Apply block count maximum according to device capability. If the device supports

LBA48 we can allow a maximum block count of 65535 as we have a 16bit sector
count field available.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@30254 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/bus_managers/ata/ATAChannel.cpp

@@ -197,13 +197,10 @@ ATAChannel::GetRestrictions(uint8 targetID, bool *isATAPI, bool *noAutoSense,
 	// we always indicate ATAPI so we have to emulate fewer commands
 	*isATAPI = true;
 	*noAutoSense = false;
+	*maxBlocks = 0x100;
 
-	if (targetID < fDeviceCount && fDevices[targetID] != NULL
-		&& fDevices[targetID]->IsATAPI()) {
-		*noAutoSense = true;
-	}
-
-	*maxBlocks = 255;
+	if (targetID < fDeviceCount && fDevices[targetID] != NULL)
+		fDevices[targetID]->GetRestrictions(noAutoSense, maxBlocks);
 }
 
 

src/add-ons/kernel/bus_managers/ata/ATADevice.cpp

@@ -286,6 +286,20 @@ ATADevice::ExecuteIO(ATARequest *request)
 }
 
 
+void
+ATADevice::GetRestrictions(bool *noAutoSense, uint32 *maxBlocks)
+{
+	if (IsATAPI())
+		*noAutoSense = true;
+	else {
+		if (fUse48Bits)
+			*maxBlocks = 0xffff;
+		else
+			*maxBlocks = 0x100;
+	}
+}
+
+
 status_t
 ATADevice::Select()
 {

src/add-ons/kernel/bus_managers/ata/ATAModule.cpp

@@ -190,9 +190,9 @@ ata_channel_added(device_node *parent)
 		// maximum number of blocks per transmission:
 		// - ATAPI uses packets, i.e. normal SCSI limits apply
 		//   but I'm not sure about controller restrictions
-		// - ATA allows up to 256 blocks
+		// - ATA allows up to 256 blocks for LBA28 and 65535 for LBA48
 		// to fix specific drive bugs use ATAChannel::GetRestrictions()
-		{ B_DMA_MAX_TRANSFER_BLOCKS, B_UINT32_TYPE, { ui32: 255 } },
+		{ B_DMA_MAX_TRANSFER_BLOCKS, B_UINT32_TYPE, { ui32: 0xffff } },
 		{ ATA_CHANNEL_ID_ITEM, B_UINT32_TYPE, { ui32: channelID } },
 		{ NULL }
 	};

src/add-ons/kernel/bus_managers/ata/ATAPrivate.h

@@ -173,6 +173,9 @@ virtual								~ATADevice();
 		status_t					ReadCapacity(ATARequest *request);
 virtual	status_t					ExecuteIO(ATARequest *request);
 
+		void						GetRestrictions(bool *noAutoSense,
+										uint32 *maxBlocks);
+
 		// ATA stuff
 virtual	bool						IsATAPI() { return false; };