scc_pata: add ->dma_host_set and ->dma_start methods

Add ->dma_host_set and ->dma_start methods (+ __scc_dma_end() helper)
so scc_ide_{in,out}b() can be used directly.

There should be no functional changes caused by this patch.

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 50 insertions, 4 deletions

diff --git a/drivers/ide/pci/scc_pata.c b/drivers/ide/pci/scc_pata.c
index a17f73ec577a..144938188325 100644
--- a/drivers/ide/pci/scc_pata.c
+++ b/drivers/ide/pci/scc_pata.c
@@ -260,6 +260,20 @@ static void scc_set_dma_mode(ide_drive_t *drive, const u8 speed)
         out_be32((void __iomem *)udenvt_port, reg);
 }
 
+static void scc_dma_host_set(ide_drive_t *drive, int on)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        u8 unit = (drive->select.b.unit & 0x01);
+        u8 dma_stat = scc_ide_inb(hwif->dma_status);
+
+        if (on)
+                dma_stat |= (1 << (5 + unit));
+        else
+                dma_stat &= ~(1 << (5 + unit));
+
+        scc_ide_outb(dma_stat, hwif->dma_status);
+}
+
 /**
  *      scc_ide_dma_setup       -       begin a DMA phase
  *      @drive: target device
@@ -304,13 +318,45 @@ static int scc_dma_setup(ide_drive_t *drive)
         return 0;
 }
 
+static void scc_dma_start(ide_drive_t *drive)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        u8 dma_cmd = scc_ide_inb(hwif->dma_command);
+
+        /* start DMA */
+        scc_ide_outb(dma_cmd | 1, hwif->dma_command);
+        hwif->dma = 1;
+        wmb();
+}
+
+static int __scc_dma_end(ide_drive_t *drive)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        u8 dma_stat, dma_cmd;
+
+        drive->waiting_for_dma = 0;
+        /* get DMA command mode */
+        dma_cmd = scc_ide_inb(hwif->dma_command);
+        /* stop DMA */
+        scc_ide_outb(dma_cmd & ~1, hwif->dma_command);
+        /* get DMA status */
+        dma_stat = scc_ide_inb(hwif->dma_status);
+        /* clear the INTR & ERROR bits */
+        scc_ide_outb(dma_stat | 6, hwif->dma_status);
+        /* purge DMA mappings */
+        ide_destroy_dmatable(drive);
+        /* verify good DMA status */
+        hwif->dma = 0;
+        wmb();
+        return (dma_stat & 7) != 4 ? (0x10 | dma_stat) : 0;
+}
 
 /**
  *      scc_dma_end     -       Stop DMA
  *      @drive: IDE drive
  *
  *      Check and clear INT Status register.
- *      Then call __ide_dma_end().
+ *      Then call __scc_dma_end().
  */
 
 static int scc_dma_end(ide_drive_t *drive)
@@ -414,7 +460,7 @@ static int scc_dma_end(ide_drive_t *drive)
                 break;
         }
 
-        dma_stat = __ide_dma_end(drive);
+        dma_stat = __scc_dma_end(drive);
         if (data_loss)
                 dma_stat |= 2; /* emulate DMA error (to retry command) */
         return dma_stat;
@@ -811,10 +857,10 @@ static const struct ide_port_ops scc_port_ops = {
 };
 
 static const struct ide_dma_ops scc_dma_ops = {
-        .dma_host_set           = ide_dma_host_set,
+        .dma_host_set           = scc_dma_host_set,
         .dma_setup              = scc_dma_setup,
         .dma_exec_cmd           = ide_dma_exec_cmd,
-        .dma_start              = ide_dma_start,
+        .dma_start              = scc_dma_start,
         .dma_end                = scc_dma_end,
         .dma_test_irq           = scc_dma_test_irq,
         .dma_lost_irq           = ide_dma_lost_irq,