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 <asm/hardware.h>
  24 #include <asm/system.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/mach/map.h>
  27
  28 #include <asm/arch/pxa-regs.h>
  29
  30 #include "generic.h"
  31
  32 /*
  33  * Get the clock frequency as reflected by CCCR and the turbo flag.
  34  * We assume these values have been applied via a fcs.
  35  * If info is not 0 we also display the current settings.
  36  */
  37 unsigned int get_clk_frequency_khz(int info)
  38 {
  39         if (cpu_is_pxa21x() || cpu_is_pxa25x())
  40                 return pxa25x_get_clk_frequency_khz(info);
  41         else if (cpu_is_pxa27x())
  42                 return pxa27x_get_clk_frequency_khz(info);
  43         else
  44                 return pxa3xx_get_clk_frequency_khz(info);
  45 }
  46 EXPORT_SYMBOL(get_clk_frequency_khz);
  47
  48 /*
  49  * Return the current memory clock frequency in units of 10kHz
  50  */
  51 unsigned int get_memclk_frequency_10khz(void)
  52 {
  53         if (cpu_is_pxa21x() || cpu_is_pxa25x())
  54                 return pxa25x_get_memclk_frequency_10khz();
  55         else if (cpu_is_pxa27x())
  56                 return pxa27x_get_memclk_frequency_10khz();
  57         else
  58                 return pxa3xx_get_memclk_frequency_10khz();
  59 }
  60 EXPORT_SYMBOL(get_memclk_frequency_10khz);
  61
  62 /*
  63  * Routine to safely enable or disable a clock in the CKEN
  64  */
  65 void __pxa_set_cken(int clock, int enable)
  66 {
  67         unsigned long flags;
  68         local_irq_save(flags);
  69
  70         if (enable)
  71                 CKEN |= (1 << clock);
  72         else
  73                 CKEN &= ~(1 << clock);
  74
  75         local_irq_restore(flags);
  76 }
  77 EXPORT_SYMBOL(__pxa_set_cken);
  78
  79 /*
  80  * Intel PXA2xx internal register mapping.
  81  *
  82  * Note 1: not all PXA2xx variants implement all those addresses.
  83  *
  84  * Note 2: virtual 0xfffe0000-0xffffffff is reserved for the vector table
  85  *         and cache flush area.
  86  */
  87 static struct map_desc standard_io_desc[] __initdata = {
  88         {       /* Devs */
  89                 .virtual        =  0xf2000000,
  90                 .pfn            = __phys_to_pfn(0x40000000),
  91                 .length         = 0x02000000,
  92                 .type           = MT_DEVICE
  93         }, {    /* LCD */
  94                 .virtual        =  0xf4000000,
  95                 .pfn            = __phys_to_pfn(0x44000000),
  96                 .length         = 0x00100000,
  97                 .type           = MT_DEVICE
  98         }, {    /* Mem Ctl */
  99                 .virtual        =  0xf6000000,
 100                 .pfn            = __phys_to_pfn(0x48000000),
 101                 .length         = 0x00200000,
 102                 .type           = MT_DEVICE
 103         }, {    /* USB host */
 104                 .virtual        =  0xf8000000,
 105                 .pfn            = __phys_to_pfn(0x4c000000),
 106                 .length         = 0x00100000,
 107                 .type           = MT_DEVICE
 108         }, {    /* Camera */
 109                 .virtual        =  0xfa000000,
 110                 .pfn            = __phys_to_pfn(0x50000000),
 111                 .length         = 0x00100000,
 112                 .type           = MT_DEVICE
 113         }, {    /* IMem ctl */
 114                 .virtual        =  0xfe000000,
 115                 .pfn            = __phys_to_pfn(0x58000000),
 116                 .length         = 0x00100000,
 117                 .type           = MT_DEVICE
 118         }, {    /* UNCACHED_PHYS_0 */
 119                 .virtual        = 0xff000000,
 120                 .pfn            = __phys_to_pfn(0x00000000),
 121                 .length         = 0x00100000,
 122                 .type           = MT_DEVICE
 123         }
 124 };
 125
 126 void __init pxa_map_io(void)
 127 {
 128         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
 129         get_clk_frequency_khz(1);
 130 }