1 #include <lib.h> /* Prototypes */
3 #include "pc80/mc146818rtc.h"
4 #if CONFIG_USE_OPTION_TABLE
5 #include "option_table.h"
9 #ifndef CONFIG_TTYS0_BASE
10 #define CONFIG_TTYS0_BASE 0x3f8
13 #ifndef CONFIG_TTYS0_BAUD
14 #define CONFIG_TTYS0_BAUD 115200
17 #if ((115200%CONFIG_TTYS0_BAUD) != 0)
18 #error Bad ttys0 baud rate
21 #ifndef CONFIG_TTYS0_DIV
22 #define CONFIG_TTYS0_DIV (115200/CONFIG_TTYS0_BAUD)
25 /* Line Control Settings */
26 #ifndef CONFIG_TTYS0_LCS
27 /* Set 8bit, 1 stop bit, no parity */
28 #define CONFIG_TTYS0_LCS 0x3
31 #define UART_LCS CONFIG_TTYS0_LCS
34 #if CONFIG_CACHE_AS_RAM == 0
54 static int uart_can_tx_byte(void)
56 return inb(CONFIG_TTYS0_BASE + UART_LSR) & 0x20;
59 static void uart_wait_to_tx_byte(void)
61 while(!uart_can_tx_byte())
65 static void uart_wait_until_sent(void)
67 while(!(inb(CONFIG_TTYS0_BASE + UART_LSR) & 0x40))
71 static void uart_tx_byte(unsigned char data)
73 uart_wait_to_tx_byte();
74 outb(data, CONFIG_TTYS0_BASE + UART_TBR);
75 /* Make certain the data clears the fifos */
76 uart_wait_until_sent();
81 /* disable interrupts */
82 outb(0x0, CONFIG_TTYS0_BASE + UART_IER);
84 outb(0x01, CONFIG_TTYS0_BASE + UART_FCR);
85 /* Set Baud Rate Divisor to 12 ==> 115200 Baud */
86 outb(0x80 | UART_LCS, CONFIG_TTYS0_BASE + UART_LCR);
87 #if CONFIG_USE_OPTION_TABLE
88 static const unsigned char divisor[] = { 1,2,3,6,12,24,48,96 };
89 unsigned ttys0_div, ttys0_index;
90 ttys0_index = read_option(CMOS_VSTART_baud_rate, CMOS_VLEN_baud_rate, 0);
92 ttys0_div = divisor[ttys0_index];
93 outb(ttys0_div & 0xff, CONFIG_TTYS0_BASE + UART_DLL);
94 outb(0, CONFIG_TTYS0_BASE + UART_DLM);
96 outb(CONFIG_TTYS0_DIV & 0xFF, CONFIG_TTYS0_BASE + UART_DLL);
97 outb((CONFIG_TTYS0_DIV >> 8) & 0xFF, CONFIG_TTYS0_BASE + UART_DLM);
99 outb(UART_LCS, CONFIG_TTYS0_BASE + UART_LCR);
103 /* CONFIG_CACHE_AS_RAM == 1 */
105 extern void uart8250_init(unsigned base_port, unsigned divisor, unsigned lcs);
108 #if CONFIG_USE_OPTION_TABLE
109 static const unsigned char divisor[] = { 1,2,3,6,12,24,48,96 };
110 unsigned ttys0_div, ttys0_index;
111 ttys0_index = read_option(CMOS_VSTART_baud_rate, CMOS_VLEN_baud_rate, 0);
113 ttys0_div = divisor[ttys0_index];
114 uart8250_init(CONFIG_TTYS0_BASE, ttys0_div, UART_LCS);
116 uart8250_init(CONFIG_TTYS0_BASE, CONFIG_TTYS0_DIV, UART_LCS);