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ARM: Orion: add dbg_show function to gpio-orion driver

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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: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Simon Guinot 2013-03-24 15:45:30 +01:00 committed by Jason Cooper
parent 8bb9660418
commit 8d00748873
1 changed files with 59 additions and 0 deletions
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59
arch/arm/plat-orion/gpio.c
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@ -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;