Remove obsolete #include <linux/config.h>
[linux-3.10.git] / arch / mips / momentum / ocelot_g / dbg_io.c
1
2 #ifdef CONFIG_KGDB
3
4 #include <asm/serial.h> /* For the serial port location and base baud */
5
6 /* --- CONFIG --- */
7
8 typedef unsigned char uint8;
9 typedef unsigned int uint32;
10
11 /* --- END OF CONFIG --- */
12
13 #define         UART16550_BAUD_2400             2400
14 #define         UART16550_BAUD_4800             4800
15 #define         UART16550_BAUD_9600             9600
16 #define         UART16550_BAUD_19200            19200
17 #define         UART16550_BAUD_38400            38400
18 #define         UART16550_BAUD_57600            57600
19 #define         UART16550_BAUD_115200           115200
20
21 #define         UART16550_PARITY_NONE           0
22 #define         UART16550_PARITY_ODD            0x08
23 #define         UART16550_PARITY_EVEN           0x18
24 #define         UART16550_PARITY_MARK           0x28
25 #define         UART16550_PARITY_SPACE          0x38
26
27 #define         UART16550_DATA_5BIT             0x0
28 #define         UART16550_DATA_6BIT             0x1
29 #define         UART16550_DATA_7BIT             0x2
30 #define         UART16550_DATA_8BIT             0x3
31
32 #define         UART16550_STOP_1BIT             0x0
33 #define         UART16550_STOP_2BIT             0x4
34
35 /* ----------------------------------------------------- */
36
37 /* === CONFIG === */
38
39 /* [jsun] we use the second serial port for kdb */
40 #define         BASE                    OCELOT_SERIAL1_BASE
41 #define         MAX_BAUD                OCELOT_BASE_BAUD
42
43 /* === END OF CONFIG === */
44
45 #define         REG_OFFSET              4
46
47 /* register offset */
48 #define         OFS_RCV_BUFFER          0
49 #define         OFS_TRANS_HOLD          0
50 #define         OFS_SEND_BUFFER         0
51 #define         OFS_INTR_ENABLE         (1*REG_OFFSET)
52 #define         OFS_INTR_ID             (2*REG_OFFSET)
53 #define         OFS_DATA_FORMAT         (3*REG_OFFSET)
54 #define         OFS_LINE_CONTROL        (3*REG_OFFSET)
55 #define         OFS_MODEM_CONTROL       (4*REG_OFFSET)
56 #define         OFS_RS232_OUTPUT        (4*REG_OFFSET)
57 #define         OFS_LINE_STATUS         (5*REG_OFFSET)
58 #define         OFS_MODEM_STATUS        (6*REG_OFFSET)
59 #define         OFS_RS232_INPUT         (6*REG_OFFSET)
60 #define         OFS_SCRATCH_PAD         (7*REG_OFFSET)
61
62 #define         OFS_DIVISOR_LSB         (0*REG_OFFSET)
63 #define         OFS_DIVISOR_MSB         (1*REG_OFFSET)
64
65
66 /* memory-mapped read/write of the port */
67 #define         UART16550_READ(y)    (*((volatile uint8*)(BASE + y)))
68 #define         UART16550_WRITE(y, z)  ((*((volatile uint8*)(BASE + y))) = z)
69
70 void debugInit(uint32 baud, uint8 data, uint8 parity, uint8 stop)
71 {
72         /* disable interrupts */
73         UART16550_WRITE(OFS_INTR_ENABLE, 0);
74
75         /* set up baud rate */
76         {
77                 uint32 divisor;
78
79                 /* set DIAB bit */
80                 UART16550_WRITE(OFS_LINE_CONTROL, 0x80);
81
82                 /* set divisor */
83                 divisor = MAX_BAUD / baud;
84                 UART16550_WRITE(OFS_DIVISOR_LSB, divisor & 0xff);
85                 UART16550_WRITE(OFS_DIVISOR_MSB, (divisor & 0xff00) >> 8);
86
87                 /* clear DIAB bit */
88                 UART16550_WRITE(OFS_LINE_CONTROL, 0x0);
89         }
90
91         /* set data format */
92         UART16550_WRITE(OFS_DATA_FORMAT, data | parity | stop);
93 }
94
95 static int remoteDebugInitialized = 0;
96
97 uint8 getDebugChar(void)
98 {
99         if (!remoteDebugInitialized) {
100                 remoteDebugInitialized = 1;
101                 debugInit(UART16550_BAUD_38400,
102                           UART16550_DATA_8BIT,
103                           UART16550_PARITY_NONE, UART16550_STOP_1BIT);
104         }
105
106         while ((UART16550_READ(OFS_LINE_STATUS) & 0x1) == 0);
107         return UART16550_READ(OFS_RCV_BUFFER);
108 }
109
110
111 int putDebugChar(uint8 byte)
112 {
113         if (!remoteDebugInitialized) {
114                 remoteDebugInitialized = 1;
115                 debugInit(UART16550_BAUD_38400,
116                           UART16550_DATA_8BIT,
117                           UART16550_PARITY_NONE, UART16550_STOP_1BIT);
118         }
119
120         while ((UART16550_READ(OFS_LINE_STATUS) & 0x20) == 0);
121         UART16550_WRITE(OFS_SEND_BUFFER, byte);
122         return 1;
123 }
124
125 #endif