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/*
* Copyright (C) 2004, 2005 by Thomas Koeller (thomas.koeller@baslerweb.com)
* Based on the PMC-Sierra Yosemite board support by Ralf Baechle and
* Manish Lachwani.
*
* 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 <linux/init.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/smp.h>
#include <linux/module.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/reboot.h>
#include <asm/system.h>
#include <asm/bootinfo.h>
#include <asm/string.h>
#include <excite.h>
/* This struct is used by Redboot to pass arguments to the kernel */
typedef struct
{
char *name;
char *val;
} t_env_var;
struct parmblock {
t_env_var memsize;
t_env_var modetty0;
t_env_var ethaddr;
t_env_var env_end;
char *argv[2];
char text[0];
};
static unsigned int prom_argc;
static const char ** prom_argv;
static const t_env_var * prom_env;
static void prom_halt(void) __attribute__((noreturn));
static void prom_exit(void) __attribute__((noreturn));
const char *get_system_type(void)
{
return "Basler eXcite";
}
/*
* Halt the system
*/
static void prom_halt(void)
{
printk(KERN_NOTICE "\n** System halted.\n");
while (1)
asm volatile (
"\t.set\tmips3\n"
"\twait\n"
"\t.set\tmips0\n"
);
}
/*
* Reset the CPU and re-enter Redboot
*/
static void prom_exit(void)
{
unsigned int i;
volatile unsigned char * const flg =
(volatile unsigned char *) (EXCITE_ADDR_FPGA + EXCITE_FPGA_DPR);
/* Clear the watchdog reset flag, set the reboot flag */
*flg &= ~0x01;
*flg |= 0x80;
for (i = 0; i < 10; i++) {
*(volatile unsigned char *) (EXCITE_ADDR_FPGA + EXCITE_FPGA_SYSCTL) = 0x02;
iob();
mdelay(1000);
}
printk(KERN_NOTICE "Reset failed\n");
prom_halt();
}
static const char __init *prom_getenv(char *name)
{
const t_env_var * p;
for (p = prom_env; p->name != NULL; p++)
if(strcmp(name, p->name) == 0)
break;
return p->val;
}
/*
* Init routine which accepts the variables from Redboot
*/
void __init prom_init(void)
{
const struct parmblock * const pb = (struct parmblock *) fw_arg2;
prom_argc = fw_arg0;
prom_argv = (const char **) fw_arg1;
prom_env = &pb->memsize;
/* Callbacks for halt, restart */
_machine_restart = (void (*)(char *)) prom_exit;
_machine_halt = prom_halt;
#ifdef CONFIG_32BIT
/* copy command line */
strcpy(arcs_cmdline, prom_argv[1]);
memsize = simple_strtol(prom_getenv("memsize"), NULL, 16);
strcpy(modetty, prom_getenv("modetty0"));
#endif /* CONFIG_32BIT */
#ifdef CONFIG_64BIT
# error 64 bit support not implemented
#endif /* CONFIG_64BIT */
}
/* This is called from free_initmem(), so we need to provide it */
void __init prom_free_prom_memory(void)
{
/* Nothing to do */
}
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