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authorRabin Vincent <rabin.vincent@stericsson.com>2010-03-17 10:49:04 +0100
committerLinus Walleij <linus.walleij@linaro.org>2011-03-14 14:05:15 +0100
commitc84c7c08e320acfd10a0b7e55dbb0bc819b6d284 (patch)
treef9f4f13608e50c7b85ba5ef664382af6b1723d4d /arch/arm/plat-nomadik/gpio.c
parentplat-nomadik: add custom dbg_show for GPIO (diff)
downloadlinux-c84c7c08e320acfd10a0b7e55dbb0bc819b6d284.tar.xz
linux-c84c7c08e320acfd10a0b7e55dbb0bc819b6d284.zip
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>
Diffstat (limited to 'arch/arm/plat-nomadik/gpio.c')
-rw-r--r--arch/arm/plat-nomadik/gpio.c51
1 files changed, 49 insertions, 2 deletions
diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c
index 5b5fd1ee3c04..46f1af869b7f 100644
--- a/arch/arm/plat-nomadik/gpio.c
+++ b/arch/arm/plat-nomadik/gpio.c
@@ -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)