arch/arm/mach-pxa/generic.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/arch/arm/mach-pxa/generic.c
   4  *
   5  *  Author:     Nicolas Pitre
   6  *  Created:    Jun 15, 2001
   7  *  Copyright:  MontaVista Software Inc.
   8  *
   9  * Code common to all PXA machines.
  10  *
  11  * Since this file should be linked before any other machine specific file,
  12  * the __initcall() here will be executed first.  This serves as default
  13  * initialization stuff for PXA machines which can be overridden later if
  14  * need be.
  15  */
  16 #include <linux/gpio.h>
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20
  21 #include <mach/hardware.h>
  22 #include <asm/mach/map.h>
  23 #include <asm/mach-types.h>
  24
  25 #include <mach/irqs.h>
  26 #include <mach/reset.h>
  27 #include <mach/smemc.h>
  28 #include <mach/pxa3xx-regs.h>
  29
  30 #include "generic.h"
  31 #include <clocksource/pxa.h>
  32
  33 void clear_reset_status(unsigned int mask)
  34 {
  35         if (cpu_is_pxa2xx())
  36                 pxa2xx_clear_reset_status(mask);
  37         else {
  38                 /* RESET_STATUS_* has a 1:1 mapping with ARSR */
  39                 ARSR = mask;
  40         }
  41 }
  42
  43 /*
  44  * For non device-tree builds, keep legacy timer init
  45  */
  46 void __init pxa_timer_init(void)
  47 {
  48         if (cpu_is_pxa25x())
  49                 pxa25x_clocks_init();
  50         if (cpu_is_pxa27x())
  51                 pxa27x_clocks_init();
  52         if (cpu_is_pxa3xx())
  53                 pxa3xx_clocks_init();
  54         pxa_timer_nodt_init(IRQ_OST0, io_p2v(0x40a00000));
  55 }
  56
  57 /*
  58  * Get the clock frequency as reflected by CCCR and the turbo flag.
  59  * We assume these values have been applied via a fcs.
  60  * If info is not 0 we also display the current settings.
  61  */
  62 unsigned int get_clk_frequency_khz(int info)
  63 {
  64         if (cpu_is_pxa25x())
  65                 return pxa25x_get_clk_frequency_khz(info);
  66         else if (cpu_is_pxa27x())
  67                 return pxa27x_get_clk_frequency_khz(info);
  68         return 0;
  69 }
  70 EXPORT_SYMBOL(get_clk_frequency_khz);
  71
  72 /*
  73  * Intel PXA2xx internal register mapping.
  74  *
  75  * Note: virtual 0xfffe0000-0xffffffff is reserved for the vector table
  76  *       and cache flush area.
  77  */
  78 static struct map_desc common_io_desc[] __initdata = {
  79         {       /* Devs */
  80                 .virtual        = (unsigned long)PERIPH_VIRT,
  81                 .pfn            = __phys_to_pfn(PERIPH_PHYS),
  82                 .length         = PERIPH_SIZE,
  83                 .type           = MT_DEVICE
  84         }
  85 };
  86
  87 void __init pxa_map_io(void)
  88 {
  89         debug_ll_io_init();
  90         iotable_init(ARRAY_AND_SIZE(common_io_desc));
  91 }