1 // SPDX-License-Identifier: GPL-2.0-only
3  *    pata_radisys.c - Intel PATA/SATA controllers
30  *	radisys_set_piomode - Initialize host controller PATA PIO timings
34  *	Set PIO mode for device, in host controller PCI config space.
42 	unsigned int pio	= adev->pio_mode - XFER_PIO_0;  in radisys_set_piomode()  local
43 	struct pci_dev *dev	= to_pci_dev(ap->host->dev);  in radisys_set_piomode()
48 	 *	See Intel Document 298600-004 for the timing programing rules  in radisys_set_piomode()
61 	if (pio > 0)  in radisys_set_piomode()
71 	idetm_data |= (control << (4 * adev->devno));  in radisys_set_piomode()
72 	idetm_data |= (timings[pio][0] << 12) |  in radisys_set_piomode()
73 			(timings[pio][1] << 8);  in radisys_set_piomode()
77 	ap->private_data = adev;  in radisys_set_piomode()
81  *	radisys_set_dmamode - Initialize host controller PATA DMA timings
85  *	Set MWDMA mode for device, in host controller PCI config space.
93 	struct pci_dev *dev	= to_pci_dev(ap->host->dev);  in radisys_set_dmamode()
105 	 * MWDMA is driven by the PIO timings. We must also enable  in radisys_set_dmamode()
112 	if (adev->dma_mode < XFER_UDMA_0) {  in radisys_set_dmamode()
113 		unsigned int mwdma	= adev->dma_mode - XFER_MW_DMA_0;  in radisys_set_dmamode()
117 		int pio = needed_pio[mwdma] - XFER_PIO_0;  in radisys_set_dmamode()  local
120 		/* If the drive MWDMA is faster than it can do PIO then  in radisys_set_dmamode()
121 		   we must force PIO0 for PIO cycles. */  in radisys_set_dmamode()
123 		if (adev->pio_mode < needed_pio[mwdma])  in radisys_set_dmamode()
130 		idetm_data |= control << (4 * adev->devno);  in radisys_set_dmamode()
131 		idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);  in radisys_set_dmamode()
133 		udma_enable &= ~(1 << adev->devno);  in radisys_set_dmamode()
141 		if (adev->xfer_mode == XFER_UDMA_2)  in radisys_set_dmamode()
142 			udma_mode &= ~(2 << (adev->devno * 4));  in radisys_set_dmamode()
144 			udma_mode |= (2 << (adev->devno * 4));  in radisys_set_dmamode()
148 		udma_enable |= (1 << adev->devno);  in radisys_set_dmamode()
154 	ap->private_data = adev;  in radisys_set_dmamode()
158  *	radisys_qc_issue	-	command issue
170 	struct ata_port *ap = qc->ap;  in radisys_qc_issue()
171 	struct ata_device *adev = qc->dev;  in radisys_qc_issue()
173 	if (adev != ap->private_data) {  in radisys_qc_issue()
175 		if (adev->dma_mode < XFER_UDMA_0 || !ata_dma_enabled(adev)) {  in radisys_qc_issue()
178 			else if (adev->pio_mode)  in radisys_qc_issue()
200  *	radisys_init_one - Register PIIX ATA PCI device with kernel services
204  *	Called from kernel PCI layer.  We probe for combined mode (sigh),
211  *	Zero on success, or -ERRNO value.
225 	ata_print_version_once(&pdev->dev, DRV_VERSION);  in radisys_init_one()
250 MODULE_DESCRIPTION("SCSI low-level driver for Radisys R82600 controllers");