[PATCH 13/90] ARM: OMAP: /sys/kernel/debug/omap_gpio

Tony Lindgren
2007-04-04T18:07:56Z

From: David Brownell <dbrownell@users.sourceforge.net>

Add some GPIO debug support: /sys/kernel/debug/omap_gpio dumps the state
of all GPIOs that have been claimed, including basic IRQ info if relevant.
Tested on 24xx, 16xx.

Includes minor bugfixes: recording IRQ trigger mode (this should probably
be a genirq patch), adding missing space to non-wakeup warning

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
arch/arm/plat-omap/gpio.c | 130 ++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 129 insertions(+), 1 deletions(-)

diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
index c6cded5..78ba1d3 100644
--- a/arch/arm/plat-omap/gpio.c
+++ b/arch/arm/plat-omap/gpio.c
@@ -536,6 +536,10 @@ static int gpio_irq_type(unsigned irq, unsigned type)
bank = get_gpio_bank(gpio);
spin_lock(&bank->lock);
retval = _set_gpio_triggering(bank, get_gpio_index(gpio), type);
+ if (retval == 0) {
+ irq_desc[irq].status &= ~IRQ_TYPE_SENSE_MASK;
+ irq_desc[irq].status |= type;
+ }
spin_unlock(&bank->lock);
return retval;
}
@@ -702,7 +706,7 @@ static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
spin_lock(&bank->lock);
if (enable) {
if (bank->non_wakeup_gpios & (1 << gpio)) {
- printk(KERN_ERR "Unable to enable wakeup on"
+ printk(KERN_ERR "Unable to enable wakeup on "
"non-wakeup GPIO%d\n",
(bank - gpio_bank) * 32 + gpio);
spin_unlock(&bank->lock);
@@ -1360,3 +1364,127 @@ EXPORT_SYMBOL(omap_set_gpio_dataout);
EXPORT_SYMBOL(omap_get_gpio_datain);

arch_initcall(omap_gpio_sysinit);
+
+
+#ifdef CONFIG_DEBUG_FS
+
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+static int gpio_is_input(struct gpio_bank *bank, int mask)
+{
+ void __iomem *reg = bank->base;
+
+ switch (bank->method) {
+ case METHOD_MPUIO:
+ reg += OMAP_MPUIO_IO_CNTL;
+ break;
+ case METHOD_GPIO_1510:
+ reg += OMAP1510_GPIO_DIR_CONTROL;
+ break;
+ case METHOD_GPIO_1610:
+ reg += OMAP1610_GPIO_DIRECTION;
+ break;
+ case METHOD_GPIO_730:
+ reg += OMAP730_GPIO_DIR_CONTROL;
+ break;
+ case METHOD_GPIO_24XX:
+ reg += OMAP24XX_GPIO_OE;
+ break;
+ }
+ return __raw_readl(reg) & mask;
+}
+
+
+static int dbg_gpio_show(struct seq_file *s, void *unused)
+{
+ unsigned i, j, gpio;
+
+ for (i = 0, gpio = 0; i < gpio_bank_count; i++) {
+ struct gpio_bank *bank = gpio_bank + i;
+ unsigned bankwidth = 16;
+ u32 mask = 1;
+
+ if (!cpu_is_omap24xx() && bank->method == METHOD_MPUIO)
+ gpio = OMAP_MPUIO(0);
+ else if (cpu_is_omap24xx() || cpu_is_omap730())
+ bankwidth = 32;
+
+ for (j = 0; j < bankwidth; j++, gpio++, mask <<= 1) {
+ unsigned irq, value, is_in, irqstat;
+
+ if (!(bank->reserved_map & mask))
+ continue;
+
+ irq = bank->virtual_irq_start + j;
+ value = omap_get_gpio_datain(gpio);
+ is_in = gpio_is_input(bank, mask);
+
+ if (!cpu_is_omap24xx() && bank->method == METHOD_MPUIO)
+ seq_printf(s, "MPUIO %2d: ", j);
+ else
+ seq_printf(s, "GPIO %3d: ", gpio);
+ seq_printf(s, "%s %s",
+ is_in ? "in " : "out",
+ value ? "hi" : "lo");
+
+ irqstat = irq_desc[irq].status;
+ if (is_in && ((bank->suspend_wakeup & mask)
+ || irqstat & IRQ_TYPE_SENSE_MASK)) {
+ char *trigger = NULL;
+
+ switch (irqstat & IRQ_TYPE_SENSE_MASK) {
+ case IRQ_TYPE_EDGE_FALLING:
+ trigger = "falling";
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ trigger = "rising";
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ trigger = "bothedge";
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ trigger = "low";
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ trigger = "high";
+ break;
+ case IRQ_TYPE_NONE:
+ trigger = "(unspecified)";
+ break;
+ }
+ seq_printf(s, ", irq-%d %s%s",
+ irq, trigger,
+ (bank->suspend_wakeup & mask)
+ ? " wakeup" : "");
+ }
+ seq_printf(s, "\n");
+ }
+
+ if (!cpu_is_omap24xx() && bank->method == METHOD_MPUIO) {
+ seq_printf(s, "\n");
+ gpio = 0;
+ }
+ }
+ return 0;
+}
+
+static int dbg_gpio_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, dbg_gpio_show, inode->u.generic_ip/*i_private*/);
+}
+
+static const struct file_operations debug_fops = {
+ .open = dbg_gpio_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init omap_gpio_debuginit(void)
+{
+ (void) debugfs_create_file("omap_gpio", S_IRUGO, NULL, NULL, &debug_fops);
+ return 0;
+}
+late_initcall(omap_gpio_debuginit);
+#endif
--
1.4.4.2