diff options
Diffstat (limited to 'drivers/ata/pata_acpi.c')
| -rw-r--r-- | drivers/ata/pata_acpi.c | 395 |
1 files changed, 395 insertions, 0 deletions
diff --git a/drivers/ata/pata_acpi.c b/drivers/ata/pata_acpi.c new file mode 100644 index 0000000..5d3920f --- /dev/null +++ b/drivers/ata/pata_acpi.c @@ -0,0 +1,395 @@ +/* + * 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) +{ + return ata_bmdma_drive_eh(ap, pacpi_pre_reset, ata_std_softreset, + NULL, ata_std_postreset); +} + +/* Welcome to ACPI, bring a bucket */ +static const unsigned int pio_cycle[7] = { + 600, 383, 240, 180, 120, 100, 80 +}; +static const unsigned int mwdma_cycle[5] = { + 480, 150, 120, 100, 80 +}; +static const unsigned int udma_cycle[7] = { + 120, 80, 60, 45, 30, 20, 15 +}; + +/** + * 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) +{ + int unit = adev->devno; + struct pata_acpi *acpi = ap->private_data; + int i; + u32 t; + unsigned long mask = (0x7f << ATA_SHIFT_UDMA) | (0x7 << ATA_SHIFT_MWDMA) | (0x1F << ATA_SHIFT_PIO); + + struct ata_acpi_gtm probe; + + probe = acpi->gtm; + + /* We always use the 0 slot for crap hardware */ + if (!(probe.flags & 0x10)) + unit = 0; + + ata_acpi_gtm(ap, &probe); + + /* Start by scanning for PIO modes */ + for (i = 0; i < 7; i++) { + t = probe.drive[unit].pio; + if (t <= pio_cycle[i]) { + mask |= (2 << (ATA_SHIFT_PIO + i)) - 1; + break; + } + } + + /* See if we have MWDMA or UDMA data. We don't bother with MWDMA + if UDMA is availabe as this means the BIOS set UDMA and our + error changedown if it works is UDMA to PIO anyway */ + if (probe.flags & (1 << (2 * unit))) { + /* MWDMA */ + for (i = 0; i < 5; i++) { + t = probe.drive[unit].dma; + if (t <= mwdma_cycle[i]) { + mask |= (2 << (ATA_SHIFT_MWDMA + i)) - 1; + break; + } + } + } else { + /* UDMA */ + for (i = 0; i < 7; i++) { + t = probe.drive[unit].dma; + if (t <= udma_cycle[i]) { + mask |= (2 << (ATA_SHIFT_UDMA + i)) - 1; + break; + } + } + } + if (mask & (0xF8 << ATA_SHIFT_UDMA)) + ap->cbl = ATA_CBL_PATA80; + return 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; + + if(!(acpi->gtm.flags & 0x10)) + unit = 0; + + /* Now stuff the nS values into the structure */ + acpi->gtm.drive[unit].pio = pio_cycle[adev->pio_mode - XFER_PIO_0]; + 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; + + if(!(acpi->gtm.flags & 0x10)) + unit = 0; + + /* Now stuff the nS values into the structure */ + if (adev->dma_mode >= XFER_UDMA_0) { + acpi->gtm.drive[unit].dma = udma_cycle[adev->dma_mode - XFER_UDMA_0]; + acpi->gtm.flags |= (1 << (2 * unit)); + } else { + acpi->gtm.drive[unit].dma = mwdma_cycle[adev->dma_mode - XFER_MW_DMA_0]; + 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 = { + .module = THIS_MODULE, + .name = DRV_NAME, + .ioctl = ata_scsi_ioctl, + .queuecommand = ata_scsi_queuecmd, + .can_queue = ATA_DEF_QUEUE, + .this_id = ATA_SHT_THIS_ID, + .sg_tablesize = LIBATA_MAX_PRD, + .cmd_per_lun = ATA_SHT_CMD_PER_LUN, + .emulated = ATA_SHT_EMULATED, + .use_clustering = ATA_SHT_USE_CLUSTERING, + .proc_name = DRV_NAME, + .dma_boundary = ATA_DMA_BOUNDARY, + .slave_configure = ata_scsi_slave_config, + .slave_destroy = ata_scsi_slave_destroy, + /* Use standard CHS mapping rules */ + .bios_param = ata_std_bios_param, +}; + +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, + .suspend = ata_pci_device_suspend, + .resume = ata_pci_device_resume, +}; + +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); + |
