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/mach/map.h>
  26 #include <asm/mach-types.h>
  27
  28 #include <mach/irqs.h>
  29 #include <mach/reset.h>
  30 #include <mach/smemc.h>
  31 #include <mach/pxa3xx-regs.h>
  32
  33 #include "generic.h"
  34 #include <clocksource/pxa.h>
  35
  36 void clear_reset_status(unsigned int mask)
  37 {
  38         if (cpu_is_pxa2xx())
  39                 pxa2xx_clear_reset_status(mask);
  40         else {
  41                 /* RESET_STATUS_* has a 1:1 mapping with ARSR */
  42                 ARSR = mask;
  43         }
  44 }
  45
  46 unsigned long get_clock_tick_rate(void)
  47 {
  48         unsigned long clock_tick_rate;
  49
  50         if (cpu_is_pxa25x())
  51                 clock_tick_rate = 3686400;
  52         else if (machine_is_mainstone())
  53                 clock_tick_rate = 3249600;
  54         else
  55                 clock_tick_rate = 3250000;
  56
  57         return clock_tick_rate;
  58 }
  59 EXPORT_SYMBOL(get_clock_tick_rate);
  60
  61 /*
  62  * For non device-tree builds, keep legacy timer init
  63  */
  64 void __init pxa_timer_init(void)
  65 {
  66         pxa_timer_nodt_init(IRQ_OST0, io_p2v(0x40a00000),
  67                             get_clock_tick_rate());
  68 }
  69
  70 /*
  71  * Get the clock frequency as reflected by CCCR and the turbo flag.
  72  * We assume these values have been applied via a fcs.
  73  * If info is not 0 we also display the current settings.
  74  */
  75 unsigned int get_clk_frequency_khz(int info)
  76 {
  77         if (cpu_is_pxa25x())
  78                 return pxa25x_get_clk_frequency_khz(info);
  79         else if (cpu_is_pxa27x())
  80                 return pxa27x_get_clk_frequency_khz(info);
  81         return 0;
  82 }
  83 EXPORT_SYMBOL(get_clk_frequency_khz);
  84
  85 /*
  86  * Intel PXA2xx internal register mapping.
  87  *
  88  * Note: virtual 0xfffe0000-0xffffffff is reserved for the vector table
  89  *       and cache flush area.
  90  */
  91 static struct map_desc common_io_desc[] __initdata = {
  92         {       /* Devs */
  93                 .virtual        = (unsigned long)PERIPH_VIRT,
  94                 .pfn            = __phys_to_pfn(PERIPH_PHYS),
  95                 .length         = PERIPH_SIZE,
  96                 .type           = MT_DEVICE
  97         }
  98 };
  99
 100 void __init pxa_map_io(void)
 101 {
 102         debug_ll_io_init();
 103         iotable_init(ARRAY_AND_SIZE(common_io_desc));
 104 }