Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=20118ff97823822bf4d52ccb528ce2b5042c3057
Commit: 20118ff97823822bf4d52ccb528ce2b5042c3057
Parent: 7d77ce8f67358c6b7708726f8fa230cd58d75b2c
Author: Andrew Victor <[EMAIL PROTECTED]>
AuthorDate: Mon Oct 15 14:27:41 2007 +0100
Committer: Russell King <[EMAIL PROTECTED]>
CommitDate: Sat Jan 26 14:38:48 2008 +0000
[ARM] 4603/1: KS8695: debugfs interface to view pin state
This patch adds a debug interface (if CONFIG_DEBUG_FS is selected) to
display the basic configuration and current state of the GPIO pins on
the Kendin/Micrel KS8695 processor.
Signed-off-by: Andrew Victor <[EMAIL PROTECTED]>
Signed-off-by: Russell King <[EMAIL PROTECTED]>
---
arch/arm/mach-ks8695/gpio.c | 83 +++++++++++++++++++++++++++++++
include/asm-arm/arch-ks8695/regs-gpio.h | 2 +
2 files changed, 85 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-ks8695/gpio.c b/arch/arm/mach-ks8695/gpio.c
index b1aa3cb..5e46191 100644
--- a/arch/arm/mach-ks8695/gpio.c
+++ b/arch/arm/mach-ks8695/gpio.c
@@ -20,6 +20,8 @@
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/init.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
#include <linux/module.h>
#include <asm/io.h>
@@ -216,3 +218,84 @@ int irq_to_gpio(unsigned int irq)
return (irq - KS8695_IRQ_EXTERN0);
}
EXPORT_SYMBOL(irq_to_gpio);
+
+
+/* .... Debug interface .....................................................
*/
+
+#ifdef CONFIG_DEBUG_FS
+
+static int ks8695_gpio_show(struct seq_file *s, void *unused)
+{
+ unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN,
IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
+ unsigned int intmask[] = { IOPC_IOEINT0TM, IOPC_IOEINT1TM,
IOPC_IOEINT2TM, IOPC_IOEINT3TM };
+ unsigned long mode, ctrl, data;
+ int i;
+
+ mode = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
+ ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
+ data = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
+
+ seq_printf(s, "Pin\tI/O\tFunction\tState\n\n");
+
+ for (i = KS8695_GPIO_0; i <= KS8695_GPIO_15 ; i++) {
+ seq_printf(s, "%i:\t", i);
+
+ seq_printf(s, "%s\t", (mode & IOPM_(i)) ? "Output" : "Input");
+
+ if (i <= KS8695_GPIO_3) {
+ if (ctrl & enable[i]) {
+ seq_printf(s, "EXT%i ", i);
+
+ switch ((ctrl & intmask[i]) >> (4 * i)) {
+ case IOPC_TM_LOW:
+ seq_printf(s, "(Low)");
break;
+ case IOPC_TM_HIGH:
+ seq_printf(s, "(High)");
break;
+ case IOPC_TM_RISING:
+ seq_printf(s, "(Rising)");
break;
+ case IOPC_TM_FALLING:
+ seq_printf(s, "(Falling)");
break;
+ case IOPC_TM_EDGE:
+ seq_printf(s, "(Edges)");
break;
+ }
+ }
+ else
+ seq_printf(s, "GPIO\t");
+ }
+ else if (i <= KS8695_GPIO_5) {
+ if (ctrl & enable[i])
+ seq_printf(s, "TOUT%i\t", i - KS8695_GPIO_4);
+ else
+ seq_printf(s, "GPIO\t");
+ }
+ else
+ seq_printf(s, "GPIO\t");
+
+ seq_printf(s, "\t");
+
+ seq_printf(s, "%i\n", (data & IOPD_(i)) ? 1 : 0);
+ }
+ return 0;
+}
+
+static int ks8695_gpio_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ks8695_gpio_show, NULL);
+}
+
+static const struct file_operations ks8695_gpio_operations = {
+ .open = ks8695_gpio_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init ks8695_gpio_debugfs_init(void)
+{
+ /* /sys/kernel/debug/ks8695_gpio */
+ (void) debugfs_create_file("ks8695_gpio", S_IFREG | S_IRUGO, NULL,
NULL, &ks8695_gpio_operations);
+ return 0;
+}
+postcore_initcall(ks8695_gpio_debugfs_init);
+
+#endif
diff --git a/include/asm-arm/arch-ks8695/regs-gpio.h
b/include/asm-arm/arch-ks8695/regs-gpio.h
index 57fcf9f..6b95d77 100644
--- a/include/asm-arm/arch-ks8695/regs-gpio.h
+++ b/include/asm-arm/arch-ks8695/regs-gpio.h
@@ -49,5 +49,7 @@
#define IOPC_TM_FALLING (4) /* Falling Edge
Detection */
#define IOPC_TM_EDGE (6) /* Both Edge Detection */
+/* Port Data Register */
+#define IOPD_(x) (1 << (x)) /* Signal Level of GPIO Pin x */
#endif
-
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