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path: root/drivers/gpio/gpio-tegra.c
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Diffstat (limited to 'drivers/gpio/gpio-tegra.c')
-rw-r--r--drivers/gpio/gpio-tegra.c125
1 files changed, 81 insertions, 44 deletions
diff --git a/drivers/gpio/gpio-tegra.c b/drivers/gpio/gpio-tegra.c
index d982593d756..4e8fb8261a8 100644
--- a/drivers/gpio/gpio-tegra.c
+++ b/drivers/gpio/gpio-tegra.c
@@ -17,6 +17,7 @@
*
*/
+#include <linux/err.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
@@ -26,9 +27,9 @@
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/irqdomain.h>
+#include <linux/irqchip/chained_irq.h>
#include <linux/pinctrl/consumer.h>
-
-#include <asm/mach/irq.h>
+#include <linux/pm.h>
#define GPIO_BANK(x) ((x) >> 5)
#define GPIO_PORT(x) (((x) >> 3) & 0x3)
@@ -64,15 +65,17 @@ struct tegra_gpio_bank {
int bank;
int irq;
spinlock_t lvl_lock[4];
-#ifdef CONFIG_PM
+#ifdef CONFIG_PM_SLEEP
u32 cnf[4];
u32 out[4];
u32 oe[4];
u32 int_enb[4];
u32 int_lvl[4];
+ u32 wake_enb[4];
#endif
};
+static struct device *dev;
static struct irq_domain *irq_domain;
static void __iomem *regs;
static u32 tegra_gpio_bank_count;
@@ -109,20 +112,18 @@ static void tegra_gpio_enable(int gpio)
{
tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 1);
}
-EXPORT_SYMBOL_GPL(tegra_gpio_enable);
static void tegra_gpio_disable(int gpio)
{
tegra_gpio_mask_write(GPIO_MSK_CNF(gpio), gpio, 0);
}
-EXPORT_SYMBOL_GPL(tegra_gpio_disable);
-int tegra_gpio_request(struct gpio_chip *chip, unsigned offset)
+static int tegra_gpio_request(struct gpio_chip *chip, unsigned offset)
{
return pinctrl_request_gpio(offset);
}
-void tegra_gpio_free(struct gpio_chip *chip, unsigned offset)
+static void tegra_gpio_free(struct gpio_chip *chip, unsigned offset)
{
pinctrl_free_gpio(offset);
tegra_gpio_disable(offset);
@@ -135,6 +136,11 @@ static void tegra_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
static int tegra_gpio_get(struct gpio_chip *chip, unsigned offset)
{
+ /* If gpio is in output mode then read from the out value */
+ if ((tegra_gpio_readl(GPIO_OE(offset)) >> GPIO_BIT(offset)) & 1)
+ return (tegra_gpio_readl(GPIO_OUT(offset)) >>
+ GPIO_BIT(offset)) & 0x1;
+
return (tegra_gpio_readl(GPIO_IN(offset)) >> GPIO_BIT(offset)) & 0x1;
}
@@ -200,6 +206,7 @@ static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
int lvl_type;
int val;
unsigned long flags;
+ int ret;
switch (type & IRQ_TYPE_SENSE_MASK) {
case IRQ_TYPE_EDGE_RISING:
@@ -226,6 +233,12 @@ static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
return -EINVAL;
}
+ ret = gpio_lock_as_irq(&tegra_gpio_chip, gpio);
+ if (ret) {
+ dev_err(dev, "unable to lock Tegra GPIO %d as IRQ\n", gpio);
+ return ret;
+ }
+
spin_lock_irqsave(&bank->lvl_lock[port], flags);
val = tegra_gpio_readl(GPIO_INT_LVL(gpio));
@@ -246,6 +259,13 @@ static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type)
return 0;
}
+static void tegra_gpio_irq_shutdown(struct irq_data *d)
+{
+ int gpio = d->hwirq;
+
+ gpio_unlock_as_irq(&tegra_gpio_chip, gpio);
+}
+
static void tegra_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
{
struct tegra_gpio_bank *bank;
@@ -285,8 +305,8 @@ static void tegra_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
}
-#ifdef CONFIG_PM
-void tegra_gpio_resume(void)
+#ifdef CONFIG_PM_SLEEP
+static int tegra_gpio_resume(struct device *dev)
{
unsigned long flags;
int b;
@@ -308,9 +328,10 @@ void tegra_gpio_resume(void)
}
local_irq_restore(flags);
+ return 0;
}
-void tegra_gpio_suspend(void)
+static int tegra_gpio_suspend(struct device *dev)
{
unsigned long flags;
int b;
@@ -327,14 +348,31 @@ void tegra_gpio_suspend(void)
bank->oe[p] = tegra_gpio_readl(GPIO_OE(gpio));
bank->int_enb[p] = tegra_gpio_readl(GPIO_INT_ENB(gpio));
bank->int_lvl[p] = tegra_gpio_readl(GPIO_INT_LVL(gpio));
+
+ /* Enable gpio irq for wake up source */
+ tegra_gpio_writel(bank->wake_enb[p],
+ GPIO_INT_ENB(gpio));
}
}
local_irq_restore(flags);
+ return 0;
}
-static int tegra_gpio_wake_enable(struct irq_data *d, unsigned int enable)
+static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable)
{
struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d);
+ int gpio = d->hwirq;
+ u32 port, bit, mask;
+
+ port = GPIO_PORT(gpio);
+ bit = GPIO_BIT(gpio);
+ mask = BIT(bit);
+
+ if (enable)
+ bank->wake_enb[port] |= mask;
+ else
+ bank->wake_enb[port] &= ~mask;
+
return irq_set_irq_wake(bank->irq, enable);
}
#endif
@@ -345,11 +383,16 @@ static struct irq_chip tegra_gpio_irq_chip = {
.irq_mask = tegra_gpio_irq_mask,
.irq_unmask = tegra_gpio_irq_unmask,
.irq_set_type = tegra_gpio_irq_set_type,
-#ifdef CONFIG_PM
- .irq_set_wake = tegra_gpio_wake_enable,
+ .irq_shutdown = tegra_gpio_irq_shutdown,
+#ifdef CONFIG_PM_SLEEP
+ .irq_set_wake = tegra_gpio_irq_set_wake,
#endif
};
+static const struct dev_pm_ops tegra_gpio_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume)
+};
+
struct tegra_gpio_soc_config {
u32 bank_stride;
u32 upper_offset;
@@ -365,7 +408,7 @@ static struct tegra_gpio_soc_config tegra30_gpio_config = {
.upper_offset = 0x80,
};
-static struct of_device_id tegra_gpio_of_match[] __devinitdata = {
+static const struct of_device_id tegra_gpio_of_match[] = {
{ .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config },
{ .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config },
{ },
@@ -376,22 +419,25 @@ static struct of_device_id tegra_gpio_of_match[] __devinitdata = {
*/
static struct lock_class_key gpio_lock_class;
-static int __devinit tegra_gpio_probe(struct platform_device *pdev)
+static int tegra_gpio_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
struct tegra_gpio_soc_config *config;
- int irq_base;
struct resource *res;
struct tegra_gpio_bank *bank;
+ int ret;
int gpio;
int i;
int j;
+ dev = &pdev->dev;
+
match = of_match_device(tegra_gpio_of_match, &pdev->dev);
- if (match)
- config = (struct tegra_gpio_soc_config *)match->data;
- else
- config = &tegra20_gpio_config;
+ if (!match) {
+ dev_err(&pdev->dev, "Error: No device match found\n");
+ return -ENODEV;
+ }
+ config = (struct tegra_gpio_soc_config *)match->data;
tegra_gpio_bank_stride = config->bank_stride;
tegra_gpio_upper_offset = config->upper_offset;
@@ -412,19 +458,14 @@ static int __devinit tegra_gpio_probe(struct platform_device *pdev)
tegra_gpio_banks = devm_kzalloc(&pdev->dev,
tegra_gpio_bank_count * sizeof(*tegra_gpio_banks),
GFP_KERNEL);
- if (!tegra_gpio_banks) {
- dev_err(&pdev->dev, "Couldn't allocate bank structure\n");
+ if (!tegra_gpio_banks)
return -ENODEV;
- }
- irq_base = irq_alloc_descs(-1, 0, tegra_gpio_chip.ngpio, 0);
- if (irq_base < 0) {
- dev_err(&pdev->dev, "Couldn't allocate IRQ numbers\n");
- return -ENODEV;
- }
- irq_domain = irq_domain_add_legacy(pdev->dev.of_node,
- tegra_gpio_chip.ngpio, irq_base, 0,
+ irq_domain = irq_domain_add_linear(pdev->dev.of_node,
+ tegra_gpio_chip.ngpio,
&irq_domain_simple_ops, NULL);
+ if (!irq_domain)
+ return -ENODEV;
for (i = 0; i < tegra_gpio_bank_count; i++) {
res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
@@ -439,16 +480,9 @@ static int __devinit tegra_gpio_probe(struct platform_device *pdev)
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!res) {
- dev_err(&pdev->dev, "Missing MEM resource\n");
- return -ENODEV;
- }
-
- regs = devm_request_and_ioremap(&pdev->dev, res);
- if (!regs) {
- dev_err(&pdev->dev, "Couldn't ioremap regs\n");
- return -ENODEV;
- }
+ regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(regs))
+ return PTR_ERR(regs);
for (i = 0; i < tegra_gpio_bank_count; i++) {
for (j = 0; j < 4; j++) {
@@ -457,14 +491,16 @@ static int __devinit tegra_gpio_probe(struct platform_device *pdev)
}
}
-#ifdef CONFIG_OF_GPIO
tegra_gpio_chip.of_node = pdev->dev.of_node;
-#endif
- gpiochip_add(&tegra_gpio_chip);
+ ret = gpiochip_add(&tegra_gpio_chip);
+ if (ret < 0) {
+ irq_domain_remove(irq_domain);
+ return ret;
+ }
for (gpio = 0; gpio < tegra_gpio_chip.ngpio; gpio++) {
- int irq = irq_find_mapping(irq_domain, gpio);
+ int irq = irq_create_mapping(irq_domain, gpio);
/* No validity check; all Tegra GPIOs are valid IRQs */
bank = &tegra_gpio_banks[GPIO_BANK(gpio)];
@@ -493,6 +529,7 @@ static struct platform_driver tegra_gpio_driver = {
.driver = {
.name = "tegra-gpio",
.owner = THIS_MODULE,
+ .pm = &tegra_gpio_pm_ops,
.of_match_table = tegra_gpio_of_match,
},
.probe = tegra_gpio_probe,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 19:18:53 +0000