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s3c2410.c

/* linux/arch/arm/mach-s3c2410/s3c2410.c
 *
 * Copyright (c) 2003-2005 Simtec Electronics
 *    Ben Dooks <ben@simtec.co.uk>
 *
 * http://www.simtec.co.uk/products/EB2410ITX/
 *
 * 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/clk.h>
#include <linux/sysdev.h>
#include <linux/serial_core.h>
#include <linux/platform_device.h>
#include <linux/io.h>

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

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

#include <plat/cpu-freq.h>

#include <mach/regs-clock.h>
#include <plat/regs-serial.h>

#include <plat/s3c2410.h>
#include <plat/cpu.h>
#include <plat/devs.h>
#include <plat/clock.h>
#include <plat/pll.h>

/* Initial IO mappings */

static struct map_desc s3c2410_iodesc[] __initdata = {
      IODESC_ENT(CLKPWR),
      IODESC_ENT(TIMER),
      IODESC_ENT(WATCHDOG),
};

/* our uart devices */

/* uart registration process */

void __init s3c2410_init_uarts(struct s3c2410_uartcfg *cfg, int no)
{
      s3c24xx_init_uartdevs("s3c2410-uart", s3c2410_uart_resources, cfg, no);
}

/* s3c2410_map_io
 *
 * register the standard cpu IO areas, and any passed in from the
 * machine specific initialisation.
*/

void __init s3c2410_map_io(void)
{
      iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc));
}

void __init_or_cpufreq s3c2410_setup_clocks(void)
{
      struct clk *xtal_clk;
      unsigned long tmp;
      unsigned long xtal;
      unsigned long fclk;
      unsigned long hclk;
      unsigned long pclk;

      xtal_clk = clk_get(NULL, "xtal");
      xtal = clk_get_rate(xtal_clk);
      clk_put(xtal_clk);

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

      fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal);

      tmp = __raw_readl(S3C2410_CLKDIVN);

      /* work out clock scalings */

      hclk = fclk / ((tmp & S3C2410_CLKDIVN_HDIVN) ? 2 : 1);
      pclk = hclk / ((tmp & S3C2410_CLKDIVN_PDIVN) ? 2 : 1);

      /* print brieft summary of clocks, etc */

      printk("S3C2410: 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
       */

      s3c24xx_setup_clocks(fclk, hclk, pclk);
}

/* fake ARMCLK for use with cpufreq, etc. */

static struct clk s3c2410_armclk = {
      .name = "armclk",
      .parent     = &clk_f,
      .id   = -1,
};

void __init s3c2410_init_clocks(int xtal)
{
      s3c24xx_register_baseclocks(xtal);
      s3c2410_setup_clocks();
      s3c2410_baseclk_add();
      s3c24xx_register_clock(&s3c2410_armclk);
}

struct sysdev_class s3c2410_sysclass = {
      .name = "s3c2410-core",
};

/* Note, we would have liked to name this s3c2410-core, but we cannot
 * register two sysdev_class with the same name.
 */
struct sysdev_class s3c2410a_sysclass = {
      .name = "s3c2410a-core",
};

static struct sys_device s3c2410_sysdev = {
      .cls        = &s3c2410_sysclass,
};

/* 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 s3c2410 based system)
 * as a driver which may support both 2410 and 2440 may try and use it.
*/

static int __init s3c2410_core_init(void)
{
      return sysdev_class_register(&s3c2410_sysclass);
}

core_initcall(s3c2410_core_init);

static int __init s3c2410a_core_init(void)
{
      return sysdev_class_register(&s3c2410a_sysclass);
}

core_initcall(s3c2410a_core_init);

int __init s3c2410_init(void)
{
      printk("S3C2410: Initialising architecture\n");

      return sysdev_register(&s3c2410_sysdev);
}

int __init s3c2410a_init(void)
{
      s3c2410_sysdev.cls = &s3c2410a_sysclass;
      return s3c2410_init();
}

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