tiny4412 led_ioremap test

//led_test.c
#include  //
#include  //printk
#include 
#include  //ioremap
typedef unsigned int u32;
typedef unsigned char u8;
#define LED_CON (*(volatile u32*)led_reg)
#define LED_DAT (*(volatile u32*)led_reg + 4))

static u32 led_reg;
static void led_init(void)
{
    //相应GPIO设置为输出模式;
    //先将0～3的管脚先清零，再置1; 
    LED_CON = (LED_CON & ~0xffff) | 0x1111;
}
static void led_on(u8 status)
{
    LED_DAT = (LED_DAT & ~0xf) | (status & 0xf);
}

static int led_module_init(void)
{
    printk("===== NOW ioremap test init\n");
    //进行ioremap
    led_reg = (u32)ioremap(0x110002e0, 8);
    led_init();
    led_on(0b1010);
    return 0;
}
static void led_module_exit(void)
{
    printk("==== NOW ioremap test exit\n");
    led_on(0x0000);
    //别忘了释放资源
    iounmap((void*)led_reg);
}
module_init(led_module_init);
module_exit(led_module_exit);
MODULE_LICENSE("GPL")

编译好模块后就可以进行测试了：
insmod led_test.ko
lsmod
rmmod led_test