diff options
Diffstat (limited to 'arch/arm/mach-exynos4/cpufreq.c')
| -rw-r--r-- | arch/arm/mach-exynos4/cpufreq.c | 569 |
1 files changed, 0 insertions, 569 deletions
diff --git a/arch/arm/mach-exynos4/cpufreq.c b/arch/arm/mach-exynos4/cpufreq.c deleted file mode 100644 index a1bd258f0c4d..000000000000 --- a/arch/arm/mach-exynos4/cpufreq.c +++ /dev/null @@ -1,569 +0,0 @@ -/* linux/arch/arm/mach-exynos4/cpufreq.c - * - * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd. - * http://www.samsung.com - * - * EXYNOS4 - 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/types.h> -#include <linux/kernel.h> -#include <linux/err.h> -#include <linux/clk.h> -#include <linux/io.h> -#include <linux/slab.h> -#include <linux/regulator/consumer.h> -#include <linux/cpufreq.h> - -#include <mach/map.h> -#include <mach/regs-clock.h> -#include <mach/regs-mem.h> - -#include <plat/clock.h> -#include <plat/pm.h> - -static struct clk *cpu_clk; -static struct clk *moutcore; -static struct clk *mout_mpll; -static struct clk *mout_apll; - -static struct regulator *arm_regulator; -static struct regulator *int_regulator; - -static struct cpufreq_freqs freqs; -static unsigned int memtype; - -enum exynos4_memory_type { - DDR2 = 4, - LPDDR2, - DDR3, -}; - -enum cpufreq_level_index { - L0, L1, L2, L3, CPUFREQ_LEVEL_END, -}; - -static struct cpufreq_frequency_table exynos4_freq_table[] = { - {L0, 1000*1000}, - {L1, 800*1000}, - {L2, 400*1000}, - {L3, 100*1000}, - {0, CPUFREQ_TABLE_END}, -}; - -static unsigned int clkdiv_cpu0[CPUFREQ_LEVEL_END][7] = { - /* - * Clock divider value for following - * { DIVCORE, DIVCOREM0, DIVCOREM1, DIVPERIPH, - * DIVATB, DIVPCLK_DBG, DIVAPLL } - */ - - /* ARM L0: 1000MHz */ - { 0, 3, 7, 3, 3, 0, 1 }, - - /* ARM L1: 800MHz */ - { 0, 3, 7, 3, 3, 0, 1 }, - - /* ARM L2: 400MHz */ - { 0, 1, 3, 1, 3, 0, 1 }, - - /* ARM L3: 100MHz */ - { 0, 0, 1, 0, 3, 1, 1 }, -}; - -static unsigned int clkdiv_cpu1[CPUFREQ_LEVEL_END][2] = { - /* - * Clock divider value for following - * { DIVCOPY, DIVHPM } - */ - - /* ARM L0: 1000MHz */ - { 3, 0 }, - - /* ARM L1: 800MHz */ - { 3, 0 }, - - /* ARM L2: 400MHz */ - { 3, 0 }, - - /* ARM L3: 100MHz */ - { 3, 0 }, -}; - -static unsigned int clkdiv_dmc0[CPUFREQ_LEVEL_END][8] = { - /* - * Clock divider value for following - * { DIVACP, DIVACP_PCLK, DIVDPHY, DIVDMC, DIVDMCD - * DIVDMCP, DIVCOPY2, DIVCORE_TIMERS } - */ - - /* DMC L0: 400MHz */ - { 3, 1, 1, 1, 1, 1, 3, 1 }, - - /* DMC L1: 400MHz */ - { 3, 1, 1, 1, 1, 1, 3, 1 }, - - /* DMC L2: 266.7MHz */ - { 7, 1, 1, 2, 1, 1, 3, 1 }, - - /* DMC L3: 200MHz */ - { 7, 1, 1, 3, 1, 1, 3, 1 }, -}; - -static unsigned int clkdiv_top[CPUFREQ_LEVEL_END][5] = { - /* - * Clock divider value for following - * { DIVACLK200, DIVACLK100, DIVACLK160, DIVACLK133, DIVONENAND } - */ - - /* ACLK200 L0: 200MHz */ - { 3, 7, 4, 5, 1 }, - - /* ACLK200 L1: 200MHz */ - { 3, 7, 4, 5, 1 }, - - /* ACLK200 L2: 160MHz */ - { 4, 7, 5, 7, 1 }, - - /* ACLK200 L3: 133.3MHz */ - { 5, 7, 7, 7, 1 }, -}; - -static unsigned int clkdiv_lr_bus[CPUFREQ_LEVEL_END][2] = { - /* - * Clock divider value for following - * { DIVGDL/R, DIVGPL/R } - */ - - /* ACLK_GDL/R L0: 200MHz */ - { 3, 1 }, - - /* ACLK_GDL/R L1: 200MHz */ - { 3, 1 }, - - /* ACLK_GDL/R L2: 160MHz */ - { 4, 1 }, - - /* ACLK_GDL/R L3: 133.3MHz */ - { 5, 1 }, -}; - -struct cpufreq_voltage_table { - unsigned int index; /* any */ - unsigned int arm_volt; /* uV */ - unsigned int int_volt; -}; - -static struct cpufreq_voltage_table exynos4_volt_table[CPUFREQ_LEVEL_END] = { - { - .index = L0, - .arm_volt = 1200000, - .int_volt = 1100000, - }, { - .index = L1, - .arm_volt = 1100000, - .int_volt = 1100000, - }, { - .index = L2, - .arm_volt = 1000000, - .int_volt = 1000000, - }, { - .index = L3, - .arm_volt = 900000, - .int_volt = 1000000, - }, -}; - -static unsigned int exynos4_apll_pms_table[CPUFREQ_LEVEL_END] = { - /* APLL FOUT L0: 1000MHz */ - ((250 << 16) | (6 << 8) | 1), - - /* APLL FOUT L1: 800MHz */ - ((200 << 16) | (6 << 8) | 1), - - /* APLL FOUT L2 : 400MHz */ - ((200 << 16) | (6 << 8) | 2), - - /* APLL FOUT L3: 100MHz */ - ((200 << 16) | (6 << 8) | 4), -}; - -int exynos4_verify_speed(struct cpufreq_policy *policy) -{ - return cpufreq_frequency_table_verify(policy, exynos4_freq_table); -} - -unsigned int exynos4_getspeed(unsigned int cpu) -{ - return clk_get_rate(cpu_clk) / 1000; -} - -void exynos4_set_clkdiv(unsigned int div_index) -{ - unsigned int tmp; - - /* Change Divider - CPU0 */ - - tmp = __raw_readl(S5P_CLKDIV_CPU); - - 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[div_index][0] << S5P_CLKDIV_CPU0_CORE_SHIFT) | - (clkdiv_cpu0[div_index][1] << S5P_CLKDIV_CPU0_COREM0_SHIFT) | - (clkdiv_cpu0[div_index][2] << S5P_CLKDIV_CPU0_COREM1_SHIFT) | - (clkdiv_cpu0[div_index][3] << S5P_CLKDIV_CPU0_PERIPH_SHIFT) | - (clkdiv_cpu0[div_index][4] << S5P_CLKDIV_CPU0_ATB_SHIFT) | - (clkdiv_cpu0[div_index][5] << S5P_CLKDIV_CPU0_PCLKDBG_SHIFT) | - (clkdiv_cpu0[div_index][6] << S5P_CLKDIV_CPU0_APLL_SHIFT)); - - __raw_writel(tmp, S5P_CLKDIV_CPU); - - do { - tmp = __raw_readl(S5P_CLKDIV_STATCPU); - } while (tmp & 0x1111111); - - /* Change Divider - CPU1 */ - - tmp = __raw_readl(S5P_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); - - do { - tmp = __raw_readl(S5P_CLKDIV_STATCPU1); - } while (tmp & 0x11); - - /* Change Divider - DMC0 */ - - tmp = __raw_readl(S5P_CLKDIV_DMC0); - - tmp &= ~(S5P_CLKDIV_DMC0_ACP_MASK | S5P_CLKDIV_DMC0_ACPPCLK_MASK | - S5P_CLKDIV_DMC0_DPHY_MASK | S5P_CLKDIV_DMC0_DMC_MASK | - S5P_CLKDIV_DMC0_DMCD_MASK | S5P_CLKDIV_DMC0_DMCP_MASK | - S5P_CLKDIV_DMC0_COPY2_MASK | S5P_CLKDIV_DMC0_CORETI_MASK); - - tmp |= ((clkdiv_dmc0[div_index][0] << S5P_CLKDIV_DMC0_ACP_SHIFT) | - (clkdiv_dmc0[div_index][1] << S5P_CLKDIV_DMC0_ACPPCLK_SHIFT) | - (clkdiv_dmc0[div_index][2] << S5P_CLKDIV_DMC0_DPHY_SHIFT) | - (clkdiv_dmc0[div_index][3] << S5P_CLKDIV_DMC0_DMC_SHIFT) | - (clkdiv_dmc0[div_index][4] << S5P_CLKDIV_DMC0_DMCD_SHIFT) | - (clkdiv_dmc0[div_index][5] << S5P_CLKDIV_DMC0_DMCP_SHIFT) | - (clkdiv_dmc0[div_index][6] << S5P_CLKDIV_DMC0_COPY2_SHIFT) | - (clkdiv_dmc0[div_index][7] << S5P_CLKDIV_DMC0_CORETI_SHIFT)); - - __raw_writel(tmp, S5P_CLKDIV_DMC0); - - do { - tmp = __raw_readl(S5P_CLKDIV_STAT_DMC0); - } while (tmp & 0x11111111); - - /* Change Divider - TOP */ - - tmp = __raw_readl(S5P_CLKDIV_TOP); - - tmp &= ~(S5P_CLKDIV_TOP_ACLK200_MASK | S5P_CLKDIV_TOP_ACLK100_MASK | - S5P_CLKDIV_TOP_ACLK160_MASK | S5P_CLKDIV_TOP_ACLK133_MASK | - S5P_CLKDIV_TOP_ONENAND_MASK); - - tmp |= ((clkdiv_top[div_index][0] << S5P_CLKDIV_TOP_ACLK200_SHIFT) | - (clkdiv_top[div_index][1] << S5P_CLKDIV_TOP_ACLK100_SHIFT) | - (clkdiv_top[div_index][2] << S5P_CLKDIV_TOP_ACLK160_SHIFT) | - (clkdiv_top[div_index][3] << S5P_CLKDIV_TOP_ACLK133_SHIFT) | - (clkdiv_top[div_index][4] << S5P_CLKDIV_TOP_ONENAND_SHIFT)); - - __raw_writel(tmp, S5P_CLKDIV_TOP); - - do { - tmp = __raw_readl(S5P_CLKDIV_STAT_TOP); - } while (tmp & 0x11111); - - /* Change Divider - LEFTBUS */ - - tmp = __raw_readl(S5P_CLKDIV_LEFTBUS); - - tmp &= ~(S5P_CLKDIV_BUS_GDLR_MASK | S5P_CLKDIV_BUS_GPLR_MASK); - - tmp |= ((clkdiv_lr_bus[div_index][0] << S5P_CLKDIV_BUS_GDLR_SHIFT) | - (clkdiv_lr_bus[div_index][1] << S5P_CLKDIV_BUS_GPLR_SHIFT)); - - __raw_writel(tmp, S5P_CLKDIV_LEFTBUS); - - do { - tmp = __raw_readl(S5P_CLKDIV_STAT_LEFTBUS); - } while (tmp & 0x11); - - /* Change Divider - RIGHTBUS */ - - tmp = __raw_readl(S5P_CLKDIV_RIGHTBUS); - - tmp &= ~(S5P_CLKDIV_BUS_GDLR_MASK | S5P_CLKDIV_BUS_GPLR_MASK); - - tmp |= ((clkdiv_lr_bus[div_index][0] << S5P_CLKDIV_BUS_GDLR_SHIFT) | - (clkdiv_lr_bus[div_index][1] << S5P_CLKDIV_BUS_GPLR_SHIFT)); - - __raw_writel(tmp, S5P_CLKDIV_RIGHTBUS); - - do { - tmp = __raw_readl(S5P_CLKDIV_STAT_RIGHTBUS); - } while (tmp & 0x11); -} - -static void exynos4_set_apll(unsigned int index) -{ - unsigned int tmp; - - /* 1. MUX_CORE_SEL = MPLL, ARMCLK uses MPLL for lock time */ - clk_set_parent(moutcore, mout_mpll); - - do { - tmp = (__raw_readl(S5P_CLKMUX_STATCPU) - >> S5P_CLKSRC_CPU_MUXCORE_SHIFT); - tmp &= 0x7; - } while (tmp != 0x2); - - /* 2. Set APLL Lock time */ - __raw_writel(S5P_APLL_LOCKTIME, S5P_APLL_LOCK); - - /* 3. Change PLL PMS values */ - tmp = __raw_readl(S5P_APLL_CON0); - tmp &= ~((0x3ff << 16) | (0x3f << 8) | (0x7 << 0)); - tmp |= exynos4_apll_pms_table[index]; - __raw_writel(tmp, S5P_APLL_CON0); - - /* 4. wait_lock_time */ - do { - tmp = __raw_readl(S5P_APLL_CON0); - } while (!(tmp & (0x1 << S5P_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)); -} - -static void exynos4_set_frequency(unsigned int old_index, unsigned int new_index) -{ - unsigned int tmp; - - if (old_index > new_index) { - /* The frequency changing to L0 needs to change apll */ - if (freqs.new == exynos4_freq_table[L0].frequency) { - /* 1. Change the system clock divider values */ - exynos4_set_clkdiv(new_index); - - /* 2. Change the apll m,p,s value */ - exynos4_set_apll(new_index); - } else { - /* 1. Change the system clock divider values */ - exynos4_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); - __raw_writel(tmp, S5P_APLL_CON0); - } - } - - else if (old_index < new_index) { - /* The frequency changing from L0 needs to change apll */ - if (freqs.old == exynos4_freq_table[L0].frequency) { - /* 1. Change the apll m,p,s value */ - exynos4_set_apll(new_index); - - /* 2. Change the system clock divider values */ - exynos4_set_clkdiv(new_index); - } else { - /* 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); - __raw_writel(tmp, S5P_APLL_CON0); - - /* 2. Change the system clock divider values */ - exynos4_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_volt; - - freqs.old = exynos4_getspeed(policy->cpu); - - if (cpufreq_frequency_table_target(policy, exynos4_freq_table, - freqs.old, relation, &old_index)) - return -EINVAL; - - if (cpufreq_frequency_table_target(policy, exynos4_freq_table, - target_freq, relation, &index)) - return -EINVAL; - - freqs.new = exynos4_freq_table[index].frequency; - freqs.cpu = policy->cpu; - - if (freqs.new == freqs.old) - return 0; - - /* get the voltage value */ - arm_volt = exynos4_volt_table[index].arm_volt; - int_volt = exynos4_volt_table[index].int_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); - regulator_set_voltage(int_regulator, int_volt, int_volt); - } - - /* Clock Configuration Procedure */ - exynos4_set_frequency(old_index, index); - - /* control regulator */ - if (freqs.new < freqs.old) { - /* Voltage down */ - regulator_set_voltage(arm_regulator, arm_volt, arm_volt); - regulator_set_voltage(int_regulator, int_volt, int_volt); - } - - cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); - - return 0; -} - -#ifdef CONFIG_PM -static int exynos4_cpufreq_suspend(struct cpufreq_policy *policy) -{ - return 0; -} - -static int exynos4_cpufreq_resume(struct cpufreq_policy *policy) -{ - return 0; -} -#endif - -static int exynos4_cpufreq_cpu_init(struct cpufreq_policy *policy) -{ - 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. - */ - cpumask_setall(policy->cpus); - - return cpufreq_frequency_table_cpuinfo(policy, exynos4_freq_table); -} - -static struct cpufreq_driver exynos4_driver = { - .flags = CPUFREQ_STICKY, - .verify = exynos4_verify_speed, - .target = exynos4_target, - .get = exynos4_getspeed, - .init = exynos4_cpufreq_cpu_init, - .name = "exynos4_cpufreq", -#ifdef CONFIG_PM - .suspend = exynos4_cpufreq_suspend, - .resume = exynos4_cpufreq_resume, -#endif -}; - -static int __init exynos4_cpufreq_init(void) -{ - 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 out; - - mout_mpll = clk_get(NULL, "mout_mpll"); - if (IS_ERR(mout_mpll)) - goto out; - - 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; - } - - int_regulator = regulator_get(NULL, "vdd_int"); - if (IS_ERR(int_regulator)) { - printk(KERN_ERR "failed to get resource %s\n", "vdd_int"); - goto out; - } - - /* - * Check DRAM type. - * Because DVFS level is different according to DRAM type. - */ - memtype = __raw_readl(S5P_VA_DMC0 + S5P_DMC0_MEMCON_OFFSET); - memtype = (memtype >> S5P_DMC0_MEMTYPE_SHIFT); - memtype &= S5P_DMC0_MEMTYPE_MASK; - - if ((memtype < DDR2) && (memtype > DDR3)) { - printk(KERN_ERR "%s: wrong memtype= 0x%x\n", __func__, memtype); - goto out; - } else { - printk(KERN_DEBUG "%s: memtype= 0x%x\n", __func__, memtype); - } - - return cpufreq_register_driver(&exynos4_driver); - -out: - if (!IS_ERR(cpu_clk)) - clk_put(cpu_clk); - - if (!IS_ERR(moutcore)) - clk_put(moutcore); - - if (!IS_ERR(mout_mpll)) - clk_put(mout_mpll); - - if (!IS_ERR(mout_apll)) - clk_put(mout_apll); - - if (!IS_ERR(arm_regulator)) - regulator_put(arm_regulator); - - if (!IS_ERR(int_regulator)) - regulator_put(int_regulator); - - printk(KERN_ERR "%s: failed initialization\n", __func__); - - return -EINVAL; -} -late_initcall(exynos4_cpufreq_init); |