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/*****************************************************************************
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved.
* Copyright (C) 2003 ADMtek Incorporated.
* daniell@admtek.com.tw
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope 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/autoconf.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <asm/bootinfo.h>
#include <asm/addrspace.h>
/* boot loaders specific definitions */
#define CFE_EPTSEAL 0x43464531
#define CFE 1
#define MYLOADER 2
#define UNKNOWN 0
void setup_prom_printf(int);
void prom_printf(char *, ...);
void prom_meminit(void);
/* we assume we don't know the boot loader by default */
int boot_loader_type = UNKNOWN;
#define ADM5120_ENVC 1
char *adm5120_envp[2*ADM5120_ENVC] = {"memsize","0x001000000"};
#define READCSR(r) *(volatile unsigned long *)(0xB2600000+(r))
#define WRITECSR(r,v) *(volatile unsigned long *)(0xB2600000+(r)) = v
#define UART_DR_REG 0x00
#define UART_FR_REG 0x18
#define UART_TX_FIFO_FULL 0x20
int putPromChar(char c)
{
WRITECSR(UART_DR_REG, c);
while ( (READCSR(UART_FR_REG) & UART_TX_FIFO_FULL) );
return 0;
}
/*
* Ugly prom_printf used for debugging
*/
void prom_printf(char *fmt, ...)
{
va_list args;
int l;
char *p, *buf_end;
char buf[1024];
va_start(args, fmt);
l = vsprintf(buf, fmt, args); /* hopefully i < sizeof(buf) */
va_end(args);
buf_end = buf + l;
for (p = buf; p < buf_end; p++) {
/* Crude cr/nl handling is better than none */
if (*p == '\n')
putPromChar('\r');
putPromChar(*p);
}
}
char *prom_getenv(char *envname)
{
int i, index=0;
i = strlen(envname);
printk(KERN_INFO "GETENV: envname is %s\n", envname);
while(index < (2*ADM5120_ENVC)) {
if(strncmp(envname, adm5120_envp[index], i) == 0) {
printk(KERN_INFO "GETENV: returning %s\n", adm5120_envp[index+1]);
return(adm5120_envp[index+1]);
}
index += 2;
}
printk(KERN_INFO "GETENV: not found.\n");
return(NULL);
}
/*
* initialize the prom module.
*/
void __init prom_init(void)
{
/* you should these macros defined in include/asm/bootinfo.h */
mips_machgroup = MACH_GROUP_ADM_GW;
mips_machtype = MACH_ADM_GW_5120;
/* init command line, register a default kernel command line */
strcpy(&(arcs_cmdline[0]), "console=ttyS0,115200 rootfstype=squashfs,jffs2 init=/etc/preinit");
/* check for CFE by finding the CFE magic number */
int *prom_vec = (int *) fw_arg3;
int argc = fw_arg0;
unsigned int cfe_eptseal;
if (argc < 0)
cfe_eptseal = (uint32_t)(unsigned long)prom_vec;
else {
if ((int32_t)(long)prom_vec < 0)
/*
* Old loaders all it gives us is the handle,
* so assume the seal.
*/
cfe_eptseal = CFE_EPTSEAL;
else
/*
* Newer loaders bundle the handle/ept/eptseal
*/
cfe_eptseal = (unsigned int)((uint32_t *)prom_vec)[3];
}
if (cfe_eptseal == CFE_EPTSEAL) {
boot_loader_type = CFE;
printk("adm5120 : CFE boot loader\n");
}
/* init memory map */
prom_meminit();
}
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