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enum {
DQ7 = I(0x80),
DQ6 = I(0x40),
DQ5 = I(0x20),
DQ4 = I(0x10),
DQ3 = I(0x08),
DQ2 = I(0x04),
DQ1 = I(0x02),
DQ0 = I(0x01),
};
/*
* intel algorithm
*/
enum {
ReadID = I(0x90),
ClearStatus = I(0x50),
ReadStatus = I(0x70),
Program = I(0x40),
BlockErase = I(0x20),
Confirm = I(0xD0),
};
#define DPRINT if(0)print
#define EPRINT if(1)print
static char*
intelwait(Flash *f, void *p, ulong ticks)
{
ulong csr, mask;
ticks += m->ticks+1;
mask = f->cmask;
for(;;){
if(f->width == 2)
csr = *(ushort*)p;
else
csr = *(ulong*)p;
if((csr & mask) == (DQ7 & mask))
break;
sched();
if(m->ticks >= ticks)
return "flash write timed out";
}
if(csr & (DQ5|DQ4|DQ3|DQ1)){
EPRINT("flash: error: %8.8lux %8.8lux\n", p, csr);
if(csr & DQ1)
return "flash block locked";
if(csr & DQ3)
return "low flash programming voltage";
return Eio;
}
return nil;
}
static int
intelerase(Flash *f, Flashregion *r, ulong addr)
{
int s;
char *e;
DPRINT("flash: erase zone %8.8lux\n", addr);
if(addr & (r->erasesize-1))
return -1; /* bad zone */
if(f->width == 2){
ushort *p = (ushort*)((ulong)f->addr + addr);
s = splhi();
*p = BlockErase & f->cmask;
*p = Confirm & f->cmask;
splx(s);
e = intelwait(f, p, MS2TK(8*1000));
*p = ClearStatus & f->cmask;
*p = ReadArray & f->cmask;
}else{
ulong *p = (ulong*)((ulong)f->addr + addr);
s = splhi();
*p = BlockErase & f->cmask;
*p = Confirm & f->cmask;
splx(s);
e = intelwait(f, p, MS2TK(8*1000));
*p = ClearStatus & f->cmask;
*p = ReadArray & f->cmask;
}
if(e != nil)
error(e);
return 0;
}
static int
intelwrite2(Flash *f, ulong offset, void *buf, long n)
{
ushort *a, *v;
ulong w;
int s;
char *e;
if(((ulong)f->addr|offset|n)&(f->width-1))
return -1;
a = (ushort*)((ulong)f->addr + offset);
n /= f->width;
v = buf;
if(waserror()){
*a = ClearStatus & f->cmask;
*a = ReadArray & f->cmask;
nexterror();
}
for(; --n >= 0; v++, a++){
w = *a;
DPRINT("flash: write %p %#ulx -> %#lux\n", a, w, (ulong)*v);
if(w == *v)
continue; /* already set */
if(~w & *v)
error("flash not erased");
s = splhi();
*a = Program & f->cmask; /* program */
*a = *v;
splx(s);
microdelay(8);
e = intelwait(f, a, 5);
*a = ClearStatus & f->cmask;
*a = ReadArray & f->cmask;
if(e != nil)
error(e);
w = *a;
if(w != *v){
EPRINT("flash: write %p %#8.8lux -> %#8.8lux failed\n", a, w, (ulong)*v);
error(Eio);
}
}
poperror();
return 0;
}
static int
intelwrite4(Flash *f, ulong offset, void *buf, long n)
{
ulong *a, *v;
ulong w;
int s;
char *e;
if(((ulong)f->addr|offset|n)&(f->width-1))
return -1;
a = (ulong*)((ulong)f->addr + offset);
n /= f->width;
v = buf;
if(waserror()){
*a = ClearStatus & f->cmask;
*a = ReadArray & f->cmask;
nexterror();
}
for(; --n >= 0; v++, a++){
w = *a;
DPRINT("flash: write %p %#ulx -> %#lux\n", a, w, (ulong)*v);
if(w == *v)
continue; /* already set */
if(~w & *v)
error("flash not erased");
s = splhi();
*a = Program; /* program */
*a = *v;
splx(s);
microdelay(8);
e = intelwait(f, a, 5);
*a = ClearStatus & f->cmask;
*a = ReadArray & f->cmask;
if(e != nil)
error(e);
w = *a;
if(w != *v){
EPRINT("flash: write %p %#8.8lux -> %#8.8lux failed\n", a, w, *v);
error(Eio);
}
}
poperror();
return 0;
}
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