diff options
Diffstat (limited to 'arch/mips/pmc-sierra/yosemite/dbg_io.c')
| -rw-r--r-- | arch/mips/pmc-sierra/yosemite/dbg_io.c | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/arch/mips/pmc-sierra/yosemite/dbg_io.c b/arch/mips/pmc-sierra/yosemite/dbg_io.c new file mode 100644 index 00000000000..0f659c9106a --- /dev/null +++ b/arch/mips/pmc-sierra/yosemite/dbg_io.c @@ -0,0 +1,180 @@ +/* + * 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; +} |