diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/plat-omap/gpio.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c index 4f81ea35b73..055160e0620 100644 --- a/arch/arm/plat-omap/gpio.c +++ b/arch/arm/plat-omap/gpio.c @@ -195,6 +195,7 @@ struct gpio_bank { spinlock_t lock; struct gpio_chip chip; struct clk *dbck; + u32 mod_usage; }; #define METHOD_MPUIO 0 @@ -628,6 +629,10 @@ void omap_set_gpio_debounce(int gpio, int enable) #else reg += OMAP24XX_GPIO_DEBOUNCE_EN; #endif + if (!(bank->mod_usage & l)) { + printk(KERN_ERR "GPIO %d not requested\n", gpio); + return; + } spin_lock_irqsave(&bank->lock, flags); val = __raw_readl(reg); @@ -663,6 +668,11 @@ void omap_set_gpio_debounce_time(int gpio, int enc_time) bank = get_gpio_bank(gpio); reg = bank->base; + if (!bank->mod_usage) { + printk(KERN_ERR "GPIO not requested\n"); + return; + } + enc_time &= 0xff; #ifdef CONFIG_ARCH_OMAP4 reg += OMAP4_GPIO_DEBOUNCINGTIME; @@ -1144,6 +1154,16 @@ static int omap_gpio_request(struct gpio_chip *chip, unsigned offset) __raw_writel(__raw_readl(reg) | (1 << offset), reg); } #endif + if (!cpu_class_is_omap1()) { + if (!bank->mod_usage) { + u32 ctrl; + ctrl = __raw_readl(bank->base + OMAP24XX_GPIO_CTRL); + ctrl &= 0xFFFFFFFE; + /* Module is enabled, clocks are not gated */ + __raw_writel(ctrl, bank->base + OMAP24XX_GPIO_CTRL); + } + bank->mod_usage |= 1 << offset; + } spin_unlock_irqrestore(&bank->lock, flags); return 0; @@ -1170,6 +1190,16 @@ static void omap_gpio_free(struct gpio_chip *chip, unsigned offset) __raw_writel(1 << offset, reg); } #endif + if (!cpu_class_is_omap1()) { + bank->mod_usage &= ~(1 << offset); + if (!bank->mod_usage) { + u32 ctrl; + ctrl = __raw_readl(bank->base + OMAP24XX_GPIO_CTRL); + /* Module is disabled, clocks are gated */ + ctrl |= 1; + __raw_writel(ctrl, bank->base + OMAP24XX_GPIO_CTRL); + } + } _reset_gpio(bank, bank->chip.base + offset); spin_unlock_irqrestore(&bank->lock, flags); } @@ -1749,6 +1779,8 @@ static int __init _omap_gpio_init(void) gpio_count = 32; } #endif + + bank->mod_usage = 0; /* REVISIT eventually switch from OMAP-specific gpio structs * over to the generic ones */ |