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authorLudovic Desroches <ludovic.desroches@atmel.com>2015-09-25 11:14:09 +0200
committerLinus Walleij <linus.walleij@linaro.org>2015-10-02 05:02:37 -0700
commitde4e882f3fbef586304837518c424787bdfca8b8 (patch)
tree7bc0855b08fa4b63d4ec939aaba08d2a361fbaf0 /drivers/pinctrl
parent4730f33f0d822fd8d0f5d2229793a5df674fed5c (diff)
downloadlinux-de4e882f3fbef586304837518c424787bdfca8b8.tar.bz2
pinctrl: at91-pio4: add PM stuff
Allow GPIOs to be configured as wakeup sources. When going to suspend, disable all GPIO irqs excepting the one configured as wakeup sources. Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r--drivers/pinctrl/pinctrl-at91-pio4.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-at91-pio4.c b/drivers/pinctrl/pinctrl-at91-pio4.c
index 6aff632aaa46..5e2189f17fe1 100644
--- a/drivers/pinctrl/pinctrl-at91-pio4.c
+++ b/drivers/pinctrl/pinctrl-at91-pio4.c
@@ -16,6 +16,7 @@
#include <linux/clk.h>
#include <linux/gpio.h>
+#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
@@ -122,6 +123,8 @@ struct atmel_pioctrl {
struct gpio_chip *gpio_chip;
struct irq_domain *irq_domain;
int *irqs;
+ unsigned *pm_wakeup_sources;
+ unsigned *pm_suspend_backup;
struct device *dev;
struct device_node *node;
};
@@ -214,12 +217,35 @@ static void atmel_gpio_irq_unmask(struct irq_data *d)
BIT(pin->line));
}
+#ifdef CONFIG_PM_SLEEP
+
+static int atmel_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
+{
+ struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
+ int bank = ATMEL_PIO_BANK(d->hwirq);
+ int line = ATMEL_PIO_LINE(d->hwirq);
+
+ /* The gpio controller has one interrupt line per bank. */
+ irq_set_irq_wake(atmel_pioctrl->irqs[bank], on);
+
+ if (on)
+ atmel_pioctrl->pm_wakeup_sources[bank] |= BIT(line);
+ else
+ atmel_pioctrl->pm_wakeup_sources[bank] &= ~(BIT(line));
+
+ return 0;
+}
+#else
+#define atmel_gpio_irq_set_wake NULL
+#endif /* CONFIG_PM_SLEEP */
+
static struct irq_chip atmel_gpio_irq_chip = {
.name = "GPIO",
.irq_ack = atmel_gpio_irq_ack,
.irq_mask = atmel_gpio_irq_mask,
.irq_unmask = atmel_gpio_irq_unmask,
.irq_set_type = atmel_gpio_irq_set_type,
+ .irq_set_wake = atmel_gpio_irq_set_wake,
};
static void atmel_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
@@ -792,6 +818,43 @@ static struct pinctrl_desc atmel_pinctrl_desc = {
.pmxops = &atmel_pmxops,
};
+static int atmel_pctrl_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
+ int i;
+
+ /*
+ * For each bank, save IMR to restore it later and disable all GPIO
+ * interrupts excepting the ones marked as wakeup sources.
+ */
+ for (i = 0; i < atmel_pioctrl->nbanks; i++) {
+ atmel_pioctrl->pm_suspend_backup[i] =
+ atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR);
+ atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR,
+ ~atmel_pioctrl->pm_wakeup_sources[i]);
+ }
+
+ return 0;
+}
+
+static int atmel_pctrl_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct atmel_pioctrl *atmel_pioctrl = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < atmel_pioctrl->nbanks; i++)
+ atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER,
+ atmel_pioctrl->pm_suspend_backup[i]);
+
+ return 0;
+}
+
+static const struct dev_pm_ops atmel_pctrl_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(atmel_pctrl_suspend, atmel_pctrl_resume)
+};
+
/*
* The number of banks can be different from a SoC to another one.
* We can have up to 16 banks.
@@ -908,6 +971,18 @@ static int atmel_pinctrl_probe(struct platform_device *pdev)
atmel_pioctrl->gpio_chip->dev = dev;
atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names;
+ atmel_pioctrl->pm_wakeup_sources = devm_kzalloc(dev,
+ sizeof(*atmel_pioctrl->pm_wakeup_sources)
+ * atmel_pioctrl->nbanks, GFP_KERNEL);
+ if (!atmel_pioctrl->pm_wakeup_sources)
+ return -ENOMEM;
+
+ atmel_pioctrl->pm_suspend_backup = devm_kzalloc(dev,
+ sizeof(*atmel_pioctrl->pm_suspend_backup)
+ * atmel_pioctrl->nbanks, GFP_KERNEL);
+ if (!atmel_pioctrl->pm_suspend_backup)
+ return -ENOMEM;
+
atmel_pioctrl->irqs = devm_kzalloc(dev, sizeof(*atmel_pioctrl->irqs)
* atmel_pioctrl->nbanks, GFP_KERNEL);
if (!atmel_pioctrl->irqs)
@@ -1006,6 +1081,7 @@ static struct platform_driver atmel_pinctrl_driver = {
.driver = {
.name = "pinctrl-at91-pio4",
.of_match_table = atmel_pctrl_of_match,
+ .pm = &atmel_pctrl_pm_ops,
},
.probe = atmel_pinctrl_probe,
.remove = atmel_pinctrl_remove,