1/*
 2 * This file is subject to the terms and conditions of the GNU General Public
 3 * License.  See the file "COPYING" in the main directory of this archive
 4 * for more details.
 5 *
 6 * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
 7 */
 8
 9#include <linux/mm.h>
10#include <linux/io.h>
11#include <linux/serial_reg.h>
12#include <asm/setup.h>
13
14#include "devices.h"
15#include "ar2315_regs.h"
16#include "ar5312_regs.h"
17
18static inline void prom_uart_wr(void __iomem *base, unsigned reg,
19				unsigned char ch)
20{
21	__raw_writel(ch, base + 4 * reg);
22}
23
24static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)
25{
26	return __raw_readl(base + 4 * reg);
27}
28
29void prom_putchar(char ch)
30{
31	static void __iomem *base;
32
33	if (unlikely(base == NULL)) {
34		if (is_ar2315())
35			base = (void __iomem *)(KSEG1ADDR(AR2315_UART0_BASE));
36		else
37			base = (void __iomem *)(KSEG1ADDR(AR5312_UART0_BASE));
38	}
39
40	while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
41		;
42	prom_uart_wr(base, UART_TX, (unsigned char)ch);
43	while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
44		;
45}