serverworks: always tune PIO

* Always set ->autotune so PIO gets correctly auto-tuned (previously
  ->autotune was only set when ->dma_base wasn't available, however
  ->ide_dma_check()/->speedproc() was always trying to tune PIO when
  tuning DMA).

* Move code responsible for programming chipset for PIO mode from
  svwks_tune_chipset() to svwks_tune_pio().  Don't tune PIO when tuning
  DMA (this is no longer needed since ->autotune is always set now).

* Handle PIO modes early in svwks_tune_chipset() so DMA configuration
  registers don't get cleared when programming PIO mode.

* Bump driver version.

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

1 files changed, 36 insertions, 40 deletions

diff --git a/drivers/ide/pci/serverworks.c b/drivers/ide/pci/serverworks.c
index 809deb92bc1..011245246b1 100644
--- a/drivers/ide/pci/serverworks.c
+++ b/drivers/ide/pci/serverworks.c
@@ -1,5 +1,5 @@
 /*
- * linux/drivers/ide/pci/serverworks.c          Version 0.20    Jun 3 2007
+ * linux/drivers/ide/pci/serverworks.c          Version 0.21    Jun 16 2007
  *
  * Copyright (C) 1998-2000 Michel Aubry
  * Copyright (C) 1998-2000 Andrzej Krzysztofowicz
@@ -123,23 +123,45 @@ static u8 svwks_csb_check (struct pci_dev *dev)
         }
         return 0;
 }
+
+static void svwks_tune_pio(ide_drive_t *drive, const u8 pio)
+{
+        static const u8 pio_modes[] = { 0x5d, 0x47, 0x34, 0x22, 0x20 };
+        static const u8 drive_pci[] = { 0x41, 0x40, 0x43, 0x42 };
+
+        struct pci_dev *dev = drive->hwif->pci_dev;
+
+        pci_write_config_byte(dev, drive_pci[drive->dn], pio_modes[pio]);
+
+        if (svwks_csb_check(dev)) {
+                u16 csb_pio = 0;
+
+                pci_read_config_word(dev, 0x4a, &csb_pio);
+
+                csb_pio &= ~(0x0f << (4 * drive->dn));
+                csb_pio |= (pio << (4 * drive->dn));
+
+                pci_write_config_word(dev, 0x4a, csb_pio);
+        }
+}
+
 static int svwks_tune_chipset (ide_drive_t *drive, u8 xferspeed)
 {
         static const u8 udma_modes[]            = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05 };
         static const u8 dma_modes[]             = { 0x77, 0x21, 0x20 };
-        static const u8 pio_modes[]             = { 0x5d, 0x47, 0x34, 0x22, 0x20 };
-        static const u8 drive_pci[]             = { 0x41, 0x40, 0x43, 0x42 };
         static const u8 drive_pci2[]            = { 0x45, 0x44, 0x47, 0x46 };
 
         ide_hwif_t *hwif        = HWIF(drive);
         struct pci_dev *dev     = hwif->pci_dev;
         u8 speed                = ide_rate_filter(drive, xferspeed);
-        u8 pio                  = ide_get_best_pio_mode(drive, 255, 4, NULL);
         u8 unit                 = (drive->select.b.unit & 0x01);
-        u8 csb5                 = svwks_csb_check(dev);
-        u8 ultra_enable         = 0, ultra_timing = 0;
-        u8 dma_timing           = 0, pio_timing = 0;
-        u16 csb5_pio            = 0;
+
+        u8 ultra_enable  = 0, ultra_timing = 0, dma_timing = 0;
+
+        if (speed >= XFER_PIO_0 && speed <= XFER_PIO_4) {
+                svwks_tune_pio(drive, speed - XFER_PIO_0);
+                return ide_config_drive_speed(drive, speed);
+        }
 
         /* If we are about to put a disk into UDMA mode we screwed up.
            Our code assumes we never _ever_ do this on an OSB4 */
@@ -149,31 +171,15 @@ static int svwks_tune_chipset (ide_drive_t *drive, u8 xferspeed)
                         BUG();
 
         pci_read_config_byte(dev, (0x56|hwif->channel), &ultra_timing);
-        pci_read_config_word(dev, 0x4A, &csb5_pio);
         pci_read_config_byte(dev, 0x54, &ultra_enable);
 
         ultra_timing    &= ~(0x0F << (4*unit));
         ultra_enable    &= ~(0x01 << drive->dn);
-        csb5_pio        &= ~(0x0F << (4*drive->dn));
 
         switch(speed) {
-                case XFER_PIO_4:
-                case XFER_PIO_3:
-                case XFER_PIO_2:
-                case XFER_PIO_1:
-                case XFER_PIO_0:
-                        pio_timing |= pio_modes[speed - XFER_PIO_0];
-                        csb5_pio   |= ((speed - XFER_PIO_0) << (4*drive->dn));
-                        break;
-
                 case XFER_MW_DMA_2:
                 case XFER_MW_DMA_1:
                 case XFER_MW_DMA_0:
-                        /*
-                         * TODO: always setup PIO mode so this won't be needed
-                         */
-                        pio_timing |= pio_modes[pio];
-                        csb5_pio   |= (pio << (4*drive->dn));
                         dma_timing |= dma_modes[speed - XFER_MW_DMA_0];
                         break;
 
@@ -183,11 +189,6 @@ static int svwks_tune_chipset (ide_drive_t *drive, u8 xferspeed)
                 case XFER_UDMA_2:
                 case XFER_UDMA_1:
                 case XFER_UDMA_0:
-                        /*
-                         * TODO: always setup PIO mode so this won't be needed
-                         */
-                        pio_timing   |= pio_modes[pio];
-                        csb5_pio     |= (pio << (4*drive->dn));
                         dma_timing   |= dma_modes[2];
                         ultra_timing |= ((udma_modes[speed - XFER_UDMA_0]) << (4*unit));
                         ultra_enable |= (0x01 << drive->dn);
@@ -195,10 +196,6 @@ static int svwks_tune_chipset (ide_drive_t *drive, u8 xferspeed)
                         break;
         }
 
-        pci_write_config_byte(dev, drive_pci[drive->dn], pio_timing);
-        if (csb5)
-                pci_write_config_word(dev, 0x4A, csb5_pio);
-
         pci_write_config_byte(dev, drive_pci2[drive->dn], dma_timing);
         pci_write_config_byte(dev, (0x56|hwif->channel), ultra_timing);
         pci_write_config_byte(dev, 0x54, ultra_enable);
@@ -209,7 +206,8 @@ static int svwks_tune_chipset (ide_drive_t *drive, u8 xferspeed)
 static void svwks_tune_drive (ide_drive_t *drive, u8 pio)
 {
         pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
-        (void)svwks_tune_chipset(drive, XFER_PIO_0 + pio);
+        svwks_tune_pio(drive, pio);
+        (void)ide_config_drive_speed(drive, XFER_PIO_0 + pio);
 }
 
 static int svwks_config_drive_xfer_rate (ide_drive_t *drive)
@@ -407,11 +405,11 @@ static void __devinit init_hwif_svwks (ide_hwif_t *hwif)
 
         hwif->autodma = 0;
 
-        if (!hwif->dma_base) {
-                hwif->drives[0].autotune = 1;
-                hwif->drives[1].autotune = 1;
+        hwif->drives[0].autotune = 1;
+        hwif->drives[1].autotune = 1;
+
+        if (!hwif->dma_base)
                 return;
-        }
 
         hwif->ide_dma_check = &svwks_config_drive_xfer_rate;
         if (hwif->pci_dev->device != PCI_DEVICE_ID_SERVERWORKS_OSB4IDE) {
@@ -424,8 +422,6 @@ static void __devinit init_hwif_svwks (ide_hwif_t *hwif)
         dma_stat = inb(hwif->dma_status);
         hwif->drives[0].autodma = (dma_stat & 0x20);
         hwif->drives[1].autodma = (dma_stat & 0x40);
-        hwif->drives[0].autotune = (!(dma_stat & 0x20));
-        hwif->drives[1].autotune = (!(dma_stat & 0x40));
 }
 
 static int __devinit init_setup_svwks (struct pci_dev *dev, ide_pci_device_t *d)