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kernel/linux-imx6_3.14.28/arch/arm/mach-pxa/generic.c 2.29 KB
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  /*
   *  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/gpio.h>
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/init.h>
  
  #include <mach/hardware.h>
  #include <asm/mach/map.h>
  #include <asm/mach-types.h>
  
  #include <mach/reset.h>
  #include <mach/smemc.h>
  #include <mach/pxa3xx-regs.h>
  
  #include "generic.h"
  
  void clear_reset_status(unsigned int mask)
  {
  	if (cpu_is_pxa2xx())
  		pxa2xx_clear_reset_status(mask);
  	else {
  		/* RESET_STATUS_* has a 1:1 mapping with ARSR */
  		ARSR = 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);
  	return 0;
  }
  EXPORT_SYMBOL(get_clk_frequency_khz);
  
  /*
   * Intel PXA2xx internal register mapping.
   *
   * Note: virtual 0xfffe0000-0xffffffff is reserved for the vector table
   *       and cache flush area.
   */
  static struct map_desc common_io_desc[] __initdata = {
    	{	/* Devs */
  		.virtual	=  0xf2000000,
  		.pfn		= __phys_to_pfn(0x40000000),
  		.length		= 0x02000000,
  		.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(ARRAY_AND_SIZE(common_io_desc));
  }