linux-vybrid_public/arch/arm/mach-s5p6440/clock.c

/* 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 },
};

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 struct clksrc_clk clk_armclk = {
	.clk	= {
		.name	= "armclk",
		.id	= 1,
		.parent	= &clk_mout_apll.clk,
		.ops	= &s5p6440_clkarm_ops,
	},
	.reg_div	= { .reg = S5P_CLK_DIV0, .shift = 0, .size = 4 },
};

static struct clksrc_clk clk_dout_mpll = {
	.clk	= {
		.name	= "dout_mpll",
		.id	= -1,
		.parent	= &clk_mout_mpll.clk,
	},
	.reg_div	= { .reg = S5P_CLK_DIV0, .shift = 4, .size = 1 },
};

static struct clksrc_clk clk_hclk = {
	.clk	= {
		.name	= "clk_hclk",
		.id	= -1,
		.parent	= &clk_armclk.clk,
	},
	.reg_div	= { .reg = S5P_CLK_DIV0, .shift = 8, .size = 4 },
};

static struct clksrc_clk clk_pclk = {
	.clk	= {
		.name	= "clk_pclk",
		.id	= -1,
		.parent	= &clk_hclk.clk,
	},
	.reg_div = { .reg = S5P_CLK_DIV0, .shift = 12, .size = 4 },
};

static struct clk *clkset_hclklow_list[] = {
	&clk_mout_apll.clk,
	&clk_mout_mpll.clk,
};

static struct clksrc_sources clkset_hclklow = {
	.sources	= clkset_hclklow_list,
	.nr_sources	= ARRAY_SIZE(clkset_hclklow_list),
};

static struct clksrc_clk clk_hclk_low = {
	.clk = {
		.name	= "hclk_low",
		.id	= -1,
	},
	.sources	= &clkset_hclklow,
	.reg_src	= { .reg = S5P_SYS_OTHERS, .shift = 6, .size = 1 },
	.reg_div	= { .reg = S5P_CLK_DIV3, .shift = 8, .size = 4 },
};

static struct clksrc_clk clk_pclk_low = {
	.clk	= {
		.name	= "pclk_low",
		.id	= -1,
		.parent	= &clk_hclk_low.clk,
	},
	.reg_div = { .reg = S5P_CLK_DIV3, .shift = 12, .size = 4 },
};

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_hclk.clk,
		.enable		= s5p6440_mem_ctrl,
		.ctrlbit	= S5P_CLKCON_MEM0_HCLK_NFCON,
	}, {
		.name		= "adc",
		.id		= -1,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= S5P_CLKCON_PCLK_TSADC,
	}, {
		.name		= "i2c",
		.id		= -1,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= S5P_CLKCON_PCLK_IIC0,
	}, {
		.name		= "i2s_v40",
		.id		= 0,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= S5P_CLKCON_PCLK_IIS2,
	}, {
		.name		= "spi",
		.id		= 0,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= S5P_CLKCON_PCLK_SPI0,
	}, {
		.name		= "spi",
		.id		= 1,
		.parent		= &clk_pclk_low.clk,
		.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_hclk_low.clk,
		.enable  	= s5p6440_hclk0_ctrl,
		.ctrlbit 	= S5P_CLKCON_HCLK0_USB
	}, {
		.name    	= "post",
		.id	   	= -1,
		.parent		= &clk_hclk_low.clk,
		.enable  	= s5p6440_hclk0_ctrl,
		.ctrlbit 	= S5P_CLKCON_HCLK0_POST0
	}, {
		.name		= "lcd",
		.id		= -1,
		.parent		= &clk_hclk_low.clk,
		.enable		= s5p6440_hclk1_ctrl,
		.ctrlbit	= S5P_CLKCON_HCLK1_DISPCON,
	}, {
		.name		= "hsmmc",
		.id		= 0,
		.parent		= &clk_hclk_low.clk,
		.enable		= s5p6440_hclk0_ctrl,
		.ctrlbit	= S5P_CLKCON_HCLK0_HSMMC0,
	}, {
		.name		= "hsmmc",
		.id		= 1,
		.parent		= &clk_hclk_low.clk,
		.enable		= s5p6440_hclk0_ctrl,
		.ctrlbit	= S5P_CLKCON_HCLK0_HSMMC1,
	}, {
		.name		= "hsmmc",
		.id		= 2,
		.parent		= &clk_hclk_low.clk,
		.enable		= s5p6440_hclk0_ctrl,
		.ctrlbit	= S5P_CLKCON_HCLK0_HSMMC2,
	}, {
		.name		= "rtc",
		.id		= -1,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= S5P_CLKCON_PCLK_RTC,
	}, {
		.name		= "watchdog",
		.id		= -1,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= S5P_CLKCON_PCLK_WDT,
	}, {
		.name		= "timers",
		.id		= -1,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= S5P_CLKCON_PCLK_PWM,
	}, {
		.name		= "hclk_fimgvg",
		.id		= -1,
		.parent		= &clk_hclk.clk,
		.enable		= s5p6440_hclk1_ctrl,
		.ctrlbit	= (1 << 2),
	}, {
		.name		= "tsi",
		.id		= -1,
		.parent		= &clk_hclk_low.clk,
		.enable		= s5p6440_hclk1_ctrl,
		.ctrlbit	= (1 << 0),
	}, {
		.name		= "pclk_fimgvg",
		.id		= -1,
		.parent		= &clk_pclk.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= (1 << 31),
	}, {
		.name		= "dmc0",
		.id		= -1,
		.parent		= &clk_pclk.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= (1 << 30),
	}, {
		.name		= "etm",
		.id		= -1,
		.parent		= &clk_pclk.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= (1 << 29),
	}, {
		.name		= "dsim",
		.id		= -1,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= (1 << 28),
	}, {
		.name		= "gps",
		.id		= -1,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= (1 << 25),
	}, {
		.name		= "pcm",
		.id		= -1,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= (1 << 8),
	}, {
		.name		= "irom",
		.id		= -1,
		.parent		= &clk_hclk.clk,
		.enable		= s5p6440_hclk0_ctrl,
		.ctrlbit	= (1 << 25),
	}, {
		.name		= "dma",
		.id		= -1,
		.parent		= &clk_hclk_low.clk,
		.enable		= s5p6440_hclk0_ctrl,
		.ctrlbit	= (1 << 12),
	}, {
		.name		= "2d",
		.id		= -1,
		.parent		= &clk_hclk.clk,
		.enable		= s5p6440_hclk0_ctrl,
		.ctrlbit	= (1 << 8),
	},
};

/*
 * The following clocks will be enabled during clock initialization.
 */
static struct clk init_clocks[] = {
	{
		.name		= "gpio",
		.id		= -1,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= S5P_CLKCON_PCLK_GPIO,
	}, {
		.name		= "uart",
		.id		= 0,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= S5P_CLKCON_PCLK_UART0,
	}, {
		.name		= "uart",
		.id		= 1,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= S5P_CLKCON_PCLK_UART1,
	}, {
		.name		= "uart",
		.id		= 2,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= S5P_CLKCON_PCLK_UART2,
	}, {
		.name		= "uart",
		.id		= 3,
		.parent		= &clk_pclk_low.clk,
		.enable		= s5p6440_pclk_ctrl,
		.ctrlbit	= S5P_CLKCON_PCLK_UART3,
	}, {
		.name		= "mem",
		.id		= -1,
		.parent		= &clk_hclk.clk,
		.enable		= s5p6440_hclk0_ctrl,
		.ctrlbit	= (1 << 21),
	}, {
		.name		= "intc",
		.id		= -1,
		.parent		= &clk_hclk.clk,
		.enable		= s5p6440_hclk0_ctrl,
		.ctrlbit	= (1 << 1),
	},
};

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,
	&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.clk,
};

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 *sysclks[] = {
	&clk_mout_apll,
	&clk_mout_epll,
	&clk_mout_mpll,
	&clk_dout_mpll,
	&clk_armclk,
	&clk_hclk,
	&clk_pclk,
	&clk_hclk_low,
	&clk_pclk_low,
};

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;

	/* Set S5P6440 functions for clk_fout_epll */
	clk_fout_epll.enable = s5p6440_epll_enable;
	clk_fout_epll.ops = &s5p6440_epll_ops;

	clk_48m.enable = s5p6440_clk48m_ctrl;

	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);

	clk_fout_mpll.rate = mpll;
	clk_fout_epll.rate = epll;
	clk_fout_apll.rate = apll;

	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 = clk_get_rate(&clk_armclk.clk);
	hclk = clk_get_rate(&clk_hclk.clk);
	pclk = clk_get_rate(&clk_pclk.clk);
	hclk_low = clk_get_rate(&clk_hclk_low.clk);
	pclk_low = clk_get_rate(&clk_pclk_low.clk);

	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_f.rate = fclk;
	clk_h.rate = hclk;
	clk_p.rate = pclk;

	for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
		s3c_set_clksrc(&clksrcs[ptr], true);
}

static struct clk *clks[] __initdata = {
	&clk_ext,
	&clk_iis_cd_v40,
	&clk_pcm_cd,
};

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);

	for (ptr = 0; ptr < ARRAY_SIZE(sysclks); ptr++)
		s3c_register_clksrc(sysclks[ptr], 1);

	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();
}