From 8ca8d7665d671e10d72b8fcb4d69121d75f7906e Mon Sep 17 00:00:00 2001 From: Eric Biederman Date: Tue, 22 Apr 2003 19:02:15 +0000 Subject: - Initial checkin of the freebios2 tree git-svn-id: svn://svn.coreboot.org/coreboot/trunk@784 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1 --- src/console/uart8250_console.c | 49 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 src/console/uart8250_console.c (limited to 'src/console/uart8250_console.c') diff --git a/src/console/uart8250_console.c b/src/console/uart8250_console.c new file mode 100644 index 0000000000..6eeeb6aa55 --- /dev/null +++ b/src/console/uart8250_console.c @@ -0,0 +1,49 @@ +#include +#include +#include + +/* Base Address */ +#ifndef TTYS0_BASE +#define TTYS0_BASE 0x3f8 +#endif + +#ifndef TTYS0_BAUD +#define TTYS0_BAUD 115200 +#endif + +#if ((115200%TTYS0_BAUD) != 0) +#error Bad ttys0 baud rate +#endif + +#define TTYS0_DIV (115200/TTYS0_BAUD) + +/* Line Control Settings */ +#ifndef TTYS0_LCS +/* Set 8bit, 1 stop bit, no parity */ +#define TTYS0_LCS 0x3 +#endif + +#define UART_LCS TTYS0_LCS + +void ttyS0_init(void) +{ + static unsigned char div[8]={1,2,3,6,12,24,48,96}; + int b_index=0; + unsigned int divisor=TTYS0_DIV; + + if(get_option(&b_index,"baud_rate")==0) { + divisor=div[b_index]; + } + uart8250_init(TTYS0_BASE, divisor, TTYS0_LCS); +} + +void ttyS0_tx_byte(unsigned char data) +{ + uart8250_tx_byte(TTYS0_BASE, data); +} + +static struct console_driver uart8250_console __console = { + .init = ttyS0_init, + .tx_byte = ttyS0_tx_byte, +}; + -- cgit v1.2.3