releases/3.11.5/gpio-omap-maintain-gpio-and-irq-usage-separately.patch

From fa365e4d729065b5e85165df3dc9699ed47489cc Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Date: Wed, 25 Sep 2013 02:36:52 +0200
Subject: gpio/omap: maintain GPIO and IRQ usage separately

From: Javier Martinez Canillas <javier.martinez@collabora.co.uk>

commit fa365e4d729065b5e85165df3dc9699ed47489cc upstream.

The GPIO OMAP controller pins can be used as IRQ and GPIO
independently so is necessary to keep track GPIO pins and
IRQ lines usage separately to make sure that the bank will
always be enabled while being used.

Also move gpio_is_input() definition in preparation for the
next patch that setups the controller's irq_chip driver when
a caller requests an interrupt line.

Acked-by: Stephen Warren <swarren@nvidia.com>
Tested-by: George Cherian <george.cherian@ti.com>
Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Tested-by: Lars Poeschel <poeschel@lemonage.de>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Tested-by: Kevin Hilman <khilman@linaro.org>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpio/gpio-omap.c |   35 +++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)

--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -63,6 +63,7 @@ struct gpio_bank {
 	struct gpio_chip chip;
 	struct clk *dbck;
 	u32 mod_usage;
+	u32 irq_usage;
 	u32 dbck_enable_mask;
 	bool dbck_enabled;
 	struct device *dev;
@@ -86,6 +87,9 @@ struct gpio_bank {
 #define GPIO_BIT(bank, gpio) (1 << GPIO_INDEX(bank, gpio))
 #define GPIO_MOD_CTRL_BIT	BIT(0)
 
+#define BANK_USED(bank) (bank->mod_usage || bank->irq_usage)
+#define LINE_USED(line, offset) (line & (1 << offset))
+
 static int irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq)
 {
 	return bank->chip.base + gpio_irq;
@@ -420,6 +424,13 @@ static int _set_gpio_triggering(struct g
 	return 0;
 }
 
+static int gpio_is_input(struct gpio_bank *bank, int mask)
+{
+	void __iomem *reg = bank->base + bank->regs->direction;
+
+	return __raw_readl(reg) & mask;
+}
+
 static int gpio_irq_type(struct irq_data *d, unsigned type)
 {
 	struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
@@ -427,7 +438,7 @@ static int gpio_irq_type(struct irq_data
 	int retval;
 	unsigned long flags;
 
-	if (WARN_ON(!bank->mod_usage))
+	if (WARN_ON(!BANK_USED(bank)))
 		return -EINVAL;
 
 #ifdef CONFIG_ARCH_OMAP1
@@ -447,6 +458,7 @@ static int gpio_irq_type(struct irq_data
 
 	spin_lock_irqsave(&bank->lock, flags);
 	retval = _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), type);
+	bank->irq_usage |= 1 << GPIO_INDEX(bank, gpio);
 	spin_unlock_irqrestore(&bank->lock, flags);
 
 	if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
@@ -603,7 +615,7 @@ static int omap_gpio_request(struct gpio
 	 * If this is the first gpio_request for the bank,
 	 * enable the bank module.
 	 */
-	if (!bank->mod_usage)
+	if (!BANK_USED(bank))
 		pm_runtime_get_sync(bank->dev);
 
 	spin_lock_irqsave(&bank->lock, flags);
@@ -619,7 +631,7 @@ static int omap_gpio_request(struct gpio
 		__raw_writel(__raw_readl(reg) | (1 << offset), reg);
 	}
 
-	if (bank->regs->ctrl && !bank->mod_usage) {
+	if (bank->regs->ctrl && !BANK_USED(bank)) {
 		void __iomem *reg = bank->base + bank->regs->ctrl;
 		u32 ctrl;
 
@@ -654,7 +666,7 @@ static void omap_gpio_free(struct gpio_c
 
 	bank->mod_usage &= ~(1 << offset);
 
-	if (bank->regs->ctrl && !bank->mod_usage) {
+	if (bank->regs->ctrl && !BANK_USED(bank)) {
 		void __iomem *reg = bank->base + bank->regs->ctrl;
 		u32 ctrl;
 
@@ -672,7 +684,7 @@ static void omap_gpio_free(struct gpio_c
 	 * If this is the last gpio to be freed in the bank,
 	 * disable the bank module.
 	 */
-	if (!bank->mod_usage)
+	if (!BANK_USED(bank))
 		pm_runtime_put(bank->dev);
 }
 
@@ -762,8 +774,10 @@ static void gpio_irq_shutdown(struct irq
 	struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
 	unsigned int gpio = irq_to_gpio(bank, d->hwirq);
 	unsigned long flags;
+	unsigned offset = GPIO_INDEX(bank, gpio);
 
 	spin_lock_irqsave(&bank->lock, flags);
+	bank->irq_usage &= ~(1 << offset);
 	_reset_gpio(bank, gpio);
 	spin_unlock_irqrestore(&bank->lock, flags);
 }
@@ -897,13 +911,6 @@ static int gpio_input(struct gpio_chip *
 	return 0;
 }
 
-static int gpio_is_input(struct gpio_bank *bank, int mask)
-{
-	void __iomem *reg = bank->base + bank->regs->direction;
-
-	return __raw_readl(reg) & mask;
-}
-
 static int gpio_get(struct gpio_chip *chip, unsigned offset)
 {
 	struct gpio_bank *bank;
@@ -1400,7 +1407,7 @@ void omap2_gpio_prepare_for_idle(int pwr
 	struct gpio_bank *bank;
 
 	list_for_each_entry(bank, &omap_gpio_list, node) {
-		if (!bank->mod_usage || !bank->loses_context)
+		if (!BANK_USED(bank) || !bank->loses_context)
 			continue;
 
 		bank->power_mode = pwr_mode;
@@ -1414,7 +1421,7 @@ void omap2_gpio_resume_after_idle(void)
 	struct gpio_bank *bank;
 
 	list_for_each_entry(bank, &omap_gpio_list, node) {
-		if (!bank->mod_usage || !bank->loses_context)
+		if (!BANK_USED(bank) || !bank->loses_context)
 			continue;
 
 		pm_runtime_get_sync(bank->dev);