| /* |
| * ACPI PATA driver |
| * |
| * (c) 2007 Red Hat <alan@redhat.com> |
| */ |
| |
| #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 <acpi/acnames.h> |
| #include <acpi/acnamesp.h> |
| #include <acpi/acparser.h> |
| #include <acpi/acexcep.h> |
| #include <acpi/acmacros.h> |
| #include <acpi/actypes.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_std_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_error_handler - Setup and error handler |
| * @ap: Port to handle |
| * |
| * LOCKING: |
| * None (inherited from caller). |
| */ |
| |
| static void pacpi_error_handler(struct ata_port *ap) |
| { |
| ata_bmdma_drive_eh(ap, pacpi_pre_reset, ata_std_softreset, NULL, |
| ata_std_postreset); |
| } |
| |
| /** |
| * 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_pci_default_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_prot - 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_prot(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_qc_issue_prot(qc); |
| |
| if (adev != acpi->last) { |
| pacpi_set_piomode(ap, adev); |
| if (adev->dma_mode) |
| pacpi_set_dmamode(ap, adev); |
| acpi->last = adev; |
| } |
| return ata_qc_issue_prot(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 const struct ata_port_operations pacpi_ops = { |
| .set_piomode = pacpi_set_piomode, |
| .set_dmamode = pacpi_set_dmamode, |
| .mode_filter = pacpi_mode_filter, |
| |
| /* Task file is PCI ATA format, use helpers */ |
| .tf_load = ata_tf_load, |
| .tf_read = ata_tf_read, |
| .check_status = ata_check_status, |
| .exec_command = ata_exec_command, |
| .dev_select = ata_std_dev_select, |
| |
| .freeze = ata_bmdma_freeze, |
| .thaw = ata_bmdma_thaw, |
| .error_handler = pacpi_error_handler, |
| .post_internal_cmd = ata_bmdma_post_internal_cmd, |
| .cable_detect = pacpi_cable_detect, |
| |
| /* BMDMA handling is PCI ATA format, use helpers */ |
| .bmdma_setup = ata_bmdma_setup, |
| .bmdma_start = ata_bmdma_start, |
| .bmdma_stop = ata_bmdma_stop, |
| .bmdma_status = ata_bmdma_status, |
| .qc_prep = ata_qc_prep, |
| .qc_issue = pacpi_qc_issue_prot, |
| .data_xfer = ata_data_xfer, |
| |
| /* Timeout handling */ |
| .irq_handler = ata_interrupt, |
| .irq_clear = ata_bmdma_irq_clear, |
| .irq_on = ata_irq_on, |
| |
| /* Generic PATA PCI ATA helpers */ |
| .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 = { |
| .sht = &pacpi_sht, |
| .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, |
| |
| .pio_mask = 0x1f, |
| .mwdma_mask = 0x07, |
| .udma_mask = 0x7f, |
| |
| .port_ops = &pacpi_ops, |
| }; |
| const struct ata_port_info *ppi[] = { &info, NULL }; |
| return ata_pci_init_one(pdev, ppi); |
| } |
| |
| 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); |
| |