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author | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2012-04-27 02:31:28 +0200 |
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committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2012-04-27 19:23:16 +0200 |
commit | ae5e11d7cd7484343d277fb454fb19fdff34730d (patch) | |
tree | 231aede3dcf80242a4e68e2b4268835f4bf1c5c6 /src/drivers/pc80/keyboard.c | |
parent | aee1869fcf6c5eb1616f8c5c5a446c2b2de693e8 (diff) | |
download | coreboot-ae5e11d7cd7484343d277fb454fb19fdff34730d.tar.xz |
Move top level pc80 directory to drivers/
There is no reason for this to be a top level directory.
Some stuff from lib/ should also be moved to drivers/
Change-Id: I3c2d2e127f7215eadead029cfc7442c22b26814a
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/939
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src/drivers/pc80/keyboard.c')
-rw-r--r-- | src/drivers/pc80/keyboard.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/src/drivers/pc80/keyboard.c b/src/drivers/pc80/keyboard.c new file mode 100644 index 0000000000..e0a6643334 --- /dev/null +++ b/src/drivers/pc80/keyboard.c @@ -0,0 +1,306 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2009 coresystems GmbH + * Copyright (C) 2008 Advanced Micro Devices, Inc. + * Copyright (C) 2003 Ollie Lo <ollielo@hotmail.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + + +#include <console/console.h> +#include <pc80/keyboard.h> +#include <device/device.h> +#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 +#define KBC_CMD_KBD_TEST 0xAB // Keyboard Interface 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 400ms for keyboard controller answers */ +#define KBC_TIMEOUT_IN_MS 400 + +static int kbc_input_buffer_empty(void) +{ + u32 timeout; + for(timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(KBD_STATUS) & KBD_IBF); timeout--) { + mdelay(1); + } + + if (!timeout) { + printk(BIOS_WARNING, "Unexpected Keyboard controller input buffer full\n"); + } + return !!timeout; +} + + +static int kbc_output_buffer_full(void) +{ + u32 timeout; + for(timeout = KBC_TIMEOUT_IN_MS; timeout && ((inb(KBD_STATUS) & KBD_OBF) == 0); timeout--) { + mdelay(1); + } + + if (!timeout) { + printk(BIOS_INFO, "Keyboard controller output buffer result timeout\n"); + } + return !!timeout; +} + + +static int kbc_cleanup_buffers(void) +{ + u32 timeout; + for(timeout = KBC_TIMEOUT_IN_MS; timeout && (inb(KBD_STATUS) & (KBD_OBF | KBD_IBF)); timeout--) { + mdelay(1); + inb(KBD_DATA); + } + + if (!timeout) { + printk(BIOS_ERR, "Couldn't cleanup the keyboard controller buffers\n"); + printk(BIOS_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(BIOS_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(BIOS_ERR, "Keyboard Controller self-test failed: 0x%x\n", + self_test); + return 0; + } + + /* ensure the buffers are empty */ + kbc_cleanup_buffers(); + + /* keyboard interface test */ + outb(KBC_CMD_KBD_TEST, KBD_COMMAND); + + if (!kbc_output_buffer_full()) { + printk(BIOS_ERR, "Keyboard Interface test timed out.\n"); + return 0; + } + + /* read test result, 0x00 should be returned in case of no failures */ + self_test = inb(KBD_DATA); + + if (self_test != 0x00) { + printk(BIOS_ERR, "Keyboard Interface test failed: 0x%x\n", + self_test); + return 0; + } + + return 1; +} + +static u8 send_keyboard(u8 command) +{ + u8 regval = 0; + u8 resend = 10; + + do { + if (!kbc_input_buffer_empty()) return 0; + outb(command, KBD_DATA); + /* the reset command takes much longer then normal commands and + * even worse, some keyboards do send the ACK _after_ doing the + * reset */ + if (command == 0xFF) { + u8 retries; + for (retries = 9; retries && !kbc_output_buffer_full(); retries--) + ; + } + if (!kbc_output_buffer_full()) { + printk(BIOS_ERR, "Could not send keyboard command %02x\n", + command); + return 0; + } + regval = inb(KBD_DATA); + --resend; + } while (regval == KBD_REPLY_RESEND && resend > 0); + + return regval; +} + +void pc_keyboard_init(struct pc_keyboard *keyboard) +{ + u8 retries; + u8 regval; + if (!CONFIG_DRIVERS_PS2_KEYBOARD) + return; + printk(BIOS_DEBUG, "Keyboard init...\n"); + + /* Run a keyboard controller self-test */ + if (!kbc_self_test()) + return; + + /* Enable keyboard interface - No IRQ */ + if (!kbc_input_buffer_empty()) return; + outb(0x60, KBD_COMMAND); + if (!kbc_input_buffer_empty()) return; + outb(0x20, KBD_DATA); /* send cmd: enable keyboard */ + if (!kbc_input_buffer_empty()) { + printk(BIOS_INFO, "Timeout while enabling keyboard\n"); + return; + } + + /* clean up any junk that might have been in the keyboard */ + if (!kbc_cleanup_buffers()) return; + + /* reset keyboard and self test (keyboard side) */ + regval = send_keyboard(0xFF); + if (regval == KBD_REPLY_RESEND) { + /* keeps sending RESENDs, probably no keyboard. */ + printk(BIOS_INFO, "No PS/2 keyboard detected.\n"); + return; + } + + if (regval != KBD_REPLY_ACK) { + printk(BIOS_ERR, "Keyboard reset failed ACK: 0x%x\n", regval); + return; + } + + /* the reset command takes some time, so wait a little longer */ + for (retries = 9; retries && !kbc_output_buffer_full(); retries--) + ; + + if (!kbc_output_buffer_full()) { + printk(BIOS_ERR, "Timeout waiting for keyboard after reset.\n"); + return; + } + + regval = inb(KBD_DATA); + if (regval != 0xAA) { + printk(BIOS_ERR, "Keyboard reset selftest failed: 0x%x\n", regval); + return; + } + + /* + * The following set scancode stuff is what normal BIOS do. It could be + * argued that coreboot shouldn't set the scan code..... + */ + + /* disable the keyboard */ + regval = send_keyboard(0xF5); + if (regval != KBD_REPLY_ACK) { + printk(BIOS_ERR, "Keyboard disable failed ACK: 0x%x\n", regval); + return; + } + + /* Set scancode command */ + regval = send_keyboard(0xF0); + if (regval != KBD_REPLY_ACK) { + printk(BIOS_ERR, "Keyboard set scancode cmd failed ACK: 0x%x\n", regval); + return; + } + /* Set scancode mode 2 */ + regval = send_keyboard(0x02); + if (regval != KBD_REPLY_ACK) { + printk(BIOS_ERR, "Keyboard set scancode mode failed ACK: 0x%x\n", regval); + return; + } + + /* All is well - enable keyboard interface */ + if (!kbc_input_buffer_empty()) return; + outb(0x60, KBD_COMMAND); + if (!kbc_input_buffer_empty()) return; + outb(0x65, KBD_DATA); /* send cmd: enable keyboard and IRQ 1 */ + if (!kbc_input_buffer_empty()) { + printk(BIOS_ERR, "Timeout during keyboard enable\n"); + return; + } + + /* enable the keyboard */ + regval = send_keyboard(0xF4); + if (regval != KBD_REPLY_ACK) { + printk(BIOS_ERR, "Keyboard enable failed ACK: 0x%x\n", regval); + return; + } +} + +/* + * Support PS/2 mode - oddball SIOs(KBC) need this setup + * Not well documented. Google - 0xcb keyboard controller + * This is called before pc_keyboard_init(). + */ +void set_kbc_ps2_mode(void) +{ + /* Run a keyboard controller self-test */ + if (!kbc_self_test()) + return; + + /* Support PS/2 mode */ + if (!kbc_input_buffer_empty()) return; + outb(0xcb, KBD_COMMAND); + + if (!kbc_input_buffer_empty()) return; + outb(0x01, KBD_DATA); + + kbc_cleanup_buffers(); +} |