Author: stepan
Date: 2009-10-24 20:15:07 +0200 (Sat, 24 Oct 2009)
New Revision: 4842
Modified:
trunk/coreboot-v2/src/pc80/keyboard.c
Log:
Rework the keyboard driver
* use readable macro names rather than numbers.
* Factor out some commonly used code
Signed-off-by: Stefan Reinauer <ste...@coresystems.de>
Acked-by: Myles Watson <myle...@gmail.com>
Modified: trunk/coreboot-v2/src/pc80/keyboard.c
===================================================================
--- trunk/coreboot-v2/src/pc80/keyboard.c 2009-10-24 18:02:04 UTC (rev
4841)
+++ trunk/coreboot-v2/src/pc80/keyboard.c 2009-10-24 18:15:07 UTC (rev
4842)
@@ -26,13 +26,47 @@
#include <arch/io.h>
#include <delay.h>
+#define KBD_DATA 0x60
+#define KBD_COMMAND 0x64
+#define KBD_STATUS 0x64
+#define KBD_IBF (1 << 1) // 1: input buffer full (data ready for ec)
+#define KBD_OBF (1 << 0) // 1: output buffer full (data ready for host)
+
+// Keyboard Controller Commands
+#define KBC_CMD_READ_COMMAND 0x20 // Read command byte
+#define KBC_CMD_WRITE_COMMAND 0x60 // Write command byte
+#define KBC_CMD_SELF_TEST 0xAA // Controller self-test
+
+/* The Keyboard controller command byte
+ * BIT | Description
+ * ----+-------------------------------------------------------
+ * 7 | reserved, must be zero
+ * 6 | XT Translation, (1 = on, 0 = off)
+ * 5 | Disable Mouse Port (1 = disable, 0 = enable)
+ * 4 | Disable Keyboard Port (1 = disable, 0 = enable)
+ * 3 | reserved, must be zero
+ * 2 | System Flag (1 = self-test passed. DO NOT SET TO ZERO)
+ * 1 | Mouse Port Interrupts (1 = enable, 0 = disable)
+ * 0 | Keyboard Port Interrupts (1 = enable, 0 = disable)
+ */
+
+// Keyboard Controller Replies
+#define KBC_REPLY_SELFTEST_OK 0x55 // controller self-test succeeded
+
+//
+// Keyboard Replies
+//
+#define KBD_REPLY_POR 0xAA // Power on reset
+#define KBD_REPLY_ACK 0xFA // Command ACK
+#define KBD_REPLY_RESEND 0xFE // Command NACK, send command again
+
/* Wait 200ms for keyboard controller answers */
#define KBC_TIMEOUT_IN_MS 200
static int kbc_input_buffer_empty(void)
{
u32 timeout;
- for(timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(0x64) & 0x02);
timeout--) {
+ for(timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(KBD_STATUS) &
KBD_IBF); timeout--) {
mdelay(1);
}
@@ -46,7 +80,7 @@
static int kbc_output_buffer_full(void)
{
u32 timeout;
- for(timeout = KBC_TIMEOUT_IN_MS; timeout && ((inb(0x64) & 0x01) == 0);
timeout--) {
+ for(timeout = KBC_TIMEOUT_IN_MS; timeout && ((inb(KBD_STATUS) &
KBD_OBF) == 0); timeout--) {
mdelay(1);
}
@@ -60,19 +94,51 @@
static int kbc_cleanup_buffers(void)
{
u32 timeout;
- for(timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(0x64) & 0x03);
timeout--) {
+ for(timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(KBD_STATUS) & (KBD_OBF
| KBD_IBF)); timeout--) {
mdelay(1);
- inb(0x60);
+ inb(KBD_DATA);
}
if (!timeout) {
printk_err("Couldn't cleanup the keyboard controller
buffers\n");
- printk_err("0x64: 0x%x, 0x60: 0x%x\n", inb(0x64), inb(0x60));
+ printk_err("Status (0x%x): 0x%x, Buffer (0x%x): 0x%x\n",
+ KBD_STATUS, inb(KBD_STATUS), KBD_DATA,
inb(KBD_DATA));
}
+
return !!timeout;
}
+static int kbc_self_test(void)
+{
+ u8 self_test;
+ /* Clean up any junk that might have been in the KBC.
+ * Both input and output buffers must be empty.
+ */
+ if (!kbc_cleanup_buffers())
+ return 0;
+
+ /* reset/self test 8042 - send cmd 0xAA */
+ outb(KBC_CMD_SELF_TEST, KBD_COMMAND);
+
+ if (!kbc_output_buffer_full()) {
+ /* There probably is no keyboard controller. */
+ printk_err("Could not reset keyboard controller.\n");
+ return 0;
+ }
+
+ /* read self-test result, 0x55 is returned in the output buffer */
+ self_test = inb(KBD_DATA);
+
+ if (self_test != 0x55) {
+ printk_err("Keyboard Controller self-test failed: 0x%x\n",
+ self_test);
+ return 0;
+ }
+
+ return 1;
+}
+
static u8 send_keyboard(u8 command)
{
u8 regval = 0;
@@ -80,47 +146,33 @@
do {
if (!kbc_input_buffer_empty()) return 0;
- outb(command, 0x60);
+ outb(command, KBD_DATA);
if (!kbc_output_buffer_full()) {
printk_err("Could not send keyboard command %02x\n",
command);
return 0;
}
- regval = inb(0x60);
+ regval = inb(KBD_DATA);
--resend;
} while (regval == 0xFE && resend > 0);
return regval;
}
-
static void pc_keyboard_init(struct pc_keyboard *keyboard)
{
u8 regval;
printk_debug("Keyboard init...\n");
- /* clean up any junk that might have been in the kbc */
- if (!kbc_cleanup_buffers()) return;
-
- /* reset/self test 8042 - send cmd 0xAA */
- if (!kbc_input_buffer_empty()) return;
- outb(0xAA, 0x64);
- if (!kbc_output_buffer_full()) {
- printk_err("Could not reset keyboard controller.\n");
+ /* Run a keyboard controller self-test */
+ if (!kbc_self_test())
return;
- }
- /* read self-test result, 0x55 is returned in the output buffer (0x60)
*/
- if ((regval = inb(0x60) != 0x55)) {
- printk_err("Keyboard Controller self-test failed: 0x%x\n",
regval);
- return;
- }
-
/* Enable keyboard interface - No IRQ */
if (!kbc_input_buffer_empty()) return;
- outb(0x60, 0x64);
+ outb(0x60, KBD_COMMAND);
if (!kbc_input_buffer_empty()) return;
- outb(0x20, 0x60); /* send cmd: enable keyboard */
+ outb(0x20, KBD_DATA); /* send cmd: enable keyboard */
if (!kbc_input_buffer_empty()) {
printk_info("Timeout while enabling keyboard\n");
return;
@@ -135,12 +187,13 @@
printk_err("Keyboard selftest failed ACK: 0x%x\n", regval);
return;
}
+
if (!kbc_output_buffer_full()) {
printk_err("Timeout waiting for keyboard after reset.\n");
return;
}
-
- regval = inb(0x60);
+
+ regval = inb(KBD_DATA);
if (regval != 0xAA) {
printk_err("Keyboard selftest failed: 0x%x\n", regval);
return;
@@ -180,10 +233,10 @@
/* All is well - enable keyboard interface */
if (!kbc_input_buffer_empty()) return;
- outb(0x60, 0x64);
+ outb(0x60, KBD_COMMAND);
if (!kbc_input_buffer_empty()) return;
- outb(0x61, 0x60); /* send cmd: enable keyboard and IRQ 1 */
- if (!kbc_input_buffer_empty()) {
+ outb(0x61, KBD_DATA); /* send cmd: enable keyboard and IRQ 1 */
+ if (kbc_output_buffer_full()) {
printk_err("Timeout during final keyboard enable\n");
return;
}
@@ -194,6 +247,8 @@
{
if ((port0 == 0x60) && (port1 == 0x64)) {
pc_keyboard_init(kbd);
+ } else {
+ printk_warning("Unsupported keyboard controller.\n");
}
}
@@ -204,24 +259,16 @@
*/
void set_kbc_ps2_mode(void)
{
- /* clean up any junk that might have been in the kbc */
- if (!kbc_cleanup_buffers()) return;
-
- /* reset/self test 8042 before we can do anything */
- if (!kbc_input_buffer_empty()) return;
- outb(0xAA, 0x64);
- if (!kbc_output_buffer_full()) return;
-
- /* read self-test result, 0x55 is returned in the output buffer (0x60)
*/
- if ((inb(0x60) != 0x55)) {
- printk_err("Keyboard Controller selftest failed\n");
+ /* Run a keyboard controller self-test */
+ if (!kbc_self_test())
return;
- }
/* Support PS/2 mode */
if (!kbc_input_buffer_empty()) return;
- outb(0xcb, 0x64);
+ outb(0xcb, KBD_COMMAND);
+
if (!kbc_input_buffer_empty()) return;
- outb(0x01, 0x60);
+ outb(0x01, KBD_DATA);
+
kbc_cleanup_buffers();
}
--
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