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s3c244x.c

/* linux/arch/arm/mach-s3c2410/s3c244x.c
 *
 * Copyright (c) 2004-2006 Simtec Electronics
 *   Ben Dooks <ben@simtec.co.uk>
 *
 * Samsung S3C2440 and S3C2442 Mobile CPU 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/interrupt.h>
#include <linux/list.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/sysdev.h>
#include <linux/clk.h>

#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>

#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/irq.h>

#include <asm/arch/regs-clock.h>
#include <asm/arch/regs-serial.h>
#include <asm/arch/regs-gpio.h>
#include <asm/arch/regs-gpioj.h>
#include <asm/arch/regs-dsc.h>

#include "s3c2410.h"
#include "s3c2440.h"
#include "s3c244x.h"
#include "clock.h"
#include "devs.h"
#include "cpu.h"
#include "pm.h"

static struct map_desc s3c244x_iodesc[] __initdata = {
      IODESC_ENT(CLKPWR),
      IODESC_ENT(TIMER),
      IODESC_ENT(WATCHDOG),
      IODESC_ENT(LCD),
      IODESC_ENT(ADC),
      IODESC_ENT(USBHOST),
};

/* uart initialisation */

void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no)
{
      s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
}

void __init s3c244x_map_io(struct map_desc *mach_desc, int size)
{
      /* register our io-tables */

      iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc));
      iotable_init(mach_desc, size);

      /* rename any peripherals used differing from the s3c2410 */

      s3c_device_i2c.name  = "s3c2440-i2c";
      s3c_device_nand.name = "s3c2440-nand";
      s3c_device_usbgadget.name = "s3c2440-usbgadget";
}

void __init s3c244x_init_clocks(int xtal)
{
      unsigned long clkdiv;
      unsigned long camdiv;
      unsigned long hclk, fclk, pclk;
      int hdiv = 1;

      /* now we've got our machine bits initialised, work out what
       * clocks we've got */

      fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;

      clkdiv = __raw_readl(S3C2410_CLKDIVN);
      camdiv = __raw_readl(S3C2440_CAMDIVN);

      /* work out clock scalings */

      switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
      case S3C2440_CLKDIVN_HDIVN_1:
            hdiv = 1;
            break;

      case S3C2440_CLKDIVN_HDIVN_2:
            hdiv = 2;
            break;

      case S3C2440_CLKDIVN_HDIVN_4_8:
            hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
            break;

      case S3C2440_CLKDIVN_HDIVN_3_6:
            hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
            break;
      }

      hclk = fclk / hdiv;
      pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN)? 2:1);

      /* print brief summary of clocks, etc */

      printk("S3C244X: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
             print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));

      /* initialise the clocks here, to allow other things like the
       * console to use them, and to add new ones after the initialisation
       */

      s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
      s3c2410_baseclk_add();
}

#ifdef CONFIG_PM

static struct sleep_save s3c244x_sleep[] = {
      SAVE_ITEM(S3C2440_DSC0),
      SAVE_ITEM(S3C2440_DSC1),
      SAVE_ITEM(S3C2440_GPJDAT),
      SAVE_ITEM(S3C2440_GPJCON),
      SAVE_ITEM(S3C2440_GPJUP)
};

static int s3c244x_suspend(struct sys_device *dev, pm_message_t state)
{
      s3c2410_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
      return 0;
}

static int s3c244x_resume(struct sys_device *dev)
{
      s3c2410_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
      return 0;
}

#else
#define s3c244x_suspend NULL
#define s3c244x_resume  NULL
#endif

/* Since the S3C2442 and S3C2440 share  items, put both sysclasses here */

struct sysdev_class s3c2440_sysclass = {
      set_kset_name("s3c2440-core"),
      .suspend    = s3c244x_suspend,
      .resume           = s3c244x_resume
};

struct sysdev_class s3c2442_sysclass = {
      set_kset_name("s3c2442-core"),
      .suspend    = s3c244x_suspend,
      .resume           = s3c244x_resume
};

/* need to register class before we actually register the device, and
 * we also need to ensure that it has been initialised before any of the
 * drivers even try to use it (even if not on an s3c2440 based system)
 * as a driver which may support both 2410 and 2440 may try and use it.
*/

static int __init s3c2440_core_init(void)
{
      return sysdev_class_register(&s3c2440_sysclass);
}

core_initcall(s3c2440_core_init);

static int __init s3c2442_core_init(void)
{
      return sysdev_class_register(&s3c2442_sysclass);
}

core_initcall(s3c2442_core_init);

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