diff options
| author | Cyril Chemparathy <cyril@ti.com> | 2010-05-01 18:37:55 -0400 |
|---|---|---|
| committer | Kevin Hilman <khilman@deeprootsystems.com> | 2010-05-06 15:02:09 -0700 |
| commit | b27b6d03f245e5eaf6473da58a2612077fb7cfe7 (patch) | |
| tree | b6ed359c8b604edcaed5025aa83c57d77daec1a9 /arch | |
| parent | 686b634a07451fc4fe3b712fe211bfa861a53241 (diff) | |
| download | op-kernel-dev-b27b6d03f245e5eaf6473da58a2612077fb7cfe7.zip op-kernel-dev-b27b6d03f245e5eaf6473da58a2612077fb7cfe7.tar.gz | |
Davinci: gpio - fine grained locking
This patch eliminates the global gpio_lock, and implements a per-controller
lock instead. This also switches to irqsave/irqrestore locks in case gpios
are manipulated in isr.
Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Tested-by: Sandeep Paulraj <s-paulraj@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-davinci/gpio.c | 9 | ||||
| -rw-r--r-- | arch/arm/mach-davinci/include/mach/gpio.h | 3 |
2 files changed, 8 insertions, 4 deletions
diff --git a/arch/arm/mach-davinci/gpio.c b/arch/arm/mach-davinci/gpio.c index e422cd3..b62d5e2 100644 --- a/arch/arm/mach-davinci/gpio.c +++ b/arch/arm/mach-davinci/gpio.c @@ -33,8 +33,6 @@ struct davinci_gpio_regs { u32 intstat; }; -static DEFINE_SPINLOCK(gpio_lock); - #define chip2controller(chip) \ container_of(chip, struct davinci_gpio_controller, chip) @@ -83,10 +81,11 @@ static inline int __davinci_direction(struct gpio_chip *chip, { struct davinci_gpio_controller *d = chip2controller(chip); struct davinci_gpio_regs __iomem *g = d->regs; + unsigned long flags; u32 temp; u32 mask = 1 << offset; - spin_lock(&gpio_lock); + spin_lock_irqsave(&d->lock, flags); temp = __raw_readl(&g->dir); if (out) { temp &= ~mask; @@ -95,7 +94,7 @@ static inline int __davinci_direction(struct gpio_chip *chip, temp |= mask; } __raw_writel(temp, &g->dir); - spin_unlock(&gpio_lock); + spin_unlock_irqrestore(&d->lock, flags); return 0; } @@ -175,6 +174,8 @@ static int __init davinci_gpio_setup(void) if (chips[i].chip.ngpio > 32) chips[i].chip.ngpio = 32; + spin_lock_init(&chips[i].lock); + regs = gpio2regs(base); chips[i].regs = regs; chips[i].set_data = ®s->set_data; diff --git a/arch/arm/mach-davinci/include/mach/gpio.h b/arch/arm/mach-davinci/include/mach/gpio.h index 9a71a26..504cc18 100644 --- a/arch/arm/mach-davinci/include/mach/gpio.h +++ b/arch/arm/mach-davinci/include/mach/gpio.h @@ -14,6 +14,8 @@ #define __DAVINCI_GPIO_H #include <linux/io.h> +#include <linux/spinlock.h> + #include <asm-generic/gpio.h> #include <mach/irqs.h> @@ -52,6 +54,7 @@ enum davinci_gpio_type { struct davinci_gpio_controller { struct gpio_chip chip; int irq_base; + spinlock_t lock; void __iomem *regs; void __iomem *set_data; void __iomem *clr_data; |
