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 #include <asm/arch/pxa2xx-regs.h> /* for __pxa_set_cken */
  30
  31 #include "generic.h"
  32
  33 /*
  34  * Get the clock frequency as reflected by CCCR and the turbo flag.
  35  * We assume these values have been applied via a fcs.
  36  * If info is not 0 we also display the current settings.
  37  */
  38 unsigned int get_clk_frequency_khz(int info)
  39 {
  40         if (cpu_is_pxa21x() || cpu_is_pxa25x())
  41                 return pxa25x_get_clk_frequency_khz(info);
  42         else if (cpu_is_pxa27x())
  43                 return pxa27x_get_clk_frequency_khz(info);
  44         else
  45                 return pxa3xx_get_clk_frequency_khz(info);
  46 }
  47 EXPORT_SYMBOL(get_clk_frequency_khz);
  48
  49 /*
  50  * Return the current memory clock frequency in units of 10kHz
  51  */
  52 unsigned int get_memclk_frequency_10khz(void)
  53 {
  54         if (cpu_is_pxa21x() || cpu_is_pxa25x())
  55                 return pxa25x_get_memclk_frequency_10khz();
  56         else if (cpu_is_pxa27x())
  57                 return pxa27x_get_memclk_frequency_10khz();
  58         else
  59                 return pxa3xx_get_memclk_frequency_10khz();
  60 }
  61 EXPORT_SYMBOL(get_memclk_frequency_10khz);
  62
  63 /*
  64  * Routine to safely enable or disable a clock in the CKEN
  65  */
  66 void __pxa_set_cken(int clock, int enable)
  67 {
  68         unsigned long flags;
  69         local_irq_save(flags);
  70
  71         if (enable)
  72                 CKEN |= (1 << clock);
  73         else
  74                 CKEN &= ~(1 << clock);
  75
  76         local_irq_restore(flags);
  77 }
  78 EXPORT_SYMBOL(__pxa_set_cken);
  79
  80 /*
  81  * Intel PXA2xx internal register mapping.
  82  *
  83  * Note 1: not all PXA2xx variants implement all those addresses.
  84  *
  85  * Note 2: virtual 0xfffe0000-0xffffffff is reserved for the vector table
  86  *         and cache flush area.
  87  */
  88 static struct map_desc standard_io_desc[] __initdata = {
  89         {       /* Devs */
  90                 .virtual        =  0xf2000000,
  91                 .pfn            = __phys_to_pfn(0x40000000),
  92                 .length         = 0x02000000,
  93                 .type           = MT_DEVICE
  94         }, {    /* Mem Ctl */
  95                 .virtual        =  0xf6000000,
  96                 .pfn            = __phys_to_pfn(0x48000000),
  97                 .length         = 0x00200000,
  98                 .type           = MT_DEVICE
  99         }, {    /* USB host */
 100                 .virtual        =  0xf8000000,
 101                 .pfn            = __phys_to_pfn(0x4c000000),
 102                 .length         = 0x00100000,
 103                 .type           = MT_DEVICE
 104         }, {    /* Camera */
 105                 .virtual        =  0xfa000000,
 106                 .pfn            = __phys_to_pfn(0x50000000),
 107                 .length         = 0x00100000,
 108                 .type           = MT_DEVICE
 109         }, {    /* IMem ctl */
 110                 .virtual        =  0xfe000000,
 111                 .pfn            = __phys_to_pfn(0x58000000),
 112                 .length         = 0x00100000,
 113                 .type           = MT_DEVICE
 114         }, {    /* UNCACHED_PHYS_0 */
 115                 .virtual        = 0xff000000,
 116                 .pfn            = __phys_to_pfn(0x00000000),
 117                 .length         = 0x00100000,
 118                 .type           = MT_DEVICE
 119         }
 120 };
 121
 122 void __init pxa_map_io(void)
 123 {
 124         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
 125         get_clk_frequency_khz(1);
 126 }