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sdide: make ataidentify wait longer if theres no floating bus

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This commit is contained in:
cinap_lenrek 2012-04-18 16:49:27 +02:00
parent 1d96a8256e
commit e294bcae53
1 changed files with 16 additions and 3 deletions
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19
sys/src/9/pc/sdide.c
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@ -549,7 +549,7 @@ atadmamode(SDunit *unit, Drive* drive)
static int
ataidentify(Ctlr*, int cmdport, int ctlport, int dev, int pkt, void* info)
{
int as, command, drdy;
int as, command, drdy, rlo, rhi;
if(pkt){
command = Cidpkt;
@ -561,8 +561,21 @@ ataidentify(Ctlr*, int cmdport, int ctlport, int dev, int pkt, void* info)
}
dev &= ~Lba;
as = ataready(cmdport, ctlport, dev, Bsy|Drq, drdy, 103*1000);
if(as < 0)
return as;
if(as < 0){
/* try to detect floating bus */
outb(cmdport+Cyllo, 0xAA);
outb(cmdport+Cylhi, 0x55);
outb(cmdport+Sector, 0xFF);
rlo = inb(cmdport+Cyllo);
rhi = inb(cmdport+Cylhi);
if(rlo != 0xAA && (rlo == 0xFF || rhi != 0x55))
return as;
/* theres a device, try waiting some more */
as = ataready(cmdport, ctlport, dev, Bsy|Drq, drdy, 6*1000*1000);
if(as < 0)
return as;
}
outb(cmdport+Command, command);
microdelay(1);