AT91_SHDW_MR
writel(wakeup_mode | mode, at91_shdwc.shdwc_base + AT91_SHDW_MR);
writel(mode, shdw->shdwc_base + AT91_SHDW_MR);
writel(0, shdw->shdwc_base + AT91_SHDW_MR);