atiixp: DMA setup fixes

* Fix handling of unsupported/invalid modes in atiixp_set_dma_mode().

* ATI controllers allow separate PIO and DMA timings so remove programming
  of PIO modes from atiixp_set_dma_mode().  Also remove no longer needed
  atiixp_dma_2_pio() helper.

* SWDMA timings are not programmed by atiixp_set_dma_mode() and if SWDMA
  mode is chosen atiixp_dma_host_on() erroneously enables UDMA, just disable
  support for SWDMA modes for now.

* Enable support for MWDMA0 mode.

* Bump driver version.

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

1 files changed, 5 insertions, 48 deletions

diff --git a/drivers/ide/pci/atiixp.c b/drivers/ide/pci/atiixp.c
index 0eb97f021d39..14a61b1c80ac 100644
--- a/drivers/ide/pci/atiixp.c
+++ b/drivers/ide/pci/atiixp.c
@@ -1,5 +1,5 @@
 /*
- *  linux/drivers/ide/pci/atiixp.c      Version 0.02    Jun 16 2007
+ *  linux/drivers/ide/pci/atiixp.c      Version 0.03    Aug 3 2007
  *
  *  Copyright (C) 2003 ATI Inc. <hyu@ati.com>
  *  Copyright (C) 2004,2007 Bartlomiej Zolnierkiewicz
@@ -47,43 +47,6 @@ static int save_mdma_mode[4];
 
 static DEFINE_SPINLOCK(atiixp_lock);
 
-/**
- *      atiixp_dma_2_pio                -       return the PIO mode matching DMA
- *      @xfer_rate: transfer speed
- *
- *      Returns the nearest equivalent PIO timing for the PIO or DMA
- *      mode requested by the controller.
- */
-
-static u8 atiixp_dma_2_pio(u8 xfer_rate) {
-        switch(xfer_rate) {
-                case XFER_UDMA_6:
-                case XFER_UDMA_5:
-                case XFER_UDMA_4:
-                case XFER_UDMA_3:
-                case XFER_UDMA_2:
-                case XFER_UDMA_1:
-                case XFER_UDMA_0:
-                case XFER_MW_DMA_2:
-                case XFER_PIO_4:
-                        return 4;
-                case XFER_MW_DMA_1:
-                case XFER_PIO_3:
-                        return 3;
-                case XFER_SW_DMA_2:
-                case XFER_PIO_2:
-                        return 2;
-                case XFER_MW_DMA_0:
-                case XFER_SW_DMA_1:
-                case XFER_SW_DMA_0:
-                case XFER_PIO_1:
-                case XFER_PIO_0:
-                case XFER_PIO_SLOW:
-                default:
-                        return 0;
-        }
-}
-
 static void atiixp_dma_host_on(ide_drive_t *drive)
 {
         struct pci_dev *dev = drive->hwif->pci_dev;
@@ -169,7 +132,9 @@ static void atiixp_set_dma_mode(ide_drive_t *drive, const u8 speed)
         int timing_shift = (drive->dn & 2) ? 16 : 0 + (drive->dn & 1) ? 0 : 8;
         u32 tmp32;
         u16 tmp16;
-        u8 pio;
+
+        if (speed < XFER_MW_DMA_0)
+                return;
 
         spin_lock_irqsave(&atiixp_lock, flags);
 
@@ -191,13 +156,6 @@ static void atiixp_set_dma_mode(ide_drive_t *drive, const u8 speed)
         }
 
         spin_unlock_irqrestore(&atiixp_lock, flags);
-
-        if (speed >= XFER_SW_DMA_0)
-                pio = atiixp_dma_2_pio(speed);
-        else
-                pio = speed - XFER_PIO_0;
-
-        atiixp_set_pio_mode(drive, pio);
 }
 
 /**
@@ -249,8 +207,7 @@ static void __devinit init_hwif_atiixp(ide_hwif_t *hwif)
 
         hwif->atapi_dma = 1;
         hwif->ultra_mask = 0x3f;
-        hwif->mwdma_mask = 0x06;
-        hwif->swdma_mask = 0x04;
+        hwif->mwdma_mask = 0x07;
 
         pci_read_config_byte(pdev, ATIIXP_IDE_UDMA_MODE + ch, &udma_mode);