From 7569e8dc2213ecc47024ea5edbadc8736487d926 Mon Sep 17 00:00:00 2001 From: Bartlomiej Zolnierkiewicz Date: Sat, 17 Feb 2007 02:40:25 +0100 Subject: ide: add ide_use_fast_pio() helper (v3) * add ide_use_fast_pio() helper for use by host drivers * add DMA capability and hwif->autodma checks to ide_use_dma() - au1xxx-ide/it8213/it821x drivers didn't check for (id->capability & 1) [ for the IT8211/2 in SMART mode this check shouldn't be made but since in it821x_fixups() we set DMA bit explicitly: if(strstr(id->model, "Integrated Technology Express")) { /* In raid mode the ident block is slightly buggy We need to set the bits so that the IDE layer knows LBA28. LBA48 and DMA ar valid */ id->capability |= 3; /* LBA28, DMA */ we are better off using generic helper if we can ] - ide-cris driver didn't set ->autodma [ before the patch hwif->autodma was only checked in the chipset specific hwif->ide_dma_check implementations, for ide-cris it is cris_dma_check() function so there no behavior change here ] v2: * updated patch description (thanks to Alan Cox for the feedback) v3: * updated for scc_pata driver Signed-off-by: Bartlomiej Zolnierkiewicz --- drivers/ide/ide-lib.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'drivers/ide/ide-lib.c') diff --git a/drivers/ide/ide-lib.c b/drivers/ide/ide-lib.c index bea5e13ee361..8afce4ceea31 100644 --- a/drivers/ide/ide-lib.c +++ b/drivers/ide/ide-lib.c @@ -205,6 +205,21 @@ int ide_dma_enable (ide_drive_t *drive) EXPORT_SYMBOL(ide_dma_enable); +int ide_use_fast_pio(ide_drive_t *drive) +{ + struct hd_driveid *id = drive->id; + + if ((id->capability & 1) && drive->autodma) + return 1; + + if ((id->capability & 8) || (id->field_valid & 2)) + return 1; + + return 0; +} + +EXPORT_SYMBOL_GPL(ide_use_fast_pio); + /* * Standard (generic) timings for PIO modes, from ATA2 specification. * These timings are for access to the IDE data port register *only*. -- cgit v1.2.3