[PATCH] IDE: claim extra DMA ports regardless of channel

- Claim extra DMA I/O ports regardless of what IDE channels are
  present/enabled.

- Remove extra ports handling from ide_mapped_mmio_dma() since it's not
  applicable to the custom-mapping IDE drivers.
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Cc: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/ide/ide-dma.c

@@ -798,9 +798,9 @@ static int ide_release_dma_engine(ide_hwif_t *hwif)
 
 static int ide_release_iomio_dma(ide_hwif_t *hwif)
 {
-	if ((hwif->dma_extra) && (hwif->channel == 0))
-		release_region((hwif->dma_base + 16), hwif->dma_extra);
 	release_region(hwif->dma_base, 8);
+	if (hwif->extra_ports)
+		release_region(hwif->extra_base, hwif->extra_ports);
 	if (hwif->dma_base2)
 		release_region(hwif->dma_base, 8);
 	return 1;
@@ -841,8 +841,6 @@ static int ide_mapped_mmio_dma(ide_hwif_t *hwif, unsigned long base, unsigned in
 	printk(KERN_INFO "    %s: MMIO-DMA ", hwif->name);
 
  	hwif->dma_base = base;
-	if (hwif->cds->extra && hwif->channel == 0)
-		hwif->dma_extra = hwif->cds->extra;
 
 	if(hwif->mate)
 		hwif->dma_master = (hwif->channel) ? hwif->mate->dma_base : base;
@@ -855,14 +853,26 @@ static int ide_iomio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int port
 {
 	printk(KERN_INFO "    %s: BM-DMA at 0x%04lx-0x%04lx",
 	       hwif->name, base, base + ports - 1);
+
 	if (!request_region(base, ports, hwif->name)) {
 		printk(" -- Error, ports in use.\n");
 		return 1;
 	}
+
 	hwif->dma_base = base;
-	if ((hwif->cds->extra) && (hwif->channel == 0)) {
-		request_region(base+16, hwif->cds->extra, hwif->cds->name);
-		hwif->dma_extra = hwif->cds->extra;
+
+	if (hwif->cds->extra) {
+		hwif->extra_base = base + (hwif->channel ? 8 : 16);
+
+		if (!hwif->mate || !hwif->mate->extra_ports) {
+			if (!request_region(hwif->extra_base,
+					    hwif->cds->extra, hwif->cds->name)) {
+				printk(" -- Error, extra ports in use.\n");
+				release_region(base, ports);
+				return 1;
+			}
+			hwif->extra_ports = hwif->cds->extra;
+		}
 	}
 
 	if(hwif->mate)
@@ -874,6 +884,8 @@ static int ide_iomio_dma(ide_hwif_t *hwif, unsigned long base, unsigned int port
 		{
 			printk(" -- Error, secondary ports in use.\n");
 			release_region(base, ports);
+			if (hwif->extra_ports)
+				release_region(hwif->extra_base, hwif->extra_ports);
 			return 1;
 		}
 	}

drivers/ide/ide.c

@@ -450,7 +450,7 @@ void ide_hwif_release_regions(ide_hwif_t *hwif)
  *	@hwif: hwif to update
  *	@tmp_hwif: template
  *
- *	Restore hwif to a previous state by copying most settngs
+ *	Restore hwif to a previous state by copying most settings
  *	from the template.
  */
 
@@ -539,9 +539,10 @@ static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 	hwif->dma_vendor3		= tmp_hwif->dma_vendor3;
 	hwif->dma_prdtable		= tmp_hwif->dma_prdtable;
 
-	hwif->dma_extra			= tmp_hwif->dma_extra;
 	hwif->config_data		= tmp_hwif->config_data;
 	hwif->select_data		= tmp_hwif->select_data;
+	hwif->extra_base		= tmp_hwif->extra_base;
+	hwif->extra_ports		= tmp_hwif->extra_ports;
 	hwif->autodma			= tmp_hwif->autodma;
 	hwif->udma_four			= tmp_hwif->udma_four;
 	hwif->no_dsc			= tmp_hwif->no_dsc;
@@ -550,7 +551,7 @@ static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
 }
 
 /**
- *	ide_unregister		-	free an ide interface
+ *	ide_unregister		-	free an IDE interface
  *	@index: index of interface (will change soon to a pointer)
  *
  *	Perform the final unregister of an IDE interface. At the moment
@@ -563,8 +564,8 @@ static void ide_hwif_restore(ide_hwif_t *hwif, ide_hwif_t *tmp_hwif)
  *	deadlocking the IDE layer. The shutdown callback is called
  *	before we take the lock and free resources. It is up to the
  *	caller to be sure there is no pending I/O here, and that
- *	the interfce will not be reopened (present/vanishing locking
- *	isnt yet done btw). After we commit to the final kill we
+ *	the interface will not be reopened (present/vanishing locking
+ *	isn't yet done BTW). After we commit to the final kill we
  *	call the cleanup callback with the ide locks held.
  *
  *	Unregister restores the hwif structures to the default state.
@@ -674,6 +675,9 @@ void ide_unregister(unsigned int index)
 		hwif->dma_status = 0;
 		hwif->dma_vendor3 = 0;
 		hwif->dma_prdtable = 0;
+
+		hwif->extra_base  = 0;
+		hwif->extra_ports = 0;
 	}
 
 	/* copy original settings */

include/linux/ide.h

@@ -775,10 +775,12 @@ typedef struct hwif_s {
 	unsigned long	dma_prdtable;	/* actual prd table address */
 	unsigned long	dma_base2;	/* extended base addr for dma ports */
 
-	unsigned	dma_extra;	/* extra addr for dma ports */
 	unsigned long	config_data;	/* for use by chipset-specific code */
 	unsigned long	select_data;	/* for use by chipset-specific code */
 
+	unsigned long	extra_base;	/* extra addr for dma ports */
+	unsigned	extra_ports;	/* number of extra dma ports */
+
 	unsigned	noprobe    : 1;	/* don't probe for this interface */
 	unsigned	present    : 1;	/* this interface exists */
 	unsigned	hold       : 1; /* this interface is always present */