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plat-nomadik: implement suspend/resume for GPIO 

Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Rabin Vincent 2010-03-17 15:19:04 +05:30 committed by Linus Walleij
parent d0b543c772
commit c84c7c08e3
1 changed files with 49 additions and 2 deletions
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51
arch/arm/plat-nomadik/gpio.c
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@ -44,6 +44,7 @@ struct nmk_gpio_chip {
/* Keep track of configured edges */
u32 edge_rising;
u32 edge_falling;
u32 backup[10];
};
static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip,
@ -792,14 +793,60 @@ out:
return ret;
}
#ifdef CONFIG_PM
static int nmk_gpio_pm(struct platform_device *dev, bool suspend)
{
struct nmk_gpio_chip *nmk_chip = platform_get_drvdata(dev);
int i;
static const unsigned int regs[] = {
NMK_GPIO_DAT,
NMK_GPIO_PDIS,
NMK_GPIO_DIR,
NMK_GPIO_AFSLA,
NMK_GPIO_AFSLB,
NMK_GPIO_SLPC,
NMK_GPIO_RIMSC,
NMK_GPIO_FIMSC,
NMK_GPIO_RWIMSC,
NMK_GPIO_FWIMSC,
};
BUILD_BUG_ON(ARRAY_SIZE(nmk_chip->backup) != ARRAY_SIZE(regs));
/* XXX: is this sufficient? what about pull-up/down configuration? */
for (i = 0; i < ARRAY_SIZE(regs); i++) {
if (suspend)
nmk_chip->backup[i] = readl(nmk_chip->addr + regs[i]);
else
writel(nmk_chip->backup[i], nmk_chip->addr + regs[i]);
}
return 0;
}
static int nmk_gpio_suspend(struct platform_device *dev, pm_message_t state)
{
return nmk_gpio_pm(dev, true);
}
static int nmk_gpio_resume(struct platform_device *dev)
{
return nmk_gpio_pm(dev, false);
}
#else
#define nmk_gpio_suspend NULL
#define nmk_gpio_resume NULL
#endif
static struct platform_driver nmk_gpio_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "gpio",
},
.probe = nmk_gpio_probe,
.suspend = NULL, /* to be done */
.resume = NULL,
.suspend = nmk_gpio_suspend,
.resume = nmk_gpio_resume,
};
static int __init nmk_gpio_init(void)