diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pinctrl/pinctrl-at91-pio4.c | 76 |
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, |