1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/ide/legacy/q40ide.c b/drivers/ide/legacy/q40ide.c
index f9210458aea0..6f535d00e638 100644
--- a/drivers/ide/legacy/q40ide.c
+++ b/drivers/ide/legacy/q40ide.c
@@ -72,7 +72,27 @@ static void q40_ide_setup_ports(hw_regs_t *hw, unsigned long base,
         hw->ack_intr = ack_intr;
 }
 
+static void q40ide_input_data(ide_drive_t *drive, struct request *rq,
+                              void *buf, unsigned int len)
+{
+        unsigned long data_addr = drive->hwif->io_ports.data_addr;
+
+        if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
+                return insw(data_addr, buf, (len + 1) / 2);
 
+        insw_swapw(data_addr, buf, (len + 1) / 2);
+}
+
+static void q40ide_output_data(ide_drive_t *drive, struct request *rq,
+                               void *buf, unsigned int len)
+{
+        unsigned long data_addr = drive->hwif->io_ports.data_addr;
+
+        if (drive->media == ide_disk && rq && rq->cmd_type == REQ_TYPE_FS)
+                return outsw(data_addr, buf, (len + 1) / 2);
+
+        outsw_swapw(data_addr, buf, (len + 1) / 2);
+}
 
 /* 
  * the static array is needed to have the name reported in /proc/ioports,
@@ -123,6 +143,10 @@ static int __init q40ide_init(void)
                 ide_init_port_data(hwif, hwif->index);
                 ide_init_port_hw(hwif, &hw);
 
+                /* Q40 has a byte-swapped IDE interface */
+                hwif->input_data  = q40ide_input_data;
+                hwif->output_data = q40ide_output_data;
+
                 idx[i] = hwif->index;
         }
     }