diff options
author | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2008-01-26 20:12:58 +0100 |
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committer | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2008-01-26 20:12:58 +0100 |
commit | 6ae8b1efcc83103f2e323c9486f56a8671ca1880 (patch) | |
tree | 6f8d8efffa0202450aedd2a23cb47889179f7582 /drivers/ide/pci/sl82c105.c | |
parent | 9b73e76f3cf63379dcf45fcd4f112f5812418d0a (diff) | |
download | op-kernel-dev-6ae8b1efcc83103f2e323c9486f56a8671ca1880.zip op-kernel-dev-6ae8b1efcc83103f2e323c9486f56a8671ca1880.tar.gz |
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>
Diffstat (limited to 'drivers/ide/pci/sl82c105.c')
-rw-r--r-- | drivers/ide/pci/sl82c105.c | 55 |
1 files changed, 15 insertions, 40 deletions
diff --git a/drivers/ide/pci/sl82c105.c b/drivers/ide/pci/sl82c105.c index 069f104..a854134 100644 --- a/drivers/ide/pci/sl82c105.c +++ b/drivers/ide/pci/sl82c105.c @@ -13,6 +13,7 @@ * -- Benjamin Herrenschmidt (01/11/03) benh@kernel.crashing.org * * Copyright (C) 2006-2007 MontaVista Software, Inc. <source@mvista.com> + * Copyright (C) 2007 Bartlomiej Zolnierkiewicz */ #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 |= drv_ctrl; - if (!drive->using_dma) { - /* - * 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); - } + 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, 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 |= (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); 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); ide_dma_start(drive); @@ -214,32 +203,19 @@ static void sl82c105_dma_timeout(ide_drive_t *drive) ide_dma_timeout(drive); } -static int sl82c105_ide_dma_on(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) +static int sl82c105_dma_end(ide_drive_t *drive) { struct pci_dev *dev = HWIF(drive)->pci_dev; int reg = 0x44 + drive->dn * 4; + int ret; + + DBG(("%s(drive:%s)\n", __FUNCTION__, drive->name)); - DBG(("sl82c105_dma_off_quietly(drive:%s)\n", drive->name)); + ret = __ide_dma_end(drive); 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->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_start = &sl82c105_dma_start; + hwif->ide_dma_end = &sl82c105_dma_end; hwif->dma_timeout = &sl82c105_dma_timeout; if (hwif->mate) |