/*
* Copyright 2001 MontaVista Software Inc.
* Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
* Copyright (C) 2000, 2001 Ralf Baechle (ralf@gnu.org)
*
* Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology
* Author: Fuxin Zhang, zhangfx@lemote.com
*
* 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/io.h>
#include <linux/init.h>
#include <linux/types.h>
#include <asm/serial.h>
#define UART16550_BAUD_2400 2400
#define UART16550_BAUD_4800 4800
#define UART16550_BAUD_9600 9600
#define UART16550_BAUD_19200 19200
#define UART16550_BAUD_38400 38400
#define UART16550_BAUD_57600 57600
#define UART16550_BAUD_115200 115200
#define UART16550_PARITY_NONE 0
#define UART16550_PARITY_ODD 0x08
#define UART16550_PARITY_EVEN 0x18
#define UART16550_PARITY_MARK 0x28
#define UART16550_PARITY_SPACE 0x38
#define UART16550_DATA_5BIT 0x0
#define UART16550_DATA_6BIT 0x1
#define UART16550_DATA_7BIT 0x2
#define UART16550_DATA_8BIT 0x3
#define UART16550_STOP_1BIT 0x0
#define UART16550_STOP_2BIT 0x4
/* ----------------------------------------------------- */
/* === CONFIG === */
#ifdef CONFIG_64BIT
#define BASE (0xffffffffbfd003f8)
#else
#define BASE (0xbfd003f8)
#endif
#define MAX_BAUD BASE_BAUD
/* === END OF CONFIG === */
#define REG_OFFSET 1
/* register offset */
#define OFS_RCV_BUFFER 0
#define OFS_TRANS_HOLD 0
#define OFS_SEND_BUFFER 0
#define OFS_INTR_ENABLE (1*REG_OFFSET)
#define OFS_INTR_ID (2*REG_OFFSET)
#define OFS_DATA_FORMAT (3*REG_OFFSET)
#define OFS_LINE_CONTROL (3*REG_OFFSET)
#define OFS_MODEM_CONTROL (4*REG_OFFSET)
#define OFS_RS232_OUTPUT (4*REG_OFFSET)
#define OFS_LINE_STATUS (5*REG_OFFSET)
#define OFS_MODEM_STATUS (6*REG_OFFSET)
#define OFS_RS232_INPUT (6*REG_OFFSET)
#define OFS_SCRATCH_PAD (7*REG_OFFSET)
#define OFS_DIVISOR_LSB (0*REG_OFFSET)
#define OFS_DIVISOR_MSB (1*REG_OFFSET)
/* memory-mapped read/write of the port */
#define UART16550_READ(y) readb((char *)BASE + (y))
#define UART16550_WRITE(y, z) writeb(z, (char *)BASE + (y))
void debugInit(u32 baud, u8 data, u8 parity, u8 stop)
{
u32 divisor;
/* disable interrupts */
UART16550_WRITE(OFS_INTR_ENABLE, 0);
/* set up buad rate */
/* set DIAB bit */
UART16550_WRITE(OFS_LINE_CONTROL, 0x80);
/* set divisor */
divisor = MAX_BAUD / baud;
UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff);
UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00) >> 8);
/* clear DIAB bit */
UART16550_WRITE(OFS_LINE_CONTROL, 0x0);
/* set data format */
UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop);
}
static int remoteDebugInitialized;
u8 getDebugChar(void)
{
if (!remoteDebugInitialized) {
remoteDebugInitialized = 1;
debugInit(UART16550_BAUD_115200,
UART16550_DATA_8BIT,
UART16550_PARITY_NONE, UART16550_STOP_1BIT);
}
while ((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0) ;
return UART16550_READ(OFS_RCV_BUFFER);
}
int putDebugChar(u8 byte)
{
if (!remoteDebugInitialized) {
remoteDebugInitialized = 1;
/*
debugInit(UART16550_BAUD_115200,
UART16550_DATA_8BIT,
UART16550_PARITY_NONE, UART16550_STOP_1BIT); */
}
while ((UART16550_READ(OFS_LINE_STATUS) & 0x20) == 0) ;
UART16550_WRITE(OFS_SEND_BUFFER, byte);
return 1;
}
