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 <mach/hardware.h> 24 #include <asm/system.h> 25 #include <asm/pgtable.h> 26 #include <asm/mach/map.h> 27 #include <asm/mach-types.h> 28 29 #include <mach/reset.h> 30 #include <mach/gpio.h> 31 32 #include "generic.h" 33 34 void clear_reset_status(unsigned int mask) 35 { 36 if (cpu_is_pxa2xx()) 37 pxa2xx_clear_reset_status(mask); 38 39 if (cpu_is_pxa3xx()) 40 pxa3xx_clear_reset_status(mask); 41 } 42 43 unsigned long get_clock_tick_rate(void) 44 { 45 unsigned long clock_tick_rate; 46 47 if (cpu_is_pxa25x()) 48 clock_tick_rate = 3686400; 49 else if (machine_is_mainstone()) 50 clock_tick_rate = 3249600; 51 else 52 clock_tick_rate = 3250000; 53 54 return clock_tick_rate; 55 } 56 EXPORT_SYMBOL(get_clock_tick_rate); 57 58 /* 59 * Get the clock frequency as reflected by CCCR and the turbo flag. 60 * We assume these values have been applied via a fcs. 61 * If info is not 0 we also display the current settings. 62 */ 63 unsigned int get_clk_frequency_khz(int info) 64 { 65 if (cpu_is_pxa25x()) 66 return pxa25x_get_clk_frequency_khz(info); 67 else if (cpu_is_pxa27x()) 68 return pxa27x_get_clk_frequency_khz(info); 69 else 70 return pxa3xx_get_clk_frequency_khz(info); 71 } 72 EXPORT_SYMBOL(get_clk_frequency_khz); 73 74 /* 75 * Return the current memory clock frequency in units of 10kHz 76 */ 77 unsigned int get_memclk_frequency_10khz(void) 78 { 79 if (cpu_is_pxa25x()) 80 return pxa25x_get_memclk_frequency_10khz(); 81 else if (cpu_is_pxa27x()) 82 return pxa27x_get_memclk_frequency_10khz(); 83 else 84 return pxa3xx_get_memclk_frequency_10khz(); 85 } 86 EXPORT_SYMBOL(get_memclk_frequency_10khz); 87 88 /* 89 * Intel PXA2xx internal register mapping. 90 * 91 * Note 1: not all PXA2xx variants implement all those addresses. 92 * 93 * Note 2: virtual 0xfffe0000-0xffffffff is reserved for the vector table 94 * and cache flush area. 95 */ 96 static struct map_desc standard_io_desc[] __initdata = { 97 { /* Devs */ 98 .virtual = 0xf2000000, 99 .pfn = __phys_to_pfn(0x40000000), 100 .length = 0x02000000, 101 .type = MT_DEVICE 102 }, { /* Mem Ctl */ 103 .virtual = 0xf6000000, 104 .pfn = __phys_to_pfn(0x48000000), 105 .length = 0x00200000, 106 .type = MT_DEVICE 107 }, { /* Camera */ 108 .virtual = 0xfa000000, 109 .pfn = __phys_to_pfn(0x50000000), 110 .length = 0x00100000, 111 .type = MT_DEVICE 112 }, { /* IMem ctl */ 113 .virtual = 0xfe000000, 114 .pfn = __phys_to_pfn(0x58000000), 115 .length = 0x00100000, 116 .type = MT_DEVICE 117 }, { /* UNCACHED_PHYS_0 */ 118 .virtual = 0xff000000, 119 .pfn = __phys_to_pfn(0x00000000), 120 .length = 0x00100000, 121 .type = MT_DEVICE 122 } 123 }; 124 125 void __init pxa_map_io(void) 126 { 127 iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc)); 128 get_clk_frequency_khz(1); 129 } 130