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gpio: mvebu: add dbg_show function

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This patch adds a dedicated dbg_show function to the gpio-mvebu driver.
In addition to the generic gpiolib informations, this function displays
informations related with the specific Marvell registers (blink enable,
data in polarity, interrupt masks and cause).

Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Simon Guinot 2013-03-24 15:45:29 +01:00 committed by Linus Walleij
parent 047b93a359
commit a4ba5e1b92
1 changed files with 59 additions and 0 deletions
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59
drivers/gpio/gpio-mvebu.c
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@ -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);