cpufreq: introduce cpufreq_generic_get() routine
CPUFreq drivers that use clock frameworks interface,i.e. clk_get_rate(),
to get CPUs clk rate, have similar sort of code used in most of them.
This patch adds a generic ->get() which will do the same thing for them.
All those drivers are required to now is to set .get to cpufreq_generic_get()
and set their clk pointer in policy->clk during ->init().
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
diff --git a/drivers/cpufreq/exynos5440-cpufreq.c b/drivers/cpufreq/exynos5440-cpufreq.c
index ffe6fae..49b75601 100644
--- a/drivers/cpufreq/exynos5440-cpufreq.c
+++ b/drivers/cpufreq/exynos5440-cpufreq.c
@@ -100,7 +100,6 @@
struct resource *mem;
int irq;
struct clk *cpu_clk;
- unsigned int cur_frequency;
unsigned int latency;
struct cpufreq_frequency_table *freq_table;
unsigned int freq_count;
@@ -165,7 +164,7 @@
return 0;
}
-static void exynos_enable_dvfs(void)
+static void exynos_enable_dvfs(unsigned int cur_frequency)
{
unsigned int tmp, i, cpu;
struct cpufreq_frequency_table *freq_table = dvfs_info->freq_table;
@@ -184,18 +183,18 @@
/* Set initial performance index */
for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++)
- if (freq_table[i].frequency == dvfs_info->cur_frequency)
+ if (freq_table[i].frequency == cur_frequency)
break;
if (freq_table[i].frequency == CPUFREQ_TABLE_END) {
dev_crit(dvfs_info->dev, "Boot up frequency not supported\n");
/* Assign the highest frequency */
i = 0;
- dvfs_info->cur_frequency = freq_table[i].frequency;
+ cur_frequency = freq_table[i].frequency;
}
dev_info(dvfs_info->dev, "Setting dvfs initial frequency = %uKHZ",
- dvfs_info->cur_frequency);
+ cur_frequency);
for (cpu = 0; cpu < CONFIG_NR_CPUS; cpu++) {
tmp = __raw_readl(dvfs_info->base + XMU_C0_3_PSTATE + cpu * 4);
@@ -209,11 +208,6 @@
dvfs_info->base + XMU_DVFS_CTRL);
}
-static unsigned int exynos_getspeed(unsigned int cpu)
-{
- return dvfs_info->cur_frequency;
-}
-
static int exynos_target(struct cpufreq_policy *policy, unsigned int index)
{
unsigned int tmp;
@@ -222,7 +216,7 @@
mutex_lock(&cpufreq_lock);
- freqs.old = dvfs_info->cur_frequency;
+ freqs.old = policy->cur;
freqs.new = freq_table[index].frequency;
cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
@@ -250,7 +244,7 @@
goto skip_work;
mutex_lock(&cpufreq_lock);
- freqs.old = dvfs_info->cur_frequency;
+ freqs.old = policy->cur;
cur_pstate = __raw_readl(dvfs_info->base + XMU_P_STATUS);
if (cur_pstate >> C0_3_PSTATE_VALID_SHIFT & 0x1)
@@ -260,10 +254,9 @@
if (likely(index < dvfs_info->freq_count)) {
freqs.new = freq_table[index].frequency;
- dvfs_info->cur_frequency = freqs.new;
} else {
dev_crit(dvfs_info->dev, "New frequency out of range\n");
- freqs.new = dvfs_info->cur_frequency;
+ freqs.new = freqs.old;
}
cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
@@ -307,6 +300,7 @@
static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy)
{
+ policy->clk = dvfs_info->cpu_clk;
return cpufreq_generic_init(policy, dvfs_info->freq_table,
dvfs_info->latency);
}
@@ -316,7 +310,7 @@
CPUFREQ_NEED_INITIAL_FREQ_CHECK,
.verify = cpufreq_generic_frequency_table_verify,
.target_index = exynos_target,
- .get = exynos_getspeed,
+ .get = cpufreq_generic_get,
.init = exynos_cpufreq_cpu_init,
.exit = cpufreq_generic_exit,
.name = CPUFREQ_NAME,
@@ -336,6 +330,7 @@
int ret = -EINVAL;
struct device_node *np;
struct resource res;
+ unsigned int cur_frequency;
np = pdev->dev.of_node;
if (!np)
@@ -392,13 +387,13 @@
goto err_free_table;
}
- dvfs_info->cur_frequency = clk_get_rate(dvfs_info->cpu_clk);
- if (!dvfs_info->cur_frequency) {
+ cur_frequency = clk_get_rate(dvfs_info->cpu_clk);
+ if (!cur_frequency) {
dev_err(dvfs_info->dev, "Failed to get clock rate\n");
ret = -EINVAL;
goto err_free_table;
}
- dvfs_info->cur_frequency /= 1000;
+ cur_frequency /= 1000;
INIT_WORK(&dvfs_info->irq_work, exynos_cpufreq_work);
ret = devm_request_irq(dvfs_info->dev, dvfs_info->irq,
@@ -415,7 +410,7 @@
goto err_free_table;
}
- exynos_enable_dvfs();
+ exynos_enable_dvfs(cur_frequency);
ret = cpufreq_register_driver(&exynos_driver);
if (ret) {
dev_err(dvfs_info->dev,