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authorEric Biederman <ebiederm@xmission.com>2004-11-11 11:56:00 +0000
committerEric Biederman <ebiederm@xmission.com>2004-11-11 11:56:00 +0000
commit029517c77a1d756ccbb196b5178ba2a1cf952c97 (patch)
treee8be0af88fe9fcaf2f3ae9b47ee98d8dcd68b99f /src/pc80/keyboard.c
parent69afe2822a960c1d2b0c84854ea6a2cd1eec29f9 (diff)
downloadcoreboot-029517c77a1d756ccbb196b5178ba2a1cf952c97.tar.xz
- Refactor the pc keyboard code so it will timeout if the hardware
is not working instead of haning forever. git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1779 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/pc80/keyboard.c')
-rw-r--r--src/pc80/keyboard.c50
1 files changed, 35 insertions, 15 deletions
diff --git a/src/pc80/keyboard.c b/src/pc80/keyboard.c
index d293f714de..f46d1ffa16 100644
--- a/src/pc80/keyboard.c
+++ b/src/pc80/keyboard.c
@@ -3,21 +3,45 @@
#include <device/device.h>
#include <arch/io.h>
+static int kbd_empty_input_buffer(void)
+{
+ unsigned long timeout;
+ for(timeout = 1000000; timeout && (inb(0x64) & 0x02); timeout--) {
+ post_code(0);
+ }
+ return !!timeout;
+}
+
+static int kbd_empty_output_buffer(void)
+{
+ unsigned long timeout;
+ for(timeout = 1000000; timeout && ((inb(0x64) & 0x01) == 0); timeout--) {
+ post_code(0);
+ }
+ return !!timeout;
+}
+
/* much better keyboard init courtesy ollie@sis.com.tw
TODO: Typematic Setting, the keyboard is too slow for me */
static void pc_keyboard_init(struct pc_keyboard *keyboard)
{
- volatile unsigned char regval;
+ unsigned char regval;
+ unsigned long timeout;
/* send cmd = 0xAA, self test 8042 */
outb(0xaa, 0x64);
/* empty input buffer or any other command/data will be lost */
- while ((inb(0x64) & 0x02))
- post_code(0);
+ if (!kbd_empty_input_buffer()) {
+ printk_err("Keyboard input buffer would not empty\n");
+ return;
+ }
+
/* empty output buffer or any other command/data will be lost */
- while ((inb(0x64) & 0x01) == 0)
- post_code(1);
+ if (!kbd_empty_output_buffer()) {
+ printk_err("Keyboard output buffer would not empty\n");
+ return;
+ }
/* read self-test result, 0x55 should be returned form 0x60 */
if ((regval = inb(0x60) != 0x55))
@@ -25,29 +49,25 @@ static void pc_keyboard_init(struct pc_keyboard *keyboard)
/* enable keyboard interface */
outb(0x60, 0x64);
- while ((inb(0x64) & 0x02))
- post_code(2);
+ kbd_empty_input_buffer();
/* send cmd: enable IRQ 1 */
outb(0x61, 0x60);
- while ((inb(0x64) & 0x02))
- post_code(3);
+ kbd_empty_input_buffer();
/* reset kerboard and self test (keyboard side) */
outb(0xff, 0x60);
/* empty inut bufferm or any other command/data will be lost */
- while ((inb(0x64) & 0x02))
- post_code(4);
+ kbd_empty_input_buffer();
+
/* empty output buffer or any other command/data will be lost */
- while ((inb(0x64) & 0x01) == 0)
- post_code(5);
+ kbd_empty_output_buffer();
if ((regval = inb(0x60) != 0xfa))
return;
- while ((inb(0x64) & 0x01) == 0)
- post_code(6);
+ kbd_empty_output_buffer();
if ((regval = inb(0x60) != 0xaa))
return;
}