C++ (Cpp) slc90e66_dma_2_pio Examples

Example #1

File: slc90e66.c Project: prime5711/blackbox

static int slc90e66_tune_chipset (ide_drive_t *drive, u8 xferspeed)
{
	ide_hwif_t *hwif	= HWIF(drive);
	struct pci_dev *dev	= hwif->pci_dev;
	u8 maslave		= hwif->channel ? 0x42 : 0x40;
	u8 speed	= ide_rate_filter(slc90e66_ratemask(drive), xferspeed);
	int sitre = 0, a_speed	= 7 << (drive->dn * 4);
	int u_speed = 0, u_flag = 1 << drive->dn;
	u16			reg4042, reg44, reg48, reg4a;

	pci_read_config_word(dev, maslave, &reg4042);
	sitre = (reg4042 & 0x4000) ? 1 : 0;
	pci_read_config_word(dev, 0x44, &reg44);
	pci_read_config_word(dev, 0x48, &reg48);
	pci_read_config_word(dev, 0x4a, &reg4a);

	switch(speed) {
#ifdef CONFIG_BLK_DEV_IDEDMA
		case XFER_UDMA_4:	u_speed = 4 << (drive->dn * 4); break;
		case XFER_UDMA_3:	u_speed = 3 << (drive->dn * 4); break;
		case XFER_UDMA_2:	u_speed = 2 << (drive->dn * 4); break;
		case XFER_UDMA_1:	u_speed = 1 << (drive->dn * 4); break;
		case XFER_UDMA_0:	u_speed = 0 << (drive->dn * 4); break;
		case XFER_MW_DMA_2:
		case XFER_MW_DMA_1:
		case XFER_SW_DMA_2:	break;
#endif /* CONFIG_BLK_DEV_IDEDMA */
		case XFER_PIO_4:
		case XFER_PIO_3:
		case XFER_PIO_2:
		case XFER_PIO_0:        break;
		default:		return -1;
	}

	if (speed >= XFER_UDMA_0) {
		if (!(reg48 & u_flag))
			pci_write_config_word(dev, 0x48, reg48|u_flag);
		/* FIXME: (reg4a & a_speed) ? */
		if ((reg4a & u_speed) != u_speed) {
			pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
			pci_read_config_word(dev, 0x4a, &reg4a);
			pci_write_config_word(dev, 0x4a, reg4a|u_speed);
		}
	} else {
		if (reg48 & u_flag)
			pci_write_config_word(dev, 0x48, reg48 & ~u_flag);
		if (reg4a & a_speed)
			pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
	}

	slc90e66_tune_drive(drive, slc90e66_dma_2_pio(speed));
	return (ide_config_drive_speed(drive, speed));
}

Example #2

static int slc90e66_config_drive_for_dma (ide_drive_t *drive)
{
    u8 speed = ide_dma_speed(drive, slc90e66_ratemask(drive));

    if (!(speed)) {
        u8 tspeed = ide_get_best_pio_mode(drive, 255, 5, NULL);
        speed = slc90e66_dma_2_pio(XFER_PIO_0 + tspeed);
    }

    (void) slc90e66_tune_chipset(drive, speed);
    return ide_dma_enable(drive);
}