s3c6410_map_io()的调用流程:

//arch/arm/mach-s3c6410/s3c6410.c
void __init s3c6410_map_io(struct map_desc *mach_desc, int size)
{
    /* register our io-tables */
    iotable_init(s3c6410_iodesc, ARRAY_SIZE(s3c6410_iodesc));
    iotable_init(mach_desc, size);

    /* set our idle function */
    s3c24xx_idle = s3c6410_idle;
}

static struct cpu_table cpu_ids[] __initdata = {
    .............................,
    {
        .idcode        = 0x36410100,
        .idmask        = 0xfffffff0,
        .map_io        = s3c6410_map_io,
        .init_clocks    = s3c6410_init_clocks,
        .init_uarts    = s3c6410_init_uarts,
        .init        = s3c6410_init,
        .name        = name_s3c6410
    },
    .............................,
};

void __init s3c24xx_init_io(struct map_desc *mach_desc, int size)
{
    unsigned long idcode = 0x0;

    .............................;

    cpu = s3c_lookup_cpu(idcode);

    if (cpu == NULL) {
        printk(KERN_ERR "Unknown CPU type 0x%08lx ", idcode);
        panic("Unknown S3C24XX CPU");
    }

    printk("CPU %s (id 0x%08lx) ", cpu->name, idcode);

    if (cpu->map_io == NULL || cpu->init == NULL) {
        printk(KERN_ERR "CPU %s support not enabled ", cpu->name);
        panic("Unsupported S3C24XX CPU");
    }

    (cpu->map_io)(mach_desc, size); /* s3c6410_map_io() */
}

//arch/arm/mach-smdk6410.c
static void __init smdk6410_map_io(void)
{
    s3c24xx_init_io(smdk6410_iodesc, ARRAY_SIZE(smdk6410_iodesc));
    ........................;
}

流程如下：
先是板卡及的map_io():smdk6410_map_io()然后经过s3c_lookup_cpu()后转为cpu级的map_io()==s3c6410_map_io()
start_kernel()==>setup_arch()==>
1.mdesc=setup_machine()==>lookup_machine_types(MACH_TYPE_SMDK6410) == __mach_desc_SMDK6410
2.paging_init(mdesc)==>devicemaps_init(mdesc)==>mdesc->map_io()==>__mach_desc_SMDK6410->map_io()
    ==>smdk6410_map_io()==>s3c24xx_init_io()==>s3c6410_map_io()

#if !defined(CONFIG_MACH_SMDK6430)
MACHINE_START(SMDK6410, "SMDK6410")
#else
MACHINE_START(SMDK6430, "SMDK6430")
#endif
    /* Maintainer: Samsung Electronics */
    .phys_io    = S3C24XX_PA_UART,
    ...................,

    .init_irq   = s3c_init_irq,
    .map_io     = smdk6410_map_io,
    .fixup      = smdk6410_fixup,
    .timer      = &s3c_timer,
    .init_machine   = smdk6410_machine_init,
MACHINE_END