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/system.h>
  26 #include <asm/mach/map.h>
  27 #include <asm/mach-types.h>
  28
  29 #include <mach/reset.h>
  30 #include <mach/smemc.h>
  31 #include <mach/pxa3xx-regs.h>
  32
  33 #include "generic.h"
  34
  35 void clear_reset_status(unsigned int mask)
  36 {
  37         if (cpu_is_pxa2xx())
  38                 pxa2xx_clear_reset_status(mask);
  39         else {
  40                 /* RESET_STATUS_* has a 1:1 mapping with ARSR */
  41                 ARSR = mask;
  42         }
  43 }
  44
  45 unsigned long get_clock_tick_rate(void)
  46 {
  47         unsigned long clock_tick_rate;
  48
  49         if (cpu_is_pxa25x())
  50                 clock_tick_rate = 3686400;
  51         else if (machine_is_mainstone())
  52                 clock_tick_rate = 3249600;
  53         else
  54                 clock_tick_rate = 3250000;
  55
  56         return clock_tick_rate;
  57 }
  58 EXPORT_SYMBOL(get_clock_tick_rate);
  59
  60 /*
  61  * Get the clock frequency as reflected by CCCR and the turbo flag.
  62  * We assume these values have been applied via a fcs.
  63  * If info is not 0 we also display the current settings.
  64  */
  65 unsigned int get_clk_frequency_khz(int info)
  66 {
  67         if (cpu_is_pxa25x())
  68                 return pxa25x_get_clk_frequency_khz(info);
  69         else if (cpu_is_pxa27x())
  70                 return pxa27x_get_clk_frequency_khz(info);
  71         return 0;
  72 }
  73 EXPORT_SYMBOL(get_clk_frequency_khz);
  74
  75 /*
  76  * Intel PXA2xx internal register mapping.
  77  *
  78  * Note: virtual 0xfffe0000-0xffffffff is reserved for the vector table
  79  *       and cache flush area.
  80  */
  81 static struct map_desc common_io_desc[] __initdata = {
  82         {       /* Devs */
  83                 .virtual        =  0xf2000000,
  84                 .pfn            = __phys_to_pfn(0x40000000),
  85                 .length         = 0x02000000,
  86                 .type           = MT_DEVICE
  87         }, {    /* UNCACHED_PHYS_0 */
  88                 .virtual        = 0xff000000,
  89                 .pfn            = __phys_to_pfn(0x00000000),
  90                 .length         = 0x00100000,
  91                 .type           = MT_DEVICE
  92         }
  93 };
  94
  95 void __init pxa_map_io(void)
  96 {
  97         iotable_init(ARRAY_AND_SIZE(common_io_desc));
  98 }