1 files changed, 43 insertions, 27 deletions

diff --git a/drivers/ide/pci/sc1200.c b/drivers/ide/pci/sc1200.c
index 65dcabe4820..c989fd90f37 100644
--- a/drivers/ide/pci/sc1200.c
+++ b/drivers/ide/pci/sc1200.c
@@ -1,5 +1,5 @@
 /*
- * linux/drivers/ide/pci/sc1200.c               Version 0.93    Mar 10 2007
+ * linux/drivers/ide/pci/sc1200.c               Version 0.94    Mar 10 2007
  *
  * Copyright (C) 2000-2002              Mark Lord <mlord@pobox.com>
  * Copyright (C)      2007              Bartlomiej Zolnierkiewicz
@@ -95,6 +95,20 @@ static const unsigned int sc1200_pio_timings[4][5] =
  */
 //#define SC1200_BAD_PIO(timings) (((timings)&~0x80000000)==0x00009172)
 
+static void sc1200_tunepio(ide_drive_t *drive, u8 pio)
+{
+        ide_hwif_t *hwif = drive->hwif;
+        struct pci_dev *pdev = hwif->pci_dev;
+        unsigned int basereg = hwif->channel ? 0x50 : 0x40, format = 0;
+
+        pci_read_config_dword(pdev, basereg + 4, &format);
+        format = (format >> 31) & 1;
+        if (format)
+                format += sc1200_get_pci_clock();
+        pci_write_config_dword(pdev, basereg + ((drive->dn & 1) << 3),
+                               sc1200_pio_timings[format][pio]);
+}
+
 /*
  *      The SC1200 specifies that two drives sharing a cable cannot mix
  *      UDMA/MDMA.  It has to be one or the other, for the pair, though
@@ -124,11 +138,7 @@ out:
         return mask;
 }
 
-/*
- * sc1200_config_dma2() handles selection/setting of DMA/UDMA modes
- * for both the chipset and drive.
- */
-static int sc1200_config_dma2 (ide_drive_t *drive, int mode)
+static int sc1200_tune_chipset(ide_drive_t *drive, u8 mode)
 {
         ide_hwif_t              *hwif = HWIF(drive);
         int                     unit = drive->select.b.unit;
@@ -136,14 +146,26 @@ static int sc1200_config_dma2 (ide_drive_t *drive, int mode)
         unsigned short          pci_clock;
         unsigned int            basereg = hwif->channel ? 0x50 : 0x40;
 
+        mode = ide_rate_filter(drive, mode);
+
         /*
          * Tell the drive to switch to the new mode; abort on failure.
          */
-        if (!mode || sc1200_set_xfer_mode(drive, mode)) {
+        if (sc1200_set_xfer_mode(drive, mode)) {
                 printk("SC1200: set xfer mode failure\n");
                 return 1;       /* failure */
         }
 
+        switch (mode) {
+        case XFER_PIO_4:
+        case XFER_PIO_3:
+        case XFER_PIO_2:
+        case XFER_PIO_1:
+        case XFER_PIO_0:
+                sc1200_tunepio(drive, mode - XFER_PIO_0);
+                return 0;
+        }
+
         pci_clock = sc1200_get_pci_clock();
 
         /*
@@ -196,11 +218,9 @@ static int sc1200_config_dma2 (ide_drive_t *drive, int mode)
                                 case PCI_CLK_66:        timings = 0x00015151;   break;
                         }
                         break;
-        }
-
-        if (timings == 0) {
-                printk("%s: sc1200_config_dma: huh? mode=%02x clk=%x \n", drive->name, mode, pci_clock);
-                return 1;       /* failure */
+                default:
+                        BUG();
+                        break;
         }
 
         if (unit == 0) {                        /* are we configuring drive0? */
@@ -220,12 +240,14 @@ static int sc1200_config_dma2 (ide_drive_t *drive, int mode)
  */
 static int sc1200_config_dma (ide_drive_t *drive)
 {
-        u8 mode = 0;
+        if (ide_use_dma(drive)) {
+                u8 mode = ide_max_dma_mode(drive);
 
-        if (ide_use_dma(drive))
-                mode = ide_max_dma_mode(drive);
+                if (mode && drive->hwif->speedproc(drive, mode) == 0)
+                        return 0;
+        }
 
-        return sc1200_config_dma2(drive, mode);
+        return 1;
 }
 
 
@@ -265,8 +287,6 @@ static int sc1200_ide_dma_end (ide_drive_t *drive)
 static void sc1200_tuneproc (ide_drive_t *drive, byte pio)      /* mode=255 means "autotune" */
 {
         ide_hwif_t      *hwif = HWIF(drive);
-        unsigned int    format;
-        static byte     modes[5] = {XFER_PIO_0, XFER_PIO_1, XFER_PIO_2, XFER_PIO_3, XFER_PIO_4};
         int             mode = -1;
 
         /*
@@ -283,21 +303,16 @@ static void sc1200_tuneproc (ide_drive_t *drive, byte pio)	/* mode=255 means "au
         if (mode != -1) {
                 printk("SC1200: %s: changing (U)DMA mode\n", drive->name);
                 hwif->dma_off_quietly(drive);
-                if (sc1200_config_dma2(drive, mode) == 0)
+                if (sc1200_tune_chipset(drive, mode) == 0)
                         hwif->dma_host_on(drive);
                 return;
         }
 
         pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
         printk("SC1200: %s: setting PIO mode%d\n", drive->name, pio);
-        if (!sc1200_set_xfer_mode(drive, modes[pio])) {
-                unsigned int basereg = hwif->channel ? 0x50 : 0x40;
-                pci_read_config_dword (hwif->pci_dev, basereg+4, &format);
-                format = (format >> 31) & 1;
-                if (format)
-                        format += sc1200_get_pci_clock();
-                pci_write_config_dword(hwif->pci_dev, basereg + (drive->select.b.unit << 3), sc1200_pio_timings[format][pio]);
-        }
+
+        if (sc1200_set_xfer_mode(drive, XFER_PIO_0 + pio) == 0)
+                sc1200_tunepio(drive, pio);
 }
 
 #ifdef CONFIG_PM
@@ -447,6 +462,7 @@ static void __devinit init_hwif_sc1200 (ide_hwif_t *hwif)
                 if (!noautodma)
                         hwif->autodma = 1;
                 hwif->tuneproc = &sc1200_tuneproc;
+                hwif->speedproc = &sc1200_tune_chipset;
         }
         hwif->atapi_dma = 1;
         hwif->ultra_mask = 0x07;