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1da177e4 LT |
1 | #include <linux/config.h> |
2 | ||
3 | #ifdef CONFIG_KGDB | |
4 | ||
5 | #include <asm/serial.h> /* For the serial port location and base baud */ | |
6 | ||
7 | /* --- CONFIG --- */ | |
8 | ||
9 | typedef unsigned char uint8; | |
10 | typedef unsigned int uint32; | |
11 | ||
12 | /* --- END OF CONFIG --- */ | |
13 | ||
14 | #define UART16550_BAUD_2400 2400 | |
15 | #define UART16550_BAUD_4800 4800 | |
16 | #define UART16550_BAUD_9600 9600 | |
17 | #define UART16550_BAUD_19200 19200 | |
18 | #define UART16550_BAUD_38400 38400 | |
19 | #define UART16550_BAUD_57600 57600 | |
20 | #define UART16550_BAUD_115200 115200 | |
21 | ||
22 | #define UART16550_PARITY_NONE 0 | |
23 | #define UART16550_PARITY_ODD 0x08 | |
24 | #define UART16550_PARITY_EVEN 0x18 | |
25 | #define UART16550_PARITY_MARK 0x28 | |
26 | #define UART16550_PARITY_SPACE 0x38 | |
27 | ||
28 | #define UART16550_DATA_5BIT 0x0 | |
29 | #define UART16550_DATA_6BIT 0x1 | |
30 | #define UART16550_DATA_7BIT 0x2 | |
31 | #define UART16550_DATA_8BIT 0x3 | |
32 | ||
33 | #define UART16550_STOP_1BIT 0x0 | |
34 | #define UART16550_STOP_2BIT 0x4 | |
35 | ||
36 | /* ----------------------------------------------------- */ | |
37 | ||
38 | /* === CONFIG === */ | |
39 | ||
40 | /* [jsun] we use the second serial port for kdb */ | |
41 | #define BASE OCELOT_SERIAL1_BASE | |
42 | #define MAX_BAUD OCELOT_BASE_BAUD | |
43 | ||
44 | /* === END OF CONFIG === */ | |
45 | ||
46 | #define REG_OFFSET 4 | |
47 | ||
48 | /* register offset */ | |
49 | #define OFS_RCV_BUFFER 0 | |
50 | #define OFS_TRANS_HOLD 0 | |
51 | #define OFS_SEND_BUFFER 0 | |
52 | #define OFS_INTR_ENABLE (1*REG_OFFSET) | |
53 | #define OFS_INTR_ID (2*REG_OFFSET) | |
54 | #define OFS_DATA_FORMAT (3*REG_OFFSET) | |
55 | #define OFS_LINE_CONTROL (3*REG_OFFSET) | |
56 | #define OFS_MODEM_CONTROL (4*REG_OFFSET) | |
57 | #define OFS_RS232_OUTPUT (4*REG_OFFSET) | |
58 | #define OFS_LINE_STATUS (5*REG_OFFSET) | |
59 | #define OFS_MODEM_STATUS (6*REG_OFFSET) | |
60 | #define OFS_RS232_INPUT (6*REG_OFFSET) | |
61 | #define OFS_SCRATCH_PAD (7*REG_OFFSET) | |
62 | ||
63 | #define OFS_DIVISOR_LSB (0*REG_OFFSET) | |
64 | #define OFS_DIVISOR_MSB (1*REG_OFFSET) | |
65 | ||
66 | ||
67 | /* memory-mapped read/write of the port */ | |
68 | #define UART16550_READ(y) (*((volatile uint8*)(BASE + y))) | |
69 | #define UART16550_WRITE(y, z) ((*((volatile uint8*)(BASE + y))) = z) | |
70 | ||
71 | void debugInit(uint32 baud, uint8 data, uint8 parity, uint8 stop) | |
72 | { | |
73 | /* disable interrupts */ | |
74 | UART16550_WRITE(OFS_INTR_ENABLE, 0); | |
75 | ||
76 | /* set up buad rate */ | |
77 | { | |
78 | uint32 divisor; | |
79 | ||
80 | /* set DIAB bit */ | |
81 | UART16550_WRITE(OFS_LINE_CONTROL, 0x80); | |
82 | ||
83 | /* set divisor */ | |
84 | divisor = MAX_BAUD / baud; | |
85 | UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff); | |
86 | UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00) >> 8); | |
87 | ||
88 | /* clear DIAB bit */ | |
89 | UART16550_WRITE(OFS_LINE_CONTROL, 0x0); | |
90 | } | |
91 | ||
92 | /* set data format */ | |
93 | UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop); | |
94 | } | |
95 | ||
96 | static int remoteDebugInitialized = 0; | |
97 | ||
98 | uint8 getDebugChar(void) | |
99 | { | |
100 | if (!remoteDebugInitialized) { | |
101 | remoteDebugInitialized = 1; | |
102 | debugInit(UART16550_BAUD_38400, | |
103 | UART16550_DATA_8BIT, | |
104 | UART16550_PARITY_NONE, UART16550_STOP_1BIT); | |
105 | } | |
106 | ||
107 | while ((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0); | |
108 | return UART16550_READ(OFS_RCV_BUFFER); | |
109 | } | |
110 | ||
111 | ||
112 | int putDebugChar(uint8 byte) | |
113 | { | |
114 | if (!remoteDebugInitialized) { | |
115 | remoteDebugInitialized = 1; | |
116 | debugInit(UART16550_BAUD_38400, | |
117 | UART16550_DATA_8BIT, | |
118 | UART16550_PARITY_NONE, UART16550_STOP_1BIT); | |
119 | } | |
120 | ||
121 | while ((UART16550_READ(OFS_LINE_STATUS) & 0x20) == 0); | |
122 | UART16550_WRITE(OFS_SEND_BUFFER, byte); | |
123 | return 1; | |
124 | } | |
125 | ||
126 | #endif |