Function uart_init

src/drivers/uart/pl011.c:8–42

#include <drivers/uart/pl011.h>

void uart_init(unsigned int idx)
{
	struct pl011_uart *regs = uart_platform_baseptr(idx);
	uint32_t tmp;

	if (!regs)
		return;

	/* Disable UART */
	tmp = read32(&regs->cr);
	tmp &= ~PL011_UARTCR_UARTEN;
	write32(&regs->cr, tmp);

	/*
	 * Program Divisor
	 * As per: PL011 Technical reference manual:
	 * BAUDDIV = (Fuartclk / (16 * baud_rate))
	 * Considering 6 bits(64) for UARTFBRD
	 * BAUDDIV = (Fuartclk * 4 / baud_rate)
	 */
	tmp = uart_platform_refclk() * 4 / get_uart_baudrate();

	write32(&regs->ibrd, tmp >> 6);
	write32(&regs->fbrd, tmp & 0x3f);

	/* Program LINE Control 8n1, FIFO enable */
	tmp = read32(&regs->lcr_h);
	tmp |= PL011_LINE_CONTROL;
	write32(&regs->lcr_h, tmp);

	/* Enable UART */
	tmp = read32(&regs->cr);
	tmp |= PL011_UARTCR_UARTEN | PL011_UARTCR_RXE | PL011_UARTCR_TXE;
	write32(&regs->cr, tmp);
}

void uart_tx_byte(unsigned int idx, unsigned char data)
{