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
13#include "devices.h"
14#include "ar2315_regs.h"
15#include "ar5312_regs.h"
16
17static inline void prom_uart_wr(void __iomem *base, unsigned reg,
18				unsigned char ch)
19{
20	__raw_writel(ch, base + 4 * reg);
21}
22
23static inline unsigned char prom_uart_rr(void __iomem *base, unsigned reg)
24{
25	return __raw_readl(base + 4 * reg);
26}
27
28void prom_putchar(unsigned char ch)
29{
30	static void __iomem *base;
31
32	if (unlikely(base == NULL)) {
33		if (is_ar2315())
34			base = (void __iomem *)(KSEG1ADDR(AR2315_UART0_BASE));
35		else
36			base = (void __iomem *)(KSEG1ADDR(AR5312_UART0_BASE));
37	}
38
39	while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
40		;
41	prom_uart_wr(base, UART_TX, ch);
42	while ((prom_uart_rr(base, UART_LSR) & UART_LSR_THRE) == 0)
43		;
44}
45