From 647f8d94a4e69d39e88a617846755655853c20f5 Mon Sep 17 00:00:00 2001 From: Ludovic Desroches Date: Fri, 8 Mar 2013 16:18:21 +0100 Subject: [PATCH] ARM: at91: add gpio suspend/resume support when using pinctrl gpio suspend/resume and wakeup sources where not managed when using pinctrl so it was impossible to wake up the system with a gpio. Signed-off-by: Ludovic Desroches Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD Acked-by: Linus Walleij Signed-off-by: Nicolas Ferre --- arch/arm/mach-at91/include/mach/gpio.h | 8 ++++ arch/arm/mach-at91/pm.c | 10 ++++- drivers/pinctrl/pinctrl-at91.c | 61 +++++++++++++++++++++++++- 3 files changed, 76 insertions(+), 3 deletions(-) diff --git a/arch/arm/mach-at91/include/mach/gpio.h b/arch/arm/mach-at91/include/mach/gpio.h index eed465ab0dd7..5fc23771c154 100644 --- a/arch/arm/mach-at91/include/mach/gpio.h +++ b/arch/arm/mach-at91/include/mach/gpio.h @@ -209,6 +209,14 @@ extern int at91_get_gpio_value(unsigned pin); extern void at91_gpio_suspend(void); extern void at91_gpio_resume(void); +#ifdef CONFIG_PINCTRL_AT91 +extern void at91_pinctrl_gpio_suspend(void); +extern void at91_pinctrl_gpio_resume(void); +#else +static inline void at91_pinctrl_gpio_suspend(void) {} +static inline void at91_pinctrl_gpio_resume(void) {} +#endif + #endif /* __ASSEMBLY__ */ #endif diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c index adb6db888a1f..73f1f250403a 100644 --- a/arch/arm/mach-at91/pm.c +++ b/arch/arm/mach-at91/pm.c @@ -201,7 +201,10 @@ extern u32 at91_slow_clock_sz; static int at91_pm_enter(suspend_state_t state) { - at91_gpio_suspend(); + if (of_have_populated_dt()) + at91_pinctrl_gpio_suspend(); + else + at91_gpio_suspend(); at91_irq_suspend(); pr_debug("AT91: PM - wake mask %08x, pm state %d\n", @@ -286,7 +289,10 @@ static int at91_pm_enter(suspend_state_t state) error: target_state = PM_SUSPEND_ON; at91_irq_resume(); - at91_gpio_resume(); + if (of_have_populated_dt()) + at91_pinctrl_gpio_resume(); + else + at91_gpio_resume(); return 0; } diff --git a/drivers/pinctrl/pinctrl-at91.c b/drivers/pinctrl/pinctrl-at91.c index 75933a6aa828..efb7f10e902a 100644 --- a/drivers/pinctrl/pinctrl-at91.c +++ b/drivers/pinctrl/pinctrl-at91.c @@ -1277,21 +1277,80 @@ static int alt_gpio_irq_type(struct irq_data *d, unsigned type) } #ifdef CONFIG_PM + +static u32 wakeups[MAX_GPIO_BANKS]; +static u32 backups[MAX_GPIO_BANKS]; + static int gpio_irq_set_wake(struct irq_data *d, unsigned state) { struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(d); unsigned bank = at91_gpio->pioc_idx; + unsigned mask = 1 << d->hwirq; if (unlikely(bank >= MAX_GPIO_BANKS)) return -EINVAL; + if (state) + wakeups[bank] |= mask; + else + wakeups[bank] &= ~mask; + irq_set_irq_wake(at91_gpio->pioc_virq, state); return 0; } + +void at91_pinctrl_gpio_suspend(void) +{ + int i; + + for (i = 0; i < gpio_banks; i++) { + void __iomem *pio; + + if (!gpio_chips[i]) + continue; + + pio = gpio_chips[i]->regbase; + + backups[i] = __raw_readl(pio + PIO_IMR); + __raw_writel(backups[i], pio + PIO_IDR); + __raw_writel(wakeups[i], pio + PIO_IER); + + if (!wakeups[i]) { + clk_unprepare(gpio_chips[i]->clock); + clk_disable(gpio_chips[i]->clock); + } else { + printk(KERN_DEBUG "GPIO-%c may wake for %08x\n", + 'A'+i, wakeups[i]); + } + } +} + +void at91_pinctrl_gpio_resume(void) +{ + int i; + + for (i = 0; i < gpio_banks; i++) { + void __iomem *pio; + + if (!gpio_chips[i]) + continue; + + pio = gpio_chips[i]->regbase; + + if (!wakeups[i]) { + if (clk_prepare(gpio_chips[i]->clock) == 0) + clk_enable(gpio_chips[i]->clock); + } + + __raw_writel(wakeups[i], pio + PIO_IDR); + __raw_writel(backups[i], pio + PIO_IER); + } +} + #else #define gpio_irq_set_wake NULL -#endif +#endif /* CONFIG_PM */ static struct irq_chip gpio_irqchip = { .name = "GPIO",