From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/ata/pata_acpi.c | 280 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 280 insertions(+) create mode 100644 drivers/ata/pata_acpi.c (limited to 'drivers/ata/pata_acpi.c') diff --git a/drivers/ata/pata_acpi.c b/drivers/ata/pata_acpi.c new file mode 100644 index 000000000..b70fce2a3 --- /dev/null +++ b/drivers/ata/pata_acpi.c @@ -0,0 +1,280 @@ +/* + * ACPI PATA driver + * + * (c) 2007 Red Hat + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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 (ACPI_HANDLE(&ap->tdev) == 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 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 + * necessary. + */ + +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_bmdma_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_bmdma_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; + + if (ACPI_HANDLE(&ap->tdev) == 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]); + return ata_bmdma_port_start(ap); +} + +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, + + .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_bmdma_init_one(pdev, ppi, &pacpi_sht, NULL, 0); +} + +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_SLEEP + .suspend = ata_pci_device_suspend, + .resume = ata_pci_device_resume, +#endif +}; + +module_pci_driver(pacpi_pci_driver); + +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); -- cgit v1.2.3-54-g00ecf