lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/ide/pci/it8213.c
View File

@ -17,22 +17,6 @@
#include <asm/io.h>
/*
* it8213_ratemask - Compute available modes
* @drive: IDE drive
*
* Compute the available speeds for the devices on the interface. This
* is all modes to ATA133 clipped by drive cable setup.
*/
static u8 it8213_ratemask (ide_drive_t *drive)
{
u8 mode = 4;
if (!eighty_ninty_three(drive))
mode = min_t(u8, mode, 1);
return mode;
}
/**
* it8213_dma_2_pio - return the PIO mode matching DMA
* @xfer_rate: transfer speed
@ -145,7 +129,7 @@ static int it8213_tune_chipset (ide_drive_t *drive, u8 xferspeed)
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = hwif->pci_dev;
u8 maslave = 0x40;
u8 speed = ide_rate_filter(it8213_ratemask(drive), xferspeed);
u8 speed = ide_rate_filter(drive, xferspeed);
int a_speed = 3 << (drive->dn * 4);
int u_flag = 1 << drive->dn;
int v_flag = 0x01 << drive->dn;
@ -222,7 +206,7 @@ static int it8213_tune_chipset (ide_drive_t *drive, u8 xferspeed)
static int config_chipset_for_dma (ide_drive_t *drive)
{
u8 speed = ide_dma_speed(drive, it8213_ratemask(drive));
u8 speed = ide_max_dma_mode(drive);
if (!speed)
return 0;