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| author | Wu Zhangjin <wuzhangjin@gmail.com> | 2010-01-04 17:16:48 +0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2010-02-27 12:53:11 +0100 |
| commit | eb11df472d8491fcb28534b59017e1b5465997fa (patch) | |
| tree | 019fe0166af774fffe0227b42546463a326e144e /arch/mips/loongson | |
| parent | 97e6a89634befaf5bd66d3044d36961c887cd98c (diff) | |
| download | lwn-eb11df472d8491fcb28534b59017e1b5465997fa.tar.gz lwn-eb11df472d8491fcb28534b59017e1b5465997fa.zip | |
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.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/arch/mips/loongson/common/env.c b/arch/mips/loongson/common/env.c index 196d947d929a..8c01df5758a9 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 = (¤t_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); |