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android-review.linaro.org / kernel / hikey-linaro / 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 / . / arch / mips / gt64120 / momenco_ocelot / dbg_io.c
blob: 8720bccfdea250dd9eddbe580c22b8f4e75fa60e [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame^]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
9typedef unsigned char uint8;
10typedef 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
71void 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
96static int remoteDebugInitialized = 0;
97
98uint8 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
112int 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