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281 lines
6.6 KiB
281 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* ACPI PATA driver |
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* |
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* (c) 2007 Red Hat |
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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 <linux/gfp.h> |
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#include <linux/acpi.h> |
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#include <linux/libata.h> |
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#include <linux/ata.h> |
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#include <scsi/scsi_host.h> |
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#define DRV_NAME "pata_acpi" |
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#define DRV_VERSION "0.2.3" |
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struct pata_acpi { |
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struct ata_acpi_gtm gtm; |
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void *last; |
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unsigned long mask[2]; |
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}; |
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/** |
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* pacpi_pre_reset - check for 40/80 pin |
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* @link: ATA link |
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* @deadline: deadline jiffies for the operation |
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* |
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* Perform the PATA port setup we need. |
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*/ |
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static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline) |
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{ |
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struct ata_port *ap = link->ap; |
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struct pata_acpi *acpi = ap->private_data; |
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if (ACPI_HANDLE(&ap->tdev) == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0) |
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return -ENODEV; |
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return ata_sff_prereset(link, deadline); |
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} |
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/** |
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* pacpi_cable_detect - cable type detection |
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* @ap: port to detect |
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* |
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* Perform device specific cable detection |
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*/ |
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static int pacpi_cable_detect(struct ata_port *ap) |
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{ |
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struct pata_acpi *acpi = ap->private_data; |
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if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA)) |
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return ATA_CBL_PATA80; |
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else |
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return ATA_CBL_PATA40; |
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} |
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/** |
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* pacpi_discover_modes - filter non ACPI modes |
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* @ap: ATA port |
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* @adev: ATA device |
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* |
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* Try the modes available and see which ones the ACPI method will |
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* set up sensibly. From this we get a mask of ACPI modes we can use |
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*/ |
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static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev) |
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{ |
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struct pata_acpi *acpi = ap->private_data; |
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struct ata_acpi_gtm probe; |
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unsigned int xfer_mask; |
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probe = acpi->gtm; |
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ata_acpi_gtm(ap, &probe); |
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xfer_mask = ata_acpi_gtm_xfermask(adev, &probe); |
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if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA)) |
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ap->cbl = ATA_CBL_PATA80; |
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return xfer_mask; |
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} |
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/** |
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* pacpi_mode_filter - mode filter for ACPI |
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* @adev: device |
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* @mask: mask of valid modes |
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* |
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* Filter the valid mode list according to our own specific rules, in |
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* this case the list of discovered valid modes obtained by ACPI probing |
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*/ |
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static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask) |
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{ |
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struct pata_acpi *acpi = adev->link->ap->private_data; |
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return mask & acpi->mask[adev->devno]; |
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} |
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/** |
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* pacpi_set_piomode - set initial PIO mode data |
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* @ap: ATA interface |
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* @adev: ATA device |
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*/ |
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static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev) |
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{ |
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int unit = adev->devno; |
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struct pata_acpi *acpi = ap->private_data; |
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const struct ata_timing *t; |
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if (!(acpi->gtm.flags & 0x10)) |
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unit = 0; |
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/* Now stuff the nS values into the structure */ |
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t = ata_timing_find_mode(adev->pio_mode); |
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acpi->gtm.drive[unit].pio = t->cycle; |
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ata_acpi_stm(ap, &acpi->gtm); |
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/* See what mode we actually got */ |
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ata_acpi_gtm(ap, &acpi->gtm); |
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} |
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/** |
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* pacpi_set_dmamode - set initial DMA mode data |
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* @ap: ATA interface |
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* @adev: ATA device |
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*/ |
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static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev) |
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{ |
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int unit = adev->devno; |
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struct pata_acpi *acpi = ap->private_data; |
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const struct ata_timing *t; |
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if (!(acpi->gtm.flags & 0x10)) |
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unit = 0; |
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/* Now stuff the nS values into the structure */ |
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t = ata_timing_find_mode(adev->dma_mode); |
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if (adev->dma_mode >= XFER_UDMA_0) { |
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acpi->gtm.drive[unit].dma = t->udma; |
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acpi->gtm.flags |= (1 << (2 * unit)); |
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} else { |
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acpi->gtm.drive[unit].dma = t->cycle; |
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acpi->gtm.flags &= ~(1 << (2 * unit)); |
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} |
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ata_acpi_stm(ap, &acpi->gtm); |
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/* See what mode we actually got */ |
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ata_acpi_gtm(ap, &acpi->gtm); |
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} |
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/** |
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* pacpi_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. |
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*/ |
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static unsigned int pacpi_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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struct pata_acpi *acpi = ap->private_data; |
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if (acpi->gtm.flags & 0x10) |
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return ata_bmdma_qc_issue(qc); |
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if (adev != acpi->last) { |
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pacpi_set_piomode(ap, adev); |
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if (ata_dma_enabled(adev)) |
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pacpi_set_dmamode(ap, adev); |
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acpi->last = adev; |
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} |
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return ata_bmdma_qc_issue(qc); |
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} |
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/** |
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* pacpi_port_start - port setup |
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* @ap: ATA port being set up |
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* |
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* Use the port_start hook to maintain private control structures |
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*/ |
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static int pacpi_port_start(struct ata_port *ap) |
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{ |
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struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
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struct pata_acpi *acpi; |
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if (ACPI_HANDLE(&ap->tdev) == NULL) |
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return -ENODEV; |
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acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL); |
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if (ap->private_data == NULL) |
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return -ENOMEM; |
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acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]); |
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acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]); |
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return ata_bmdma_port_start(ap); |
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} |
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static struct scsi_host_template pacpi_sht = { |
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ATA_BMDMA_SHT(DRV_NAME), |
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}; |
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static struct ata_port_operations pacpi_ops = { |
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.inherits = &ata_bmdma_port_ops, |
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.qc_issue = pacpi_qc_issue, |
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.cable_detect = pacpi_cable_detect, |
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.mode_filter = pacpi_mode_filter, |
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.set_piomode = pacpi_set_piomode, |
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.set_dmamode = pacpi_set_dmamode, |
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.prereset = pacpi_pre_reset, |
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.port_start = pacpi_port_start, |
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}; |
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/** |
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* pacpi_init_one - Register ACPI ATA PCI device with kernel services |
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* @pdev: PCI device to register |
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* @id: PCI device ID |
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* |
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* Called from kernel PCI layer. |
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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 pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id) |
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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_MWDMA2, |
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.udma_mask = ATA_UDMA6, |
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.port_ops = &pacpi_ops, |
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}; |
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const struct ata_port_info *ppi[] = { &info, NULL }; |
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if (pdev->vendor == PCI_VENDOR_ID_ATI) { |
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int rc = pcim_enable_device(pdev); |
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if (rc < 0) |
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return rc; |
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pcim_pin_device(pdev); |
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} |
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return ata_pci_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0); |
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} |
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static const struct pci_device_id pacpi_pci_tbl[] = { |
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{ PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1}, |
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{ } /* terminate list */ |
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}; |
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static struct pci_driver pacpi_pci_driver = { |
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.name = DRV_NAME, |
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.id_table = pacpi_pci_tbl, |
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.probe = pacpi_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(pacpi_pci_driver); |
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MODULE_AUTHOR("Alan Cox"); |
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MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode"); |
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MODULE_LICENSE("GPL"); |
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MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl); |
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MODULE_VERSION(DRV_VERSION);
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