1 files changed, 141 insertions, 0 deletions
diff --git a/arch/arm/mach-ux500/pm/cpufreq.c b/arch/arm/mach-ux500/pm/cpufreq.c
new file mode 100644
index 00000000000..1f5999e8271
--- /dev/null
+++ b/arch/arm/mach-ux500/pm/cpufreq.c
@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) STMicroelectronics 2009
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * License Terms: GNU General Public License v2
+ * Author: Sundar Iyer <sundar.iyer@stericsson.com>
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/cpufreq.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+
+#include <mach/hardware.h>
+#include <mach/prcmu-fw-api.h>
+#include <mach/prcmu-regs.h>
+
+static struct cpufreq_frequency_table *freq_table;
+static enum arm_opp *idx2opp;
+
+static struct freq_attr *u8500_cpufreq_attr[] = {
+	&cpufreq_freq_attr_scaling_available_freqs,
+	NULL,
+};
+
+static int u8500_cpufreq_verify_speed(struct cpufreq_policy *policy)
+{
+	return cpufreq_frequency_table_verify(policy, freq_table);
+}
+
+static int u8500_cpufreq_target(struct cpufreq_policy *policy,
+				unsigned int target_freq,
+				unsigned int relation)
+{
+	struct cpufreq_freqs freqs;
+	unsigned int idx;
+
+	/* scale the target frequency to one of the extremes supported */
+	if (target_freq < policy->cpuinfo.min_freq)
+		target_freq = policy->cpuinfo.min_freq;
+	if (target_freq > policy->cpuinfo.max_freq)
+		target_freq = policy->cpuinfo.max_freq;
+
+	/* Lookup the next frequency */
+	if (cpufreq_frequency_table_target
+	    (policy, freq_table, target_freq, relation, &idx)) {
+		return -EINVAL;
+	}
+
+	freqs.old = policy->cur;
+	freqs.new = freq_table[idx].frequency;
+	freqs.cpu = policy->cpu;
+
+	if (freqs.old == freqs.new)
+		return 0;
+
+	/* pre-change notification */
+	cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+
+	/* request the PRCM unit for opp change */
+	if (prcmu_set_arm_opp(idx2opp[idx])) {
+		pr_err("u8500-cpufreq:  Failed to set OPP level\n");
+		return -EINVAL;
+	}
+
+	/* post change notification */
+	cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
+	return 0;
+}
+
+static unsigned int u8500_cpufreq_getspeed(unsigned int cpu)
+{
+	int i;
+	/* request the prcm to get the current ARM opp */
+	for (i = 0; prcmu_get_arm_opp() != idx2opp[i]; i++)
+		;
+	return freq_table[i].frequency;
+}
+
+static int __cpuinit u8500_cpufreq_init(struct cpufreq_policy *policy)
+{
+	int res;
+	int i;
+
+	/* get policy fields based on the table */
+	res = cpufreq_frequency_table_cpuinfo(policy, freq_table);
+	if (!res)
+		cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
+	else {
+		pr_err("u8500-cpufreq : Failed to read policy table\n");
+		return res;
+	}
+
+	policy->min = policy->cpuinfo.min_freq;
+	policy->max = policy->cpuinfo.max_freq;
+	policy->cur = u8500_cpufreq_getspeed(policy->cpu);
+
+	for (i = 0; freq_table[i].frequency != policy->cur; i++)
+		;
+
+	policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
+
+	/*
+	 * FIXME : Need to take time measurement across the target()
+	 *	   function with no/some/all drivers in the notification
+	 *	   list.
+	 */
+	policy->cpuinfo.transition_latency = 20 * 1000; /* in ns */
+
+	/* policy sharing between dual CPUs */
+	cpumask_copy(policy->cpus, &cpu_present_map);
+
+	policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
+
+	return 0;
+}
+
+static struct cpufreq_driver u8500_cpufreq_driver = {
+	.flags  = CPUFREQ_STICKY,
+	.verify = u8500_cpufreq_verify_speed,
+	.target = u8500_cpufreq_target,
+	.get    = u8500_cpufreq_getspeed,
+	.init   = u8500_cpufreq_init,
+	.name   = "U8500",
+	.attr   = u8500_cpufreq_attr,
+};
+
+int __init
+ux500_cpufreq_register(struct cpufreq_frequency_table *table,
+		       enum arm_opp *idx2opplist)
+{
+	freq_table = table;
+	idx2opp = idx2opplist;
+
+	if (ux500_is_svp())
+		return -ENODEV;
+
+	pr_info("cpufreq for u8500 started\n");
+	return cpufreq_register_driver(&u8500_cpufreq_driver);
+}