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 #include <linux/delay.h>
  23 #include <linux/ioport.h>
  24 #include <linux/pm.h>
  25 #include <linux/string.h>
  26
  27 #include <asm/hardware.h>
  28 #include <asm/irq.h>
  29 #include <asm/system.h>
  30 #include <asm/pgtable.h>
  31 #include <asm/mach/map.h>
  32
  33 #include <asm/arch/pxa-regs.h>
  34 #include <asm/arch/gpio.h>
  35
  36 #include "generic.h"
  37
  38 /*
  39  * Get the clock frequency as reflected by CCCR and the turbo flag.
  40  * We assume these values have been applied via a fcs.
  41  * If info is not 0 we also display the current settings.
  42  */
  43 unsigned int get_clk_frequency_khz(int info)
  44 {
  45         if (cpu_is_pxa21x() || cpu_is_pxa25x())
  46                 return pxa25x_get_clk_frequency_khz(info);
  47         else if (cpu_is_pxa27x())
  48                 return pxa27x_get_clk_frequency_khz(info);
  49         else
  50                 return pxa3xx_get_clk_frequency_khz(info);
  51 }
  52 EXPORT_SYMBOL(get_clk_frequency_khz);
  53
  54 /*
  55  * Return the current memory clock frequency in units of 10kHz
  56  */
  57 unsigned int get_memclk_frequency_10khz(void)
  58 {
  59         if (cpu_is_pxa21x() || cpu_is_pxa25x())
  60                 return pxa25x_get_memclk_frequency_10khz();
  61         else if (cpu_is_pxa27x())
  62                 return pxa27x_get_memclk_frequency_10khz();
  63         else
  64                 return pxa3xx_get_memclk_frequency_10khz();
  65 }
  66 EXPORT_SYMBOL(get_memclk_frequency_10khz);
  67
  68 /*
  69  * Handy function to set GPIO alternate functions
  70  */
  71 int pxa_last_gpio;
  72
  73 int pxa_gpio_mode(int gpio_mode)
  74 {
  75         unsigned long flags;
  76         int gpio = gpio_mode & GPIO_MD_MASK_NR;
  77         int fn = (gpio_mode & GPIO_MD_MASK_FN) >> 8;
  78         int gafr;
  79
  80         if (gpio > pxa_last_gpio)
  81                 return -EINVAL;
  82
  83         local_irq_save(flags);
  84         if (gpio_mode & GPIO_DFLT_LOW)
  85                 GPCR(gpio) = GPIO_bit(gpio);
  86         else if (gpio_mode & GPIO_DFLT_HIGH)
  87                 GPSR(gpio) = GPIO_bit(gpio);
  88         if (gpio_mode & GPIO_MD_MASK_DIR)
  89                 GPDR(gpio) |= GPIO_bit(gpio);
  90         else
  91                 GPDR(gpio) &= ~GPIO_bit(gpio);
  92         gafr = GAFR(gpio) & ~(0x3 << (((gpio) & 0xf)*2));
  93         GAFR(gpio) = gafr |  (fn  << (((gpio) & 0xf)*2));
  94         local_irq_restore(flags);
  95
  96         return 0;
  97 }
  98
  99 EXPORT_SYMBOL(pxa_gpio_mode);
 100
 101 int gpio_direction_input(unsigned gpio)
 102 {
 103         unsigned long flags;
 104         u32 mask;
 105
 106         if (gpio > pxa_last_gpio)
 107                 return -EINVAL;
 108
 109         mask = GPIO_bit(gpio);
 110         local_irq_save(flags);
 111         GPDR(gpio) &= ~mask;
 112         local_irq_restore(flags);
 113
 114         return 0;
 115 }
 116 EXPORT_SYMBOL(gpio_direction_input);
 117
 118 int gpio_direction_output(unsigned gpio, int value)
 119 {
 120         unsigned long flags;
 121         u32 mask;
 122
 123         if (gpio > pxa_last_gpio)
 124                 return -EINVAL;
 125
 126         mask = GPIO_bit(gpio);
 127         local_irq_save(flags);
 128         if (value)
 129                 GPSR(gpio) = mask;
 130         else
 131                 GPCR(gpio) = mask;
 132         GPDR(gpio) |= mask;
 133         local_irq_restore(flags);
 134
 135         return 0;
 136 }
 137 EXPORT_SYMBOL(gpio_direction_output);
 138
 139 /*
 140  * Return GPIO level
 141  */
 142 int pxa_gpio_get_value(unsigned gpio)
 143 {
 144         return __gpio_get_value(gpio);
 145 }
 146
 147 EXPORT_SYMBOL(pxa_gpio_get_value);
 148
 149 /*
 150  * Set output GPIO level
 151  */
 152 void pxa_gpio_set_value(unsigned gpio, int value)
 153 {
 154         __gpio_set_value(gpio, value);
 155 }
 156
 157 EXPORT_SYMBOL(pxa_gpio_set_value);
 158
 159 /*
 160  * Routine to safely enable or disable a clock in the CKEN
 161  */
 162 void __pxa_set_cken(int clock, int enable)
 163 {
 164         unsigned long flags;
 165         local_irq_save(flags);
 166
 167         if (enable)
 168                 CKEN |= (1 << clock);
 169         else
 170                 CKEN &= ~(1 << clock);
 171
 172         local_irq_restore(flags);
 173 }
 174
 175 EXPORT_SYMBOL(__pxa_set_cken);
 176
 177 /*
 178  * Intel PXA2xx internal register mapping.
 179  *
 180  * Note 1: not all PXA2xx variants implement all those addresses.
 181  *
 182  * Note 2: virtual 0xfffe0000-0xffffffff is reserved for the vector table
 183  *         and cache flush area.
 184  */
 185 static struct map_desc standard_io_desc[] __initdata = {
 186         {       /* Devs */
 187                 .virtual        =  0xf2000000,
 188                 .pfn            = __phys_to_pfn(0x40000000),
 189                 .length         = 0x02000000,
 190                 .type           = MT_DEVICE
 191         }, {    /* LCD */
 192                 .virtual        =  0xf4000000,
 193                 .pfn            = __phys_to_pfn(0x44000000),
 194                 .length         = 0x00100000,
 195                 .type           = MT_DEVICE
 196         }, {    /* Mem Ctl */
 197                 .virtual        =  0xf6000000,
 198                 .pfn            = __phys_to_pfn(0x48000000),
 199                 .length         = 0x00100000,
 200                 .type           = MT_DEVICE
 201         }, {    /* USB host */
 202                 .virtual        =  0xf8000000,
 203                 .pfn            = __phys_to_pfn(0x4c000000),
 204                 .length         = 0x00100000,
 205                 .type           = MT_DEVICE
 206         }, {    /* Camera */
 207                 .virtual        =  0xfa000000,
 208                 .pfn            = __phys_to_pfn(0x50000000),
 209                 .length         = 0x00100000,
 210                 .type           = MT_DEVICE
 211         }, {    /* IMem ctl */
 212                 .virtual        =  0xfe000000,
 213                 .pfn            = __phys_to_pfn(0x58000000),
 214                 .length         = 0x00100000,
 215                 .type           = MT_DEVICE
 216         }, {    /* UNCACHED_PHYS_0 */
 217                 .virtual        = 0xff000000,
 218                 .pfn            = __phys_to_pfn(0x00000000),
 219                 .length         = 0x00100000,
 220                 .type           = MT_DEVICE
 221         }
 222 };
 223
 224 void __init pxa_map_io(void)
 225 {
 226         iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
 227         get_clk_frequency_khz(1);
 228 }