diff options
Diffstat (limited to 'arch/arm/mach-exynos4/cpufreq.c')
| -rw-r--r-- | arch/arm/mach-exynos4/cpufreq.c | 569 |
1 files changed, 569 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos4/cpufreq.c b/arch/arm/mach-exynos4/cpufreq.c new file mode 100644 index 000000000000..a1bd258f0c4d --- /dev/null +++ b/arch/arm/mach-exynos4/cpufreq.c @@ -0,0 +1,569 @@ +/* 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); |