/* * ACPI PATA driver * * (c) 2007 Red Hat */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/init.h> #include <linux/blkdev.h> #include <linux/delay.h> #include <linux/device.h> #include <scsi/scsi_host.h> #include <acpi/acpi_bus.h> #include <linux/libata.h> #include <linux/ata.h> #define DRV_NAME "pata_acpi" #define DRV_VERSION "0.2.3" struct pata_acpi { struct ata_acpi_gtm gtm; void *last; unsigned long mask[2]; }; /** * pacpi_pre_reset - check for 40/80 pin * @ap: Port * @deadline: deadline jiffies for the operation * * Perform the PATA port setup we need. */ static int pacpi_pre_reset(struct ata_link *link, unsigned long deadline) { struct ata_port *ap = link->ap; struct pata_acpi *acpi = ap->private_data; if (ap->acpi_handle == NULL || ata_acpi_gtm(ap, &acpi->gtm) < 0) return -ENODEV; return ata_sff_prereset(link, deadline); } /** * pacpi_cable_detect - cable type detection * @ap: port to detect * * Perform device specific cable detection */ static int pacpi_cable_detect(struct ata_port *ap) { struct pata_acpi *acpi = ap->private_data; if ((acpi->mask[0] | acpi->mask[1]) & (0xF8 << ATA_SHIFT_UDMA)) return ATA_CBL_PATA80; else return ATA_CBL_PATA40; } /** * pacpi_discover_modes - filter non ACPI modes * @adev: ATA device * @mask: proposed modes * * Try the modes available and see which ones the ACPI method will * set up sensibly. From this we get a mask of ACPI modes we can use */ static unsigned long pacpi_discover_modes(struct ata_port *ap, struct ata_device *adev) { struct pata_acpi *acpi = ap->private_data; struct ata_acpi_gtm probe; unsigned int xfer_mask; probe = acpi->gtm; ata_acpi_gtm(ap, &probe); xfer_mask = ata_acpi_gtm_xfermask(adev, &probe); if (xfer_mask & (0xF8 << ATA_SHIFT_UDMA)) ap->cbl = ATA_CBL_PATA80; return xfer_mask; } /** * pacpi_mode_filter - mode filter for ACPI * @adev: device * @mask: mask of valid modes * * Filter the valid mode list according to our own specific rules, in * this case the list of discovered valid modes obtained by ACPI probing */ static unsigned long pacpi_mode_filter(struct ata_device *adev, unsigned long mask) { struct pata_acpi *acpi = adev->link->ap->private_data; return ata_bmdma_mode_filter(adev, mask & acpi->mask[adev->devno]); } /** * pacpi_set_piomode - set initial PIO mode data * @ap: ATA interface * @adev: ATA device */ static void pacpi_set_piomode(struct ata_port *ap, struct ata_device *adev) { int unit = adev->devno; struct pata_acpi *acpi = ap->private_data; const struct ata_timing *t; if (!(acpi->gtm.flags & 0x10)) unit = 0; /* Now stuff the nS values into the structure */ t = ata_timing_find_mode(adev->pio_mode); acpi->gtm.drive[unit].pio = t->cycle; ata_acpi_stm(ap, &acpi->gtm); /* See what mode we actually got */ ata_acpi_gtm(ap, &acpi->gtm); } /** * pacpi_set_dmamode - set initial DMA mode data * @ap: ATA interface * @adev: ATA device */ static void pacpi_set_dmamode(struct ata_port *ap, struct ata_device *adev) { int unit = adev->devno; struct pata_acpi *acpi = ap->private_data; const struct ata_timing *t; if (!(acpi->gtm.flags & 0x10)) unit = 0; /* Now stuff the nS values into the structure */ t = ata_timing_find_mode(adev->dma_mode); if (adev->dma_mode >= XFER_UDMA_0) { acpi->gtm.drive[unit].dma = t->udma; acpi->gtm.flags |= (1 << (2 * unit)); } else { acpi->gtm.drive[unit].dma = t->cycle; acpi->gtm.flags &= ~(1 << (2 * unit)); } ata_acpi_stm(ap, &acpi->gtm); /* See what mode we actually got */ ata_acpi_gtm(ap, &acpi->gtm); } /** * pacpi_qc_issue - command issue * @qc: command pending * * Called when the libata layer is about to issue a command. We wrap * this interface so that we can load the correct ATA timings if * neccessary. */ static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; struct ata_device *adev = qc->dev; struct pata_acpi *acpi = ap->private_data; if (acpi->gtm.flags & 0x10) return ata_sff_qc_issue(qc); if (adev != acpi->last) { pacpi_set_piomode(ap, adev); if (ata_dma_enabled(adev)) pacpi_set_dmamode(ap, adev); acpi->last = adev; } return ata_sff_qc_issue(qc); } /** * pacpi_port_start - port setup * @ap: ATA port being set up * * Use the port_start hook to maintain private control structures */ static int pacpi_port_start(struct ata_port *ap) { struct pci_dev *pdev = to_pci_dev(ap->host->dev); struct pata_acpi *acpi; int ret; if (ap->acpi_handle == NULL) return -ENODEV; acpi = ap->private_data = devm_kzalloc(&pdev->dev, sizeof(struct pata_acpi), GFP_KERNEL); if (ap->private_data == NULL) return -ENOMEM; acpi->mask[0] = pacpi_discover_modes(ap, &ap->link.device[0]); acpi->mask[1] = pacpi_discover_modes(ap, &ap->link.device[1]); ret = ata_sff_port_start(ap); if (ret < 0) return ret; return ret; } static struct scsi_host_template pacpi_sht = { ATA_BMDMA_SHT(DRV_NAME), }; static struct ata_port_operations pacpi_ops = { .inherits = &ata_bmdma_port_ops, .qc_issue = pacpi_qc_issue, .cable_detect = pacpi_cable_detect, .mode_filter = pacpi_mode_filter, .set_piomode = pacpi_set_piomode, .set_dmamode = pacpi_set_dmamode, .prereset = pacpi_pre_reset, .port_start = pacpi_port_start, }; /** * pacpi_init_one - Register ACPI ATA PCI device with kernel services * @pdev: PCI device to register * @ent: Entry in pacpi_pci_tbl matching with @pdev * * Called from kernel PCI layer. * * LOCKING: * Inherited from PCI layer (may sleep). * * RETURNS: * Zero on success, or -ERRNO value. */ static int pacpi_init_one (struct pci_dev *pdev, const struct pci_device_id *id) { static const struct ata_port_info info = { .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, .pio_mask = ATA_PIO4, .mwdma_mask = ATA_MWDMA2, .udma_mask = ATA_UDMA6, .port_ops = &pacpi_ops, }; const struct ata_port_info *ppi[] = { &info, NULL }; if (pdev->vendor == PCI_VENDOR_ID_ATI) { int rc = pcim_enable_device(pdev); if (rc < 0) return rc; pcim_pin_device(pdev); } return ata_pci_sff_init_one(pdev, ppi, &pacpi_sht, NULL); } static const struct pci_device_id pacpi_pci_tbl[] = { { PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID, PCI_CLASS_STORAGE_IDE << 8, 0xFFFFFF00UL, 1}, { } /* terminate list */ }; static struct pci_driver pacpi_pci_driver = { .name = DRV_NAME, .id_table = pacpi_pci_tbl, .probe = pacpi_init_one, .remove = ata_pci_remove_one, #ifdef CONFIG_PM .suspend = ata_pci_device_suspend, .resume = ata_pci_device_resume, #endif }; static int __init pacpi_init(void) { return pci_register_driver(&pacpi_pci_driver); } static void __exit pacpi_exit(void) { pci_unregister_driver(&pacpi_pci_driver); } module_init(pacpi_init); module_exit(pacpi_exit); MODULE_AUTHOR("Alan Cox"); MODULE_DESCRIPTION("SCSI low-level driver for ATA in ACPI mode"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pci, pacpi_pci_tbl); MODULE_VERSION(DRV_VERSION);