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mach-ux500: register a clock for the SMP TWD

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The SMP TWD on the ux500 will change frequency at the same time as
the CPU. Loop back the frequency presented from the CPU into a
clock that is looked up by the SMP TWD driver with the new cpufreq
notifier hook.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2011-06-01 14:44:16 +02:00
parent 32d55ff916
commit ef7a474cef
1 changed files with 48 additions and 0 deletions
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48
arch/arm/mach-ux500/clock.c
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@ -14,6 +14,7 @@
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/clkdev.h>
#include <linux/cpufreq.h>
#include <plat/mtu.h>
#include <mach/hardware.h>
@ -759,6 +760,51 @@ err_out:
late_initcall(clk_debugfs_init);
#endif /* defined(CONFIG_DEBUG_FS) */
unsigned long clk_smp_twd_rate = 400000000;
unsigned long clk_smp_twd_get_rate(struct clk *clk)
{
return clk_smp_twd_rate;
}
static struct clk clk_smp_twd = {
.get_rate = clk_smp_twd_get_rate,
.name = "smp_twd",
};
static struct clk_lookup clk_smp_twd_lookup = {
.dev_id = "smp_twd",
.clk = &clk_smp_twd,
};
#ifdef CONFIG_CPU_FREQ
static int clk_twd_cpufreq_transition(struct notifier_block *nb,
unsigned long state, void *data)
{
struct cpufreq_freqs *f = data;
if (state == CPUFREQ_PRECHANGE) {
/* Save frequency in simple Hz */
clk_smp_twd_rate = f->new * 1000;
}
return NOTIFY_OK;
}
static struct notifier_block clk_twd_cpufreq_nb = {
.notifier_call = clk_twd_cpufreq_transition,
};
static int clk_init_smp_twd_cpufreq(void)
{
return cpufreq_register_notifier(&clk_twd_cpufreq_nb,
CPUFREQ_TRANSITION_NOTIFIER);
}
late_initcall(clk_init_smp_twd_cpufreq);
#endif
int __init clk_init(void)
{
if (cpu_is_u8500ed()) {
@ -779,6 +825,8 @@ int __init clk_init(void)
else
clkdev_add_table(u8500_v1_clks, ARRAY_SIZE(u8500_v1_clks));
clkdev_add(&clk_smp_twd_lookup);
#ifdef CONFIG_DEBUG_FS
clk_debugfs_add_table(u8500_common_clks, ARRAY_SIZE(u8500_common_clks));
if (cpu_is_u8500ed())