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authorPaul Mundt <lethal@linux-sh.org>2008-09-08 20:47:42 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-09-08 20:47:42 +0900
commitcf204fa797cf968de8043491cd469ad0321d0940 (patch)
tree0faa7e866c1ce490973d61a5d1e277ee47ab3c54 /arch/sh/kernel
parent4eb5845d6cbdb9bf03f563c22f3a54115121858f (diff)
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')
-rw-r--r--arch/sh/kernel/setup.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index fc098c8af05..267b344099c 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)
{