P50_PORT_CMD
val = inb(p50->base + P50_PORT_CMD) & mask;
outb(P50_CMD_READ | reg, p50->base + P50_PORT_CMD);
outb(P50_CMD_WRITE | reg, p50->base + P50_PORT_CMD);
struct resource res = DEFINE_RES_IO(P50_GPIO_IO_PORT_BASE, P50_PORT_CMD + 1);