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253 lines
6.6 KiB
253 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* pata_radisys.c - Intel PATA/SATA controllers |
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* |
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* (C) 2006 Red Hat <[email protected]> |
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* |
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* Some parts based on ata_piix.c by Jeff Garzik and others. |
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* |
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* A PIIX relative, this device has a single ATA channel and no |
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* slave timings, SITRE or PPE. In that sense it is a close relative |
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* of the original PIIX. It does however support UDMA 33/66 per channel |
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* although no other modes/timings. Also lacking is 32bit I/O on the ATA |
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* port. |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/pci.h> |
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#include <linux/blkdev.h> |
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <scsi/scsi_host.h> |
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#include <linux/libata.h> |
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#include <linux/ata.h> |
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#define DRV_NAME "pata_radisys" |
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#define DRV_VERSION "0.4.4" |
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/** |
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* radisys_set_piomode - Initialize host controller PATA PIO timings |
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* @ap: ATA port |
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* @adev: Device whose timings we are configuring |
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* |
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* Set PIO mode for device, in host controller PCI config space. |
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* |
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* LOCKING: |
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* None (inherited from caller). |
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*/ |
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static void radisys_set_piomode (struct ata_port *ap, struct ata_device *adev) |
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{ |
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unsigned int pio = adev->pio_mode - XFER_PIO_0; |
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struct pci_dev *dev = to_pci_dev(ap->host->dev); |
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u16 idetm_data; |
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int control = 0; |
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/* |
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* See Intel Document 298600-004 for the timing programing rules |
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* for PIIX/ICH. Note that the early PIIX does not have the slave |
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* timing port at 0x44. The Radisys is a relative of the PIIX |
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* but not the same so be careful. |
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*/ |
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static const /* ISP RTC */ |
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u8 timings[][2] = { { 0, 0 }, /* Check me */ |
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{ 0, 0 }, |
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{ 1, 1 }, |
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{ 2, 2 }, |
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{ 3, 3 }, }; |
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if (pio > 0) |
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control |= 1; /* TIME1 enable */ |
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if (ata_pio_need_iordy(adev)) |
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control |= 2; /* IE IORDY */ |
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pci_read_config_word(dev, 0x40, &idetm_data); |
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/* Enable IE and TIME as appropriate. Clear the other |
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drive timing bits */ |
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idetm_data &= 0xCCCC; |
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idetm_data |= (control << (4 * adev->devno)); |
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idetm_data |= (timings[pio][0] << 12) | |
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(timings[pio][1] << 8); |
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pci_write_config_word(dev, 0x40, idetm_data); |
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/* Track which port is configured */ |
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ap->private_data = adev; |
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} |
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/** |
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* radisys_set_dmamode - Initialize host controller PATA DMA timings |
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* @ap: Port whose timings we are configuring |
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* @adev: Device to program |
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* |
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* Set MWDMA mode for device, in host controller PCI config space. |
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* |
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* LOCKING: |
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* None (inherited from caller). |
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*/ |
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static void radisys_set_dmamode (struct ata_port *ap, struct ata_device *adev) |
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{ |
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struct pci_dev *dev = to_pci_dev(ap->host->dev); |
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u16 idetm_data; |
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u8 udma_enable; |
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static const /* ISP RTC */ |
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u8 timings[][2] = { { 0, 0 }, |
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{ 0, 0 }, |
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{ 1, 1 }, |
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{ 2, 2 }, |
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{ 3, 3 }, }; |
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/* |
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* MWDMA is driven by the PIO timings. We must also enable |
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* IORDY unconditionally. |
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*/ |
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pci_read_config_word(dev, 0x40, &idetm_data); |
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pci_read_config_byte(dev, 0x48, &udma_enable); |
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if (adev->dma_mode < XFER_UDMA_0) { |
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unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0; |
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const unsigned int needed_pio[3] = { |
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XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 |
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}; |
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int pio = needed_pio[mwdma] - XFER_PIO_0; |
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int control = 3; /* IORDY|TIME0 */ |
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/* If the drive MWDMA is faster than it can do PIO then |
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we must force PIO0 for PIO cycles. */ |
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if (adev->pio_mode < needed_pio[mwdma]) |
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control = 1; |
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/* Mask out the relevant control and timing bits we will load. Also |
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clear the other drive TIME register as a precaution */ |
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idetm_data &= 0xCCCC; |
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idetm_data |= control << (4 * adev->devno); |
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idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8); |
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udma_enable &= ~(1 << adev->devno); |
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} else { |
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u8 udma_mode; |
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/* UDMA66 on: UDMA 33 and 66 are switchable via register 0x4A */ |
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pci_read_config_byte(dev, 0x4A, &udma_mode); |
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if (adev->xfer_mode == XFER_UDMA_2) |
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udma_mode &= ~(2 << (adev->devno * 4)); |
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else /* UDMA 4 */ |
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udma_mode |= (2 << (adev->devno * 4)); |
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pci_write_config_byte(dev, 0x4A, udma_mode); |
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udma_enable |= (1 << adev->devno); |
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} |
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pci_write_config_word(dev, 0x40, idetm_data); |
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pci_write_config_byte(dev, 0x48, udma_enable); |
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/* Track which port is configured */ |
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ap->private_data = adev; |
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} |
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/** |
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* radisys_qc_issue - command issue |
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* @qc: command pending |
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* |
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* Called when the libata layer is about to issue a command. We wrap |
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* this interface so that we can load the correct ATA timings if |
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* necessary. Our logic also clears TIME0/TIME1 for the other device so |
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* that, even if we get this wrong, cycles to the other device will |
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* be made PIO0. |
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*/ |
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static unsigned int radisys_qc_issue(struct ata_queued_cmd *qc) |
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{ |
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struct ata_port *ap = qc->ap; |
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struct ata_device *adev = qc->dev; |
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if (adev != ap->private_data) { |
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/* UDMA timing is not shared */ |
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if (adev->dma_mode < XFER_UDMA_0) { |
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if (adev->dma_mode) |
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radisys_set_dmamode(ap, adev); |
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else if (adev->pio_mode) |
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radisys_set_piomode(ap, adev); |
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} |
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} |
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return ata_bmdma_qc_issue(qc); |
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} |
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static struct scsi_host_template radisys_sht = { |
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ATA_BMDMA_SHT(DRV_NAME), |
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}; |
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static struct ata_port_operations radisys_pata_ops = { |
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.inherits = &ata_bmdma_port_ops, |
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.qc_issue = radisys_qc_issue, |
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.cable_detect = ata_cable_unknown, |
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.set_piomode = radisys_set_piomode, |
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.set_dmamode = radisys_set_dmamode, |
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}; |
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/** |
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* radisys_init_one - Register PIIX ATA PCI device with kernel services |
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* @pdev: PCI device to register |
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* @ent: Entry in radisys_pci_tbl matching with @pdev |
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* |
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* Called from kernel PCI layer. We probe for combined mode (sigh), |
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* and then hand over control to libata, for it to do the rest. |
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* |
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* LOCKING: |
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* Inherited from PCI layer (may sleep). |
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* |
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* RETURNS: |
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* Zero on success, or -ERRNO value. |
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*/ |
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static int radisys_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) |
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{ |
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static const struct ata_port_info info = { |
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.flags = ATA_FLAG_SLAVE_POSS, |
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.pio_mask = ATA_PIO4, |
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.mwdma_mask = ATA_MWDMA12_ONLY, |
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.udma_mask = ATA_UDMA24_ONLY, |
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.port_ops = &radisys_pata_ops, |
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}; |
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const struct ata_port_info *ppi[] = { &info, NULL }; |
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ata_print_version_once(&pdev->dev, DRV_VERSION); |
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return ata_pci_bmdma_init_one(pdev, ppi, &radisys_sht, NULL, 0); |
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} |
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static const struct pci_device_id radisys_pci_tbl[] = { |
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{ PCI_VDEVICE(RADISYS, 0x8201), }, |
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{ } /* terminate list */ |
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}; |
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static struct pci_driver radisys_pci_driver = { |
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.name = DRV_NAME, |
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.id_table = radisys_pci_tbl, |
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.probe = radisys_init_one, |
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.remove = ata_pci_remove_one, |
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#ifdef CONFIG_PM_SLEEP |
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.suspend = ata_pci_device_suspend, |
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.resume = ata_pci_device_resume, |
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#endif |
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}; |
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module_pci_driver(radisys_pci_driver); |
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MODULE_AUTHOR("Alan Cox"); |
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MODULE_DESCRIPTION("SCSI low-level driver for Radisys R82600 controllers"); |
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MODULE_LICENSE("GPL"); |
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MODULE_DEVICE_TABLE(pci, radisys_pci_tbl); |
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MODULE_VERSION(DRV_VERSION);
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