[PATCH 02/27] OMAP3: PM: GPIO context save/restore

[Kevin Hilman]

From: Rajendra Nayak <rnayak at ti.com>

Signed-off-by: Rajendra Nayak <rnayak at ti.com>
Signed-off-by: Kevin Hilman <khilman at deeprootsystems.com>
---
 arch/arm/plat-omap/gpio.c              |   93 ++++++++++++++++++++++++++++++++
 arch/arm/plat-omap/include/mach/gpio.h |    3 +-
 2 files changed, 95 insertions(+), 1 deletions(-)

diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index b1af0c2..48ce218 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -260,6 +260,23 @@ static struct gpio_bank gpio_bank_34xx[6] = {
 	{ OMAP34XX_GPIO6_BASE, INT_34XX_GPIO_BANK6, IH_GPIO_BASE + 160, METHOD_GPIO_24XX },
 };
 
+struct omap3_gpio_regs {
+	u32 sysconfig;
+	u32 irqenable1;
+	u32 irqenable2;
+	u32 wake_en;
+	u32 ctrl;
+	u32 oe;
+	u32 leveldetect0;
+	u32 leveldetect1;
+	u32 risingdetect;
+	u32 fallingdetect;
+	u32 dataout;
+	u32 setwkuena;
+	u32 setdataout;
+};
+
+static struct omap3_gpio_regs gpio_context[OMAP34XX_NR_GPIOS];
 #endif
 
 #ifdef CONFIG_ARCH_OMAP4
@@ -2002,6 +2019,82 @@ void omap2_gpio_resume_after_retention(void)
 
 #endif
 
+#ifdef CONFIG_ARCH_OMAP34XX
+/* save the registers of bank 2-6 */
+void omap3_gpio_save_context(void)
+{
+	int i;
+
+	/* saving banks from 2-6 only since GPIO1 is in WKUP */
+	for (i = 1; i < gpio_bank_count; i++) {
+		struct gpio_bank *bank = &gpio_bank[i];
+		gpio_context[i].sysconfig =
+			__raw_readl(bank->base + OMAP24XX_GPIO_SYSCONFIG);
+		gpio_context[i].irqenable1 =
+			__raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE1);
+		gpio_context[i].irqenable2 =
+			__raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE2);
+		gpio_context[i].wake_en =
+			__raw_readl(bank->base + OMAP24XX_GPIO_WAKE_EN);
+		gpio_context[i].ctrl =
+			__raw_readl(bank->base + OMAP24XX_GPIO_CTRL);
+		gpio_context[i].oe =
+			__raw_readl(bank->base + OMAP24XX_GPIO_OE);
+		gpio_context[i].leveldetect0 =
+			__raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0);
+		gpio_context[i].leveldetect1 =
+			__raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1);
+		gpio_context[i].risingdetect =
+			__raw_readl(bank->base + OMAP24XX_GPIO_RISINGDETECT);
+		gpio_context[i].fallingdetect =
+			__raw_readl(bank->base + OMAP24XX_GPIO_FALLINGDETECT);
+		gpio_context[i].dataout =
+			__raw_readl(bank->base + OMAP24XX_GPIO_DATAOUT);
+		gpio_context[i].setwkuena =
+			__raw_readl(bank->base + OMAP24XX_GPIO_SETWKUENA);
+		gpio_context[i].setdataout =
+			__raw_readl(bank->base + OMAP24XX_GPIO_SETDATAOUT);
+	}
+}
+EXPORT_SYMBOL(omap3_gpio_save_context);
+
+/* restore the required registers of bank 2-6 */
+void omap3_gpio_restore_context(void)
+{
+	int i;
+	for (i = 1; i < gpio_bank_count; i++) {
+		struct gpio_bank *bank = &gpio_bank[i];
+		__raw_writel(gpio_context[i].sysconfig,
+				bank->base + OMAP24XX_GPIO_SYSCONFIG);
+		__raw_writel(gpio_context[i].irqenable1,
+				bank->base + OMAP24XX_GPIO_IRQENABLE1);
+		__raw_writel(gpio_context[i].irqenable2,
+				bank->base + OMAP24XX_GPIO_IRQENABLE2);
+		__raw_writel(gpio_context[i].wake_en,
+				bank->base + OMAP24XX_GPIO_WAKE_EN);
+		__raw_writel(gpio_context[i].ctrl,
+				bank->base + OMAP24XX_GPIO_CTRL);
+		__raw_writel(gpio_context[i].oe,
+				bank->base + OMAP24XX_GPIO_OE);
+		__raw_writel(gpio_context[i].leveldetect0,
+				bank->base + OMAP24XX_GPIO_LEVELDETECT0);
+		__raw_writel(gpio_context[i].leveldetect1,
+				bank->base + OMAP24XX_GPIO_LEVELDETECT1);
+		__raw_writel(gpio_context[i].risingdetect,
+				bank->base + OMAP24XX_GPIO_RISINGDETECT);
+		__raw_writel(gpio_context[i].fallingdetect,
+				bank->base + OMAP24XX_GPIO_FALLINGDETECT);
+		__raw_writel(gpio_context[i].dataout,
+				bank->base + OMAP24XX_GPIO_DATAOUT);
+		__raw_writel(gpio_context[i].setwkuena,
+				bank->base + OMAP24XX_GPIO_SETWKUENA);
+		__raw_writel(gpio_context[i].setdataout,
+				bank->base + OMAP24XX_GPIO_SETDATAOUT);
+	}
+}
+EXPORT_SYMBOL(omap3_gpio_restore_context);
+#endif
+
 /*
  * This may get called early from board specific init
  * for boards that have interrupts routed via FPGA.
diff --git a/arch/arm/plat-omap/include/mach/gpio.h b/arch/arm/plat-omap/include/mach/gpio.h
index 633ff68..7310414 100644
--- a/arch/arm/plat-omap/include/mach/gpio.h
+++ b/arch/arm/plat-omap/include/mach/gpio.h
@@ -76,7 +76,8 @@ extern void omap2_gpio_prepare_for_retention(void);
 extern void omap2_gpio_resume_after_retention(void);
 extern void omap_set_gpio_debounce(int gpio, int enable);
 extern void omap_set_gpio_debounce_time(int gpio, int enable);
-
+extern void omap3_gpio_save_context(void);
+extern void omap3_gpio_restore_context(void);
 /*-------------------------------------------------------------------------*/
 
 /* Wrappers for "new style" GPIO calls, using the new infrastructure
-- 
1.6.4.3