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/*
* Atheros AR7xxx/AR9xxx SoC early printk support
*
* Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
*
* 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.
*/
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/serial_reg.h>
#include <asm/addrspace.h>
#include <asm/mach-ar71xx/ar71xx.h>
static void __iomem *prom_uart_base;
static void (*_putchar)(unsigned char);
#define UART_READ(r) \
__raw_readl(prom_uart_base + 4 * (r))
#define UART_WRITE(r, v) \
__raw_writel((v), prom_uart_base + 4 * (r))
static void prom_putchar_ar71xx(unsigned char ch)
{
while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0)
;
UART_WRITE(UART_TX, ch);
while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0)
;
}
static void prom_putchar_ar933x(unsigned char ch)
{
while (((UART_READ(0)) & 0x200) == 0)
;
UART_WRITE(0, 0x200 | ch);
while (((UART_READ(0)) & 0x200) == 0)
;
}
static int prom_putchar_init(void)
{
if (_putchar)
return 0;
switch(ar71xx_soc) {
case AR71XX_SOC_AR7130:
case AR71XX_SOC_AR7141:
case AR71XX_SOC_AR7161:
case AR71XX_SOC_AR7240:
case AR71XX_SOC_AR7241:
case AR71XX_SOC_AR7242:
case AR71XX_SOC_AR9130:
case AR71XX_SOC_AR9132:
case AR71XX_SOC_AR9341:
case AR71XX_SOC_AR9342:
case AR71XX_SOC_AR9344:
prom_uart_base = (void __iomem *) KSEG1ADDR(AR71XX_UART_BASE);
_putchar = prom_putchar_ar71xx;
break;
case AR71XX_SOC_AR9330:
case AR71XX_SOC_AR9331:
prom_uart_base = (void __iomem *) KSEG1ADDR(AR933X_UART_BASE);
_putchar = prom_putchar_ar933x;
break;
default:
return -ENODEV;
}
return 0;
}
void prom_putchar(unsigned char ch)
{
if (prom_putchar_init())
return;
_putchar(ch);
}
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