5113f6f70
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kernel add
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/*
* Copyright (C) 2008-2010 Thomas Chou <thomas@wytron.com.tw>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <linux/io.h>
#if (defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) && defined(JTAG_UART_BASE))\
|| (defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE) && defined(UART0_BASE))
static void *my_ioremap(unsigned long physaddr)
{
return (void *)(physaddr | CONFIG_NIOS2_IO_REGION_BASE);
}
#endif
#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) && defined(JTAG_UART_BASE)
#define ALTERA_JTAGUART_SIZE 8
#define ALTERA_JTAGUART_DATA_REG 0
#define ALTERA_JTAGUART_CONTROL_REG 4
#define ALTERA_JTAGUART_CONTROL_AC_MSK (0x00000400)
#define ALTERA_JTAGUART_CONTROL_WSPACE_MSK (0xFFFF0000)
static void *uartbase;
#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
static void jtag_putc(int ch)
{
if (readl(uartbase + ALTERA_JTAGUART_CONTROL_REG) &
ALTERA_JTAGUART_CONTROL_WSPACE_MSK)
writeb(ch, uartbase + ALTERA_JTAGUART_DATA_REG);
}
#else
static void jtag_putc(int ch)
{
while ((readl(uartbase + ALTERA_JTAGUART_CONTROL_REG) &
ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0)
;
writeb(ch, uartbase + ALTERA_JTAGUART_DATA_REG);
}
#endif
static int putchar(int ch)
{
jtag_putc(ch);
return ch;
}
static void console_init(void)
{
uartbase = my_ioremap((unsigned long) JTAG_UART_BASE);
writel(ALTERA_JTAGUART_CONTROL_AC_MSK,
uartbase + ALTERA_JTAGUART_CONTROL_REG);
}
#elif defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE) && defined(UART0_BASE)
#define ALTERA_UART_SIZE 32
#define ALTERA_UART_TXDATA_REG 4
#define ALTERA_UART_STATUS_REG 8
#define ALTERA_UART_DIVISOR_REG 16
#define ALTERA_UART_STATUS_TRDY_MSK (0x40)
static unsigned uartbase;
static void uart_putc(int ch)
{
int i;
for (i = 0; (i < 0x10000); i++) {
if (readw(uartbase + ALTERA_UART_STATUS_REG) &
ALTERA_UART_STATUS_TRDY_MSK)
break;
}
writeb(ch, uartbase + ALTERA_UART_TXDATA_REG);
}
static int putchar(int ch)
{
uart_putc(ch);
if (ch == '
')
uart_putc('\r');
return ch;
}
static void console_init(void)
{
unsigned int baud, baudclk;
uartbase = (unsigned long) my_ioremap((unsigned long) UART0_BASE);
baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
baudclk = UART0_FREQ / baud;
writew(baudclk, uartbase + ALTERA_UART_DIVISOR_REG);
}
#else
static int putchar(int ch)
{
return ch;
}
static void console_init(void)
{
}
#endif
static int puts(const char *s)
{
while (*s)
putchar(*s++);
return 0;
}
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