release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-at91/at91rm9200.c

   1 /*
   2  * arch/arm/mach-at91/at91rm9200.c
   3  *
   4  *  Copyright (C) 2005 SAN People
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  */
  12
  13 #include <linux/module.h>
  14
  15 #include <asm/irq.h>
  16 #include <asm/mach/arch.h>
  17 #include <asm/mach/map.h>
  18 #include <mach/at91rm9200.h>
  19 #include <mach/at91_pmc.h>
  20 #include <mach/at91_st.h>
  21
  22 #include "generic.h"
  23 #include "clock.h"
  24
  25 static struct map_desc at91rm9200_io_desc[] __initdata = {
  26         {
  27                 .virtual        = AT91_VA_BASE_SYS,
  28                 .pfn            = __phys_to_pfn(AT91_BASE_SYS),
  29                 .length         = SZ_4K,
  30                 .type           = MT_DEVICE,
  31         }, {
  32                 .virtual        = AT91_VA_BASE_EMAC,
  33                 .pfn            = __phys_to_pfn(AT91RM9200_BASE_EMAC),
  34                 .length         = SZ_16K,
  35                 .type           = MT_DEVICE,
  36         }, {
  37                 .virtual        = AT91_IO_VIRT_BASE - AT91RM9200_SRAM_SIZE,
  38                 .pfn            = __phys_to_pfn(AT91RM9200_SRAM_BASE),
  39                 .length         = AT91RM9200_SRAM_SIZE,
  40                 .type           = MT_DEVICE,
  41         },
  42 };
  43
  44 /* --------------------------------------------------------------------
  45  *  Clocks
  46  * -------------------------------------------------------------------- */
  47
  48 /*
  49  * The peripheral clocks.
  50  */
  51 static struct clk udc_clk = {
  52         .name           = "udc_clk",
  53         .pmc_mask       = 1 << AT91RM9200_ID_UDP,
  54         .type           = CLK_TYPE_PERIPHERAL,
  55 };
  56 static struct clk ohci_clk = {
  57         .name           = "ohci_clk",
  58         .pmc_mask       = 1 << AT91RM9200_ID_UHP,
  59         .type           = CLK_TYPE_PERIPHERAL,
  60 };
  61 static struct clk ether_clk = {
  62         .name           = "ether_clk",
  63         .pmc_mask       = 1 << AT91RM9200_ID_EMAC,
  64         .type           = CLK_TYPE_PERIPHERAL,
  65 };
  66 static struct clk mmc_clk = {
  67         .name           = "mci_clk",
  68         .pmc_mask       = 1 << AT91RM9200_ID_MCI,
  69         .type           = CLK_TYPE_PERIPHERAL,
  70 };
  71 static struct clk twi_clk = {
  72         .name           = "twi_clk",
  73         .pmc_mask       = 1 << AT91RM9200_ID_TWI,
  74         .type           = CLK_TYPE_PERIPHERAL,
  75 };
  76 static struct clk usart0_clk = {
  77         .name           = "usart0_clk",
  78         .pmc_mask       = 1 << AT91RM9200_ID_US0,
  79         .type           = CLK_TYPE_PERIPHERAL,
  80 };
  81 static struct clk usart1_clk = {
  82         .name           = "usart1_clk",
  83         .pmc_mask       = 1 << AT91RM9200_ID_US1,
  84         .type           = CLK_TYPE_PERIPHERAL,
  85 };
  86 static struct clk usart2_clk = {
  87         .name           = "usart2_clk",
  88         .pmc_mask       = 1 << AT91RM9200_ID_US2,
  89         .type           = CLK_TYPE_PERIPHERAL,
  90 };
  91 static struct clk usart3_clk = {
  92         .name           = "usart3_clk",
  93         .pmc_mask       = 1 << AT91RM9200_ID_US3,
  94         .type           = CLK_TYPE_PERIPHERAL,
  95 };
  96 static struct clk spi_clk = {
  97         .name           = "spi_clk",
  98         .pmc_mask       = 1 << AT91RM9200_ID_SPI,
  99         .type           = CLK_TYPE_PERIPHERAL,
 100 };
 101 static struct clk pioA_clk = {
 102         .name           = "pioA_clk",
 103         .pmc_mask       = 1 << AT91RM9200_ID_PIOA,
 104         .type           = CLK_TYPE_PERIPHERAL,
 105 };
 106 static struct clk pioB_clk = {
 107         .name           = "pioB_clk",
 108         .pmc_mask       = 1 << AT91RM9200_ID_PIOB,
 109         .type           = CLK_TYPE_PERIPHERAL,
 110 };
 111 static struct clk pioC_clk = {
 112         .name           = "pioC_clk",
 113         .pmc_mask       = 1 << AT91RM9200_ID_PIOC,
 114         .type           = CLK_TYPE_PERIPHERAL,
 115 };
 116 static struct clk pioD_clk = {
 117         .name           = "pioD_clk",
 118         .pmc_mask       = 1 << AT91RM9200_ID_PIOD,
 119         .type           = CLK_TYPE_PERIPHERAL,
 120 };
 121 static struct clk ssc0_clk = {
 122         .name           = "ssc0_clk",
 123         .pmc_mask       = 1 << AT91RM9200_ID_SSC0,
 124         .type           = CLK_TYPE_PERIPHERAL,
 125 };
 126 static struct clk ssc1_clk = {
 127         .name           = "ssc1_clk",
 128         .pmc_mask       = 1 << AT91RM9200_ID_SSC1,
 129         .type           = CLK_TYPE_PERIPHERAL,
 130 };
 131 static struct clk ssc2_clk = {
 132         .name           = "ssc2_clk",
 133         .pmc_mask       = 1 << AT91RM9200_ID_SSC2,
 134         .type           = CLK_TYPE_PERIPHERAL,
 135 };
 136 static struct clk tc0_clk = {
 137         .name           = "tc0_clk",
 138         .pmc_mask       = 1 << AT91RM9200_ID_TC0,
 139         .type           = CLK_TYPE_PERIPHERAL,
 140 };
 141 static struct clk tc1_clk = {
 142         .name           = "tc1_clk",
 143         .pmc_mask       = 1 << AT91RM9200_ID_TC1,
 144         .type           = CLK_TYPE_PERIPHERAL,
 145 };
 146 static struct clk tc2_clk = {
 147         .name           = "tc2_clk",
 148         .pmc_mask       = 1 << AT91RM9200_ID_TC2,
 149         .type           = CLK_TYPE_PERIPHERAL,
 150 };
 151 static struct clk tc3_clk = {
 152         .name           = "tc3_clk",
 153         .pmc_mask       = 1 << AT91RM9200_ID_TC3,
 154         .type           = CLK_TYPE_PERIPHERAL,
 155 };
 156 static struct clk tc4_clk = {
 157         .name           = "tc4_clk",
 158         .pmc_mask       = 1 << AT91RM9200_ID_TC4,
 159         .type           = CLK_TYPE_PERIPHERAL,
 160 };
 161 static struct clk tc5_clk = {
 162         .name           = "tc5_clk",
 163         .pmc_mask       = 1 << AT91RM9200_ID_TC5,
 164         .type           = CLK_TYPE_PERIPHERAL,
 165 };
 166
 167 static struct clk *periph_clocks[] __initdata = {
 168         &pioA_clk,
 169         &pioB_clk,
 170         &pioC_clk,
 171         &pioD_clk,
 172         &usart0_clk,
 173         &usart1_clk,
 174         &usart2_clk,
 175         &usart3_clk,
 176         &mmc_clk,
 177         &udc_clk,
 178         &twi_clk,
 179         &spi_clk,
 180         &ssc0_clk,
 181         &ssc1_clk,
 182         &ssc2_clk,
 183         &tc0_clk,
 184         &tc1_clk,
 185         &tc2_clk,
 186         &tc3_clk,
 187         &tc4_clk,
 188         &tc5_clk,
 189         &ohci_clk,
 190         &ether_clk,
 191         // irq0 .. irq6
 192 };
 193
 194 /*
 195  * The four programmable clocks.
 196  * You must configure pin multiplexing to bring these signals out.
 197  */
 198 static struct clk pck0 = {
 199         .name           = "pck0",
 200         .pmc_mask       = AT91_PMC_PCK0,
 201         .type           = CLK_TYPE_PROGRAMMABLE,
 202         .id             = 0,
 203 };
 204 static struct clk pck1 = {
 205         .name           = "pck1",
 206         .pmc_mask       = AT91_PMC_PCK1,
 207         .type           = CLK_TYPE_PROGRAMMABLE,
 208         .id             = 1,
 209 };
 210 static struct clk pck2 = {
 211         .name           = "pck2",
 212         .pmc_mask       = AT91_PMC_PCK2,
 213         .type           = CLK_TYPE_PROGRAMMABLE,
 214         .id             = 2,
 215 };
 216 static struct clk pck3 = {
 217         .name           = "pck3",
 218         .pmc_mask       = AT91_PMC_PCK3,
 219         .type           = CLK_TYPE_PROGRAMMABLE,
 220         .id             = 3,
 221 };
 222
 223 static void __init at91rm9200_register_clocks(void)
 224 {
 225         int i;
 226
 227         for (i = 0; i < ARRAY_SIZE(periph_clocks); i++)
 228                 clk_register(periph_clocks[i]);
 229
 230         clk_register(&pck0);
 231         clk_register(&pck1);
 232         clk_register(&pck2);
 233         clk_register(&pck3);
 234 }
 235
 236 /* --------------------------------------------------------------------
 237  *  GPIO
 238  * -------------------------------------------------------------------- */
 239
 240 static struct at91_gpio_bank at91rm9200_gpio[] = {
 241         {
 242                 .id             = AT91RM9200_ID_PIOA,
 243                 .offset         = AT91_PIOA,
 244                 .clock          = &pioA_clk,
 245         }, {
 246                 .id             = AT91RM9200_ID_PIOB,
 247                 .offset         = AT91_PIOB,
 248                 .clock          = &pioB_clk,
 249         }, {
 250                 .id             = AT91RM9200_ID_PIOC,
 251                 .offset         = AT91_PIOC,
 252                 .clock          = &pioC_clk,
 253         }, {
 254                 .id             = AT91RM9200_ID_PIOD,
 255                 .offset         = AT91_PIOD,
 256                 .clock          = &pioD_clk,
 257         }
 258 };
 259
 260 static void at91rm9200_reset(void)
 261 {
 262         /*
 263          * Perform a hardware reset with the use of the Watchdog timer.
 264          */
 265         at91_sys_write(AT91_ST_WDMR, AT91_ST_RSTEN | AT91_ST_EXTEN | 1);
 266         at91_sys_write(AT91_ST_CR, AT91_ST_WDRST);
 267 }
 268
 269
 270 /* --------------------------------------------------------------------
 271  *  AT91RM9200 processor initialization
 272  * -------------------------------------------------------------------- */
 273 void __init at91rm9200_initialize(unsigned long main_clock, unsigned short banks)
 274 {
 275         /* Map peripherals */
 276         iotable_init(at91rm9200_io_desc, ARRAY_SIZE(at91rm9200_io_desc));
 277
 278         at91_arch_reset = at91rm9200_reset;
 279         at91_extern_irq = (1 << AT91RM9200_ID_IRQ0) | (1 << AT91RM9200_ID_IRQ1)
 280                         | (1 << AT91RM9200_ID_IRQ2) | (1 << AT91RM9200_ID_IRQ3)
 281                         | (1 << AT91RM9200_ID_IRQ4) | (1 << AT91RM9200_ID_IRQ5)
 282                         | (1 << AT91RM9200_ID_IRQ6);
 283
 284         /* Init clock subsystem */
 285         at91_clock_init(main_clock);
 286
 287         /* Register the processor-specific clocks */
 288         at91rm9200_register_clocks();
 289
 290         /* Initialize GPIO subsystem */
 291         at91_gpio_init(at91rm9200_gpio, banks);
 292 }
 293
 294
 295 /* --------------------------------------------------------------------
 296  *  Interrupt initialization
 297  * -------------------------------------------------------------------- */
 298
 299 /*
 300  * The default interrupt priority levels (0 = lowest, 7 = highest).
 301  */
 302 static unsigned int at91rm9200_default_irq_priority[NR_AIC_IRQS] __initdata = {
 303         7,      /* Advanced Interrupt Controller (FIQ) */
 304         7,      /* System Peripherals */
 305         1,      /* Parallel IO Controller A */
 306         1,      /* Parallel IO Controller B */
 307         1,      /* Parallel IO Controller C */
 308         1,      /* Parallel IO Controller D */
 309         5,      /* USART 0 */
 310         5,      /* USART 1 */
 311         5,      /* USART 2 */
 312         5,      /* USART 3 */
 313         0,      /* Multimedia Card Interface */
 314         2,      /* USB Device Port */
 315         6,      /* Two-Wire Interface */
 316         5,      /* Serial Peripheral Interface */
 317         4,      /* Serial Synchronous Controller 0 */
 318         4,      /* Serial Synchronous Controller 1 */
 319         4,      /* Serial Synchronous Controller 2 */
 320         0,      /* Timer Counter 0 */
 321         0,      /* Timer Counter 1 */
 322         0,      /* Timer Counter 2 */
 323         0,      /* Timer Counter 3 */
 324         0,      /* Timer Counter 4 */
 325         0,      /* Timer Counter 5 */
 326         2,      /* USB Host port */
 327         3,      /* Ethernet MAC */
 328         0,      /* Advanced Interrupt Controller (IRQ0) */
 329         0,      /* Advanced Interrupt Controller (IRQ1) */
 330         0,      /* Advanced Interrupt Controller (IRQ2) */
 331         0,      /* Advanced Interrupt Controller (IRQ3) */
 332         0,      /* Advanced Interrupt Controller (IRQ4) */
 333         0,      /* Advanced Interrupt Controller (IRQ5) */
 334         0       /* Advanced Interrupt Controller (IRQ6) */
 335 };
 336
 337 void __init at91rm9200_init_interrupts(unsigned int priority[NR_AIC_IRQS])
 338 {
 339         if (!priority)
 340                 priority = at91rm9200_default_irq_priority;
 341
 342         /* Initialize the AIC interrupt controller */
 343         at91_aic_init(priority);
 344
 345         /* Enable GPIO interrupts */
 346         at91_gpio_irq_setup();
 347 }