diff options
| -rw-r--r-- | arch/arm/mach-exynos/include/mach/cpufreq.h | 2 | ||||
| -rw-r--r-- | drivers/cpufreq/Kconfig.arm | 37 | ||||
| -rw-r--r-- | drivers/cpufreq/Makefile | 3 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq.c | 24 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_ondemand.c | 58 | ||||
| -rw-r--r-- | drivers/cpufreq/exynos-cpufreq.c | 6 | ||||
| -rw-r--r-- | drivers/cpufreq/exynos4210-cpufreq.c | 70 | ||||
| -rw-r--r-- | drivers/cpufreq/exynos4x12-cpufreq.c | 536 | ||||
| -rw-r--r-- | drivers/cpufreq/exynos5250-cpufreq.c | 347 | ||||
| -rw-r--r-- | drivers/cpufreq/s3c2416-cpufreq.c | 542 | ||||
| -rw-r--r-- | drivers/cpufreq/s3c64xx-cpufreq.c | 7 | ||||
| -rw-r--r-- | include/linux/cpufreq.h | 2 |
12 files changed, 1591 insertions, 43 deletions
diff --git a/arch/arm/mach-exynos/include/mach/cpufreq.h b/arch/arm/mach-exynos/include/mach/cpufreq.h index 3df27f2..7517c3f 100644 --- a/arch/arm/mach-exynos/include/mach/cpufreq.h +++ b/arch/arm/mach-exynos/include/mach/cpufreq.h @@ -32,3 +32,5 @@ struct exynos_dvfs_info { }; extern int exynos4210_cpufreq_init(struct exynos_dvfs_info *); +extern int exynos4x12_cpufreq_init(struct exynos_dvfs_info *); +extern int exynos5250_cpufreq_init(struct exynos_dvfs_info *); diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm index 82f1aa9..32d790d 100644 --- a/drivers/cpufreq/Kconfig.arm +++ b/drivers/cpufreq/Kconfig.arm @@ -7,6 +7,28 @@ config ARM_OMAP2PLUS_CPUFREQ default ARCH_OMAP2PLUS select CPU_FREQ_TABLE +config ARM_S3C2416_CPUFREQ + bool "S3C2416 CPU Frequency scaling support" + depends on CPU_S3C2416 + help + This adds the CPUFreq driver for the Samsung S3C2416 and + S3C2450 SoC. The S3C2416 supports changing the rate of the + armdiv clock source and also entering a so called dynamic + voltage scaling mode in which it is possible to reduce the + core voltage of the cpu. + + If in doubt, say N. + +config ARM_S3C2416_CPUFREQ_VCORESCALE + bool "Allow voltage scaling for S3C2416 arm core (EXPERIMENTAL)" + depends on ARM_S3C2416_CPUFREQ && REGULATOR && EXPERIMENTAL + help + Enable CPU voltage scaling when entering the dvs mode. + It uses information gathered through existing hardware and + tests but not documented in any datasheet. + + If in doubt, say N. + config ARM_S3C64XX_CPUFREQ bool "Samsung S3C64XX" depends on CPU_S3C6410 @@ -30,6 +52,8 @@ config ARM_EXYNOS_CPUFREQ bool "SAMSUNG EXYNOS SoCs" depends on ARCH_EXYNOS select ARM_EXYNOS4210_CPUFREQ if CPU_EXYNOS4210 + select ARM_EXYNOS4X12_CPUFREQ if (SOC_EXYNOS4212 || SOC_EXYNOS4412) + select ARM_EXYNOS5250_CPUFREQ if SOC_EXYNOS5250 default y help This adds the CPUFreq driver common part for Samsung @@ -39,6 +63,19 @@ config ARM_EXYNOS_CPUFREQ config ARM_EXYNOS4210_CPUFREQ bool "Samsung EXYNOS4210" + depends on ARCH_EXYNOS help This adds the CPUFreq driver for Samsung EXYNOS4210 SoC (S5PV310 or S5PC210). + +config ARM_EXYNOS4X12_CPUFREQ + bool "Samsung EXYNOS4X12" + help + This adds the CPUFreq driver for Samsung EXYNOS4X12 + SoC (EXYNOS4212 or EXYNOS4412). + +config ARM_EXYNOS5250_CPUFREQ + bool "Samsung EXYNOS5250" + help + This adds the CPUFreq driver for Samsung EXYNOS5250 + SoC. diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile index fda94c7..9531fc2 100644 --- a/drivers/cpufreq/Makefile +++ b/drivers/cpufreq/Makefile @@ -40,10 +40,13 @@ obj-$(CONFIG_X86_CPUFREQ_NFORCE2) += cpufreq-nforce2.o ################################################################################## # ARM SoC drivers obj-$(CONFIG_UX500_SOC_DB8500) += db8500-cpufreq.o +obj-$(CONFIG_ARM_S3C2416_CPUFREQ) += s3c2416-cpufreq.o obj-$(CONFIG_ARM_S3C64XX_CPUFREQ) += s3c64xx-cpufreq.o obj-$(CONFIG_ARM_S5PV210_CPUFREQ) += s5pv210-cpufreq.o obj-$(CONFIG_ARM_EXYNOS_CPUFREQ) += exynos-cpufreq.o obj-$(CONFIG_ARM_EXYNOS4210_CPUFREQ) += exynos4210-cpufreq.o +obj-$(CONFIG_ARM_EXYNOS4X12_CPUFREQ) += exynos4x12-cpufreq.o +obj-$(CONFIG_ARM_EXYNOS5250_CPUFREQ) += exynos5250-cpufreq.o obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ) += omap-cpufreq.o ################################################################################## diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c index 622013f..7f2f149 100644 --- a/drivers/cpufreq/cpufreq.c +++ b/drivers/cpufreq/cpufreq.c @@ -126,6 +126,15 @@ static int __init init_cpufreq_transition_notifier_list(void) } pure_initcall(init_cpufreq_transition_notifier_list); +static int off __read_mostly; +int cpufreq_disabled(void) +{ + return off; +} +void disable_cpufreq(void) +{ + off = 1; +} static LIST_HEAD(cpufreq_governor_list); static DEFINE_MUTEX(cpufreq_governor_mutex); @@ -1441,6 +1450,9 @@ int __cpufreq_driver_target(struct cpufreq_policy *policy, { int retval = -EINVAL; + if (cpufreq_disabled()) + return -ENODEV; + pr_debug("target for CPU %u: %u kHz, relation %u\n", policy->cpu, target_freq, relation); if (cpu_online(policy->cpu) && cpufreq_driver->target) @@ -1549,6 +1561,9 @@ int cpufreq_register_governor(struct cpufreq_governor *governor) if (!governor) return -EINVAL; + if (cpufreq_disabled()) + return -ENODEV; + mutex_lock(&cpufreq_governor_mutex); err = -EBUSY; @@ -1572,6 +1587,9 @@ void cpufreq_unregister_governor(struct cpufreq_governor *governor) if (!governor) return; + if (cpufreq_disabled()) + return; + #ifdef CONFIG_HOTPLUG_CPU for_each_present_cpu(cpu) { if (cpu_online(cpu)) @@ -1814,6 +1832,9 @@ int cpufreq_register_driver(struct cpufreq_driver *driver_data) unsigned long flags; int ret; + if (cpufreq_disabled()) + return -ENODEV; + if (!driver_data || !driver_data->verify || !driver_data->init || ((!driver_data->setpolicy) && (!driver_data->target))) return -EINVAL; @@ -1901,6 +1922,9 @@ static int __init cpufreq_core_init(void) { int cpu; + if (cpufreq_disabled()) + return -ENODEV; + for_each_possible_cpu(cpu) { per_cpu(cpufreq_policy_cpu, cpu) = -1; init_rwsem(&per_cpu(cpu_policy_rwsem, cpu)); diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index c3e0652..836e9b0 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -257,6 +257,62 @@ show_one(sampling_down_factor, sampling_down_factor); show_one(ignore_nice_load, ignore_nice); show_one(powersave_bias, powersave_bias); +/** + * update_sampling_rate - update sampling rate effective immediately if needed. + * @new_rate: new sampling rate + * + * If new rate is smaller than the old, simply updaing + * dbs_tuners_int.sampling_rate might not be appropriate. For example, + * if the original sampling_rate was 1 second and the requested new sampling + * rate is 10 ms because the user needs immediate reaction from ondemand + * governor, but not sure if higher frequency will be required or not, + * then, the governor may change the sampling rate too late; up to 1 second + * later. Thus, if we are reducing the sampling rate, we need to make the + * new value effective immediately. + */ +static void update_sampling_rate(unsigned int new_rate) +{ + int cpu; + + dbs_tuners_ins.sampling_rate = new_rate + = max(new_rate, min_sampling_rate); + + for_each_online_cpu(cpu) { + struct cpufreq_policy *policy; + struct cpu_dbs_info_s *dbs_info; + unsigned long next_sampling, appointed_at; + + policy = cpufreq_cpu_get(cpu); + if (!policy) + continue; + dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu); + cpufreq_cpu_put(policy); + + mutex_lock(&dbs_info->timer_mutex); + + if (!delayed_work_pending(&dbs_info->work)) { + mutex_unlock(&dbs_info->timer_mutex); + continue; + } + + next_sampling = jiffies + usecs_to_jiffies(new_rate); + appointed_at = dbs_info->work.timer.expires; + + + if (time_before(next_sampling, appointed_at)) { + + mutex_unlock(&dbs_info->timer_mutex); + cancel_delayed_work_sync(&dbs_info->work); + mutex_lock(&dbs_info->timer_mutex); + + schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, + usecs_to_jiffies(new_rate)); + + } + mutex_unlock(&dbs_info->timer_mutex); + } +} + static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b, const char *buf, size_t count) { @@ -265,7 +321,7 @@ static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b, ret = sscanf(buf, "%u", &input); if (ret != 1) return -EINVAL; - dbs_tuners_ins.sampling_rate = max(input, min_sampling_rate); + update_sampling_rate(input); return count; } diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c index 5467879..b243a7e 100644 --- a/drivers/cpufreq/exynos-cpufreq.c +++ b/drivers/cpufreq/exynos-cpufreq.c @@ -210,6 +210,8 @@ static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy) cpufreq_frequency_table_get_attr(exynos_info->freq_table, policy->cpu); + locking_frequency = exynos_getspeed(0); + /* set the transition latency value */ policy->cpuinfo.transition_latency = 100000; @@ -252,6 +254,10 @@ static int __init exynos_cpufreq_init(void) if (soc_is_exynos4210()) ret = exynos4210_cpufreq_init(exynos_info); + else if (soc_is_exynos4212() || soc_is_exynos4412()) + ret = exynos4x12_cpufreq_init(exynos_info); + else if (soc_is_exynos5250()) + ret = exynos5250_cpufreq_init(exynos_info); else pr_err("%s: CPU type not found\n", __func__); diff --git a/drivers/cpufreq/exynos4210-cpufreq.c b/drivers/cpufreq/exynos4210-cpufreq.c index 065da5b..fb148fa 100644 --- a/drivers/cpufreq/exynos4210-cpufreq.c +++ b/drivers/cpufreq/exynos4210-cpufreq.c @@ -121,25 +121,25 @@ static void exynos4210_set_clkdiv(unsigned int div_index) tmp = exynos4210_clkdiv_table[div_index].clkdiv; - __raw_writel(tmp, S5P_CLKDIV_CPU); + __raw_writel(tmp, EXYNOS4_CLKDIV_CPU); do { - tmp = __raw_readl(S5P_CLKDIV_STATCPU); + tmp = __raw_readl(EXYNOS4_CLKDIV_STATCPU); } while (tmp & 0x1111111); /* Change Divider - CPU1 */ - tmp = __raw_readl(S5P_CLKDIV_CPU1); + tmp = __raw_readl(EXYNOS4_CLKDIV_CPU1); tmp &= ~((0x7 << 4) | 0x7); tmp |= ((clkdiv_cpu1[div_index][0] << 4) | (clkdiv_cpu1[div_index][1] << 0)); - __raw_writel(tmp, S5P_CLKDIV_CPU1); + __raw_writel(tmp, EXYNOS4_CLKDIV_CPU1); do { - tmp = __raw_readl(S5P_CLKDIV_STATCPU1); + tmp = __raw_readl(EXYNOS4_CLKDIV_STATCPU1); } while (tmp & 0x11); } @@ -151,32 +151,32 @@ static void exynos4210_set_apll(unsigned int index) clk_set_parent(moutcore, mout_mpll); do { - tmp = (__raw_readl(S5P_CLKMUX_STATCPU) - >> S5P_CLKSRC_CPU_MUXCORE_SHIFT); + tmp = (__raw_readl(EXYNOS4_CLKMUX_STATCPU) + >> EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT); tmp &= 0x7; } while (tmp != 0x2); /* 2. Set APLL Lock time */ - __raw_writel(S5P_APLL_LOCKTIME, S5P_APLL_LOCK); + __raw_writel(EXYNOS4_APLL_LOCKTIME, EXYNOS4_APLL_LOCK); /* 3. Change PLL PMS values */ - tmp = __raw_readl(S5P_APLL_CON0); + tmp = __raw_readl(EXYNOS4_APLL_CON0); tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0)); tmp |= exynos4210_apll_pms_table[index]; - __raw_writel(tmp, S5P_APLL_CON0); + __raw_writel(tmp, EXYNOS4_APLL_CON0); /* 4. wait_lock_time */ do { - tmp = __raw_readl(S5P_APLL_CON0); - } while (!(tmp & (0x1 << S5P_APLLCON0_LOCKED_SHIFT))); + tmp = __raw_readl(EXYNOS4_APLL_CON0); + } while (!(tmp & (0x1 << EXYNOS4_APLLCON0_LOCKED_SHIFT))); /* 5. MUX_CORE_SEL = APLL */ clk_set_parent(moutcore, mout_apll); do { - tmp = __raw_readl(S5P_CLKMUX_STATCPU); - tmp &= S5P_CLKMUX_STATCPU_MUXCORE_MASK; - } while (tmp != (0x1 << S5P_CLKSRC_CPU_MUXCORE_SHIFT)); + tmp = __raw_readl(EXYNOS4_CLKMUX_STATCPU); + tmp &= EXYNOS4_CLKMUX_STATCPU_MUXCORE_MASK; + } while (tmp != (0x1 << EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT)); } bool exynos4210_pms_change(unsigned int old_index, unsigned int new_index) @@ -198,10 +198,10 @@ static void exynos4210_set_frequency(unsigned int old_index, exynos4210_set_clkdiv(new_index); /* 2. Change just s value in apll m,p,s value */ - tmp = __raw_readl(S5P_APLL_CON0); + tmp = __raw_readl(EXYNOS4_APLL_CON0); tmp &= ~(0x7 << 0); tmp |= (exynos4210_apll_pms_table[new_index] & 0x7); - __raw_writel(tmp, S5P_APLL_CON0); + __raw_writel(tmp, EXYNOS4_APLL_CON0); } else { /* Clock Configuration Procedure */ /* 1. Change the system clock divider values */ @@ -212,10 +212,10 @@ static void exynos4210_set_frequency(unsigned int old_index, } else if (old_index < new_index) { 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 = __raw_readl(EXYNOS4_APLL_CON0); tmp &= ~(0x7 << 0); tmp |= (exynos4210_apll_pms_table[new_index] & 0x7); - __raw_writel(tmp, S5P_APLL_CON0); + __raw_writel(tmp, EXYNOS4_APLL_CON0); /* 2. Change the system clock divider values */ exynos4210_set_clkdiv(new_index); @@ -253,24 +253,24 @@ int exynos4210_cpufreq_init(struct exynos_dvfs_info *info) if (IS_ERR(mout_apll)) goto err_mout_apll; - tmp = __raw_readl(S5P_CLKDIV_CPU); + tmp = __raw_readl(EXYNOS4_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); - - tmp |= ((clkdiv_cpu0[i][0] << S5P_CLKDIV_CPU0_CORE_SHIFT) | - (clkdiv_cpu0[i][1] << S5P_CLKDIV_CPU0_COREM0_SHIFT) | - (clkdiv_cpu0[i][2] << S5P_CLKDIV_CPU0_COREM1_SHIFT) | - (clkdiv_cpu0[i][3] << S5P_CLKDIV_CPU0_PERIPH_SHIFT) | - (clkdiv_cpu0[i][4] << S5P_CLKDIV_CPU0_ATB_SHIFT) | - (clkdiv_cpu0[i][5] << S5P_CLKDIV_CPU0_PCLKDBG_SHIFT) | - (clkdiv_cpu0[i][6] << S5P_CLKDIV_CPU0_APLL_SHIFT)); + tmp &= ~(EXYNOS4_CLKDIV_CPU0_CORE_MASK | + EXYNOS4_CLKDIV_CPU0_COREM0_MASK | + EXYNOS4_CLKDIV_CPU0_COREM1_MASK | + EXYNOS4_CLKDIV_CPU0_PERIPH_MASK | + EXYNOS4_CLKDIV_CPU0_ATB_MASK | + EXYNOS4_CLKDIV_CPU0_PCLKDBG_MASK | + EXYNOS4_CLKDIV_CPU0_APLL_MASK); + + tmp |= ((clkdiv_cpu0[i][0] << EXYNOS4_CLKDIV_CPU0_CORE_SHIFT) | + (clkdiv_cpu0[i][1] << EXYNOS4_CLKDIV_CPU0_COREM0_SHIFT) | + (clkdiv_cpu0[i][2] << EXYNOS4_CLKDIV_CPU0_COREM1_SHIFT) | + (clkdiv_cpu0[i][3] << EXYNOS4_CLKDIV_CPU0_PERIPH_SHIFT) | + (clkdiv_cpu0[i][4] << EXYNOS4_CLKDIV_CPU0_ATB_SHIFT) | + (clkdiv_cpu0[i][5] << EXYNOS4_CLKDIV_CPU0_PCLKDBG_SHIFT) | + (clkdiv_cpu0[i][6] << EXYNOS4_CLKDIV_CPU0_APLL_SHIFT)); exynos4210_clkdiv_table[i].clkdiv = tmp; } diff --git a/drivers/cpufreq/exynos4x12-cpufreq.c b/drivers/cpufreq/exynos4x12-cpufreq.c new file mode 100644 index 0000000..8c5a7af --- /dev/null +++ b/drivers/cpufreq/exynos4x12-cpufreq.c @@ -0,0 +1,536 @@ +/* + * Copyright (c) 2010-2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * EXYNOS4X12 - 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 + * published by the Free Software Foundation. +*/ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/cpufreq.h> + +#include <mach/regs-clock.h> +#include <mach/cpufreq.h> + +#define CPUFREQ_LEVEL_END (L13 + 1) + +static int max_support_idx; +static int min_support_idx = (CPUFREQ_LEVEL_END - 1); + +static struct clk *cpu_clk; +static struct clk *moutcore; +static struct clk *mout_mpll; +static struct clk *mout_apll; + +struct cpufreq_clkdiv { + unsigned int index; + unsigned int clkdiv; + unsigned int clkdiv1; +}; + +static unsigned int exynos4x12_volt_table[CPUFREQ_LEVEL_END]; + +static struct cpufreq_frequency_table exynos4x12_freq_table[] = { + {L0, 1500 * 1000}, + {L1, 1400 * 1000}, + {L2, 1300 * 1000}, + {L3, 1200 * 1000}, + {L4, 1100 * 1000}, + {L5, 1000 * 1000}, + {L6, 900 * 1000}, + {L7, 800 * 1000}, + {L8, 700 * 1000}, + {L9, 600 * 1000}, + {L10, 500 * 1000}, + {L11, 400 * 1000}, + {L12, 300 * 1000}, + {L13, 200 * 1000}, + {0, CPUFREQ_TABLE_END}, +}; + +static struct cpufreq_clkdiv exynos4x12_clkdiv_table[CPUFREQ_LEVEL_END]; + +static unsigned int clkdiv_cpu0_4212[CPUFREQ_LEVEL_END][8] = { + /* + * Clock divider value for following + * { DIVCORE, DIVCOREM0, DIVCOREM1, DIVPERIPH, + * DIVATB, DIVPCLK_DBG, DIVAPLL, DIVCORE2 } + */ + /* ARM L0: 1500 MHz */ + { 0, 3, 7, 0, 6, 1, 2, 0 }, + + /* ARM L1: 1400 MHz */ + { 0, 3, 7, 0, 6, 1, 2, 0 }, + + /* ARM L2: 1300 MHz */ + { 0, 3, 7, 0, 5, 1, 2, 0 }, + + /* ARM L3: 1200 MHz */ + { 0, 3, 7, 0, 5, 1, 2, 0 }, + + /* ARM L4: 1100 MHz */ + { 0, 3, 6, 0, 4, 1, 2, 0 }, + + /* ARM L5: 1000 MHz */ + { 0, 2, 5, 0, 4, 1, 1, 0 }, + + /* ARM L6: 900 MHz */ + { 0, 2, 5, 0, 3, 1, 1, 0 }, + + /* ARM L7: 800 MHz */ + { 0, 2, 5, 0, 3, 1, 1, 0 }, + + /* ARM L8: 700 MHz */ + { 0, 2, 4, 0, 3, 1, 1, 0 }, + + /* ARM L9: 600 MHz */ + { 0, 2, 4, 0, 3, 1, 1, 0 }, + + /* ARM L10: 500 MHz */ + { 0, 2, 4, 0, 3, 1, 1, 0 }, + + /* ARM L11: 400 MHz */ + { 0, 2, 4, 0, 3, 1, 1, 0 }, + + /* ARM L12: 300 MHz */ + { 0, 2, 4, 0, 2, 1, 1, 0 }, + + /* ARM L13: 200 MHz */ + { 0, 1, 3, 0, 1, 1, 1, 0 }, +}; + +static unsigned int clkdiv_cpu0_4412[CPUFREQ_LEVEL_END][8] = { + /* + * Clock divider value for following + * { DIVCORE, DIVCOREM0, DIVCOREM1, DIVPERIPH, + * DIVATB, DIVPCLK_DBG, DIVAPLL, DIVCORE2 } + */ + /* ARM L0: 1500 MHz */ + { 0, 3, 7, 0, 6, 1, 2, 0 }, + + /* ARM L1: 1400 MHz */ + { 0, 3, 7, 0, 6, 1, 2, 0 }, + + /* ARM L2: 1300 MHz */ + { 0, 3, 7, 0, 5, 1, 2, 0 }, + + /* ARM L3: 1200 MHz */ + { 0, 3, 7, 0, 5, 1, 2, 0 }, + + /* ARM L4: 1100 MHz */ + { 0, 3, 6, 0, 4, 1, 2, 0 }, + + /* ARM L5: 1000 MHz */ + { 0, 2, 5, 0, 4, 1, 1, 0 }, + + /* ARM L6: 900 MHz */ + { 0, 2, 5, 0, 3, 1, 1, 0 }, + + /* ARM L7: 800 MHz */ + { 0, 2, 5, 0, 3, 1, 1, 0 }, + + /* ARM L8: 700 MHz */ + { 0, 2, 4, 0, 3, 1, 1, 0 }, + + /* ARM L9: 600 MHz */ + { 0, 2, 4, 0, 3, 1, 1, 0 }, + + /* ARM L10: 500 MHz */ + { 0, 2, 4, 0, 3, 1, 1, 0 }, + + /* ARM L11: 400 MHz */ + { 0, 2, 4, 0, 3, 1, 1, 0 }, + + /* ARM L12: 300 MHz */ + { 0, 2, 4, 0, 2, 1, 1, 0 }, + + /* ARM L13: 200 MHz */ + { 0, 1, 3, 0, 1, 1, 1, 0 }, +}; + +static unsigned int clkdiv_cpu1_4212[CPUFREQ_LEVEL_END][2] = { + /* Clock divider value for following + * { DIVCOPY, DIVHPM } + */ + /* ARM L0: 1500 MHz */ + { 6, 0 }, + + /* ARM L1: 1400 MHz */ + { 6, 0 }, + + /* ARM L2: 1300 MHz */ + { 5, 0 }, + + /* ARM L3: 1200 MHz */ + { 5, 0 }, + + /* ARM L4: 1100 MHz */ + { 4, 0 }, + + /* ARM L5: 1000 MHz */ + { 4, 0 }, + + /* ARM L6: 900 MHz */ + { 3, 0 }, + + /* ARM L7: 800 MHz */ + { 3, 0 }, + + /* ARM L8: 700 MHz */ + { 3, 0 }, + + /* ARM L9: 600 MHz */ + { 3, 0 }, + + /* ARM L10: 500 MHz */ + { 3, 0 }, + + /* ARM L11: 400 MHz */ + { 3, 0 }, + + /* ARM L12: 300 MHz */ + { 3, 0 }, + + /* ARM L13: 200 MHz */ + { 3, 0 }, +}; + +static unsigned int clkdiv_cpu1_4412[CPUFREQ_LEVEL_END][3] = { + /* Clock divider value for following + * { DIVCOPY, DIVHPM, DIVCORES } + */ + /* ARM L0: 1500 MHz */ + { 6, 0, 7 }, + + /* ARM L1: 1400 MHz */ + { 6, 0, 6 }, + + /* ARM L2: 1300 MHz */ + { 5, 0, 6 }, + + /* ARM L3: 1200 MHz */ + { 5, 0, 5 }, + + /* ARM L4: 1100 MHz */ + { 4, 0, 5 }, + + /* ARM L5: 1000 MHz */ + { 4, 0, 4 }, + + /* ARM L6: 900 MHz */ + { 3, 0, 4 }, + + /* ARM L7: 800 MHz */ + { 3, 0, 3 }, + + /* ARM L8: 700 MHz */ + { 3, 0, 3 }, + + /* ARM L9: 600 MHz */ + { 3, 0, 2 }, + + /* ARM L10: 500 MHz */ + { 3, 0, 2 }, + + /* ARM L11: 400 MHz */ + { 3, 0, 1 }, + + /* ARM L12: 300 MHz */ + { 3, 0, 1 }, + + /* ARM L13: 200 MHz */ + { 3, 0, 0 }, +}; + +static unsigned int exynos4x12_apll_pms_table[CPUFREQ_LEVEL_END] = { + /* APLL FOUT L0: 1500 MHz */ + ((250 << 16) | (4 << 8) | (0x0)), + + /* APLL FOUT L1: 1400 MHz */ + ((175 << 16) | (3 << 8) | (0x0)), + + /* APLL FOUT L2: 1300 MHz */ + ((325 << 16) | (6 << 8) | (0x0)), + + /* APLL FOUT L3: 1200 MHz */ + ((200 << 16) | (4 << 8) | (0x0)), + + /* APLL FOUT L4: 1100 MHz */ + ((275 << 16) | (6 << 8) | (0x0)), + + /* APLL FOUT L5: 1000 MHz */ + ((125 << 16) | (3 << 8) | (0x0)), + + /* APLL FOUT L6: 900 MHz */ + ((150 << 16) | (4 << 8) | (0x0)), + + /* APLL FOUT L7: 800 MHz */ + ((100 << 16) | (3 << 8) | (0x0)), + + /* APLL FOUT L8: 700 MHz */ + ((175 << 16) | (3 << 8) | (0x1)), + + /* APLL FOUT L9: 600 MHz */ + ((200 << 16) | (4 << 8) | (0x1)), + + /* APLL FOUT L10: 500 MHz */ + ((125 << 16) | (3 << 8) | (0x1)), + + /* APLL FOUT L11 400 MHz */ + ((100 << 16) | (3 << 8) | (0x1)), + + /* APLL FOUT L12: 300 MHz */ + ((200 << 16) | (4 << 8) | (0x2)), + + /* APLL FOUT L13: 200 MHz */ + ((100 << 16) | (3 << 8) | (0x2)), +}; + +static const unsigned int asv_voltage_4x12[CPUFREQ_LEVEL_END] = { + 1350000, 1287500, 1250000, 1187500, 1137500, 1087500, 1037500, + 1000000, 987500, 975000, 950000, 925000, 900000, 900000 +}; + +static void exynos4x12_set_clkdiv(unsigned int div_index) +{ + unsigned int tmp; + unsigned int stat_cpu1; + + /* Change Divider - CPU0 */ + + tmp = exynos4x12_clkdiv_table[div_index].clkdiv; + + __raw_writel(tmp, EXYNOS4_CLKDIV_CPU); + + while (__raw_readl(EXYNOS4_CLKDIV_STATCPU) & 0x11111111) + cpu_relax(); + + /* Change Divider - CPU1 */ + tmp = exynos4x12_clkdiv_table[div_index].clkdiv1; + + __raw_writel(tmp, EXYNOS4_CLKDIV_CPU1); + if (soc_is_exynos4212()) + stat_cpu1 = 0x11; + else + stat_cpu1 = 0x111; + + while (__raw_readl(EXYNOS4_CLKDIV_STATCPU1) & stat_cpu1) + cpu_relax(); +} + +static void exynos4x12_set_apll(unsigned int index) +{ + unsigned int tmp, pdiv; + + /* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */ + clk_set_parent(moutcore, mout_mpll); + + do { + cpu_relax(); + tmp = (__raw_readl(EXYNOS4_CLKMUX_STATCPU) + >> EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT); + tmp &= 0x7; + } while (tmp != 0x2); + + /* 2. Set APLL Lock time */ + pdiv = ((exynos4x12_apll_pms_table[index] >> 8) & 0x3f); + + __raw_writel((pdiv * 250), EXYNOS4_APLL_LOCK); + + /* 3. Change PLL PMS values */ + tmp = __raw_readl(EXYNOS4_APLL_CON0); + tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0)); + tmp |= exynos4x12_apll_pms_table[index]; + __raw_writel(tmp, EXYNOS4_APLL_CON0); + + /* 4. wait_lock_time */ + do { + cpu_relax(); + tmp = __raw_readl(EXYNOS4_APLL_CON0); + } while (!(tmp & (0x1 << EXYNOS4_APLLCON0_LOCKED_SHIFT))); + + /* 5. MUX_CORE_SEL = APLL */ + clk_set_parent(moutcore, mout_apll); + + do { + cpu_relax(); + tmp = __raw_readl(EXYNOS4_CLKMUX_STATCPU); + tmp &= EXYNOS4_CLKMUX_STATCPU_MUXCORE_MASK; + } while (tmp != (0x1 << EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT)); +} + +bool exynos4x12_pms_change(unsigned int old_index, unsigned int new_index) +{ + unsigned int old_pm = exynos4x12_apll_pms_table[old_index] >> 8; + unsigned int new_pm = exynos4x12_apll_pms_table[new_index] >> 8; + + return (old_pm == new_pm) ? 0 : 1; +} + +static void exynos4x12_set_frequency(unsigned int old_index, + unsigned int new_index) +{ + unsigned int tmp; + + if (old_index > new_index) { + if (!exynos4x12_pms_change(old_index, new_index)) { + /* 1. Change the system clock divider values */ + exynos4x12_set_clkdiv(new_index); + /* 2. Change just s value in apll m,p,s value */ + tmp = __raw_readl(EXYNOS4_APLL_CON0); + tmp &= ~(0x7 << 0); + tmp |= (exynos4x12_apll_pms_table[new_index] & 0x7); + __raw_writel(tmp, EXYNOS4_APLL_CON0); + + } else { + /* Clock Configuration Procedure */ + /* 1. Change the system clock divider values */ + exynos4x12_set_clkdiv(new_index); + /* 2. Change the apll m,p,s value */ + exynos4x12_set_apll(new_index); + } + } else if (old_index < new_index) { + if (!exynos4x12_pms_change(old_index, new_index)) { + /* 1. Change just s value in apll m,p,s value */ + tmp = __raw_readl(EXYNOS4_APLL_CON0); + tmp &= ~(0x7 << 0); + tmp |= (exynos4x12_apll_pms_table[new_index] & 0x7); + __raw_writel(tmp, EXYNOS4_APLL_CON0); + /* 2. Change the system clock divider values */ + exynos4x12_set_clkdiv(new_index); + } else { + /* Clock Configuration Procedure */ + /* 1. Change the apll m,p,s value */ + exynos4x12_set_apll(new_index); + /* 2. Change the system clock divider values */ + exynos4x12_set_clkdiv(new_index); + } + } +} + +static void __init set_volt_table(void) +{ + unsigned int i; + + max_support_idx = L1; + + /* Not supported */ + exynos4x12_freq_table[L0].frequency = CPUFREQ_ENTRY_INVALID; + + for (i = 0 ; i < CPUFREQ_LEVEL_END ; i++) + exynos4x12_volt_table[i] = asv_voltage_4x12[i]; +} + +int exynos4x12_cpufreq_init(struct exynos_dvfs_info *info) +{ + int i; + unsigned int tmp; + unsigned long rate; + + set_volt_table(); + + cpu_clk = clk_get(NULL, "armclk"); + if (IS_ERR(cpu_clk)) + return PTR_ERR(cpu_clk); + + moutcore = clk_get(NULL, "moutcore"); + if (IS_ERR(moutcore)) + goto err_moutcore; + + mout_mpll = clk_get(NULL, "mout_mpll"); + if (IS_ERR(mout_mpll)) + goto err_mout_mpll; + + rate = clk_get_rate(mout_mpll) / 1000; + + mout_apll = clk_get(NULL, "mout_apll"); + if (IS_ERR(mout_apll)) + goto err_mout_apll; + + for (i = L0; i < CPUFREQ_LEVEL_END; i++) { + + exynos4x12_clkdiv_table[i].index = i; + + tmp = __raw_readl(EXYNOS4_CLKDIV_CPU); + + tmp &= ~(EXYNOS4_CLKDIV_CPU0_CORE_MASK | + EXYNOS4_CLKDIV_CPU0_COREM0_MASK | + EXYNOS4_CLKDIV_CPU0_COREM1_MASK | + EXYNOS4_CLKDIV_CPU0_PERIPH_MASK | + EXYNOS4_CLKDIV_CPU0_ATB_MASK | + EXYNOS4_CLKDIV_CPU0_PCLKDBG_MASK | + EXYNOS4_CLKDIV_CPU0_APLL_MASK); + + if (soc_is_exynos4212()) { + tmp |= ((clkdiv_cpu0_4212[i][0] << EXYNOS4_CLKDIV_CPU0_CORE_SHIFT) | + (clkdiv_cpu0_4212[i][1] << EXYNOS4_CLKDIV_CPU0_COREM0_SHIFT) | + (clkdiv_cpu0_4212[i][2] << EXYNOS4_CLKDIV_CPU0_COREM1_SHIFT) | + (clkdiv_cpu0_4212[i][3] << EXYNOS4_CLKDIV_CPU0_PERIPH_SHIFT) | + (clkdiv_cpu0_4212[i][4] << EXYNOS4_CLKDIV_CPU0_ATB_SHIFT) | + (clkdiv_cpu0_4212[i][5] << EXYNOS4_CLKDIV_CPU0_PCLKDBG_SHIFT) | + (clkdiv_cpu0_4212[i][6] << EXYNOS4_CLKDIV_CPU0_APLL_SHIFT)); + } else { + tmp &= ~EXYNOS4_CLKDIV_CPU0_CORE2_MASK; + + tmp |= ((clkdiv_cpu0_4412[i][0] << EXYNOS4_CLKDIV_CPU0_CORE_SHIFT) | + (clkdiv_cpu0_4412[i][1] << EXYNOS4_CLKDIV_CPU0_COREM0_SHIFT) | + (clkdiv_cpu0_4412[i][2] << EXYNOS4_CLKDIV_CPU0_COREM1_SHIFT) | + (clkdiv_cpu0_4412[i][3] << EXYNOS4_CLKDIV_CPU0_PERIPH_SHIFT) | + (clkdiv_cpu0_4412[i][4] << EXYNOS4_CLKDIV_CPU0_ATB_SHIFT) | + (clkdiv_cpu0_4412[i][5] << EXYNOS4_CLKDIV_CPU0_PCLKDBG_SHIFT) | + (clkdiv_cpu0_4412[i][6] << EXYNOS4_CLKDIV_CPU0_APLL_SHIFT) | + (clkdiv_cpu0_4412[i][7] << EXYNOS4_CLKDIV_CPU0_CORE2_SHIFT)); + } + + exynos4x12_clkdiv_table[i].clkdiv = tmp; + + tmp = __raw_readl(EXYNOS4_CLKDIV_CPU1); + + if (soc_is_exynos4212()) { + tmp &= ~(EXYNOS4_CLKDIV_CPU1_COPY_MASK | + EXYNOS4_CLKDIV_CPU1_HPM_MASK); + tmp |= ((clkdiv_cpu1_4212[i][0] << EXYNOS4_CLKDIV_CPU1_COPY_SHIFT) | + (clkdiv_cpu1_4212[i][1] << EXYNOS4_CLKDIV_CPU1_HPM_SHIFT)); + } else { + tmp &= ~(EXYNOS4_CLKDIV_CPU1_COPY_MASK | + EXYNOS4_CLKDIV_CPU1_HPM_MASK | + EXYNOS4_CLKDIV_CPU1_CORES_MASK); + tmp |= ((clkdiv_cpu1_4412[i][0] << EXYNOS4_CLKDIV_CPU1_COPY_SHIFT) | + (clkdiv_cpu1_4412[i][1] << EXYNOS4_CLKDIV_CPU1_HPM_SHIFT) | + (clkdiv_cpu1_4412[i][2] << EXYNOS4_CLKDIV_CPU1_CORES_SHIFT)); + } + exynos4x12_clkdiv_table[i].clkdiv1 = tmp; + } + + info->mpll_freq_khz = rate; + info->pm_lock_idx = L5; + info->pll_safe_idx = L7; + info->max_support_idx = max_support_idx; + info->min_support_idx = min_support_idx; + info->cpu_clk = cpu_clk; + info->volt_table = exynos4x12_volt_table; + info->freq_table = exynos4x12_freq_table; + info->set_freq = exynos4x12_set_frequency; + info->need_apll_change = exynos4x12_pms_change; + + return 0; + +err_mout_apll: + clk_put(mout_mpll); +err_mout_mpll: + clk_put(moutcore); +err_moutcore: + clk_put(cpu_clk); + + pr_debug("%s: failed initialization\n", __func__); + return -EINVAL; +} +EXPORT_SYMBOL(exynos4x12_cpufreq_init); diff --git a/drivers/cpufreq/exynos5250-cpufreq.c b/drivers/cpufreq/exynos5250-cpufreq.c new file mode 100644 index 0000000..a883316 --- /dev/null +++ b/drivers/cpufreq/exynos5250-cpufreq.c @@ -0,0 +1,347 @@ +/* + * Copyright (c) 2010-20122Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * EXYNOS5250 - 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 + * published by the Free Software Foundation. +*/ + +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/err.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/cpufreq.h> + +#include <mach/map.h> +#include <mach/regs-clock.h> +#include <mach/cpufreq.h> + +#define CPUFREQ_LEVEL_END (L15 + 1) + +static int max_support_idx; +static int min_support_idx = (CPUFREQ_LEVEL_END - 1); +static struct clk *cpu_clk; +static struct clk *moutcore; +static struct clk *mout_mpll; +static struct clk *mout_apll; + +struct cpufreq_clkdiv { + unsigned int index; + unsigned int clkdiv; + unsigned int clkdiv1; +}; + +static unsigned int exynos5250_volt_table[CPUFREQ_LEVEL_END]; + +static struct cpufreq_frequency_table exynos5250_freq_table[] = { + {L0, 1700 * 1000}, + {L1, 1600 * 1000}, + {L2, 1500 * 1000}, + {L3, 1400 * 1000}, + {L4, 1300 * 1000}, + {L5, 1200 * 1000}, + {L6, 1100 * 1000}, + {L7, 1000 * 1000}, + {L8, 900 * 1000}, + {L9, 800 * 1000}, + {L10, 700 * 1000}, + {L11, 600 * 1000}, + {L12, 500 * 1000}, + {L13, 400 * 1000}, + {L14, 300 * 1000}, + {L15, 200 * 1000}, + {0, CPUFREQ_TABLE_END}, +}; + +static struct cpufreq_clkdiv exynos5250_clkdiv_table[CPUFREQ_LEVEL_END]; + +static unsigned int clkdiv_cpu0_5250[CPUFREQ_LEVEL_END][8] = { + /* + * Clock divider value for following + * { ARM, CPUD, ACP, PERIPH, ATB, PCLK_DBG, APLL, ARM2 } + */ + { 0, 3, 7, 7, 6, 1, 3, 0 }, /* 1700 MHz - N/A */ + { 0, 3, 7, 7, 6, 1, 3, 0 }, /* 1600 MHz - N/A */ + { 0, 3, 7, 7, 5, 1, 3, 0 }, /* 1500 MHz - N/A */ + { 0, 3, 7, 7, 6, 1, 3, 0 }, /* 1400 MHz */ + { 0, 3, 7, 7, 6, 1, 3, 0 }, /* 1300 MHz */ + { 0, 3, 7, 7, 5, 1, 3, 0 }, /* 1200 MHz */ + { 0, 2, 7, 7, 5, 1, 2, 0 }, /* 1100 MHz */ + { 0, 2, 7, 7, 4, 1, 2, 0 }, /* 1000 MHz */ + { 0, 2, 7, 7, 4, 1, 2, 0 }, /* 900 MHz */ + { 0, 2, 7, 7, 3, 1, 1, 0 }, /* 800 MHz */ + { 0, 1, 7, 7, 3, 1, 1, 0 }, /* 700 MHz */ + { 0, 1, 7, 7, 2, 1, 1, 0 }, /* 600 MHz */ + { 0, 1, 7, 7, 2, 1, 1, 0 }, /* 500 MHz */ + { 0, 1, 7, 7, 1, 1, 1, 0 }, /* 400 MHz */ + { 0, 1, 7, 7, 1, 1, 1, 0 }, /* 300 MHz */ + { 0, 1, 7, 7, 1, 1, 1, 0 }, /* 200 MHz */ +}; + +static unsigned int clkdiv_cpu1_5250[CPUFREQ_LEVEL_END][2] = { + /* Clock divider value for following + * { COPY, HPM } + */ + { 0, 2 }, /* 1700 MHz - N/A */ + { 0, 2 }, /* 1600 MHz - N/A */ + { 0, 2 }, /* 1500 MHz - N/A */ + { 0, 2 }, /* 1400 MHz */ + { 0, 2 }, /* 1300 MHz */ + { 0, 2 }, /* 1200 MHz */ + { 0, 2 }, /* 1100 MHz */ + { 0, 2 }, /* 1000 MHz */ + { 0, 2 }, /* 900 MHz */ + { 0, 2 }, /* 800 MHz */ + { 0, 2 }, /* 700 MHz */ + { 0, 2 }, /* 600 MHz */ + { 0, 2 }, /* 500 MHz */ + { 0, 2 }, /* 400 MHz */ + { 0, 2 }, /* 300 MHz */ + { 0, 2 }, /* 200 MHz */ +}; + +static unsigned int exynos5_apll_pms_table[CPUFREQ_LEVEL_END] = { + (0), /* 1700 MHz - N/A */ + (0), /* 1600 MHz - N/A */ + (0), /* 1500 MHz - N/A */ + (0), /* 1400 MHz */ + ((325 << 16) | (6 << 8) | 0), /* 1300 MHz */ + ((200 << 16) | (4 << 8) | 0), /* 1200 MHz */ + ((275 << 16) | (6 << 8) | 0), /* 1100 MHz */ + ((125 << 16) | (3 << 8) | 0), /* 1000 MHz */ + ((150 << 16) | (4 << 8) | 0), /* 900 MHz */ + ((100 << 16) | (3 << 8) | 0), /* 800 MHz */ + ((175 << 16) | (3 << 8) | 1), /* 700 MHz */ + ((200 << 16) | (4 << 8) | 1), /* 600 MHz */ + ((125 << 16) | (3 << 8) | 1), /* 500 MHz */ + ((100 << 16) | (3 << 8) | 1), /* 400 MHz */ + ((200 << 16) | (4 << 8) | 2), /* 300 MHz */ + ((100 << 16) | (3 << 8) | 2), /* 200 MHz */ +}; + +/* ASV group voltage table */ +static const unsigned int asv_voltage_5250[CPUFREQ_LEVEL_END] = { + 0, 0, 0, 0, 0, 0, 0, /* 1700 MHz ~ 1100 MHz Not supported */ + 1175000, 1125000, 1075000, 1050000, 1000000, + 950000, 925000, 925000, 900000 +}; + +static void set_clkdiv(unsigned int div_index) +{ + unsigned int tmp; + + /* Change Divider - CPU0 */ + + tmp = exynos5250_clkdiv_table[div_index].clkdiv; + + __raw_writel(tmp, EXYNOS5_CLKDIV_CPU0); + + while (__raw_readl(EXYNOS5_CLKDIV_STATCPU0) & 0x11111111) + cpu_relax(); + + /* Change Divider - CPU1 */ + tmp = exynos5250_clkdiv_table[div_index].clkdiv1; + + __raw_writel(tmp, EXYNOS5_CLKDIV_CPU1); + + while (__raw_readl(EXYNOS5_CLKDIV_STATCPU1) & 0x11) + cpu_relax(); +} + +static void set_apll(unsigned int new_index, + unsigned int old_index) +{ + unsigned int tmp, pdiv; + + /* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */ + clk_set_parent(moutcore, mout_mpll); + + do { + cpu_relax(); + tmp = (__raw_readl(EXYNOS5_CLKMUX_STATCPU) >> 16); + tmp &= 0x7; + } while (tmp != 0x2); + + /* 2. Set APLL Lock time */ + pdiv = ((exynos5_apll_pms_table[new_index] >> 8) & 0x3f); + + __raw_writel((pdiv * 250), EXYNOS5_APLL_LOCK); + + /* 3. Change PLL PMS values */ + tmp = __raw_readl(EXYNOS5_APLL_CON0); + tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0)); + tmp |= exynos5_apll_pms_table[new_index]; + __raw_writel(tmp, EXYNOS5_APLL_CON0); + + /* 4. wait_lock_time */ + do { + cpu_relax(); + tmp = __raw_readl(EXYNOS5_APLL_CON0); + } while (!(tmp & (0x1 << 29))); + + /* 5. MUX_CORE_SEL = APLL */ + clk_set_parent(moutcore, mout_apll); + + do { + cpu_relax(); + tmp = __raw_readl(EXYNOS5_CLKMUX_STATCPU); + tmp &= (0x7 << 16); + } while (tmp != (0x1 << 16)); + +} + +bool exynos5250_pms_change(unsigned int old_index, unsigned int new_index) +{ + unsigned int old_pm = (exynos5_apll_pms_table[old_index] >> 8); + unsigned int new_pm = (exynos5_apll_pms_table[new_index] >> 8); + + return (old_pm == new_pm) ? 0 : 1; +} + +static void exynos5250_set_frequency(unsigned int old_index, + unsigned int new_index) +{ + unsigned int tmp; + + if (old_index > new_index) { + if (!exynos5250_pms_change(old_index, new_index)) { + /* 1. Change the system clock divider values */ + set_clkdiv(new_index); + /* 2. Change just s value in apll m,p,s value */ + tmp = __raw_readl(EXYNOS5_APLL_CON0); + tmp &= ~(0x7 << 0); + tmp |= (exynos5_apll_pms_table[new_index] & 0x7); + __raw_writel(tmp, EXYNOS5_APLL_CON0); + + } else { + /* Clock Configuration Procedure */ + /* 1. Change the system clock divider values */ + set_clkdiv(new_index); + /* 2. Change the apll m,p,s value */ + set_apll(new_index, old_index); + } + } else if (old_index < new_index) { + if (!exynos5250_pms_change(old_index, new_index)) { + /* 1. Change just s value in apll m,p,s value */ + tmp = __raw_readl(EXYNOS5_APLL_CON0); + tmp &= ~(0x7 << 0); + tmp |= (exynos5_apll_pms_table[new_index] & 0x7); + __raw_writel(tmp, EXYNOS5_APLL_CON0); + /* 2. Change the system clock divider values */ + set_clkdiv(new_index); + } else { + /* Clock Configuration Procedure */ + /* 1. Change the apll m,p,s value */ + set_apll(new_index, old_index); + /* 2. Change the system clock divider values */ + set_clkdiv(new_index); + } + } +} + +static void __init set_volt_table(void) +{ + unsigned int i; + + exynos5250_freq_table[L0].frequency = CPUFREQ_ENTRY_INVALID; + exynos5250_freq_table[L1].frequency = CPUFREQ_ENTRY_INVALID; + exynos5250_freq_table[L2].frequency = CPUFREQ_ENTRY_INVALID; + exynos5250_freq_table[L3].frequency = CPUFREQ_ENTRY_INVALID; + exynos5250_freq_table[L4].frequency = CPUFREQ_ENTRY_INVALID; + exynos5250_freq_table[L5].frequency = CPUFREQ_ENTRY_INVALID; + exynos5250_freq_table[L6].frequency = CPUFREQ_ENTRY_INVALID; + + max_support_idx = L7; + + for (i = 0 ; i < CPUFREQ_LEVEL_END ; i++) + exynos5250_volt_table[i] = asv_voltage_5250[i]; +} + +int exynos5250_cpufreq_init(struct exynos_dvfs_info *info) +{ + int i; + unsigned int tmp; + unsigned long rate; + + set_volt_table(); + + cpu_clk = clk_get(NULL, "armclk"); + if (IS_ERR(cpu_clk)) + return PTR_ERR(cpu_clk); + + moutcore = clk_get(NULL, "mout_cpu"); + if (IS_ERR(moutcore)) + goto err_moutcore; + + mout_mpll = clk_get(NULL, "mout_mpll"); + if (IS_ERR(mout_mpll)) + goto err_mout_mpll; + + rate = clk_get_rate(mout_mpll) / 1000; + + mout_apll = clk_get(NULL, "mout_apll"); + if (IS_ERR(mout_apll)) + goto err_mout_apll; + + for (i = L0; i < CPUFREQ_LEVEL_END; i++) { + + exynos5250_clkdiv_table[i].index = i; + + tmp = __raw_readl(EXYNOS5_CLKDIV_CPU0); + + tmp &= ~((0x7 << 0) | (0x7 << 4) | (0x7 << 8) | + (0x7 << 12) | (0x7 << 16) | (0x7 << 20) | + (0x7 << 24) | (0x7 << 28)); + + tmp |= ((clkdiv_cpu0_5250[i][0] << 0) | + (clkdiv_cpu0_5250[i][1] << 4) | + (clkdiv_cpu0_5250[i][2] << 8) | + (clkdiv_cpu0_5250[i][3] << 12) | + (clkdiv_cpu0_5250[i][4] << 16) | + (clkdiv_cpu0_5250[i][5] << 20) | + (clkdiv_cpu0_5250[i][6] << 24) | + (clkdiv_cpu0_5250[i][7] << 28)); + + exynos5250_clkdiv_table[i].clkdiv = tmp; + + tmp = __raw_readl(EXYNOS5_CLKDIV_CPU1); + + tmp &= ~((0x7 << 0) | (0x7 << 4)); + + tmp |= ((clkdiv_cpu1_5250[i][0] << 0) | + (clkdiv_cpu1_5250[i][1] << 4)); + + exynos5250_clkdiv_table[i].clkdiv1 = tmp; + } + + info->mpll_freq_khz = rate; + /* 1000Mhz */ + info->pm_lock_idx = L7; + /* 800Mhz */ + info->pll_safe_idx = L9; + info->max_support_idx = max_support_idx; + info->min_support_idx = min_support_idx; + info->cpu_clk = cpu_clk; + info->volt_table = exynos5250_volt_table; + info->freq_table = exynos5250_freq_table; + info->set_freq = exynos5250_set_frequency; + info->need_apll_change = exynos5250_pms_change; + + return 0; + +err_mout_apll: + clk_put(mout_mpll); +err_mout_mpll: + clk_put(moutcore); +err_moutcore: + clk_put(cpu_clk); + + pr_err("%s: failed initialization\n", __func__); + return -EINVAL; +} +EXPORT_SYMBOL(exynos5250_cpufreq_init); diff --git a/drivers/cpufreq/s3c2416-cpufreq.c b/drivers/cpufreq/s3c2416-cpufreq.c new file mode 100644 index 0000000..50d2f15 --- /dev/null +++ b/drivers/cpufreq/s3c2416-cpufreq.c @@ -0,0 +1,542 @@ +/* + * S3C2416/2450 CPUfreq Support + * + * Copyright 2011 Heiko Stuebner <heiko@sntech.de> + * + * based on s3c64xx_cpufreq.c + * + * Copyright 2009 Wolfson Microelectronics plc + * + * 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 + * published by the Free Software Foundation. + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/init.h> +#include <linux/cpufreq.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/regulator/consumer.h> +#include <linux/reboot.h> +#include <linux/module.h> + +static DEFINE_MUTEX(cpufreq_lock); + +struct s3c2416_data { + struct clk *armdiv; + struct clk *armclk; + struct clk *hclk; + + unsigned long regulator_latency; +#ifdef CONFIG_ARM_S3C2416_CPUFREQ_VCORESCALE + struct regulator *vddarm; +#endif + + struct cpufreq_frequency_table *freq_table; + + bool is_dvs; + bool disable_dvs; +}; + +static struct s3c2416_data s3c2416_cpufreq; + +struct s3c2416_dvfs { + unsigned int vddarm_min; + unsigned int vddarm_max; +}; + +/* pseudo-frequency for dvs mode */ +#define FREQ_DVS 132333 + +/* frequency to sleep and reboot in + * it's essential to leave dvs, as some boards do not reconfigure the + * regulator on reboot + */ +#define FREQ_SLEEP 133333 + +/* Sources for the ARMCLK */ +#define SOURCE_HCLK 0 +#define SOURCE_ARMDIV 1 + +#ifdef CONFIG_ARM_S3C2416_CPUFREQ_VCORESCALE +/* S3C2416 only supports changing the voltage in the dvs-mode. + * Voltages down to 1.0V seem to work, so we take what the regulator + * can get us. + */ +static struct s3c2416_dvfs s3c2416_dvfs_table[] = { + [SOURCE_HCLK] = { 950000, 1250000 }, + [SOURCE_ARMDIV] = { 1250000, 1350000 }, +}; +#endif + +static struct cpufreq_frequency_table s3c2416_freq_table[] = { + { SOURCE_HCLK, FREQ_DVS }, + { SOURCE_ARMDIV, 133333 }, + { SOURCE_ARMDIV, 266666 }, + { SOURCE_ARMDIV, 400000 }, + { 0, CPUFREQ_TABLE_END }, +}; + +static struct cpufreq_frequency_table s3c2450_freq_table[] = { + { SOURCE_HCLK, FREQ_DVS }, + { SOURCE_ARMDIV, 133500 }, + { SOURCE_ARMDIV, 267000 }, + { SOURCE_ARMDIV, 534000 }, + { 0, CPUFREQ_TABLE_END }, +}; + +static int s3c2416_cpufreq_verify_speed(struct cpufreq_policy *policy) +{ + struct s3c2416_data *s3c_freq = &s3c2416_cpufreq; + + if (policy->cpu != 0) + return -EINVAL; + + return cpufreq_frequency_table_verify(policy, s3c_freq->freq_table); +} + +static unsigned int s3c2416_cpufreq_get_speed(unsigned int cpu) +{ + struct s3c2416_data *s3c_freq = &s3c2416_cpufreq; + + if (cpu != 0) + return 0; + + /* return our pseudo-frequency when in dvs mode */ + if (s3c_freq->is_dvs) + return FREQ_DVS; + + return clk_get_rate(s3c_freq->armclk) / 1000; +} + +static int s3c2416_cpufreq_set_armdiv(struct s3c2416_data *s3c_freq, + unsigned int freq) +{ + int ret; + + if (clk_get_rate(s3c_freq->armdiv) / 1000 != freq) { + ret = clk_set_rate(s3c_freq->armdiv, freq * 1000); + if (ret < 0) { + pr_err("cpufreq: Failed to set armdiv rate %dkHz: %d\n", + freq, ret); + return ret; + } + } + + return 0; +} + +static int s3c2416_cpufreq_enter_dvs(struct s3c2416_data *s3c_freq, int idx) +{ +#ifdef CONFIG_ARM_S3C2416_CPUFREQ_VCORESCALE + struct s3c2416_dvfs *dvfs; +#endif + int ret; + + if (s3c_freq->is_dvs) { + pr_debug("cpufreq: already in dvs mode, nothing to do\n"); + return 0; + } + + pr_debug("cpufreq: switching armclk to hclk (%lukHz)\n", + clk_get_rate(s3c_freq->hclk) / 1000); + ret = clk_set_parent(s3c_freq->armclk, s3c_freq->hclk); + if (ret < 0) { + pr_err("cpufreq: Failed to switch armclk to hclk: %d\n", ret); + return ret; + } + +#ifdef CONFIG_ARM_S3C2416_CPUFREQ_VCORESCALE + /* changing the core voltage is only allowed when in dvs mode */ + if (s3c_freq->vddarm) { + dvfs = &s3c2416_dvfs_table[idx]; + + pr_debug("cpufreq: setting regultor to %d-%d\n", + dvfs->vddarm_min, dvfs->vddarm_max); + ret = regulator_set_voltage(s3c_freq->vddarm, + dvfs->vddarm_min, + dvfs->vddarm_max); + + /* when lowering the voltage failed, there is nothing to do */ + if (ret != 0) + pr_err("cpufreq: Failed to set VDDARM: %d\n", ret); + } +#endif + + s3c_freq->is_dvs = 1; + + return 0; +} + +static int s3c2416_cpufreq_leave_dvs(struct s3c2416_data *s3c_freq, int idx) +{ +#ifdef CONFIG_ARM_S3C2416_CPUFREQ_VCORESCALE + struct s3c2416_dvfs *dvfs; +#endif + int ret; + + if (!s3c_freq->is_dvs) { + pr_debug("cpufreq: not in dvs mode, so can't leave\n"); + return 0; + } + +#ifdef CONFIG_ARM_S3C2416_CPUFREQ_VCORESCALE + if (s3c_freq->vddarm) { + dvfs = &s3c2416_dvfs_table[idx]; + + pr_debug("cpufreq: setting regultor to %d-%d\n", + dvfs->vddarm_min, dvfs->vddarm_max); + ret = regulator_set_voltage(s3c_freq->vddarm, + dvfs->vddarm_min, + dvfs->vddarm_max); + if (ret != 0) { + pr_err("cpufreq: Failed to set VDDARM: %d\n", ret); + return ret; + } + } +#endif + + /* force armdiv to hclk frequency for transition from dvs*/ + if (clk_get_rate(s3c_freq->armdiv) > clk_get_rate(s3c_freq->hclk)) { + pr_debug("cpufreq: force armdiv to hclk frequency (%lukHz)\n", + clk_get_rate(s3c_freq->hclk) / 1000); + ret = s3c2416_cpufreq_set_armdiv(s3c_freq, + clk_get_rate(s3c_freq->hclk) / 1000); + if (ret < 0) { + pr_err("cpufreq: Failed to to set the armdiv to %lukHz: %d\n", + clk_get_rate(s3c_freq->hclk) / 1000, ret); + return ret; + } + } + + pr_debug("cpufreq: switching armclk parent to armdiv (%lukHz)\n", + clk_get_rate(s3c_freq->armdiv) / 1000); + + ret = clk_set_parent(s3c_freq->armclk, s3c_freq->armdiv); + if (ret < 0) { + pr_err("cpufreq: Failed to switch armclk clock parent to armdiv: %d\n", + ret); + return ret; + } + + s3c_freq->is_dvs = 0; + + return 0; +} + +static int s3c2416_cpufreq_set_target(struct cpufreq_policy *policy, + unsigned int target_freq, + unsigned int relation) +{ + struct s3c2416_data *s3c_freq = &s3c2416_cpufreq; + struct cpufreq_freqs freqs; + int idx, ret, to_dvs = 0; + unsigned int i; + + mutex_lock(&cpufreq_lock); + + pr_debug("cpufreq: to %dKHz, relation %d\n", target_freq, relation); + + ret = cpufreq_frequency_table_target(policy, s3c_freq->freq_table, + target_freq, relation, &i); + if (ret != 0) + goto out; + + idx = s3c_freq->freq_table[i].index; + + if (idx == SOURCE_HCLK) + to_dvs = 1; + + /* switching to dvs when it's not allowed */ + if (to_dvs && s3c_freq->disable_dvs) { + pr_debug("cpufreq: entering dvs mode not allowed\n"); + ret = -EINVAL; + goto out; + } + + freqs.cpu = 0; + freqs.flags = 0; + freqs.old = s3c_freq->is_dvs ? FREQ_DVS + : clk_get_rate(s3c_freq->armclk) / 1000; + + /* When leavin dvs mode, always switch the armdiv to the hclk rate + * The S3C2416 has stability issues when switching directly to + * higher frequencies. + */ + freqs.new = (s3c_freq->is_dvs && !to_dvs) + ? clk_get_rate(s3c_freq->hclk) / 1000 + : s3c_freq->freq_table[i].frequency; + + pr_debug("cpufreq: Transition %d-%dkHz\n", freqs.old, freqs.new); + + if (!to_dvs && freqs.old == freqs.new) + goto out; + + cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); + + if (to_dvs) { + pr_debug("cpufreq: enter dvs\n"); + ret = s3c2416_cpufreq_enter_dvs(s3c_freq, idx); + } else if (s3c_freq->is_dvs) { + pr_debug("cpufreq: leave dvs\n"); + ret = s3c2416_cpufreq_leave_dvs(s3c_freq, idx); + } else { + pr_debug("cpufreq: change armdiv to %dkHz\n", freqs.new); + ret = s3c2416_cpufreq_set_armdiv(s3c_freq, freqs.new); + } + + cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); + +out: + mutex_unlock(&cpufreq_lock); + + return ret; +} + +#ifdef CONFIG_ARM_S3C2416_CPUFREQ_VCORESCALE +static void __init s3c2416_cpufreq_cfg_regulator(struct s3c2416_data *s3c_freq) +{ + int count, v, i, found; + struct cpufreq_frequency_table *freq; + struct s3c2416_dvfs *dvfs; + + count = regulator_count_voltages(s3c_freq->vddarm); + if (count < 0) { + pr_err("cpufreq: Unable to check supported voltages\n"); + return; + } + + freq = s3c_freq->freq_table; + while (count > 0 && freq->frequency != CPUFREQ_TABLE_END) { + if (freq->frequency == CPUFREQ_ENTRY_INVALID) + continue; + + dvfs = &s3c2416_dvfs_table[freq->index]; + found = 0; + + /* Check only the min-voltage, more is always ok on S3C2416 */ + for (i = 0; i < count; i++) { + v = regulator_list_voltage(s3c_freq->vddarm, i); + if (v >= dvfs->vddarm_min) + found = 1; + } + + if (!found) { + pr_debug("cpufreq: %dkHz unsupported by regulator\n", + freq->frequency); + freq->frequency = CPUFREQ_ENTRY_INVALID; + } + + freq++; + } + + /* Guessed */ + s3c_freq->regulator_latency = 1 * 1000 * 1000; +} +#endif + +static int s3c2416_cpufreq_reboot_notifier_evt(struct notifier_block *this, + unsigned long event, void *ptr) +{ + struct s3c2416_data *s3c_freq = &s3c2416_cpufreq; + int ret; + + mutex_lock(&cpufreq_lock); + + /* disable further changes */ + s3c_freq->disable_dvs = 1; + + mutex_unlock(&cpufreq_lock); + + /* some boards don't reconfigure the regulator on reboot, which + * could lead to undervolting the cpu when the clock is reset. + * Therefore we always leave the DVS mode on reboot. + */ + if (s3c_freq->is_dvs) { + pr_debug("cpufreq: leave dvs on reboot\n"); + ret = cpufreq_driver_target(cpufreq_cpu_get(0), FREQ_SLEEP, 0); + if (ret < 0) + return NOTIFY_BAD; + } + + return NOTIFY_DONE; +} + +static struct notifier_block s3c2416_cpufreq_reboot_notifier = { + .notifier_call = s3c2416_cpufreq_reboot_notifier_evt, +}; + +static int __init s3c2416_cpufreq_driver_init(struct cpufreq_policy *policy) +{ + struct s3c2416_data *s3c_freq = &s3c2416_cpufreq; + struct cpufreq_frequency_table *freq; + struct clk *msysclk; + unsigned long rate; + int ret; + + if (policy->cpu != 0) + return -EINVAL; + + msysclk = clk_get(NULL, "msysclk"); + if (IS_ERR(msysclk)) { + ret = PTR_ERR(msysclk); + pr_err("cpufreq: Unable to obtain msysclk: %d\n", ret); + return ret; + } + + /* + * S3C2416 and S3C2450 share the same processor-ID and also provide no + * other means to distinguish them other than through the rate of + * msysclk. On S3C2416 msysclk runs at 800MHz and on S3C2450 at 533MHz. + */ + rate = clk_get_rate(msysclk); + if (rate == 800 * 1000 * 1000) { + pr_info("cpufreq: msysclk running at %lukHz, using S3C2416 frequency table\n", + rate / 1000); + s3c_freq->freq_table = s3c2416_freq_table; + policy->cpuinfo.max_freq = 400000; + } else if (rate / 1000 == 534000) { + pr_info("cpufreq: msysclk running at %lukHz, using S3C2450 frequency table\n", + rate / 1000); + s3c_freq->freq_table = s3c2450_freq_table; + policy->cpuinfo.max_freq = 534000; + } + + /* not needed anymore */ + clk_put(msysclk); + + if (s3c_freq->freq_table == NULL) { + pr_err("cpufreq: No frequency information for this CPU, msysclk at %lukHz\n", + rate / 1000); + return -ENODEV; + } + + s3c_freq->is_dvs = 0; + + s3c_freq->armdiv = clk_get(NULL, "armdiv"); + if (IS_ERR(s3c_freq->armdiv)) { + ret = PTR_ERR(s3c_freq->armdiv); + pr_err("cpufreq: Unable to obtain ARMDIV: %d\n", ret); + return ret; + } + + s3c_freq->hclk = clk_get(NULL, "hclk"); + if (IS_ERR(s3c_freq->hclk)) { + ret = PTR_ERR(s3c_freq->hclk); + pr_err("cpufreq: Unable to obtain HCLK: %d\n", ret); + goto err_hclk; + } + + /* chech hclk rate, we only support the common 133MHz for now + * hclk could also run at 66MHz, but this not often used + */ + rate = clk_get_rate(s3c_freq->hclk); + if (rate < 133 * 1000 * 1000) { + pr_err("cpufreq: HCLK not at 133MHz\n"); + clk_put(s3c_freq->hclk); + ret = -EINVAL; + goto err_armclk; + } + + s3c_freq->armclk = clk_get(NULL, "armclk"); + if (IS_ERR(s3c_freq->armclk)) { + ret = PTR_ERR(s3c_freq->armclk); + pr_err("cpufreq: Unable to obtain ARMCLK: %d\n", ret); + goto err_armclk; + } + +#ifdef CONFIG_ARM_S3C2416_CPUFREQ_VCORESCALE + s3c_freq->vddarm = regulator_get(NULL, "vddarm"); + if (IS_ERR(s3c_freq->vddarm)) { + ret = PTR_ERR(s3c_freq->vddarm); + pr_err("cpufreq: Failed to obtain VDDARM: %d\n", ret); + goto err_vddarm; + } + + s3c2416_cpufreq_cfg_regulator(s3c_freq); +#else + s3c_freq->regulator_latency = 0; +#endif + + freq = s3c_freq->freq_table; + while (freq->frequency != CPUFREQ_TABLE_END) { + /* special handling for dvs mode */ + if (freq->index == 0) { + if (!s3c_freq->hclk) { + pr_debug("cpufreq: %dkHz unsupported as it would need unavailable dvs mode\n", + freq->frequency); + freq->frequency = CPUFREQ_ENTRY_INVALID; + } else { + freq++; + continue; + } + } + + /* Check for frequencies we can generate */ + rate = clk_round_rate(s3c_freq->armdiv, + freq->frequency * 1000); + rate /= 1000; + if (rate != freq->frequency) { + pr_debug("cpufreq: %dkHz unsupported by clock (clk_round_rate return %lu)\n", + freq->frequency, rate); + freq->frequency = CPUFREQ_ENTRY_INVALID; + } + + freq++; + } + + policy->cur = clk_get_rate(s3c_freq->armclk) / 1000; + + /* Datasheet says PLL stabalisation time must be at least 300us, + * so but add some fudge. (reference in LOCKCON0 register description) + */ + policy->cpuinfo.transition_latency = (500 * 1000) + + s3c_freq->regulator_latency; + + ret = cpufreq_frequency_table_cpuinfo(policy, s3c_freq->freq_table); + if (ret) + goto err_freq_table; + + cpufreq_frequency_table_get_attr(s3c_freq->freq_table, 0); + + register_reboot_notifier(&s3c2416_cpufreq_reboot_notifier); + + return 0; + +err_freq_table: +#ifdef CONFIG_ARM_S3C2416_CPUFREQ_VCORESCALE + regulator_put(s3c_freq->vddarm); +err_vddarm: +#endif + clk_put(s3c_freq->armclk); +err_armclk: + clk_put(s3c_freq->hclk); +err_hclk: + clk_put(s3c_freq->armdiv); + + return ret; +} + +static struct freq_attr *s3c2416_cpufreq_attr[] = { + &cpufreq_freq_attr_scaling_available_freqs, + NULL, +}; + +static struct cpufreq_driver s3c2416_cpufreq_driver = { + .owner = THIS_MODULE, + .flags = 0, + .verify = s3c2416_cpufreq_verify_speed, + .target = s3c2416_cpufreq_set_target, + .get = s3c2416_cpufreq_get_speed, + .init = s3c2416_cpufreq_driver_init, + .name = "s3c2416", + .attr = s3c2416_cpufreq_attr, +}; + +static int __init s3c2416_cpufreq_init(void) +{ + return cpufreq_register_driver(&s3c2416_cpufreq_driver); +} +module_init(s3c2416_cpufreq_init); diff --git a/drivers/cpufreq/s3c64xx-cpufreq.c b/drivers/cpufreq/s3c64xx-cpufreq.c index a5e72cb..6f9490b 100644 --- a/drivers/cpufreq/s3c64xx-cpufreq.c +++ b/drivers/cpufreq/s3c64xx-cpufreq.c @@ -217,13 +217,6 @@ static int s3c64xx_cpufreq_driver_init(struct cpufreq_policy *policy) } else { s3c64xx_cpufreq_config_regulator(); } - - vddint = regulator_get(NULL, "vddint"); - if (IS_ERR(vddint)) { - ret = PTR_ERR(vddint); - pr_err("Failed to obtain VDDINT: %d\n", ret); - vddint = NULL; - } #endif freq = s3c64xx_freq_table; diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h index 6216115..8ff4427 100644 --- a/include/linux/cpufreq.h +++ b/include/linux/cpufreq.h @@ -35,6 +35,7 @@ #ifdef CONFIG_CPU_FREQ int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list); int cpufreq_unregister_notifier(struct notifier_block *nb, unsigned int list); +extern void disable_cpufreq(void); #else /* CONFIG_CPU_FREQ */ static inline int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list) @@ -46,6 +47,7 @@ static inline int cpufreq_unregister_notifier(struct notifier_block *nb, { return 0; } +static inline void disable_cpufreq(void) { } #endif /* CONFIG_CPU_FREQ */ /* if (cpufreq_driver->target) exists, the ->governor decides what frequency |
