48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*
|
|
* Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/serial_reg.h>
|
|
|
|
#include <asm/addrspace.h>
|
|
|
|
#ifdef CONFIG_SOC_RT288X
|
|
#define EARLY_UART_BASE 0x300c00
|
|
#else
|
|
#define EARLY_UART_BASE 0x10000c00
|
|
#endif
|
|
|
|
#define UART_REG_RX 0x00
|
|
#define UART_REG_TX 0x04
|
|
#define UART_REG_IER 0x08
|
|
#define UART_REG_IIR 0x0c
|
|
#define UART_REG_FCR 0x10
|
|
#define UART_REG_LCR 0x14
|
|
#define UART_REG_MCR 0x18
|
|
#define UART_REG_LSR 0x1c
|
|
|
|
static __iomem void *uart_membase = (__iomem void *) KSEG1ADDR(EARLY_UART_BASE);
|
|
|
|
static inline void uart_w32(u32 val, unsigned reg)
|
|
{
|
|
__raw_writel(val, uart_membase + reg);
|
|
}
|
|
|
|
static inline u32 uart_r32(unsigned reg)
|
|
{
|
|
return __raw_readl(uart_membase + reg);
|
|
}
|
|
|
|
void prom_putchar(unsigned char ch)
|
|
{
|
|
while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
|
|
;
|
|
uart_w32(ch, UART_REG_TX);
|
|
while ((uart_r32(UART_REG_LSR) & UART_LSR_THRE) == 0)
|
|
;
|
|
}
|