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| author | Paul Mundt <lethal@linux-sh.org> | 2008-09-08 13:47:42 +0200 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2008-09-08 13:47:42 +0200 |
| commit | cf204fa797cf968de8043491cd469ad0321d0940 (patch) | |
| tree | 0faa7e866c1ce490973d61a5d1e277ee47ab3c54 /arch/sh/kernel/setup.c | |
| parent | sh: kprobes: __kprobes annotations and formatting cleanups. (diff) | |
| download | linux-cf204fa797cf968de8043491cd469ad0321d0940.tar.xz linux-cf204fa797cf968de8043491cd469ad0321d0940.zip | |
sh: Derive calibrate_delay lpj from clk fwk.
All CPUs must have a sensible cpu_clk definition these days, which we can
safely use for deriving the preset loops_per_jiffy. The only odd one out
is SH-5, which hasn't been hammered in to the framework yet.
Based on the ST patch.
Signed-off-by: Francesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: Carl Shaw <carl.shaw@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/kernel/setup.c')
| -rw-r--r-- | arch/sh/kernel/setup.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c index fc098c8af052..267b344099c0 100644 --- a/arch/sh/kernel/setup.c +++ b/arch/sh/kernel/setup.c @@ -27,6 +27,8 @@ #include <linux/debugfs.h> #include <linux/crash_dump.h> #include <linux/mmzone.h> +#include <linux/clk.h> +#include <linux/delay.h> #include <asm/uaccess.h> #include <asm/io.h> #include <asm/page.h> @@ -180,6 +182,24 @@ static inline void __init reserve_crashkernel(void) {} #endif +#ifndef CONFIG_GENERIC_CALIBRATE_DELAY +void __cpuinit calibrate_delay(void) +{ + struct clk *clk = clk_get(NULL, "cpu_clk"); + + if (IS_ERR(clk)) + panic("Need a sane CPU clock definition!"); + + loops_per_jiffy = (clk_get_rate(clk) >> 1) / HZ; + + printk(KERN_INFO "Calibrating delay loop (skipped)... " + "%lu.%02lu BogoMIPS PRESET (lpj=%lu)\n", + loops_per_jiffy/(500000/HZ), + (loops_per_jiffy/(5000/HZ)) % 100, + loops_per_jiffy); +} +#endif + void __init __add_active_range(unsigned int nid, unsigned long start_pfn, unsigned long end_pfn) { |