From 60a3437dc9a61c7f4b199c2bac3dcc7b611b1178 Mon Sep 17 00:00:00 2001 From: Tarun Kanti DebBarma Date: Thu, 29 Sep 2011 04:47:25 +0530 Subject: [PATCH] gpio/omap: handle save/restore context in GPIO driver Modify omap_gpio_prepare_for_idle() & omap_gpio_resume_after_idle() functions to handle save context & restore context respectively in the OMAP GPIO driver itself instead of calling these functions from pm specific files. For this, in gpio_prepare_for_idle(), call *_get_context_loss_count() and in gpio_resume_after_idle() call it again. If the count is different, do restore context. Signed-off-by: Charulatha V Signed-off-by: Tarun Kanti DebBarma Reviewed-by: Santosh Shilimkar Acked-by: Tony Lindgren Reviewed-by: Kevin Hilman Signed-off-by: Kevin Hilman --- arch/arm/mach-omap2/gpio.c | 3 +- arch/arm/mach-omap2/pm34xx.c | 14 --- arch/arm/plat-omap/include/plat/gpio.h | 5 +- drivers/gpio/gpio-omap.c | 131 +++++++++++-------------- 4 files changed, 63 insertions(+), 90 deletions(-) diff --git a/arch/arm/mach-omap2/gpio.c b/arch/arm/mach-omap2/gpio.c index 076be342ad28..f84db8ff207f 100644 --- a/arch/arm/mach-omap2/gpio.c +++ b/arch/arm/mach-omap2/gpio.c @@ -23,6 +23,7 @@ #include #include +#include #include "powerdomain.h" @@ -55,7 +56,7 @@ static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused) pdata->bank_width = dev_attr->bank_width; pdata->dbck_flag = dev_attr->dbck_flag; pdata->virtual_irq_start = IH_GPIO_BASE + 32 * (id - 1); - + pdata->get_context_loss_count = omap_pm_get_dev_context_loss_count; pdata->regs = kzalloc(sizeof(struct omap_gpio_reg_offs), GFP_KERNEL); if (!pdata) { pr_err("gpio%d: Memory allocation failed\n", id); diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index fc6987578920..59c6dc16dd1d 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -75,16 +75,6 @@ static struct powerdomain *mpu_pwrdm, *neon_pwrdm; static struct powerdomain *core_pwrdm, *per_pwrdm; static struct powerdomain *cam_pwrdm; -static inline void omap3_per_save_context(void) -{ - omap_gpio_save_context(); -} - -static inline void omap3_per_restore_context(void) -{ - omap_gpio_restore_context(); -} - static void omap3_enable_io_chain(void) { int timeout = 0; @@ -332,8 +322,6 @@ void omap_sram_idle(void) if (per_next_state < PWRDM_POWER_ON) { per_going_off = (per_next_state == PWRDM_POWER_OFF) ? 1 : 0; omap2_gpio_prepare_for_idle(per_going_off); - if (per_next_state == PWRDM_POWER_OFF) - omap3_per_save_context(); } /* CORE */ @@ -399,8 +387,6 @@ void omap_sram_idle(void) if (per_next_state < PWRDM_POWER_ON) { per_prev_state = pwrdm_read_prev_pwrst(per_pwrdm); omap2_gpio_resume_after_idle(); - if (per_prev_state == PWRDM_POWER_OFF) - omap3_per_restore_context(); } /* Disable IO-PAD and IO-CHAIN wakeup */ diff --git a/arch/arm/plat-omap/include/plat/gpio.h b/arch/arm/plat-omap/include/plat/gpio.h index 6eb035c0cc16..c1ddc5a3de2a 100644 --- a/arch/arm/plat-omap/include/plat/gpio.h +++ b/arch/arm/plat-omap/include/plat/gpio.h @@ -201,14 +201,15 @@ struct omap_gpio_platform_data { bool loses_context; /* whether the bank would ever lose context */ struct omap_gpio_reg_offs *regs; + + /* Return context loss count due to PM states changing */ + int (*get_context_loss_count)(struct device *dev); }; extern void omap2_gpio_prepare_for_idle(int off_mode); extern void omap2_gpio_resume_after_idle(void); extern void omap_set_gpio_debounce(int gpio, int enable); extern void omap_set_gpio_debounce_time(int gpio, int enable); -extern void omap_gpio_save_context(void); -extern void omap_gpio_restore_context(void); /*-------------------------------------------------------------------------*/ /* Wrappers for "new style" GPIO calls, using the new infrastructure diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c index 6788c8a2a770..a1a3b9dca178 100644 --- a/drivers/gpio/gpio-omap.c +++ b/drivers/gpio/gpio-omap.c @@ -72,9 +72,11 @@ struct gpio_bank { bool loses_context; int stride; u32 width; + int context_loss_count; u16 id; void (*set_dataout)(struct gpio_bank *bank, int gpio, int enable); + int (*get_context_loss_count)(struct device *dev); struct omap_gpio_reg_offs *regs; }; @@ -1179,6 +1181,7 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev) bank->stride = pdata->bank_stride; bank->width = pdata->bank_width; bank->loses_context = pdata->loses_context; + bank->get_context_loss_count = pdata->get_context_loss_count; bank->regs = pdata->regs; if (bank->regs->set_dataout && bank->regs->clr_dataout) @@ -1323,11 +1326,11 @@ static struct syscore_ops omap_gpio_syscore_ops = { #ifdef CONFIG_ARCH_OMAP2PLUS -static int workaround_enabled; +static void omap_gpio_save_context(struct gpio_bank *bank); +static void omap_gpio_restore_context(struct gpio_bank *bank); void omap2_gpio_prepare_for_idle(int off_mode) { - int c = 0; struct gpio_bank *bank; list_for_each_entry(bank, &omap_gpio_list, node) { @@ -1347,7 +1350,7 @@ void omap2_gpio_prepare_for_idle(int off_mode) * non-wakeup GPIOs. Otherwise spurious IRQs will be * generated. See OMAP2420 Errata item 1.101. */ if (!(bank->enabled_non_wakeup_gpios)) - continue; + goto save_gpio_context; if (cpu_is_omap24xx() || cpu_is_omap34xx()) { bank->saved_datain = __raw_readl(bank->base + @@ -1384,13 +1387,13 @@ void omap2_gpio_prepare_for_idle(int off_mode) __raw_writel(l2, bank->base + OMAP4_GPIO_RISINGDETECT); } - c++; - } - if (!c) { - workaround_enabled = 0; - return; +save_gpio_context: + if (bank->get_context_loss_count) + bank->context_loss_count = + bank->get_context_loss_count(bank->dev); + + omap_gpio_save_context(bank); } - workaround_enabled = 1; } void omap2_gpio_resume_after_idle(void) @@ -1398,6 +1401,7 @@ void omap2_gpio_resume_after_idle(void) struct gpio_bank *bank; list_for_each_entry(bank, &omap_gpio_list, node) { + int context_lost_cnt_after; u32 l = 0, gen, gen0, gen1; int j; @@ -1407,8 +1411,13 @@ void omap2_gpio_resume_after_idle(void) for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++) clk_enable(bank->dbck); - if (!workaround_enabled) - continue; + if (bank->get_context_loss_count) { + context_lost_cnt_after = + bank->get_context_loss_count(bank->dev); + if (context_lost_cnt_after != bank->context_loss_count + || !context_lost_cnt_after) + omap_gpio_restore_context(bank); + } if (!(bank->enabled_non_wakeup_gpios)) continue; @@ -1486,74 +1495,50 @@ void omap2_gpio_resume_after_idle(void) } } } - } -#endif - -#ifdef CONFIG_ARCH_OMAP3 -void omap_gpio_save_context(void) +static void omap_gpio_save_context(struct gpio_bank *bank) { - struct gpio_bank *bank; - - list_for_each_entry(bank, &omap_gpio_list, node) { - - if (!bank->loses_context) - continue; - - bank->context.irqenable1 = - __raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE1); - bank->context.irqenable2 = - __raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE2); - bank->context.wake_en = - __raw_readl(bank->base + OMAP24XX_GPIO_WAKE_EN); - bank->context.ctrl = - __raw_readl(bank->base + OMAP24XX_GPIO_CTRL); - bank->context.oe = - __raw_readl(bank->base + OMAP24XX_GPIO_OE); - bank->context.leveldetect0 = - __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0); - bank->context.leveldetect1 = - __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1); - bank->context.risingdetect = - __raw_readl(bank->base + OMAP24XX_GPIO_RISINGDETECT); - bank->context.fallingdetect = - __raw_readl(bank->base + OMAP24XX_GPIO_FALLINGDETECT); - bank->context.dataout = - __raw_readl(bank->base + OMAP24XX_GPIO_DATAOUT); - } + bank->context.irqenable1 = + __raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE1); + bank->context.irqenable2 = + __raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE2); + bank->context.wake_en = + __raw_readl(bank->base + OMAP24XX_GPIO_WAKE_EN); + bank->context.ctrl = __raw_readl(bank->base + OMAP24XX_GPIO_CTRL); + bank->context.oe = __raw_readl(bank->base + OMAP24XX_GPIO_OE); + bank->context.leveldetect0 = + __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0); + bank->context.leveldetect1 = + __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1); + bank->context.risingdetect = + __raw_readl(bank->base + OMAP24XX_GPIO_RISINGDETECT); + bank->context.fallingdetect = + __raw_readl(bank->base + OMAP24XX_GPIO_FALLINGDETECT); + bank->context.dataout = + __raw_readl(bank->base + OMAP24XX_GPIO_DATAOUT); } -void omap_gpio_restore_context(void) +static void omap_gpio_restore_context(struct gpio_bank *bank) { - struct gpio_bank *bank; - - list_for_each_entry(bank, &omap_gpio_list, node) { - - if (!bank->loses_context) - continue; - - __raw_writel(bank->context.irqenable1, - bank->base + OMAP24XX_GPIO_IRQENABLE1); - __raw_writel(bank->context.irqenable2, - bank->base + OMAP24XX_GPIO_IRQENABLE2); - __raw_writel(bank->context.wake_en, - bank->base + OMAP24XX_GPIO_WAKE_EN); - __raw_writel(bank->context.ctrl, - bank->base + OMAP24XX_GPIO_CTRL); - __raw_writel(bank->context.oe, - bank->base + OMAP24XX_GPIO_OE); - __raw_writel(bank->context.leveldetect0, - bank->base + OMAP24XX_GPIO_LEVELDETECT0); - __raw_writel(bank->context.leveldetect1, - bank->base + OMAP24XX_GPIO_LEVELDETECT1); - __raw_writel(bank->context.risingdetect, - bank->base + OMAP24XX_GPIO_RISINGDETECT); - __raw_writel(bank->context.fallingdetect, - bank->base + OMAP24XX_GPIO_FALLINGDETECT); - __raw_writel(bank->context.dataout, - bank->base + OMAP24XX_GPIO_DATAOUT); - } + __raw_writel(bank->context.irqenable1, + bank->base + OMAP24XX_GPIO_IRQENABLE1); + __raw_writel(bank->context.irqenable2, + bank->base + OMAP24XX_GPIO_IRQENABLE2); + __raw_writel(bank->context.wake_en, + bank->base + OMAP24XX_GPIO_WAKE_EN); + __raw_writel(bank->context.ctrl, bank->base + OMAP24XX_GPIO_CTRL); + __raw_writel(bank->context.oe, bank->base + OMAP24XX_GPIO_OE); + __raw_writel(bank->context.leveldetect0, + bank->base + OMAP24XX_GPIO_LEVELDETECT0); + __raw_writel(bank->context.leveldetect1, + bank->base + OMAP24XX_GPIO_LEVELDETECT1); + __raw_writel(bank->context.risingdetect, + bank->base + OMAP24XX_GPIO_RISINGDETECT); + __raw_writel(bank->context.fallingdetect, + bank->base + OMAP24XX_GPIO_FALLINGDETECT); + __raw_writel(bank->context.dataout, + bank->base + OMAP24XX_GPIO_DATAOUT); } #endif -- 2.34.1