From eb11df472d8491fcb28534b59017e1b5465997fa Mon Sep 17 00:00:00 2001 From: Wu Zhangjin Date: Mon, 4 Jan 2010 17:16:48 +0800 Subject: [PATCH] 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 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 --- arch/mips/include/asm/mach-loongson/loongson.h | 2 +- arch/mips/loongson/common/env.c | 25 +++++++++++++++++++++---- 2 files changed, 22 insertions(+), 5 deletions(-) diff --git a/arch/mips/include/asm/mach-loongson/loongson.h b/arch/mips/include/asm/mach-loongson/loongson.h index ee8bc83..a6eac0f 100644 --- a/arch/mips/include/asm/mach-loongson/loongson.h +++ b/arch/mips/include/asm/mach-loongson/loongson.h @@ -23,7 +23,7 @@ extern void mach_prepare_reboot(void); extern void mach_prepare_shutdown(void); /* environment arguments from bootloader */ -extern unsigned long bus_clock, cpu_clock_freq; +extern unsigned long cpu_clock_freq; extern unsigned long memsize, highmemsize; /* loongson-specific command line, env and memory initialization */ diff --git a/arch/mips/loongson/common/env.c b/arch/mips/loongson/common/env.c index 196d947..8c01df5 100644 --- a/arch/mips/loongson/common/env.c +++ b/arch/mips/loongson/common/env.c @@ -23,13 +23,10 @@ #include -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); -- 2.7.4