ARM: S5P6440: Move CPU specific code in plat-s5p to machine directory

The s5p6440-clock.c and s5p6440-init.c code in the plat-s5p is specific to
s5p6440 SoC based systems. So these files are being moved to the machine
directory of s5p6440. And these files are renamed in the machine directory.

Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

5 files changed, 752 insertions, 4 deletions

diff --git a/arch/arm/mach-s5p6440/Kconfig b/arch/arm/mach-s5p6440/Kconfig
index 3aa2462..4c29ff8 100644
--- a/arch/arm/mach-s5p6440/Kconfig
+++ b/arch/arm/mach-s5p6440/Kconfig
@@ -9,8 +9,6 @@ if ARCH_S5P6440
 
 config CPU_S5P6440
 	bool
-	select CPU_S5P6440_INIT
-	select CPU_S5P6440_CLOCK
 	help
 	  Enable S5P6440 CPU support
 
diff --git a/arch/arm/mach-s5p6440/Makefile b/arch/arm/mach-s5p6440/Makefile
index a79b130..1ad894b 100644
--- a/arch/arm/mach-s5p6440/Makefile
+++ b/arch/arm/mach-s5p6440/Makefile
@@ -12,7 +12,7 @@ obj-				:=
 
 # Core support for S5P6440 system
 
-obj-$(CONFIG_CPU_S5P6440)	+= cpu.o s5p6440-gpio.o
+obj-$(CONFIG_CPU_S5P6440)	+= cpu.o init.o clock.o gpio.o
 
 # machine support
 
diff --git a/arch/arm/mach-s5p6440/clock.c b/arch/arm/mach-s5p6440/clock.c
new file mode 100644
index 0000000..b2672e1
--- /dev/null
+++ b/arch/arm/mach-s5p6440/clock.c
@@ -0,0 +1,698 @@
+/* linux/arch/arm/mach-s5p6440/clock.c
+ *
+ * Copyright (c) 2009 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com/
+ *
+ * S5P6440 - Clock 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/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/sysdev.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <mach/map.h>
+
+#include <plat/cpu-freq.h>
+#include <mach/regs-clock.h>
+#include <plat/clock.h>
+#include <plat/cpu.h>
+#include <plat/clock-clksrc.h>
+#include <plat/s5p-clock.h>
+#include <plat/pll.h>
+#include <plat/s5p6440.h>
+
+/* APLL Mux output clock */
+static struct clksrc_clk clk_mout_apll = {
+	.clk    = {
+		.name           = "mout_apll",
+		.id             = -1,
+	},
+	.sources        = &clk_src_apll,
+	.reg_src        = { .reg = S5P_CLK_SRC0, .shift = 0, .size = 1 },
+};
+
+static int s5p6440_epll_enable(struct clk *clk, int enable)
+{
+	unsigned int ctrlbit = clk->ctrlbit;
+	unsigned int epll_con = __raw_readl(S5P_EPLL_CON) & ~ctrlbit;
+
+	if (enable)
+		__raw_writel(epll_con | ctrlbit, S5P_EPLL_CON);
+	else
+		__raw_writel(epll_con, S5P_EPLL_CON);
+
+	return 0;
+}
+
+static unsigned long s5p6440_epll_get_rate(struct clk *clk)
+{
+	return clk->rate;
+}
+
+static u32 epll_div[][5] = {
+	{ 36000000,	0,	48, 1, 4 },
+	{ 48000000,	0,	32, 1, 3 },
+	{ 60000000,	0,	40, 1, 3 },
+	{ 72000000,	0,	48, 1, 3 },
+	{ 84000000,	0,	28, 1, 2 },
+	{ 96000000,	0,	32, 1, 2 },
+	{ 32768000,	45264,	43, 1, 4 },
+	{ 45158000,	6903,	30, 1, 3 },
+	{ 49152000,	50332,	32, 1, 3 },
+	{ 67738000,	10398,	45, 1, 3 },
+	{ 73728000,	9961,	49, 1, 3 }
+};
+
+static int s5p6440_epll_set_rate(struct clk *clk, unsigned long rate)
+{
+	unsigned int epll_con, epll_con_k;
+	unsigned int i;
+
+	if (clk->rate == rate)	/* Return if nothing changed */
+		return 0;
+
+	epll_con = __raw_readl(S5P_EPLL_CON);
+	epll_con_k = __raw_readl(S5P_EPLL_CON_K);
+
+	epll_con_k &= ~(PLL90XX_KDIV_MASK);
+	epll_con &= ~(PLL90XX_MDIV_MASK | PLL90XX_PDIV_MASK | PLL90XX_SDIV_MASK);
+
+	for (i = 0; i < ARRAY_SIZE(epll_div); i++) {
+		 if (epll_div[i][0] == rate) {
+			epll_con_k |= (epll_div[i][1] << PLL90XX_KDIV_SHIFT);
+			epll_con |= (epll_div[i][2] << PLL90XX_MDIV_SHIFT) |
+				    (epll_div[i][3] << PLL90XX_PDIV_SHIFT) |
+				    (epll_div[i][4] << PLL90XX_SDIV_SHIFT);
+			break;
+		}
+	}
+
+	if (i == ARRAY_SIZE(epll_div)) {
+		printk(KERN_ERR "%s: Invalid Clock EPLL Frequency\n", __func__);
+		return -EINVAL;
+	}
+
+	__raw_writel(epll_con, S5P_EPLL_CON);
+	__raw_writel(epll_con_k, S5P_EPLL_CON_K);
+
+	clk->rate = rate;
+
+	return 0;
+}
+
+static struct clk_ops s5p6440_epll_ops = {
+	.get_rate = s5p6440_epll_get_rate,
+	.set_rate = s5p6440_epll_set_rate,
+};
+
+static struct clksrc_clk clk_mout_epll = {
+	.clk    = {
+		.name           = "mout_epll",
+		.id             = -1,
+	},
+	.sources        = &clk_src_epll,
+	.reg_src        = { .reg = S5P_CLK_SRC0, .shift = 2, .size = 1 },
+};
+
+static struct clksrc_clk clk_mout_mpll = {
+	.clk = {
+		.name           = "mout_mpll",
+		.id             = -1,
+	},
+	.sources        = &clk_src_mpll,
+	.reg_src        = { .reg = S5P_CLK_SRC0, .shift = 1, .size = 1 },
+};
+
+static struct clk clk_h_low = {
+	.name		= "hclk_low",
+	.id		= -1,
+	.rate		= 0,
+	.parent		= NULL,
+	.ctrlbit	= 0,
+	.ops		= &clk_ops_def_setrate,
+};
+
+static struct clk clk_p_low = {
+	.name		= "pclk_low",
+	.id		= -1,
+	.rate		= 0,
+	.parent		= NULL,
+	.ctrlbit	= 0,
+	.ops		= &clk_ops_def_setrate,
+};
+
+enum perf_level {
+	L0 = 532*1000,
+	L1 = 266*1000,
+	L2 = 133*1000,
+};
+
+static const u32 clock_table[][3] = {
+	/*{ARM_CLK, DIVarm, DIVhclk}*/
+	{L0 * 1000, (0 << ARM_DIV_RATIO_SHIFT), (3 << S5P_CLKDIV0_HCLK_SHIFT)},
+	{L1 * 1000, (1 << ARM_DIV_RATIO_SHIFT), (1 << S5P_CLKDIV0_HCLK_SHIFT)},
+	{L2 * 1000, (3 << ARM_DIV_RATIO_SHIFT), (0 << S5P_CLKDIV0_HCLK_SHIFT)},
+};
+
+static unsigned long s5p6440_armclk_get_rate(struct clk *clk)
+{
+	unsigned long rate = clk_get_rate(clk->parent);
+	u32 clkdiv;
+
+	/* divisor mask starts at bit0, so no need to shift */
+	clkdiv = __raw_readl(ARM_CLK_DIV) & ARM_DIV_MASK;
+
+	return rate / (clkdiv + 1);
+}
+
+static unsigned long s5p6440_armclk_round_rate(struct clk *clk,
+						unsigned long rate)
+{
+	u32 iter;
+
+	for (iter = 1 ; iter < ARRAY_SIZE(clock_table) ; iter++) {
+		if (rate > clock_table[iter][0])
+			return clock_table[iter-1][0];
+	}
+
+	return clock_table[ARRAY_SIZE(clock_table) - 1][0];
+}
+
+static int s5p6440_armclk_set_rate(struct clk *clk, unsigned long rate)
+{
+	u32 round_tmp;
+	u32 iter;
+	u32 clk_div0_tmp;
+	u32 cur_rate = clk->ops->get_rate(clk);
+	unsigned long flags;
+
+	round_tmp = clk->ops->round_rate(clk, rate);
+	if (round_tmp == cur_rate)
+		return 0;
+
+
+	for (iter = 0 ; iter < ARRAY_SIZE(clock_table) ; iter++) {
+		if (round_tmp == clock_table[iter][0])
+			break;
+	}
+
+	if (iter >= ARRAY_SIZE(clock_table))
+		iter = ARRAY_SIZE(clock_table) - 1;
+
+	local_irq_save(flags);
+	if (cur_rate > round_tmp) {
+		/* Frequency Down */
+		clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK);
+		clk_div0_tmp |= clock_table[iter][1];
+		__raw_writel(clk_div0_tmp, ARM_CLK_DIV);
+
+		clk_div0_tmp = __raw_readl(ARM_CLK_DIV) &
+				~(S5P_CLKDIV0_HCLK_MASK);
+		clk_div0_tmp |= clock_table[iter][2];
+		__raw_writel(clk_div0_tmp, ARM_CLK_DIV);
+
+
+	} else {
+		/* Frequency Up */
+		clk_div0_tmp = __raw_readl(ARM_CLK_DIV) &
+				~(S5P_CLKDIV0_HCLK_MASK);
+		clk_div0_tmp |= clock_table[iter][2];
+		__raw_writel(clk_div0_tmp, ARM_CLK_DIV);
+
+		clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK);
+		clk_div0_tmp |= clock_table[iter][1];
+		__raw_writel(clk_div0_tmp, ARM_CLK_DIV);
+		}
+	local_irq_restore(flags);
+
+	clk->rate = clock_table[iter][0];
+
+	return 0;
+}
+
+static struct clk_ops s5p6440_clkarm_ops = {
+	.get_rate	= s5p6440_armclk_get_rate,
+	.set_rate	= s5p6440_armclk_set_rate,
+	.round_rate	= s5p6440_armclk_round_rate,
+};
+
+static unsigned long s5p6440_clk_doutmpll_get_rate(struct clk *clk)
+{
+	unsigned long rate = clk_get_rate(clk->parent);
+
+	if (__raw_readl(S5P_CLK_DIV0) & S5P_CLKDIV0_MPLL_MASK)
+		rate /= 2;
+
+	return rate;
+}
+
+static struct clk clk_dout_mpll = {
+	.name		= "dout_mpll",
+	.id		= -1,
+	.parent		= &clk_mout_mpll.clk,
+	.ops            = &(struct clk_ops) {
+		.get_rate	= s5p6440_clk_doutmpll_get_rate,
+	},
+};
+
+int s5p6440_clk48m_ctrl(struct clk *clk, int enable)
+{
+	unsigned long flags;
+	u32 val;
+
+	/* can't rely on clock lock, this register has other usages */
+	local_irq_save(flags);
+
+	val = __raw_readl(S5P_OTHERS);
+	if (enable)
+		val |= S5P_OTHERS_USB_SIG_MASK;
+	else
+		val &= ~S5P_OTHERS_USB_SIG_MASK;
+
+	__raw_writel(val, S5P_OTHERS);
+
+	local_irq_restore(flags);
+
+	return 0;
+}
+
+static int s5p6440_pclk_ctrl(struct clk *clk, int enable)
+{
+	return s5p_gatectrl(S5P_CLK_GATE_PCLK, clk, enable);
+}
+
+static int s5p6440_hclk0_ctrl(struct clk *clk, int enable)
+{
+	return s5p_gatectrl(S5P_CLK_GATE_HCLK0, clk, enable);
+}
+
+static int s5p6440_hclk1_ctrl(struct clk *clk, int enable)
+{
+	return s5p_gatectrl(S5P_CLK_GATE_HCLK1, clk, enable);
+}
+
+static int s5p6440_sclk_ctrl(struct clk *clk, int enable)
+{
+	return s5p_gatectrl(S5P_CLK_GATE_SCLK0, clk, enable);
+}
+
+static int s5p6440_mem_ctrl(struct clk *clk, int enable)
+{
+	return s5p_gatectrl(S5P_CLK_GATE_MEM0, clk, enable);
+}
+
+/*
+ * The following clocks will be disabled during clock initialization. It is
+ * recommended to keep the following clocks disabled until the driver requests
+ * for enabling the clock.
+ */
+static struct clk init_clocks_disable[] = {
+	{
+		.name		= "nand",
+		.id		= -1,
+		.parent		= &clk_h,
+		.enable		= s5p6440_mem_ctrl,
+		.ctrlbit	= S5P_CLKCON_MEM0_HCLK_NFCON,
+	}, {
+		.name		= "adc",
+		.id		= -1,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_TSADC,
+	}, {
+		.name		= "i2c",
+		.id		= -1,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_IIC0,
+	}, {
+		.name		= "i2s_v40",
+		.id		= 0,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_IIS2,
+	}, {
+		.name		= "spi",
+		.id		= 0,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_SPI0,
+	}, {
+		.name		= "spi",
+		.id		= 1,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_SPI1,
+	}, {
+		.name		= "sclk_spi_48",
+		.id		= 0,
+		.parent		= &clk_48m,
+		.enable		= s5p6440_sclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_SCLK0_SPI0_48,
+	}, {
+		.name		= "sclk_spi_48",
+		.id		= 1,
+		.parent		= &clk_48m,
+		.enable		= s5p6440_sclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_SCLK0_SPI1_48,
+	}, {
+		.name		= "mmc_48m",
+		.id		= 0,
+		.parent		= &clk_48m,
+		.enable		= s5p6440_sclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_SCLK0_MMC0_48,
+	}, {
+		.name		= "mmc_48m",
+		.id		= 1,
+		.parent		= &clk_48m,
+		.enable		= s5p6440_sclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_SCLK0_MMC1_48,
+	}, {
+		.name		= "mmc_48m",
+		.id		= 2,
+		.parent		= &clk_48m,
+		.enable		= s5p6440_sclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_SCLK0_MMC2_48,
+	}, {
+		.name    	= "otg",
+		.id	   	= -1,
+		.parent  	= &clk_h_low,
+		.enable  	= s5p6440_hclk0_ctrl,
+		.ctrlbit 	= S5P_CLKCON_HCLK0_USB
+	}, {
+		.name    	= "post",
+		.id	   	= -1,
+		.parent  	= &clk_h_low,
+		.enable  	= s5p6440_hclk0_ctrl,
+		.ctrlbit 	= S5P_CLKCON_HCLK0_POST0
+	}, {
+		.name		= "lcd",
+		.id		= -1,
+		.parent		= &clk_h_low,
+		.enable		= s5p6440_hclk1_ctrl,
+		.ctrlbit	= S5P_CLKCON_HCLK1_DISPCON,
+	}, {
+		.name		= "hsmmc",
+		.id		= 0,
+		.parent		= &clk_h_low,
+		.enable		= s5p6440_hclk0_ctrl,
+		.ctrlbit	= S5P_CLKCON_HCLK0_HSMMC0,
+	}, {
+		.name		= "hsmmc",
+		.id		= 1,
+		.parent		= &clk_h_low,
+		.enable		= s5p6440_hclk0_ctrl,
+		.ctrlbit	= S5P_CLKCON_HCLK0_HSMMC1,
+	}, {
+		.name		= "hsmmc",
+		.id		= 2,
+		.parent		= &clk_h_low,
+		.enable		= s5p6440_hclk0_ctrl,
+		.ctrlbit	= S5P_CLKCON_HCLK0_HSMMC2,
+	}, {
+		.name		= "rtc",
+		.id		= -1,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_RTC,
+	}, {
+		.name		= "watchdog",
+		.id		= -1,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_WDT,
+	}, {
+		.name		= "timers",
+		.id		= -1,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_PWM,
+	}
+};
+
+/*
+ * The following clocks will be enabled during clock initialization.
+ */
+static struct clk init_clocks[] = {
+	{
+		.name		= "gpio",
+		.id		= -1,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_GPIO,
+	}, {
+		.name		= "uart",
+		.id		= 0,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_UART0,
+	}, {
+		.name		= "uart",
+		.id		= 1,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_UART1,
+	}, {
+		.name		= "uart",
+		.id		= 2,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_UART2,
+	}, {
+		.name		= "uart",
+		.id		= 3,
+		.parent		= &clk_p_low,
+		.enable		= s5p6440_pclk_ctrl,
+		.ctrlbit	= S5P_CLKCON_PCLK_UART3,
+	}
+};
+
+static struct clk clk_iis_cd_v40 = {
+	.name		= "iis_cdclk_v40",
+	.id		= -1,
+};
+
+static struct clk clk_pcm_cd = {
+	.name		= "pcm_cdclk",
+	.id		= -1,
+};
+
+static struct clk *clkset_spi_mmc_list[] = {
+	&clk_mout_epll.clk,
+	&clk_dout_mpll,
+	&clk_fin_epll,
+};
+
+static struct clksrc_sources clkset_spi_mmc = {
+	.sources	= clkset_spi_mmc_list,
+	.nr_sources	= ARRAY_SIZE(clkset_spi_mmc_list),
+};
+
+static struct clk *clkset_uart_list[] = {
+	&clk_mout_epll.clk,
+	&clk_dout_mpll
+};
+
+static struct clksrc_sources clkset_uart = {
+	.sources	= clkset_uart_list,
+	.nr_sources	= ARRAY_SIZE(clkset_uart_list),
+};
+
+static struct clksrc_clk clksrcs[] = {
+	{
+		.clk	= {
+			.name		= "mmc_bus",
+			.id		= 0,
+			.ctrlbit        = S5P_CLKCON_SCLK0_MMC0,
+			.enable		= s5p6440_sclk_ctrl,
+		},
+		.sources = &clkset_spi_mmc,
+		.reg_src = { .reg = S5P_CLK_SRC0, .shift = 18, .size = 2 },
+		.reg_div = { .reg = S5P_CLK_DIV1, .shift = 0, .size = 4 },
+	}, {
+		.clk	= {
+			.name		= "mmc_bus",
+			.id		= 1,
+			.ctrlbit        = S5P_CLKCON_SCLK0_MMC1,
+			.enable		= s5p6440_sclk_ctrl,
+		},
+		.sources = &clkset_spi_mmc,
+		.reg_src = { .reg = S5P_CLK_SRC0, .shift = 20, .size = 2 },
+		.reg_div = { .reg = S5P_CLK_DIV1, .shift = 4, .size = 4 },
+	}, {
+		.clk	= {
+			.name		= "mmc_bus",
+			.id		= 2,
+			.ctrlbit        = S5P_CLKCON_SCLK0_MMC2,
+			.enable		= s5p6440_sclk_ctrl,
+		},
+		.sources = &clkset_spi_mmc,
+		.reg_src = { .reg = S5P_CLK_SRC0, .shift = 22, .size = 2 },
+		.reg_div = { .reg = S5P_CLK_DIV1, .shift = 8, .size = 4 },
+	}, {
+		.clk	= {
+			.name		= "uclk1",
+			.id		= -1,
+			.ctrlbit        = S5P_CLKCON_SCLK0_UART,
+			.enable		= s5p6440_sclk_ctrl,
+		},
+		.sources = &clkset_uart,
+		.reg_src = { .reg = S5P_CLK_SRC0, .shift = 13, .size = 1 },
+		.reg_div = { .reg = S5P_CLK_DIV2, .shift = 16, .size = 4 },
+	}, {
+		.clk	= {
+			.name		= "spi_epll",
+			.id		= 0,
+			.ctrlbit        = S5P_CLKCON_SCLK0_SPI0,
+			.enable		= s5p6440_sclk_ctrl,
+		},
+		.sources = &clkset_spi_mmc,
+		.reg_src = { .reg = S5P_CLK_SRC0, .shift = 14, .size = 2 },
+		.reg_div = { .reg = S5P_CLK_DIV2, .shift = 0, .size = 4 },
+	}, {
+		.clk	= {
+			.name		= "spi_epll",
+			.id		= 1,
+			.ctrlbit        = S5P_CLKCON_SCLK0_SPI1,
+			.enable		= s5p6440_sclk_ctrl,
+		},
+		.sources = &clkset_spi_mmc,
+		.reg_src = { .reg = S5P_CLK_SRC0, .shift = 16, .size = 2 },
+		.reg_div = { .reg = S5P_CLK_DIV2, .shift = 4, .size = 4 },
+	}
+};
+
+/* Clock initialisation code */
+static struct clksrc_clk *init_parents[] = {
+	&clk_mout_apll,
+	&clk_mout_epll,
+	&clk_mout_mpll,
+};
+
+void __init_or_cpufreq s5p6440_setup_clocks(void)
+{
+	struct clk *xtal_clk;
+	unsigned long xtal;
+	unsigned long fclk;
+	unsigned long hclk;
+	unsigned long hclk_low;
+	unsigned long pclk;
+	unsigned long pclk_low;
+	unsigned long epll;
+	unsigned long apll;
+	unsigned long mpll;
+	unsigned int ptr;
+	u32 clkdiv0;
+	u32 clkdiv3;
+
+	/* Set S5P6440 functions for clk_fout_epll */
+	clk_fout_epll.enable = s5p6440_epll_enable;
+	clk_fout_epll.ops = &s5p6440_epll_ops;
+
+	/* Set S5P6440 functions for arm clock */
+	clk_arm.parent = &clk_mout_apll.clk;
+	clk_arm.ops = &s5p6440_clkarm_ops;
+	clk_48m.enable = s5p6440_clk48m_ctrl;
+
+	clkdiv0 = __raw_readl(S5P_CLK_DIV0);
+	clkdiv3 = __raw_readl(S5P_CLK_DIV3);
+
+	xtal_clk = clk_get(NULL, "ext_xtal");
+	BUG_ON(IS_ERR(xtal_clk));
+
+	xtal = clk_get_rate(xtal_clk);
+	clk_put(xtal_clk);
+
+	epll = s5p_get_pll90xx(xtal, __raw_readl(S5P_EPLL_CON),
+				__raw_readl(S5P_EPLL_CON_K));
+	mpll = s5p_get_pll45xx(xtal, __raw_readl(S5P_MPLL_CON), pll_4502);
+	apll = s5p_get_pll45xx(xtal, __raw_readl(S5P_APLL_CON), pll_4502);
+
+	printk(KERN_INFO "S5P6440: PLL settings, A=%ld.%ldMHz, M=%ld.%ldMHz," \
+			" E=%ld.%ldMHz\n",
+			print_mhz(apll), print_mhz(mpll), print_mhz(epll));
+
+	fclk = apll / GET_DIV(clkdiv0, S5P_CLKDIV0_ARM);
+	hclk = fclk / GET_DIV(clkdiv0, S5P_CLKDIV0_HCLK);
+	pclk = hclk / GET_DIV(clkdiv0, S5P_CLKDIV0_PCLK);
+
+	if (__raw_readl(S5P_OTHERS) & S5P_OTHERS_HCLK_LOW_SEL_MPLL) {
+		/* Asynchronous mode */
+		hclk_low = mpll / GET_DIV(clkdiv3, S5P_CLKDIV3_HCLK_LOW);
+	} else {
+		/* Synchronous mode */
+		hclk_low = apll / GET_DIV(clkdiv3, S5P_CLKDIV3_HCLK_LOW);
+	}
+
+	pclk_low = hclk_low / GET_DIV(clkdiv3, S5P_CLKDIV3_PCLK_LOW);
+
+	printk(KERN_INFO "S5P6440: HCLK=%ld.%ldMHz, HCLK_LOW=%ld.%ldMHz," \
+			" PCLK=%ld.%ldMHz, PCLK_LOW=%ld.%ldMHz\n",
+			print_mhz(hclk), print_mhz(hclk_low),
+			print_mhz(pclk), print_mhz(pclk_low));
+
+	clk_fout_mpll.rate = mpll;
+	clk_fout_epll.rate = epll;
+	clk_fout_apll.rate = apll;
+
+	clk_f.rate = fclk;
+	clk_h.rate = hclk;
+	clk_p.rate = pclk;
+	clk_h_low.rate = hclk_low;
+	clk_p_low.rate = pclk_low;
+
+	for (ptr = 0; ptr < ARRAY_SIZE(init_parents); ptr++)
+		s3c_set_clksrc(init_parents[ptr], true);
+
+	for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
+		s3c_set_clksrc(&clksrcs[ptr], true);
+}
+
+static struct clk *clks[] __initdata = {
+	&clk_ext,
+	&clk_mout_epll.clk,
+	&clk_mout_mpll.clk,
+	&clk_dout_mpll,
+	&clk_iis_cd_v40,
+	&clk_pcm_cd,
+	&clk_p_low,
+	&clk_h_low,
+};
+
+void __init s5p6440_register_clocks(void)
+{
+	struct clk *clkp;
+	int ret;
+	int ptr;
+
+	ret = s3c24xx_register_clocks(clks, ARRAY_SIZE(clks));
+	if (ret > 0)
+		printk(KERN_ERR "Failed to register %u clocks\n", ret);
+
+	s3c_register_clksrc(clksrcs, ARRAY_SIZE(clksrcs));
+	s3c_register_clocks(init_clocks, ARRAY_SIZE(init_clocks));
+
+	clkp = init_clocks_disable;
+	for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) {
+
+		ret = s3c24xx_register_clock(clkp);
+		if (ret < 0) {
+			printk(KERN_ERR "Failed to register clock %s (%d)\n",
+			       clkp->name, ret);
+		}
+		(clkp->enable)(clkp, 0);
+	}
+
+	s3c_pwmclk_init();
+}
diff --git a/arch/arm/mach-s5p6440/s5p6440-gpio.c b/arch/arm/mach-s5p6440/gpio.c
index 742264c..b0ea741 100644
--- a/arch/arm/mach-s5p6440/s5p6440-gpio.c
+++ b/arch/arm/mach-s5p6440/gpio.c
@@ -1,4 +1,4 @@
-/* arch/arm/mach-s5p6440/s5p6440-gpio.c
+/* arch/arm/mach-s5p6440/gpio.c
  *
  * Copyright (c) 2009 Samsung Electronics Co., Ltd.
  * 		http://www.samsung.com/
diff --git a/arch/arm/mach-s5p6440/init.c b/arch/arm/mach-s5p6440/init.c
new file mode 100644
index 0000000..a1f3727
--- /dev/null
+++ b/arch/arm/mach-s5p6440/init.c
@@ -0,0 +1,52 @@
+/* linux/arch/arm/mach-s5p6440/init.c
+ *
+ * Copyright (c) 2009 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com/
+ *
+ * S5P6440 - Init 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/kernel.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/serial_core.h>
+
+#include <plat/cpu.h>
+#include <plat/devs.h>
+#include <plat/s5p6440.h>
+#include <plat/regs-serial.h>
+
+static struct s3c24xx_uart_clksrc s5p6440_serial_clocks[] = {
+	[0] = {
+		.name		= "pclk_low",
+		.divisor	= 1,
+		.min_baud	= 0,
+		.max_baud	= 0,
+	},
+	[1] = {
+		.name		= "uclk1",
+		.divisor	= 1,
+		.min_baud	= 0,
+		.max_baud	= 0,
+	},
+};
+
+/* uart registration process */
+void __init s5p6440_common_init_uarts(struct s3c2410_uartcfg *cfg, int no)
+{
+	struct s3c2410_uartcfg *tcfg = cfg;
+	u32 ucnt;
+
+	for (ucnt = 0; ucnt < no; ucnt++, tcfg++) {
+		if (!tcfg->clocks) {
+			tcfg->clocks = s5p6440_serial_clocks;
+			tcfg->clocks_size = ARRAY_SIZE(s5p6440_serial_clocks);
+		}
+	}
+
+	s3c24xx_init_uartdevs("s3c6400-uart", s5p_uart_resources, cfg, no);
+}