arch/arm/mach-pxa/generic.c

   1 /*
   2  *  linux/arch/arm/mach-pxa/generic.c
   3  *
   4  *  Author:     Nicolas Pitre
   5  *  Created:    Jun 15, 2001
   6  *  Copyright:  MontaVista Software Inc.
   7  *
   8  * Code common to all PXA machines.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * Since this file should be linked before any other machine specific file,
  15  * the __initcall() here will be executed first.  This serves as default
  16  * initialization stuff for PXA machines which can be overridden later if
  17  * need be.
  18  */
  19 #include <linux/gpio.h>
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23
  24 #include <mach/hardware.h>
  25 #include <asm/mach/map.h>
  26 #include <asm/mach-types.h>
  27
  28 #include <mach/reset.h>
  29 #include <mach/smemc.h>
  30 #include <mach/pxa3xx-regs.h>
  31
  32 #include "generic.h"
  33
  34 void clear_reset_status(unsigned int mask)
  35 {
  36         if (cpu_is_pxa2xx())
  37                 pxa2xx_clear_reset_status(mask);
  38         else {
  39                 /* RESET_STATUS_* has a 1:1 mapping with ARSR */
  40                 ARSR = mask;
  41         }
  42 }
  43
  44 unsigned long get_clock_tick_rate(void)
  45 {
  46         unsigned long clock_tick_rate;
  47
  48         if (cpu_is_pxa25x())
  49                 clock_tick_rate = 3686400;
  50         else if (machine_is_mainstone())
  51                 clock_tick_rate = 3249600;
  52         else
  53                 clock_tick_rate = 3250000;
  54
  55         return clock_tick_rate;
  56 }
  57 EXPORT_SYMBOL(get_clock_tick_rate);
  58
  59 /*
  60  * Get the clock frequency as reflected by CCCR and the turbo flag.
  61  * We assume these values have been applied via a fcs.
  62  * If info is not 0 we also display the current settings.
  63  */
  64 unsigned int get_clk_frequency_khz(int info)
  65 {
  66         if (cpu_is_pxa25x())
  67                 return pxa25x_get_clk_frequency_khz(info);
  68         else if (cpu_is_pxa27x())
  69                 return pxa27x_get_clk_frequency_khz(info);
  70         return 0;
  71 }
  72 EXPORT_SYMBOL(get_clk_frequency_khz);
  73
  74 /*
  75  * Intel PXA2xx internal register mapping.
  76  *
  77  * Note: virtual 0xfffe0000-0xffffffff is reserved for the vector table
  78  *       and cache flush area.
  79  */
  80 static struct map_desc common_io_desc[] __initdata = {
  81         {       /* Devs */
  82                 .virtual        =  0xf2000000,
  83                 .pfn            = __phys_to_pfn(0x40000000),
  84                 .length         = 0x02000000,
  85                 .type           = MT_DEVICE
  86         }, {    /* UNCACHED_PHYS_0 */
  87                 .virtual        = 0xff000000,
  88                 .pfn            = __phys_to_pfn(0x00000000),
  89                 .length         = 0x00100000,
  90                 .type           = MT_DEVICE
  91         }
  92 };
  93
  94 void __init pxa_map_io(void)
  95 {
  96         iotable_init(ARRAY_AND_SIZE(common_io_desc));
  97 }