mydebug.h

put it in “include/linux” #include linux/mydebug.h>

#define __MYDEBUG__
#ifdef __MYDEBUG__ 
#define MYDEBUG(format,...) printk("File: "__FILE__", Line: %05d: "format"\n", __LINE__, ##__VA_ARGS__) 
#else 
#define MYDEBUG(format,...) 
#endif 

MYDEBUG("dev name is %s", dev_name(&pdev->dev));
static inline const char *dev_name(const struct device *dev)
{
    /* Use the init name until the kobject becomes available */
    if (dev->init_name)
        return dev->init_name;

    return kobject_name(&dev->kobj);
}

static void rvin_write(struct rvin_dev *vin, u32 value, u32 offset)
{
    iowrite32(value, vin->base + offset);
}

static u32 rvin_read(struct rvin_dev *vin, u32 offset)
{
    return ioread32(vin->base + offset);
}
struct rvin_dev {
    struct device *dev;
    void __iomem *base;
    ......}
    u32 vnmc;

        vnmc = rvin_read(vin, VNMC_REG);
        rvin_write(vin, vnmc & ~(VNMC_SCLE | VNMC_VUP), VNMC_REG);

static int my_read_register(unsigned long addr, size_t size, const char *name)  
{

    void __iomem *p;
    unsigned long value = 0;

//  if (!request_mem_region(addr, size, name)){
//        return -EINVAL;
//  }

        p = ioremap(addr, size);
        if (p) {
            value = ioread32(p);
        }

        iounmap(p);

        return value;
}

    unsigned long vindm;
    unsigned long addr_vindm = 0;

    addr_phyim    = 0xFEAA0184;  
    phyim = my_read_register(addr_phyim, 4, "PHYDIM");
    MYDEBUG("Value of phyim is %x", phyim);
    MYDEBUG("lcnt: %x", ioread32(priv->base + 0x0160));

static void __iomem *baseaddr;  
    if (!request_mem_region(GPJ0CON_PA, 8, "GPJ0BASE"))
        return -EINVAL;
    baseaddr = ioremap(GPJ0CON_PA, 8);

    writel(0x11111111, baseaddr + S5P_GPJ0CON);