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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>
This commit is contained in:
Paul Mundt 2008-09-08 20:47:42 +09:00
parent 4eb5845d6c
commit cf204fa797
2 changed files with 22 additions and 1 deletions
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3
arch/sh/Kconfig
View File

@ -25,6 +25,7 @@ config SUPERH32
config SUPERH64
def_bool y if CPU_SH5
select GENERIC_CALIBRATE_DELAY
config ARCH_DEFCONFIG
string
@ -57,7 +58,7 @@ config GENERIC_IRQ_PROBE
def_bool y
config GENERIC_CALIBRATE_DELAY
def_bool y
bool
config GENERIC_IOMAP
bool

20
arch/sh/kernel/setup.c
View File

@ -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)
{