LXR linux/arch/arm/mach-sa1100/generic.c

   1/*
   2 * linux/arch/arm/mach-sa1100/generic.c
   3 *
   4 * Author: Nicolas Pitre
   5 *
   6 * Code common to all SA11x0 machines.
   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/module.h>
  13#include <linux/kernel.h>
  14#include <linux/init.h>
  15#include <linux/delay.h>
  16#include <linux/pm.h>
  17#include <linux/cpufreq.h>
  18#include <linux/ioport.h>
  19#include <linux/platform_device.h>
  20
  21#include <asm/div64.h>
  22#include <mach/hardware.h>
  23#include <asm/system.h>
  24#include <asm/mach/map.h>
  25#include <asm/mach/flash.h>
  26#include <asm/irq.h>
  27#include <asm/gpio.h>
  28
  29#include "generic.h"
  30
  31unsigned int reset_status;
  32EXPORT_SYMBOL(reset_status);
  33
  34#define NR_FREQS        16
  35
  36/*
  37 * This table is setup for a 3.6864MHz Crystal.
  38 */
  39static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
  40         590,   /*  59.0 MHz */
  41         737,   /*  73.7 MHz */
  42         885,   /*  88.5 MHz */
  43        1032,   /* 103.2 MHz */
  44        1180,   /* 118.0 MHz */
  45        1327,   /* 132.7 MHz */
  46        1475,   /* 147.5 MHz */
  47        1622,   /* 162.2 MHz */
  48        1769,   /* 176.9 MHz */
  49        1917,   /* 191.7 MHz */
  50        2064,   /* 206.4 MHz */
  51        2212,   /* 221.2 MHz */
  52        2359,   /* 235.9 MHz */
  53        2507,   /* 250.7 MHz */
  54        2654,   /* 265.4 MHz */
  55        2802    /* 280.2 MHz */
  56};
  57
  58/* rounds up(!)  */
  59unsigned int sa11x0_freq_to_ppcr(unsigned int khz)
  60{
  61        int i;
  62
  63        khz /= 100;
  64
  65        for (i = 0; i < NR_FREQS; i++)
  66                if (cclk_frequency_100khz[i] >= khz)
  67                        break;
  68
  69        return i;
  70}
  71
  72unsigned int sa11x0_ppcr_to_freq(unsigned int idx)
  73{
  74        unsigned int freq = 0;
  75        if (idx < NR_FREQS)
  76                freq = cclk_frequency_100khz[idx] * 100;
  77        return freq;
  78}
  79
  80
  81/* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
  82 * this platform, anyway.
  83 */
  84int sa11x0_verify_speed(struct cpufreq_policy *policy)
  85{
  86        unsigned int tmp;
  87        if (policy->cpu)
  88                return -EINVAL;
  89
  90        cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
  91
  92        /* make sure that at least one frequency is within the policy */
  93        tmp = cclk_frequency_100khz[sa11x0_freq_to_ppcr(policy->min)] * 100;
  94        if (tmp > policy->max)
  95                policy->max = tmp;
  96
  97        cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);
  98
  99        return 0;
 100}
 101
 102unsigned int sa11x0_getspeed(unsigned int cpu)
 103{
 104        if (cpu)
 105                return 0;
 106        return cclk_frequency_100khz[PPCR & 0xf] * 100;
 107}
 108
 109/*
 110 * Default power-off for SA1100
 111 */
 112static void sa1100_power_off(void)
 113{
 114        mdelay(100);
 115        local_irq_disable();
 116        /* disable internal oscillator, float CS lines */
 117        PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
 118        /* enable wake-up on GPIO0 (Assabet...) */
 119        PWER = GFER = GRER = 1;
 120        /*
 121         * set scratchpad to zero, just in case it is used as a
 122         * restart address by the bootloader.
 123         */
 124        PSPR = 0;
 125        /* enter sleep mode */
 126        PMCR = PMCR_SF;
 127}
 128
 129static void sa11x0_register_device(struct platform_device *dev, void *data)
 130{
 131        int err;
 132        dev->dev.platform_data = data;
 133        err = platform_device_register(dev);
 134        if (err)
 135                printk(KERN_ERR "Unable to register device %s: %d\n",
 136                        dev->name, err);
 137}
 138
 139
 140static struct resource sa11x0udc_resources[] = {
 141        [0] = {
 142                .start  = __PREG(Ser0UDCCR),
 143                .end    = __PREG(Ser0UDCCR) + 0xffff,
 144                .flags  = IORESOURCE_MEM,
 145        },
 146        [1] = {
 147                .start  = IRQ_Ser0UDC,
 148                .end    = IRQ_Ser0UDC,
 149                .flags  = IORESOURCE_IRQ,
 150        },
 151};
 152
 153static u64 sa11x0udc_dma_mask = 0xffffffffUL;
 154
 155static struct platform_device sa11x0udc_device = {
 156        .name           = "sa11x0-udc",
 157        .id             = -1,
 158        .dev            = {
 159                .dma_mask = &sa11x0udc_dma_mask,
 160                .coherent_dma_mask = 0xffffffff,
 161        },
 162        .num_resources  = ARRAY_SIZE(sa11x0udc_resources),
 163        .resource       = sa11x0udc_resources,
 164};
 165
 166static struct resource sa11x0uart1_resources[] = {
 167        [0] = {
 168                .start  = __PREG(Ser1UTCR0),
 169                .end    = __PREG(Ser1UTCR0) + 0xffff,
 170                .flags  = IORESOURCE_MEM,
 171        },
 172        [1] = {
 173                .start  = IRQ_Ser1UART,
 174                .end    = IRQ_Ser1UART,
 175                .flags  = IORESOURCE_IRQ,
 176        },
 177};
 178
 179static struct platform_device sa11x0uart1_device = {
 180        .name           = "sa11x0-uart",
 181        .id             = 1,
 182        .num_resources  = ARRAY_SIZE(sa11x0uart1_resources),
 183        .resource       = sa11x0uart1_resources,
 184};
 185
 186static struct resource sa11x0uart3_resources[] = {
 187        [0] = {
 188                .start  = __PREG(Ser3UTCR0),
 189                .end    = __PREG(Ser3UTCR0) + 0xffff,
 190                .flags  = IORESOURCE_MEM,
 191        },
 192        [1] = {
 193                .start  = IRQ_Ser3UART,
 194                .end    = IRQ_Ser3UART,
 195                .flags  = IORESOURCE_IRQ,
 196        },
 197};
 198
 199static struct platform_device sa11x0uart3_device = {
 200        .name           = "sa11x0-uart",
 201        .id             = 3,
 202        .num_resources  = ARRAY_SIZE(sa11x0uart3_resources),
 203        .resource       = sa11x0uart3_resources,
 204};
 205
 206static struct resource sa11x0mcp_resources[] = {
 207        [0] = {
 208                .start  = __PREG(Ser4MCCR0),
 209                .end    = __PREG(Ser4MCCR0) + 0xffff,
 210                .flags  = IORESOURCE_MEM,
 211        },
 212        [1] = {
 213                .start  = IRQ_Ser4MCP,
 214                .end    = IRQ_Ser4MCP,
 215                .flags  = IORESOURCE_IRQ,
 216        },
 217};
 218
 219static u64 sa11x0mcp_dma_mask = 0xffffffffUL;
 220
 221static struct platform_device sa11x0mcp_device = {
 222        .name           = "sa11x0-mcp",
 223        .id             = -1,
 224        .dev = {
 225                .dma_mask = &sa11x0mcp_dma_mask,
 226                .coherent_dma_mask = 0xffffffff,
 227        },
 228        .num_resources  = ARRAY_SIZE(sa11x0mcp_resources),
 229        .resource       = sa11x0mcp_resources,
 230};
 231
 232void sa11x0_register_mcp(struct mcp_plat_data *data)
 233{
 234        sa11x0_register_device(&sa11x0mcp_device, data);
 235}
 236
 237static struct resource sa11x0ssp_resources[] = {
 238        [0] = {
 239                .start  = 0x80070000,
 240                .end    = 0x8007ffff,
 241                .flags  = IORESOURCE_MEM,
 242        },
 243        [1] = {
 244                .start  = IRQ_Ser4SSP,
 245                .end    = IRQ_Ser4SSP,
 246                .flags  = IORESOURCE_IRQ,
 247        },
 248};
 249
 250static u64 sa11x0ssp_dma_mask = 0xffffffffUL;
 251
 252static struct platform_device sa11x0ssp_device = {
 253        .name           = "sa11x0-ssp",
 254        .id             = -1,
 255        .dev = {
 256                .dma_mask = &sa11x0ssp_dma_mask,
 257                .coherent_dma_mask = 0xffffffff,
 258        },
 259        .num_resources  = ARRAY_SIZE(sa11x0ssp_resources),
 260        .resource       = sa11x0ssp_resources,
 261};
 262
 263static struct resource sa11x0fb_resources[] = {
 264        [0] = {
 265                .start  = 0xb0100000,
 266                .end    = 0xb010ffff,
 267                .flags  = IORESOURCE_MEM,
 268        },
 269        [1] = {
 270                .start  = IRQ_LCD,
 271                .end    = IRQ_LCD,
 272                .flags  = IORESOURCE_IRQ,
 273        },
 274};
 275
 276static struct platform_device sa11x0fb_device = {
 277        .name           = "sa11x0-fb",
 278        .id             = -1,
 279        .dev = {
 280                .coherent_dma_mask = 0xffffffff,
 281        },
 282        .num_resources  = ARRAY_SIZE(sa11x0fb_resources),
 283        .resource       = sa11x0fb_resources,
 284};
 285
 286static struct platform_device sa11x0pcmcia_device = {
 287        .name           = "sa11x0-pcmcia",
 288        .id             = -1,
 289};
 290
 291static struct platform_device sa11x0mtd_device = {
 292        .name           = "sa1100-mtd",
 293        .id             = -1,
 294};
 295
 296void sa11x0_register_mtd(struct flash_platform_data *flash,
 297                         struct resource *res, int nr)
 298{
 299        flash->name = "sa1100";
 300        sa11x0mtd_device.resource = res;
 301        sa11x0mtd_device.num_resources = nr;
 302        sa11x0_register_device(&sa11x0mtd_device, flash);
 303}
 304
 305static struct resource sa11x0ir_resources[] = {
 306        {
 307                .start  = __PREG(Ser2UTCR0),
 308                .end    = __PREG(Ser2UTCR0) + 0x24 - 1,
 309                .flags  = IORESOURCE_MEM,
 310        }, {
 311                .start  = __PREG(Ser2HSCR0),
 312                .end    = __PREG(Ser2HSCR0) + 0x1c - 1,
 313                .flags  = IORESOURCE_MEM,
 314        }, {
 315                .start  = __PREG(Ser2HSCR2),
 316                .end    = __PREG(Ser2HSCR2) + 0x04 - 1,
 317                .flags  = IORESOURCE_MEM,
 318        }, {
 319                .start  = IRQ_Ser2ICP,
 320                .end    = IRQ_Ser2ICP,
 321                .flags  = IORESOURCE_IRQ,
 322        }
 323};
 324
 325static struct platform_device sa11x0ir_device = {
 326        .name           = "sa11x0-ir",
 327        .id             = -1,
 328        .num_resources  = ARRAY_SIZE(sa11x0ir_resources),
 329        .resource       = sa11x0ir_resources,
 330};
 331
 332void sa11x0_register_irda(struct irda_platform_data *irda)
 333{
 334        sa11x0_register_device(&sa11x0ir_device, irda);
 335}
 336
 337static struct platform_device sa11x0rtc_device = {
 338        .name           = "sa1100-rtc",
 339        .id             = -1,
 340};
 341
 342static struct platform_device *sa11x0_devices[] __initdata = {
 343        &sa11x0udc_device,
 344        &sa11x0uart1_device,
 345        &sa11x0uart3_device,
 346        &sa11x0ssp_device,
 347        &sa11x0pcmcia_device,
 348        &sa11x0fb_device,
 349        &sa11x0rtc_device,
 350};
 351
 352static int __init sa1100_init(void)
 353{
 354        pm_power_off = sa1100_power_off;
 355        return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
 356}
 357
 358arch_initcall(sa1100_init);
 359
 360void (*sa1100fb_backlight_power)(int on);
 361void (*sa1100fb_lcd_power)(int on);
 362
 363EXPORT_SYMBOL(sa1100fb_backlight_power);
 364EXPORT_SYMBOL(sa1100fb_lcd_power);
 365
 366
 367/*
 368 * Common I/O mapping:
 369 *
 370 * Typically, static virtual address mappings are as follow:
 371 *
 372 * 0xf0000000-0xf3ffffff:       miscellaneous stuff (CPLDs, etc.)
 373 * 0xf4000000-0xf4ffffff:       SA-1111
 374 * 0xf5000000-0xf5ffffff:       reserved (used by cache flushing area)
 375 * 0xf6000000-0xfffeffff:       reserved (internal SA1100 IO defined above)
 376 * 0xffff0000-0xffff0fff:       SA1100 exception vectors
 377 * 0xffff2000-0xffff2fff:       Minicache copy_user_page area
 378 *
 379 * Below 0xe8000000 is reserved for vm allocation.
 380 *
 381 * The machine specific code must provide the extra mapping beside the
 382 * default mapping provided here.
 383 */
 384
 385static struct map_desc standard_io_desc[] __initdata = {
 386        {       /* PCM */
 387                .virtual        =  0xf8000000,
 388                .pfn            = __phys_to_pfn(0x80000000),
 389                .length         = 0x00100000,
 390                .type           = MT_DEVICE
 391        }, {    /* SCM */
 392                .virtual        =  0xfa000000,
 393                .pfn            = __phys_to_pfn(0x90000000),
 394                .length         = 0x00100000,
 395                .type           = MT_DEVICE
 396        }, {    /* MER */
 397                .virtual        =  0xfc000000,
 398                .pfn            = __phys_to_pfn(0xa0000000),
 399                .length         = 0x00100000,
 400                .type           = MT_DEVICE
 401        }, {    /* LCD + DMA */
 402                .virtual        =  0xfe000000,
 403                .pfn            = __phys_to_pfn(0xb0000000),
 404                .length         = 0x00200000,
 405                .type           = MT_DEVICE
 406        },
 407};
 408
 409void __init sa1100_map_io(void)
 410{
 411        iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
 412}
 413
 414/*
 415 * Disable the memory bus request/grant signals on the SA1110 to
 416 * ensure that we don't receive spurious memory requests.  We set
 417 * the MBGNT signal false to ensure the SA1111 doesn't own the
 418 * SDRAM bus.
 419 */
 420void __init sa1110_mb_disable(void)
 421{
 422        unsigned long flags;
 423
 424        local_irq_save(flags);
 425        
 426        PGSR &= ~GPIO_MBGNT;
 427        GPCR = GPIO_MBGNT;
 428        GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 429
 430        GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);
 431
 432        local_irq_restore(flags);
 433}
 434
 435/*
 436 * If the system is going to use the SA-1111 DMA engines, set up
 437 * the memory bus request/grant pins.
 438 */
 439void __devinit sa1110_mb_enable(void)
 440{
 441        unsigned long flags;
 442
 443        local_irq_save(flags);
 444
 445        PGSR &= ~GPIO_MBGNT;
 446        GPCR = GPIO_MBGNT;
 447        GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;
 448
 449        GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
 450        TUCR |= TUCR_MR;
 451
 452        local_irq_restore(flags);
 453}
 454
 455