WPCM450_GPEVEN
even = ioread32(pctrl->gpio_base + WPCM450_GPEVEN);
iowrite32(even, pctrl->gpio_base + WPCM450_GPEVEN);
even = ioread32(pctrl->gpio_base + WPCM450_GPEVEN);
iowrite32(even, pctrl->gpio_base + WPCM450_GPEVEN);
pending &= ioread32(pctrl->gpio_base + WPCM450_GPEVEN);