IOReturn
AppleKiwiATA::selectIOTimerValue( IOATADevConfig* configRequest, UInt32 unitNumber)
{
// This particular chip snoops the SetFeatures command, so we just snag what the
// driver tells us as info, but don't set the chip in anyway.
busTimings[unitNumber].ataPIOSpeedMode = configRequest->getPIOMode();
busTimings[unitNumber].ataPIOCycleTime = configRequest->getPIOCycleTime();
busTimings[unitNumber].ataMultiDMASpeed = configRequest->getDMAMode();
busTimings[unitNumber].ataMultiCycleTime = configRequest->getDMACycleTime();
busTimings[unitNumber].ataUltraDMASpeedMode = configRequest->getUltraMode();
IOLog("AppleKiwiATA: PIO Mode %d UDMA mode %d \n",
bitSigToNumeric(busTimings[unitNumber].ataPIOSpeedMode),
bitSigToNumeric(busTimings[unitNumber].ataUltraDMASpeedMode) );
// stuff the values back into the request structure and return result
return getConfig( configRequest, unitNumber);
}
void
AppleKiwiATA::selectIOTiming( ataUnitID unit )
{
// this chip snoops the SetFeatures command and we don't need to do anything
// unless it is running with the PLL at 133mhz in the case of the 271. In
// that event, we have to override the snoop mode because the chip's internals
// don't set the correct mode unless the pll is running at 100 mhz.
if(mode6Capable)
{
UInt32 bTiming = kPartBTiming33LE;
switch(bitSigToNumeric(busTimings[unit].ataUltraDMASpeedMode) )
{
case 2:
bTiming = kPartBTiming33LE;
break;
case 4:
bTiming = kPartBTiming66LE;
break;
case 5:
bTiming = kPartBTiming100LE;
break;
case 6:
bTiming = kPartBTiming133LE;
break;
default:
IOLog("AppleKiwiATA: error setting timing registers\n");
break;
}
//set the registers
if( unit == 0)
{
*timingAReg0 = kPartATimingLE;
*timingBReg0 = bTiming;
} else {
*timingAReg1 = kPartATimingLE;
*timingBReg1 = bTiming;
}
OSSynchronizeIO();
}
return;
}
IOReturn
OHareATA::selectIOTimerValue( IOATADevConfig* configRequest, UInt32 unitNumber)
{
// table of default cycle times to use when a device requests a mode
// by number, but doesn't include a cycle time.
static const UInt16 MinPIOCycle[kATAMaxPIOMode + 1] =
{
600, // Mode 0
383, // Mode 1
240, // Mode 2
180, // Mode 3
120 // Mode 4
};
static const UInt16 MinMultiDMACycle[kATAMaxMultiDMAMode + 1] =
{
480, // Mode 0
150, // Mode 1
120 // Mode 2
};
// table of PIO cycle times and the corresponding binary numbers
// that the config register needs to make that timing.
static const UInt32 PIOCycleValue[kOHarePIOCycleEntries] =
{
0x00000400, // Hardware maximum (2070 ns = 'E' + 1110 rec + 960 acc)
0x00000526, // Minimum PIO mode 0 (600 ns = 'E' + 420 rec + 180 acc)
0x00000085, // Minimum PIO mode 1 (390 ns = 240 rec + 150 acc)
0x00000046, // Derated PIO Mode 2/3/4 (360 ns = 180 rec + 180 acc)
0x00000045, // Derated PIO Mode 2/3/4 (330 ns = 180 rec + 150 acc)
0x00000025, // Derated PIO Mode 2/3/4 (300 ns = 150 rec + 150 acc)
0x00000025, // Derated PIO mode 2/3/4 (300 ns = 150 rec + 150 acc)
0x00000025, // Minimum PIO mode 2 (300 ns = 150 rec + 150 acc)
0x00000025, // Derated PIO Mode 3/4 (300 ns = 150 rec + 150 acc)
0x00000025, // Minimum PIO mode 3 (300 ns = 150 rec + 150 acc)
0x00000025 // Minimum PIO mode 4 (300 ns = 150 rec + 150 acc)
};
static const UInt16 PIOCycleTime[ kOHarePIOCycleEntries ]=
{
2070, // Hardware maximum (0)
600, // Minimum PIO mode 0 (1)
383, // Minimum PIO mode 1 (2)
360, // Derated PIO Mode 2/3/4 (3)
330, // Derated PIO Mode 2/3/4 (4)
300, // Derated PIO Mode 2/3/4 (5)
270, // Derated PIO mode 2/3/4 (6)
240, // Minimum PIO mode 2 (7)
239, // Derated PIO Mode 3/4 (8)
180, // Minimum PIO mode 3 (9)
120, // Minimum PIO mode 4 (10)
};
// table of DMA cycle times and the corresponding binary value to reach that number.
static const UInt32 MultiDMACycleValue[kOHareMultiDMACycleEntries] =
{
0x00000000, // Hardware maximum (1950= 990rec+960acc)
0x00074000, // Minimum Multi mode 0 (480= 240rec+240acc)
0x00053000, // Derated mode 1 or 2 (360= 180rec+180acc)
0x00242000, // Derated mode 1 or 2 (270=H+135rec+135acc)
0x00032000, // Derated mode 1 or 2 (240= 120rec+120acc)
0x00231800, // Derated mode 1 or 2 (210=H+105rec+105acc)
0x00021800, // Derated mode 1 or 2 (180= 90rec+90acc)
0x00221000, // Minimum Multi mode 1 (150=H+75rec+75acc)
0x00211000 // Minimum Multi mode 2 (120=H+45rec+75acc)(rd) (150=H+75rec+75acc)(wr)
};
static const UInt16 MultiDMACycleTime[kOHareMultiDMACycleEntries] =
{
1950, // Hardware maximum (0)
480, // Minimum Multi mode 0 (1)
360, // Derated mode 1 or 2 (2)
270, // Derated mode 1 or 2 (3)
240, // Derated mode 1 or 2 (4)
210, // Derated mode 1 or 2 (5)
180, // Derated mode 1 or 2 (6)
150, // Minimum Multi mode 1 (7)
120 // Minimum Multi mode 2 (8)
};
UInt32 pioConfigBits = PIOCycleValue[0];
// the theory is simple, just examine the requested mode and cycle time, find the
// entry in the table which is closest, but NOT faster than the requested cycle time.
// convert the bit maps into numbers
UInt32 pioModeNumber = bitSigToNumeric( configRequest->getPIOMode());
// check for out of range values.
if( pioModeNumber > kATAMaxPIOMode )
{
DLOG("OHareATA pio mode out of range\n");
return kATAModeNotSupported;
}
// use a default cycle time if the device didn't report a time
// to use.
UInt32 pioCycleTime = configRequest->getPIOCycleTime();
if( pioCycleTime < MinPIOCycle[ pioModeNumber ] )
{
pioCycleTime = MinPIOCycle[ pioModeNumber ];
}
// loop until a the hardware cycle time is longer than the
// or equal to the requested cycle time
for( int i = kOHarePIOCycleEntries - 1; i >= 0; i--)
{
if( pioCycleTime <= PIOCycleTime[ i ] )
{
// found the fastest time which is not greater than
// the requested time.
pioConfigBits = PIOCycleValue[i];
break;
}
}
// now do the same for DMA modes.
UInt32 dmaConfigBits = MultiDMACycleValue[0];
UInt32 dmaModeNumber = bitSigToNumeric( configRequest->getDMAMode() );
// if the device requested no DMA mode, then just set the timer to mode 0
if( dmaModeNumber > kATAMaxMultiDMAMode )
{
dmaModeNumber = 0;
}
UInt32 dmaCycleTime = configRequest->getDMACycleTime();
if( dmaCycleTime < MinMultiDMACycle[ dmaModeNumber ] )
{
dmaCycleTime = MinMultiDMACycle[ dmaModeNumber ];
}
// loop until a the hardware cycle time is longer than the
// or equal to the requested cycle time
for( int i = kOHareMultiDMACycleEntries - 1; i >= 0; i--)
{
if( dmaCycleTime <= MultiDMACycleTime[ i ] )
{
// found the fastest time which is not greater than
// the requested time.
dmaConfigBits = MultiDMACycleValue[i];
break;
}
}
// now combine the bits forming the configuration and put them
// into the timing structure along with the mode and cycle time
busTimings[unitNumber].cycleRegValue = dmaConfigBits | pioConfigBits;
busTimings[unitNumber].ataPIOSpeedMode = configRequest->getPIOMode();
busTimings[unitNumber].ataPIOCycleTime = pioCycleTime;
busTimings[unitNumber].ataMultiDMASpeed = configRequest->getDMAMode();
busTimings[unitNumber].ataMultiCycleTime = dmaCycleTime;
DLOG("OHareATA PIO mode %x at %ld ns selected for device: %x\n", (int)pioModeNumber, pioCycleTime, (int)unitNumber);
DLOG("OHareATA DMA mode %x at %ld ns selected for device: %x\n", (int)dmaModeNumber, dmaCycleTime, (int)unitNumber);
// stuff the values back into the request structure and return result
return getConfig( configRequest, unitNumber);
}
