3 files changed, 406 insertions, 0 deletions

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index cf960bd1c00a..4672066167e3 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -173,6 +173,15 @@ config SATA_INIC162X
         help
           This option enables support for Initio 162x Serial ATA.
 
+config PATA_ACPI
+        tristate "ACPI firmware driver for PATA"
+        depends on ATA_ACPI
+        help
+          This option enables an ACPI method driver which drives
+          motherboard PATA controller interfaces through the ACPI
+          firmware in the BIOS. This driver can sometimes handle
+          otherwise unsupported hardware.
+
 config PATA_ALI
         tristate "ALi PATA support (Experimental)"
         depends on PCI && EXPERIMENTAL
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 7e937519a930..2a63645003eb 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -66,6 +66,8 @@ obj-$(CONFIG_PATA_SCC)		+= pata_scc.o
 obj-$(CONFIG_PATA_BF54X)        += pata_bf54x.o
 obj-$(CONFIG_PATA_PLATFORM)     += pata_platform.o
 obj-$(CONFIG_PATA_ICSIDE)       += pata_icside.o
+# Should be last but two libata driver
+obj-$(CONFIG_PATA_ACPI)         += pata_acpi.o
 # Should be last but one libata driver
 obj-$(CONFIG_ATA_GENERIC)       += ata_generic.o
 # Should be last libata driver
diff --git a/drivers/ata/pata_acpi.c b/drivers/ata/pata_acpi.c
new file mode 100644
index 000000000000..5d3920f6fd69
--- /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);
+