#include <part/fallback_boot.h> /* 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 #if CONFIG_USE_PRINTK_IN_CAR == 0 /* Data */ #define UART_RBR 0x00 #define UART_TBR 0x00 /* Control */ #define UART_IER 0x01 #define UART_IIR 0x02 #define UART_FCR 0x02 #define UART_LCR 0x03 #define UART_MCR 0x04 #define UART_DLL 0x00 #define UART_DLM 0x01 /* Status */ #define UART_LSR 0x05 #define UART_MSR 0x06 #define UART_SCR 0x07 static int uart_can_tx_byte(void) { return inb(TTYS0_BASE + UART_LSR) & 0x20; } static void uart_wait_to_tx_byte(void) { while(!uart_can_tx_byte()) ; } static void uart_wait_until_sent(void) { while(!(inb(TTYS0_BASE + UART_LSR) & 0x40)) ; } static void uart_tx_byte(unsigned char data) { uart_wait_to_tx_byte(); outb(data, TTYS0_BASE + UART_TBR); /* Make certain the data clears the fifos */ uart_wait_until_sent(); } static void uart_init(void) { /* disable interrupts */ outb(0x0, TTYS0_BASE + UART_IER); /* enable fifo's */ outb(0x01, TTYS0_BASE + UART_FCR); /* Set Baud Rate Divisor to 12 ==> 115200 Baud */ outb(0x80 | UART_LCS, TTYS0_BASE + UART_LCR); #if USE_OPTION_TABLE == 1 static const unsigned char divisor[] = { 1,2,3,6,12,24,48,96 }; unsigned ttys0_div, ttys0_index; ttys0_index = read_option(CMOS_VSTART_baud_rate, CMOS_VLEN_baud_rate, 0); ttys0_index &= 7; ttys0_div = divisor[ttys0_index]; outb(ttys0_div & 0xff, TTYS0_BASE + UART_DLL); outb(0, TTYS0_BASE + UART_DLM); #else outb(TTYS0_DIV & 0xFF, TTYS0_BASE + UART_DLL); outb((TTYS0_DIV >> 8) & 0xFF, TTYS0_BASE + UART_DLM); #endif outb(UART_LCS, TTYS0_BASE + UART_LCR); } #else #include "../lib/uart8250.c" extern void uart8250_init(unsigned base_port, unsigned divisor, unsigned lcs); static void uart_init(void) { #if USE_OPTION_TABLE == 1 static const unsigned char divisor[] = { 1,2,3,6,12,24,48,96 }; unsigned ttys0_div, ttys0_index; ttys0_index = read_option(CMOS_VSTART_baud_rate, CMOS_VLEN_baud_rate, 0); ttys0_index &= 7; ttys0_div = divisor[ttys0_index]; uart8250_init(TTYS0_BASE, ttys0_div, UART_LCS); #else uart8250_init(TTYS0_BASE, TTYS0_DIV, UART_LCS); #endif } #endif