ATMEL_PDC_TCR
counter_reg = ATMEL_PDC_TCR;
if (atmel_uart_readl(port, ATMEL_PDC_TCR))
atmel_uart_writel(port, ATMEL_PDC_TCR, count);
atmel_uart_writel(port, ATMEL_PDC_TCR, 0);
writel(block_size / 2, chip->regs + ATMEL_PDC_TCR);
.xcr = ATMEL_PDC_TCR,