(struct goldfish_pipe *pipe, u00 cmd) {  unsigned long flags;  struct goldfish_pipe_dev *dev = pipe->dev;   spin_lock_irqsave(&dev->lock, flags);  gf_write_ptr(pipe, dev->base + PIPE_REG_CHANNEL,        dev->base + PIPE_REG_CHANNEL_HIGH);  writel(cmd, dev->base + PIPE_REG_COMMAND);  s