cs5530/sc1200: add ->udma_filter methods

CS5530/SC1200 specifies that two drives on the same cable cannot mix
UDMA/MDMA.  Add {cs5530,sc1200}_udma_filter() to handle this.  This also
makes it possible to remove open-coded best DMA mode selection and use
standard ide_use_dma()/ide_max_dma_mode() helpers.  While at it bump
version numbers.

There should be no functionality changes caused by this patch.

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

1 files changed, 54 insertions, 66 deletions

diff --git a/drivers/ide/pci/cs5530.c b/drivers/ide/pci/cs5530.c
index b2d7c132ef4b..845500115f3c 100644
--- a/drivers/ide/pci/cs5530.c
+++ b/drivers/ide/pci/cs5530.c
@@ -1,10 +1,10 @@
 /*
- * linux/drivers/ide/pci/cs5530.c               Version 0.7     Sept 10, 2002
+ * linux/drivers/ide/pci/cs5530.c               Version 0.71    Mar 10 2007
  *
  * Copyright (C) 2000                   Andre Hedrick <andre@linux-ide.org>
- * Ditto of GNU General Public License.
- *
  * Copyright (C) 2000                   Mark Lord <mlord@pobox.com>
+ * Copyright (C) 2007                   Bartlomiej Zolnierkiewicz
+ *
  * May be copied or modified under the terms of the GNU General Public License
  *
  * Development of this chipset driver was funded
@@ -88,79 +88,66 @@ static void cs5530_tuneproc (ide_drive_t *drive, u8 pio)	/* pio=255 means "autot
 }
 
 /**
- *      cs5530_config_dma       -       select/set DMA and UDMA modes
+ *      cs5530_udma_filter      -       UDMA filter
+ *      @drive: drive
+ *
+ *      cs5530_udma_filter() does UDMA mask filtering for the given drive
+ *      taking into the consideration capabilities of the mate device.
+ *
+ *      The CS5530 specifies that two drives sharing a cable cannot mix
+ *      UDMA/MDMA.  It has to be one or the other, for the pair, though
+ *      different timings can still be chosen for each drive.  We could
+ *      set the appropriate timing bits on the fly, but that might be
+ *      a bit confusing.  So, for now we statically handle this requirement
+ *      by looking at our mate drive to see what it is capable of, before
+ *      choosing a mode for our own drive.
+ *
+ *      Note: This relies on the fact we never fail from UDMA to MWDMA2
+ *      but instead drop to PIO.
+ */
+
+static u8 cs5530_udma_filter(ide_drive_t *drive)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        ide_drive_t *mate = &hwif->drives[(drive->dn & 1) ^ 1];
+        struct hd_driveid *mateid = mate->id;
+        u8 mask = hwif->ultra_mask;
+
+        if (mate->present == 0)
+                goto out;
+
+        if ((mateid->capability & 1) && __ide_dma_bad_drive(mate) == 0) {
+                if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
+                        goto out;
+                if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
+                        mask = 0;
+        }
+out:
+        return mask;
+}
+
+/**
+ *      cs5530_config_dma       -       set DMA/UDMA mode
  *      @drive: drive to tune
  *
- *      cs5530_config_dma() handles selection/setting of DMA/UDMA modes
- *      for both the chipset and drive. The CS5530 has limitations about
- *      mixing DMA/UDMA on the same cable.
+ *      cs5530_config_dma() handles setting of DMA/UDMA mode
+ *      for both the chipset and drive.
  */
- 
-static int cs5530_config_dma (ide_drive_t *drive)
+
+static int cs5530_config_dma(ide_drive_t *drive)
 {
-        int                     udma_ok = 1, mode = 0;
-        ide_hwif_t              *hwif = HWIF(drive);
-        int                     unit = drive->select.b.unit;
-        ide_drive_t             *mate = &hwif->drives[unit^1];
-        struct hd_driveid       *id = drive->id;
-        unsigned int            reg, timings = 0;
-        unsigned long           basereg;
+        ide_hwif_t *hwif = drive->hwif;
+        unsigned int reg, timings = 0;
+        unsigned long basereg;
+        u8 unit = drive->dn & 1, mode = 0;
 
         /*
          * Default to DMA-off in case we run into trouble here.
          */
         hwif->dma_off_quietly(drive);
 
-        /*
-         * The CS5530 specifies that two drives sharing a cable cannot
-         * mix UDMA/MDMA.  It has to be one or the other, for the pair,
-         * though different timings can still be chosen for each drive.
-         * We could set the appropriate timing bits on the fly,
-         * but that might be a bit confusing.  So, for now we statically
-         * handle this requirement by looking at our mate drive to see
-         * what it is capable of, before choosing a mode for our own drive.
-         *
-         * Note: This relies on the fact we never fail from UDMA to MWDMA_2
-         * but instead drop to PIO
-         */
-        if (mate->present) {
-                struct hd_driveid *mateid = mate->id;
-                if (mateid && (mateid->capability & 1) &&
-                    !__ide_dma_bad_drive(mate)) {
-                        if ((mateid->field_valid & 4) &&
-                            (mateid->dma_ultra & 7))
-                                udma_ok = 1;
-                        else if ((mateid->field_valid & 2) &&
-                                 (mateid->dma_mword & 7))
-                                udma_ok = 0;
-                        else
-                                udma_ok = 1;
-                }
-        }
-
-        /*
-         * Now see what the current drive is capable of,
-         * selecting UDMA only if the mate said it was ok.
-         */
-        if (id && (id->capability & 1) && drive->autodma &&
-            !__ide_dma_bad_drive(drive)) {
-                if (udma_ok && (id->field_valid & 4) && (id->dma_ultra & 7)) {
-                        if      (id->dma_ultra & 4)
-                                mode = XFER_UDMA_2;
-                        else if (id->dma_ultra & 2)
-                                mode = XFER_UDMA_1;
-                        else if (id->dma_ultra & 1)
-                                mode = XFER_UDMA_0;
-                }
-                if (!mode && (id->field_valid & 2) && (id->dma_mword & 7)) {
-                        if      (id->dma_mword & 4)
-                                mode = XFER_MW_DMA_2;
-                        else if (id->dma_mword & 2)
-                                mode = XFER_MW_DMA_1;
-                        else if (id->dma_mword & 1)
-                                mode = XFER_MW_DMA_0;
-                }
-        }
+        if (ide_use_dma(drive))
+                mode = ide_max_dma_mode(drive);
 
         /*
          * Tell the drive to switch to the new mode; abort on failure.
@@ -332,6 +319,7 @@ static void __devinit init_hwif_cs5530 (ide_hwif_t *hwif)
         hwif->ultra_mask = 0x07;
         hwif->mwdma_mask = 0x07;
 
+        hwif->udma_filter = cs5530_udma_filter;
         hwif->ide_dma_check = &cs5530_config_dma;
         if (!noautodma)
                 hwif->autodma = 1;