181 lines
5.5 KiB
C
181 lines
5.5 KiB
C
/*
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* Copyright 2003 PMC-Sierra
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* Author: Manish Lachwani (lachwani@pmc-sierra.com)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* Support for KGDB for the Yosemite board. We make use of single serial
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* port to be used for KGDB as well as console. The second serial port
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* seems to be having a problem. Single IRQ is allocated for both the
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* ports. Hence, the interrupt routing code needs to figure out whether
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* the interrupt came from channel A or B.
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*/
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#include <asm/serial.h>
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/*
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* Baud rate, Parity, Data and Stop bit settings for the
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* serial port on the Yosemite. Note that the Early printk
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* patch has been added. So, we should be all set to go
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*/
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#define YOSEMITE_BAUD_2400 2400
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#define YOSEMITE_BAUD_4800 4800
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#define YOSEMITE_BAUD_9600 9600
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#define YOSEMITE_BAUD_19200 19200
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#define YOSEMITE_BAUD_38400 38400
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#define YOSEMITE_BAUD_57600 57600
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#define YOSEMITE_BAUD_115200 115200
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#define YOSEMITE_PARITY_NONE 0
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#define YOSEMITE_PARITY_ODD 0x08
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#define YOSEMITE_PARITY_EVEN 0x18
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#define YOSEMITE_PARITY_MARK 0x28
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#define YOSEMITE_PARITY_SPACE 0x38
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#define YOSEMITE_DATA_5BIT 0x0
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#define YOSEMITE_DATA_6BIT 0x1
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#define YOSEMITE_DATA_7BIT 0x2
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#define YOSEMITE_DATA_8BIT 0x3
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#define YOSEMITE_STOP_1BIT 0x0
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#define YOSEMITE_STOP_2BIT 0x4
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/* This is crucial */
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#define SERIAL_REG_OFS 0x1
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#define SERIAL_RCV_BUFFER 0x0
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#define SERIAL_TRANS_HOLD 0x0
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#define SERIAL_SEND_BUFFER 0x0
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#define SERIAL_INTR_ENABLE (1 * SERIAL_REG_OFS)
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#define SERIAL_INTR_ID (2 * SERIAL_REG_OFS)
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#define SERIAL_DATA_FORMAT (3 * SERIAL_REG_OFS)
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#define SERIAL_LINE_CONTROL (3 * SERIAL_REG_OFS)
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#define SERIAL_MODEM_CONTROL (4 * SERIAL_REG_OFS)
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#define SERIAL_RS232_OUTPUT (4 * SERIAL_REG_OFS)
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#define SERIAL_LINE_STATUS (5 * SERIAL_REG_OFS)
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#define SERIAL_MODEM_STATUS (6 * SERIAL_REG_OFS)
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#define SERIAL_RS232_INPUT (6 * SERIAL_REG_OFS)
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#define SERIAL_SCRATCH_PAD (7 * SERIAL_REG_OFS)
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#define SERIAL_DIVISOR_LSB (0 * SERIAL_REG_OFS)
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#define SERIAL_DIVISOR_MSB (1 * SERIAL_REG_OFS)
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/*
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* Functions to READ and WRITE to serial port 0
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*/
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#define SERIAL_READ(ofs) (*((volatile unsigned char*) \
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(TITAN_SERIAL_BASE + ofs)))
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#define SERIAL_WRITE(ofs, val) ((*((volatile unsigned char*) \
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(TITAN_SERIAL_BASE + ofs))) = val)
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/*
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* Functions to READ and WRITE to serial port 1
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*/
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#define SERIAL_READ_1(ofs) (*((volatile unsigned char*) \
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(TITAN_SERIAL_BASE_1 + ofs)))
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#define SERIAL_WRITE_1(ofs, val) ((*((volatile unsigned char*) \
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(TITAN_SERIAL_BASE_1 + ofs))) = val)
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/*
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* Second serial port initialization
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*/
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void init_second_port(void)
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{
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/* Disable Interrupts */
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SERIAL_WRITE_1(SERIAL_LINE_CONTROL, 0x0);
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SERIAL_WRITE_1(SERIAL_INTR_ENABLE, 0x0);
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{
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unsigned int divisor;
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SERIAL_WRITE_1(SERIAL_LINE_CONTROL, 0x80);
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divisor = TITAN_SERIAL_BASE_BAUD / YOSEMITE_BAUD_115200;
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SERIAL_WRITE_1(SERIAL_DIVISOR_LSB, divisor & 0xff);
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SERIAL_WRITE_1(SERIAL_DIVISOR_MSB,
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(divisor & 0xff00) >> 8);
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SERIAL_WRITE_1(SERIAL_LINE_CONTROL, 0x0);
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}
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SERIAL_WRITE_1(SERIAL_DATA_FORMAT, YOSEMITE_DATA_8BIT |
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YOSEMITE_PARITY_NONE | YOSEMITE_STOP_1BIT);
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/* Enable Interrupts */
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SERIAL_WRITE_1(SERIAL_INTR_ENABLE, 0xf);
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}
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/* Initialize the serial port for KGDB debugging */
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void debugInit(unsigned int baud, unsigned char data, unsigned char parity,
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unsigned char stop)
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{
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/* Disable Interrupts */
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SERIAL_WRITE(SERIAL_LINE_CONTROL, 0x0);
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SERIAL_WRITE(SERIAL_INTR_ENABLE, 0x0);
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{
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unsigned int divisor;
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SERIAL_WRITE(SERIAL_LINE_CONTROL, 0x80);
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divisor = TITAN_SERIAL_BASE_BAUD / baud;
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SERIAL_WRITE(SERIAL_DIVISOR_LSB, divisor & 0xff);
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SERIAL_WRITE(SERIAL_DIVISOR_MSB, (divisor & 0xff00) >> 8);
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SERIAL_WRITE(SERIAL_LINE_CONTROL, 0x0);
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}
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SERIAL_WRITE(SERIAL_DATA_FORMAT, data | parity | stop);
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}
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static int remoteDebugInitialized = 0;
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unsigned char getDebugChar(void)
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{
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if (!remoteDebugInitialized) {
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remoteDebugInitialized = 1;
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debugInit(YOSEMITE_BAUD_115200,
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YOSEMITE_DATA_8BIT,
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YOSEMITE_PARITY_NONE, YOSEMITE_STOP_1BIT);
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}
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while ((SERIAL_READ(SERIAL_LINE_STATUS) & 0x1) == 0);
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return SERIAL_READ(SERIAL_RCV_BUFFER);
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}
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int putDebugChar(unsigned char byte)
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{
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if (!remoteDebugInitialized) {
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remoteDebugInitialized = 1;
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debugInit(YOSEMITE_BAUD_115200,
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YOSEMITE_DATA_8BIT,
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YOSEMITE_PARITY_NONE, YOSEMITE_STOP_1BIT);
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}
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while ((SERIAL_READ(SERIAL_LINE_STATUS) & 0x20) == 0);
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SERIAL_WRITE(SERIAL_SEND_BUFFER, byte);
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return 1;
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}
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