release/src-rt-6.x.4708/linux/linux-2.6.36/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/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/init.h>
  22
  23 #include <mach/hardware.h>
  24 #include <asm/system.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/mach/map.h>
  27 #include <asm/mach-types.h>
  28
  29 #include <mach/reset.h>
  30 #include <mach/gpio.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
  39         if (cpu_is_pxa3xx())
  40                 pxa3xx_clear_reset_status(mask);
  41 }
  42
  43 unsigned long get_clock_tick_rate(void)
  44 {
  45         unsigned long clock_tick_rate;
  46
  47         if (cpu_is_pxa25x())
  48                 clock_tick_rate = 3686400;
  49         else if (machine_is_mainstone())
  50                 clock_tick_rate = 3249600;
  51         else
  52                 clock_tick_rate = 3250000;
  53
  54         return clock_tick_rate;
  55 }
  56 EXPORT_SYMBOL(get_clock_tick_rate);
  57
  58 /*
  59  * Get the clock frequency as reflected by CCCR and the turbo flag.
  60  * We assume these values have been applied via a fcs.
  61  * If info is not 0 we also display the current settings.
  62  */
  63 unsigned int get_clk_frequency_khz(int info)
  64 {
  65         if (cpu_is_pxa25x())
  66                 return pxa25x_get_clk_frequency_khz(info);
  67         else if (cpu_is_pxa27x())
  68                 return pxa27x_get_clk_frequency_khz(info);
  69         else
  70                 return pxa3xx_get_clk_frequency_khz(info);
  71 }
  72 EXPORT_SYMBOL(get_clk_frequency_khz);
  73
  74 /*
  75  * Return the current memory clock frequency in units of 10kHz
  76  */
  77 unsigned int get_memclk_frequency_10khz(void)
  78 {
  79         if (cpu_is_pxa25x())
  80                 return pxa25x_get_memclk_frequency_10khz();
  81         else if (cpu_is_pxa27x())
  82                 return pxa27x_get_memclk_frequency_10khz();
  83         else
  84                 return pxa3xx_get_memclk_frequency_10khz();
  85 }
  86 EXPORT_SYMBOL(get_memclk_frequency_10khz);
  87
  88 /*
  89  * Intel PXA2xx internal register mapping.
  90  *
  91  * Note 1: not all PXA2xx variants implement all those addresses.
  92  *
  93  * Note 2: virtual 0xfffe0000-0xffffffff is reserved for the vector table
  94  *         and cache flush area.
  95  */
  96 static struct map_desc standard_io_desc[] __initdata = {
  97         {       /* Devs */
  98                 .virtual        =  0xf2000000,
  99                 .pfn            = __phys_to_pfn(0x40000000),
 100                 .length         = 0x02000000,
 101                 .type           = MT_DEVICE
 102         }, {    /* Mem Ctl */
 103                 .virtual        =  0xf6000000,
 104                 .pfn            = __phys_to_pfn(0x48000000),
 105                 .length         = 0x00200000,
 106                 .type           = MT_DEVICE
 107         }, {    /* Camera */
 108                 .virtual        =  0xfa000000,
 109                 .pfn            = __phys_to_pfn(0x50000000),
 110                 .length         = 0x00100000,
 111                 .type           = MT_DEVICE
 112         }, {    /* IMem ctl */
 113                 .virtual        =  0xfe000000,
 114                 .pfn            = __phys_to_pfn(0x58000000),
 115                 .length         = 0x00100000,
 116                 .type           = MT_DEVICE
 117         }, {    /* UNCACHED_PHYS_0 */
 118                 .virtual        = 0xff000000,
 119                 .pfn            = __phys_to_pfn(0x00000000),
 120                 .length         = 0x00100000,
 121                 .type           = MT_DEVICE
 122         }
 123 };
 124
 125 void __init pxa_map_io(void)
 126 {
 127         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
 128         get_clk_frequency_khz(1);
 129 }