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sl82c105: program DMA/PIO timings in ->dma_start/->ide_dma_end 

* Program DMA timings in sl82c105_dma_start() (->dma_start method)
  before starting DMA transfer.

* Add sl82c105_dma_end() (->ide_dma_end method) to switch back to
  PIO timings when DMA transfer is complete.

* In sl82c105_set_pio_mode() program timings regardless of ->using_dma
  setting and in sl82c105_set_dma_mode() only cache the new timings.

* Remove no longer needed sl82c105_{ide_dma_on,off_quietly}().

Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-01-26 20:12:58 +01:00
parent 9b73e76f3c
commit 6ae8b1efcc
1 changed files with 15 additions and 40 deletions
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55
drivers/ide/pci/sl82c105.c
View File

@ -13,6 +13,7 @@
* -- Benjamin Herrenschmidt (01/11/03) benh@kernel.crashing.org * -- Benjamin Herrenschmidt (01/11/03) benh@kernel.crashing.org
* *
* Copyright (C) 2006-2007 MontaVista Software, Inc. <source@mvista.com> * Copyright (C) 2006-2007 MontaVista Software, Inc. <source@mvista.com>
* Copyright (C) 2007 Bartlomiej Zolnierkiewicz
*/ */
#include <linux/types.h> #include <linux/types.h>
@ -90,14 +91,8 @@ static void sl82c105_set_pio_mode(ide_drive_t *drive, const u8 pio)
drive->drive_data &= 0xffff0000; drive->drive_data &= 0xffff0000;
drive->drive_data |= drv_ctrl; drive->drive_data |= drv_ctrl;
if (!drive->using_dma) { pci_write_config_word(dev, reg, drv_ctrl);
/* pci_read_config_word (dev, reg, &drv_ctrl);
* If we are actually using MW DMA, then we can not
* reprogram the interface drive control register.
*/
pci_write_config_word(dev, reg, drv_ctrl);
pci_read_config_word (dev, reg, &drv_ctrl);
}
printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name, printk(KERN_DEBUG "%s: selected %s (%dns) (%04X)\n", drive->name,
ide_xfer_verbose(pio + XFER_PIO_0), ide_xfer_verbose(pio + XFER_PIO_0),
@ -123,17 +118,6 @@ static void sl82c105_set_dma_mode(ide_drive_t *drive, const u8 speed)
*/ */
drive->drive_data &= 0x0000ffff; drive->drive_data &= 0x0000ffff;
drive->drive_data |= (unsigned long)drv_ctrl << 16; drive->drive_data |= (unsigned long)drv_ctrl << 16;
/*
* If we are already using DMA, we just reprogram
* the drive control register.
*/
if (drive->using_dma) {
struct pci_dev *dev = HWIF(drive)->pci_dev;
int reg = 0x44 + drive->dn * 4;
pci_write_config_word(dev, reg, drv_ctrl);
}
} }
/* /*
@ -201,6 +185,11 @@ static void sl82c105_dma_start(ide_drive_t *drive)
{ {
ide_hwif_t *hwif = HWIF(drive); ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = hwif->pci_dev; struct pci_dev *dev = hwif->pci_dev;
int reg = 0x44 + drive->dn * 4;
DBG(("%s(drive:%s)\n", __FUNCTION__, drive->name));
pci_write_config_word(dev, reg, drive->drive_data >> 16);
sl82c105_reset_host(dev); sl82c105_reset_host(dev);
ide_dma_start(drive); ide_dma_start(drive);
@ -214,32 +203,19 @@ static void sl82c105_dma_timeout(ide_drive_t *drive)
ide_dma_timeout(drive); ide_dma_timeout(drive);
} }
static int sl82c105_ide_dma_on(ide_drive_t *drive) static int sl82c105_dma_end(ide_drive_t *drive)
{
struct pci_dev *dev = HWIF(drive)->pci_dev;
int rc, reg = 0x44 + drive->dn * 4;
DBG(("sl82c105_ide_dma_on(drive:%s)\n", drive->name));
rc = __ide_dma_on(drive);
if (rc == 0) {
pci_write_config_word(dev, reg, drive->drive_data >> 16);
printk(KERN_INFO "%s: DMA enabled\n", drive->name);
}
return rc;
}
static void sl82c105_dma_off_quietly(ide_drive_t *drive)
{ {
struct pci_dev *dev = HWIF(drive)->pci_dev; struct pci_dev *dev = HWIF(drive)->pci_dev;
int reg = 0x44 + drive->dn * 4; int reg = 0x44 + drive->dn * 4;
int ret;
DBG(("sl82c105_dma_off_quietly(drive:%s)\n", drive->name)); DBG(("%s(drive:%s)\n", __FUNCTION__, drive->name));
ret = __ide_dma_end(drive);
pci_write_config_word(dev, reg, drive->drive_data); pci_write_config_word(dev, reg, drive->drive_data);
ide_dma_off_quietly(drive); return ret;
} }
/* /*
@ -369,10 +345,9 @@ static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
hwif->mwdma_mask = ATA_MWDMA2; hwif->mwdma_mask = ATA_MWDMA2;
hwif->ide_dma_on = &sl82c105_ide_dma_on;
hwif->dma_off_quietly = &sl82c105_dma_off_quietly;
hwif->dma_lost_irq = &sl82c105_dma_lost_irq; hwif->dma_lost_irq = &sl82c105_dma_lost_irq;
hwif->dma_start = &sl82c105_dma_start; hwif->dma_start = &sl82c105_dma_start;
hwif->ide_dma_end = &sl82c105_dma_end;
hwif->dma_timeout = &sl82c105_dma_timeout; hwif->dma_timeout = &sl82c105_dma_timeout;
if (hwif->mate) if (hwif->mate)