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 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 = 0xf2000000, 94 .pfn = __phys_to_pfn(0x40000000), 95 .length = 0x02000000, 96 .type = MT_DEVICE 97 }, { /* UNCACHED_PHYS_0 */ 98 .virtual = 0xff000000, 99 .pfn = __phys_to_pfn(0x00000000), 100 .length = 0x00100000, 101 .type = MT_DEVICE 102 } 103 }; 104 105 void __init pxa_map_io(void) 106 { 107 iotable_init(ARRAY_AND_SIZE(common_io_desc)); 108 } 109