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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 | /* * linux/arch/arm/mach-ebsa110/core.c * * Copyright (C) 1998-2001 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Extra MM routines for the EBSA-110 architecture */ #include <linux/kernel.h> #include <linux/mm.h> #include <linux/interrupt.h> #include <linux/serial_8250.h> #include <linux/init.h> #include <asm/hardware.h> #include <asm/irq.h> #include <asm/io.h> #include <asm/setup.h> #include <asm/mach-types.h> #include <asm/pgtable.h> #include <asm/page.h> #include <asm/system.h> #include <asm/mach/arch.h> #include <asm/mach/irq.h> #include <asm/mach/map.h> #include <asm/mach/time.h> #define IRQ_MASK 0xfe000000 /* read */ #define IRQ_MSET 0xfe000000 /* write */ #define IRQ_STAT 0xff000000 /* read */ #define IRQ_MCLR 0xff000000 /* write */ static void ebsa110_mask_irq(unsigned int irq) { __raw_writeb(1 << irq, IRQ_MCLR); } static void ebsa110_unmask_irq(unsigned int irq) { __raw_writeb(1 << irq, IRQ_MSET); } static struct irq_chip ebsa110_irq_chip = { .ack = ebsa110_mask_irq, .mask = ebsa110_mask_irq, .unmask = ebsa110_unmask_irq, }; static void __init ebsa110_init_irq(void) { unsigned long flags; unsigned int irq; local_irq_save(flags); __raw_writeb(0xff, IRQ_MCLR); __raw_writeb(0x55, IRQ_MSET); __raw_writeb(0x00, IRQ_MSET); if (__raw_readb(IRQ_MASK) != 0x55) while (1); __raw_writeb(0xff, IRQ_MCLR); /* clear all interrupt enables */ local_irq_restore(flags); for (irq = 0; irq < NR_IRQS; irq++) { set_irq_chip(irq, &ebsa110_irq_chip); set_irq_handler(irq, handle_level_irq); set_irq_flags(irq, IRQF_VALID | IRQF_PROBE); } } static struct map_desc ebsa110_io_desc[] __initdata = { /* * sparse external-decode ISAIO space */ { /* IRQ_STAT/IRQ_MCLR */ .virtual = IRQ_STAT, .pfn = __phys_to_pfn(TRICK4_PHYS), .length = PGDIR_SIZE, .type = MT_DEVICE }, { /* IRQ_MASK/IRQ_MSET */ .virtual = IRQ_MASK, .pfn = __phys_to_pfn(TRICK3_PHYS), .length = PGDIR_SIZE, .type = MT_DEVICE }, { /* SOFT_BASE */ .virtual = SOFT_BASE, .pfn = __phys_to_pfn(TRICK1_PHYS), .length = PGDIR_SIZE, .type = MT_DEVICE }, { /* PIT_BASE */ .virtual = PIT_BASE, .pfn = __phys_to_pfn(TRICK0_PHYS), .length = PGDIR_SIZE, .type = MT_DEVICE }, /* * self-decode ISAIO space */ { .virtual = ISAIO_BASE, .pfn = __phys_to_pfn(ISAIO_PHYS), .length = ISAIO_SIZE, .type = MT_DEVICE }, { .virtual = ISAMEM_BASE, .pfn = __phys_to_pfn(ISAMEM_PHYS), .length = ISAMEM_SIZE, .type = MT_DEVICE } }; static void __init ebsa110_map_io(void) { iotable_init(ebsa110_io_desc, ARRAY_SIZE(ebsa110_io_desc)); } #define PIT_CTRL (PIT_BASE + 0x0d) #define PIT_T2 (PIT_BASE + 0x09) #define PIT_T1 (PIT_BASE + 0x05) #define PIT_T0 (PIT_BASE + 0x01) /* * This is the rate at which your MCLK signal toggles (in Hz) * This was measured on a 10 digit frequency counter sampling * over 1 second. */ #define MCLK 47894000 /* * This is the rate at which the PIT timers get clocked */ #define CLKBY7 (MCLK / 7) /* * This is the counter value. We tick at 200Hz on this platform. */ #define COUNT ((CLKBY7 + (HZ / 2)) / HZ) /* * Get the time offset from the system PIT. Note that if we have missed an * interrupt, then the PIT counter will roll over (ie, be negative). * This actually works out to be convenient. */ static unsigned long ebsa110_gettimeoffset(void) { unsigned long offset, count; __raw_writeb(0x40, PIT_CTRL); count = __raw_readb(PIT_T1); count |= __raw_readb(PIT_T1) << 8; /* * If count > COUNT, make the number negative. */ if (count > COUNT) count |= 0xffff0000; offset = COUNT; offset -= count; /* * `offset' is in units of timer counts. Convert * offset to units of microseconds. */ offset = offset * (1000000 / HZ) / COUNT; return offset; } static irqreturn_t ebsa110_timer_interrupt(int irq, void *dev_id) { u32 count; write_seqlock(&xtime_lock); /* latch and read timer 1 */ __raw_writeb(0x40, PIT_CTRL); count = __raw_readb(PIT_T1); count |= __raw_readb(PIT_T1) << 8; count += COUNT; __raw_writeb(count & 0xff, PIT_T1); __raw_writeb(count >> 8, PIT_T1); timer_tick(); write_sequnlock(&xtime_lock); return IRQ_HANDLED; } static struct irqaction ebsa110_timer_irq = { .name = "EBSA110 Timer Tick", .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, .handler = ebsa110_timer_interrupt, }; /* * Set up timer interrupt. */ static void __init ebsa110_timer_init(void) { /* * Timer 1, mode 2, LSB/MSB */ __raw_writeb(0x70, PIT_CTRL); __raw_writeb(COUNT & 0xff, PIT_T1); __raw_writeb(COUNT >> 8, PIT_T1); setup_irq(IRQ_EBSA110_TIMER0, &ebsa110_timer_irq); } static struct sys_timer ebsa110_timer = { .init = ebsa110_timer_init, .offset = ebsa110_gettimeoffset, }; static struct plat_serial8250_port serial_platform_data[] = { { .iobase = 0x3f8, .irq = 1, .uartclk = 1843200, .regshift = 0, .iotype = UPIO_PORT, .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST, }, { .iobase = 0x2f8, .irq = 2, .uartclk = 1843200, .regshift = 0, .iotype = UPIO_PORT, .flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST, }, { }, }; static struct platform_device serial_device = { .name = "serial8250", .id = PLAT8250_DEV_PLATFORM, .dev = { .platform_data = serial_platform_data, }, }; static struct resource am79c961_resources[] = { { .start = 0x220, .end = 0x238, .flags = IORESOURCE_IO, }, { .start = IRQ_EBSA110_ETHERNET, .end = IRQ_EBSA110_ETHERNET, .flags = IORESOURCE_IRQ, }, }; static struct platform_device am79c961_device = { .name = "am79c961", .id = -1, .num_resources = ARRAY_SIZE(am79c961_resources), .resource = am79c961_resources, }; static struct platform_device *ebsa110_devices[] = { &serial_device, &am79c961_device, }; static int __init ebsa110_init(void) { return platform_add_devices(ebsa110_devices, ARRAY_SIZE(ebsa110_devices)); } arch_initcall(ebsa110_init); MACHINE_START(EBSA110, "EBSA110") /* Maintainer: Russell King */ .phys_io = 0xe0000000, .io_pg_offst = ((0xe0000000) >> 18) & 0xfffc, .boot_params = 0x00000400, .reserve_lp0 = 1, .reserve_lp2 = 1, .soft_reboot = 1, .map_io = ebsa110_map_io, .init_irq = ebsa110_init_irq, .timer = &ebsa110_timer, MACHINE_END |