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ide: rework the code for selecting the best DMA transfer mode (v3)

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Depends on the "ide: fix UDMA/MWDMA/SWDMA masks" patch.

* add ide_hwif_t.udma_filter hook for filtering UDMA mask
  (use it in alim15x3, hpt366, siimage and serverworks drivers)
* add ide_max_dma_mode() for finding best DMA mode for the device
  (loosely based on some older libata-core.c code)
* convert ide_dma_speed() users to use ide_max_dma_mode()
* make ide_rate_filter() take "ide_drive_t *drive" as an argument instead
  of "u8 mode" and teach it to how to use UDMA mask to do filtering
* use ide_rate_filter() in hpt366 driver
* remove no longer needed ide_dma_speed() and *_ratemask()
* unexport eighty_ninty_three()

v2:
* rename ->filter_udma_mask to ->udma_filter
  [ Suggested by Sergei Shtylyov <sshtylyov@ru.mvista.com>. ]

v3:
* updated for scc_pata driver (fixes XFER_UDMA_6 filtering for user-space
  originated transfer mode change requests when 100MHz clock is used)

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz
2007-05-10 00:01:08 +02:00
parent 1813720723
commit 2d5eaa6dd7
27 changed files with 236 additions and 574 deletions
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20
drivers/ide/pci/cs5535.c
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@@ -127,20 +127,6 @@ static void cs5535_set_speed(ide_drive_t *drive, u8 speed)
}
}
static u8 cs5535_ratemask(ide_drive_t *drive)
{
/* eighty93 will return 1 if it's 80core and capable of
exceeding udma2, 0 otherwise. we need ratemask to set
the max speed and if we can > udma2 then we return 2
which selects speed_max as udma4 which is the 5535's max
speed, and 1 selects udma2 which is the max for 40c */
if (!eighty_ninty_three(drive))
return 1;
return 2;
}
/****
* cs5535_set_drive - Configure the drive to the new speed
* @drive: Drive to set up
@@ -151,7 +137,7 @@ static u8 cs5535_ratemask(ide_drive_t *drive)
*/
static int cs5535_set_drive(ide_drive_t *drive, u8 speed)
{
speed = ide_rate_filter(cs5535_ratemask(drive), speed);
speed = ide_rate_filter(drive, speed);
ide_config_drive_speed(drive, speed);
cs5535_set_speed(drive, speed);
@@ -180,9 +166,7 @@ static void cs5535_tuneproc(ide_drive_t *drive, u8 xferspeed)
static int cs5535_config_drive_for_dma(ide_drive_t *drive)
{
u8 speed;
speed = ide_dma_speed(drive, cs5535_ratemask(drive));
u8 speed = ide_max_dma_mode(drive);
/* If no DMA speed was available then let dma_check hit pio */
if (!speed) {