core.c

Go to the documentation of this file.

/*
 *  linux/arch/arm/mach-shark/arch.c
 *
 *  Architecture specific stuff.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/serial_8250.h>
#include <linux/io.h>

#include <asm/setup.h>
#include <asm/mach-types.h>
#include <asm/param.h>
#include <asm/system_misc.h>

#include <asm/mach/map.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>

#define ROMCARD_SIZE            0x08000000
#define ROMCARD_START           0x10000000

static void shark_restart(char mode, const char *cmd)
{
        short temp;
        /* Reset the Machine via pc[3] of the sequoia chipset */
        outw(0x09,0x24);
        temp=inw(0x26);
        temp = temp | (1<<3) | (1<<10);
        outw(0x09,0x24);
        outw(temp,0x26);
}

static struct plat_serial8250_port serial_platform_data[] = {
    {
        .iobase     = 0x3f8,
        .irq        = 4,
        .uartclk    = 1843200,
        .regshift   = 0,
        .iotype     = UPIO_PORT,
        .flags      = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST,
    },
    {
        .iobase     = 0x2f8,
        .irq        = 3,
        .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 rtc_resources[] = {
    [0] = {
        .start  = 0x70,
        .end    = 0x73,
        .flags  = IORESOURCE_IO,
    },
    [1] = {
        .start  = IRQ_ISA_RTC_ALARM,
        .end    = IRQ_ISA_RTC_ALARM,
        .flags  = IORESOURCE_IRQ,
    }
};

static struct platform_device rtc_device = {
    .name       = "rtc_cmos",
    .id     = -1,
    .resource   = rtc_resources,
    .num_resources  = ARRAY_SIZE(rtc_resources),
};

static int __init shark_init(void)
{
    int ret;

    if (machine_is_shark())
    {
            ret = platform_device_register(&rtc_device);
        if (ret) printk(KERN_ERR "Unable to register RTC device: %d\n", ret);
        ret = platform_device_register(&serial_device);
        if (ret) printk(KERN_ERR "Unable to register Serial device: %d\n", ret);
    }
    return 0;
}

arch_initcall(shark_init);

extern void shark_init_irq(void);

#define IRQ_TIMER 0
#define HZ_TIME ((1193180 + HZ/2) / HZ)

static irqreturn_t
shark_timer_interrupt(int irq, void *dev_id)
{
    timer_tick();
    return IRQ_HANDLED;
}

static struct irqaction shark_timer_irq = {
    .name       = "Shark Timer Tick",
    .flags      = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
    .handler    = shark_timer_interrupt,
};

/*
 * Set up timer interrupt, and return the current time in seconds.
 */
static void __init shark_timer_init(void)
{
    outb(0x34, 0x43);               /* binary, mode 0, LSB/MSB, Ch 0 */
    outb(HZ_TIME & 0xff, 0x40);     /* LSB of count */
    outb(HZ_TIME >> 8, 0x40);

    setup_irq(IRQ_TIMER, &shark_timer_irq);
}

static struct sys_timer shark_timer = {
    .init       = shark_timer_init,
};

static void shark_init_early(void)
{
    disable_hlt();
}

MACHINE_START(SHARK, "Shark")
    /* Maintainer: Alexander Schulz */
    .atag_offset    = 0x3000,
    .init_early = shark_init_early,
    .init_irq   = shark_init_irq,
    .timer      = &shark_timer,
    .dma_zone_size  = SZ_4M,
    .restart    = shark_restart,
MACHINE_END