summaryrefslogtreecommitdiff
path: root/arch/ppc/xmon/adb.c
blob: e91384dcccacf9c675c903c0e41fbb416ee0fad4 (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
/*
 * Copyright (C) 1996 Paul Mackerras.
 */
#include "nonstdio.h"
#include "privinst.h"

#define scanhex	xmon_scanhex
#define skipbl	xmon_skipbl

#define ADB_B		(*(volatile unsigned char *)0xf3016000)
#define ADB_SR		(*(volatile unsigned char *)0xf3017400)
#define ADB_ACR		(*(volatile unsigned char *)0xf3017600)
#define ADB_IFR		(*(volatile unsigned char *)0xf3017a00)

static inline void eieio(void) { asm volatile ("eieio" : :); }

#define N_ADB_LOG	1000
struct adb_log {
    unsigned char b;
    unsigned char ifr;
    unsigned char acr;
    unsigned int time;
} adb_log[N_ADB_LOG];
int n_adb_log;

void
init_adb_log(void)
{
    adb_log[0].b = ADB_B;
    adb_log[0].ifr = ADB_IFR;
    adb_log[0].acr = ADB_ACR;
    adb_log[0].time = get_dec();
    n_adb_log = 0;
}

void
dump_adb_log(void)
{
    unsigned t, t0;
    struct adb_log *ap;
    int i;

    ap = adb_log;
    t0 = ap->time;
    for (i = 0; i <= n_adb_log; ++i, ++ap) {
	t = t0 - ap->time;
	printf("b=%x ifr=%x acr=%x at %d.%.7d\n", ap->b, ap->ifr, ap->acr,
	       t / 1000000000, (t % 1000000000) / 100);
    }
}

void
adb_chklog(void)
{
    struct adb_log *ap = &adb_log[n_adb_log + 1];

    ap->b = ADB_B;
    ap->ifr = ADB_IFR;
    ap->acr = ADB_ACR;
    if (ap->b != ap[-1].b || (ap->ifr & 4) != (ap[-1].ifr & 4)
	|| ap->acr != ap[-1].acr) {
	ap->time = get_dec();
	++n_adb_log;
    }
}

int
adb_bitwait(int bmask, int bval, int fmask, int fval)
{
    int i;
    struct adb_log *ap;

    for (i = 10000; i > 0; --i) {
	adb_chklog();
	ap = &adb_log[n_adb_log];
	if ((ap->b & bmask) == bval && (ap->ifr & fmask) == fval)
	    return 0;
    }
    return -1;
}

int
adb_wait(void)
{
    if (adb_bitwait(0, 0, 4, 4) < 0) {
	printf("adb: ready wait timeout\n");
	return -1;
    }
    return 0;
}

void
adb_readin(void)
{
    int i, j;
    unsigned char d[64];

    if (ADB_B & 8) {
	printf("ADB_B: %x\n", ADB_B);
	return;
    }
    i = 0;
    adb_wait();
    j = ADB_SR;
    eieio();
    ADB_B &= ~0x20;
    eieio();
    for (;;) {
	if (adb_wait() < 0)
	    break;
	d[i++] = ADB_SR;
	eieio();
	if (ADB_B & 8)
	    break;
	ADB_B ^= 0x10;
	eieio();
    }
    ADB_B |= 0x30;
    if (adb_wait() == 0)
	j = ADB_SR;
    for (j = 0; j < i; ++j)
	printf("%.2x ", d[j]);
    printf("\n");
}

int
adb_write(unsigned char *d, int i)
{
    int j;
    unsigned x;

    if ((ADB_B & 8) == 0) {
	printf("r: ");
	adb_readin();
    }
    for (;;) {
	ADB_ACR = 0x1c;
	eieio();
	ADB_SR = d[0];
	eieio();
	ADB_B &= ~0x20;
	eieio();
	if (ADB_B & 8)
	    break;
	ADB_ACR = 0xc;
	eieio();
	ADB_B |= 0x20;
	eieio();
	adb_readin();
    }
    adb_wait();
    for (j = 1; j < i; ++j) {
	ADB_SR = d[j];
	eieio();
	ADB_B ^= 0x10;
	eieio();
	if (adb_wait() < 0)
	    break;
    }
    ADB_ACR = 0xc;
    eieio();
    x = ADB_SR;
    eieio();
    ADB_B |= 0x30;
    return j;
}

void
adbcmds(void)
{
    char cmd;
    unsigned rtcu, rtcl, dec, pdec, x;
    int i, j;
    unsigned char d[64];

    cmd = skipbl();
    switch (cmd) {
    case 't':
	for (;;) {
	    rtcl = get_rtcl();
	    rtcu = get_rtcu();
	    dec = get_dec();
	    printf("rtc u=%u l=%u dec=%x (%d = %d.%.7d)\n",
		   rtcu, rtcl, dec, pdec - dec, (pdec - dec) / 1000000000,
		   ((pdec - dec) % 1000000000) / 100);
	    pdec = dec;
	    if (cmd == 'x')
		break;
	    while (xmon_read(stdin, &cmd, 1) != 1)
		;
	}
	break;
    case 'r':
	init_adb_log();
	while (adb_bitwait(8, 0, 0, 0) == 0)
	    adb_readin();
	break;
    case 'w':
	i = 0;
	while (scanhex(&x))
	    d[i++] = x;
	init_adb_log();
	j = adb_write(d, i);
	printf("sent %d bytes\n", j);
	while (adb_bitwait(8, 0, 0, 0) == 0)
	    adb_readin();
	break;
    case 'l':
	dump_adb_log();
	break;
    }
}