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
|
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#include "../port/flashif.h"
/*
* AMD29F0x0 with 4 interleaved to give 32 bits
*/
enum {
DQ7 = 0x80808080,
DQ6 = 0x40404040,
DQ5 = 0x20202020,
DQ3 = 0x08080808,
DQ2 = 0x04040404,
};
#define DPRINT if(0)print
#define EPRINT if(1)print
static char*
amdwait(ulong *p, ulong ticks)
{
ulong v0, v1;
ticks += m->ticks+1;
v0 = *p;
for(;;){
sched();
v1 = *p;
if((v1 & DQ6) == (v0 & DQ6))
break;
if((v1 & DQ5) == DQ5){
v0 = *p;
v1 = *p;
if((v1 & DQ6) == (v0 & DQ6))
break;
EPRINT("flash: DQ5 error: %8.8lux %8.8lux\n", v0, v1);
return "flash write error";
}
if(m->ticks >= ticks){
EPRINT("flash: timed out: %8.8lux\n", *p);
return "flash write timed out";
}
v0 = v1;
}
return nil;
}
static int
eraseall(Flash *f)
{
ulong *p;
int s;
char *e;
DPRINT("flash: erase all\n");
p = (ulong*)f->addr;
s = splhi();
*(p+0x555) = 0xAAAAAAAA;
*(p+0x2AA) = 0x55555555;
*(p+0x555) = 0x80808080;
*(p+0x555) = 0xAAAAAAAA;
*(p+0x2AA) = 0x55555555;
*(p+0x555) = 0x10101010; /* chip erase */
splx(s);
e = amdwait(p, MS2TK(64*1000));
*p = 0xF0F0F0F0; /* reset */
if(e != nil)
error(e);
return 0;
}
static int
erasezone(Flash *f, Flashregion *r, ulong addr)
{
ulong *p;
int s;
char *e;
DPRINT("flash: erase %8.8lux\n", addr);
if(addr & (r->erasesize-1))
return -1; /* bad zone */
p = (ulong*)f->addr;
s = splhi();
*(p+0x555) = 0xAAAAAAAA;
*(p+0x2AA) = 0x55555555;
*(p+0x555) = 0x80808080;
*(p+0x555) = 0xAAAAAAAA;
*(p+0x2AA) = 0x55555555;
p += addr>>2;
*p = 0x30303030; /* sector erase */
splx(s);
e = amdwait(p, MS2TK(8*1000));
*p = 0xF0F0F0F0; /* reset */
if(e != nil)
error(e);
return 0;
}
static int
write4(Flash *f, ulong offset, void *buf, long n)
{
ulong *p, *a, *v, w;
int s;
char *e;
p = (ulong*)f->addr;
if(((ulong)p|offset|n)&3)
return -1;
n >>= 2;
a = p + (offset>>2);
v = buf;
for(; --n >= 0; v++, a++){
w = *a;
DPRINT("flash: write %lux %lux -> %lux\n", (ulong)a, w, *v);
if(w == *v)
continue; /* already set */
if(~w & *v)
error("flash not erased");
s = splhi();
*(p+0x555) = 0xAAAAAAAA;
*(p+0x2AA) = 0x55555555;
*(p+0x555) = 0xA0A0A0A0; /* program */
*a = *v;
splx(s);
microdelay(8);
if(*a != *v){
microdelay(8);
while(*a != *v){
e = amdwait(a, 1);
if(e != nil)
error(e);
}
}
}
return 0;
}
static int
reset(Flash *f)
{
f->id = 0x01; /* can't use autoselect: might be running in flash */
f->devid = 0;
f->write = write4;
f->eraseall = eraseall;
f->erasezone = erasezone;
f->suspend = nil;
f->resume = nil;
f->width = 4;
f->interleave = 0; /* TO DO */
f->nr = 1;
f->regions[0] = (Flashregion){f->size/(4*64*1024), 0, f->size, 4*64*1024, 0};
*(ulong*)f->addr = 0xF0F0F0F0; /* reset (just in case) */
return 0;
}
void
flashamd29f0x0link(void)
{
addflashcard("AMD29F0x0", reset);
}
|
