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author | Jaecheol Lee <jc.lee@samsung.com> | 2012-01-07 20:18:35 +0900 |
---|---|---|
committer | Dave Jones <davej@redhat.com> | 2012-01-08 23:52:40 -0500 |
commit | a125a17fa61afe2fa4e52b239dd20af8ce90c9f7 (patch) | |
tree | 8b6486baf276c61eb7cc411eec1f850eefd4a71a /drivers/cpufreq/exynos4210-cpufreq.c | |
parent | b2bd68e1d5568a3911e991fc71e083f439886d8c (diff) | |
download | linux-a125a17fa61afe2fa4e52b239dd20af8ce90c9f7.tar.gz linux-a125a17fa61afe2fa4e52b239dd20af8ce90c9f7.tar.bz2 linux-a125a17fa61afe2fa4e52b239dd20af8ce90c9f7.zip |
[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>
Diffstat (limited to 'drivers/cpufreq/exynos4210-cpufreq.c')
-rw-r--r-- | drivers/cpufreq/exynos4210-cpufreq.c | 385 |
1 files changed, 72 insertions, 313 deletions
diff --git a/drivers/cpufreq/exynos4210-cpufreq.c b/drivers/cpufreq/exynos4210-cpufreq.c index a0af2d4448a9..6bc4ada56df1 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); |