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/*
* avr.c
*
* AVR functions
*
* Copyright (C) 2006 Mihai Georgian <u-boot@linuxnotincluded.org.uk>
*
* 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; either version 2 of
* the License, or (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <ns16550.h>
#include <console.h>
/* Button codes from the AVR */
#define PWRR 0x20 /* Power button release */
#define PWRP 0x21 /* Power button push */
#define RESR 0x22 /* Reset button release */
#define RESP 0x23 /* Reset button push */
#define AVRINIT 0x33 /* Init complete */
#define AVRRESET 0x31 /* Reset request */
/* LED commands */
#define PWRBLINKSTRT '[' /* Blink power LED */
#define PWRBLINKSTOP 'Z' /* Solid power LED */
#define HDDLEDON 'W' /* HDD LED on */
#define HDDLEDOFF 'V' /* HDD LED off */
#define HDDBLINKSTRT 'Y' /* HDD LED start blink */
#define HDDBLINKSTOP 'X' /* HDD LED stop blink */
/* Timings for LEDs blinking to show choice */
#define PULSETIME 250 /* msecs */
#define LONGPAUSE (5 * PULSETIME)
/* Button press times */
#define PUSHHOLD 1000 /* msecs */
#define NOBUTTON (6 * (LONGPAUSE+PULSETIME))
/* Boot and console choices */
#define MAX_BOOT_CHOICE 3
static char *consoles[] = {
"serial",
#if defined(CONFIG_NETCONSOLE)
"nc",
#endif
};
#define MAX_CONS_CHOICE (sizeof(consoles)/sizeof(char *))
#if !defined(CONFIG_NETCONSOLE)
#define DEF_CONS_CHOICE 0
#else
#define DEF_CONS_CHOICE 1
#endif
#define perror(fmt, args...) printf("%s: " fmt, __FUNCTION__ , ##args)
extern void miconCntl_SendCmd(unsigned char dat);
extern void miconCntl_DisWDT(void);
static int boot_stop;
static int boot_choice = 1;
static int cons_choice = DEF_CONS_CHOICE;
static char envbuffer[16];
void init_AVR_DUART (void)
{
NS16550_t AVR_port = (NS16550_t) CFG_NS16550_COM2;
int clock_divisor = CFG_NS16550_CLK / 16 / 9600;
/*
* AVR port init sequence taken from
* the original Linkstation init code
* Normal U-Boot serial reinit doesn't
* work because the AVR uses even parity
*/
AVR_port->lcr = 0x00;
AVR_port->ier = 0x00;
AVR_port->lcr = LCR_BKSE;
AVR_port->dll = clock_divisor & 0xff;
AVR_port->dlm = (clock_divisor >> 8) & 0xff;
AVR_port->lcr = LCR_WLS_8 | LCR_PEN | LCR_EPS;
AVR_port->mcr = 0x00;
AVR_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;
miconCntl_DisWDT();
boot_stop = 0;
miconCntl_SendCmd(PWRBLINKSTRT);
}
static inline int avr_tstc(void)
{
return (NS16550_tstc((NS16550_t)CFG_NS16550_COM2));
}
static inline char avr_getc(void)
{
return (NS16550_getc((NS16550_t)CFG_NS16550_COM2));
}
static int push_timeout(char button_code)
{
ulong push_start = get_timer(0);
while (get_timer(push_start) <= PUSHHOLD)
if (avr_tstc() && avr_getc() == button_code)
return 0;
return 1;
}
static void next_boot_choice(void)
{
ulong return_start;
ulong pulse_start;
int on_times;
int button_on;
int led_state;
char c;
button_on = 0;
return_start = get_timer(0);
on_times = boot_choice;
led_state = 0;
miconCntl_SendCmd(HDDLEDOFF);
pulse_start = get_timer(0);
while (get_timer(return_start) <= NOBUTTON || button_on) {
if (avr_tstc()) {
c = avr_getc();
if (c == PWRP)
button_on = 1;
else if (c == PWRR) {
button_on = 0;
return_start = get_timer(0);
if (++boot_choice > MAX_BOOT_CHOICE)
boot_choice = 1;
sprintf(envbuffer, "bootcmd%d", boot_choice);
if (getenv(envbuffer)) {
sprintf(envbuffer, "run bootcmd%d", boot_choice);
setenv("bootcmd", envbuffer);
}
on_times = boot_choice;
led_state = 1;
miconCntl_SendCmd(HDDLEDON);
pulse_start = get_timer(0);
} else {
perror("Unexpected code: 0x%02X\n", c);
}
}
if (on_times && get_timer(pulse_start) > PULSETIME) {
if (led_state == 1) {
--on_times;
led_state = 0;
miconCntl_SendCmd(HDDLEDOFF);
} else {
led_state = 1;
miconCntl_SendCmd(HDDLEDON);
}
pulse_start = get_timer(0);
}
if (!on_times && get_timer(pulse_start) > LONGPAUSE) {
on_times = boot_choice;
led_state = 1;
miconCntl_SendCmd(HDDLEDON);
pulse_start = get_timer(0);
}
}
if (led_state)
miconCntl_SendCmd(HDDLEDOFF);
}
void next_cons_choice(int console)
{
ulong return_start;
ulong pulse_start;
int on_times;
int button_on;
int led_state;
char c;
button_on = 0;
cons_choice = console;
return_start = get_timer(0);
on_times = cons_choice+1;
led_state = 1;
miconCntl_SendCmd(HDDLEDON);
pulse_start = get_timer(0);
while (get_timer(return_start) <= NOBUTTON || button_on) {
if (avr_tstc()) {
c = avr_getc();
if (c == RESP)
button_on = 1;
else if (c == RESR) {
button_on = 0;
return_start = get_timer(0);
cons_choice = (cons_choice + 1) % MAX_CONS_CHOICE;
console_assign(stdin, consoles[cons_choice]);
console_assign(stdout, consoles[cons_choice]);
console_assign(stderr, consoles[cons_choice]);
on_times = cons_choice+1;
led_state = 0;
miconCntl_SendCmd(HDDLEDOFF);
pulse_start = get_timer(0);
} else {
perror("Unexpected code: 0x%02X\n", c);
}
}
if (on_times && get_timer(pulse_start) > PULSETIME) {
if (led_state == 0) {
--on_times;
led_state = 1;
miconCntl_SendCmd(HDDLEDON);
} else {
led_state = 0;
miconCntl_SendCmd(HDDLEDOFF);
}
pulse_start = get_timer(0);
}
if (!on_times && get_timer(pulse_start) > LONGPAUSE) {
on_times = cons_choice+1;
led_state = 0;
miconCntl_SendCmd(HDDLEDOFF);
pulse_start = get_timer(0);
}
}
if (led_state);
miconCntl_SendCmd(HDDLEDOFF);
}
int avr_input(void)
{
char avr_button;
if (!avr_tstc())
return 0;
avr_button = avr_getc();
switch (avr_button) {
case PWRP:
if (push_timeout(PWRR)) {
/* Timeout before power button release */
boot_stop = ~boot_stop;
if (boot_stop)
miconCntl_SendCmd(PWRBLINKSTOP);
else
miconCntl_SendCmd(PWRBLINKSTRT);
/* Wait for power button release */
while (avr_getc() != PWRR)
;
} else
/* Power button released */
next_boot_choice();
break;
case RESP:
/* Wait for Reset button release */
while (avr_getc() != RESR)
;
next_cons_choice(cons_choice);
break;
case AVRINIT:
return 0;
default:
perror("Unexpected code: 0x%02X\n", avr_button);
return 0;
}
if (boot_stop)
return (-3);
else
return (-2);
}
void avr_StopBoot(void)
{
boot_stop = ~0;
miconCntl_SendCmd(PWRBLINKSTOP);
}
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