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ide: remove dead Virtual DMA support

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Lets remove dead Virtual DMA support for now so it doesn't clutter
core IDE code (it can be bring back when there is a need for it):

* Remove IDE_HFLAG_VDMA host flag.

* Remove ide_drive_t.vdma flag.

* cs5520.c: remove stale FIXMEs, cs5520_dma_host_set() and cs5520_dma_ops
  (also there is no longer a need to set IDE_HFLAG_NO_ATAPI_DMA).

There should be no functional changes caused by this patch.

Cc: TAKADA Yoshihito <takada@mbf.nifty.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-07-23 19:55:55 +02:00
parent 472b4bc1af
commit ba4b2e607e
5 changed files with 4 additions and 39 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/ide/ide-disk.c
View File

@ -158,7 +158,7 @@ static void ide_tf_set_cmd(ide_drive_t *drive, ide_task_t *task, u8 dma)
write = (task->tf_flags & IDE_TFLAG_WRITE) ? 1 : 0;
if (dma)
index = drive->vdma ? 4 : 8;
index = 8;
else
index = drive->mult_count ? 0 : 4;

5
drivers/ide/ide-dma.c
View File

@ -756,9 +756,8 @@ static int ide_tune_dma(ide_drive_t *drive)
static int ide_dma_check(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
int vdma = (hwif->host_flags & IDE_HFLAG_VDMA)? 1 : 0;
if (!vdma && ide_tune_dma(drive))
if (ide_tune_dma(drive))
return 0;
/* TODO: always do PIO fallback */
@ -767,7 +766,7 @@ static int ide_dma_check(ide_drive_t *drive)
ide_set_max_pio(drive);
return vdma ? 0 : -1;
return -1;
}
int ide_id_dma_bug(ide_drive_t *drive)

3
drivers/ide/ide-iops.c
View File

@ -866,8 +866,7 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed)
skip:
#ifdef CONFIG_BLK_DEV_IDEDMA
if ((speed >= XFER_SW_DMA_0 || (hwif->host_flags & IDE_HFLAG_VDMA)) &&
drive->using_dma)
if (speed >= XFER_SW_DMA_0 && drive->using_dma)
hwif->dma_ops->dma_host_set(drive, 1);
else if (hwif->dma_ops) /* check if host supports DMA */
ide_dma_off_quietly(drive);

30
drivers/ide/pci/cs5520.c
View File

@ -62,8 +62,6 @@ static void cs5520_set_pio_mode(ide_drive_t *drive, const u8 pio)
struct pci_dev *pdev = to_pci_dev(hwif->dev);
int controller = drive->dn > 1 ? 1 : 0;
/* FIXME: if DMA = 1 do we need to set the DMA bit here ? */
/* 8bit CAT/CRT - 8bit command timing for channel */
pci_write_config_byte(pdev, 0x62 + controller,
(cs5520_pio_clocks[pio].recovery << 4) |
@ -89,45 +87,17 @@ static void cs5520_set_dma_mode(ide_drive_t *drive, const u8 speed)
cs5520_set_pio_mode(drive, 0);
}
/*
* We wrap the DMA activate to set the vdma flag. This is needed
* so that the IDE DMA layer issues PIO not DMA commands over the
* DMA channel
*
* ATAPI is harder so disable it for now using IDE_HFLAG_NO_ATAPI_DMA
*/
static void cs5520_dma_host_set(ide_drive_t *drive, int on)
{
drive->vdma = on;
ide_dma_host_set(drive, on);
}
static const struct ide_port_ops cs5520_port_ops = {
.set_pio_mode = cs5520_set_pio_mode,
.set_dma_mode = cs5520_set_dma_mode,
};
static const struct ide_dma_ops cs5520_dma_ops = {
.dma_host_set = cs5520_dma_host_set,
.dma_setup = ide_dma_setup,
.dma_exec_cmd = ide_dma_exec_cmd,
.dma_start = ide_dma_start,
.dma_end = __ide_dma_end,
.dma_test_irq = ide_dma_test_irq,
.dma_lost_irq = ide_dma_lost_irq,
.dma_timeout = ide_dma_timeout,
};
/* FIXME: VDMA is disabled because it caused system hangs */
#define DECLARE_CS_DEV(name_str) \
{ \
.name = name_str, \
.port_ops = &cs5520_port_ops, \
.dma_ops = &cs5520_dma_ops, \
.host_flags = IDE_HFLAG_ISA_PORTS | \
IDE_HFLAG_CS5520 | \
IDE_HFLAG_NO_ATAPI_DMA | \
IDE_HFLAG_ABUSE_SET_DMA_MODE, \
.pio_mask = ATA_PIO4, \
}

3
include/linux/ide.h
View File

@ -355,7 +355,6 @@ typedef struct ide_drive_s {
unsigned nodma : 1; /* disallow DMA */
unsigned remap_0_to_1 : 1; /* 0=noremap, 1=remap 0->1 (for EZDrive) */
unsigned blocked : 1; /* 1=powermanagment told us not to do anything, so sleep nicely */
unsigned vdma : 1; /* 1=doing PIO over DMA 0=doing normal DMA */
unsigned scsi : 1; /* 0=default, 1=ide-scsi emulation */
unsigned sleeping : 1; /* 1=sleeping & sleep field valid */
unsigned post_reset : 1;
@ -1097,8 +1096,6 @@ enum {
IDE_HFLAG_NO_IO_32BIT = (1 << 30),
/* never unmask IRQs */
IDE_HFLAG_NO_UNMASK_IRQS = (1 << 31),
/* host uses VDMA (disabled for now) */
IDE_HFLAG_VDMA = 0,
};
#ifdef CONFIG_BLK_DEV_OFFBOARD