Bellido Nicolas | 038c5b6 | 2005-06-20 18:51:05 +0100 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mach-aaec2000/core.c |
| 3 | * |
| 4 | * Code common to all AAEC-2000 machines |
| 5 | * |
| 6 | * Copyright (c) 2005 Nicolas Bellido Y Ortega |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
| 11 | */ |
| 12 | #include <linux/config.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/init.h> |
Bellido Nicolas | 4a91ca2 | 2005-10-28 16:51:42 +0100 | [diff] [blame] | 16 | #include <linux/device.h> |
Bellido Nicolas | 038c5b6 | 2005-06-20 18:51:05 +0100 | [diff] [blame] | 17 | #include <linux/list.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/timex.h> |
| 21 | #include <linux/signal.h> |
| 22 | |
| 23 | #include <asm/hardware.h> |
| 24 | #include <asm/irq.h> |
| 25 | |
Bellido Nicolas | 4a91ca2 | 2005-10-28 16:51:42 +0100 | [diff] [blame] | 26 | #include <asm/mach/flash.h> |
Bellido Nicolas | 038c5b6 | 2005-06-20 18:51:05 +0100 | [diff] [blame] | 27 | #include <asm/mach/irq.h> |
| 28 | #include <asm/mach/time.h> |
| 29 | #include <asm/mach/map.h> |
| 30 | |
| 31 | /* |
| 32 | * Common I/O mapping: |
| 33 | * |
| 34 | * Static virtual address mappings are as follow: |
| 35 | * |
| 36 | * 0xf8000000-0xf8001ffff: Devices connected to APB bus |
| 37 | * 0xf8002000-0xf8003ffff: Devices connected to AHB bus |
| 38 | * |
| 39 | * Below 0xe8000000 is reserved for vm allocation. |
| 40 | * |
| 41 | * The machine specific code must provide the extra mapping beside the |
| 42 | * default mapping provided here. |
| 43 | */ |
| 44 | static struct map_desc standard_io_desc[] __initdata = { |
Deepak Saxena | f70cd65 | 2005-10-28 15:18:56 +0100 | [diff] [blame] | 45 | { |
| 46 | .virtual = VIO_APB_BASE, |
| 47 | .physical = __phys_to_pfn(PIO_APB_BASE), |
| 48 | .length = IO_APB_LENGTH, |
| 49 | .type = MT_DEVICE |
| 50 | }, { |
| 51 | .virtual = VIO_AHB_BASE, |
| 52 | .physical = __phys_to_pfn(PIO_AHB_BASE), |
| 53 | .length = IO_AHB_LENGTH, |
| 54 | .type = MT_DEVICE |
| 55 | } |
Bellido Nicolas | 038c5b6 | 2005-06-20 18:51:05 +0100 | [diff] [blame] | 56 | }; |
| 57 | |
| 58 | void __init aaec2000_map_io(void) |
| 59 | { |
| 60 | iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc)); |
| 61 | } |
| 62 | |
| 63 | /* |
| 64 | * Interrupt handling routines |
| 65 | */ |
| 66 | static void aaec2000_int_ack(unsigned int irq) |
| 67 | { |
| 68 | IRQ_INTSR = 1 << irq; |
| 69 | } |
| 70 | |
| 71 | static void aaec2000_int_mask(unsigned int irq) |
| 72 | { |
| 73 | IRQ_INTENC |= (1 << irq); |
| 74 | } |
| 75 | |
| 76 | static void aaec2000_int_unmask(unsigned int irq) |
| 77 | { |
| 78 | IRQ_INTENS |= (1 << irq); |
| 79 | } |
| 80 | |
| 81 | static struct irqchip aaec2000_irq_chip = { |
| 82 | .ack = aaec2000_int_ack, |
| 83 | .mask = aaec2000_int_mask, |
| 84 | .unmask = aaec2000_int_unmask, |
| 85 | }; |
| 86 | |
| 87 | void __init aaec2000_init_irq(void) |
| 88 | { |
| 89 | unsigned int i; |
| 90 | |
| 91 | for (i = 0; i < NR_IRQS; i++) { |
| 92 | set_irq_handler(i, do_level_IRQ); |
| 93 | set_irq_chip(i, &aaec2000_irq_chip); |
| 94 | set_irq_flags(i, IRQF_VALID); |
| 95 | } |
| 96 | |
| 97 | /* Disable all interrupts */ |
| 98 | IRQ_INTENC = 0xffffffff; |
| 99 | |
| 100 | /* Clear any pending interrupts */ |
| 101 | IRQ_INTSR = IRQ_INTSR; |
| 102 | } |
| 103 | |
| 104 | /* |
| 105 | * Time keeping |
| 106 | */ |
| 107 | /* IRQs are disabled before entering here from do_gettimeofday() */ |
| 108 | static unsigned long aaec2000_gettimeoffset(void) |
| 109 | { |
| 110 | unsigned long ticks_to_match, elapsed, usec; |
| 111 | |
| 112 | /* Get ticks before next timer match */ |
| 113 | ticks_to_match = TIMER1_LOAD - TIMER1_VAL; |
| 114 | |
| 115 | /* We need elapsed ticks since last match */ |
| 116 | elapsed = LATCH - ticks_to_match; |
| 117 | |
| 118 | /* Now, convert them to usec */ |
| 119 | usec = (unsigned long)(elapsed * (tick_nsec / 1000))/LATCH; |
| 120 | |
| 121 | return usec; |
| 122 | } |
| 123 | |
| 124 | /* We enter here with IRQs enabled */ |
| 125 | static irqreturn_t |
| 126 | aaec2000_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) |
| 127 | { |
| 128 | /* TODO: Check timer accuracy */ |
| 129 | write_seqlock(&xtime_lock); |
| 130 | |
| 131 | timer_tick(regs); |
| 132 | TIMER1_CLEAR = 1; |
| 133 | |
| 134 | write_sequnlock(&xtime_lock); |
| 135 | |
| 136 | return IRQ_HANDLED; |
| 137 | } |
| 138 | |
| 139 | static struct irqaction aaec2000_timer_irq = { |
| 140 | .name = "AAEC-2000 Timer Tick", |
Russell King | 09b8b5f | 2005-06-26 17:06:36 +0100 | [diff] [blame] | 141 | .flags = SA_INTERRUPT | SA_TIMER, |
| 142 | .handler = aaec2000_timer_interrupt, |
Bellido Nicolas | 038c5b6 | 2005-06-20 18:51:05 +0100 | [diff] [blame] | 143 | }; |
| 144 | |
| 145 | static void __init aaec2000_timer_init(void) |
| 146 | { |
| 147 | /* Disable timer 1 */ |
| 148 | TIMER1_CTRL = 0; |
| 149 | |
| 150 | /* We have somehow to generate a 100Hz clock. |
| 151 | * We then use the 508KHz timer in periodic mode. |
| 152 | */ |
| 153 | TIMER1_LOAD = LATCH; |
| 154 | TIMER1_CLEAR = 1; /* Clear interrupt */ |
| 155 | |
| 156 | setup_irq(INT_TMR1_OFL, &aaec2000_timer_irq); |
| 157 | |
| 158 | TIMER1_CTRL = TIMER_CTRL_ENABLE | |
| 159 | TIMER_CTRL_PERIODIC | |
| 160 | TIMER_CTRL_CLKSEL_508K; |
| 161 | } |
| 162 | |
| 163 | struct sys_timer aaec2000_timer = { |
| 164 | .init = aaec2000_timer_init, |
| 165 | .offset = aaec2000_gettimeoffset, |
| 166 | }; |
| 167 | |
Bellido Nicolas | 4a91ca2 | 2005-10-28 16:51:42 +0100 | [diff] [blame] | 168 | static struct flash_platform_data aaec2000_flash_data = { |
| 169 | .map_name = "cfi_probe", |
| 170 | .width = 4, |
| 171 | }; |
| 172 | |
| 173 | static struct resource aaec2000_flash_resource = { |
| 174 | .start = AAEC_FLASH_BASE, |
| 175 | .end = AAEC_FLASH_BASE + AAEC_FLASH_SIZE, |
| 176 | .flags = IORESOURCE_MEM, |
| 177 | }; |
| 178 | |
| 179 | static struct platform_device aaec2000_flash_device = { |
| 180 | .name = "armflash", |
| 181 | .id = 0, |
| 182 | .dev = { |
| 183 | .platform_data = &aaec2000_flash_data, |
| 184 | }, |
| 185 | .num_resources = 1, |
| 186 | .resource = &aaec2000_flash_resource, |
| 187 | }; |
| 188 | |
| 189 | static int __init aaec2000_init(void) |
| 190 | { |
| 191 | platform_device_register(&aaec2000_flash_device); |
| 192 | |
| 193 | return 0; |
| 194 | }; |
| 195 | arch_initcall(aaec2000_init); |
| 196 | |