From e198a8de14d4bb122b821432fadb28eedd4b4507 Mon Sep 17 00:00:00 2001 From: Deepak Sikri Date: Fri, 18 Nov 2011 15:20:12 +0530 Subject: GPIO/pl061: Add suspend resume capability This patch adds the suspend and resume operations in the driver. The patch ensures the data save and restore for the device registers during the suspend and resume operations respectively. Signed-off-by: Deepak Sikri Signed-off-by: Viresh Kumar Acked-by: Baruch Siach Acked-by: Rafael J. Wysocki Acked-by: Linus Walleij Signed-off-by: Grant Likely --- drivers/gpio/gpio-pl061.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) (limited to 'drivers/gpio') diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c index 093c90bd3c1..42a5d567269 100644 --- a/drivers/gpio/gpio-pl061.c +++ b/drivers/gpio/gpio-pl061.c @@ -23,6 +23,7 @@ #include #include #include +#include #define GPIODIR 0x400 #define GPIOIS 0x404 @@ -35,6 +36,17 @@ #define PL061_GPIO_NR 8 +#ifdef CONFIG_PM +struct pl061_context_save_regs { + u8 gpio_data; + u8 gpio_dir; + u8 gpio_is; + u8 gpio_ibe; + u8 gpio_iev; + u8 gpio_ie; +}; +#endif + struct pl061_gpio { /* We use a list of pl061_gpio structs for each trigger IRQ in the main * interrupts controller of the system. We need this to support systems @@ -54,6 +66,10 @@ struct pl061_gpio { void __iomem *base; unsigned irq_base; struct gpio_chip gc; + +#ifdef CONFIG_PM + struct pl061_context_save_regs csave_regs; +#endif }; static int pl061_direction_input(struct gpio_chip *gc, unsigned offset) @@ -330,6 +346,8 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id) irq_set_chip_data(i + chip->irq_base, chip); } + amba_set_drvdata(dev, chip); + return 0; iounmap: @@ -342,6 +360,53 @@ free_mem: return ret; } +#ifdef CONFIG_PM +static int pl061_suspend(struct device *dev) +{ + struct pl061_gpio *chip = dev_get_drvdata(dev); + int offset; + + chip->csave_regs.gpio_data = 0; + chip->csave_regs.gpio_dir = readb(chip->base + GPIODIR); + chip->csave_regs.gpio_is = readb(chip->base + GPIOIS); + chip->csave_regs.gpio_ibe = readb(chip->base + GPIOIBE); + chip->csave_regs.gpio_iev = readb(chip->base + GPIOIEV); + chip->csave_regs.gpio_ie = readb(chip->base + GPIOIE); + + for (offset = 0; offset < PL061_GPIO_NR; offset++) { + if (chip->csave_regs.gpio_dir & (1 << offset)) + chip->csave_regs.gpio_data |= + pl061_get_value(&chip->gc, offset) << offset; + } + + return 0; +} + +static int pl061_resume(struct device *dev) +{ + struct pl061_gpio *chip = dev_get_drvdata(dev); + int offset; + + for (offset = 0; offset < PL061_GPIO_NR; offset++) { + if (chip->csave_regs.gpio_dir & (1 << offset)) + pl061_direction_output(&chip->gc, offset, + chip->csave_regs.gpio_data & + (1 << offset)); + else + pl061_direction_input(&chip->gc, offset); + } + + writeb(chip->csave_regs.gpio_is, chip->base + GPIOIS); + writeb(chip->csave_regs.gpio_ibe, chip->base + GPIOIBE); + writeb(chip->csave_regs.gpio_iev, chip->base + GPIOIEV); + writeb(chip->csave_regs.gpio_ie, chip->base + GPIOIE); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(pl061_dev_pm_ops, pl061_suspend, pl061_resume); +#endif + static struct amba_id pl061_ids[] = { { .id = 0x00041061, @@ -353,6 +418,9 @@ static struct amba_id pl061_ids[] = { static struct amba_driver pl061_gpio_driver = { .drv = { .name = "pl061_gpio", +#ifdef CONFIG_PM + .pm = &pl061_dev_pm_ops, +#endif }, .id_table = pl061_ids, .probe = pl061_probe, -- cgit v1.2.3-70-g09d2