diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-21 15:40:55 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-21 15:40:55 -0700 |
commit | 85b375a613085b78531ec86369a51c2f3b922f95 (patch) | |
tree | 716437d598de92bbd7acaf24622e9a7d74fc209a /arch/arm/plat-omap/gpio.c | |
parent | ec965350bb98bd291eb34f6ecddfdcfc36da1e6e (diff) | |
parent | cf816ecb533ab96b883dfdc0db174598b5b5c4d2 (diff) |
Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (212 commits)
[ARM] pxa: Phycore pcm-990-specific code for the PXA270 Quick Capture driver
[ARM] pxa: V4L2 soc_camera driver for PXA270
[ARM] pxa: restrict availability of pxa2xx PCMCIA drivers
[ARM] 5005/1: BAST: Fix kset_name initialiser
[ARM] 4967/1: Adds functions to set clkout rate for Samsung S3C2410
[ARM] 4988/1: Add GPIO lib support to the EP93xx
[ARM] Add initial sparsemem support
[ARM] pxa: initialise PXA devices before platform init code
[ARM] 5002/1: tosa: add two more leds
[ARM] 5004/1: Tosa: make several unreferenced structures static.
[ARM] 5003/1: Shut up sparse warnings
[ARM] 4977/2: soc - pxa2xx-ac97 - Add missing clk_enable()
[ARM] 4976/1: zylonite: Configure GPIO for WM9713 IRQ line
[ARM] 4974/1: Drop unused leds-tosa.
[ARM] 4973/1: Tosa: use leds-gpio driver.
[ARM] 4972/1: Tosa: convert scoop GPIOs usage to generic gpio code
[ARM] 4971/1: pxaficp_ir: provide startup and shutdown hooks
[ARM] pxa: lubbock: move mis-placed SPI info
[ARM] 4970/1: tosa: correct gpio used for wake up.
[ARM] 4966/1: magician: add MFP pin configuration
...
Diffstat (limited to 'arch/arm/plat-omap/gpio.c')
-rw-r--r-- | arch/arm/plat-omap/gpio.c | 176 |
1 files changed, 109 insertions, 67 deletions
diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c index 8c78e4e57b5..1903a3491ee 100644 --- a/arch/arm/plat-omap/gpio.c +++ b/arch/arm/plat-omap/gpio.c @@ -136,7 +136,6 @@ struct gpio_bank { u16 irq; u16 virtual_irq_start; int method; - u32 reserved_map; #if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP24XX) || defined(CONFIG_ARCH_OMAP34XX) u32 suspend_wakeup; u32 saved_wakeup; @@ -149,7 +148,9 @@ struct gpio_bank { u32 saved_fallingdetect; u32 saved_risingdetect; #endif + u32 level_mask; spinlock_t lock; + struct gpio_chip chip; }; #define METHOD_MPUIO 0 @@ -538,10 +539,9 @@ static inline void set_24xx_gpio_triggering(struct gpio_bank *bank, int gpio, bank->enabled_non_wakeup_gpios &= ~gpio_bit; } - /* - * FIXME: Possibly do 'set_irq_handler(j, handle_level_irq)' if only - * level triggering requested. - */ + bank->level_mask = + __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0) | + __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1); } #endif @@ -652,6 +652,12 @@ static int gpio_irq_type(unsigned irq, unsigned type) irq_desc[irq].status |= type; } spin_unlock_irqrestore(&bank->lock, flags); + + if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) + __set_irq_handler_unlocked(irq, handle_level_irq); + else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) + __set_irq_handler_unlocked(irq, handle_edge_irq); + return retval; } @@ -903,19 +909,17 @@ int omap_request_gpio(int gpio) { struct gpio_bank *bank; unsigned long flags; + int status; if (check_gpio(gpio) < 0) return -EINVAL; + status = gpio_request(gpio, NULL); + if (status < 0) + return status; + bank = get_gpio_bank(gpio); spin_lock_irqsave(&bank->lock, flags); - if (unlikely(bank->reserved_map & (1 << get_gpio_index(gpio)))) { - printk(KERN_ERR "omap-gpio: GPIO %d is already reserved!\n", gpio); - dump_stack(); - spin_unlock_irqrestore(&bank->lock, flags); - return -1; - } - bank->reserved_map |= (1 << get_gpio_index(gpio)); /* Set trigger to none. You need to enable the desired trigger with * request_irq() or set_irq_type(). @@ -945,10 +949,11 @@ void omap_free_gpio(int gpio) return; bank = get_gpio_bank(gpio); spin_lock_irqsave(&bank->lock, flags); - if (unlikely(!(bank->reserved_map & (1 << get_gpio_index(gpio))))) { + if (unlikely(!gpiochip_is_requested(&bank->chip, + get_gpio_index(gpio)))) { + spin_unlock_irqrestore(&bank->lock, flags); printk(KERN_ERR "omap-gpio: GPIO %d wasn't reserved!\n", gpio); dump_stack(); - spin_unlock_irqrestore(&bank->lock, flags); return; } #ifdef CONFIG_ARCH_OMAP16XX @@ -965,9 +970,9 @@ void omap_free_gpio(int gpio) __raw_writel(1 << get_gpio_index(gpio), reg); } #endif - bank->reserved_map &= ~(1 << get_gpio_index(gpio)); _reset_gpio(bank, gpio); spin_unlock_irqrestore(&bank->lock, flags); + gpio_free(gpio); } /* @@ -1022,12 +1027,7 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc) isr &= 0x0000ffff; if (cpu_class_is_omap2()) { - level_mask = - __raw_readl(bank->base + - OMAP24XX_GPIO_LEVELDETECT0) | - __raw_readl(bank->base + - OMAP24XX_GPIO_LEVELDETECT1); - level_mask &= enabled; + level_mask = bank->level_mask & enabled; } /* clear edge sensitive interrupts before handler(s) are @@ -1052,51 +1052,13 @@ static void gpio_irq_handler(unsigned int irq, struct irq_desc *desc) gpio_irq = bank->virtual_irq_start; for (; isr != 0; isr >>= 1, gpio_irq++) { struct irq_desc *d; - int irq_mask; + if (!(isr & 1)) continue; d = irq_desc + gpio_irq; - /* Don't run the handler if it's already running - * or was disabled lazely. - */ - if (unlikely((d->depth || - (d->status & IRQ_INPROGRESS)))) { - irq_mask = 1 << - (gpio_irq - bank->virtual_irq_start); - /* The unmasking will be done by - * enable_irq in case it is disabled or - * after returning from the handler if - * it's already running. - */ - _enable_gpio_irqbank(bank, irq_mask, 0); - if (!d->depth) { - /* Level triggered interrupts - * won't ever be reentered - */ - BUG_ON(level_mask & irq_mask); - d->status |= IRQ_PENDING; - } - continue; - } desc_handle_irq(gpio_irq, d); - - if (unlikely((d->status & IRQ_PENDING) && !d->depth)) { - irq_mask = 1 << - (gpio_irq - bank->virtual_irq_start); - d->status &= ~IRQ_PENDING; - _enable_gpio_irqbank(bank, irq_mask, 1); - retrigger |= irq_mask; - } } - - if (cpu_class_is_omap2()) { - /* clear level sensitive interrupts after handler(s) */ - _enable_gpio_irqbank(bank, isr_saved & level_mask, 0); - _clear_gpio_irqbank(bank, isr_saved & level_mask); - _enable_gpio_irqbank(bank, isr_saved & level_mask, 1); - } - } /* if bank has any level sensitive GPIO pin interrupt configured, we must unmask the bank interrupt only after @@ -1135,6 +1097,14 @@ static void gpio_unmask_irq(unsigned int irq) { unsigned int gpio = irq - IH_GPIO_BASE; struct gpio_bank *bank = get_irq_chip_data(irq); + unsigned int irq_mask = 1 << get_gpio_index(gpio); + + /* For level-triggered GPIOs, the clearing must be done after + * the HW source is cleared, thus after the handler has run */ + if (bank->level_mask & irq_mask) { + _set_gpio_irqenable(bank, gpio, 0); + _clear_gpio_irqstatus(bank, gpio); + } _set_gpio_irqenable(bank, gpio, 1); } @@ -1266,6 +1236,53 @@ static inline void mpuio_init(void) {} /*---------------------------------------------------------------------*/ +/* REVISIT these are stupid implementations! replace by ones that + * don't switch on METHOD_* and which mostly avoid spinlocks + */ + +static int gpio_input(struct gpio_chip *chip, unsigned offset) +{ + struct gpio_bank *bank; + unsigned long flags; + + bank = container_of(chip, struct gpio_bank, chip); + spin_lock_irqsave(&bank->lock, flags); + _set_gpio_direction(bank, offset, 1); + spin_unlock_irqrestore(&bank->lock, flags); + return 0; +} + +static int gpio_get(struct gpio_chip *chip, unsigned offset) +{ + return omap_get_gpio_datain(chip->base + offset); +} + +static int gpio_output(struct gpio_chip *chip, unsigned offset, int value) +{ + struct gpio_bank *bank; + unsigned long flags; + + bank = container_of(chip, struct gpio_bank, chip); + spin_lock_irqsave(&bank->lock, flags); + _set_gpio_dataout(bank, offset, value); + _set_gpio_direction(bank, offset, 0); + spin_unlock_irqrestore(&bank->lock, flags); + return 0; +} + +static void gpio_set(struct gpio_chip *chip, unsigned offset, int value) +{ + struct gpio_bank *bank; + unsigned long flags; + + bank = container_of(chip, struct gpio_bank, chip); + spin_lock_irqsave(&bank->lock, flags); + _set_gpio_dataout(bank, offset, value); + spin_unlock_irqrestore(&bank->lock, flags); +} + +/*---------------------------------------------------------------------*/ + static int initialized; #if !defined(CONFIG_ARCH_OMAP3) static struct clk * gpio_ick; @@ -1293,6 +1310,7 @@ static struct lock_class_key gpio_lock_class; static int __init _omap_gpio_init(void) { int i; + int gpio = 0; struct gpio_bank *bank; #if defined(CONFIG_ARCH_OMAP3) char clk_name[11]; @@ -1423,7 +1441,6 @@ static int __init _omap_gpio_init(void) int j, gpio_count = 16; bank = &gpio_bank[i]; - bank->reserved_map = 0; bank->base = IO_ADDRESS(bank->base); spin_lock_init(&bank->lock); if (bank_is_mpuio(bank)) @@ -1461,6 +1478,26 @@ static int __init _omap_gpio_init(void) gpio_count = 32; } #endif + + /* REVISIT eventually switch from OMAP-specific gpio structs + * over to the generic ones + */ + bank->chip.direction_input = gpio_input; + bank->chip.get = gpio_get; + bank->chip.direction_output = gpio_output; + bank->chip.set = gpio_set; + if (bank_is_mpuio(bank)) { + bank->chip.label = "mpuio"; + bank->chip.base = OMAP_MPUIO(0); + } else { + bank->chip.label = "gpio"; + bank->chip.base = gpio; + gpio += gpio_count; + } + bank->chip.ngpio = gpio_count; + + gpiochip_add(&bank->chip); + for (j = bank->virtual_irq_start; j < bank->virtual_irq_start + gpio_count; j++) { lockdep_set_class(&irq_desc[j].lock, &gpio_lock_class); @@ -1757,8 +1794,10 @@ static int dbg_gpio_show(struct seq_file *s, void *unused) for (j = 0; j < bankwidth; j++, gpio++, mask <<= 1) { unsigned irq, value, is_in, irqstat; + const char *label; - if (!(bank->reserved_map & mask)) + label = gpiochip_is_requested(&bank->chip, j); + if (!label) continue; irq = bank->virtual_irq_start + j; @@ -1766,13 +1805,16 @@ static int dbg_gpio_show(struct seq_file *s, void *unused) is_in = gpio_is_input(bank, mask); if (bank_is_mpuio(bank)) - seq_printf(s, "MPUIO %2d: ", j); + seq_printf(s, "MPUIO %2d ", j); else - seq_printf(s, "GPIO %3d: ", gpio); - seq_printf(s, "%s %s", + seq_printf(s, "GPIO %3d ", gpio); + seq_printf(s, "(%10s): %s %s", + label, is_in ? "in " : "out", value ? "hi" : "lo"); +/* FIXME for at least omap2, show pullup/pulldown state */ + irqstat = irq_desc[irq].status; if (is_in && ((bank->suspend_wakeup & mask) || irqstat & IRQ_TYPE_SENSE_MASK)) { @@ -1795,10 +1837,10 @@ static int dbg_gpio_show(struct seq_file *s, void *unused) trigger = "high"; break; case IRQ_TYPE_NONE: - trigger = "(unspecified)"; + trigger = "(?)"; break; } - seq_printf(s, ", irq-%d %s%s", + seq_printf(s, ", irq-%d %-8s%s", irq, trigger, (bank->suspend_wakeup & mask) ? " wakeup" : ""); |