[PATCH 2/7] OMAP: GPIO: Use flag to identify wkup dmn GPIO

[charu@ti.com (Varadarajan, Charulatha)]

From: Charulatha V <charu@ti.com>

In omap3, save/restore context is implemented for GPIO
banks 2-6 as GPIO bank1 is in wakeup domain. Instead
of identifying bank's power domain by bank id, make use
of a flag "losses_context" which is filled by
pwrdm_can_ever_lose_context() during dev_init.

For getting the powerdomain pointer, omap_hwmod_get_pwrdm()
is used. omap_device_get_pwrdm() could not be used as the
pwrdm information needs to be filled in pdata, whereas
omap_device_get_pwrdm() could be used only after
omap_device_build() call.

Signed-off-by: Charulatha V <charu@ti.com>
---
 arch/arm/mach-omap2/gpio.c             |    6 ++++++
 arch/arm/plat-omap/gpio.c              |   31 ++++++++++++++++++++-----------
 arch/arm/plat-omap/include/plat/gpio.h |    1 +
 3 files changed, 27 insertions(+), 11 deletions(-)

diff --git a/arch/arm/mach-omap2/gpio.c b/arch/arm/mach-omap2/gpio.c
index 9529842..1f1c604 100644
--- a/arch/arm/mach-omap2/gpio.c
+++ b/arch/arm/mach-omap2/gpio.c
@@ -24,6 +24,8 @@
 #include <plat/omap_hwmod.h>
 #include <plat/omap_device.h>
 
+#include "powerdomain.h"
+
 static struct omap_device_pm_latency omap_gpio_latency[] = {
 	[0] = {
 		.deactivate_func = omap_device_idle_hwmods,
@@ -39,6 +41,7 @@ static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
 	struct omap_gpio_dev_attr *dev_attr;
 	char *name = "omap_gpio";
 	int id;
+	struct powerdomain *pwrdm;
 
 	/*
 	 * extract the device id from name field available in the
@@ -75,6 +78,9 @@ static int omap2_gpio_dev_init(struct omap_hwmod *oh, void *unused)
 		return -EINVAL;
 	}
 
+	pwrdm = omap_hwmod_get_pwrdm(oh);
+	pdata->looses_context = pwrdm_can_ever_lose_context(pwrdm);
+
 	od = omap_device_build(name, id - 1, oh, pdata,
 				sizeof(*pdata),	omap_gpio_latency,
 				ARRAY_SIZE(omap_gpio_latency),
diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index c8736b0..74085b5 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -172,6 +172,7 @@ struct gpio_bank {
 	struct device *dev;
 	bool dbck_flag;
 	int stride;
+	bool looses_context;
 };
 
 /*
@@ -1711,6 +1712,7 @@ static int __devinit omap_gpio_probe(struct platform_device *pdev)
 	bank->dbck_flag = pdata->dbck_flag;
 	bank->stride = pdata->bank_stride;
 	bank_width = pdata->bank_width;
+	bank->looses_context = pdata->looses_context;
 
 	spin_lock_init(&bank->lock);
 
@@ -1856,16 +1858,15 @@ static int workaround_enabled;
 void omap2_gpio_prepare_for_idle(int off_mode)
 {
 	int i, c = 0;
-	int min = 0;
 
-	if (cpu_is_omap34xx())
-		min = 1;
-
-	for (i = min; i < gpio_bank_count; i++) {
+	for (i = 0; i < gpio_bank_count; i++) {
 		struct gpio_bank *bank = &gpio_bank[i];
 		u32 l1 = 0, l2 = 0;
 		int j;
 
+		if (!bank->looses_context)
+			continue;
+
 		for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++)
 			clk_disable(bank->dbck);
 
@@ -1925,15 +1926,15 @@ void omap2_gpio_prepare_for_idle(int off_mode)
 void omap2_gpio_resume_after_idle(void)
 {
 	int i;
-	int min = 0;
 
-	if (cpu_is_omap34xx())
-		min = 1;
-	for (i = min; i < gpio_bank_count; i++) {
+	for (i = 0; i < gpio_bank_count; i++) {
 		struct gpio_bank *bank = &gpio_bank[i];
 		u32 l = 0, gen, gen0, gen1;
 		int j;
 
+		if (!bank->looses_context)
+			continue;
+
 		for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++)
 			clk_enable(bank->dbck);
 
@@ -2028,8 +2029,12 @@ void omap_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++) {
+	for (i = 0; i < gpio_bank_count; i++) {
 		struct gpio_bank *bank = &gpio_bank[i];
+
+		if (!bank->looses_context)
+			continue;
+
 		bank->context.irqenable1 =
 			__raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE1);
 		bank->context.irqenable2 =
@@ -2058,8 +2063,12 @@ void omap_gpio_restore_context(void)
 {
 	int i;
 
-	for (i = 1; i < gpio_bank_count; i++) {
+	for (i = 0; i < gpio_bank_count; i++) {
 		struct gpio_bank *bank = &gpio_bank[i];
+
+		if (!bank->looses_context)
+			continue;
+
 		__raw_writel(bank->context.irqenable1,
 				bank->base + OMAP24XX_GPIO_IRQENABLE1);
 		__raw_writel(bank->context.irqenable2,
diff --git a/arch/arm/plat-omap/include/plat/gpio.h b/arch/arm/plat-omap/include/plat/gpio.h
index cac2e8a..15aeb71 100644
--- a/arch/arm/plat-omap/include/plat/gpio.h
+++ b/arch/arm/plat-omap/include/plat/gpio.h
@@ -77,6 +77,7 @@ struct omap_gpio_platform_data {
 	int bank_width;		/* GPIO bank width */
 	int bank_stride;	/* Only needed for omap1 MPUIO */
 	bool dbck_flag;		/* dbck required or not - True for OMAP3&4 */
+	bool looses_context;	/* whether the bank would ever loose context */
 };
 
 /* TODO: Analyze removing gpio_bank_count usage from driver code */
-- 
1.7.1