falconide/q40ide: add ->atapi_*put_bytes and ->ata_*put_data methods (take 2)

* Add ->atapi_{in,out}put_bytes and ->ata_{in,out}put_data methods to
  falconide and q40ide host drivers (->ata_* methods are implemented on
  top of ->atapi_* methods so they also do byte-swapping now).

* Cleanup atapi_{in,out}put_bytes().

v2:
* Add 'struct request *rq' argument to ->ata_{in,out}put_data methods
  and don't byte-swap disk fs requests (we shouldn't un-swap fs requests
  because fs itself is stored byte-swapped on the disk) - this is how
  things were done before the patch (ideally device mapper should be
  used instead but it would break existing setups and would have some
  performance impact).

Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Michael Schmitz <schmitz@debian.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Richard Zidlicky <rz@linux-m68k.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/drivers/ide/legacy/falconide.c b/drivers/ide/legacy/falconide.c
index 56cdaa0eeea..32c044b17d4 100644
--- a/drivers/ide/legacy/falconide.c
+++ b/drivers/ide/legacy/falconide.c
@@ -44,6 +44,36 @@
 int falconide_intr_lock;
 EXPORT_SYMBOL(falconide_intr_lock);
 
+static void falconide_atapi_input_bytes(ide_drive_t *drive, void *buf,
+					unsigned int len)
+{
+	insw_swapw(drive->hwif->io_ports.data_addr, buf, (len + 1) / 2);
+}
+
+static void falconide_atapi_output_bytes(ide_drive_t *drive, void *buf,
+					 unsigned int len)
+{
+	outsw_swapw(drive->hwif->io_ports.data_addr, buf, (len + 1) / 2);
+}
+
+static void falconide_ata_input_data(ide_drive_t *drive, struct request *rq,
+				     void *buf, unsigned int wcount)
+{
+	if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
+		return insw(drive->hwif->io_ports.data_addr, buf, wcount * 2);
+
+	falconide_atapi_input_bytes(drive, buf, wcount * 4);
+}
+
+static void falconide_ata_output_data(ide_drive_t *drive, struct request *rq,
+				      void *buf, unsigned int wcount)
+{
+	if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
+		return outsw(drive->hwif->io_ports.data_addr, buf, wcount * 2);
+
+	falconide_atapi_output_bytes(drive, buf, wcount * 4);
+}
+
 static void __init falconide_setup_ports(hw_regs_t *hw)
 {
 	int i;
@@ -90,6 +120,12 @@ static int __init falconide_init(void)
 		ide_init_port_data(hwif, index);
 		ide_init_port_hw(hwif, &hw);
 
+		/* Atari has a byte-swapped IDE interface */
+		hwif->atapi_input_bytes  = falconide_atapi_input_bytes;
+		hwif->atapi_output_bytes = falconide_atapi_output_bytes;
+		hwif->ata_input_data	 = falconide_ata_input_data;
+		hwif->ata_output_data	 = falconide_ata_output_data;
+
 		ide_get_lock(NULL, NULL);
 		ide_device_add(idx, NULL);
 		ide_release_lock();