Merge branch 'sh/cpufreq' into sh-latest

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);
 }