diff options
Diffstat (limited to 'arch/arm/mach-at91/gpio.c')
-rw-r--r-- | arch/arm/mach-at91/gpio.c | 69 |
1 files changed, 65 insertions, 4 deletions
diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c index 028e4f7..f2236f0 100644 --- a/arch/arm/mach-at91/gpio.c +++ b/arch/arm/mach-at91/gpio.c @@ -437,7 +437,68 @@ static void gpio_irq_handler(unsigned irq, struct irq_desc *desc) /*--------------------------------------------------------------------------*/ -/* This lock class tells lockdep that GPIO irqs are in a different +#ifdef CONFIG_DEBUG_FS + +static int at91_gpio_show(struct seq_file *s, void *unused) +{ + int bank, j; + + /* print heading */ + seq_printf(s, "Pin\t"); + for (bank = 0; bank < gpio_banks; bank++) { + seq_printf(s, "PIO%c\t", 'A' + bank); + }; + seq_printf(s, "\n\n"); + + /* print pin status */ + for (j = 0; j < 32; j++) { + seq_printf(s, "%i:\t", j); + + for (bank = 0; bank < gpio_banks; bank++) { + unsigned pin = PIN_BASE + (32 * bank) + j; + void __iomem *pio = pin_to_controller(pin); + unsigned mask = pin_to_mask(pin); + + if (__raw_readl(pio + PIO_PSR) & mask) + seq_printf(s, "GPIO:%s", __raw_readl(pio + PIO_PDSR) & mask ? "1" : "0"); + else + seq_printf(s, "%s", __raw_readl(pio + PIO_ABSR) & mask ? "B" : "A"); + + seq_printf(s, "\t"); + } + + seq_printf(s, "\n"); + } + + return 0; +} + +static int at91_gpio_open(struct inode *inode, struct file *file) +{ + return single_open(file, at91_gpio_show, NULL); +} + +static const struct file_operations at91_gpio_operations = { + .open = at91_gpio_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int __init at91_gpio_debugfs_init(void) +{ + /* /sys/kernel/debug/at91_gpio */ + (void) debugfs_create_file("at91_gpio", S_IFREG | S_IRUGO, NULL, NULL, &at91_gpio_operations); + return 0; +} +postcore_initcall(at91_gpio_debugfs_init); + +#endif + +/*--------------------------------------------------------------------------*/ + +/* + * This lock class tells lockdep that GPIO irqs are in a different * category than their parents, so it won't report false recursion. */ static struct lock_class_key gpio_lock_class; @@ -456,9 +517,6 @@ void __init at91_gpio_irq_setup(void) unsigned id = this->bank->id; unsigned i; - /* enable PIO controller's clock */ - clk_enable(this->bank->clock); - __raw_writel(~0, this->regbase + PIO_IDR); for (i = 0, pin = this->chip.base; i < 32; i++, pin++) { @@ -589,6 +647,9 @@ void __init at91_gpio_init(struct at91_gpio_bank *data, int nr_banks) at91_gpio->regbase = at91_gpio->bank->offset + (void __iomem *)AT91_VA_BASE_SYS; + /* enable PIO controller's clock */ + clk_enable(at91_gpio->bank->clock); + /* AT91SAM9263_ID_PIOCDE groups PIOC, PIOD, PIOE */ if (last && last->bank->id == at91_gpio->bank->id) last->next = at91_gpio; |