| /* |
| * 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 |
| |
| /* 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; |
| } |
| |
| 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); |
| 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 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 selftest failed ACK: 0x%x\n", regval); |
| return; |
| } |
| |
| 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 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; |
| } |
| |
| /* enable the keyboard */ |
| regval = send_keyboard(0xF4); |
| if (regval != KBD_REPLY_ACK) { |
| printk(BIOS_ERR, "Keyboard enable 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(0x61, KBD_DATA); /* send cmd: enable keyboard and IRQ 1 */ |
| if (!kbc_input_buffer_empty()) { |
| printk(BIOS_ERR, "Timeout during final keyboard enable\n"); |
| 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(); |
| } |