[PATCH 3/4] ARM: S5PV310: Add support CPUFREQ
Kukjin Kim
kgene.kim at samsung.com
Fri Sep 17 22:45:15 EDT 2010
From: Sunyoung Kang <sy0816.kang at samsung.com>
This patch adds support CPUFREQ driver for S5PV310 and S5PC210. This can
support DVFS(Dynamic Voltage and Frequency Scaling). The voltage scaling
depends on existence of regulator.
Sigend-off-by: Sunyoung Kang <sy0816.kang at samsung.com>
Signed-off-by: Jaecheol Lee <jc.lee at samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim at samsung.com>
---
arch/arm/mach-s5pv310/cpufreq.c | 561 +++++++++++++++++++++++++++++++++++++++
1 files changed, 561 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-s5pv310/cpufreq.c
diff --git a/arch/arm/mach-s5pv310/cpufreq.c b/arch/arm/mach-s5pv310/cpufreq.c
new file mode 100644
index 0000000..bcd4ebf
--- /dev/null
+++ b/arch/arm/mach-s5pv310/cpufreq.c
@@ -0,0 +1,561 @@
+/* linux/arch/arm/mach-s5pv310/cpufreq.c
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com
+ *
+ * S5PV310 - 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>
+
+static struct clk *cpu_clk;
+static struct clk *moutcore;
+static struct clk *mout_mpll;
+static struct clk *mout_apll;
+
+#ifdef CONFIG_REGULATOR
+static struct regulator *arm_regulator;
+static struct regulator *int_regulator;
+#endif
+
+static struct cpufreq_freqs freqs;
+static unsigned int armclk_use_apll;
+static unsigned int memtype;
+
+enum s5pv310_memory_type {
+ DDR2 = 4,
+ LPDDR2,
+ DDR3,
+};
+
+enum cpufreq_level_index {
+ L0, L1, L2, L3, L4, CPUFREQ_LEVEL_END,
+};
+
+static struct cpufreq_frequency_table s5pv310_freq_table[] = {
+ {L0, 1000*1000},
+ {L1, 800*1000},
+ {L2, 400*1000},
+ {L3, 200*1000},
+ {L4, 100*1000},
+ {0, CPUFREQ_TABLE_END},
+};
+
+static unsigned int clkdiv_cpu0[CPUFREQ_LEVEL_END + 1][7] = {
+ /*
+ * Clock divider value for following
+ * { DIVCORE, DIVCOREM0, DIVCOREM1, DIVPERIPH,
+ * DIVATB, DIVPCLK_DBG, DIVAPLL }
+ */
+
+ /* ARM L0: 1000MHz */
+ { 0, 3, 7, 3, 3, 0, 0 },
+
+ /* ARM L1: 800MHz */
+ { 0, 3, 7, 3, 3, 0, 0 },
+
+ /* ARM L2: 400MHz */
+ { 1, 1, 3, 1, 1, 0, 0 },
+
+ /* ARM L3: 200MHz */
+ { 3, 0, 1, 0, 0, 0, 0 },
+
+ /* ARM L4A: 100MHz, for DDR2/3 */
+ { 7, 0, 1, 0, 0, 0, 0 },
+
+ /* ARM L4B: 100MHz, for LPDDR2 (SMDKV310 has LPDDR2) */
+ { 7, 0, 1, 0, 0, 0, 0 },
+};
+
+static unsigned int clkdiv_dmc0[CPUFREQ_LEVEL_END + 1][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: 400MHz */
+ { 3, 1, 1, 1, 1, 1, 3, 1 },
+
+ /* DMC L3: 400MHz */
+ { 3, 1, 1, 1, 1, 1, 3, 1 },
+
+ /* DMC L4A: 400MHz, for DDR2/3 */
+ { 7, 1, 1, 1, 1, 1, 3, 1 },
+
+ /* DMC L4B: 200MHz, for LPDDR2 */
+ { 7, 1, 1, 3, 1, 1, 3, 1 },
+};
+
+static unsigned int clkdiv_top[CPUFREQ_LEVEL_END + 1][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: 200MHz */
+ { 3, 7, 4, 5, 1 },
+
+ /* ACLK200 L3: 200MHz */
+ { 3, 7, 4, 5, 1 },
+
+ /* ACLK200 L4A: 100MHz */
+ { 7, 7, 7, 7, 1 },
+
+ /* ACLK200 L4B: 100MHz */
+ { 7, 7, 7, 7, 1 },
+};
+
+static unsigned int clkdiv_lr_bus[CPUFREQ_LEVEL_END + 1][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: 200MHz */
+ { 3, 1 },
+
+ /* ACLK_GDL/R L3: 200MHz */
+ { 3, 1 },
+
+ /* ACLK_GDL/R L4A: 100MHz */
+ { 7, 1 },
+
+ /* ACLK_GDL/R L4B: 100MHz */
+ { 7, 1 },
+};
+
+struct cpufreq_voltage_table {
+ unsigned int index; /* any */
+ unsigned int arm_volt; /* uV */
+ unsigned int int_volt;
+};
+
+static struct cpufreq_voltage_table s5pv310_volt_table[] = {
+ {
+ .index = L0,
+ .arm_volt = 1200000,
+ .int_volt = 1100000,
+ }, {
+ .index = L1,
+ .arm_volt = 1100000,
+ .int_volt = 1100000,
+ }, {
+ .index = L2,
+ .arm_volt = 1050000,
+ .int_volt = 1100000,
+ }, {
+ .index = L3,
+ .arm_volt = 1050000,
+ .int_volt = 1100000,
+ }, {
+ .index = L4,
+ .arm_volt = 1000000,
+ .int_volt = 1000000,
+ },
+};
+
+int s5pv310_verify_speed(struct cpufreq_policy *policy)
+{
+ return cpufreq_frequency_table_verify(policy, s5pv310_freq_table);
+}
+
+unsigned int s5pv310_getspeed(unsigned int cpu)
+{
+ return clk_get_rate(cpu_clk) / 1000;
+}
+
+void s5pv310_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 - 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 int s5pv310_target(struct cpufreq_policy *policy,
+ unsigned int target_freq,
+ unsigned int relation)
+{
+ unsigned int index, div_index, tmp;
+ unsigned int arm_volt, int_volt;
+ unsigned int need_apll = 0;
+
+ freqs.old = s5pv310_getspeed(policy->cpu);
+
+ if (cpufreq_frequency_table_target(policy, s5pv310_freq_table,
+ target_freq, relation, &index))
+ return -EINVAL;
+
+ freqs.new = s5pv310_freq_table[index].frequency;
+ freqs.cpu = policy->cpu;
+
+ if (freqs.new == freqs.old)
+ return 0;
+
+ /*
+ * If freqs.new is higher than 800MHz
+ * cpufreq driver should turn on apll
+ */
+ if (index < L1)
+ need_apll = 1;
+
+ /* If the memory type is LPDDR2, use L4-B instead of L4-A */
+ if ((index == L4) && (memtype == LPDDR2))
+ div_index = index + 1;
+ else
+ div_index = index;
+
+ /* get the voltage value */
+ arm_volt = s5pv310_volt_table[index].arm_volt;
+ int_volt = s5pv310_volt_table[index].int_volt;
+
+ cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+
+ /* control regulator */
+ if (freqs.new > freqs.old) {
+ /* Voltage up */
+#ifdef CONFIG_REGULATOR
+ regulator_set_voltage(arm_regulator, arm_volt, arm_volt);
+ regulator_set_voltage(int_regulator, int_volt, int_volt);
+#endif
+ }
+
+ /* Clock Configuration Procedure */
+
+ /* 1. Change the system clock divider values */
+ s5pv310_set_clkdiv(div_index);
+
+ /* 2. Change the divider values for special clocks in CMU_TOP */
+ /* currently nothing */
+
+ /* 3. Change the XPLL values or Select the parent XPLL */
+ if (need_apll) {
+ if (!armclk_use_apll) {
+ /*
+ * If the parent clock of armclk isn't apll
+ * here need to set apll (include m,p,s value)
+ */
+
+ /* a. 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);
+
+ /* b. Set APLL Lock time */
+ __raw_writel(S5P_APLL_LOCKTIME, S5P_APLL_LOCK);
+
+ /* c. Change PLL PMS values */
+ __raw_writel(S5P_APLL_VAL_1000, S5P_APLL_CON0);
+
+ /* d. Turn on a PLL */
+ tmp = __raw_readl(S5P_APLL_CON0);
+ tmp |= (0x1 << S5P_APLLCON0_ENABLE_SHIFT);
+ __raw_writel(tmp, S5P_APLL_CON0);
+
+ /* e. wait_lock_time */
+ do {
+ tmp = __raw_readl(S5P_APLL_CON0);
+ } while (!(tmp & (0x1 << S5P_APLLCON0_LOCKED_SHIFT)));
+
+ armclk_use_apll = 1;
+
+ }
+
+ /* 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));
+
+ } else {
+ if (clk_get_parent(moutcore) != mout_mpll) {
+ clk_set_parent(moutcore, mout_mpll);
+
+ do {
+ tmp = __raw_readl(S5P_CLKMUX_STATCPU);
+ tmp &= S5P_CLKMUX_STATCPU_MUXCORE_MASK;
+ } while (tmp != (0x2 << S5P_CLKSRC_CPU_MUXCORE_SHIFT));
+ }
+ }
+
+ /* control regulator */
+ if (freqs.new < freqs.old) {
+ /* Voltage down */
+#ifdef CONFIG_REGULATOR
+ regulator_set_voltage(arm_regulator, arm_volt, arm_volt);
+ regulator_set_voltage(int_regulator, int_volt, int_volt);
+#endif
+ }
+
+ cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int s5pv310_cpufreq_suspend(struct cpufreq_policy *policy,
+ pm_message_t pmsg)
+{
+ return 0;
+}
+
+static int s5pv310_cpufreq_resume(struct cpufreq_policy *policy)
+{
+ return 0;
+}
+#endif
+
+static int s5pv310_cpufreq_cpu_init(struct cpufreq_policy *policy)
+{
+ policy->cur = policy->min = policy->max = s5pv310_getspeed(policy->cpu);
+
+ cpufreq_frequency_table_get_attr(s5pv310_freq_table, policy->cpu);
+
+ /* set the transition latency value */
+ policy->cpuinfo.transition_latency = 100000;
+
+ /*
+ * S5PV310 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, s5pv310_freq_table);
+}
+
+static struct cpufreq_driver s5pv310_driver = {
+ .flags = CPUFREQ_STICKY,
+ .verify = s5pv310_verify_speed,
+ .target = s5pv310_target,
+ .get = s5pv310_getspeed,
+ .init = s5pv310_cpufreq_cpu_init,
+ .name = "s5pv310_cpufreq",
+#ifdef CONFIG_PM
+ .suspend = s5pv310_cpufreq_suspend,
+ .resume = s5pv310_cpufreq_resume,
+#endif
+};
+
+static int __init s5pv310_cpufreq_init(void)
+{
+ unsigned int tmp;
+
+ 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;
+
+#ifdef CONFIG_REGULATOR
+ 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;
+ }
+#endif
+
+ /* check parent clock of armclk */
+ tmp = __raw_readl(S5P_CLKSRC_CPU);
+ if (tmp & S5P_CLKSRC_CPU_MUXCORE_SHIFT)
+ armclk_use_apll = 0;
+ else
+ armclk_use_apll = 1;
+
+ /*
+ * 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(&s5pv310_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);
+
+#ifdef CONFIG_REGULATOR
+ if (!IS_ERR(arm_regulator))
+ regulator_put(arm_regulator);
+
+ if (!IS_ERR(int_regulator))
+ regulator_put(int_regulator);
+#endif
+
+ printk(KERN_ERR "%s: failed initialization\n", __func__);
+
+ return -EINVAL;
+}
+late_initcall(s5pv310_cpufreq_init);
--
1.6.2.5
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