Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757315AbZGMVDZ (ORCPT ); Mon, 13 Jul 2009 17:03:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757281AbZGMVDV (ORCPT ); Mon, 13 Jul 2009 17:03:21 -0400 Received: from cavan.codon.org.uk ([93.93.128.6]:57347 "EHLO cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756931AbZGMVDR (ORCPT ); Mon, 13 Jul 2009 17:03:17 -0400 From: Matthew Garrett To: linux-kernel@vger.kernel.org Cc: linux-acpi@vger.kernel.org, linux-scsi@vger.kernel.org, James.Bottomley@HansenPartnership.com, shaohua.li@intel.com, linux-ide@vger.kernel.org, Matthew Garrett Subject: [PATCH 2/3] libata: Bind the Linux device tree to the ACPI device tree Date: Mon, 13 Jul 2009 22:03:06 +0100 Message-Id: <1247518987-10818-2-git-send-email-mjg@redhat.com> X-Mailer: git-send-email 1.6.2.5 In-Reply-To: <1247518987-10818-1-git-send-email-mjg@redhat.com> References: <1247518987-10818-1-git-send-email-mjg@redhat.com> X-SA-Do-Not-Run: Yes X-SA-Exim-Connect-IP: 78.86.230.144 X-SA-Exim-Mail-From: mjg@redhat.com X-SA-Exim-Scanned: No (on cavan.codon.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4318 Lines: 164 We want to be able to express the dependencies between ACPI dock devices and their children. This requires us to be able to associate the ACPI device tree and libata devices. This patch uses the generic ACPI glue framework to do so. Signed-off-by: Matthew Garrett --- drivers/ata/Kconfig | 1 + drivers/ata/libata-acpi.c | 118 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 119 insertions(+), 0 deletions(-) diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig index b17c57f..2e192bf 100644 --- a/drivers/ata/Kconfig +++ b/drivers/ata/Kconfig @@ -30,6 +30,7 @@ config ATA_ACPI bool "ATA ACPI Support" depends on ACPI && PCI select ACPI_DOCK + select SCSI_PLATFORM default y help This option adds support for ATA-related ACPI objects. diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c index ac176da..2d12a2c 100644 --- a/drivers/ata/libata-acpi.c +++ b/drivers/ata/libata-acpi.c @@ -56,6 +56,31 @@ static void ata_acpi_clear_gtf(struct ata_device *dev) dev->gtf_cache = NULL; } +static acpi_handle ap_acpi_handle(struct ata_port *ap) +{ + if (ap->flags & ATA_FLAG_ACPI_SATA) + return NULL; + return DEVICE_ACPI_HANDLE(&ap->scsi_host->shost_gendev); +} + +static acpi_handle dev_acpi_handle(struct ata_device *dev) +{ + acpi_integer adr; + struct ata_port *ap = dev->link->ap; + + if (dev->sdev) + return DEVICE_ACPI_HANDLE(&dev->sdev->sdev_gendev); + + if (ap->flags & ATA_FLAG_ACPI_SATA) { + if (!sata_pmp_attached(ap)) + adr = SATA_ADR(ap->port_no, NO_PORT_MULT); + else + adr = SATA_ADR(ap->port_no, dev->link->pmp); + return acpi_get_child(DEVICE_ACPI_HANDLE(ap->host->dev), adr); + } else + return acpi_get_child(ap_acpi_handle(ap), dev->devno); +} + /** * ata_acpi_associate_sata_port - associate SATA port with ACPI objects * @ap: target SATA port @@ -1026,3 +1051,96 @@ void ata_acpi_on_disable(struct ata_device *dev) { ata_acpi_clear_gtf(dev); } + +static int is_pci_ata(struct device *dev) +{ + struct pci_dev *pdev; + + if (!is_pci_dev(dev)) + return 0; + + pdev = to_pci_dev(dev); + + if ((pdev->class >> 8) != PCI_CLASS_STORAGE_SATA && + (pdev->class >> 8) != PCI_CLASS_STORAGE_IDE) + return 0; + + return 1; +} + +static int ata_acpi_bind_host(struct device *dev, int host, acpi_handle *handle) +{ + struct Scsi_Host *shost = dev_to_shost(dev); + struct ata_port *ap = ata_shost_to_port(shost); + + if (ap->flags & ATA_FLAG_ACPI_SATA) + return -ENODEV; + + *handle = acpi_get_child(DEVICE_ACPI_HANDLE(dev->parent), ap->port_no); + + if (!*handle) + return -ENODEV; + + return 0; +} + +static int ata_acpi_bind_device(struct device *dev, int channel, int id, + acpi_handle *handle) +{ + struct device *host = dev->parent->parent; + struct Scsi_Host *shost = dev_to_shost(host); + struct ata_port *ap = ata_shost_to_port(shost); + struct ata_device *ata_dev; + + if (ap->flags & ATA_FLAG_ACPI_SATA) + ata_dev = &ap->link.device[channel]; + else + ata_dev = &ap->link.device[id]; + + *handle = dev_acpi_handle(ata_dev); + + if (!*handle) + return -ENODEV; + + return 0; +} + +static int ata_acpi_find_device(struct device *dev, acpi_handle *handle) +{ + unsigned int host, channel, id, lun; + + if (sscanf(dev_name(dev), "host%u", &host) == 1) { + if (!is_pci_ata(dev->parent)) + return -ENODEV; + + return ata_acpi_bind_host(dev, host, handle); + } else if (sscanf(dev_name(dev), "%d:%d:%d:%d", + &host, &channel, &id, &lun) == 4) { + if (!is_pci_ata(dev->parent->parent->parent)) + return -ENODEV; + + return ata_acpi_bind_device(dev, channel, id, handle); + } else + return -ENODEV; +} + +static int ata_acpi_find_dummy(struct device *dev, acpi_handle *handle) +{ + return -ENODEV; +} + +static struct acpi_bus_type ata_acpi_bus = { + .bus = &scsi_bus_type, + .find_bridge = ata_acpi_find_dummy, + .find_device = ata_acpi_find_device, +}; + +int scsi_platform_register(void) +{ + return register_acpi_bus_type(&ata_acpi_bus); +} + +void scsi_platform_unregister(void) +{ + unregister_acpi_bus_type(&ata_acpi_bus); +} -- 1.6.2.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/