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| author | Greg Watson <jarrah@users.sourceforge.net> | 2004-03-13 03:40:51 +0000 |
|---|---|---|
| committer | Greg Watson <jarrah@users.sourceforge.net> | 2004-03-13 03:40:51 +0000 |
| commit | e54d55b9d935745c2aa3f07712b857af42506c0d (patch) | |
| tree | efe0e500105ceaa5aed882f52329fb6a5e675a75 /src/lib/uart8250.c | |
| parent | 5c51c3d9d945ae77c93073db5624728959cf4c74 (diff) | |
| download | coreboot-e54d55b9d935745c2aa3f07712b857af42506c0d.tar.xz | |
added rx support
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1410 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/lib/uart8250.c')
| -rw-r--r-- | src/lib/uart8250.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/lib/uart8250.c b/src/lib/uart8250.c index 67b0a95cfb..e3a1255dc6 100644 --- a/src/lib/uart8250.c +++ b/src/lib/uart8250.c @@ -20,7 +20,7 @@ #define UART_MSR 0x06 #define UART_SCR 0x07 -static inline int uart8250_can_tx_byte(unsigned base_port) +static int uart8250_can_tx_byte(unsigned base_port) { return inb(base_port + UART_LSR) & 0x20; } @@ -45,6 +45,18 @@ void uart8250_tx_byte(unsigned base_port, unsigned char data) uart8250_wait_until_sent(base_port); } +int uart8250_can_rx_byte(unsigned base_port) +{ + return inb(base_port + UART_LSR) & 0x01; +} + +unsigned char uart8250_rx_byte(unsigned base_port) +{ + while(!uart8250_can_rx_byte(base_port)) + ; + return inb(base_port + UART_RBR); +} + void uart8250_init(unsigned base_port, unsigned divisor, unsigned lcs) { lcs &= 0x7f; |