[CPUFREQ] EXYNOS: Make EXYNOS common cpufreq driver

To support various EXYNOS series SoCs commonly,
added exynos common structure.
exynos-cpufreq.c => EXYNOS series common cpufreq driver
exynos4210-cpufreq.c => EXYNOS4210 support cpufreq driver

Signed-off-by: Jaecheol Lee <jc.lee@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Dave Jones <davej@redhat.com>

1 files changed, 72 insertions, 313 deletions

diff --git a/drivers/cpufreq/exynos4210-cpufreq.c b/drivers/cpufreq/exynos4210-cpufreq.c
index a0af2d4448a..6bc4ada56df 100644
--- a/drivers/cpufreq/exynos4210-cpufreq.c
+++ b/drivers/cpufreq/exynos4210-cpufreq.c
@@ -2,7 +2,7 @@
  * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
  *		http://www.samsung.com
  *
- * EXYNOS4 - CPU frequency scaling support
+ * EXYNOS4210 - CPU frequency scaling support
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -23,10 +23,16 @@
 #include <mach/map.h>
 #include <mach/regs-clock.h>
 #include <mach/regs-mem.h>
+#include <mach/cpufreq.h>
 
 #include <plat/clock.h>
 #include <plat/pm.h>
 
+#define CPUFREQ_LEVEL_END	L5
+
+static int max_support_idx = L0;
+static int min_support_idx = (CPUFREQ_LEVEL_END - 1);
+
 static struct clk *cpu_clk;
 static struct clk *moutcore;
 static struct clk *mout_mpll;
@@ -37,20 +43,18 @@ static struct regulator *arm_regulator;
 static struct cpufreq_freqs freqs;
 
 struct cpufreq_clkdiv {
+	unsigned int index;
 	unsigned int clkdiv;
 };
 
-static unsigned int locking_frequency;
-static bool frequency_locked;
-static DEFINE_MUTEX(cpufreq_lock);
-
-enum cpufreq_level_index {
-	L0, L1, L2, L3, L4, CPUFREQ_LEVEL_END,
+static unsigned int exynos4210_volt_table[CPUFREQ_LEVEL_END] = {
+	1250000, 1150000, 1050000, 975000, 950000,
 };
 
-static struct cpufreq_clkdiv exynos4_clkdiv_table[CPUFREQ_LEVEL_END];
 
-static struct cpufreq_frequency_table exynos4_freq_table[] = {
+static struct cpufreq_clkdiv exynos4210_clkdiv_table[CPUFREQ_LEVEL_END];
+
+static struct cpufreq_frequency_table exynos4210_freq_table[] = {
 	{L0, 1200*1000},
 	{L1, 1000*1000},
 	{L2, 800*1000},
@@ -104,31 +108,7 @@ static unsigned int clkdiv_cpu1[CPUFREQ_LEVEL_END][2] = {
 	{ 3, 0 },
 };
 
-struct cpufreq_voltage_table {
-	unsigned int	index;		/* any */
-	unsigned int	arm_volt;	/* uV */
-};
-
-static struct cpufreq_voltage_table exynos4_volt_table[CPUFREQ_LEVEL_END] = {
-	{
-		.index		= L0,
-		.arm_volt	= 1350000,
-	}, {
-		.index		= L1,
-		.arm_volt	= 1300000,
-	}, {
-		.index		= L2,
-		.arm_volt	= 1200000,
-	}, {
-		.index		= L3,
-		.arm_volt	= 1100000,
-	}, {
-		.index		= L4,
-		.arm_volt	= 1050000,
-	},
-};
-
-static unsigned int exynos4_apll_pms_table[CPUFREQ_LEVEL_END] = {
+static unsigned int exynos4210_apll_pms_table[CPUFREQ_LEVEL_END] = {
 	/* APLL FOUT L0: 1200MHz */
 	((150 << 16) | (3 << 8) | 1),
 
@@ -145,23 +125,13 @@ static unsigned int exynos4_apll_pms_table[CPUFREQ_LEVEL_END] = {
 	((200 << 16) | (6 << 8) | 3),
 };
 
-static int exynos4_verify_speed(struct cpufreq_policy *policy)
-{
-	return cpufreq_frequency_table_verify(policy, exynos4_freq_table);
-}
-
-static unsigned int exynos4_getspeed(unsigned int cpu)
-{
-	return clk_get_rate(cpu_clk) / 1000;
-}
-
-static void exynos4_set_clkdiv(unsigned int div_index)
+static void exynos4210_set_clkdiv(unsigned int div_index)
 {
 	unsigned int tmp;
 
 	/* Change Divider - CPU0 */
 
-	tmp = exynos4_clkdiv_table[div_index].clkdiv;
+	tmp = exynos4210_clkdiv_table[div_index].clkdiv;
 
 	__raw_writel(tmp, S5P_CLKDIV_CPU);
 
@@ -185,7 +155,7 @@ static void exynos4_set_clkdiv(unsigned int div_index)
 	} while (tmp & 0x11);
 }
 
-static void exynos4_set_apll(unsigned int index)
+static void exynos4210_set_apll(unsigned int index)
 {
 	unsigned int tmp;
 
@@ -204,7 +174,7 @@ static void exynos4_set_apll(unsigned int index)
 	/* 3. Change PLL PMS values */
 	tmp = __raw_readl(S5P_APLL_CON0);
 	tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0));
-	tmp |= exynos4_apll_pms_table[index];
+	tmp |= exynos4210_apll_pms_table[index];
 	__raw_writel(tmp, S5P_APLL_CON0);
 
 	/* 4. wait_lock_time */
@@ -221,305 +191,90 @@ static void exynos4_set_apll(unsigned int index)
 	} while (tmp != (0x1 << S5P_CLKSRC_CPU_MUXCORE_SHIFT));
 }
 
-static void exynos4_set_frequency(unsigned int old_index, unsigned int new_index)
+bool exynos4210_pms_change(unsigned int old_index, unsigned int new_index)
+{
+	unsigned int old_pm = (exynos4210_apll_pms_table[old_index] >> 8);
+	unsigned int new_pm = (exynos4210_apll_pms_table[new_index] >> 8);
+
+	return (old_pm == new_pm) ? 0 : 1;
+}
+
+static void exynos4210_set_frequency(unsigned int old_index,
+				     unsigned int new_index)
 {
 	unsigned int tmp;
 
 	if (old_index > new_index) {
-		/*
-		 * L1/L3, L2/L4 Level change require
-		 * to only change s divider value
-		 */
-		if (((old_index == L3) && (new_index == L1)) ||
-				((old_index == L4) && (new_index == L2))) {
+		if (!exynos4210_pms_change(old_index, new_index)) {
 			/* 1. Change the system clock divider values */
-			exynos4_set_clkdiv(new_index);
+			exynos4210_set_clkdiv(new_index);
 
 			/* 2. Change just s value in apll m,p,s value */
 			tmp = __raw_readl(S5P_APLL_CON0);
 			tmp &= ~(0x7 << 0);
-			tmp |= (exynos4_apll_pms_table[new_index] & 0x7);
+			tmp |= (exynos4210_apll_pms_table[new_index] & 0x7);
 			__raw_writel(tmp, S5P_APLL_CON0);
 		} else {
 			/* Clock Configuration Procedure */
 			/* 1. Change the system clock divider values */
-			exynos4_set_clkdiv(new_index);
+			exynos4210_set_clkdiv(new_index);
 			/* 2. Change the apll m,p,s value */
-			exynos4_set_apll(new_index);
+			exynos4210_set_apll(new_index);
 		}
 	} else if (old_index < new_index) {
-		/*
-		 * L1/L3, L2/L4 Level change require
-		 * to only change s divider value
-		 */
-		if (((old_index == L1) && (new_index == L3)) ||
-				((old_index == L2) && (new_index == L4))) {
+		if (!exynos4210_pms_change(old_index, new_index)) {
 			/* 1. Change just s value in apll m,p,s value */
 			tmp = __raw_readl(S5P_APLL_CON0);
 			tmp &= ~(0x7 << 0);
-			tmp |= (exynos4_apll_pms_table[new_index] & 0x7);
+			tmp |= (exynos4210_apll_pms_table[new_index] & 0x7);
 			__raw_writel(tmp, S5P_APLL_CON0);
 
 			/* 2. Change the system clock divider values */
-			exynos4_set_clkdiv(new_index);
+			exynos4210_set_clkdiv(new_index);
 		} else {
 			/* Clock Configuration Procedure */
 			/* 1. Change the apll m,p,s value */
-			exynos4_set_apll(new_index);
+			exynos4210_set_apll(new_index);
 			/* 2. Change the system clock divider values */
-			exynos4_set_clkdiv(new_index);
+			exynos4210_set_clkdiv(new_index);
 		}
 	}
 }
 
-static int exynos4_target(struct cpufreq_policy *policy,
-			  unsigned int target_freq,
-			  unsigned int relation)
-{
-	unsigned int index, old_index;
-	unsigned int arm_volt;
-	int err = -EINVAL;
-
-	freqs.old = exynos4_getspeed(policy->cpu);
-
-	mutex_lock(&cpufreq_lock);
-
-	if (frequency_locked && target_freq != locking_frequency) {
-		err = -EAGAIN;
-		goto out;
-	}
-
-	if (cpufreq_frequency_table_target(policy, exynos4_freq_table,
-					   freqs.old, relation, &old_index))
-		goto out;
-
-	if (cpufreq_frequency_table_target(policy, exynos4_freq_table,
-					   target_freq, relation, &index))
-		goto out;
-
-	err = 0;
-
-	freqs.new = exynos4_freq_table[index].frequency;
-	freqs.cpu = policy->cpu;
-
-	if (freqs.new == freqs.old)
-		goto out;
-
-	/* get the voltage value */
-	arm_volt = exynos4_volt_table[index].arm_volt;
-
-	cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
-
-	/* control regulator */
-	if (freqs.new > freqs.old) {
-		/* Voltage up */
-		regulator_set_voltage(arm_regulator, arm_volt, arm_volt);
-	}
-
-	/* Clock Configuration Procedure */
-	exynos4_set_frequency(old_index, index);
-
-	cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
-
-	/* control regulator */
-	if (freqs.new < freqs.old) {
-		/* Voltage down */
-		regulator_set_voltage(arm_regulator, arm_volt, arm_volt);
-	}
-
-out:
-	mutex_unlock(&cpufreq_lock);
-	return err;
-}
-
-#ifdef CONFIG_PM
-/*
- * These suspend/resume are used as syscore_ops, it is already too
- * late to set regulator voltages at this stage.
- */
-static int exynos4_cpufreq_suspend(struct cpufreq_policy *policy)
-{
-	return 0;
-}
-
-static int exynos4_cpufreq_resume(struct cpufreq_policy *policy)
-{
-	return 0;
-}
-#endif
-
-/**
- * exynos4_cpufreq_pm_notifier - block CPUFREQ's activities in suspend-resume
- *			context
- * @notifier
- * @pm_event
- * @v
- *
- * While frequency_locked == true, target() ignores every frequency but
- * locking_frequency. The locking_frequency value is the initial frequency,
- * which is set by the bootloader. In order to eliminate possible
- * inconsistency in clock values, we save and restore frequencies during
- * suspend and resume and block CPUFREQ activities. Note that the standard
- * suspend/resume cannot be used as they are too deep (syscore_ops) for
- * regulator actions.
- */
-static int exynos4_cpufreq_pm_notifier(struct notifier_block *notifier,
-				       unsigned long pm_event, void *v)
-{
-	struct cpufreq_policy *policy = cpufreq_cpu_get(0); /* boot CPU */
-	static unsigned int saved_frequency;
-	unsigned int temp;
-
-	mutex_lock(&cpufreq_lock);
-	switch (pm_event) {
-	case PM_SUSPEND_PREPARE:
-		if (frequency_locked)
-			goto out;
-		frequency_locked = true;
-
-		if (locking_frequency) {
-			saved_frequency = exynos4_getspeed(0);
-
-			mutex_unlock(&cpufreq_lock);
-			exynos4_target(policy, locking_frequency,
-				       CPUFREQ_RELATION_H);
-			mutex_lock(&cpufreq_lock);
-		}
-
-		break;
-	case PM_POST_SUSPEND:
-
-		if (saved_frequency) {
-			/*
-			 * While frequency_locked, only locking_frequency
-			 * is valid for target(). In order to use
-			 * saved_frequency while keeping frequency_locked,
-			 * we temporarly overwrite locking_frequency.
-			 */
-			temp = locking_frequency;
-			locking_frequency = saved_frequency;
-
-			mutex_unlock(&cpufreq_lock);
-			exynos4_target(policy, locking_frequency,
-				       CPUFREQ_RELATION_H);
-			mutex_lock(&cpufreq_lock);
-
-			locking_frequency = temp;
-		}
-
-		frequency_locked = false;
-		break;
-	}
-out:
-	mutex_unlock(&cpufreq_lock);
-
-	return NOTIFY_OK;
-}
-
-static struct notifier_block exynos4_cpufreq_nb = {
-	.notifier_call = exynos4_cpufreq_pm_notifier,
-};
-
-static int exynos4_cpufreq_cpu_init(struct cpufreq_policy *policy)
-{
-	int ret;
-
-	policy->cur = policy->min = policy->max = exynos4_getspeed(policy->cpu);
-
-	cpufreq_frequency_table_get_attr(exynos4_freq_table, policy->cpu);
-
-	/* set the transition latency value */
-	policy->cpuinfo.transition_latency = 100000;
-
-	/*
-	 * EXYNOS4 multi-core processors has 2 cores
-	 * that the frequency cannot be set independently.
-	 * Each cpu is bound to the same speed.
-	 * So the affected cpu is all of the cpus.
-	 */
-	if (!cpu_online(1)) {
-		cpumask_copy(policy->related_cpus, cpu_possible_mask);
-		cpumask_copy(policy->cpus, cpu_online_mask);
-	} else {
-		cpumask_setall(policy->cpus);
-	}
-
-	ret = cpufreq_frequency_table_cpuinfo(policy, exynos4_freq_table);
-	if (ret)
-		return ret;
-
-	cpufreq_frequency_table_get_attr(exynos4_freq_table, policy->cpu);
-
-	return 0;
-}
-
-static int exynos4_cpufreq_cpu_exit(struct cpufreq_policy *policy)
-{
-	cpufreq_frequency_table_put_attr(policy->cpu);
-	return 0;
-}
-
-static struct freq_attr *exynos4_cpufreq_attr[] = {
-	&cpufreq_freq_attr_scaling_available_freqs,
-	NULL,
-};
-
-static struct cpufreq_driver exynos4_driver = {
-	.flags		= CPUFREQ_STICKY,
-	.verify		= exynos4_verify_speed,
-	.target		= exynos4_target,
-	.get		= exynos4_getspeed,
-	.init		= exynos4_cpufreq_cpu_init,
-	.exit		= exynos4_cpufreq_cpu_exit,
-	.name		= "exynos4_cpufreq",
-	.attr		= exynos4_cpufreq_attr,
-#ifdef CONFIG_PM
-	.suspend	= exynos4_cpufreq_suspend,
-	.resume		= exynos4_cpufreq_resume,
-#endif
-};
-
-static int __init exynos4_cpufreq_init(void)
+int exynos4210_cpufreq_init(struct exynos_dvfs_info *info)
 {
 	int i;
 	unsigned int tmp;
+	unsigned long rate;
 
 	cpu_clk = clk_get(NULL, "armclk");
 	if (IS_ERR(cpu_clk))
 		return PTR_ERR(cpu_clk);
 
-	locking_frequency = exynos4_getspeed(0);
-
 	moutcore = clk_get(NULL, "moutcore");
 	if (IS_ERR(moutcore))
-		goto out;
+		goto err_moutcore;
 
 	mout_mpll = clk_get(NULL, "mout_mpll");
 	if (IS_ERR(mout_mpll))
-		goto out;
+		goto err_mout_mpll;
+
+	rate = clk_get_rate(mout_mpll) / 1000;
 
 	mout_apll = clk_get(NULL, "mout_apll");
 	if (IS_ERR(mout_apll))
-		goto out;
-
-	arm_regulator = regulator_get(NULL, "vdd_arm");
-	if (IS_ERR(arm_regulator)) {
-		printk(KERN_ERR "failed to get resource %s\n", "vdd_arm");
-		goto out;
-	}
-
-	register_pm_notifier(&exynos4_cpufreq_nb);
+		goto err_mout_apll;
 
 	tmp = __raw_readl(S5P_CLKDIV_CPU);
 
 	for (i = L0; i <  CPUFREQ_LEVEL_END; i++) {
 		tmp &= ~(S5P_CLKDIV_CPU0_CORE_MASK |
-			 S5P_CLKDIV_CPU0_COREM0_MASK |
-			 S5P_CLKDIV_CPU0_COREM1_MASK |
-			 S5P_CLKDIV_CPU0_PERIPH_MASK |
-			 S5P_CLKDIV_CPU0_ATB_MASK |
-			 S5P_CLKDIV_CPU0_PCLKDBG_MASK |
-			 S5P_CLKDIV_CPU0_APLL_MASK);
+			S5P_CLKDIV_CPU0_COREM0_MASK |
+			S5P_CLKDIV_CPU0_COREM1_MASK |
+			S5P_CLKDIV_CPU0_PERIPH_MASK |
+			S5P_CLKDIV_CPU0_ATB_MASK |
+			S5P_CLKDIV_CPU0_PCLKDBG_MASK |
+			S5P_CLKDIV_CPU0_APLL_MASK);
 
 		tmp |= ((clkdiv_cpu0[i][0] << S5P_CLKDIV_CPU0_CORE_SHIFT) |
 			(clkdiv_cpu0[i][1] << S5P_CLKDIV_CPU0_COREM0_SHIFT) |
@@ -529,29 +284,33 @@ static int __init exynos4_cpufreq_init(void)
 			(clkdiv_cpu0[i][5] << S5P_CLKDIV_CPU0_PCLKDBG_SHIFT) |
 			(clkdiv_cpu0[i][6] << S5P_CLKDIV_CPU0_APLL_SHIFT));
 
-		exynos4_clkdiv_table[i].clkdiv = tmp;
+		exynos4210_clkdiv_table[i].clkdiv = tmp;
 	}
 
-	return cpufreq_register_driver(&exynos4_driver);
-
-out:
-	if (!IS_ERR(cpu_clk))
-		clk_put(cpu_clk);
+	info->mpll_freq_khz = rate;
+	info->pm_lock_idx = L2;
+	info->pll_safe_idx = L2;
+	info->max_support_idx = max_support_idx;
+	info->min_support_idx = min_support_idx;
+	info->cpu_clk = cpu_clk;
+	info->volt_table = exynos4210_volt_table;
+	info->freq_table = exynos4210_freq_table;
+	info->set_freq = exynos4210_set_frequency;
+	info->need_apll_change = exynos4210_pms_change;
 
-	if (!IS_ERR(moutcore))
-		clk_put(moutcore);
+	return 0;
 
+err_mout_apll:
 	if (!IS_ERR(mout_mpll))
 		clk_put(mout_mpll);
+err_mout_mpll:
+	if (!IS_ERR(moutcore))
+		clk_put(moutcore);
+err_moutcore:
+	if (!IS_ERR(cpu_clk))
+		clk_put(cpu_clk);
 
-	if (!IS_ERR(mout_apll))
-		clk_put(mout_apll);
-
-	if (!IS_ERR(arm_regulator))
-		regulator_put(arm_regulator);
-
-	printk(KERN_ERR "%s: failed initialization\n", __func__);
-
+	pr_debug("%s: failed initialization\n", __func__);
 	return -EINVAL;
 }
-late_initcall(exynos4_cpufreq_init);
+EXPORT_SYMBOL(exynos4210_cpufreq_init);