diff options
Diffstat (limited to 'drivers/ps2mult.c')
| -rw-r--r-- | drivers/ps2mult.c | 456 |
1 files changed, 456 insertions, 0 deletions
diff --git a/drivers/ps2mult.c b/drivers/ps2mult.c new file mode 100644 index 0000000..c0457b8 --- /dev/null +++ b/drivers/ps2mult.c @@ -0,0 +1,456 @@ +/*********************************************************************** + * + * (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 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]; + + +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; + + 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 */ |