/*
* Copyright 2003 PMC-Sierra
* Author: Manish Lachwani (lachwani@pmc-sierra.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.
*/
/*
* Support for KGDB for the Yosemite board. We make use of single serial
* port to be used for KGDB as well as console. The second serial port
* seems to be having a problem. Single IRQ is allocated for both the
* ports. Hence, the interrupt routing code needs to figure out whether
* the interrupt came from channel A or B.
*/
#include <asm/serial.h>
/*
* Baud rate, Parity, Data and Stop bit settings for the
* serial port on the Yosemite. Note that the Early printk
* patch has been added. So, we should be all set to go
*/
#define YOSEMITE_BAUD_2400 2400
#define YOSEMITE_BAUD_4800 4800
#define YOSEMITE_BAUD_9600 9600
#define YOSEMITE_BAUD_19200 19200
#define YOSEMITE_BAUD_38400 38400
#define YOSEMITE_BAUD_57600 57600
#define YOSEMITE_BAUD_115200 115200
#define YOSEMITE_PARITY_NONE 0
#define YOSEMITE_PARITY_ODD 0x08
#define YOSEMITE_PARITY_EVEN 0x18
#define YOSEMITE_PARITY_MARK 0x28
#define YOSEMITE_PARITY_SPACE 0x38
#define YOSEMITE_DATA_5BIT 0x0
#define YOSEMITE_DATA_6BIT 0x1
#define YOSEMITE_DATA_7BIT 0x2
#define YOSEMITE_DATA_8BIT 0x3
#define YOSEMITE_STOP_1BIT 0x0
#define YOSEMITE_STOP_2BIT 0x4
/* This is crucial */
#define SERIAL_REG_OFS 0x1
#define SERIAL_RCV_BUFFER 0x0
#define SERIAL_TRANS_HOLD 0x0
#define SERIAL_SEND_BUFFER 0x0
#define SERIAL_INTR_ENABLE (1 * SERIAL_REG_OFS)
#define SERIAL_INTR_ID (2 * SERIAL_REG_OFS)
#define SERIAL_DATA_FORMAT (3 * SERIAL_REG_OFS)
#define SERIAL_LINE_CONTROL (3 * SERIAL_REG_OFS)
#define SERIAL_MODEM_CONTROL (4 * SERIAL_REG_OFS)
#define SERIAL_RS232_OUTPUT (4 * SERIAL_REG_OFS)
#define SERIAL_LINE_STATUS (5 * SERIAL_REG_OFS)
#define SERIAL_MODEM_STATUS (6 * SERIAL_REG_OFS)
#define SERIAL_RS232_INPUT (6 * SERIAL_REG_OFS)
#define SERIAL_SCRATCH_PAD (7 * SERIAL_REG_OFS)
#define SERIAL_DIVISOR_LSB (0 * SERIAL_REG_OFS)
#define SERIAL_DIVISOR_MSB (1 * SERIAL_REG_OFS)
/*
* Functions to READ and WRITE to serial port 0
*/
#define SERIAL_READ(ofs) (*((volatile unsigned char*) \
(TITAN_SERIAL_BASE + ofs)))
#define SERIAL_WRITE(ofs, val) ((*((volatile unsigned char*) \
(TITAN_SERIAL_BASE + ofs))) = val)
/*
* Functions to READ and WRITE to serial port 1
*/
#define SERIAL_READ_1(ofs) (*((volatile unsigned char*) \
(TITAN_SERIAL_BASE_1 + ofs)
#define SERIAL_WRITE_1(ofs, val) ((*((volatile unsigned char*) \
(TITAN_SERIAL_BASE_1 + ofs))) = val)
/*
* Second serial port initialization
*/
void init_second_port(void)
{
/* Disable Interrupts */
SERIAL_WRITE_1(SERIAL_LINE_CONTROL, 0x0);
SERIAL_WRITE_1(SERIAL_INTR_ENABLE, 0x0);
{
unsigned int divisor;
SERIAL_WRITE_1(SERIAL_LINE_CONTROL, 0x80);
divisor = TITAN_SERIAL_BASE_BAUD / YOSEMITE_BAUD_115200;
SERIAL_WRITE_1(SERIAL_DIVISOR_LSB, divisor & 0xff);
SERIAL_WRITE_1(SERIAL_DIVISOR_MSB,
(divisor & 0xff00) >> 8);
SERIAL_WRITE_1(SERIAL_LINE_CONTROL, 0x0);
}
SERIAL_WRITE_1(SERIAL_DATA_FORMAT, YOSEMITE_DATA_8BIT |
YOSEMITE_PARITY_NONE | YOSEMITE_STOP_1BIT);
/* Enable Interrupts */
SERIAL_WRITE_1(SERIAL_INTR_ENABLE, 0xf);
}
/* Initialize the serial port for KGDB debugging */
void debugInit(unsigned int baud, unsigned char data, unsigned char parity,
unsigned char stop)
{
/* Disable Interrupts */
SERIAL_WRITE(SERIAL_LINE_CONTROL, 0x0);
SERIAL_WRITE(SERIAL_INTR_ENABLE, 0x0);
{
unsigned int divisor;
SERIAL_WRITE(SERIAL_LINE_CONTROL, 0x80);
divisor = TITAN_SERIAL_BASE_BAUD / baud;
SERIAL_WRITE(SERIAL_DIVISOR_LSB, divisor & 0xff);
SERIAL_WRITE(SERIAL_DIVISOR_MSB, (divisor & 0xff00) >> 8);
SERIAL_WRITE(SERIAL_LINE_CONTROL, 0x0);
}
SERIAL_WRITE(SERIAL_DATA_FORMAT, data | parity | stop);
}
static int remoteDebugInitialized = 0;
unsigned char getDebugChar(void)
{
if (!remoteDebugInitialized) {
remoteDebugInitialized = 1;
debugInit(YOSEMITE_BAUD_115200,
YOSEMITE_DATA_8BIT,
YOSEMITE_PARITY_NONE, YOSEMITE_STOP_1BIT);
}
while ((SERIAL_READ(SERIAL_LINE_STATUS) & 0x1) == 0);
return SERIAL_READ(SERIAL_RCV_BUFFER);
}
int putDebugChar(unsigned char byte)
{
if (!remoteDebugInitialized) {
remoteDebugInitialized = 1;
debugInit(YOSEMITE_BAUD_115200,
YOSEMITE_DATA_8BIT,
YOSEMITE_PARITY_NONE, YOSEMITE_STOP_1BIT);
}
while ((SERIAL_READ(SERIAL_LINE_STATUS) & 0x20) == 0);
SERIAL_WRITE(SERIAL_SEND_BUFFER, byte);
return 1;
}
