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generic.c

/*
 * linux/arch/arm/mach-sa1100/generic.c
 *
 * Author: Nicolas Pitre
 *
 * Code common to all SA11x0 machines.
 *
 * 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.
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/cpufreq.h>
#include <linux/ioport.h>
#include <linux/sched.h>      /* just for sched_clock() - funny that */
#include <linux/platform_device.h>

#include <asm/div64.h>
#include <asm/cnt32_to_63.h>
#include <mach/hardware.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/mach/map.h>
#include <asm/mach/flash.h>
#include <asm/irq.h>
#include <asm/gpio.h>

#include "generic.h"

unsigned int reset_status;
EXPORT_SYMBOL(reset_status);

#define NR_FREQS  16

/*
 * This table is setup for a 3.6864MHz Crystal.
 */
static const unsigned short cclk_frequency_100khz[NR_FREQS] = {
       590, /*  59.0 MHz */
       737, /*  73.7 MHz */
       885,       /*  88.5 MHz */
      1032, /* 103.2 MHz */
      1180, /* 118.0 MHz */
      1327, /* 132.7 MHz */
      1475, /* 147.5 MHz */
      1622, /* 162.2 MHz */
      1769, /* 176.9 MHz */
      1917, /* 191.7 MHz */
      2064, /* 206.4 MHz */
      2212, /* 221.2 MHz */
      2359,   /* 235.9 MHz */
      2507,   /* 250.7 MHz */
      2654,   /* 265.4 MHz */
      2802    /* 280.2 MHz */
};

#if defined(CONFIG_CPU_FREQ_SA1100) || defined(CONFIG_CPU_FREQ_SA1110)
/* rounds up(!)  */
unsigned int sa11x0_freq_to_ppcr(unsigned int khz)
{
      int i;

      khz /= 100;

      for (i = 0; i < NR_FREQS; i++)
            if (cclk_frequency_100khz[i] >= khz)
                  break;

      return i;
}

unsigned int sa11x0_ppcr_to_freq(unsigned int idx)
{
      unsigned int freq = 0;
      if (idx < NR_FREQS)
            freq = cclk_frequency_100khz[idx] * 100;
      return freq;
}


/* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
 * this platform, anyway.
 */
int sa11x0_verify_speed(struct cpufreq_policy *policy)
{
      unsigned int tmp;
      if (policy->cpu)
            return -EINVAL;

      cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);

      /* make sure that at least one frequency is within the policy */
      tmp = cclk_frequency_100khz[sa11x0_freq_to_ppcr(policy->min)] * 100;
      if (tmp > policy->max)
            policy->max = tmp;

      cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq);

      return 0;
}

unsigned int sa11x0_getspeed(unsigned int cpu)
{
      if (cpu)
            return 0;
      return cclk_frequency_100khz[PPCR & 0xf] * 100;
}

#else
/*
 * We still need to provide this so building without cpufreq works.
 */ 
unsigned int cpufreq_get(unsigned int cpu)
{
      return cclk_frequency_100khz[PPCR & 0xf] * 100;
}
EXPORT_SYMBOL(cpufreq_get);
#endif

/*
 * This is the SA11x0 sched_clock implementation.  This has
 * a resolution of 271ns, and a maximum value of 32025597s (370 days).
 *
 * The return value is guaranteed to be monotonic in that range as
 * long as there is always less than 582 seconds between successive
 * calls to this function.
 *
 *  ( * 1E9 / 3686400 => * 78125 / 288)
 */
unsigned long long sched_clock(void)
{
      unsigned long long v = cnt32_to_63(OSCR);

      /* the <<1 gets rid of the cnt_32_to_63 top bit saving on a bic insn */
      v *= 78125<<1;
      do_div(v, 288<<1);

      return v;
}

/*
 * Default power-off for SA1100
 */
static void sa1100_power_off(void)
{
      mdelay(100);
      local_irq_disable();
      /* disable internal oscillator, float CS lines */
      PCFR = (PCFR_OPDE | PCFR_FP | PCFR_FS);
      /* enable wake-up on GPIO0 (Assabet...) */
      PWER = GFER = GRER = 1;
      /*
       * set scratchpad to zero, just in case it is used as a
       * restart address by the bootloader.
       */
      PSPR = 0;
      /* enter sleep mode */
      PMCR = PMCR_SF;
}

static struct resource sa11x0udc_resources[] = {
      [0] = {
            .start      = 0x80000000,
            .end  = 0x8000ffff,
            .flags      = IORESOURCE_MEM,
      },
};

static u64 sa11x0udc_dma_mask = 0xffffffffUL;

static struct platform_device sa11x0udc_device = {
      .name       = "sa11x0-udc",
      .id         = -1,
      .dev        = {
            .dma_mask = &sa11x0udc_dma_mask,
            .coherent_dma_mask = 0xffffffff,
      },
      .num_resources    = ARRAY_SIZE(sa11x0udc_resources),
      .resource   = sa11x0udc_resources,
};

static struct resource sa11x0uart1_resources[] = {
      [0] = {
            .start      = 0x80010000,
            .end  = 0x8001ffff,
            .flags      = IORESOURCE_MEM,
      },
};

static struct platform_device sa11x0uart1_device = {
      .name       = "sa11x0-uart",
      .id         = 1,
      .num_resources    = ARRAY_SIZE(sa11x0uart1_resources),
      .resource   = sa11x0uart1_resources,
};

static struct resource sa11x0uart3_resources[] = {
      [0] = {
            .start      = 0x80050000,
            .end  = 0x8005ffff,
            .flags      = IORESOURCE_MEM,
      },
};

static struct platform_device sa11x0uart3_device = {
      .name       = "sa11x0-uart",
      .id         = 3,
      .num_resources    = ARRAY_SIZE(sa11x0uart3_resources),
      .resource   = sa11x0uart3_resources,
};

static struct resource sa11x0mcp_resources[] = {
      [0] = {
            .start      = 0x80060000,
            .end  = 0x8006ffff,
            .flags      = IORESOURCE_MEM,
      },
};

static u64 sa11x0mcp_dma_mask = 0xffffffffUL;

static struct platform_device sa11x0mcp_device = {
      .name       = "sa11x0-mcp",
      .id         = -1,
      .dev = {
            .dma_mask = &sa11x0mcp_dma_mask,
            .coherent_dma_mask = 0xffffffff,
      },
      .num_resources    = ARRAY_SIZE(sa11x0mcp_resources),
      .resource   = sa11x0mcp_resources,
};

void sa11x0_set_mcp_data(struct mcp_plat_data *data)
{
      sa11x0mcp_device.dev.platform_data = data;
}

static struct resource sa11x0ssp_resources[] = {
      [0] = {
            .start      = 0x80070000,
            .end  = 0x8007ffff,
            .flags      = IORESOURCE_MEM,
      },
};

static u64 sa11x0ssp_dma_mask = 0xffffffffUL;

static struct platform_device sa11x0ssp_device = {
      .name       = "sa11x0-ssp",
      .id         = -1,
      .dev = {
            .dma_mask = &sa11x0ssp_dma_mask,
            .coherent_dma_mask = 0xffffffff,
      },
      .num_resources    = ARRAY_SIZE(sa11x0ssp_resources),
      .resource   = sa11x0ssp_resources,
};

static struct resource sa11x0fb_resources[] = {
      [0] = {
            .start      = 0xb0100000,
            .end  = 0xb010ffff,
            .flags      = IORESOURCE_MEM,
      },
      [1] = {
            .start      = IRQ_LCD,
            .end  = IRQ_LCD,
            .flags      = IORESOURCE_IRQ,
      },
};

static struct platform_device sa11x0fb_device = {
      .name       = "sa11x0-fb",
      .id         = -1,
      .dev = {
            .coherent_dma_mask = 0xffffffff,
      },
      .num_resources    = ARRAY_SIZE(sa11x0fb_resources),
      .resource   = sa11x0fb_resources,
};

static struct platform_device sa11x0pcmcia_device = {
      .name       = "sa11x0-pcmcia",
      .id         = -1,
};

static struct platform_device sa11x0mtd_device = {
      .name       = "flash",
      .id         = -1,
};

void sa11x0_set_flash_data(struct flash_platform_data *flash,
                     struct resource *res, int nr)
{
      flash->name = "sa1100";
      sa11x0mtd_device.dev.platform_data = flash;
      sa11x0mtd_device.resource = res;
      sa11x0mtd_device.num_resources = nr;
}

static struct resource sa11x0ir_resources[] = {
      {
            .start      = __PREG(Ser2UTCR0),
            .end  = __PREG(Ser2UTCR0) + 0x24 - 1,
            .flags      = IORESOURCE_MEM,
      }, {
            .start      = __PREG(Ser2HSCR0),
            .end  = __PREG(Ser2HSCR0) + 0x1c - 1,
            .flags      = IORESOURCE_MEM,
      }, {
            .start      = __PREG(Ser2HSCR2),
            .end  = __PREG(Ser2HSCR2) + 0x04 - 1,
            .flags      = IORESOURCE_MEM,
      }, {
            .start      = IRQ_Ser2ICP,
            .end  = IRQ_Ser2ICP,
            .flags      = IORESOURCE_IRQ,
      }
};

static struct platform_device sa11x0ir_device = {
      .name       = "sa11x0-ir",
      .id         = -1,
      .num_resources    = ARRAY_SIZE(sa11x0ir_resources),
      .resource   = sa11x0ir_resources,
};

void sa11x0_set_irda_data(struct irda_platform_data *irda)
{
      sa11x0ir_device.dev.platform_data = irda;
}

static struct platform_device sa11x0rtc_device = {
      .name       = "sa1100-rtc",
      .id         = -1,
};

static struct platform_device *sa11x0_devices[] __initdata = {
      &sa11x0udc_device,
      &sa11x0uart1_device,
      &sa11x0uart3_device,
      &sa11x0mcp_device,
      &sa11x0ssp_device,
      &sa11x0pcmcia_device,
      &sa11x0fb_device,
      &sa11x0mtd_device,
      &sa11x0rtc_device,
};

static int __init sa1100_init(void)
{
      pm_power_off = sa1100_power_off;

      if (sa11x0ir_device.dev.platform_data)
            platform_device_register(&sa11x0ir_device);

      return platform_add_devices(sa11x0_devices, ARRAY_SIZE(sa11x0_devices));
}

arch_initcall(sa1100_init);

void (*sa1100fb_backlight_power)(int on);
void (*sa1100fb_lcd_power)(int on);

EXPORT_SYMBOL(sa1100fb_backlight_power);
EXPORT_SYMBOL(sa1100fb_lcd_power);


/*
 * Common I/O mapping:
 *
 * Typically, static virtual address mappings are as follow:
 *
 * 0xf0000000-0xf3ffffff:     miscellaneous stuff (CPLDs, etc.)
 * 0xf4000000-0xf4ffffff:     SA-1111
 * 0xf5000000-0xf5ffffff:     reserved (used by cache flushing area)
 * 0xf6000000-0xfffeffff:     reserved (internal SA1100 IO defined above)
 * 0xffff0000-0xffff0fff:     SA1100 exception vectors
 * 0xffff2000-0xffff2fff:     Minicache copy_user_page area
 *
 * Below 0xe8000000 is reserved for vm allocation.
 *
 * The machine specific code must provide the extra mapping beside the
 * default mapping provided here.
 */

static struct map_desc standard_io_desc[] __initdata = {
      {     /* PCM */
            .virtual    =  0xf8000000,
            .pfn        = __phys_to_pfn(0x80000000),
            .length           = 0x00100000,
            .type       = MT_DEVICE
      }, {  /* SCM */
            .virtual    =  0xfa000000,
            .pfn        = __phys_to_pfn(0x90000000),
            .length           = 0x00100000,
            .type       = MT_DEVICE
      }, {  /* MER */
            .virtual    =  0xfc000000,
            .pfn        = __phys_to_pfn(0xa0000000),
            .length           = 0x00100000,
            .type       = MT_DEVICE
      }, {  /* LCD + DMA */
            .virtual    =  0xfe000000,
            .pfn        = __phys_to_pfn(0xb0000000),
            .length           = 0x00200000,
            .type       = MT_DEVICE
      },
};

void __init sa1100_map_io(void)
{
      iotable_init(standard_io_desc, ARRAY_SIZE(standard_io_desc));
}

/*
 * Disable the memory bus request/grant signals on the SA1110 to
 * ensure that we don't receive spurious memory requests.  We set
 * the MBGNT signal false to ensure the SA1111 doesn't own the
 * SDRAM bus.
 */
void __init sa1110_mb_disable(void)
{
      unsigned long flags;

      local_irq_save(flags);
      
      PGSR &= ~GPIO_MBGNT;
      GPCR = GPIO_MBGNT;
      GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;

      GAFR &= ~(GPIO_MBGNT | GPIO_MBREQ);

      local_irq_restore(flags);
}

/*
 * If the system is going to use the SA-1111 DMA engines, set up
 * the memory bus request/grant pins.
 */
void __devinit sa1110_mb_enable(void)
{
      unsigned long flags;

      local_irq_save(flags);

      PGSR &= ~GPIO_MBGNT;
      GPCR = GPIO_MBGNT;
      GPDR = (GPDR & ~GPIO_MBREQ) | GPIO_MBGNT;

      GAFR |= (GPIO_MBGNT | GPIO_MBREQ);
      TUCR |= TUCR_MR;

      local_irq_restore(flags);
}


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