libata/IDE: remove combined mode quirk

Both old-IDE and libata should be able handle all controllers and
devices found using normal resource reservation methods.

This eliminates the awful, low-performing split-driver configuration
where old-IDE drove the PATA portion of a PCI device, in PIO-only mode,
and libata drove the SATA portion of the /same/ PCI device, in DMA mode.
Typically vendors would ship SATA hard drive / PATA optical
configuration, which would lend itself to slow (PIO-only) CD-ROM
performance.

For Intel users running in combined mode, it is now wholly dependent on
your driver choice (potentially link order, if you compile both drivers
in) whether old-IDE or libata will drive your hardware.

In either case, you will get full performance from both SATA and PATA
ports now, without having to pass a kernel command line parameter.

Signed-off-by: Jeff Garzik <jeff@garzik.org>

3 files changed, 6 insertions, 148 deletions

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index c679bba4789b..365c306c7cf8 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -156,11 +156,6 @@ config SATA_INIC162X
         help
           This option enables support for Initio 162x Serial ATA.
 
-config SATA_INTEL_COMBINED
-        bool
-        depends on IDE=y && !BLK_DEV_IDE_SATA && (SATA_AHCI || ATA_PIIX)
-        default y
-
 config SATA_ACPI
         bool
         depends on ACPI && PCI
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 066689c5e509..0a194660fd21 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -779,40 +779,16 @@ int ata_pci_init_one (struct pci_dev *pdev, struct ata_port_info **port_info,
                 /* Deal with combined mode hack. This side of the logic all
                    goes away once the combined mode hack is killed in 2.6.21 */
                 if (!devm_request_region(dev, ATA_PRIMARY_CMD, 8, "libata")) {
-                        struct resource *conflict, res;
-                        res.start = ATA_PRIMARY_CMD;
-                        res.end = ATA_PRIMARY_CMD + 8 - 1;
-                        conflict = ____request_resource(&ioport_resource, &res);
-                        while (conflict->child)
-                                conflict = ____request_resource(conflict, &res);
-                        if (!strcmp(conflict->name, "libata"))
-                                legacy_mode |= ATA_PORT_PRIMARY;
-                        else {
-                                pcim_pin_device(pdev);
-                                printk(KERN_WARNING "ata: 0x%0X IDE port busy\n" \
-                                                    "ata: conflict with %s\n",
-                                                    ATA_PRIMARY_CMD,
-                                                    conflict->name);
-                        }
+                        pcim_pin_device(pdev);
+                        printk(KERN_WARNING "ata: 0x%0X IDE port busy\n",
+                                            ATA_PRIMARY_CMD);
                 } else
                         legacy_mode |= ATA_PORT_PRIMARY;
 
                 if (!devm_request_region(dev, ATA_SECONDARY_CMD, 8, "libata")) {
-                        struct resource *conflict, res;
-                        res.start = ATA_SECONDARY_CMD;
-                        res.end = ATA_SECONDARY_CMD + 8 - 1;
-                        conflict = ____request_resource(&ioport_resource, &res);
-                        while (conflict->child)
-                                conflict = ____request_resource(conflict, &res);
-                        if (!strcmp(conflict->name, "libata"))
-                                legacy_mode |= ATA_PORT_SECONDARY;
-                        else {
-                                pcim_pin_device(pdev);
-                                printk(KERN_WARNING "ata: 0x%X IDE port busy\n" \
-                                                    "ata: conflict with %s\n",
-                                                    ATA_SECONDARY_CMD,
-                                                    conflict->name);
-                        }
+                        pcim_pin_device(pdev);
+                        printk(KERN_WARNING "ata: 0x%X IDE port busy\n",
+                                            ATA_SECONDARY_CMD);
                 } else
                         legacy_mode |= ATA_PORT_SECONDARY;
 
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 65d6f23ead41..3411483240cd 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -1303,119 +1303,6 @@ static void __init quirk_alder_ioapic(struct pci_dev *pdev)
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL,   PCI_DEVICE_ID_INTEL_EESSC,      quirk_alder_ioapic );
 #endif
 
-enum ide_combined_type { COMBINED = 0, IDE = 1, LIBATA = 2 };
-/* Defaults to combined */
-static enum ide_combined_type combined_mode;
-
-static int __init combined_setup(char *str)
-{
-        if (!strncmp(str, "ide", 3))
-                combined_mode = IDE;
-        else if (!strncmp(str, "libata", 6))
-                combined_mode = LIBATA;
-        else /* "combined" or anything else defaults to old behavior */
-                combined_mode = COMBINED;
-
-        return 1;
-}
-__setup("combined_mode=", combined_setup);
-
-#ifdef CONFIG_SATA_INTEL_COMBINED
-static void __devinit quirk_intel_ide_combined(struct pci_dev *pdev)
-{
-        u8 prog, comb, tmp;
-        int ich = 0;
-
-        /*
-         * Narrow down to Intel SATA PCI devices.
-         */
-        switch (pdev->device) {
-        /* PCI ids taken from drivers/scsi/ata_piix.c */
-        case 0x24d1:
-        case 0x24df:
-        case 0x25a3:
-        case 0x25b0:
-                ich = 5;
-                break;
-        case 0x2651:
-        case 0x2652:
-        case 0x2653:
-        case 0x2680:    /* ESB2 */
-                ich = 6;
-                break;
-        case 0x27c0:
-        case 0x27c4:
-                ich = 7;
-                break;
-        case 0x2828:    /* ICH8M */
-                ich = 8;
-                break;
-        default:
-                /* we do not handle this PCI device */
-                return;
-        }
-
-        /*
-         * Read combined mode register.
-         */
-        pci_read_config_byte(pdev, 0x90, &tmp); /* combined mode reg */
-
-        if (ich == 5) {
-                tmp &= 0x6;  /* interesting bits 2:1, PATA primary/secondary */
-                if (tmp == 0x4)         /* bits 10x */
-                        comb = (1 << 0);        /* SATA port 0, PATA port 1 */
-                else if (tmp == 0x6)    /* bits 11x */
-                        comb = (1 << 2);        /* PATA port 0, SATA port 1 */
-                else
-                        return;                 /* not in combined mode */
-        } else {
-                WARN_ON((ich != 6) && (ich != 7) && (ich != 8));
-                tmp &= 0x3;  /* interesting bits 1:0 */
-                if (tmp & (1 << 0))
-                        comb = (1 << 2);        /* PATA port 0, SATA port 1 */
-                else if (tmp & (1 << 1))
-                        comb = (1 << 0);        /* SATA port 0, PATA port 1 */
-                else
-                        return;                 /* not in combined mode */
-        }
-
-        /*
-         * Read programming interface register.
-         * (Tells us if it's legacy or native mode)
-         */
-        pci_read_config_byte(pdev, PCI_CLASS_PROG, &prog);
-
-        /* if SATA port is in native mode, we're ok. */
-        if (prog & comb)
-                return;
-
-        /* Don't reserve any so the IDE driver can get them (but only if
-         * combined_mode=ide).
-         */
-        if (combined_mode == IDE)
-                return;
-
-        /* Grab them both for libata if combined_mode=libata. */
-        if (combined_mode == LIBATA) {
-                request_region(0x1f0, 8, "libata");     /* port 0 */
-                request_region(0x170, 8, "libata");     /* port 1 */
-                return;
-        }
-
-        /* SATA port is in legacy mode.  Reserve port so that
-         * IDE driver does not attempt to use it.  If request_region
-         * fails, it will be obvious at boot time, so we don't bother
-         * checking return values.
-         */
-        if (comb == (1 << 0))
-                request_region(0x1f0, 8, "libata");     /* port 0 */
-        else
-                request_region(0x170, 8, "libata");     /* port 1 */
-}
-DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,    PCI_ANY_ID,       quirk_intel_ide_combined );
-#endif /* CONFIG_SATA_INTEL_COMBINED */
-
-
 int pcie_mch_quirk;
 EXPORT_SYMBOL(pcie_mch_quirk);