1/* 2 * Copyright 2003 PMC-Sierra 3 * Author: Manish Lachwani (lachwani@pmc-sierra.com) 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License as published by the 7 * Free Software Foundation; either version 2 of the License, or (at your 8 * option) any later version. 9 * 10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 11 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 13 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 14 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 15 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 16 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 17 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 18 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 19 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 20 * 21 * You should have received a copy of the GNU General Public License along 22 * with this program; if not, write to the Free Software Foundation, Inc., 23 * 675 Mass Ave, Cambridge, MA 02139, USA. 24 */ 25 26/* 27 * Support for KGDB for the Yosemite board. We make use of single serial 28 * port to be used for KGDB as well as console. The second serial port 29 * seems to be having a problem. Single IRQ is allocated for both the 30 * ports. Hence, the interrupt routing code needs to figure out whether 31 * the interrupt came from channel A or B. 32 */ 33 34#include <asm/serial.h> 35 36/* 37 * Baud rate, Parity, Data and Stop bit settings for the 38 * serial port on the Yosemite. Note that the Early printk 39 * patch has been added. So, we should be all set to go 40 */ 41#define YOSEMITE_BAUD_2400 2400 42#define YOSEMITE_BAUD_4800 4800 43#define YOSEMITE_BAUD_9600 9600 44#define YOSEMITE_BAUD_19200 19200 45#define YOSEMITE_BAUD_38400 38400 46#define YOSEMITE_BAUD_57600 57600 47#define YOSEMITE_BAUD_115200 115200 48 49#define YOSEMITE_PARITY_NONE 0 50#define YOSEMITE_PARITY_ODD 0x08 51#define YOSEMITE_PARITY_EVEN 0x18 52#define YOSEMITE_PARITY_MARK 0x28 53#define YOSEMITE_PARITY_SPACE 0x38 54 55#define YOSEMITE_DATA_5BIT 0x0 56#define YOSEMITE_DATA_6BIT 0x1 57#define YOSEMITE_DATA_7BIT 0x2 58#define YOSEMITE_DATA_8BIT 0x3 59 60#define YOSEMITE_STOP_1BIT 0x0 61#define YOSEMITE_STOP_2BIT 0x4 62 63/* This is crucial */ 64#define SERIAL_REG_OFS 0x1 65 66#define SERIAL_RCV_BUFFER 0x0 67#define SERIAL_TRANS_HOLD 0x0 68#define SERIAL_SEND_BUFFER 0x0 69#define SERIAL_INTR_ENABLE (1 * SERIAL_REG_OFS) 70#define SERIAL_INTR_ID (2 * SERIAL_REG_OFS) 71#define SERIAL_DATA_FORMAT (3 * SERIAL_REG_OFS) 72#define SERIAL_LINE_CONTROL (3 * SERIAL_REG_OFS) 73#define SERIAL_MODEM_CONTROL (4 * SERIAL_REG_OFS) 74#define SERIAL_RS232_OUTPUT (4 * SERIAL_REG_OFS) 75#define SERIAL_LINE_STATUS (5 * SERIAL_REG_OFS) 76#define SERIAL_MODEM_STATUS (6 * SERIAL_REG_OFS) 77#define SERIAL_RS232_INPUT (6 * SERIAL_REG_OFS) 78#define SERIAL_SCRATCH_PAD (7 * SERIAL_REG_OFS) 79 80#define SERIAL_DIVISOR_LSB (0 * SERIAL_REG_OFS) 81#define SERIAL_DIVISOR_MSB (1 * SERIAL_REG_OFS) 82 83/* 84 * Functions to READ and WRITE to serial port 0 85 */ 86#define SERIAL_READ(ofs) (*((volatile unsigned char*) \ 87 (TITAN_SERIAL_BASE + ofs))) 88 89#define SERIAL_WRITE(ofs, val) ((*((volatile unsigned char*) \ 90 (TITAN_SERIAL_BASE + ofs))) = val) 91 92/* 93 * Functions to READ and WRITE to serial port 1 94 */ 95#define SERIAL_READ_1(ofs) (*((volatile unsigned char*) \ 96 (TITAN_SERIAL_BASE_1 + ofs))) 97 98#define SERIAL_WRITE_1(ofs, val) ((*((volatile unsigned char*) \ 99 (TITAN_SERIAL_BASE_1 + ofs))) = val) 100 101/* 102 * Second serial port initialization 103 */ 104void init_second_port(void) 105{ 106 /* Disable Interrupts */ 107 SERIAL_WRITE_1(SERIAL_LINE_CONTROL, 0x0); 108 SERIAL_WRITE_1(SERIAL_INTR_ENABLE, 0x0); 109 110 { 111 unsigned int divisor; 112 113 SERIAL_WRITE_1(SERIAL_LINE_CONTROL, 0x80); 114 divisor = TITAN_SERIAL_BASE_BAUD / YOSEMITE_BAUD_115200; 115 SERIAL_WRITE_1(SERIAL_DIVISOR_LSB, divisor & 0xff); 116 117 SERIAL_WRITE_1(SERIAL_DIVISOR_MSB, 118 (divisor & 0xff00) >> 8); 119 SERIAL_WRITE_1(SERIAL_LINE_CONTROL, 0x0); 120 } 121 122 SERIAL_WRITE_1(SERIAL_DATA_FORMAT, YOSEMITE_DATA_8BIT | 123 YOSEMITE_PARITY_NONE | YOSEMITE_STOP_1BIT); 124 125 /* Enable Interrupts */ 126 SERIAL_WRITE_1(SERIAL_INTR_ENABLE, 0xf); 127} 128 129/* Initialize the serial port for KGDB debugging */ 130void debugInit(unsigned int baud, unsigned char data, unsigned char parity, 131 unsigned char stop) 132{ 133 /* Disable Interrupts */ 134 SERIAL_WRITE(SERIAL_LINE_CONTROL, 0x0); 135 SERIAL_WRITE(SERIAL_INTR_ENABLE, 0x0); 136 137 { 138 unsigned int divisor; 139 140 SERIAL_WRITE(SERIAL_LINE_CONTROL, 0x80); 141 142 divisor = TITAN_SERIAL_BASE_BAUD / baud; 143 SERIAL_WRITE(SERIAL_DIVISOR_LSB, divisor & 0xff); 144 145 SERIAL_WRITE(SERIAL_DIVISOR_MSB, (divisor & 0xff00) >> 8); 146 SERIAL_WRITE(SERIAL_LINE_CONTROL, 0x0); 147 } 148 149 SERIAL_WRITE(SERIAL_DATA_FORMAT, data | parity | stop); 150} 151 152static int remoteDebugInitialized = 0; 153 154unsigned char getDebugChar(void) 155{ 156 if (!remoteDebugInitialized) { 157 remoteDebugInitialized = 1; 158 debugInit(YOSEMITE_BAUD_115200, 159 YOSEMITE_DATA_8BIT, 160 YOSEMITE_PARITY_NONE, YOSEMITE_STOP_1BIT); 161 } 162 163 while ((SERIAL_READ(SERIAL_LINE_STATUS) & 0x1) == 0); 164 return SERIAL_READ(SERIAL_RCV_BUFFER); 165} 166 167int putDebugChar(unsigned char byte) 168{ 169 if (!remoteDebugInitialized) { 170 remoteDebugInitialized = 1; 171 debugInit(YOSEMITE_BAUD_115200, 172 YOSEMITE_DATA_8BIT, 173 YOSEMITE_PARITY_NONE, YOSEMITE_STOP_1BIT); 174 } 175 176 while ((SERIAL_READ(SERIAL_LINE_STATUS) & 0x20) == 0); 177 SERIAL_WRITE(SERIAL_SEND_BUFFER, byte); 178 179 return 1; 180} 181