u-boot/drivers/ps2mult.c
wdenk c837dcb1a3 * The PS/2 mux on the BMS2003 board needs 450 ms after power on
before we can access it; add delay in case we are faster (with no
  CF card inserted)

* Cleanup of some init functions

* Make sure SCC Ethernet is always stopped by the time we boot Linux
  to avoid Linux crashes by early packets coming in.

* Accelerate flash accesses on LWMON board by using buffered writes
2004-01-20 23:12:12 +00:00

467 lines
8.9 KiB
C

/***********************************************************************
*
* (C) Copyright 2004
* DENX Software Engineering
* Wolfgang Denk, wd@denx.de
* All rights reserved.
*
* PS/2 multiplexer driver
*
* Originally from linux source (drivers/char/ps2mult.c)
*
* Uses simple serial driver (ps2ser.c) to access the multiplexer
* Used by PS/2 keyboard driver (pc_keyb.c)
*
***********************************************************************/
#include <common.h>
#ifdef CONFIG_PS2MULT
#include <pc_keyb.h>
#include <asm/atomic.h>
#include <ps2mult.h>
/* #define DEBUG_MULT */
/* #define DEBUG_KEYB */
#define KBD_STAT_DEFAULT (KBD_STAT_SELFTEST | KBD_STAT_UNLOCKED)
#define PRINTF(format, args...) printf("ps2mult.c: " format, ## args)
#ifdef DEBUG_MULT
#define PRINTF_MULT(format, args...) printf("PS2MULT: " format, ## args)
#else
#define PRINTF_MULT(format, args...)
#endif
#ifdef DEBUG_KEYB
#define PRINTF_KEYB(format, args...) printf("KEYB: " format, ## args)
#else
#define PRINTF_KEYB(format, args...)
#endif
static ulong start_time;
static int init_done = 0;
static int received_escape = 0;
static int received_bsync = 0;
static int received_selector = 0;
static int kbd_command_active = 0;
static int mouse_command_active = 0;
static int ctl_command_active = 0;
static u_char command_byte = 0;
static void (*keyb_handler)(void *dev_id);
static u_char ps2mult_buf [PS2BUF_SIZE];
static atomic_t ps2mult_buf_cnt;
static int ps2mult_buf_in_idx;
static int ps2mult_buf_out_idx;
static u_char ps2mult_buf_status [PS2BUF_SIZE];
#ifndef CONFIG_BOARD_EARLY_INIT_R
#error #define CONFIG_BOARD_EARLY_INIT_R and call ps2mult_early_init() in board_early_init_r()
#endif
void ps2mult_early_init (void)
{
start_time = get_timer(0);
}
static void ps2mult_send_byte(u_char byte, u_char sel)
{
ps2ser_putc(sel);
if (sel == PS2MULT_KB_SELECTOR) {
PRINTF_MULT("0x%02x send KEYBOARD\n", byte);
kbd_command_active = 1;
} else {
PRINTF_MULT("0x%02x send MOUSE\n", byte);
mouse_command_active = 1;
}
switch (byte) {
case PS2MULT_ESCAPE:
case PS2MULT_BSYNC:
case PS2MULT_KB_SELECTOR:
case PS2MULT_MS_SELECTOR:
case PS2MULT_SESSION_START:
case PS2MULT_SESSION_END:
ps2ser_putc(PS2MULT_ESCAPE);
break;
default:
break;
}
ps2ser_putc(byte);
}
static void ps2mult_receive_byte(u_char byte, u_char sel)
{
u_char status = KBD_STAT_DEFAULT;
#if 1 /* Ignore mouse in U-Boot */
if (sel == PS2MULT_MS_SELECTOR) return;
#endif
if (sel == PS2MULT_KB_SELECTOR) {
if (kbd_command_active) {
if (!received_bsync) {
PRINTF_MULT("0x%02x lost KEYBOARD !!!\n", byte);
return;
} else {
kbd_command_active = 0;
received_bsync = 0;
}
}
PRINTF_MULT("0x%02x receive KEYBOARD\n", byte);
status |= KBD_STAT_IBF | KBD_STAT_OBF;
} else {
if (mouse_command_active) {
if (!received_bsync) {
PRINTF_MULT("0x%02x lost MOUSE !!!\n", byte);
return;
} else {
mouse_command_active = 0;
received_bsync = 0;
}
}
PRINTF_MULT("0x%02x receive MOUSE\n", byte);
status |= KBD_STAT_IBF | KBD_STAT_OBF | KBD_STAT_MOUSE_OBF;
}
if (atomic_read(&ps2mult_buf_cnt) < PS2BUF_SIZE) {
ps2mult_buf_status[ps2mult_buf_in_idx] = status;
ps2mult_buf[ps2mult_buf_in_idx++] = byte;
ps2mult_buf_in_idx &= (PS2BUF_SIZE - 1);
atomic_inc(&ps2mult_buf_cnt);
} else {
PRINTF("buffer overflow\n");
}
if (received_bsync) {
PRINTF("unexpected BSYNC\n");
received_bsync = 0;
}
}
void ps2mult_callback (int in_cnt)
{
int i;
u_char byte;
static int keyb_handler_active = 0;
if (!init_done) {
return;
}
for (i = 0; i < in_cnt; i ++) {
byte = ps2ser_getc();
if (received_escape) {
ps2mult_receive_byte(byte, received_selector);
received_escape = 0;
} else switch (byte) {
case PS2MULT_ESCAPE:
PRINTF_MULT("ESCAPE receive\n");
received_escape = 1;
break;
case PS2MULT_BSYNC:
PRINTF_MULT("BSYNC receive\n");
received_bsync = 1;
break;
case PS2MULT_KB_SELECTOR:
case PS2MULT_MS_SELECTOR:
PRINTF_MULT("%s receive\n",
byte == PS2MULT_KB_SELECTOR ? "KB_SEL" : "MS_SEL");
received_selector = byte;
break;
case PS2MULT_SESSION_START:
case PS2MULT_SESSION_END:
PRINTF_MULT("%s receive\n",
byte == PS2MULT_SESSION_START ?
"SESSION_START" : "SESSION_END");
break;
default:
ps2mult_receive_byte(byte, received_selector);
}
}
if (keyb_handler && !keyb_handler_active &&
atomic_read(&ps2mult_buf_cnt)) {
keyb_handler_active = 1;
keyb_handler(NULL);
keyb_handler_active = 0;
}
}
u_char ps2mult_read_status(void)
{
u_char byte;
if (atomic_read(&ps2mult_buf_cnt) == 0) {
ps2ser_check();
}
if (atomic_read(&ps2mult_buf_cnt)) {
byte = ps2mult_buf_status[ps2mult_buf_out_idx];
} else {
byte = KBD_STAT_DEFAULT;
}
PRINTF_KEYB("read_status()=0x%02x\n", byte);
return byte;
}
u_char ps2mult_read_input(void)
{
u_char byte = 0;
if (atomic_read(&ps2mult_buf_cnt) == 0) {
ps2ser_check();
}
if (atomic_read(&ps2mult_buf_cnt)) {
byte = ps2mult_buf[ps2mult_buf_out_idx++];
ps2mult_buf_out_idx &= (PS2BUF_SIZE - 1);
atomic_dec(&ps2mult_buf_cnt);
}
PRINTF_KEYB("read_input()=0x%02x\n", byte);
return byte;
}
void ps2mult_write_output(u_char val)
{
int i;
PRINTF_KEYB("write_output(0x%02x)\n", val);
for (i = 0; i < KBD_TIMEOUT; i++) {
if (!kbd_command_active && !mouse_command_active) {
break;
}
udelay(1000);
ps2ser_check();
}
if (kbd_command_active) {
PRINTF("keyboard command not acknoledged\n");
kbd_command_active = 0;
}
if (mouse_command_active) {
PRINTF("mouse command not acknoledged\n");
mouse_command_active = 0;
}
if (ctl_command_active) {
switch (ctl_command_active) {
case KBD_CCMD_WRITE_MODE:
/* Scan code conversion not supported */
command_byte = val & ~KBD_MODE_KCC;
break;
case KBD_CCMD_WRITE_AUX_OBUF:
ps2mult_receive_byte(val, PS2MULT_MS_SELECTOR);
break;
case KBD_CCMD_WRITE_MOUSE:
ps2mult_send_byte(val, PS2MULT_MS_SELECTOR);
break;
default:
PRINTF("invalid controller command\n");
break;
}
ctl_command_active = 0;
return;
}
ps2mult_send_byte(val, PS2MULT_KB_SELECTOR);
}
void ps2mult_write_command(u_char val)
{
ctl_command_active = 0;
PRINTF_KEYB("write_command(0x%02x)\n", val);
switch (val) {
case KBD_CCMD_READ_MODE:
ps2mult_receive_byte(command_byte, PS2MULT_KB_SELECTOR);
break;
case KBD_CCMD_WRITE_MODE:
ctl_command_active = val;
break;
case KBD_CCMD_MOUSE_DISABLE:
break;
case KBD_CCMD_MOUSE_ENABLE:
break;
case KBD_CCMD_SELF_TEST:
ps2mult_receive_byte(0x55, PS2MULT_KB_SELECTOR);
break;
case KBD_CCMD_KBD_TEST:
ps2mult_receive_byte(0x00, PS2MULT_KB_SELECTOR);
break;
case KBD_CCMD_KBD_DISABLE:
break;
case KBD_CCMD_KBD_ENABLE:
break;
case KBD_CCMD_WRITE_AUX_OBUF:
ctl_command_active = val;
break;
case KBD_CCMD_WRITE_MOUSE:
ctl_command_active = val;
break;
default:
PRINTF("invalid controller command\n");
break;
}
}
static int ps2mult_getc_w (void)
{
int res = -1;
int i;
for (i = 0; i < KBD_TIMEOUT; i++) {
if (ps2ser_check()) {
res = ps2ser_getc();
break;
}
udelay(1000);
}
switch (res) {
case PS2MULT_KB_SELECTOR:
case PS2MULT_MS_SELECTOR:
received_selector = res;
break;
default:
break;
}
return res;
}
int ps2mult_init (void)
{
int byte;
int kbd_found = 0;
int mouse_found = 0;
while (get_timer(start_time) < CONFIG_PS2MULT_DELAY);
ps2ser_init();
ps2ser_putc(PS2MULT_SESSION_START);
ps2ser_putc(PS2MULT_KB_SELECTOR);
ps2ser_putc(KBD_CMD_RESET);
do {
byte = ps2mult_getc_w();
} while (byte >= 0 && byte != KBD_REPLY_ACK);
if (byte == KBD_REPLY_ACK) {
byte = ps2mult_getc_w();
if (byte == 0xaa) {
kbd_found = 1;
puts("keyboard");
}
}
if (!kbd_found) {
while (byte >= 0) {
byte = ps2mult_getc_w();
}
}
#if 1 /* detect mouse */
ps2ser_putc(PS2MULT_MS_SELECTOR);
ps2ser_putc(AUX_RESET);
do {
byte = ps2mult_getc_w();
} while (byte >= 0 && byte != AUX_ACK);
if (byte == AUX_ACK) {
byte = ps2mult_getc_w();
if (byte == 0xaa) {
byte = ps2mult_getc_w();
if (byte == 0x00) {
mouse_found = 1;
puts(", mouse");
}
}
}
if (!mouse_found) {
while (byte >= 0) {
byte = ps2mult_getc_w();
}
}
#endif
if (mouse_found || kbd_found) {
if (!received_selector) {
if (mouse_found) {
received_selector = PS2MULT_MS_SELECTOR;
} else {
received_selector = PS2MULT_KB_SELECTOR;
}
}
init_done = 1;
} else {
puts("No device found");
}
puts("\n");
#if 0 /* for testing */
{
int i;
u_char key[] = {
0x1f, 0x12, 0x14, 0x12, 0x31, 0x2f, 0x39, /* setenv */
0x1f, 0x14, 0x20, 0x17, 0x31, 0x39, /* stdin */
0x1f, 0x12, 0x13, 0x17, 0x1e, 0x26, 0x1c, /* serial */
};
for (i = 0; i < sizeof (key); i++) {
ps2mult_receive_byte (key[i], PS2MULT_KB_SELECTOR);
ps2mult_receive_byte (key[i] | 0x80, PS2MULT_KB_SELECTOR);
}
}
#endif
return init_done ? 0 : -1;
}
int ps2mult_request_irq(void (*handler)(void *))
{
keyb_handler = handler;
return 0;
}
#endif /* CONFIG_PS2MULT */