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1da177e4 LT |
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*) \ | |
d390008e | 96 | (TITAN_SERIAL_BASE_1 + ofs))) |
1da177e4 LT |
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 | */ | |
104 | void 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 */ | |
130 | void 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 | ||
152 | static int remoteDebugInitialized = 0; | |
153 | ||
154 | unsigned 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 | ||
167 | int 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 | } |