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added rx support

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git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1410 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Greg Watson
2004-03-13 03:40:51 +00:00
parent 5c51c3d9d9
commit e54d55b9d9
7 changed files with 60 additions and 1 deletions
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14
src/lib/uart8250.c
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@@ -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;