JZ_GPIO_PAT0S
reg += (level == 0) ? JZ_GPIO_PAT0C : JZ_GPIO_PAT0S;
writereg(reg + JZ_GPIO_PAT0S, mask);
writereg(reg + JZ_GPIO_PAT0S, mask);
writereg(reg + JZ_GPIO_PAT0S, mask); /* trigger on high */