插入代码效果

 1 static void nuc900_gpio_core_set(struct gpio_chip *gc, unsigned gpio_num,
 2                  int val)
 3 {
 4     int port_num, value;
 5     const struct gpio_port *port =
 6         nuc900_gpio_cla_port(gpio_num, &port_num);
 7     spin_lock(&gpio_lock);
 8     if ((__raw_readl(port->dir) & (1 << port_num))) {    //GPIO OUT    
 9         value = __raw_readl(port->out);
10         if (val)
11             value |= (1 << port_num);
12         else
13             value &= ~(1 << port_num);
14         nuc900_gpio_debug("out value=0x%08x\n", value);
15         __raw_writel(value, port->out);
16 
17     } else {        //GPIO IN
18         value = __raw_readl(port->in);
19         if (val)
20             value |= (1 << port_num);
21         else
22             value &= ~(1 << port_num);
23         nuc900_gpio_debug("in value=0x%08x\n", value);
24         __raw_writel(value, port->in);;
25     }
26 
27     spin_unlock(&gpio_lock);
28 }
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