Merge branch 'dev/s5pv310-cpufreq' into next-s5pv310

8 files changed, 711 insertions, 9 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index d56d21c0573b..5ecaec63a47b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -738,6 +738,7 @@ config ARCH_S5PV310
 	select ARCH_SPARSEMEM_ENABLE
 	select GENERIC_GPIO
 	select HAVE_CLK
+	select ARCH_HAS_CPUFREQ
 	select GENERIC_CLOCKEVENTS
 	select HAVE_S3C_RTC if RTC_CLASS
 	select HAVE_S3C2410_I2C if I2C
diff --git a/arch/arm/mach-s5pv310/Makefile b/arch/arm/mach-s5pv310/Makefile
index e310609d6268..ef9650827136 100644
--- a/arch/arm/mach-s5pv310/Makefile
+++ b/arch/arm/mach-s5pv310/Makefile
@@ -14,6 +14,7 @@ obj-				:=
 
 obj-$(CONFIG_CPU_S5PV310)	+= cpu.o init.o clock.o irq-combiner.o
 obj-$(CONFIG_CPU_S5PV310)	+= setup-i2c0.o time.o gpiolib.o irq-eint.o
+obj-$(CONFIG_CPU_FREQ)		+= cpufreq.o
 
 obj-$(CONFIG_SMP)		+= platsmp.o headsmp.o
 obj-$(CONFIG_LOCAL_TIMERS)	+= localtimer.o
diff --git a/arch/arm/mach-s5pv310/clock.c b/arch/arm/mach-s5pv310/clock.c
index 58c9d33f36fe..752a07ed7c19 100644
--- a/arch/arm/mach-s5pv310/clock.c
+++ b/arch/arm/mach-s5pv310/clock.c
@@ -244,7 +244,7 @@ static struct clksrc_clk clk_mout_corebus = {
 		.id		= -1,
 	},
 	.sources	= &clkset_mout_corebus,
-	.reg_src	= { .reg = S5P_CLKSRC_CORE, .shift = 4, .size = 1 },
+	.reg_src	= { .reg = S5P_CLKSRC_DMC, .shift = 4, .size = 1 },
 };
 
 static struct clksrc_clk clk_sclk_dmc = {
@@ -253,7 +253,7 @@ static struct clksrc_clk clk_sclk_dmc = {
 		.id		= -1,
 		.parent		= &clk_mout_corebus.clk,
 	},
-	.reg_div	= { .reg = S5P_CLKDIV_CORE0, .shift = 12, .size = 3 },
+	.reg_div	= { .reg = S5P_CLKDIV_DMC0, .shift = 12, .size = 3 },
 };
 
 static struct clksrc_clk clk_aclk_cored = {
@@ -262,7 +262,7 @@ static struct clksrc_clk clk_aclk_cored = {
 		.id		= -1,
 		.parent		= &clk_sclk_dmc.clk,
 	},
-	.reg_div	= { .reg = S5P_CLKDIV_CORE0, .shift = 16, .size = 3 },
+	.reg_div	= { .reg = S5P_CLKDIV_DMC0, .shift = 16, .size = 3 },
 };
 
 static struct clksrc_clk clk_aclk_corep = {
@@ -271,7 +271,7 @@ static struct clksrc_clk clk_aclk_corep = {
 		.id		= -1,
 		.parent		= &clk_aclk_cored.clk,
 	},
-	.reg_div	= { .reg = S5P_CLKDIV_CORE0, .shift = 20, .size = 3 },
+	.reg_div	= { .reg = S5P_CLKDIV_DMC0, .shift = 20, .size = 3 },
 };
 
 static struct clksrc_clk clk_aclk_acp = {
@@ -280,7 +280,7 @@ static struct clksrc_clk clk_aclk_acp = {
 		.id		= -1,
 		.parent		= &clk_mout_corebus.clk,
 	},
-	.reg_div	= { .reg = S5P_CLKDIV_CORE0, .shift = 0, .size = 3 },
+	.reg_div	= { .reg = S5P_CLKDIV_DMC0, .shift = 0, .size = 3 },
 };
 
 static struct clksrc_clk clk_pclk_acp = {
@@ -289,7 +289,7 @@ static struct clksrc_clk clk_pclk_acp = {
 		.id		= -1,
 		.parent		= &clk_aclk_acp.clk,
 	},
-	.reg_div	= { .reg = S5P_CLKDIV_CORE0, .shift = 4, .size = 3 },
+	.reg_div	= { .reg = S5P_CLKDIV_DMC0, .shift = 4, .size = 3 },
 };
 
 /* Core list of CMU_TOP side */
@@ -990,6 +990,17 @@ static struct clksrc_clk *sysclks[] = {
 	&clk_dout_mmc4,
 };
 
+static int xtal_rate;
+
+static unsigned long s5pv310_fout_apll_get_rate(struct clk *clk)
+{
+	return s5p_get_pll45xx(xtal_rate, __raw_readl(S5P_APLL_CON0), pll_4508);
+}
+
+static struct clk_ops s5pv310_fout_apll_ops = {
+	.get_rate = s5pv310_fout_apll_get_rate,
+};
+
 void __init_or_cpufreq s5pv310_setup_clocks(void)
 {
 	struct clk *xtal_clk;
@@ -1013,6 +1024,9 @@ void __init_or_cpufreq s5pv310_setup_clocks(void)
 	BUG_ON(IS_ERR(xtal_clk));
 
 	xtal = clk_get_rate(xtal_clk);
+
+	xtal_rate = xtal;
+
 	clk_put(xtal_clk);
 
 	printk(KERN_DEBUG "%s: xtal is %ld\n", __func__, xtal);
@@ -1026,7 +1040,7 @@ void __init_or_cpufreq s5pv310_setup_clocks(void)
 	vpll = s5p_get_pll46xx(vpllsrc, __raw_readl(S5P_VPLL_CON0),
 				__raw_readl(S5P_VPLL_CON1), pll_4650);
 
-	clk_fout_apll.rate = apll;
+	clk_fout_apll.ops = &s5pv310_fout_apll_ops;
 	clk_fout_mpll.rate = mpll;
 	clk_fout_epll.rate = epll;
 	clk_fout_vpll.rate = vpll;
diff --git a/arch/arm/mach-s5pv310/cpu.c b/arch/arm/mach-s5pv310/cpu.c
index 9900464082db..72092db104c5 100644
--- a/arch/arm/mach-s5pv310/cpu.c
+++ b/arch/arm/mach-s5pv310/cpu.c
@@ -78,6 +78,11 @@ static struct map_desc s5pv310_iodesc[] __initdata = {
 		.length		= SZ_256,
 		.type		= MT_DEVICE,
 	}, {
+		.virtual	= (unsigned long)S5P_VA_DMC0,
+		.pfn		= __phys_to_pfn(S5PV310_PA_DMC0),
+		.length		= SZ_4K,
+		.type		= MT_DEVICE,
+	}, {
 		.virtual	= (unsigned long)S3C_VA_UART,
 		.pfn		= __phys_to_pfn(S3C_PA_UART),
 		.length		= SZ_512K,
diff --git a/arch/arm/mach-s5pv310/cpufreq.c b/arch/arm/mach-s5pv310/cpufreq.c
new file mode 100644
index 000000000000..b04cbc731128
--- /dev/null
+++ b/arch/arm/mach-s5pv310/cpufreq.c
@@ -0,0 +1,580 @@
+/* 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>
+#include <plat/pm.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 memtype;
+
+enum s5pv310_memory_type {
+	DDR2 = 4,
+	LPDDR2,
+	DDR3,
+};
+
+enum cpufreq_level_index {
+	L0, L1, L2, L3, CPUFREQ_LEVEL_END,
+};
+
+static struct cpufreq_frequency_table s5pv310_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 s5pv310_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 s5pv310_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 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 - 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 s5pv310_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 |= s5pv310_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 s5pv310_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 == s5pv310_freq_table[L0].frequency) {
+			/* 1. Change the system clock divider values */
+			s5pv310_set_clkdiv(new_index);
+
+			/* 2. Change the apll m,p,s value */
+			s5pv310_set_apll(new_index);
+		} else {
+			/* 1. Change the system clock divider values */
+			s5pv310_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 |= (s5pv310_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 == s5pv310_freq_table[L0].frequency) {
+			/* 1. Change the apll m,p,s value */
+			s5pv310_set_apll(new_index);
+
+			/* 2. Change the system clock divider values */
+			s5pv310_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 |= (s5pv310_apll_pms_table[new_index] & 0x7);
+			__raw_writel(tmp, S5P_APLL_CON0);
+
+			/* 2. Change the system clock divider values */
+			s5pv310_set_clkdiv(new_index);
+		}
+	}
+}
+
+static int s5pv310_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 = s5pv310_getspeed(policy->cpu);
+
+	if (cpufreq_frequency_table_target(policy, s5pv310_freq_table,
+					   freqs.old, relation, &old_index))
+		return -EINVAL;
+
+	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;
+
+	/* 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 */
+	s5pv310_set_frequency(old_index, index);
+
+	/* 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)
+{
+	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 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);
diff --git a/arch/arm/mach-s5pv310/include/mach/map.h b/arch/arm/mach-s5pv310/include/mach/map.h
index a16d0c9c27bc..7be1a43a2196 100644
--- a/arch/arm/mach-s5pv310/include/mach/map.h
+++ b/arch/arm/mach-s5pv310/include/mach/map.h
@@ -46,6 +46,8 @@
 #define S5PV310_PA_WATCHDOG		(0x10060000)
 #define S5PV310_PA_RTC			(0x10070000)
 
+#define S5PV310_PA_DMC0			(0x10400000)
+
 #define S5PV310_PA_COMBINER		(0x10448000)
 
 #define S5PV310_PA_COREPERI		(0x10500000)
diff --git a/arch/arm/mach-s5pv310/include/mach/regs-clock.h b/arch/arm/mach-s5pv310/include/mach/regs-clock.h
index f1028cad9788..b5c4ada1cff5 100644
--- a/arch/arm/mach-s5pv310/include/mach/regs-clock.h
+++ b/arch/arm/mach-s5pv310/include/mach/regs-clock.h
@@ -19,6 +19,12 @@
 
 #define S5P_INFORM0			S5P_CLKREG(0x800)
 
+#define S5P_CLKDIV_LEFTBUS		S5P_CLKREG(0x04500)
+#define S5P_CLKDIV_STAT_LEFTBUS		S5P_CLKREG(0x04600)
+
+#define S5P_CLKDIV_RIGHTBUS		S5P_CLKREG(0x08500)
+#define S5P_CLKDIV_STAT_RIGHTBUS	S5P_CLKREG(0x08600)
+
 #define S5P_EPLL_CON0			S5P_CLKREG(0x0C110)
 #define S5P_EPLL_CON1			S5P_CLKREG(0x0C114)
 #define S5P_VPLL_CON0			S5P_CLKREG(0x0C120)
@@ -58,6 +64,8 @@
 #define S5P_CLKSRC_MASK_PERIL0		S5P_CLKREG(0x0C350)
 #define S5P_CLKSRC_MASK_PERIL1		S5P_CLKREG(0x0C354)
 
+#define S5P_CLKDIV_STAT_TOP		S5P_CLKREG(0x0C610)
+
 #define S5P_CLKGATE_IP_CAM		S5P_CLKREG(0x0C920)
 #define S5P_CLKGATE_IP_IMAGE		S5P_CLKREG(0x0C930)
 #define S5P_CLKGATE_IP_LCD0		S5P_CLKREG(0x0C934)
@@ -66,8 +74,9 @@
 #define S5P_CLKGATE_IP_PERIL		S5P_CLKREG(0x0C950)
 #define S5P_CLKGATE_IP_PERIR		S5P_CLKREG(0x0C960)
 
-#define S5P_CLKSRC_CORE			S5P_CLKREG(0x10200)
-#define S5P_CLKDIV_CORE0		S5P_CLKREG(0x10500)
+#define S5P_CLKSRC_DMC			S5P_CLKREG(0x10200)
+#define S5P_CLKDIV_DMC0			S5P_CLKREG(0x10500)
+#define S5P_CLKDIV_STAT_DMC0		S5P_CLKREG(0x10600)
 
 #define S5P_APLL_LOCK			S5P_CLKREG(0x14000)
 #define S5P_MPLL_LOCK			S5P_CLKREG(0x14004)
@@ -80,10 +89,77 @@
 #define S5P_CLKMUX_STATCPU		S5P_CLKREG(0x14400)
 
 #define S5P_CLKDIV_CPU			S5P_CLKREG(0x14500)
+#define S5P_CLKDIV_CPU1			S5P_CLKREG(0x14504)
 #define S5P_CLKDIV_STATCPU		S5P_CLKREG(0x14600)
+#define S5P_CLKDIV_STATCPU1		S5P_CLKREG(0x14604)
 
 #define S5P_CLKGATE_SCLKCPU		S5P_CLKREG(0x14800)
 
+/* APLL_LOCK */
+#define S5P_APLL_LOCKTIME		(0x1C20)	/* 300us */
+
+/* APLL_CON0 */
+#define S5P_APLLCON0_ENABLE_SHIFT	(31)
+#define S5P_APLLCON0_LOCKED_SHIFT	(29)
+#define S5P_APLL_VAL_1000		((250 << 16) | (6 << 8) | 1)
+#define S5P_APLL_VAL_800		((200 << 16) | (6 << 8) | 1)
+
+/* CLK_SRC_CPU */
+#define S5P_CLKSRC_CPU_MUXCORE_SHIFT	(16)
+#define S5P_CLKMUX_STATCPU_MUXCORE_MASK	(0x7 << S5P_CLKSRC_CPU_MUXCORE_SHIFT)
+
+/* CLKDIV_CPU0 */
+#define S5P_CLKDIV_CPU0_CORE_SHIFT	(0)
+#define S5P_CLKDIV_CPU0_CORE_MASK	(0x7 << S5P_CLKDIV_CPU0_CORE_SHIFT)
+#define S5P_CLKDIV_CPU0_COREM0_SHIFT	(4)
+#define S5P_CLKDIV_CPU0_COREM0_MASK	(0x7 << S5P_CLKDIV_CPU0_COREM0_SHIFT)
+#define S5P_CLKDIV_CPU0_COREM1_SHIFT	(8)
+#define S5P_CLKDIV_CPU0_COREM1_MASK	(0x7 << S5P_CLKDIV_CPU0_COREM1_SHIFT)
+#define S5P_CLKDIV_CPU0_PERIPH_SHIFT	(12)
+#define S5P_CLKDIV_CPU0_PERIPH_MASK	(0x7 << S5P_CLKDIV_CPU0_PERIPH_SHIFT)
+#define S5P_CLKDIV_CPU0_ATB_SHIFT	(16)
+#define S5P_CLKDIV_CPU0_ATB_MASK	(0x7 << S5P_CLKDIV_CPU0_ATB_SHIFT)
+#define S5P_CLKDIV_CPU0_PCLKDBG_SHIFT	(20)
+#define S5P_CLKDIV_CPU0_PCLKDBG_MASK	(0x7 << S5P_CLKDIV_CPU0_PCLKDBG_SHIFT)
+#define S5P_CLKDIV_CPU0_APLL_SHIFT	(24)
+#define S5P_CLKDIV_CPU0_APLL_MASK	(0x7 << S5P_CLKDIV_CPU0_APLL_SHIFT)
+
+/* CLKDIV_DMC0 */
+#define S5P_CLKDIV_DMC0_ACP_SHIFT	(0)
+#define S5P_CLKDIV_DMC0_ACP_MASK	(0x7 << S5P_CLKDIV_DMC0_ACP_SHIFT)
+#define S5P_CLKDIV_DMC0_ACPPCLK_SHIFT	(4)
+#define S5P_CLKDIV_DMC0_ACPPCLK_MASK	(0x7 << S5P_CLKDIV_DMC0_ACPPCLK_SHIFT)
+#define S5P_CLKDIV_DMC0_DPHY_SHIFT	(8)
+#define S5P_CLKDIV_DMC0_DPHY_MASK	(0x7 << S5P_CLKDIV_DMC0_DPHY_SHIFT)
+#define S5P_CLKDIV_DMC0_DMC_SHIFT	(12)
+#define S5P_CLKDIV_DMC0_DMC_MASK	(0x7 << S5P_CLKDIV_DMC0_DMC_SHIFT)
+#define S5P_CLKDIV_DMC0_DMCD_SHIFT	(16)
+#define S5P_CLKDIV_DMC0_DMCD_MASK	(0x7 << S5P_CLKDIV_DMC0_DMCD_SHIFT)
+#define S5P_CLKDIV_DMC0_DMCP_SHIFT	(20)
+#define S5P_CLKDIV_DMC0_DMCP_MASK	(0x7 << S5P_CLKDIV_DMC0_DMCP_SHIFT)
+#define S5P_CLKDIV_DMC0_COPY2_SHIFT	(24)
+#define S5P_CLKDIV_DMC0_COPY2_MASK	(0x7 << S5P_CLKDIV_DMC0_COPY2_SHIFT)
+#define S5P_CLKDIV_DMC0_CORETI_SHIFT	(28)
+#define S5P_CLKDIV_DMC0_CORETI_MASK	(0x7 << S5P_CLKDIV_DMC0_CORETI_SHIFT)
+
+/* CLKDIV_TOP */
+#define S5P_CLKDIV_TOP_ACLK200_SHIFT	(0)
+#define S5P_CLKDIV_TOP_ACLK200_MASK	(0x7 << S5P_CLKDIV_TOP_ACLK200_SHIFT)
+#define S5P_CLKDIV_TOP_ACLK100_SHIFT	(4)
+#define S5P_CLKDIV_TOP_ACLK100_MASK	(0xf << S5P_CLKDIV_TOP_ACLK100_SHIFT)
+#define S5P_CLKDIV_TOP_ACLK160_SHIFT	(8)
+#define S5P_CLKDIV_TOP_ACLK160_MASK	(0x7 << S5P_CLKDIV_TOP_ACLK160_SHIFT)
+#define S5P_CLKDIV_TOP_ACLK133_SHIFT	(12)
+#define S5P_CLKDIV_TOP_ACLK133_MASK	(0x7 << S5P_CLKDIV_TOP_ACLK133_SHIFT)
+#define S5P_CLKDIV_TOP_ONENAND_SHIFT	(16)
+#define S5P_CLKDIV_TOP_ONENAND_MASK	(0x7 << S5P_CLKDIV_TOP_ONENAND_SHIFT)
+
+/* CLKDIV_LEFTBUS / CLKDIV_RIGHTBUS*/
+#define S5P_CLKDIV_BUS_GDLR_SHIFT	(0)
+#define S5P_CLKDIV_BUS_GDLR_MASK	(0x7 << S5P_CLKDIV_BUS_GDLR_SHIFT)
+#define S5P_CLKDIV_BUS_GPLR_SHIFT	(4)
+#define S5P_CLKDIV_BUS_GPLR_MASK	(0x7 << S5P_CLKDIV_BUS_GPLR_SHIFT)
+
 /* Compatibility defines */
 
 #define S5P_EPLL_CON			S5P_EPLL_CON0
diff --git a/arch/arm/mach-s5pv310/include/mach/regs-mem.h b/arch/arm/mach-s5pv310/include/mach/regs-mem.h
new file mode 100644
index 000000000000..834227140eaa
--- /dev/null
+++ b/arch/arm/mach-s5pv310/include/mach/regs-mem.h
@@ -0,0 +1,23 @@
+/* linux/arch/arm/mach-s5pv310/include/mach/regs-mem.h
+ *
+ * Copyright (c) 2010 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com
+ *
+ * S5PV310 - SROMC and DMC register definitions
+ *
+ * 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.
+*/
+
+#ifndef __ASM_ARCH_REGS_MEM_H
+#define __ASM_ARCH_REGS_MEM_H __FILE__
+
+#include <mach/map.h>
+
+#define S5P_DMC0_MEMCON_OFFSET		0x04
+
+#define S5P_DMC0_MEMTYPE_SHIFT		8
+#define S5P_DMC0_MEMTYPE_MASK		0xF
+
+#endif /* __ASM_ARCH_REGS_MEM_H */