PS2STAT
if (readl_relaxed(ps2if->base + PS2STAT) & PS2STAT_TXE) {
val = readl_relaxed(ps2if->base + PS2STAT);
status = readl_relaxed(ps2if->base + PS2STAT);
writel_relaxed(PS2STAT_STP, ps2if->base + PS2STAT);
status = readl_relaxed(ps2if->base + PS2STAT);
status = readl_relaxed(ps2if->base + PS2STAT);