blob: 650f46d272befecae7bfc3d1be7247a4a7375e15 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <asm/io.h>
#include <asm/system.h>
#include <prom.h>
#include <platform.h>
void __init prom_console_init(void)
{
/* 8 bits, 1 stop bit, no parity. */
REG8(UART0_LCR) = CHAR_LEN_8 | ONE_STOP | PARITY_DISABLE;
/* Reset/Enable the FIFO */
REG8(UART0_FCR) = FCR_EN | RXRST | TXRST | CHAR_TRIGGER_14;
/* Disable All Interrupts */
REG8(UART0_IER) = 0x00000000;
/* Enable Divisor Latch */
REG8(UART0_LCR) |= DLAB;
/* Set Divisor */
REG8(UART0_DLL) = (SYSCLK / (BAUDRATE * 16) - 1) & 0x00FF;
REG8(UART0_DLM) = ((SYSCLK / (BAUDRATE * 16) - 1) & 0xFF00) >> 8;
/* Disable Divisor Latch */
REG8(UART0_LCR) &= (~DLAB);
}
int prom_putchar(char c)
{
unsigned int busy_cnt = 0;
do
{
/* Prevent Hanging */
if (busy_cnt++ >= 30000)
{
/* Reset Tx FIFO */
REG8(UART0_FCR) = TXRST | CHAR_TRIGGER_14;
return 0;
}
} while ((REG8(UART0_LSR) & LSR_THRE) == TxCHAR_AVAIL);
/* Send Character */
REG8(UART0_THR) = c;
return 1;
}
|
