Freescale u-boot repository
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 

625 lines
17 KiB

/*
* (C) Copyright 2001
* Denis Peter, MPL AG Switzerland, d.peter@mpl.ch
*
* SPDX-License-Identifier: GPL-2.0+
*
* Source partly derived from:
* linux/drivers/char/pc_keyb.c
*/
#include <common.h>
#include <console.h>
#include <asm/processor.h>
#include <stdio_dev.h>
#include "isa.h"
#include "kbd.h"
unsigned char kbd_read_status(void);
unsigned char kbd_read_input(void);
void kbd_send_data(unsigned char data);
void disable_8259A_irq(unsigned int irq);
void enable_8259A_irq(unsigned int irq);
/* used only by send_data - set by keyboard_interrupt */
#undef KBG_DEBUG
#ifdef KBG_DEBUG
#define PRINTF(fmt,args...) printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif
#define KBD_STAT_KOBF 0x01
#define KBD_STAT_IBF 0x02
#define KBD_STAT_SYS 0x04
#define KBD_STAT_CD 0x08
#define KBD_STAT_LOCK 0x10
#define KBD_STAT_MOBF 0x20
#define KBD_STAT_TI_OUT 0x40
#define KBD_STAT_PARERR 0x80
#define KBD_INIT_TIMEOUT 1000 /* Timeout in ms for initializing the keyboard */
#define KBC_TIMEOUT 250 /* Timeout in ms for sending to keyboard controller */
#define KBD_TIMEOUT 2000 /* Timeout in ms for keyboard command acknowledge */
/*
* Keyboard Controller Commands
*/
#define KBD_CCMD_READ_MODE 0x20 /* Read mode bits */
#define KBD_CCMD_WRITE_MODE 0x60 /* Write mode bits */
#define KBD_CCMD_GET_VERSION 0xA1 /* Get controller version */
#define KBD_CCMD_MOUSE_DISABLE 0xA7 /* Disable mouse interface */
#define KBD_CCMD_MOUSE_ENABLE 0xA8 /* Enable mouse interface */
#define KBD_CCMD_TEST_MOUSE 0xA9 /* Mouse interface test */
#define KBD_CCMD_SELF_TEST 0xAA /* Controller self test */
#define KBD_CCMD_KBD_TEST 0xAB /* Keyboard interface test */
#define KBD_CCMD_KBD_DISABLE 0xAD /* Keyboard interface disable */
#define KBD_CCMD_KBD_ENABLE 0xAE /* Keyboard interface enable */
#define KBD_CCMD_WRITE_AUX_OBUF 0xD3 /* Write to output buffer as if
initiated by the auxiliary device */
#define KBD_CCMD_WRITE_MOUSE 0xD4 /* Write the following byte to the mouse */
/*
* Keyboard Commands
*/
#define KBD_CMD_SET_LEDS 0xED /* Set keyboard leds */
#define KBD_CMD_SET_RATE 0xF3 /* Set typematic rate */
#define KBD_CMD_ENABLE 0xF4 /* Enable scanning */
#define KBD_CMD_DISABLE 0xF5 /* Disable scanning */
#define KBD_CMD_RESET 0xFF /* Reset */
/*
* 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 the cmd again */
/*
* Status Register Bits
*/
#define KBD_STAT_OBF 0x01 /* Keyboard output buffer full */
#define KBD_STAT_IBF 0x02 /* Keyboard input buffer full */
#define KBD_STAT_SELFTEST 0x04 /* Self test successful */
#define KBD_STAT_CMD 0x08 /* Last write was a command write (0=data) */
#define KBD_STAT_UNLOCKED 0x10 /* Zero if keyboard locked */
#define KBD_STAT_MOUSE_OBF 0x20 /* Mouse output buffer full */
#define KBD_STAT_GTO 0x40 /* General receive/xmit timeout */
#define KBD_STAT_PERR 0x80 /* Parity error */
#define AUX_STAT_OBF (KBD_STAT_OBF | KBD_STAT_MOUSE_OBF)
/*
* Controller Mode Register Bits
*/
#define KBD_MODE_KBD_INT 0x01 /* Keyboard data generate IRQ1 */
#define KBD_MODE_MOUSE_INT 0x02 /* Mouse data generate IRQ12 */
#define KBD_MODE_SYS 0x04 /* The system flag (?) */
#define KBD_MODE_NO_KEYLOCK 0x08 /* The keylock doesn't affect the keyboard if set */
#define KBD_MODE_DISABLE_KBD 0x10 /* Disable keyboard interface */
#define KBD_MODE_DISABLE_MOUSE 0x20 /* Disable mouse interface */
#define KBD_MODE_KCC 0x40 /* Scan code conversion to PC format */
#define KBD_MODE_RFU 0x80
#define KDB_DATA_PORT 0x60
#define KDB_COMMAND_PORT 0x64
#define LED_SCR 0x01 /* scroll lock led */
#define LED_CAP 0x04 /* caps lock led */
#define LED_NUM 0x02 /* num lock led */
#define KBD_BUFFER_LEN 0x20 /* size of the keyboardbuffer */
static volatile char kbd_buffer[KBD_BUFFER_LEN];
static volatile int in_pointer = 0;
static volatile int out_pointer = 0;
static unsigned char num_lock = 0;
static unsigned char caps_lock = 0;
static unsigned char scroll_lock = 0;
static unsigned char shift = 0;
static unsigned char ctrl = 0;
static unsigned char alt = 0;
static unsigned char e0 = 0;
static unsigned char leds = 0;
#define DEVNAME "kbd"
/* Simple translation table for the keys */
static unsigned char kbd_plain_xlate[] = {
0xff,0x1b, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=','\b','\t', /* 0x00 - 0x0f */
'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']','\r',0xff, 'a', 's', /* 0x10 - 0x1f */
'd', 'f', 'g', 'h', 'j', 'k', 'l', ';','\'', '`',0xff,'\\', 'z', 'x', 'c', 'v', /* 0x20 - 0x2f */
'b', 'n', 'm', ',', '.', '/',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff, /* 0x30 - 0x3f */
0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
'2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x50 - 0x5F */
'\r',0xff,0xff
};
static unsigned char kbd_shift_xlate[] = {
0xff,0x1b, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+','\b','\t', /* 0x00 - 0x0f */
'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}','\r',0xff, 'A', 'S', /* 0x10 - 0x1f */
'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~',0xff, '|', 'Z', 'X', 'C', 'V', /* 0x20 - 0x2f */
'B', 'N', 'M', '<', '>', '?',0xff,0xff,0xff, ' ',0xff,0xff,0xff,0xff,0xff,0xff, /* 0x30 - 0x3f */
0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
'2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x50 - 0x5F */
'\r',0xff,0xff
};
static unsigned char kbd_ctrl_xlate[] = {
0xff,0x1b, '1',0x00, '3', '4', '5',0x1E, '7', '8', '9', '0',0x1F, '=','\b','\t', /* 0x00 - 0x0f */
0x11,0x17,0x05,0x12,0x14,0x18,0x15,0x09,0x0f,0x10,0x1b,0x1d,'\n',0xff,0x01,0x13, /* 0x10 - 0x1f */
0x04,0x06,0x08,0x09,0x0a,0x0b,0x0c, ';','\'', '~',0x00,0x1c,0x1a,0x18,0x03,0x16, /* 0x20 - 0x2f */
0x02,0x0e,0x0d, '<', '>', '?',0xff,0xff,0xff,0x00,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x30 - 0x3f */
0xff,0xff,0xff,0xff,0xff,0xff,0xff, '7', '8', '9', '-', '4', '5', '6', '+', '1', /* 0x40 - 0x4f */
'2', '3', '0', '.',0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff, /* 0x50 - 0x5F */
'\r',0xff,0xff
};
/******************************************************************
* Init
******************************************************************/
int isa_kbd_init(void)
{
char* result;
result=kbd_initialize();
if(result==NULL) {
PRINTF("AT Keyboard initialized\n");
irq_install_handler(25, (interrupt_handler_t *)handle_isa_int, NULL);
isa_irq_install_handler(KBD_INTERRUPT, (interrupt_handler_t *)kbd_interrupt, NULL);
return (1);
} else {
printf("%s\n",result);
return (-1);
}
}
#ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
extern int overwrite_console (void);
#else
int overwrite_console (void)
{
return (0);
}
#endif
int drv_isa_kbd_init (void)
{
int error;
struct stdio_dev kbddev ;
char *stdinname = getenv ("stdin");
if(isa_kbd_init()==-1)
return -1;
memset (&kbddev, 0, sizeof(kbddev));
strcpy(kbddev.name, DEVNAME);
kbddev.flags = DEV_FLAGS_INPUT;
kbddev.getc = kbd_getc ;
kbddev.tstc = kbd_testc ;
error = stdio_register (&kbddev);
if(error==0) {
/* check if this is the standard input device */
if(strcmp(stdinname,DEVNAME)==0) {
/* reassign the console */
if(overwrite_console()) {
return 1;
}
error=console_assign(stdin,DEVNAME);
if(error==0)
return 1;
else
return error;
}
return 1;
}
return error;
}
/******************************************************************
* Queue handling
******************************************************************/
/* puts character in the queue and sets up the in and out pointer */
void kbd_put_queue(char data)
{
if((in_pointer+1)==KBD_BUFFER_LEN) {
if(out_pointer==0) {
return; /* buffer full */
} else{
in_pointer=0;
}
} else {
if((in_pointer+1)==out_pointer)
return; /* buffer full */
in_pointer++;
}
kbd_buffer[in_pointer]=data;
return;
}
/* test if a character is in the queue */
int kbd_testc(struct stdio_dev *dev)
{
if(in_pointer==out_pointer)
return(0); /* no data */
else
return(1);
}
/* gets the character from the queue */
int kbd_getc(struct stdio_dev *dev)
{
char c;
while(in_pointer==out_pointer);
if((out_pointer+1)==KBD_BUFFER_LEN)
out_pointer=0;
else
out_pointer++;
c=kbd_buffer[out_pointer];
return (int)c;
}
/* set LEDs */
void kbd_set_leds(void)
{
if(caps_lock==0)
leds&=~LED_CAP; /* switch caps_lock off */
else
leds|=LED_CAP; /* switch on LED */
if(num_lock==0)
leds&=~LED_NUM; /* switch LED off */
else
leds|=LED_NUM; /* switch on LED */
if(scroll_lock==0)
leds&=~LED_SCR; /* switch LED off */
else
leds|=LED_SCR; /* switch on LED */
kbd_send_data(KBD_CMD_SET_LEDS);
kbd_send_data(leds);
}
void handle_keyboard_event (unsigned char scancode)
{
unsigned char keycode;
/* Convert scancode to keycode */
PRINTF ("scancode %x\n", scancode);
if (scancode == 0xe0) {
e0 = 1; /* special charakters */
return;
}
if (e0 == 1) {
e0 = 0; /* delete flag */
if (!(((scancode & 0x7F) == 0x38) || /* the right ctrl key */
((scancode & 0x7F) == 0x1D) || /* the right alt key */
((scancode & 0x7F) == 0x35) || /* the right '/' key */
((scancode & 0x7F) == 0x1C)))
/* the right enter key */
/* we swallow unknown e0 codes */
return;
}
/* special cntrl keys */
switch (scancode) {
case 0x2A:
case 0x36: /* shift pressed */
shift = 1;
return; /* do nothing else */
case 0xAA:
case 0xB6: /* shift released */
shift = 0;
return; /* do nothing else */
case 0x38: /* alt pressed */
alt = 1;
return; /* do nothing else */
case 0xB8: /* alt released */
alt = 0;
return; /* do nothing else */
case 0x1d: /* ctrl pressed */
ctrl = 1;
return; /* do nothing else */
case 0x9d: /* ctrl released */
ctrl = 0;
return; /* do nothing else */
case 0x46: /* scrollock pressed */
scroll_lock = ~scroll_lock;
kbd_set_leds ();
return; /* do nothing else */
case 0x3A: /* capslock pressed */
caps_lock = ~caps_lock;
kbd_set_leds ();
return;
case 0x45: /* numlock pressed */
num_lock = ~num_lock;
kbd_set_leds ();
return;
case 0xC6: /* scroll lock released */
case 0xC5: /* num lock released */
case 0xBA: /* caps lock released */
return; /* just swallow */
}
if ((scancode & 0x80) == 0x80) /* key released */
return;
/* now, decide which table we need */
if (scancode > (sizeof (kbd_plain_xlate) / sizeof (kbd_plain_xlate[0]))) { /* scancode not in list */
PRINTF ("unkown scancode %X\n", scancode);
return; /* swallow it */
}
/* setup plain code first */
keycode = kbd_plain_xlate[scancode];
if (caps_lock == 1) { /* caps_lock is pressed, overwrite plain code */
if (scancode > (sizeof (kbd_shift_xlate) / sizeof (kbd_shift_xlate[0]))) { /* scancode not in list */
PRINTF ("unkown caps-locked scancode %X\n", scancode);
return; /* swallow it */
}
keycode = kbd_shift_xlate[scancode];
if (keycode < 'A') { /* we only want the alphas capital */
keycode = kbd_plain_xlate[scancode];
}
}
if (shift == 1) { /* shift overwrites caps_lock */
if (scancode > (sizeof (kbd_shift_xlate) / sizeof (kbd_shift_xlate[0]))) { /* scancode not in list */
PRINTF ("unkown shifted scancode %X\n", scancode);
return; /* swallow it */
}
keycode = kbd_shift_xlate[scancode];
}
if (ctrl == 1) { /* ctrl overwrites caps_lock and shift */
if (scancode > (sizeof (kbd_ctrl_xlate) / sizeof (kbd_ctrl_xlate[0]))) { /* scancode not in list */
PRINTF ("unkown ctrl scancode %X\n", scancode);
return; /* swallow it */
}
keycode = kbd_ctrl_xlate[scancode];
}
/* check if valid keycode */
if (keycode == 0xff) {
PRINTF ("unkown scancode %X\n", scancode);
return; /* swallow unknown codes */
}
kbd_put_queue (keycode);
PRINTF ("%x\n", keycode);
}
/*
* This reads the keyboard status port, and does the
* appropriate action.
*
*/
unsigned char handle_kbd_event(void)
{
unsigned char status = kbd_read_status();
unsigned int work = 10000;
while ((--work > 0) && (status & KBD_STAT_OBF)) {
unsigned char scancode;
scancode = kbd_read_input();
/* Error bytes must be ignored to make the
Synaptics touchpads compaq use work */
/* Ignore error bytes */
if (!(status & (KBD_STAT_GTO | KBD_STAT_PERR)))
{
if (status & KBD_STAT_MOUSE_OBF)
; /* not supported: handle_mouse_event(scancode); */
else
handle_keyboard_event(scancode);
}
status = kbd_read_status();
}
if (!work)
PRINTF("pc_keyb: controller jammed (0x%02X).\n", status);
return status;
}
/******************************************************************************
* Lowlevel Part of keyboard section
*/
unsigned char kbd_read_status(void)
{
return(in8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_COMMAND_PORT));
}
unsigned char kbd_read_input(void)
{
return(in8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_DATA_PORT));
}
void kbd_write_command(unsigned char cmd)
{
out8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_COMMAND_PORT,cmd);
}
void kbd_write_output(unsigned char data)
{
out8(CONFIG_SYS_ISA_IO_BASE_ADDRESS + KDB_DATA_PORT, data);
}
int kbd_read_data(void)
{
int val;
unsigned char status;
val = -1;
status = kbd_read_status();
if (status & KBD_STAT_OBF) {
val = kbd_read_input();
if (status & (KBD_STAT_GTO | KBD_STAT_PERR))
val = -2;
}
return val;
}
int kbd_wait_for_input(void)
{
unsigned long timeout;
int val;
timeout = KBD_TIMEOUT;
val=kbd_read_data();
while(val < 0)
{
if(timeout--==0)
return -1;
udelay(1000);
val=kbd_read_data();
}
return val;
}
int kb_wait(void)
{
unsigned long timeout = KBC_TIMEOUT * 10;
do {
unsigned char status = handle_kbd_event();
if (!(status & KBD_STAT_IBF))
return 0; /* ok */
udelay(1000);
timeout--;
} while (timeout);
return 1;
}
void kbd_write_command_w(int data)
{
if(kb_wait())
PRINTF("timeout in kbd_write_command_w\n");
kbd_write_command(data);
}
void kbd_write_output_w(int data)
{
if(kb_wait())
PRINTF("timeout in kbd_write_output_w\n");
kbd_write_output(data);
}
void kbd_send_data(unsigned char data)
{
unsigned char status;
disable_8259A_irq(1); /* disable interrupt */
kbd_write_output_w(data);
status = kbd_wait_for_input();
if (status == KBD_REPLY_ACK)
enable_8259A_irq(1); /* enable interrupt */
}
char * kbd_initialize(void)
{
int status;
in_pointer = 0; /* delete in Buffer */
out_pointer = 0;
/*
* Test the keyboard interface.
* This seems to be the only way to get it going.
* If the test is successful a x55 is placed in the input buffer.
*/
kbd_write_command_w(KBD_CCMD_SELF_TEST);
if (kbd_wait_for_input() != 0x55)
return "Kbd: failed self test";
/*
* Perform a keyboard interface test. This causes the controller
* to test the keyboard clock and data lines. The results of the
* test are placed in the input buffer.
*/
kbd_write_command_w(KBD_CCMD_KBD_TEST);
if (kbd_wait_for_input() != 0x00)
return "Kbd: interface failed self test";
/*
* Enable the keyboard by allowing the keyboard clock to run.
*/
kbd_write_command_w(KBD_CCMD_KBD_ENABLE);
status = kbd_wait_for_input();
/*
* Reset keyboard. If the read times out
* then the assumption is that no keyboard is
* plugged into the machine.
* This defaults the keyboard to scan-code set 2.
*
* Set up to try again if the keyboard asks for RESEND.
*/
do {
kbd_write_output_w(KBD_CMD_RESET);
status = kbd_wait_for_input();
if (status == KBD_REPLY_ACK)
break;
if (status != KBD_REPLY_RESEND) {
PRINTF("status: %X\n",status);
return "Kbd: reset failed, no ACK";
}
} while (1);
if (kbd_wait_for_input() != KBD_REPLY_POR)
return "Kbd: reset failed, no POR";
/*
* Set keyboard controller mode. During this, the keyboard should be
* in the disabled state.
*
* Set up to try again if the keyboard asks for RESEND.
*/
do {
kbd_write_output_w(KBD_CMD_DISABLE);
status = kbd_wait_for_input();
if (status == KBD_REPLY_ACK)
break;
if (status != KBD_REPLY_RESEND)
return "Kbd: disable keyboard: no ACK";
} while (1);
kbd_write_command_w(KBD_CCMD_WRITE_MODE);
kbd_write_output_w(KBD_MODE_KBD_INT
| KBD_MODE_SYS
| KBD_MODE_DISABLE_MOUSE
| KBD_MODE_KCC);
/* AMCC powerpc portables need this to use scan-code set 1 -- Cort */
kbd_write_command_w(KBD_CCMD_READ_MODE);
if (!(kbd_wait_for_input() & KBD_MODE_KCC)) {
/*
* If the controller does not support conversion,
* Set the keyboard to scan-code set 1.
*/
kbd_write_output_w(0xF0);
kbd_wait_for_input();
kbd_write_output_w(0x01);
kbd_wait_for_input();
}
kbd_write_output_w(KBD_CMD_ENABLE);
if (kbd_wait_for_input() != KBD_REPLY_ACK)
return "Kbd: enable keyboard: no ACK";
/*
* Finally, set the typematic rate to maximum.
*/
kbd_write_output_w(KBD_CMD_SET_RATE);
if (kbd_wait_for_input() != KBD_REPLY_ACK)
return "Kbd: Set rate: no ACK";
kbd_write_output_w(0x00);
if (kbd_wait_for_input() != KBD_REPLY_ACK)
return "Kbd: Set rate: no ACK";
return NULL;
}
void kbd_interrupt(void)
{
handle_kbd_event();
}