ide: move ide_config_drive_speed() calls to upper layers (take 2)

* Convert {ide_hwif_t,ide_pci_device_t}->host_flag to be u16.

* Add IDE_HFLAG_POST_SET_MODE host flag to indicate the need to program 
  the host for the transfer mode after programming the device.  Set it
  in au1xxx-ide, amd74xx, cs5530, cs5535, pdc202xx_new, sc1200, pmac
  and via82cxxx host drivers.

* Add IDE_HFLAG_NO_SET_MODE host flag to indicate the need to completely
  skip programming of host/device for the transfer mode ("smart" hosts).
  Set it in it821x host driver and check it in ide_tune_dma().

* Add ide_set_pio_mode()/ide_set_dma_mode() helpers and convert all
  direct ->set_pio_mode/->speedproc users to use these helpers.

* Move ide_config_drive_speed() calls from ->set_pio_mode/->speedproc
  methods to callers.

* Rename ->speedproc method to ->set_dma_mode, make it void and update
  all implementations accordingly.

* Update ide_set_xfer_rate() comments.

* Unexport ide_config_drive_speed().

v2:
* Fix issues noticed by Sergei:
  - export ide_set_dma_mode() instead of moving ->set_pio_mode abuse wrt
    to setting DMA modes from sc1200_set_pio_mode() to do_special()
  - check IDE_HFLAG_NO_SET_MODE in ide_tune_dma()
  - check for (hwif->set_pio_mode) == NULL in ide_set_pio_mode()
  - check for (hwif->set_dma_mode) == NULL in ide_set_dma_mode()
  - return -1 from ide_set_{pio,dma}_mode() if ->set_{pio,dma}_mode == NULL
  - don't set ->set_{pio,dma}_mode on it821x in "smart" mode
  - fix build problem in pmac.c
  - minor fixes in au1xxx-ide.c/cs5530.c/siimage.c
  - improve patch description

Changes in behavior caused by this patch:
- HDIO_SET_PIO_MODE ioctl would now return -ENOSYS for attempts to change
  PIO mode if it821x controller is in "smart" mode
- removal of two debugging printk-s (from cs5530.c and sc1200.c)
- transfer modes 0x00-0x07 passed from user space may be programmed twice on
  the device (not really an issue since 0x00 is not supported correctly by
  any host driver ATM, 0x01 is not supported at all and 0x02-0x07 are invalid)

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

1 files changed, 29 insertions, 61 deletions

diff --git a/drivers/ide/pci/it821x.c b/drivers/ide/pci/it821x.c
index 758a98230cc..1b69d82478c 100644
--- a/drivers/ide/pci/it821x.c
+++ b/drivers/ide/pci/it821x.c
@@ -229,24 +229,24 @@ static void it821x_clock_strategy(ide_drive_t *drive)
 }
 
 /**
- *      it821x_tunepio  -       tune a drive
- *      @drive: drive to tune
- *      @pio: the desired PIO mode
+ *      it821x_set_pio_mode     -       set host controller for PIO mode
+ *      @drive: drive
+ *      @pio: PIO mode number
  *
- *      Try to tune the drive/host to the desired PIO mode taking into
- *      the consideration the maximum PIO mode supported by the other
- *      device on the cable.
+ *      Tune the host to the desired PIO mode taking into the consideration
+ *      the maximum PIO mode supported by the other device on the cable.
  */
 
-static int it821x_tunepio(ide_drive_t *drive, u8 set_pio)
+static void it821x_set_pio_mode(ide_drive_t *drive, const u8 pio)
 {
         ide_hwif_t *hwif        = drive->hwif;
         struct it821x_dev *itdev = ide_get_hwifdata(hwif);
         int unit = drive->select.b.unit;
         ide_drive_t *pair = &hwif->drives[1 - unit];
+        u8 set_pio = pio;
 
         /* Spec says 89 ref driver uses 88 */
-        static u16 pio[]        = { 0xAA88, 0xA382, 0xA181, 0x3332, 0x3121 };
+        static u16 pio_timings[]= { 0xAA88, 0xA382, 0xA181, 0x3332, 0x3121 };
         static u8 pio_want[]    = { ATA_66, ATA_66, ATA_66, ATA_66, ATA_ANY };
 
         /*
@@ -261,22 +261,12 @@ static int it821x_tunepio(ide_drive_t *drive, u8 set_pio)
                         set_pio = pair_pio;
         }
 
-        if (itdev->smart)
-                return 0;
-
         /* We prefer 66Mhz clock for PIO 0-3, don't care for PIO4 */
         itdev->want[unit][1] = pio_want[set_pio];
         itdev->want[unit][0] = 1;       /* PIO is lowest priority */
-        itdev->pio[unit] = pio[set_pio];
+        itdev->pio[unit] = pio_timings[set_pio];
         it821x_clock_strategy(drive);
         it821x_program(drive, itdev->pio[unit]);
-
-        return ide_config_drive_speed(drive, XFER_PIO_0 + set_pio);
-}
-
-static void it821x_set_pio_mode(ide_drive_t *drive, const u8 pio)
-{
-        (void)it821x_tunepio(drive, pio);
 }
 
 /**
@@ -405,47 +395,24 @@ static int it821x_dma_end(ide_drive_t *drive)
 }
 
 /**
- *      it821x_tune_chipset     -       set controller timings
- *      @drive: Drive to set up
- *      @speed: speed we want to achieve
+ *      it821x_set_dma_mode     -       set host controller for DMA mode
+ *      @drive: drive
+ *      @speed: DMA mode
  *
- *      Tune the ITE chipset for the desired mode.
+ *      Tune the ITE chipset for the desired DMA mode.
  */
 
-static int it821x_tune_chipset(ide_drive_t *drive, const u8 speed)
+static void it821x_set_dma_mode(ide_drive_t *drive, const u8 speed)
 {
-
-        ide_hwif_t *hwif        = drive->hwif;
-        struct it821x_dev *itdev = ide_get_hwifdata(hwif);
-
-        if (itdev->smart == 0) {
-                switch (speed) {
-                        /* MWDMA tuning is really hard because our MWDMA and PIO
-                           timings are kept in the same place. We can switch in the
-                           host dma on/off callbacks */
-                        case XFER_MW_DMA_2:
-                        case XFER_MW_DMA_1:
-                        case XFER_MW_DMA_0:
-                                it821x_tune_mwdma(drive, (speed - XFER_MW_DMA_0));
-                                break;
-                        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:
-                                it821x_tune_udma(drive, (speed - XFER_UDMA_0));
-                                break;
-                        default:
-                                return 1;
-                }
-
-                return ide_config_drive_speed(drive, speed);
-        }
-
-        /* don't touch anything in the smart mode */
-        return 0;
+        /*
+         * MWDMA tuning is really hard because our MWDMA and PIO
+         * timings are kept in the same place.  We can switch in the
+         * host dma on/off callbacks.
+         */
+        if (speed >= XFER_UDMA_0 && speed <= XFER_UDMA_6)
+                it821x_tune_udma(drive, speed - XFER_UDMA_0);
+        else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)
+                it821x_tune_mwdma(drive, speed - XFER_MW_DMA_0);
 }
 
 /**
@@ -629,14 +596,15 @@ static void __devinit init_hwif_it821x(ide_hwif_t *hwif)
                         printk(KERN_WARNING "it821x: Revision 0x10, workarounds activated.\n");
         }
 
-        hwif->speedproc = &it821x_tune_chipset;
-        hwif->set_pio_mode = &it821x_set_pio_mode;
+        if (idev->smart == 0) {
+                hwif->set_pio_mode = &it821x_set_pio_mode;
+                hwif->set_dma_mode = &it821x_set_dma_mode;
 
-        /* MWDMA/PIO clock switching for pass through mode */
-        if(!idev->smart) {
+                /* MWDMA/PIO clock switching for pass through mode */
                 hwif->dma_start = &it821x_dma_start;
                 hwif->ide_dma_end = &it821x_dma_end;
-        }
+        } else
+                hwif->host_flags |= IDE_HFLAG_NO_SET_MODE;
 
         hwif->drives[0].autotune = 1;
         hwif->drives[1].autotune = 1;