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, 12 insertions, 5 deletions

diff --git a/include/linux/ide.h b/include/linux/ide.h
index a7d8b4bc7681..02a27e8cbad2 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -681,7 +681,7 @@ typedef struct hwif_s {
         u8 straight8;   /* Alan's straight 8 check */
         u8 bus_state;   /* power state of the IDE bus */
 
-        u8 host_flags;
+        u16 host_flags;
 
         u8 pio_mask;
 
@@ -702,10 +702,10 @@ typedef struct hwif_s {
 #if 0
         ide_hwif_ops_t  *hwifops;
 #else
-        /* routine to set PIO mode for drives */
+        /* routine to program host for PIO mode */
         void    (*set_pio_mode)(ide_drive_t *, const u8);
-        /* routine to retune DMA modes for drives */
-        int     (*speedproc)(ide_drive_t *, const u8);
+        /* routine to program host for DMA mode */
+        void    (*set_dma_mode)(ide_drive_t *, const u8);
         /* tweaks hardware to select drive */
         void    (*selectproc)(ide_drive_t *);
         /* chipset polling based on hba specifics */
@@ -1257,6 +1257,10 @@ enum {
          * for hosts which have separate PIO and DMA timings (ie. PMAC)
          */
         IDE_HFLAG_SET_PIO_MODE_KEEP_DMA = (1 << 7),
+        /* program host for the transfer mode after programming device */
+        IDE_HFLAG_POST_SET_MODE         = (1 << 8),
+        /* don't program host/device for the transfer mode ("smart" hosts) */
+        IDE_HFLAG_NO_SET_MODE           = (1 << 9),
 };
 
 typedef struct ide_pci_device_s {
@@ -1273,7 +1277,7 @@ typedef struct ide_pci_device_s {
         u8                      bootable;
         unsigned int            extra;
         struct ide_pci_device_s *next;
-        u8                      host_flags;
+        u16                     host_flags;
         u8                      pio_mask;
         u8                      udma_mask;
 } ide_pci_device_t;
@@ -1414,6 +1418,9 @@ unsigned int ide_pio_cycle_time(ide_drive_t *, u8);
 u8 ide_get_best_pio_mode(ide_drive_t *, u8, u8);
 extern const ide_pio_timings_t ide_pio_timings[6];
 
+int ide_set_pio_mode(ide_drive_t *, u8);
+int ide_set_dma_mode(ide_drive_t *, u8);
+
 void ide_set_pio(ide_drive_t *, u8);
 
 static inline void ide_set_max_pio(ide_drive_t *drive)