diff options
| -rw-r--r-- | drivers/gpio/gpio-mvebu.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c index 474823e403fa..f7db3b336343 100644 --- a/drivers/gpio/gpio-mvebu.c +++ b/drivers/gpio/gpio-mvebu.c @@ -469,6 +469,64 @@ static void mvebu_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) } } +#ifdef CONFIG_DEBUG_FS +#include <linux/seq_file.h> + +static void mvebu_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) +{ + struct mvebu_gpio_chip *mvchip = + container_of(chip, struct mvebu_gpio_chip, chip); + u32 out, io_conf, blink, in_pol, data_in, cause, edg_msk, lvl_msk; + int i; + + out = readl_relaxed(mvebu_gpioreg_out(mvchip)); + io_conf = readl_relaxed(mvebu_gpioreg_io_conf(mvchip)); + blink = readl_relaxed(mvebu_gpioreg_blink(mvchip)); + in_pol = readl_relaxed(mvebu_gpioreg_in_pol(mvchip)); + data_in = readl_relaxed(mvebu_gpioreg_data_in(mvchip)); + cause = readl_relaxed(mvebu_gpioreg_edge_cause(mvchip)); + edg_msk = readl_relaxed(mvebu_gpioreg_edge_mask(mvchip)); + lvl_msk = readl_relaxed(mvebu_gpioreg_level_mask(mvchip)); + + 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 mvebu_gpio_dbg_show NULL +#endif + static struct of_device_id mvebu_gpio_of_match[] = { { .compatible = "marvell,orion-gpio", @@ -543,6 +601,7 @@ static int mvebu_gpio_probe(struct platform_device *pdev) mvchip->chip.ngpio = ngpios; mvchip->chip.can_sleep = 0; mvchip->chip.of_node = np; + mvchip->chip.dbg_show = mvebu_gpio_dbg_show; spin_lock_init(&mvchip->lock); mvchip->membase = devm_ioremap_resource(&pdev->dev, res); |