1 files changed, 113 insertions, 181 deletions

diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c
index 5d04c57aae3..5f69c9aa703 100644
--- a/drivers/cpufreq/omap-cpufreq.c
+++ b/drivers/cpufreq/omap-cpufreq.c
@@ -22,132 +22,83 @@
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/io.h>
-#include <linux/opp.h>
+#include <linux/pm_opp.h>
 #include <linux/cpu.h>
 #include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
 
-#include <asm/system.h>
 #include <asm/smp_plat.h>
 #include <asm/cpu.h>
 
-#include <plat/clock.h>
-#include <plat/omap-pm.h>
-#include <plat/common.h>
-#include <plat/omap_device.h>
-
-#include <mach/hardware.h>
-
-#ifdef CONFIG_SMP
-struct lpj_info {
-	unsigned long	ref;
-	unsigned int	freq;
-};
-
-static DEFINE_PER_CPU(struct lpj_info, lpj_ref);
-static struct lpj_info global_lpj_ref;
-#endif
+/* OPP tolerance in percentage */
+#define	OPP_TOLERANCE	4
 
 static struct cpufreq_frequency_table *freq_table;
 static atomic_t freq_table_users = ATOMIC_INIT(0);
-static struct clk *mpu_clk;
-static char *mpu_clk_name;
 static struct device *mpu_dev;
+static struct regulator *mpu_reg;
 
-static int omap_verify_speed(struct cpufreq_policy *policy)
-{
-	if (!freq_table)
-		return -EINVAL;
-	return cpufreq_frequency_table_verify(policy, freq_table);
-}
-
-static unsigned int omap_getspeed(unsigned int cpu)
-{
-	unsigned long rate;
-
-	if (cpu >= NR_CPUS)
-		return 0;
-
-	rate = clk_get_rate(mpu_clk) / 1000;
-	return rate;
-}
-
-static int omap_target(struct cpufreq_policy *policy,
-		       unsigned int target_freq,
-		       unsigned int relation)
+static int omap_target(struct cpufreq_policy *policy, unsigned int index)
 {
-	unsigned int i;
-	int ret = 0;
-	struct cpufreq_freqs freqs;
-
-	if (!freq_table) {
-		dev_err(mpu_dev, "%s: cpu%d: no freq table!\n", __func__,
-				policy->cpu);
-		return -EINVAL;
-	}
-
-	ret = cpufreq_frequency_table_target(policy, freq_table, target_freq,
-			relation, &i);
-	if (ret) {
-		dev_dbg(mpu_dev, "%s: cpu%d: no freq match for %d(ret=%d)\n",
-			__func__, policy->cpu, target_freq, ret);
+	int r, ret;
+	struct dev_pm_opp *opp;
+	unsigned long freq, volt = 0, volt_old = 0, tol = 0;
+	unsigned int old_freq, new_freq;
+
+	old_freq = policy->cur;
+	new_freq = freq_table[index].frequency;
+
+	freq = new_freq * 1000;
+	ret = clk_round_rate(policy->clk, freq);
+	if (IS_ERR_VALUE(ret)) {
+		dev_warn(mpu_dev,
+			 "CPUfreq: Cannot find matching frequency for %lu\n",
+			 freq);
 		return ret;
 	}
-	freqs.new = freq_table[i].frequency;
-	if (!freqs.new) {
-		dev_err(mpu_dev, "%s: cpu%d: no match for freq %d\n", __func__,
-			policy->cpu, target_freq);
-		return -EINVAL;
-	}
-
-	freqs.old = omap_getspeed(policy->cpu);
-	freqs.cpu = policy->cpu;
-
-	if (freqs.old == freqs.new && policy->cur == freqs.new)
-		return ret;
-
-	/* notifiers */
-	for_each_cpu(i, policy->cpus) {
-		freqs.cpu = i;
-		cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+	freq = ret;
+
+	if (mpu_reg) {
+		rcu_read_lock();
+		opp = dev_pm_opp_find_freq_ceil(mpu_dev, &freq);
+		if (IS_ERR(opp)) {
+			rcu_read_unlock();
+			dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
+				__func__, new_freq);
+			return -EINVAL;
+		}
+		volt = dev_pm_opp_get_voltage(opp);
+		rcu_read_unlock();
+		tol = volt * OPP_TOLERANCE / 100;
+		volt_old = regulator_get_voltage(mpu_reg);
 	}
 
-#ifdef CONFIG_CPU_FREQ_DEBUG
-	pr_info("cpufreq-omap: transition: %u --> %u\n", freqs.old, freqs.new);
-#endif
-
-	ret = clk_set_rate(mpu_clk, freqs.new * 1000);
-	freqs.new = omap_getspeed(policy->cpu);
-
-#ifdef CONFIG_SMP
-	/*
-	 * Note that loops_per_jiffy is not updated on SMP systems in
-	 * cpufreq driver. So, update the per-CPU loops_per_jiffy value
-	 * on frequency transition. We need to update all dependent CPUs.
-	 */
-	for_each_cpu(i, policy->cpus) {
-		struct lpj_info *lpj = &per_cpu(lpj_ref, i);
-		if (!lpj->freq) {
-			lpj->ref = per_cpu(cpu_data, i).loops_per_jiffy;
-			lpj->freq = freqs.old;
+	dev_dbg(mpu_dev, "cpufreq-omap: %u MHz, %ld mV --> %u MHz, %ld mV\n", 
+		old_freq / 1000, volt_old ? volt_old / 1000 : -1,
+		new_freq / 1000, volt ? volt / 1000 : -1);
+
+	/* scaling up?  scale voltage before frequency */
+	if (mpu_reg && (new_freq > old_freq)) {
+		r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
+		if (r < 0) {
+			dev_warn(mpu_dev, "%s: unable to scale voltage up.\n",
+				 __func__);
+			return r;
 		}
-
-		per_cpu(cpu_data, i).loops_per_jiffy =
-			cpufreq_scale(lpj->ref, lpj->freq, freqs.new);
 	}
 
-	/* And don't forget to adjust the global one */
-	if (!global_lpj_ref.freq) {
-		global_lpj_ref.ref = loops_per_jiffy;
-		global_lpj_ref.freq = freqs.old;
-	}
-	loops_per_jiffy = cpufreq_scale(global_lpj_ref.ref, global_lpj_ref.freq,
-					freqs.new);
-#endif
+	ret = clk_set_rate(policy->clk, new_freq * 1000);
 
-	/* notifiers */
-	for_each_cpu(i, policy->cpus) {
-		freqs.cpu = i;
-		cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+	/* scaling down?  scale voltage after frequency */
+	if (mpu_reg && (new_freq < old_freq)) {
+		r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
+		if (r < 0) {
+			dev_warn(mpu_dev, "%s: unable to scale voltage down.\n",
+				 __func__);
+			clk_set_rate(policy->clk, old_freq * 1000);
+			return r;
+		}
 	}
 
 	return ret;
@@ -156,119 +107,100 @@ static int omap_target(struct cpufreq_policy *policy,
 static inline void freq_table_free(void)
 {
 	if (atomic_dec_and_test(&freq_table_users))
-		opp_free_cpufreq_table(mpu_dev, &freq_table);
+		dev_pm_opp_free_cpufreq_table(mpu_dev, &freq_table);
 }
 
-static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
+static int omap_cpu_init(struct cpufreq_policy *policy)
 {
-	int result = 0;
-
-	mpu_clk = clk_get(NULL, mpu_clk_name);
-	if (IS_ERR(mpu_clk))
-		return PTR_ERR(mpu_clk);
-
-	if (policy->cpu >= NR_CPUS) {
-		result = -EINVAL;
-		goto fail_ck;
-	}
-
-	policy->cur = policy->min = policy->max = omap_getspeed(policy->cpu);
+	int result;
 
-	if (atomic_inc_return(&freq_table_users) == 1)
-		result = opp_init_cpufreq_table(mpu_dev, &freq_table);
+	policy->clk = clk_get(NULL, "cpufreq_ck");
+	if (IS_ERR(policy->clk))
+		return PTR_ERR(policy->clk);
 
-	if (result) {
-		dev_err(mpu_dev, "%s: cpu%d: failed creating freq table[%d]\n",
+	if (!freq_table) {
+		result = dev_pm_opp_init_cpufreq_table(mpu_dev, &freq_table);
+		if (result) {
+			dev_err(mpu_dev,
+				"%s: cpu%d: failed creating freq table[%d]\n",
 				__func__, policy->cpu, result);
-		goto fail_ck;
+			goto fail;
+		}
 	}
 
-	result = cpufreq_frequency_table_cpuinfo(policy, freq_table);
-	if (result)
-		goto fail_table;
-
-	cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
-
-	policy->min = policy->cpuinfo.min_freq;
-	policy->max = policy->cpuinfo.max_freq;
-	policy->cur = omap_getspeed(policy->cpu);
-
-	/*
-	 * On OMAP SMP configuartion, both processors share the voltage
-	 * and clock. So both CPUs needs to be scaled together and hence
-	 * needs software co-ordination. Use cpufreq affected_cpus
-	 * interface to handle this scenario. Additional is_smp() check
-	 * is to keep SMP_ON_UP build working.
-	 */
-	if (is_smp()) {
-		policy->shared_type = CPUFREQ_SHARED_TYPE_ANY;
-		cpumask_setall(policy->cpus);
-	}
+	atomic_inc_return(&freq_table_users);
 
 	/* FIXME: what's the actual transition time? */
-	policy->cpuinfo.transition_latency = 300 * 1000;
-
-	return 0;
+	result = cpufreq_generic_init(policy, freq_table, 300 * 1000);
+	if (!result)
+		return 0;
 
-fail_table:
 	freq_table_free();
-fail_ck:
-	clk_put(mpu_clk);
+fail:
+	clk_put(policy->clk);
 	return result;
 }
 
 static int omap_cpu_exit(struct cpufreq_policy *policy)
 {
 	freq_table_free();
-	clk_put(mpu_clk);
+	clk_put(policy->clk);
 	return 0;
 }
 
-static struct freq_attr *omap_cpufreq_attr[] = {
-	&cpufreq_freq_attr_scaling_available_freqs,
-	NULL,
-};
-
 static struct cpufreq_driver omap_driver = {
-	.flags		= CPUFREQ_STICKY,
-	.verify		= omap_verify_speed,
-	.target		= omap_target,
-	.get		= omap_getspeed,
+	.flags		= CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK,
+	.verify		= cpufreq_generic_frequency_table_verify,
+	.target_index	= omap_target,
+	.get		= cpufreq_generic_get,
 	.init		= omap_cpu_init,
 	.exit		= omap_cpu_exit,
 	.name		= "omap",
-	.attr		= omap_cpufreq_attr,
+	.attr		= cpufreq_generic_attr,
 };
 
-static int __init omap_cpufreq_init(void)
+static int omap_cpufreq_probe(struct platform_device *pdev)
 {
-	if (cpu_is_omap24xx())
-		mpu_clk_name = "virt_prcm_set";
-	else if (cpu_is_omap34xx())
-		mpu_clk_name = "dpll1_ck";
-	else if (cpu_is_omap44xx())
-		mpu_clk_name = "dpll_mpu_ck";
-
-	if (!mpu_clk_name) {
-		pr_err("%s: unsupported Silicon?\n", __func__);
-		return -EINVAL;
-	}
-
-	mpu_dev = omap_device_get_by_hwmod_name("mpu");
+	mpu_dev = get_cpu_device(0);
 	if (!mpu_dev) {
 		pr_warning("%s: unable to get the mpu device\n", __func__);
 		return -EINVAL;
 	}
 
+	mpu_reg = regulator_get(mpu_dev, "vcc");
+	if (IS_ERR(mpu_reg)) {
+		pr_warning("%s: unable to get MPU regulator\n", __func__);
+		mpu_reg = NULL;
+	} else {
+		/* 
+		 * Ensure physical regulator is present.
+		 * (e.g. could be dummy regulator.)
+		 */
+		if (regulator_get_voltage(mpu_reg) < 0) {
+			pr_warn("%s: physical regulator not present for MPU\n",
+				__func__);
+			regulator_put(mpu_reg);
+			mpu_reg = NULL;
+		}
+	}
+
 	return cpufreq_register_driver(&omap_driver);
 }
 
-static void __exit omap_cpufreq_exit(void)
+static int omap_cpufreq_remove(struct platform_device *pdev)
 {
-	cpufreq_unregister_driver(&omap_driver);
+	return cpufreq_unregister_driver(&omap_driver);
 }
 
+static struct platform_driver omap_cpufreq_platdrv = {
+	.driver = {
+		.name	= "omap-cpufreq",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= omap_cpufreq_probe,
+	.remove		= omap_cpufreq_remove,
+};
+module_platform_driver(omap_cpufreq_platdrv);
+
 MODULE_DESCRIPTION("cpufreq driver for OMAP SoCs");
 MODULE_LICENSE("GPL");
-module_init(omap_cpufreq_init);
-module_exit(omap_cpufreq_exit);