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Diffstat (limited to 'arch/arm/plat-orion/gpio.c')
-rw-r--r--arch/arm/plat-orion/gpio.c61
1 files changed, 60 insertions, 1 deletions
diff --git a/arch/arm/plat-orion/gpio.c b/arch/arm/plat-orion/gpio.c
index c29ee7ea200..249fe6333e1 100644
--- a/arch/arm/plat-orion/gpio.c
+++ b/arch/arm/plat-orion/gpio.c
@@ -150,7 +150,7 @@ err_out:
}
/*
- * GENERIC_GPIO primitives.
+ * GPIO primitives.
*/
static int orion_gpio_request(struct gpio_chip *chip, unsigned pin)
{
@@ -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;