summaryrefslogtreecommitdiff
path: root/arch/sh/kernel/cpufreq.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh/kernel/cpufreq.c')
-rw-r--r--arch/sh/kernel/cpufreq.c121
1 files changed, 82 insertions, 39 deletions
diff --git a/arch/sh/kernel/cpufreq.c b/arch/sh/kernel/cpufreq.c
index 0fffacea6ed..e68b45b6f3f 100644
--- a/arch/sh/kernel/cpufreq.c
+++ b/arch/sh/kernel/cpufreq.c
@@ -3,7 +3,7 @@
*
* cpufreq driver for the SuperH processors.
*
- * Copyright (C) 2002 - 2007 Paul Mundt
+ * Copyright (C) 2002 - 2012 Paul Mundt
* Copyright (C) 2002 M. R. Brown
*
* Clock framework bits from arch/avr32/mach-at32ap/cpufreq.c
@@ -14,6 +14,8 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
+#define pr_fmt(fmt) "cpufreq: " fmt
+
#include <linux/types.h>
#include <linux/cpufreq.h>
#include <linux/kernel.h>
@@ -21,15 +23,18 @@
#include <linux/init.h>
#include <linux/err.h>
#include <linux/cpumask.h>
+#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/sched.h> /* set_cpus_allowed() */
#include <linux/clk.h>
+#include <linux/percpu.h>
+#include <linux/sh_clk.h>
-static struct clk *cpuclk;
+static DEFINE_PER_CPU(struct clk, sh_cpuclk);
static unsigned int sh_cpufreq_get(unsigned int cpu)
{
- return (clk_get_rate(cpuclk) + 500) / 1000;
+ return (clk_get_rate(&per_cpu(sh_cpuclk, cpu)) + 500) / 1000;
}
/*
@@ -40,8 +45,10 @@ static int sh_cpufreq_target(struct cpufreq_policy *policy,
unsigned int relation)
{
unsigned int cpu = policy->cpu;
+ struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
cpumask_t cpus_allowed;
struct cpufreq_freqs freqs;
+ struct device *dev;
long freq;
if (!cpu_online(cpu))
@@ -52,13 +59,15 @@ static int sh_cpufreq_target(struct cpufreq_policy *policy,
BUG_ON(smp_processor_id() != cpu);
+ dev = get_cpu_device(cpu);
+
/* Convert target_freq from kHz to Hz */
freq = clk_round_rate(cpuclk, target_freq * 1000);
if (freq < (policy->min * 1000) || freq > (policy->max * 1000))
return -EINVAL;
- pr_debug("cpufreq: requested frequency %u Hz\n", target_freq * 1000);
+ dev_dbg(dev, "requested frequency %u Hz\n", target_freq * 1000);
freqs.cpu = cpu;
freqs.old = sh_cpufreq_get(cpu);
@@ -70,78 +79,112 @@ static int sh_cpufreq_target(struct cpufreq_policy *policy,
clk_set_rate(cpuclk, freq);
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
- pr_debug("cpufreq: set frequency %lu Hz\n", freq);
+ dev_dbg(dev, "set frequency %lu Hz\n", freq);
+
+ return 0;
+}
+
+static int sh_cpufreq_verify(struct cpufreq_policy *policy)
+{
+ struct clk *cpuclk = &per_cpu(sh_cpuclk, policy->cpu);
+ struct cpufreq_frequency_table *freq_table;
+
+ freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;
+ if (freq_table)
+ return cpufreq_frequency_table_verify(policy, freq_table);
+
+ cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+
+ policy->min = (clk_round_rate(cpuclk, 1) + 500) / 1000;
+ policy->max = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
+
+ cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
return 0;
}
static int sh_cpufreq_cpu_init(struct cpufreq_policy *policy)
{
- if (!cpu_online(policy->cpu))
+ unsigned int cpu = policy->cpu;
+ struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
+ struct cpufreq_frequency_table *freq_table;
+ struct device *dev;
+
+ if (!cpu_online(cpu))
return -ENODEV;
- cpuclk = clk_get(NULL, "cpu_clk");
+ dev = get_cpu_device(cpu);
+
+ cpuclk = clk_get(dev, "cpu_clk");
if (IS_ERR(cpuclk)) {
- printk(KERN_ERR "cpufreq: couldn't get CPU#%d clk\n",
- policy->cpu);
+ dev_err(dev, "couldn't get CPU clk\n");
return PTR_ERR(cpuclk);
}
- /* cpuinfo and default policy values */
- policy->cpuinfo.min_freq = (clk_round_rate(cpuclk, 1) + 500) / 1000;
- policy->cpuinfo.max_freq = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
- policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
+ policy->cur = policy->min = policy->max = sh_cpufreq_get(cpu);
- policy->cur = sh_cpufreq_get(policy->cpu);
- policy->min = policy->cpuinfo.min_freq;
- policy->max = policy->cpuinfo.max_freq;
+ freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;
+ if (freq_table) {
+ int result;
- /*
- * Catch the cases where the clock framework hasn't been wired up
- * properly to support scaling.
- */
- if (unlikely(policy->min == policy->max)) {
- printk(KERN_ERR "cpufreq: clock framework rate rounding "
- "not supported on CPU#%d.\n", policy->cpu);
+ result = cpufreq_frequency_table_cpuinfo(policy, freq_table);
+ if (!result)
+ cpufreq_frequency_table_get_attr(freq_table, cpu);
+ } else {
+ dev_notice(dev, "no frequency table found, falling back "
+ "to rate rounding.\n");
- clk_put(cpuclk);
- return -EINVAL;
+ policy->cpuinfo.min_freq =
+ (clk_round_rate(cpuclk, 1) + 500) / 1000;
+ policy->cpuinfo.max_freq =
+ (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
}
- printk(KERN_INFO "cpufreq: CPU#%d Frequencies - Minimum %u.%03u MHz, "
+ policy->min = policy->cpuinfo.min_freq;
+ policy->max = policy->cpuinfo.max_freq;
+
+ policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
+
+ dev_info(dev, "CPU Frequencies - Minimum %u.%03u MHz, "
"Maximum %u.%03u MHz.\n",
- policy->cpu, policy->min / 1000, policy->min % 1000,
+ policy->min / 1000, policy->min % 1000,
policy->max / 1000, policy->max % 1000);
return 0;
}
-static int sh_cpufreq_verify(struct cpufreq_policy *policy)
+static int sh_cpufreq_cpu_exit(struct cpufreq_policy *policy)
{
- cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
- policy->cpuinfo.max_freq);
- return 0;
-}
+ unsigned int cpu = policy->cpu;
+ struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
-static int sh_cpufreq_exit(struct cpufreq_policy *policy)
-{
+ cpufreq_frequency_table_put_attr(cpu);
clk_put(cpuclk);
+
return 0;
}
+static struct freq_attr *sh_freq_attr[] = {
+ &cpufreq_freq_attr_scaling_available_freqs,
+ NULL,
+};
+
static struct cpufreq_driver sh_cpufreq_driver = {
.owner = THIS_MODULE,
.name = "sh",
- .init = sh_cpufreq_cpu_init,
- .verify = sh_cpufreq_verify,
- .target = sh_cpufreq_target,
.get = sh_cpufreq_get,
- .exit = sh_cpufreq_exit,
+ .target = sh_cpufreq_target,
+ .verify = sh_cpufreq_verify,
+ .init = sh_cpufreq_cpu_init,
+ .exit = sh_cpufreq_cpu_exit,
+ .attr = sh_freq_attr,
};
static int __init sh_cpufreq_module_init(void)
{
- printk(KERN_INFO "cpufreq: SuperH CPU frequency driver.\n");
+ pr_notice("SuperH CPU frequency driver.\n");
return cpufreq_register_driver(&sh_cpufreq_driver);
}
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 02:23:47 +0000