ide: add ide_find_port() helper

* Add ide_find_port() helper.

* Convert icside, rapide and ide_platform host drivers to use it.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 15741367eb35..ce6644f41b21 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -265,6 +265,30 @@ static int ide_system_bus_speed(void)
         return system_bus_speed;
 }
 
+ide_hwif_t * ide_find_port(unsigned long base)
+{
+        ide_hwif_t *hwif;
+        int i;
+
+        for (i = 0; i < MAX_HWIFS; i++) {
+                hwif = &ide_hwifs[i];
+                if (hwif->io_ports[IDE_DATA_OFFSET] == base)
+                        goto found;
+        }
+
+        for (i = 0; i < MAX_HWIFS; i++) {
+                hwif = &ide_hwifs[i];
+                if (hwif->io_ports[IDE_DATA_OFFSET] == 0)
+                        goto found;
+        }
+
+        hwif = NULL;
+found:
+        return hwif;
+}
+
+EXPORT_SYMBOL_GPL(ide_find_port);
+
 static struct resource* hwif_request_region(ide_hwif_t *hwif,
                                             unsigned long addr, int num)
 {