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s3c2412.c

/* linux/arch/arm/mach-s3c2412/s3c2412.c
 *
 * Copyright (c) 2006 Simtec Electronics
 *    Ben Dooks <ben@simtec.co.uk>
 *
 * http://armlinux.simtec.co.uk/.
 *
 * 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/delay.h>
#include <linux/sysdev.h>
#include <linux/serial_core.h>
#include <linux/platform_device.h>

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

#include <mach/hardware.h>
#include <asm/proc-fns.h>
#include <asm/io.h>
#include <asm/irq.h>

#include <mach/reset.h>
#include <mach/idle.h>

#include <mach/regs-clock.h>
#include <asm/plat-s3c/regs-serial.h>
#include <mach/regs-power.h>
#include <mach/regs-gpio.h>
#include <mach/regs-gpioj.h>
#include <mach/regs-dsc.h>
#include <asm/plat-s3c24xx/regs-spi.h>
#include <mach/regs-s3c2412.h>

#include <asm/plat-s3c24xx/s3c2412.h>
#include <asm/plat-s3c24xx/cpu.h>
#include <asm/plat-s3c24xx/devs.h>
#include <asm/plat-s3c24xx/clock.h>
#include <asm/plat-s3c24xx/pm.h>

#ifndef CONFIG_CPU_S3C2412_ONLY
void __iomem *s3c24xx_va_gpio2 = S3C24XX_VA_GPIO;

static inline void s3c2412_init_gpio2(void)
{
      s3c24xx_va_gpio2 = S3C24XX_VA_GPIO + 0x10;
}
#else
#define s3c2412_init_gpio2() do { } while(0)
#endif

/* Initial IO mappings */

static struct map_desc s3c2412_iodesc[] __initdata = {
      IODESC_ENT(CLKPWR),
      IODESC_ENT(TIMER),
      IODESC_ENT(WATCHDOG),
};

/* uart registration process */

void __init s3c2412_init_uarts(struct s3c2410_uartcfg *cfg, int no)
{
      s3c24xx_init_uartdevs("s3c2412-uart", s3c2410_uart_resources, cfg, no);

      /* rename devices that are s3c2412/s3c2413 specific */
      s3c_device_sdi.name  = "s3c2412-sdi";
      s3c_device_lcd.name  = "s3c2412-lcd";
      s3c_device_nand.name = "s3c2412-nand";

      /* alter IRQ of SDI controller */

      s3c_device_sdi.resource[1].start = IRQ_S3C2412_SDI;
      s3c_device_sdi.resource[1].end   = IRQ_S3C2412_SDI;

      /* spi channel related changes, s3c2412/13 specific */
      s3c_device_spi0.name = "s3c2412-spi";
      s3c_device_spi0.resource[0].end = S3C24XX_PA_SPI + 0x24;
      s3c_device_spi1.name = "s3c2412-spi";
      s3c_device_spi1.resource[0].start = S3C24XX_PA_SPI + S3C2412_SPI1;
      s3c_device_spi1.resource[0].end = S3C24XX_PA_SPI + S3C2412_SPI1 + 0x24;

}

/* s3c2412_idle
 *
 * use the standard idle call by ensuring the idle mode
 * in power config, then issuing the idle co-processor
 * instruction
*/

static void s3c2412_idle(void)
{
      unsigned long tmp;

      /* ensure our idle mode is to go to idle */

      tmp = __raw_readl(S3C2412_PWRCFG);
      tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
      tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
      __raw_writel(tmp, S3C2412_PWRCFG);

      cpu_do_idle();
}

static void s3c2412_hard_reset(void)
{
      /* errata "Watch-dog/Software Reset Problem" specifies that
       * this reset must be done with the SYSCLK sourced from
       * EXTCLK instead of FOUT to avoid a glitch in the reset
       * mechanism.
       *
       * See the watchdog section of the S3C2412 manual for more
       * information on this fix.
       */

      __raw_writel(0x00, S3C2412_CLKSRC);
      __raw_writel(S3C2412_SWRST_RESET, S3C2412_SWRST);

      mdelay(1);
}

/* s3c2412_map_io
 *
 * register the standard cpu IO areas, and any passed in from the
 * machine specific initialisation.
*/

void __init s3c2412_map_io(struct map_desc *mach_desc, int mach_size)
{
      /* move base of IO */

      s3c2412_init_gpio2();

      /* set our idle function */

      s3c24xx_idle = s3c2412_idle;

      /* set custom reset hook */

      s3c24xx_reset_hook = s3c2412_hard_reset;

      /* register our io-tables */

      iotable_init(s3c2412_iodesc, ARRAY_SIZE(s3c2412_iodesc));
      iotable_init(mach_desc, mach_size);
}

void __init s3c2412_init_clocks(int xtal)
{
      unsigned long tmp;
      unsigned long fclk;
      unsigned long hclk;
      unsigned long pclk;

      /* 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);

      clk_mpll.rate = fclk;

      tmp = __raw_readl(S3C2410_CLKDIVN);

      /* work out clock scalings */

      hclk = fclk / ((tmp & S3C2412_CLKDIVN_HDIVN_MASK) + 1);
      hclk /= ((tmp & S3C2412_CLKDIVN_ARMDIVN) ? 2 : 1);
      pclk = hclk / ((tmp & S3C2412_CLKDIVN_PDIVN) ? 2 : 1);

      /* print brieft summary of clocks, etc */

      printk("S3C2412: 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(xtal, fclk, hclk, pclk);
      s3c2412_baseclk_add();
}

/* 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 s3c2412 based system)
 * as a driver which may support both 2410 and 2440 may try and use it.
*/

struct sysdev_class s3c2412_sysclass = {
      .name = "s3c2412-core",
};

static int __init s3c2412_core_init(void)
{
      return sysdev_class_register(&s3c2412_sysclass);
}

core_initcall(s3c2412_core_init);

static struct sys_device s3c2412_sysdev = {
      .cls        = &s3c2412_sysclass,
};

int __init s3c2412_init(void)
{
      printk("S3C2412: Initialising architecture\n");

      return sysdev_register(&s3c2412_sysdev);
}

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