463 lines
8.8 KiB
C
463 lines
8.8 KiB
C
/***********************************************************************
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*
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* (C) Copyright 2004
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* DENX Software Engineering
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* Wolfgang Denk, wd@denx.de
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* All rights reserved.
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*
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* PS/2 multiplexer driver
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*
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* Originally from linux source (drivers/char/ps2mult.c)
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*
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* Uses simple serial driver (ps2ser.c) to access the multiplexer
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* Used by PS/2 keyboard driver (pc_keyb.c)
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*
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***********************************************************************/
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#include <common.h>
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#include <pc_keyb.h>
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#include <asm/atomic.h>
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#include <ps2mult.h>
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/* #define DEBUG_MULT */
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/* #define DEBUG_KEYB */
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#define KBD_STAT_DEFAULT (KBD_STAT_SELFTEST | KBD_STAT_UNLOCKED)
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#define PRINTF(format, args...) printf("ps2mult.c: " format, ## args)
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#ifdef DEBUG_MULT
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#define PRINTF_MULT(format, args...) printf("PS2MULT: " format, ## args)
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#else
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#define PRINTF_MULT(format, args...)
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#endif
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#ifdef DEBUG_KEYB
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#define PRINTF_KEYB(format, args...) printf("KEYB: " format, ## args)
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#else
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#define PRINTF_KEYB(format, args...)
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#endif
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static ulong start_time;
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static int init_done = 0;
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static int received_escape = 0;
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static int received_bsync = 0;
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static int received_selector = 0;
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static int kbd_command_active = 0;
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static int mouse_command_active = 0;
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static int ctl_command_active = 0;
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static u_char command_byte = 0;
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static void (*keyb_handler)(void *dev_id);
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static u_char ps2mult_buf [PS2BUF_SIZE];
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static atomic_t ps2mult_buf_cnt;
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static int ps2mult_buf_in_idx;
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static int ps2mult_buf_out_idx;
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static u_char ps2mult_buf_status [PS2BUF_SIZE];
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#ifndef CONFIG_BOARD_EARLY_INIT_R
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#error #define CONFIG_BOARD_EARLY_INIT_R and call ps2mult_early_init() in board_early_init_r()
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#endif
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void ps2mult_early_init (void)
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{
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start_time = get_timer(0);
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}
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static void ps2mult_send_byte(u_char byte, u_char sel)
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{
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ps2ser_putc(sel);
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if (sel == PS2MULT_KB_SELECTOR) {
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PRINTF_MULT("0x%02x send KEYBOARD\n", byte);
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kbd_command_active = 1;
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} else {
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PRINTF_MULT("0x%02x send MOUSE\n", byte);
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mouse_command_active = 1;
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}
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switch (byte) {
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case PS2MULT_ESCAPE:
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case PS2MULT_BSYNC:
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case PS2MULT_KB_SELECTOR:
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case PS2MULT_MS_SELECTOR:
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case PS2MULT_SESSION_START:
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case PS2MULT_SESSION_END:
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ps2ser_putc(PS2MULT_ESCAPE);
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break;
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default:
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break;
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}
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ps2ser_putc(byte);
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}
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static void ps2mult_receive_byte(u_char byte, u_char sel)
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{
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u_char status = KBD_STAT_DEFAULT;
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#if 1 /* Ignore mouse in U-Boot */
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if (sel == PS2MULT_MS_SELECTOR) return;
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#endif
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if (sel == PS2MULT_KB_SELECTOR) {
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if (kbd_command_active) {
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if (!received_bsync) {
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PRINTF_MULT("0x%02x lost KEYBOARD !!!\n", byte);
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return;
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} else {
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kbd_command_active = 0;
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received_bsync = 0;
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}
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}
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PRINTF_MULT("0x%02x receive KEYBOARD\n", byte);
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status |= KBD_STAT_IBF | KBD_STAT_OBF;
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} else {
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if (mouse_command_active) {
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if (!received_bsync) {
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PRINTF_MULT("0x%02x lost MOUSE !!!\n", byte);
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return;
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} else {
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mouse_command_active = 0;
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received_bsync = 0;
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}
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}
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PRINTF_MULT("0x%02x receive MOUSE\n", byte);
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status |= KBD_STAT_IBF | KBD_STAT_OBF | KBD_STAT_MOUSE_OBF;
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}
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if (atomic_read(&ps2mult_buf_cnt) < PS2BUF_SIZE) {
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ps2mult_buf_status[ps2mult_buf_in_idx] = status;
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ps2mult_buf[ps2mult_buf_in_idx++] = byte;
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ps2mult_buf_in_idx &= (PS2BUF_SIZE - 1);
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atomic_inc(&ps2mult_buf_cnt);
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} else {
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PRINTF("buffer overflow\n");
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}
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if (received_bsync) {
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PRINTF("unexpected BSYNC\n");
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received_bsync = 0;
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}
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}
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void ps2mult_callback (int in_cnt)
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{
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int i;
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u_char byte;
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static int keyb_handler_active = 0;
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if (!init_done) {
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return;
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}
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for (i = 0; i < in_cnt; i ++) {
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byte = ps2ser_getc();
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if (received_escape) {
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ps2mult_receive_byte(byte, received_selector);
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received_escape = 0;
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} else switch (byte) {
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case PS2MULT_ESCAPE:
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PRINTF_MULT("ESCAPE receive\n");
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received_escape = 1;
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break;
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case PS2MULT_BSYNC:
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PRINTF_MULT("BSYNC receive\n");
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received_bsync = 1;
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break;
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case PS2MULT_KB_SELECTOR:
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case PS2MULT_MS_SELECTOR:
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PRINTF_MULT("%s receive\n",
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byte == PS2MULT_KB_SELECTOR ? "KB_SEL" : "MS_SEL");
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received_selector = byte;
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break;
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case PS2MULT_SESSION_START:
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case PS2MULT_SESSION_END:
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PRINTF_MULT("%s receive\n",
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byte == PS2MULT_SESSION_START ?
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"SESSION_START" : "SESSION_END");
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break;
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default:
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ps2mult_receive_byte(byte, received_selector);
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}
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}
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if (keyb_handler && !keyb_handler_active &&
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atomic_read(&ps2mult_buf_cnt)) {
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keyb_handler_active = 1;
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keyb_handler(NULL);
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keyb_handler_active = 0;
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}
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}
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u_char ps2mult_read_status(void)
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{
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u_char byte;
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if (atomic_read(&ps2mult_buf_cnt) == 0) {
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ps2ser_check();
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}
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if (atomic_read(&ps2mult_buf_cnt)) {
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byte = ps2mult_buf_status[ps2mult_buf_out_idx];
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} else {
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byte = KBD_STAT_DEFAULT;
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}
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PRINTF_KEYB("read_status()=0x%02x\n", byte);
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return byte;
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}
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u_char ps2mult_read_input(void)
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{
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u_char byte = 0;
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if (atomic_read(&ps2mult_buf_cnt) == 0) {
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ps2ser_check();
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}
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if (atomic_read(&ps2mult_buf_cnt)) {
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byte = ps2mult_buf[ps2mult_buf_out_idx++];
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ps2mult_buf_out_idx &= (PS2BUF_SIZE - 1);
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atomic_dec(&ps2mult_buf_cnt);
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}
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PRINTF_KEYB("read_input()=0x%02x\n", byte);
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return byte;
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}
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void ps2mult_write_output(u_char val)
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{
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int i;
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PRINTF_KEYB("write_output(0x%02x)\n", val);
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for (i = 0; i < KBD_TIMEOUT; i++) {
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if (!kbd_command_active && !mouse_command_active) {
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break;
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}
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udelay(1000);
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ps2ser_check();
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}
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if (kbd_command_active) {
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PRINTF("keyboard command not acknoledged\n");
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kbd_command_active = 0;
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}
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if (mouse_command_active) {
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PRINTF("mouse command not acknoledged\n");
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mouse_command_active = 0;
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}
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if (ctl_command_active) {
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switch (ctl_command_active) {
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case KBD_CCMD_WRITE_MODE:
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/* Scan code conversion not supported */
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command_byte = val & ~KBD_MODE_KCC;
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break;
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case KBD_CCMD_WRITE_AUX_OBUF:
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ps2mult_receive_byte(val, PS2MULT_MS_SELECTOR);
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break;
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case KBD_CCMD_WRITE_MOUSE:
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ps2mult_send_byte(val, PS2MULT_MS_SELECTOR);
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break;
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default:
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PRINTF("invalid controller command\n");
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break;
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}
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ctl_command_active = 0;
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return;
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}
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ps2mult_send_byte(val, PS2MULT_KB_SELECTOR);
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}
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void ps2mult_write_command(u_char val)
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{
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ctl_command_active = 0;
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PRINTF_KEYB("write_command(0x%02x)\n", val);
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switch (val) {
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case KBD_CCMD_READ_MODE:
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ps2mult_receive_byte(command_byte, PS2MULT_KB_SELECTOR);
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break;
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case KBD_CCMD_WRITE_MODE:
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ctl_command_active = val;
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break;
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case KBD_CCMD_MOUSE_DISABLE:
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break;
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case KBD_CCMD_MOUSE_ENABLE:
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break;
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case KBD_CCMD_SELF_TEST:
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ps2mult_receive_byte(0x55, PS2MULT_KB_SELECTOR);
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break;
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case KBD_CCMD_KBD_TEST:
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ps2mult_receive_byte(0x00, PS2MULT_KB_SELECTOR);
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break;
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case KBD_CCMD_KBD_DISABLE:
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break;
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case KBD_CCMD_KBD_ENABLE:
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break;
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case KBD_CCMD_WRITE_AUX_OBUF:
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ctl_command_active = val;
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break;
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case KBD_CCMD_WRITE_MOUSE:
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ctl_command_active = val;
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break;
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default:
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PRINTF("invalid controller command\n");
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break;
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}
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}
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static int ps2mult_getc_w (void)
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{
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int res = -1;
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int i;
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for (i = 0; i < KBD_TIMEOUT; i++) {
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if (ps2ser_check()) {
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res = ps2ser_getc();
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break;
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}
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udelay(1000);
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}
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switch (res) {
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case PS2MULT_KB_SELECTOR:
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case PS2MULT_MS_SELECTOR:
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received_selector = res;
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break;
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default:
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break;
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}
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return res;
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}
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int ps2mult_init (void)
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{
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int byte;
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int kbd_found = 0;
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int mouse_found = 0;
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while (get_timer(start_time) < CONFIG_PS2MULT_DELAY);
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ps2ser_init();
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ps2ser_putc(PS2MULT_SESSION_START);
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ps2ser_putc(PS2MULT_KB_SELECTOR);
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ps2ser_putc(KBD_CMD_RESET);
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do {
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byte = ps2mult_getc_w();
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} while (byte >= 0 && byte != KBD_REPLY_ACK);
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if (byte == KBD_REPLY_ACK) {
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byte = ps2mult_getc_w();
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if (byte == 0xaa) {
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kbd_found = 1;
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puts("keyboard");
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}
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}
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if (!kbd_found) {
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while (byte >= 0) {
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byte = ps2mult_getc_w();
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}
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}
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#if 1 /* detect mouse */
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ps2ser_putc(PS2MULT_MS_SELECTOR);
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ps2ser_putc(AUX_RESET);
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do {
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byte = ps2mult_getc_w();
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} while (byte >= 0 && byte != AUX_ACK);
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if (byte == AUX_ACK) {
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byte = ps2mult_getc_w();
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if (byte == 0xaa) {
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byte = ps2mult_getc_w();
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if (byte == 0x00) {
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mouse_found = 1;
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puts(", mouse");
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}
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}
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}
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if (!mouse_found) {
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while (byte >= 0) {
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byte = ps2mult_getc_w();
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}
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}
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#endif
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if (mouse_found || kbd_found) {
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if (!received_selector) {
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if (mouse_found) {
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received_selector = PS2MULT_MS_SELECTOR;
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} else {
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received_selector = PS2MULT_KB_SELECTOR;
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}
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}
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init_done = 1;
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} else {
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puts("No device found");
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}
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puts("\n");
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#if 0 /* for testing */
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{
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int i;
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u_char key[] = {
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0x1f, 0x12, 0x14, 0x12, 0x31, 0x2f, 0x39, /* setenv */
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0x1f, 0x14, 0x20, 0x17, 0x31, 0x39, /* stdin */
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0x1f, 0x12, 0x13, 0x17, 0x1e, 0x26, 0x1c, /* serial */
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};
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for (i = 0; i < sizeof (key); i++) {
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ps2mult_receive_byte (key[i], PS2MULT_KB_SELECTOR);
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ps2mult_receive_byte (key[i] | 0x80, PS2MULT_KB_SELECTOR);
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}
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}
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#endif
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return init_done ? 0 : -1;
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}
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int ps2mult_request_irq(void (*handler)(void *))
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{
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keyb_handler = handler;
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return 0;
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}
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