/* linux/arch/arm/plat-s3c64xx/clock.c
 *
 * Copyright 2008 Openmoko, Inc.
 * Copyright 2008 Simtec Electronics
 *      Ben Dooks <ben@simtec.co.uk>
 *      http://armlinux.simtec.co.uk/
 *
 * S3C64XX Base 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/interrupt.h>
#include <linux/ioport.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>

#include <mach/hardware.h>
#include <mach/map.h>

#include <mach/regs-sys.h>
#include <mach/regs-clock.h>
#include <mach/pll.h>

#include <plat/cpu.h>
#include <plat/devs.h>
#include <plat/cpu-freq.h>
#include <plat/clock.h>
#include <plat/clock-clksrc.h>

/* fin_apll, fin_mpll and fin_epll are all the same clock, which we call
 * ext_xtal_mux for want of an actual name from the manual.
*/

static struct clk clk_ext_xtal_mux = {
        .name           = "ext_xtal",
        .id             = -1,
};

#define clk_fin_apll clk_ext_xtal_mux
#define clk_fin_mpll clk_ext_xtal_mux
#define clk_fin_epll clk_ext_xtal_mux

#define clk_fout_mpll   clk_mpll
#define clk_fout_epll   clk_epll

struct clk clk_h2 = {
        .name           = "hclk2",
        .id             = -1,
        .rate           = 0,
};

struct clk clk_27m = {
        .name           = "clk_27m",
        .id             = -1,
        .rate           = 27000000,
};

static int clk_48m_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(S3C64XX_OTHERS);
        if (enable)
                val |= S3C64XX_OTHERS_USBMASK;
        else
                val &= ~S3C64XX_OTHERS_USBMASK;

        __raw_writel(val, S3C64XX_OTHERS);
        local_irq_restore(flags);

        return 0;
}

struct clk clk_48m = {
        .name           = "clk_48m",
        .id             = -1,
        .rate           = 48000000,
        .enable         = clk_48m_ctrl,
};

struct clk clk_xusbxti = {
        .name           = "xusbxti",
        .id             = -1,
        .rate           = 48000000,
};

static int inline s3c64xx_gate(void __iomem *reg,
                                struct clk *clk,
                                int enable)
{
        unsigned int ctrlbit = clk->ctrlbit;
        u32 con;

        con = __raw_readl(reg);

        if (enable)
                con |= ctrlbit;
        else
                con &= ~ctrlbit;

        __raw_writel(con, reg);
        return 0;
}

static int s3c64xx_pclk_ctrl(struct clk *clk, int enable)
{
        return s3c64xx_gate(S3C_PCLK_GATE, clk, enable);
}

static int s3c64xx_hclk_ctrl(struct clk *clk, int enable)
{
        return s3c64xx_gate(S3C_HCLK_GATE, clk, enable);
}

int s3c64xx_sclk_ctrl(struct clk *clk, int enable)
{
        return s3c64xx_gate(S3C_SCLK_GATE, clk, enable);
}

static struct clk init_clocks_off[] = {
        {
                .name           = "nand",
                .id             = -1,
                .parent         = &clk_h,
        }, {
                .name           = "rtc",
                .id             = -1,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_RTC,
        }, {
                .name           = "adc",
                .id             = -1,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_TSADC,
        }, {
                .name           = "i2c",
                .id             = -1,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_IIC,
        }, {
                .name           = "i2c",
                .id             = 1,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C6410_CLKCON_PCLK_I2C1,
        }, {
                .name           = "iis",
                .id             = 0,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_IIS0,
        }, {
                .name           = "iis",
                .id             = 1,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_IIS1,
        }, {
#ifdef CONFIG_CPU_S3C6410
                .name           = "iis",
                .id             = -1,  /* There's only one IISv4 port */
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C6410_CLKCON_PCLK_IIS2,
        }, {
#endif
                .name           = "keypad",
                .id             = -1,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_KEYPAD,
        }, {
                .name           = "spi",
                .id             = 0,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_SPI0,
        }, {
                .name           = "spi",
                .id             = 1,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_SPI1,
        }, {
                .name           = "spi_48m",
                .id             = 0,
                .parent         = &clk_48m,
                .enable         = s3c64xx_sclk_ctrl,
                .ctrlbit        = S3C_CLKCON_SCLK_SPI0_48,
        }, {
                .name           = "spi_48m",
                .id             = 1,
                .parent         = &clk_48m,
                .enable         = s3c64xx_sclk_ctrl,
                .ctrlbit        = S3C_CLKCON_SCLK_SPI1_48,
        }, {
                .name           = "48m",
                .id             = 0,
                .parent         = &clk_48m,
                .enable         = s3c64xx_sclk_ctrl,
                .ctrlbit        = S3C_CLKCON_SCLK_MMC0_48,
        }, {
                .name           = "48m",
                .id             = 1,
                .parent         = &clk_48m,
                .enable         = s3c64xx_sclk_ctrl,
                .ctrlbit        = S3C_CLKCON_SCLK_MMC1_48,
        }, {
                .name           = "48m",
                .id             = 2,
                .parent         = &clk_48m,
                .enable         = s3c64xx_sclk_ctrl,
                .ctrlbit        = S3C_CLKCON_SCLK_MMC2_48,
        }, {
                .name           = "dma0",
                .id             = -1,
                .parent         = &clk_h,
                .enable         = s3c64xx_hclk_ctrl,
                .ctrlbit        = S3C_CLKCON_HCLK_DMA0,
        }, {
                .name           = "dma1",
                .id             = -1,
                .parent         = &clk_h,
                .enable         = s3c64xx_hclk_ctrl,
                .ctrlbit        = S3C_CLKCON_HCLK_DMA1,
        },
};

static struct clk init_clocks[] = {
        {
                .name           = "lcd",
                .id             = -1,
                .parent         = &clk_h,
                .enable         = s3c64xx_hclk_ctrl,
                .ctrlbit        = S3C_CLKCON_HCLK_LCD,
        }, {
                .name           = "gpio",
                .id             = -1,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_GPIO,
        }, {
                .name           = "usb-host",
                .id             = -1,
                .parent         = &clk_h,
                .enable         = s3c64xx_hclk_ctrl,
                .ctrlbit        = S3C_CLKCON_HCLK_UHOST,
        }, {
                .name           = "hsmmc",
                .id             = 0,
                .parent         = &clk_h,
                .enable         = s3c64xx_hclk_ctrl,
                .ctrlbit        = S3C_CLKCON_HCLK_HSMMC0,
        }, {
                .name           = "hsmmc",
                .id             = 1,
                .parent         = &clk_h,
                .enable         = s3c64xx_hclk_ctrl,
                .ctrlbit        = S3C_CLKCON_HCLK_HSMMC1,
        }, {
                .name           = "hsmmc",
                .id             = 2,
                .parent         = &clk_h,
                .enable         = s3c64xx_hclk_ctrl,
                .ctrlbit        = S3C_CLKCON_HCLK_HSMMC2,
        }, {
                .name           = "otg",
                .id             = -1,
                .parent         = &clk_h,
                .enable         = s3c64xx_hclk_ctrl,
                .ctrlbit        = S3C_CLKCON_HCLK_USB,
        }, {
                .name           = "timers",
                .id             = -1,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_PWM,
        }, {
                .name           = "uart",
                .id             = 0,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_UART0,
        }, {
                .name           = "uart",
                .id             = 1,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_UART1,
        }, {
                .name           = "uart",
                .id             = 2,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_UART2,
        }, {
                .name           = "uart",
                .id             = 3,
                .parent         = &clk_p,
                .enable         = s3c64xx_pclk_ctrl,
                .ctrlbit        = S3C_CLKCON_PCLK_UART3,
        }, {
                .name           = "watchdog",
                .id             = -1,
                .parent         = &clk_p,
                .ctrlbit        = S3C_CLKCON_PCLK_WDT,
        }, {
                .name           = "ac97",
                .id             = -1,
                .parent         = &clk_p,
                .ctrlbit        = S3C_CLKCON_PCLK_AC97,
        }, {
                .name           = "cfcon",
                .id             = -1,
                .parent         = &clk_h,
                .enable         = s3c64xx_hclk_ctrl,
                .ctrlbit        = S3C_CLKCON_HCLK_IHOST,
        }
};


static struct clk clk_fout_apll = {
        .name           = "fout_apll",
        .id             = -1,
};

static struct clk *clk_src_apll_list[] = {
        [0] = &clk_fin_apll,
        [1] = &clk_fout_apll,
};

static struct clksrc_sources clk_src_apll = {
        .sources        = clk_src_apll_list,
        .nr_sources     = ARRAY_SIZE(clk_src_apll_list),
};

static struct clksrc_clk clk_mout_apll = {
        .clk    = {
                .name           = "mout_apll",
                .id             = -1,
        },
        .reg_src        = { .reg = S3C_CLK_SRC, .shift = 0, .size = 1  },
        .sources        = &clk_src_apll,
};

static struct clk *clk_src_epll_list[] = {
        [0] = &clk_fin_epll,
        [1] = &clk_fout_epll,
};

static struct clksrc_sources clk_src_epll = {
        .sources        = clk_src_epll_list,
        .nr_sources     = ARRAY_SIZE(clk_src_epll_list),
};

static struct clksrc_clk clk_mout_epll = {
        .clk    = {
                .name           = "mout_epll",
                .id             = -1,
        },
        .reg_src        = { .reg = S3C_CLK_SRC, .shift = 2, .size = 1  },
        .sources        = &clk_src_epll,
};

static struct clk *clk_src_mpll_list[] = {
        [0] = &clk_fin_mpll,
        [1] = &clk_fout_mpll,
};

static struct clksrc_sources clk_src_mpll = {
        .sources        = clk_src_mpll_list,
        .nr_sources     = ARRAY_SIZE(clk_src_mpll_list),
};

static struct clksrc_clk clk_mout_mpll = {
        .clk = {
                .name           = "mout_mpll",
                .id             = -1,
        },
        .reg_src        = { .reg = S3C_CLK_SRC, .shift = 1, .size = 1  },
        .sources        = &clk_src_mpll,
};

static unsigned int armclk_mask;

static unsigned long s3c64xx_clk_arm_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(S3C_CLK_DIV0) & armclk_mask;

        return rate / (clkdiv + 1);
}

static unsigned long s3c64xx_clk_arm_round_rate(struct clk *clk,
                                                unsigned long rate)
{
        unsigned long parent = clk_get_rate(clk->parent);
        u32 div;

        if (parent < rate)
                return parent;

        div = (parent / rate) - 1;
        if (div > armclk_mask)
                div = armclk_mask;

        return parent / (div + 1);
}

static int s3c64xx_clk_arm_set_rate(struct clk *clk, unsigned long rate)
{
        unsigned long parent = clk_get_rate(clk->parent);
        u32 div;
        u32 val;

        if (rate < parent / (armclk_mask + 1))
                return -EINVAL;

        rate = clk_round_rate(clk, rate);
        div = clk_get_rate(clk->parent) / rate;

        val = __raw_readl(S3C_CLK_DIV0);
        val &= ~armclk_mask;
        val |= (div - 1);
        __raw_writel(val, S3C_CLK_DIV0);

        return 0;

}

static struct clk clk_arm = {
        .name           = "armclk",
        .id             = -1,
        .parent         = &clk_mout_apll.clk,
        .ops            = &(struct clk_ops) {
                .get_rate       = s3c64xx_clk_arm_get_rate,
                .set_rate       = s3c64xx_clk_arm_set_rate,
                .round_rate     = s3c64xx_clk_arm_round_rate,
        },
};

static unsigned long s3c64xx_clk_doutmpll_get_rate(struct clk *clk)
{
        unsigned long rate = clk_get_rate(clk->parent);

        printk(KERN_DEBUG "%s: parent is %ld\n", __func__, rate);

        if (__raw_readl(S3C_CLK_DIV0) & S3C6400_CLKDIV0_MPLL_MASK)
                rate /= 2;

        return rate;
}

static struct clk_ops clk_dout_ops = {
        .get_rate       = s3c64xx_clk_doutmpll_get_rate,
};

static struct clk clk_dout_mpll = {
        .name           = "dout_mpll",
        .id             = -1,
        .parent         = &clk_mout_mpll.clk,
        .ops            = &clk_dout_ops,
};

static struct clk *clkset_spi_mmc_list[] = {
        &clk_mout_epll.clk,
        &clk_dout_mpll,
        &clk_fin_epll,
        &clk_27m,
};

static struct clksrc_sources clkset_spi_mmc = {
        .sources        = clkset_spi_mmc_list,
        .nr_sources     = ARRAY_SIZE(clkset_spi_mmc_list),
};

static struct clk *clkset_irda_list[] = {
        &clk_mout_epll.clk,
        &clk_dout_mpll,
        NULL,
        &clk_27m,
};

static struct clksrc_sources clkset_irda = {
        .sources        = clkset_irda_list,
        .nr_sources     = ARRAY_SIZE(clkset_irda_list),
};

static struct clk *clkset_uart_list[] = {
        &clk_mout_epll.clk,
        &clk_dout_mpll,
        NULL,
        NULL
};

static struct clksrc_sources clkset_uart = {
        .sources        = clkset_uart_list,
        .nr_sources     = ARRAY_SIZE(clkset_uart_list),
};

static struct clk *clkset_uhost_list[] = {
        &clk_48m,
        &clk_mout_epll.clk,
        &clk_dout_mpll,
        &clk_fin_epll,
};

static struct clksrc_sources clkset_uhost = {
        .sources        = clkset_uhost_list,
        .nr_sources     = ARRAY_SIZE(clkset_uhost_list),
};

/* The peripheral clocks are all controlled via clocksource followed
 * by an optional divider and gate stage. We currently roll this into
 * one clock which hides the intermediate clock from the mux.
 *
 * Note, the JPEG clock can only be an even divider...
 *
 * The scaler and LCD clocks depend on the S3C64XX version, and also
 * have a common parent divisor so are not included here.
 */

/* clocks that feed other parts of the clock source tree */

static struct clk clk_iis_cd0 = {
        .name           = "iis_cdclk0",
        .id             = -1,
};

static struct clk clk_iis_cd1 = {
        .name           = "iis_cdclk1",
        .id             = -1,
};

static struct clk clk_iisv4_cd = {
        .name           = "iis_cdclk_v4",
        .id             = -1,
};

static struct clk clk_pcm_cd = {
        .name           = "pcm_cdclk",
        .id             = -1,
};

static struct clk *clkset_audio0_list[] = {
        [0] = &clk_mout_epll.clk,
        [1] = &clk_dout_mpll,
        [2] = &clk_fin_epll,
        [3] = &clk_iis_cd0,
        [4] = &clk_pcm_cd,
};

static struct clksrc_sources clkset_audio0 = {
        .sources        = clkset_audio0_list,
        .nr_sources     = ARRAY_SIZE(clkset_audio0_list),
};

static struct clk *clkset_audio1_list[] = {
        [0] = &clk_mout_epll.clk,
        [1] = &clk_dout_mpll,
        [2] = &clk_fin_epll,
        [3] = &clk_iis_cd1,
        [4] = &clk_pcm_cd,
};

static struct clksrc_sources clkset_audio1 = {
        .sources        = clkset_audio1_list,
        .nr_sources     = ARRAY_SIZE(clkset_audio1_list),
};

static struct clk *clkset_audio2_list[] = {
        [0] = &clk_mout_epll.clk,
        [1] = &clk_dout_mpll,
        [2] = &clk_fin_epll,
        [3] = &clk_iisv4_cd,
        [4] = &clk_pcm_cd,
};

static struct clksrc_sources clkset_audio2 = {
        .sources        = clkset_audio2_list,
        .nr_sources     = ARRAY_SIZE(clkset_audio2_list),
};

static struct clk *clkset_camif_list[] = {
        &clk_h2,
};

static struct clksrc_sources clkset_camif = {
        .sources        = clkset_camif_list,
        .nr_sources     = ARRAY_SIZE(clkset_camif_list),
};

static struct clksrc_clk clksrcs[] = {
        {
                .clk    = {
                        .name           = "mmc_bus",
                        .id             = 0,
                        .ctrlbit        = S3C_CLKCON_SCLK_MMC0,
                        .enable         = s3c64xx_sclk_ctrl,
                },
                .reg_src        = { .reg = S3C_CLK_SRC, .shift = 18, .size = 2  },
                .reg_div        = { .reg = S3C_CLK_DIV1, .shift = 0, .size = 4  },
                .sources        = &clkset_spi_mmc,
        }, {
                .clk    = {
                        .name           = "mmc_bus",
                        .id             = 1,
                        .ctrlbit        = S3C_CLKCON_SCLK_MMC1,
                        .enable         = s3c64xx_sclk_ctrl,
                },
                .reg_src        = { .reg = S3C_CLK_SRC, .shift = 20, .size = 2  },
                .reg_div        = { .reg = S3C_CLK_DIV1, .shift = 4, .size = 4  },
                .sources        = &clkset_spi_mmc,
        }, {
                .clk    = {
                        .name           = "mmc_bus",
                        .id             = 2,
                        .ctrlbit        = S3C_CLKCON_SCLK_MMC2,
                        .enable         = s3c64xx_sclk_ctrl,
                },
                .reg_src        = { .reg = S3C_CLK_SRC, .shift = 22, .size = 2  },
                .reg_div        = { .reg = S3C_CLK_DIV1, .shift = 8, .size = 4  },
                .sources        = &clkset_spi_mmc,
        }, {
                .clk    = {
                        .name           = "usb-bus-host",
                        .id             = -1,
                        .ctrlbit        = S3C_CLKCON_SCLK_UHOST,
                        .enable         = s3c64xx_sclk_ctrl,
                },
                .reg_src        = { .reg = S3C_CLK_SRC, .shift = 5, .size = 2  },
                .reg_div        = { .reg = S3C_CLK_DIV1, .shift = 20, .size = 4  },
                .sources        = &clkset_uhost,
        }, {
                .clk    = {
                        .name           = "uclk1",
                        .id             = -1,
                        .ctrlbit        = S3C_CLKCON_SCLK_UART,
                        .enable         = s3c64xx_sclk_ctrl,
                },
                .reg_src        = { .reg = S3C_CLK_SRC, .shift = 13, .size = 1  },
                .reg_div        = { .reg = S3C_CLK_DIV2, .shift = 16, .size = 4  },
                .sources        = &clkset_uart,
        }, {
/* Where does UCLK0 come from? */
                .clk    = {
                        .name           = "spi-bus",
                        .id             = 0,
                        .ctrlbit        = S3C_CLKCON_SCLK_SPI0,
                        .enable         = s3c64xx_sclk_ctrl,
                },
                .reg_src        = { .reg = S3C_CLK_SRC, .shift = 14, .size = 2  },
                .reg_div        = { .reg = S3C_CLK_DIV2, .shift = 0, .size = 4  },
                .sources        = &clkset_spi_mmc,
        }, {
                .clk    = {
                        .name           = "spi-bus",
                        .id             = 1,
                        .ctrlbit        = S3C_CLKCON_SCLK_SPI1,
                        .enable         = s3c64xx_sclk_ctrl,
                },
                .reg_src        = { .reg = S3C_CLK_SRC, .shift = 16, .size = 2  },
                .reg_div        = { .reg = S3C_CLK_DIV2, .shift = 4, .size = 4  },
                .sources        = &clkset_spi_mmc,
        }, {
                .clk    = {
                        .name           = "audio-bus",
                        .id             = 0,
                        .ctrlbit        = S3C_CLKCON_SCLK_AUDIO0,
                        .enable         = s3c64xx_sclk_ctrl,
                },
                .reg_src        = { .reg = S3C_CLK_SRC, .shift = 7, .size = 3  },
                .reg_div        = { .reg = S3C_CLK_DIV2, .shift = 8, .size = 4  },
                .sources        = &clkset_audio0,
        }, {
                .clk    = {
                        .name           = "audio-bus",
                        .id             = 1,
                        .ctrlbit        = S3C_CLKCON_SCLK_AUDIO1,
                        .enable         = s3c64xx_sclk_ctrl,
                },
                .reg_src        = { .reg = S3C_CLK_SRC, .shift = 10, .size = 3  },
                .reg_div        = { .reg = S3C_CLK_DIV2, .shift = 12, .size = 4  },
                .sources        = &clkset_audio1,
        }, {
                .clk    = {
                        .name           = "audio-bus",
                        .id             = 2,
                        .ctrlbit        = S3C6410_CLKCON_SCLK_AUDIO2,
                        .enable         = s3c64xx_sclk_ctrl,
                },
                .reg_src        = { .reg = S3C6410_CLK_SRC2, .shift = 0, .size = 3  },
                .reg_div        = { .reg = S3C_CLK_DIV2, .shift = 24, .size = 4  },
                .sources        = &clkset_audio2,
        }, {
                .clk    = {
                        .name           = "irda-bus",
                        .id             = 0,
                        .ctrlbit        = S3C_CLKCON_SCLK_IRDA,
                        .enable         = s3c64xx_sclk_ctrl,
                },
                .reg_src        = { .reg = S3C_CLK_SRC, .shift = 24, .size = 2  },
                .reg_div        = { .reg = S3C_CLK_DIV2, .shift = 20, .size = 4  },
                .sources        = &clkset_irda,
        }, {
                .clk    = {
                        .name           = "camera",
                        .id             = -1,
                        .ctrlbit        = S3C_CLKCON_SCLK_CAM,
                        .enable         = s3c64xx_sclk_ctrl,
                },
                .reg_div        = { .reg = S3C_CLK_DIV0, .shift = 20, .size = 4  },
                .reg_src        = { .reg = NULL, .shift = 0, .size = 0  },
                .sources        = &clkset_camif,
        },
};

/* Clock initialisation code */

static struct clksrc_clk *init_parents[] = {
        &clk_mout_apll,
        &clk_mout_epll,
        &clk_mout_mpll,
};

#define GET_DIV(clk, field) ((((clk) & field##_MASK) >> field##_SHIFT) + 1)

void __init_or_cpufreq s3c6400_setup_clocks(void)
{
        struct clk *xtal_clk;
        unsigned long xtal;
        unsigned long fclk;
        unsigned long hclk;
        unsigned long hclk2;
        unsigned long pclk;
        unsigned long epll;
        unsigned long apll;
        unsigned long mpll;
        unsigned int ptr;
        u32 clkdiv0;

        printk(KERN_DEBUG "%s: registering clocks\n", __func__);

        clkdiv0 = __raw_readl(S3C_CLK_DIV0);
        printk(KERN_DEBUG "%s: clkdiv0 = %08x\n", __func__, clkdiv0);

        xtal_clk = clk_get(NULL, "xtal");
        BUG_ON(IS_ERR(xtal_clk));

        xtal = clk_get_rate(xtal_clk);
        clk_put(xtal_clk);

        printk(KERN_DEBUG "%s: xtal is %ld\n", __func__, xtal);

        /* For now assume the mux always selects the crystal */
        clk_ext_xtal_mux.parent = xtal_clk;

        epll = s3c6400_get_epll(xtal);
        mpll = s3c6400_get_pll(xtal, __raw_readl(S3C_MPLL_CON));
        apll = s3c6400_get_pll(xtal, __raw_readl(S3C_APLL_CON));

        fclk = mpll;

        printk(KERN_INFO "S3C64XX: PLL settings, A=%ld, M=%ld, E=%ld\n",
               apll, mpll, epll);

        hclk2 = mpll / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK2);
        hclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK);
        pclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_PCLK);

        printk(KERN_INFO "S3C64XX: HCLK2=%ld, HCLK=%ld, PCLK=%ld\n",
               hclk2, hclk, pclk);

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

        clk_h2.rate = hclk2;
        clk_h.rate = hclk;
        clk_p.rate = pclk;
        clk_f.rate = fclk;

        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 *clks1[] __initdata = {
        &clk_ext_xtal_mux,
        &clk_iis_cd0,
        &clk_iis_cd1,
        &clk_iisv4_cd,
        &clk_pcm_cd,
        &clk_mout_epll.clk,
        &clk_mout_mpll.clk,
        &clk_dout_mpll,
        &clk_arm,
};

static struct clk *clks[] __initdata = {
        &clk_ext,
        &clk_epll,
        &clk_27m,
        &clk_48m,
        &clk_h2,
        &clk_xusbxti,
};

/**
 * s3c64xx_register_clocks - register clocks for s3c6400 and s3c6410
 * @xtal: The rate for the clock crystal feeding the PLLs.
 * @armclk_divlimit: Divisor mask for ARMCLK.
 *
 * Register the clocks for the S3C6400 and S3C6410 SoC range, such
 * as ARMCLK as well as the necessary parent clocks.
 *
 * This call does not setup the clocks, which is left to the
 * s3c6400_setup_clocks() call which may be needed by the cpufreq
 * or resume code to re-set the clocks if the bootloader has changed
 * them.
 */
void __init s3c64xx_register_clocks(unsigned long xtal, 
                                    unsigned armclk_divlimit)
{
        armclk_mask = armclk_divlimit;

        s3c24xx_register_baseclocks(xtal);
        s3c24xx_register_clocks(clks, ARRAY_SIZE(clks));

        s3c_register_clocks(init_clocks, ARRAY_SIZE(init_clocks));

        s3c_register_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off));
        s3c_disable_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off));

        s3c24xx_register_clocks(clks1, ARRAY_SIZE(clks1));
        s3c_register_clksrc(clksrcs, ARRAY_SIZE(clksrcs));
        s3c_pwmclk_init();
}