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authorWu Zhangjin <wuzhangjin@gmail.com>2010-01-04 17:16:48 +0800
committerRalf Baechle <ralf@linux-mips.org>2010-02-27 12:53:11 +0100
commiteb11df472d8491fcb28534b59017e1b5465997fa (patch)
tree019fe0166af774fffe0227b42546463a326e144e /arch/mips/loongson
parent97e6a89634befaf5bd66d3044d36961c887cd98c (diff)
MIPS: Loongson: Cleanup of the environment variables
Changes: o Move bus_clock into prom_init_env() o Initialize the cpu_clock_freq to the default values for the correspoding processor revisions if no such environment variable passed by BIOS/Bootloader. Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Cc: linux-mips@linux-mips.org Cc: yanh@lemote.com Cc: huhb@lemote.com Cc: zhangfx@lemote.com Patchwork: http://patchwork.linux-mips.org/patch/826/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/loongson')
-rw-r--r--arch/mips/loongson/common/env.c25
1 files changed, 21 insertions, 4 deletions
diff --git a/arch/mips/loongson/common/env.c b/arch/mips/loongson/common/env.c
index 196d947d929..8c01df5758a 100644
--- a/arch/mips/loongson/common/env.c
+++ b/arch/mips/loongson/common/env.c
@@ -23,13 +23,10 @@
#include <loongson.h>
-unsigned long bus_clock, cpu_clock_freq;
+unsigned long cpu_clock_freq;
EXPORT_SYMBOL(cpu_clock_freq);
unsigned long memsize, highmemsize;
-/* pmon passes arguments in 32bit pointers */
-int *_prom_envp;
-
#define parse_even_earlier(res, option, p) \
do { \
if (strncmp(option, (char *)p, strlen(option)) == 0) \
@@ -39,6 +36,10 @@ do { \
void __init prom_init_env(void)
{
+ /* pmon passes arguments in 32bit pointers */
+ int *_prom_envp;
+ unsigned long bus_clock;
+ unsigned int processor_id;
long l;
/* firmware arguments are initialized in head.S */
@@ -55,6 +56,22 @@ void __init prom_init_env(void)
}
if (memsize == 0)
memsize = 256;
+ if (bus_clock == 0)
+ bus_clock = 66000000;
+ if (cpu_clock_freq == 0) {
+ processor_id = (&current_cpu_data)->processor_id;
+ switch (processor_id & PRID_REV_MASK) {
+ case PRID_REV_LOONGSON2E:
+ cpu_clock_freq = 533080000;
+ break;
+ case PRID_REV_LOONGSON2F:
+ cpu_clock_freq = 797000000;
+ break;
+ default:
+ cpu_clock_freq = 100000000;
+ break;
+ }
+ }
pr_info("busclock=%ld, cpuclock=%ld, memsize=%ld, highmemsize=%ld\n",
bus_clock, cpu_clock_freq, memsize, highmemsize);