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
  28 #include <mach/pxa-regs.h>
  29 #include <mach/reset.h>
  30
  31 #include "generic.h"
  32
  33 void clear_reset_status(unsigned int mask)
  34 {
  35         if (cpu_is_pxa2xx())
  36                 pxa2xx_clear_reset_status(mask);
  37
  38         if (cpu_is_pxa3xx())
  39                 pxa3xx_clear_reset_status(mask);
  40 }
  41
  42 /*
  43  * Get the clock frequency as reflected by CCCR and the turbo flag.
  44  * We assume these values have been applied via a fcs.
  45  * If info is not 0 we also display the current settings.
  46  */
  47 unsigned int get_clk_frequency_khz(int info)
  48 {
  49         if (cpu_is_pxa21x() || cpu_is_pxa25x())
  50                 return pxa25x_get_clk_frequency_khz(info);
  51         else if (cpu_is_pxa27x())
  52                 return pxa27x_get_clk_frequency_khz(info);
  53         else
  54                 return pxa3xx_get_clk_frequency_khz(info);
  55 }
  56 EXPORT_SYMBOL(get_clk_frequency_khz);
  57
  58 /*
  59  * Return the current memory clock frequency in units of 10kHz
  60  */
  61 unsigned int get_memclk_frequency_10khz(void)
  62 {
  63         if (cpu_is_pxa21x() || cpu_is_pxa25x())
  64                 return pxa25x_get_memclk_frequency_10khz();
  65         else if (cpu_is_pxa27x())
  66                 return pxa27x_get_memclk_frequency_10khz();
  67         else
  68                 return pxa3xx_get_memclk_frequency_10khz();
  69 }
  70 EXPORT_SYMBOL(get_memclk_frequency_10khz);
  71
  72 /*
  73  * Intel PXA2xx internal register mapping.
  74  *
  75  * Note 1: not all PXA2xx variants implement all those addresses.
  76  *
  77  * Note 2: virtual 0xfffe0000-0xffffffff is reserved for the vector table
  78  *         and cache flush area.
  79  */
  80 static struct map_desc standard_io_desc[] __initdata = {
  81         {       /* Devs */
  82                 .virtual        =  0xf2000000,
  83                 .pfn            = __phys_to_pfn(0x40000000),
  84                 .length         = 0x02000000,
  85                 .type           = MT_DEVICE
  86         }, {    /* Mem Ctl */
  87                 .virtual        =  0xf6000000,
  88                 .pfn            = __phys_to_pfn(0x48000000),
  89                 .length         = 0x00200000,
  90                 .type           = MT_DEVICE
  91         }, {    /* USB host */
  92                 .virtual        =  0xf8000000,
  93                 .pfn            = __phys_to_pfn(0x4c000000),
  94                 .length         = 0x00100000,
  95                 .type           = MT_DEVICE
  96         }, {    /* Camera */
  97                 .virtual        =  0xfa000000,
  98                 .pfn            = __phys_to_pfn(0x50000000),
  99                 .length         = 0x00100000,
 100                 .type           = MT_DEVICE
 101         }, {    /* IMem ctl */
 102                 .virtual        =  0xfe000000,
 103                 .pfn            = __phys_to_pfn(0x58000000),
 104                 .length         = 0x00100000,
 105                 .type           = MT_DEVICE
 106         }, {    /* UNCACHED_PHYS_0 */
 107                 .virtual        = 0xff000000,
 108                 .pfn            = __phys_to_pfn(0x00000000),
 109                 .length         = 0x00100000,
 110                 .type           = MT_DEVICE
 111         }
 112 };
 113
 114 void __init pxa_map_io(void)
 115 {
 116         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
 117         get_clk_frequency_khz(1);
 118 }