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generic.c

/*
 *  linux/arch/arm/mach-pxa/generic.c
 *
 *  Author: Nicolas Pitre
 *  Created:      Jun 15, 2001
 *  Copyright:    MontaVista Software Inc.
 *
 * Code common to all PXA machines.
 *
 * 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.
 *
 * Since this file should be linked before any other machine specific file,
 * the __initcall() here will be executed first.  This serves as default
 * initialization stuff for PXA machines which can be overridden later if
 * need be.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>

#include <mach/hardware.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/mach/map.h>
#include <asm/mach-types.h>

#include <mach/reset.h>
#include <mach/gpio.h>
#include <mach/pxa2xx-gpio.h>

#include "generic.h"

void clear_reset_status(unsigned int mask)
{
      if (cpu_is_pxa2xx())
            pxa2xx_clear_reset_status(mask);

      if (cpu_is_pxa3xx())
            pxa3xx_clear_reset_status(mask);
}

unsigned long get_clock_tick_rate(void)
{
      unsigned long clock_tick_rate;

      if (cpu_is_pxa25x())
            clock_tick_rate = 3686400;
      else if (machine_is_mainstone())
            clock_tick_rate = 3249600;
      else
            clock_tick_rate = 3250000;

      return clock_tick_rate;
}
EXPORT_SYMBOL(get_clock_tick_rate);

/*
 * Get the clock frequency as reflected by CCCR and the turbo flag.
 * We assume these values have been applied via a fcs.
 * If info is not 0 we also display the current settings.
 */
unsigned int get_clk_frequency_khz(int info)
{
      if (cpu_is_pxa25x())
            return pxa25x_get_clk_frequency_khz(info);
      else if (cpu_is_pxa27x())
            return pxa27x_get_clk_frequency_khz(info);
      else
            return pxa3xx_get_clk_frequency_khz(info);
}
EXPORT_SYMBOL(get_clk_frequency_khz);

/*
 * Return the current memory clock frequency in units of 10kHz
 */
unsigned int get_memclk_frequency_10khz(void)
{
      if (cpu_is_pxa25x())
            return pxa25x_get_memclk_frequency_10khz();
      else if (cpu_is_pxa27x())
            return pxa27x_get_memclk_frequency_10khz();
      else
            return pxa3xx_get_memclk_frequency_10khz();
}
EXPORT_SYMBOL(get_memclk_frequency_10khz);

/*
 * Intel PXA2xx internal register mapping.
 *
 * Note 1: not all PXA2xx variants implement all those addresses.
 *
 * Note 2: virtual 0xfffe0000-0xffffffff is reserved for the vector table
 *         and cache flush area.
 */
static struct map_desc standard_io_desc[] __initdata = {
      {     /* Devs */
            .virtual    =  0xf2000000,
            .pfn        = __phys_to_pfn(0x40000000),
            .length           = 0x02000000,
            .type       = MT_DEVICE
      }, {  /* Mem Ctl */
            .virtual    =  0xf6000000,
            .pfn        = __phys_to_pfn(0x48000000),
            .length           = 0x00200000,
            .type       = MT_DEVICE
      }, {  /* Camera */
            .virtual    =  0xfa000000,
            .pfn        = __phys_to_pfn(0x50000000),
            .length           = 0x00100000,
            .type       = MT_DEVICE
      }, {  /* IMem ctl */
            .virtual    =  0xfe000000,
            .pfn        = __phys_to_pfn(0x58000000),
            .length           = 0x00100000,
            .type       = MT_DEVICE
      }, {  /* UNCACHED_PHYS_0 */
            .virtual    = 0xff000000,
            .pfn        = __phys_to_pfn(0x00000000),
            .length           = 0x00100000,
            .type       = MT_DEVICE
      }
};

void __init pxa_map_io(void)
{
      iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
      get_clk_frequency_khz(1);
}

/*
 * Configure pins for GPIO or other functions
 */
int pxa_gpio_mode(int gpio_mode)
{
      unsigned long flags;
      int gpio = gpio_mode & GPIO_MD_MASK_NR;
      int fn = (gpio_mode & GPIO_MD_MASK_FN) >> 8;
      int gafr;

      if (gpio > pxa_last_gpio)
            return -EINVAL;

      local_irq_save(flags);
      if (gpio_mode & GPIO_DFLT_LOW)
            GPCR(gpio) = GPIO_bit(gpio);
      else if (gpio_mode & GPIO_DFLT_HIGH)
            GPSR(gpio) = GPIO_bit(gpio);
      if (gpio_mode & GPIO_MD_MASK_DIR)
            GPDR(gpio) |= GPIO_bit(gpio);
      else
            GPDR(gpio) &= ~GPIO_bit(gpio);
      gafr = GAFR(gpio) & ~(0x3 << (((gpio) & 0xf)*2));
      GAFR(gpio) = gafr |  (fn  << (((gpio) & 0xf)*2));
      local_irq_restore(flags);

      return 0;
}
EXPORT_SYMBOL(pxa_gpio_mode);

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