aboutsummaryrefslogtreecommitdiff
path: root/arch/ppc/xmon/start_8xx.c
blob: 30974068c22399dfdc3450d8b04f3484377104ac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
/*
 * Copyright (C) 1996 Paul Mackerras.
 * Copyright (C) 2000 Dan Malek.
 * Quick hack of Paul's code to make XMON work on 8xx processors.  Lots
 * of assumptions, like the SMC1 is used, it has been initialized by the
 * loader at some point, and we can just stuff and suck bytes.
 * We rely upon the 8xx uart driver to support us, as the interface
 * changes between boot up and operational phases of the kernel.
 */
#include <linux/string.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/page.h>
#include <linux/kernel.h>
#include <asm/8xx_immap.h>
#include <asm/mpc8xx.h>
#include <asm/cpm1.h>

extern void xmon_printf(const char *fmt, ...);
extern int xmon_8xx_write(char *str, int nb);
extern int xmon_8xx_read_poll(void);
extern int xmon_8xx_read_char(void);
void prom_drawhex(uint);
void prom_drawstring(const char *str);

static int use_screen = 1; /* default */

#define TB_SPEED	25000000

static inline unsigned int readtb(void)
{
	unsigned int ret;

	asm volatile("mftb %0" : "=r" (ret) :);
	return ret;
}

void buf_access(void)
{
}

void
xmon_map_scc(void)
{

	cpmp = (cpm8xx_t *)&(((immap_t *)IMAP_ADDR)->im_cpm);
	use_screen = 0;
	
	prom_drawstring("xmon uses serial port\n");
}

static int scc_initialized = 0;

void xmon_init_scc(void);

int
xmon_write(void *handle, void *ptr, int nb)
{
	char *p = ptr;
	int i, c, ct;

	if (!scc_initialized)
		xmon_init_scc();

	return(xmon_8xx_write(ptr, nb));
}

int xmon_wants_key;

int
xmon_read(void *handle, void *ptr, int nb)
{
	char *p = ptr;
	int i;

	if (!scc_initialized)
		xmon_init_scc();

	for (i = 0; i < nb; ++i) {
		*p++ = xmon_8xx_read_char();
	}
	return i;
}

int
xmon_read_poll(void)
{
	return(xmon_8xx_read_poll());
}

void
xmon_init_scc()
{
	scc_initialized = 1;
}

#if 0
extern int (*prom_entry)(void *);

int
xmon_exit(void)
{
    struct prom_args {
	char *service;
    } args;

    for (;;) {
	args.service = "exit";
	(*prom_entry)(&args);
    }
}
#endif

void *xmon_stdin;
void *xmon_stdout;
void *xmon_stderr;

void
xmon_init(void)
{
}

int
xmon_putc(int c, void *f)
{
    char ch = c;

    if (c == '\n')
	xmon_putc('\r', f);
    return xmon_write(f, &ch, 1) == 1? c: -1;
}

int
xmon_putchar(int c)
{
    return xmon_putc(c, xmon_stdout);
}

int
xmon_fputs(char *str, void *f)
{
    int n = strlen(str);

    return xmon_write(f, str, n) == n? 0: -1;
}

int
xmon_readchar(void)
{
    char ch;

    for (;;) {
	switch (xmon_read(xmon_stdin, &ch, 1)) {
	case 1:
	    return ch;
	case -1:
	    xmon_printf("read(stdin) returned -1\r\n", 0, 0);
	    return -1;
	}
    }
}

static char line[256];
static char *lineptr;
static int lineleft;

#if 0
int xmon_expect(const char *str, unsigned int timeout)
{
	int c;
	unsigned int t0;

	timeout *= TB_SPEED;
	t0 = readtb();
	do {
		lineptr = line;
		for (;;) {
			c = xmon_read_poll();
			if (c == -1) {
				if (readtb() - t0 > timeout)
					return 0;
				continue;
			}
			if (c == '\n')
				break;
			if (c != '\r' && lineptr < &line[sizeof(line) - 1])
				*lineptr++ = c;
		}
		*lineptr = 0;
	} while (strstr(line, str) == NULL);
	return 1;
}
#endif

int
xmon_getchar(void)
{
    int c;

    if (lineleft == 0) {
	lineptr = line;
	for (;;) {
	    c = xmon_readchar();
	    if (c == -1 || c == 4)
		break;
	    if (c == '\r' || c == '\n') {
		*lineptr++ = '\n';
		xmon_putchar('\n');
		break;
	    }
	    switch (c) {
	    case 0177:
	    case '\b':
		if (lineptr > line) {
		    xmon_putchar('\b');
		    xmon_putchar(' ');
		    xmon_putchar('\b');
		    --lineptr;
		}
		break;
	    case 'U' & 0x1F:
		while (lineptr > line) {
		    xmon_putchar('\b');
		    xmon_putchar(' ');
		    xmon_putchar('\b');
		    --lineptr;
		}
		break;
	    default:
		if (lineptr >= &line[sizeof(line) - 1])
		    xmon_putchar('\a');
		else {
		    xmon_putchar(c);
		    *lineptr++ = c;
		}
	    }
	}
	lineleft = lineptr - line;
	lineptr = line;
    }
    if (lineleft == 0)
	return -1;
    --lineleft;
    return *lineptr++;
}

char *
xmon_fgets(char *str, int nb, void *f)
{
    char *p;
    int c;

    for (p = str; p < str + nb - 1; ) {
	c = xmon_getchar();
	if (c == -1) {
	    if (p == str)
		return 0;
	    break;
	}
	*p++ = c;
	if (c == '\n')
	    break;
    }
    *p = 0;
    return str;
}

void
prom_drawhex(uint val)
{
	unsigned char buf[10];

	int i;
	for (i = 7;  i >= 0;  i--)
	{
		buf[i] = "0123456789abcdef"[val & 0x0f];
		val >>= 4;
	}
	buf[8] = '\0';
	xmon_fputs(buf, xmon_stdout);
}

void
prom_drawstring(const char *str)
{
	xmon_fputs(str, xmon_stdout);
}