diff options
| -rw-r--r-- | arch/arm/plat-orion/gpio.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/arm/plat-orion/gpio.c b/arch/arm/plat-orion/gpio.c index c29ee7ea200..e39c2ba6e2f 100644 --- a/arch/arm/plat-orion/gpio.c +++ b/arch/arm/plat-orion/gpio.c @@ -439,6 +439,64 @@ static void gpio_irq_handler(unsigned irq, struct irq_desc *desc) } } +#ifdef CONFIG_DEBUG_FS +#include <linux/seq_file.h> + +static void orion_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) +{ + struct orion_gpio_chip *ochip = + container_of(chip, struct orion_gpio_chip, chip); + u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk; + int i; + + out = readl_relaxed(GPIO_OUT(ochip)); + io_conf = readl_relaxed(GPIO_IO_CONF(ochip)); + blink = readl_relaxed(GPIO_BLINK_EN(ochip)); + in_pol = readl_relaxed(GPIO_IN_POL(ochip)); + data_in = readl_relaxed(GPIO_DATA_IN(ochip)); + cause = readl_relaxed(GPIO_EDGE_CAUSE(ochip)); + edg_msk = readl_relaxed(GPIO_EDGE_MASK(ochip)); + lvl_msk = readl_relaxed(GPIO_LEVEL_MASK(ochip)); + + for (i = 0; i < chip->ngpio; i++) { + const char *label; + u32 msk; + bool is_out; + + label = gpiochip_is_requested(chip, i); + if (!label) + continue; + + msk = 1 << i; + is_out = !(io_conf & msk); + + seq_printf(s, " gpio-%-3d (%-20.20s)", chip->base + i, label); + + if (is_out) { + seq_printf(s, " out %s %s\n", + out & msk ? "hi" : "lo", + blink & msk ? "(blink )" : ""); + continue; + } + + seq_printf(s, " in %s (act %s) - IRQ", + (data_in ^ in_pol) & msk ? "hi" : "lo", + in_pol & msk ? "lo" : "hi"); + if (!((edg_msk | lvl_msk) & msk)) { + seq_printf(s, " disabled\n"); + continue; + } + if (edg_msk & msk) + seq_printf(s, " edge "); + if (lvl_msk & msk) + seq_printf(s, " level"); + seq_printf(s, " (%s)\n", cause & msk ? "pending" : "clear "); + } +} +#else +#define orion_gpio_dbg_show NULL +#endif + void __init orion_gpio_init(struct device_node *np, int gpio_base, int ngpio, void __iomem *base, int mask_offset, @@ -471,6 +529,7 @@ void __init orion_gpio_init(struct device_node *np, #ifdef CONFIG_OF ochip->chip.of_node = np; #endif + ochip->chip.dbg_show = orion_gpio_dbg_show; spin_lock_init(&ochip->lock); ochip->base = (void __iomem *)base; |