diff options
Diffstat (limited to 'src/drivers/uart/pl011.c')
| -rw-r--r-- | src/drivers/uart/pl011.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/drivers/uart/pl011.c b/src/drivers/uart/pl011.c index 64c279d1b449..06782a3b980f 100644 --- a/src/drivers/uart/pl011.c +++ b/src/drivers/uart/pl011.c @@ -7,6 +7,38 @@ void uart_init(unsigned int idx) { + struct pl011_uart *regs = uart_platform_baseptr(idx); + uint32_t tmp; + + if (!regs) + return; + + /* Disable UART */ + tmp = read32(®s->cr); + tmp &= ~PL011_UARTCR_UARTEN; + write32(®s->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(®s->ibrd, tmp >> 6); + write32(®s->fbrd, tmp & 0x3f); + + /* Program LINE Control 8n1, FIFO enable */ + tmp = read32(®s->lcr_h); + tmp |= PL011_LINE_CONTROL; + write32(®s->lcr_h, tmp); + + /* Enable UART */ + tmp = read32(®s->cr); + tmp |= PL011_UARTCR_UARTEN | PL011_UARTCR_RXE | PL011_UARTCR_TXE; + write32(®s->cr, tmp); } void uart_tx_byte(unsigned int idx, unsigned char data) |