HW_GPIOB_INTMASK
mask = ioread32be(hlwd->regs + HW_GPIOB_INTMASK);
iowrite32be(mask, hlwd->regs + HW_GPIOB_INTMASK);
mask = ioread32be(hlwd->regs + HW_GPIOB_INTMASK);
iowrite32be(mask, hlwd->regs + HW_GPIOB_INTMASK);
iowrite32be(0, hlwd->regs + HW_GPIOB_INTMASK);
pending &= ioread32be(hlwd->regs + HW_GPIOB_INTMASK);