1 #include <lib.h> /* Prototypes */
3 #include "pc80/mc146818rtc.h"
6 #ifndef CONFIG_TTYS0_BASE
7 #define CONFIG_TTYS0_BASE 0x3f8
10 #ifndef CONFIG_TTYS0_BAUD
11 #define CONFIG_TTYS0_BAUD 115200
14 #if ((115200%CONFIG_TTYS0_BAUD) != 0)
15 #error Bad ttys0 baud rate
18 #ifndef CONFIG_TTYS0_DIV
19 #define CONFIG_TTYS0_DIV (115200/CONFIG_TTYS0_BAUD)
22 /* Line Control Settings */
23 #ifndef CONFIG_TTYS0_LCS
24 /* Set 8bit, 1 stop bit, no parity */
25 #define CONFIG_TTYS0_LCS 0x3
28 #define UART_LCS CONFIG_TTYS0_LCS
31 #if CONFIG_USE_PRINTK_IN_CAR == 0
51 static int uart_can_tx_byte(void)
53 return inb(CONFIG_TTYS0_BASE + UART_LSR) & 0x20;
56 static void uart_wait_to_tx_byte(void)
58 while(!uart_can_tx_byte())
62 static void uart_wait_until_sent(void)
64 while(!(inb(CONFIG_TTYS0_BASE + UART_LSR) & 0x40))
68 static void uart_tx_byte(unsigned char data)
70 uart_wait_to_tx_byte();
71 outb(data, CONFIG_TTYS0_BASE + UART_TBR);
72 /* Make certain the data clears the fifos */
73 uart_wait_until_sent();
78 /* disable interrupts */
79 outb(0x0, CONFIG_TTYS0_BASE + UART_IER);
81 outb(0x01, CONFIG_TTYS0_BASE + UART_FCR);
82 /* Set Baud Rate Divisor to 12 ==> 115200 Baud */
83 outb(0x80 | UART_LCS, CONFIG_TTYS0_BASE + UART_LCR);
84 #if CONFIG_USE_OPTION_TABLE
85 static const unsigned char divisor[] = { 1,2,3,6,12,24,48,96 };
86 unsigned ttys0_div, ttys0_index;
87 ttys0_index = read_option(CMOS_VSTART_baud_rate, CMOS_VLEN_baud_rate, 0);
89 ttys0_div = divisor[ttys0_index];
90 outb(ttys0_div & 0xff, CONFIG_TTYS0_BASE + UART_DLL);
91 outb(0, CONFIG_TTYS0_BASE + UART_DLM);
93 outb(CONFIG_TTYS0_DIV & 0xFF, CONFIG_TTYS0_BASE + UART_DLL);
94 outb((CONFIG_TTYS0_DIV >> 8) & 0xFF, CONFIG_TTYS0_BASE + UART_DLM);
96 outb(UART_LCS, CONFIG_TTYS0_BASE + UART_LCR);
100 /* CONFIG_USE_PRINTK_IN_CAR == 1 */
102 extern void uart8250_init(unsigned base_port, unsigned divisor, unsigned lcs);
105 #if CONFIG_USE_OPTION_TABLE
106 static const unsigned char divisor[] = { 1,2,3,6,12,24,48,96 };
107 unsigned ttys0_div, ttys0_index;
108 ttys0_index = read_option(CMOS_VSTART_baud_rate, CMOS_VLEN_baud_rate, 0);
110 ttys0_div = divisor[ttys0_index];
111 uart8250_init(CONFIG_TTYS0_BASE, ttys0_div, UART_LCS);
113 uart8250_init(CONFIG_TTYS0_BASE, CONFIG_TTYS0_DIV, UART_LCS);