9b54dc5869
Signed-off-by: Yoichi Yuasa <yuasa@linux-mips.org> Cc: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/813/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
129 lines
3.4 KiB
C
129 lines
3.4 KiB
C
/*
|
|
* Copyright (C) 1999, 2000, 2004, 2005 MIPS Technologies, Inc.
|
|
* All rights reserved.
|
|
* Authors: Carsten Langgaard <carstenl@mips.com>
|
|
* Maciej W. Rozycki <macro@mips.com>
|
|
* Portions copyright (C) 2009 Cisco Systems, Inc.
|
|
*
|
|
* 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.
|
|
*
|
|
* PROM library initialisation code.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include <asm/bootinfo.h>
|
|
#include <linux/io.h>
|
|
#include <asm/system.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/traps.h>
|
|
|
|
#include <asm/mips-boards/prom.h>
|
|
#include <asm/mips-boards/generic.h>
|
|
#include <asm/mach-powertv/asic.h>
|
|
|
|
static int *_prom_envp;
|
|
unsigned long _prom_memsize;
|
|
|
|
/*
|
|
* YAMON (32-bit PROM) pass arguments and environment as 32-bit pointer.
|
|
* This macro take care of sign extension, if running in 64-bit mode.
|
|
*/
|
|
#define prom_envp(index) ((char *)(long)_prom_envp[(index)])
|
|
|
|
char *prom_getenv(char *envname)
|
|
{
|
|
char *result = NULL;
|
|
|
|
if (_prom_envp != NULL) {
|
|
/*
|
|
* Return a pointer to the given environment variable.
|
|
* In 64-bit mode: we're using 64-bit pointers, but all pointers
|
|
* in the PROM structures are only 32-bit, so we need some
|
|
* workarounds, if we are running in 64-bit mode.
|
|
*/
|
|
int i, index = 0;
|
|
|
|
i = strlen(envname);
|
|
|
|
while (prom_envp(index)) {
|
|
if (strncmp(envname, prom_envp(index), i) == 0) {
|
|
result = prom_envp(index + 1);
|
|
break;
|
|
}
|
|
index += 2;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* TODO: Verify on linux-mips mailing list that the following two */
|
|
/* functions are correct */
|
|
/* TODO: Copy NMI and EJTAG exception vectors to memory from the */
|
|
/* BootROM exception vectors. Flush their cache entries. test it. */
|
|
|
|
static void __init mips_nmi_setup(void)
|
|
{
|
|
void *base;
|
|
#if defined(CONFIG_CPU_MIPS32_R1)
|
|
base = cpu_has_veic ?
|
|
(void *)(CAC_BASE + 0xa80) :
|
|
(void *)(CAC_BASE + 0x380);
|
|
#elif defined(CONFIG_CPU_MIPS32_R2)
|
|
base = (void *)0xbfc00000;
|
|
#else
|
|
#error NMI exception handler address not defined
|
|
#endif
|
|
}
|
|
|
|
static void __init mips_ejtag_setup(void)
|
|
{
|
|
void *base;
|
|
|
|
#if defined(CONFIG_CPU_MIPS32_R1)
|
|
base = cpu_has_veic ?
|
|
(void *)(CAC_BASE + 0xa00) :
|
|
(void *)(CAC_BASE + 0x300);
|
|
#elif defined(CONFIG_CPU_MIPS32_R2)
|
|
base = (void *)0xbfc00480;
|
|
#else
|
|
#error EJTAG exception handler address not defined
|
|
#endif
|
|
}
|
|
|
|
void __init prom_init(void)
|
|
{
|
|
int prom_argc;
|
|
char *prom_argv;
|
|
|
|
prom_argc = fw_arg0;
|
|
prom_argv = (char *) fw_arg1;
|
|
_prom_envp = (int *) fw_arg2;
|
|
_prom_memsize = (unsigned long) fw_arg3;
|
|
|
|
board_nmi_handler_setup = mips_nmi_setup;
|
|
board_ejtag_handler_setup = mips_ejtag_setup;
|
|
|
|
if (prom_argc == 1)
|
|
strlcat(arcs_cmdline, prom_argv, COMMAND_LINE_SIZE);
|
|
|
|
configure_platform();
|
|
prom_meminit();
|
|
|
|
#ifndef CONFIG_BOOTLOADER_DRIVER
|
|
pr_info("\nBootloader driver isn't loaded...\n");
|
|
#endif
|
|
}
|