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/*
* Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
*
* Modified from arch/mips/pnx833x/common/prom.c.
*
* 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.
*/
#include <linux/serial_reg.h>
#include <asm/bootinfo.h>
#include <loongson1.h>
#include <prom.h>
int prom_argc;
char **prom_argv, **prom_envp;
unsigned long memsize, highmemsize;
char *prom_getenv(char *envname)
{
char **env = prom_envp;
int i;
i = strlen(envname);
while (*env) {
if (strncmp(envname, *env, i) == 0 && *(*env+i) == '=')
return *env + i + 1;
env++;
}
return 0;
}
static inline unsigned long env_or_default(char *env, unsigned long dfl)
{
char *str = prom_getenv(env);
return str ? simple_strtol(str, 0, 0) : dfl;
}
void __init prom_init_cmdline(void)
{
char *c = &(arcs_cmdline[0]);
int i;
for (i = 1; i < prom_argc; i++) {
strcpy(c, prom_argv[i]);
c += strlen(prom_argv[i]);
if (i < prom_argc-1)
*c++ = ' ';
}
*c = 0;
}
void __init prom_init(void)
{
prom_argc = fw_arg0;
prom_argv = (char **)fw_arg1;
prom_envp = (char **)fw_arg2;
prom_init_cmdline();
memsize = env_or_default("memsize", DEFAULT_MEMSIZE);
highmemsize = env_or_default("highmemsize", 0x0);
}
void __init prom_free_prom_memory(void)
{
}
#define PORT(offset) (u8 *)(KSEG1ADDR(LS1X_UART0_BASE + offset))
void prom_putchar(char c)
{
int timeout;
timeout = 1024;
while (((readb(PORT(UART_LSR)) & UART_LSR_THRE) == 0)
&& (timeout-- > 0))
;
writeb(c, PORT(UART_TX));
}
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