* CONFIG_PM */ + +static struct dev_pm_domain acpi_lpss_pm_domain = { + .ops = { +#ifdef CONFIG_PM_SLEEP + .suspend_late = acpi_lpss_suspend_late, + .restore_early = acpi_lpss_restore_early, + .prepare = acpi_subsys_prepare, + .complete = acpi_subsys_complete, + .suspend = acpi_subsys_suspend, + .resume_early = acpi_subsys_resume_early, + .freeze = acpi_subsys_freeze, + .poweroff = acpi_subsys_suspend, + .poweroff_late = acpi_subsys_suspend_late, +#endif +#ifdef CONFIG_PM_RUNTIME + .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) { @@ -456,7 +631,6 @@ static int acpi_lpss_platform_notify(struct notifier_block *nb, struct lpss_private_data *pdata; struct acpi_device *adev; const struct acpi_device_id *id; - int ret = 0; id = acpi_match_device(acpi_lpss_device_ids, &pdev->dev); if (!id || !id->driver_data) @@ -466,7 +640,7 @@ static int acpi_lpss_platform_notify(struct notifier_block *nb, return 0; pdata = acpi_driver_data(adev); - if (!pdata || !pdata->mmio_base || !pdata->dev_desc->ltr_required) + if (!pdata || !pdata->mmio_base) return 0; if (pdata->mmio_size < pdata->dev_desc->prv_offset + LPSS_LTR_SIZE) { @@ -474,12 +648,27 @@ static int acpi_lpss_platform_notify(struct notifier_block *nb, return 0; } - if (action == BUS_NOTIFY_ADD_DEVICE) - ret = sysfs_create_group(&pdev->dev.kobj, &lpss_attr_group); - else if (action == BUS_NOTIFY_DEL_DEVICE) - sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group); + switch (action) { + case BUS_NOTIFY_BOUND_DRIVER: + if (pdata->dev_desc->save_ctx) + pdev->dev.pm_domain = &acpi_lpss_pm_domain; + break; + case BUS_NOTIFY_UNBOUND_DRIVER: + if (pdata->dev_desc->save_ctx) + pdev->dev.pm_domain = NULL; + break; + case BUS_NOTIFY_ADD_DEVICE: + if (pdata->dev_desc->ltr_required) + return sysfs_create_group(&pdev->dev.kobj, + &lpss_attr_group); + case BUS_NOTIFY_DEL_DEVICE: + if (pdata->dev_desc->ltr_required) + sysfs_remove_group(&pdev->dev.kobj, &lpss_attr_group); + default: + break; + } - return ret; + return 0; } static struct notifier_block acpi_lpss_nb = { @@ -518,3 +707,16 @@ void __init acpi_lpss_init(void) 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 */ |