patch-2.4.21 linux-2.4.21/drivers/ide/setup-pci.c

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diff -urN linux-2.4.20/drivers/ide/setup-pci.c linux-2.4.21/drivers/ide/setup-pci.c
@@ -0,0 +1,832 @@
+/*
+ *  linux/drivers/ide/setup-pci.c		Version 1.10	2002/08/19
+ *
+ *  Copyright (c) 1998-2000  Andre Hedrick <andre@linux-ide.org>
+ *
+ *  Copyright (c) 1995-1998  Mark Lord
+ *  May be copied or modified under the terms of the GNU General Public License
+ *
+ *  Recent Changes
+ *	Split the set up function into multiple functions
+ *	Use pci_set_master
+ *	Fix misreporting of I/O v MMIO problems
+ *	Initial fixups for simplex devices
+ */
+
+/*
+ *  This module provides support for automatic detection and
+ *  configuration of all PCI IDE interfaces present in a system.  
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/ide.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+
+
+/**
+ *	ide_match_hwif	-	match a PCI IDE against an ide_hwif
+ *	@io_base: I/O base of device
+ *	@bootable: set if its bootable
+ *	@name: name of device
+ *
+ *	Match a PCI IDE port against an entry in ide_hwifs[],
+ *	based on io_base port if possible. Return the matching hwif,
+ *	or a new hwif. If we find an error (clashing, out of devices, etc)
+ *	return NULL
+ *
+ *	FIXME: we need to handle mmio matches here too
+ */
+
+static ide_hwif_t *ide_match_hwif(unsigned long io_base, u8 bootable, const char *name)
+{
+	int h;
+	ide_hwif_t *hwif;
+
+	/*
+	 * Look for a hwif with matching io_base specified using
+	 * parameters to ide_setup().
+	 */
+	for (h = 0; h < MAX_HWIFS; ++h) {
+		hwif = &ide_hwifs[h];
+		if (hwif->io_ports[IDE_DATA_OFFSET] == io_base) {
+			if (hwif->chipset == ide_generic)
+				return hwif; /* a perfect match */
+		}
+	}
+	/*
+	 * Look for a hwif with matching io_base default value.
+	 * If chipset is "ide_unknown", then claim that hwif slot.
+	 * Otherwise, some other chipset has already claimed it..  :(
+	 */
+	for (h = 0; h < MAX_HWIFS; ++h) {
+		hwif = &ide_hwifs[h];
+		if (hwif->io_ports[IDE_DATA_OFFSET] == io_base) {
+			if (hwif->chipset == ide_unknown)
+				return hwif; /* match */
+			printk(KERN_ERR "%s: port 0x%04lx already claimed by %s\n",
+				name, io_base, hwif->name);
+			return NULL;	/* already claimed */
+		}
+	}
+	/*
+	 * Okay, there is no hwif matching our io_base,
+	 * so we'll just claim an unassigned slot.
+	 * Give preference to claiming other slots before claiming ide0/ide1,
+	 * just in case there's another interface yet-to-be-scanned
+	 * which uses ports 1f0/170 (the ide0/ide1 defaults).
+	 *
+	 * Unless there is a bootable card that does not use the standard
+	 * ports 1f0/170 (the ide0/ide1 defaults). The (bootable) flag.
+	 */
+	if (bootable) {
+		for (h = 0; h < MAX_HWIFS; ++h) {
+			hwif = &ide_hwifs[h];
+			if (hwif->chipset == ide_unknown)
+				return hwif;	/* pick an unused entry */
+		}
+	} else {
+		for (h = 2; h < MAX_HWIFS; ++h) {
+			hwif = ide_hwifs + h;
+			if (hwif->chipset == ide_unknown)
+				return hwif;	/* pick an unused entry */
+		}
+	}
+	for (h = 0; h < 2; ++h) {
+		hwif = ide_hwifs + h;
+		if (hwif->chipset == ide_unknown)
+			return hwif;	/* pick an unused entry */
+	}
+	printk(KERN_ERR "%s: too many IDE interfaces, no room in table\n", name);
+	return NULL;
+}
+
+/**
+ *	ide_setup_pci_baseregs	-	place a PCI IDE controller native
+ *	@dev: PCI device of interface to switch native
+ *	@name: Name of interface
+ *
+ *	We attempt to place the PCI interface into PCI native mode. If
+ *	we succeed the BARs are ok and the controller is in PCI mode.
+ *	Returns 0 on success or an errno code. 
+ *
+ *	FIXME: if we program the interface and then fail to set the BARS
+ *	we don't switch it back to legacy mode. Do we actually care ??
+ */
+ 
+static int ide_setup_pci_baseregs (struct pci_dev *dev, const char *name)
+{
+	u8 progif = 0;
+
+	/*
+	 * Place both IDE interfaces into PCI "native" mode:
+	 */
+	if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
+			 (progif & 5) != 5) {
+		if ((progif & 0xa) != 0xa) {
+			printk(KERN_INFO "%s: device not capable of full "
+				"native PCI mode\n", name);
+			return -EOPNOTSUPP;
+		}
+		printk("%s: placing both ports into native PCI mode\n", name);
+		(void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5);
+		if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
+		    (progif & 5) != 5) {
+			printk(KERN_ERR "%s: rewrite of PROGIF failed, wanted "
+				"0x%04x, got 0x%04x\n",
+				name, progif|5, progif);
+			return -EOPNOTSUPP;
+		}
+	}
+	return 0;
+}
+
+#ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
+/*
+ * Long lost data from 2.0.34 that is now in 2.0.39
+ *
+ * This was used in ./drivers/block/triton.c to do DMA Base address setup
+ * when PnP failed.  Oh the things we forget.  I believe this was part
+ * of SFF-8038i that has been withdrawn from public access... :-((
+ */
+#define DEFAULT_BMIBA	0xe800	/* in case BIOS did not init it */
+#define DEFAULT_BMCRBA	0xcc00	/* VIA's default value */
+#define DEFAULT_BMALIBA	0xd400	/* ALI's default value */
+#endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */
+
+/**
+ *	ide_get_or_set_dma_base		-	setup BMIBA
+ *	@hwif: Interface
+ *
+ *	Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space:
+ *	If need be we set up the DMA base. Where a device has a partner that
+ *	is already in DMA mode we check and enforce IDE simplex rules.
+ */
+
+static unsigned long __init ide_get_or_set_dma_base (ide_hwif_t *hwif)
+{
+	unsigned long	dma_base = 0;
+	struct pci_dev	*dev = hwif->pci_dev;
+
+#ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
+	int second_chance = 0;
+
+second_chance_to_dma:
+#endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */
+
+	if ((hwif->mmio) && (hwif->dma_base))
+		return hwif->dma_base;
+
+	if (hwif->mate && hwif->mate->dma_base) {
+		dma_base = hwif->mate->dma_base - (hwif->channel ? 0 : 8);
+	} else {
+		dma_base = (hwif->mmio) ?
+			((unsigned long) hwif->hwif_data) :
+			(pci_resource_start(dev, 4));
+		if (!dma_base) {
+			printk(KERN_ERR "%s: dma_base is invalid (0x%04lx)\n",
+				hwif->cds->name, dma_base);
+			dma_base = 0;
+		}
+	}
+
+#ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
+	/* FIXME - should use pci_assign_resource surely */
+	if ((!dma_base) && (!second_chance)) {
+		unsigned long set_bmiba = 0;
+		second_chance++;
+		switch(dev->vendor) {
+			case PCI_VENDOR_ID_AL:
+				set_bmiba = DEFAULT_BMALIBA; break;
+			case PCI_VENDOR_ID_VIA:
+				set_bmiba = DEFAULT_BMCRBA; break;
+			case PCI_VENDOR_ID_INTEL:
+				set_bmiba = DEFAULT_BMIBA; break;
+			default:
+				return dma_base;
+		}
+		pci_write_config_dword(dev, 0x20, set_bmiba|1);
+		goto second_chance_to_dma;
+	}
+#endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */
+
+	if (dma_base) {
+		u8 simplex_stat = 0;
+		dma_base += hwif->channel ? 8 : 0;
+
+		switch(dev->device) {
+			case PCI_DEVICE_ID_AL_M5219:
+			case PCI_DEVICE_ID_AL_M5229:
+			case PCI_DEVICE_ID_AMD_VIPER_7409:
+			case PCI_DEVICE_ID_CMD_643:
+			case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
+				simplex_stat = hwif->INB(dma_base + 2);
+				hwif->OUTB((simplex_stat&0x60),(dma_base + 2));
+				simplex_stat = hwif->INB(dma_base + 2);
+				if (simplex_stat & 0x80) {
+					printk(KERN_INFO "%s: simplex device: "
+						"DMA forced\n",
+						hwif->cds->name);
+				}
+				break;
+			default:
+				/*
+				 * If the device claims "simplex" DMA,
+				 * this means only one of the two interfaces
+				 * can be trusted with DMA at any point in time.
+				 * So we should enable DMA only on one of the
+				 * two interfaces.
+				 */
+				simplex_stat = hwif->INB(dma_base + 2);
+				if (simplex_stat & 0x80) {
+					/* simplex device? */
+#if 0					
+/*
+ *	At this point we haven't probed the drives so we can't make the
+ *	appropriate decision. Really we should defer this problem
+ *	until we tune the drive then try to grab DMA ownership if we want
+ *	to be the DMA end. This has to be become dynamic to handle hot
+ *	plug.
+ */
+					/* Don't enable DMA on a simplex channel with no drives */
+					if (!hwif->drives[0].present && !hwif->drives[1].present)
+					{
+						printk(KERN_INFO "%s: simplex device with no drives: DMA disabled\n",
+								hwif->cds->name);
+						dma_base = 0;
+					}
+					/* If our other channel has DMA then we cannot */
+					else 
+#endif					
+					if(hwif->mate && hwif->mate->dma_base) 
+					{
+						printk(KERN_INFO "%s: simplex device: "
+							"DMA disabled\n",
+							hwif->cds->name);
+						dma_base = 0;
+					}
+				}
+		}
+	}
+	return dma_base;
+}
+
+static void ide_setup_pci_noise (struct pci_dev *dev, ide_pci_device_t *d)
+{
+	if ((d->vendor != dev->vendor) && (d->device != dev->device)) {
+		printk(KERN_INFO "%s: unknown IDE controller at PCI slot "
+			"%s, VID=%04x, DID=%04x\n",
+			d->name, dev->slot_name, dev->vendor, dev->device);
+        } else {
+		printk(KERN_INFO "%s: IDE controller at PCI slot %s\n",
+			d->name, dev->slot_name);
+	}
+}
+
+/**
+ *	ide_pci_enable	-	do PCI enables
+ *	@dev: PCI device
+ *	@d: IDE pci device data
+ *
+ *	Enable the IDE PCI device. We attempt to enable the device in full
+ *	but if that fails then we only need BAR4 so we will enable that.
+ *	
+ *	Returns zero on success or an error code
+ */
+ 
+static int ide_pci_enable(struct pci_dev *dev, ide_pci_device_t *d)
+{
+	
+	if (pci_enable_device(dev)) {
+		if (pci_enable_device_bars(dev, 1 << 4)) {
+			printk(KERN_WARNING "%s: (ide_setup_pci_device:) "
+				"Could not enable device.\n", d->name);
+			return -EBUSY;
+		} else
+			printk(KERN_WARNING "%s: Not fully BIOS configured!\n", d->name);
+	}
+
+	/*
+	 * assume all devices can do 32-bit dma for now. we can add a
+	 * dma mask field to the ide_pci_device_t if we need it (or let
+	 * lower level driver set the dma mask)
+	 */
+	if (pci_set_dma_mask(dev, 0xffffffff)) {
+		printk(KERN_ERR "%s: can't set dma mask\n", d->name);
+		return -EBUSY;
+	}
+	 
+	/* FIXME: Temporary - until we put in the hotplug interface logic
+	   Check that the bits we want are not in use by someone else */
+	if (pci_request_region(dev, 4, "ide_tmp"))
+		return -EBUSY;
+	pci_release_region(dev, 4);
+	
+	return 0;	
+}
+
+/**
+ *	ide_pci_configure	-	configure an unconfigured device
+ *	@dev: PCI device
+ *	@d: IDE pci device data
+ *
+ *	Enable and configure the PCI device we have been passed.
+ *	Returns zero on success or an error code.
+ */
+ 
+static int ide_pci_configure(struct pci_dev *dev, ide_pci_device_t *d)
+{
+	u16 pcicmd = 0;
+	/*
+	 * PnP BIOS was *supposed* to have setup this device, but we
+	 * can do it ourselves, so long as the BIOS has assigned an IRQ
+	 * (or possibly the device is using a "legacy header" for IRQs).
+	 * Maybe the user deliberately *disabled* the device,
+	 * but we'll eventually ignore it again if no drives respond.
+	 */
+	if (ide_setup_pci_baseregs(dev, d->name) || pci_write_config_word(dev, PCI_COMMAND, pcicmd|PCI_COMMAND_IO)) 
+	{
+		printk(KERN_INFO "%s: device disabled (BIOS)\n", d->name);
+		return -ENODEV;
+	}
+	if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) {
+		printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
+		return -EIO;
+	}
+	if (!(pcicmd & PCI_COMMAND_IO)) {
+		printk(KERN_ERR "%s: unable to enable IDE controller\n", d->name);
+		return -ENXIO;
+	}
+	return 0;
+}
+
+/**
+ *	ide_pci_check_iomem	-	check a register is I/O
+ *	@dev: pci device
+ *	@d: ide_pci_device
+ *	@bar: bar number
+ *
+ *	Checks if a BAR is configured and points to MMIO space. If so
+ *	print an error and return an error code. Otherwise return 0
+ */
+ 
+static int ide_pci_check_iomem(struct pci_dev *dev, ide_pci_device_t *d, int bar)
+{
+	ulong flags = pci_resource_flags(dev, bar);
+	
+	/* Unconfigured ? */
+	if (!flags || pci_resource_len(dev, bar) == 0)
+		return 0;
+
+	/* I/O space */		
+	if(flags & PCI_BASE_ADDRESS_IO_MASK)
+		return 0;
+		
+	/* Bad */
+	printk(KERN_ERR "%s: IO baseregs (BIOS) are reported "
+			"as MEM, report to "
+			"<andre@linux-ide.org>.\n", d->name);
+	return -EINVAL;
+}
+	
+		
+/**
+ *	ide_hwif_configure	-	configure an IDE interface
+ *	@dev: PCI device holding interface
+ *	@d: IDE pci data
+ *	@mate: Paired interface if any
+ *
+ *	Perform the initial set up for the hardware interface structure. This
+ *	is done per interface port rather than per PCI device. There may be
+ *	more than one port per device.
+ *
+ *	Returns the new hardware interface structure, or NULL on a failure
+ */
+ 
+static ide_hwif_t *ide_hwif_configure(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *mate, int port, int irq)
+{
+	unsigned long ctl = 0, base = 0;
+	ide_hwif_t *hwif;
+
+	/*  Possibly we should fail if these checks report true */
+	ide_pci_check_iomem(dev, d, 2*port);
+	ide_pci_check_iomem(dev, d, 2*port+1);
+ 
+	ctl  = pci_resource_start(dev, 2*port+1);
+	base = pci_resource_start(dev, 2*port);
+	if ((ctl && !base) || (base && !ctl)) {
+		printk(KERN_ERR "%s: inconsistent baseregs (BIOS) "
+			"for port %d, skipping\n", d->name, port);
+		return NULL;
+	}
+	if (!ctl)
+	{
+		/* Use default values */
+		ctl = port ? 0x374 : 0x3f4;
+		base = port ? 0x170 : 0x1f0;
+	}
+	if ((hwif = ide_match_hwif(base, d->bootable, d->name)) == NULL)
+		return NULL;	/* no room in ide_hwifs[] */
+	if (hwif->io_ports[IDE_DATA_OFFSET] != base) {
+fixup_address:
+		ide_init_hwif_ports(&hwif->hw, base, (ctl | 2), NULL);
+		memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
+		hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
+	} else if (hwif->io_ports[IDE_CONTROL_OFFSET] != (ctl | 2)) {
+		goto fixup_address;
+	}
+	hwif->chipset = ide_pci;
+	hwif->pci_dev = dev;
+	hwif->cds = (struct ide_pci_device_s *) d;
+	hwif->channel = port;
+
+	if (!hwif->irq)
+		hwif->irq = irq;
+	if (mate) {
+		hwif->mate = mate;
+		mate->mate = hwif;
+	}
+	return hwif;
+}
+
+/**
+ *	ide_hwif_setup_dma	-	configure DMA interface
+ *	@dev: PCI device
+ *	@d: IDE pci data
+ *	@hwif: Hardware interface we are configuring
+ *
+ *	Set up the DMA base for the interface. Enable the master bits as
+ *	neccessary and attempt to bring the device DMA into a ready to use
+ *	state
+ */
+ 
+static void ide_hwif_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
+{
+	u16 pcicmd;
+	pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
+
+	if ((d->autodma == AUTODMA) ||
+	    ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
+	     (dev->class & 0x80))) {
+		unsigned long dma_base = ide_get_or_set_dma_base(hwif);
+		if (dma_base && !(pcicmd & PCI_COMMAND_MASTER)) {
+			/*
+ 			 * Set up BM-DMA capability
+			 * (PnP BIOS should have done this)
+ 			 */
+			if (!((d->device == PCI_DEVICE_ID_CYRIX_5530_IDE && d->vendor == PCI_VENDOR_ID_CYRIX)
+			    ||(d->device == PCI_DEVICE_ID_NS_SCx200_IDE && d->vendor == PCI_VENDOR_ID_NS)))
+			{
+				/*
+				 * default DMA off if we had to
+				 * configure it here
+				 */
+				hwif->autodma = 0;
+			}
+			pci_set_master(dev);
+			if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) || !(pcicmd & PCI_COMMAND_MASTER)) {
+				printk(KERN_ERR "%s: %s error updating PCICMD\n",
+					hwif->name, d->name);
+				dma_base = 0;
+			}
+		}
+		if (dma_base) {
+			if (d->init_dma) {
+				d->init_dma(hwif, dma_base);
+			} else {
+				ide_setup_dma(hwif, dma_base, 8);
+			}
+		} else {
+			printk(KERN_INFO "%s: %s Bus-Master DMA disabled "
+				"(BIOS)\n", hwif->name, d->name);
+		}
+	}
+}
+
+/**
+ *	ide_setup_pci_controller	-	set up IDE PCI
+ *	@dev: PCI device
+ *	@d: IDE PCI data
+ *	@noisy: verbose flag
+ *	@config: returned as 1 if we configured the hardware
+ *
+ *	Set up the PCI and controller side of the IDE interface. This brings
+ *	up the PCI side of the device, checks that the device is enabled
+ *	and enables it if need be
+ */
+ 
+static int ide_setup_pci_controller(struct pci_dev *dev, ide_pci_device_t *d, int noisy, int *config)
+{
+	int ret = 0;
+	u32 class_rev;
+	u16 pcicmd;
+
+	if (!noautodma)
+		ret = 1;
+
+	if (noisy)
+		ide_setup_pci_noise(dev, d);
+
+	if (ide_pci_enable(dev, d))
+		return -EBUSY;
+		
+	if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) {
+		printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
+		return -EIO;
+	}
+	if (!(pcicmd & PCI_COMMAND_IO)) {	/* is device disabled? */
+		if (ide_pci_configure(dev, d))
+			return -ENODEV;
+		/* default DMA off if we had to configure it here */
+		ret = 0;
+		*config = 1;
+		printk(KERN_INFO "%s: device enabled (Linux)\n", d->name);
+	}
+
+	pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
+	class_rev &= 0xff;
+	if (noisy)
+		printk(KERN_INFO "%s: chipset revision %d\n", d->name, class_rev);
+	return ret;
+}
+
+/*
+ * ide_setup_pci_device() looks at the primary/secondary interfaces
+ * on a PCI IDE device and, if they are enabled, prepares the IDE driver
+ * for use with them.  This generic code works for most PCI chipsets.
+ *
+ * One thing that is not standardized is the location of the
+ * primary/secondary interface "enable/disable" bits.  For chipsets that
+ * we "know" about, this information is in the ide_pci_device_t struct;
+ * for all other chipsets, we just assume both interfaces are enabled.
+ */
+static ata_index_t do_ide_setup_pci_device (struct pci_dev *dev, ide_pci_device_t *d, u8 noisy)
+{
+	u32 port, at_least_one_hwif_enabled = 0, autodma = 0;
+	unsigned int pciirq = 0;
+	int tried_config = 0;
+	int drive0_tune, drive1_tune;
+	ata_index_t index;
+	u8 tmp = 0;
+	ide_hwif_t *hwif, *mate = NULL;
+	static int secondpdc = 0;
+
+	index.all = 0xf0f0;
+
+	if((autodma = ide_setup_pci_controller(dev, d, noisy, &tried_config)) < 0)
+		return index;
+
+	/*
+	 * Can we trust the reported IRQ?
+	 */
+	pciirq = dev->irq;
+	
+	if ((dev->class & ~(0xfa)) != ((PCI_CLASS_STORAGE_IDE << 8) | 5)) {
+		if (noisy)
+			printk(KERN_INFO "%s: not 100%% native mode: "
+				"will probe irqs later\n", d->name);
+		/*
+		 * This allows offboard ide-pci cards the enable a BIOS,
+		 * verify interrupt settings of split-mirror pci-config
+		 * space, place chipset into init-mode, and/or preserve
+		 * an interrupt if the card is not native ide support.
+		 */
+		pciirq = (d->init_chipset) ? d->init_chipset(dev, d->name) : 0;
+	} else if (tried_config) {
+		if (noisy)
+			printk(KERN_INFO "%s: will probe irqs later\n", d->name);
+		pciirq = 0;
+	} else if (!pciirq) {
+		if (noisy)
+			printk(KERN_WARNING "%s: bad irq (%d): will probe later\n",
+				d->name, pciirq);
+		pciirq = 0;
+	} else {
+		if (d->init_chipset)
+			d->init_chipset(dev, d->name);
+
+		if (noisy)
+#ifdef __sparc__
+			printk(KERN_INFO "%s: 100%% native mode on irq %s\n",
+			       d->name, __irq_itoa(pciirq));
+#else
+			printk(KERN_INFO "%s: 100%% native mode on irq %d\n",
+				d->name, pciirq);
+#endif
+	}
+	
+	/*
+	 * Set up the IDE ports
+	 */
+	 
+	for (port = 0; port <= 1; ++port) {
+		ide_pci_enablebit_t *e = &(d->enablebits[port]);
+	
+		/* 
+		 * If this is a Promise FakeRaid controller,
+		 * the 2nd controller will be marked as 
+		 * disabled while it is actually there and enabled
+		 * by the bios for raid purposes. 
+		 * Skip the normal "is it enabled" test for those.
+		 */
+		if (((d->vendor == PCI_VENDOR_ID_PROMISE) &&
+		     ((d->device == PCI_DEVICE_ID_PROMISE_20262) ||
+		      (d->device == PCI_DEVICE_ID_PROMISE_20265))) &&
+		    (secondpdc++==1) && (port==1))
+			goto controller_ok;
+			
+		if (e->reg && (pci_read_config_byte(dev, e->reg, &tmp) ||
+		    (tmp & e->mask) != e->val))
+			continue;	/* port not enabled */
+controller_ok:
+
+		if (d->channels	<= port)
+			return index;
+	
+		if ((hwif = ide_hwif_configure(dev, d, mate, port, pciirq)) == NULL)
+			continue;
+
+		/* setup proper ancestral information */
+		// 2.5 only hwif->gendev.parent = &dev->dev;
+
+		if (hwif->channel) {
+			index.b.high = hwif->index;
+		} else {
+			index.b.low = hwif->index;
+		}
+
+		
+		if (d->init_iops)
+			d->init_iops(hwif);
+
+		if (d->autodma == NODMA)
+			goto bypass_legacy_dma;
+		if (d->autodma == NOAUTODMA)
+			autodma = 0;
+		if (autodma)
+			hwif->autodma = 1;
+		ide_hwif_setup_dma(dev, d, hwif);
+bypass_legacy_dma:
+
+		drive0_tune = hwif->drives[0].autotune;
+		drive1_tune = hwif->drives[1].autotune;
+
+		if (d->init_hwif)
+			/* Call chipset-specific routine
+			 * for each enabled hwif
+			 */
+			d->init_hwif(hwif);
+
+		mate = hwif;
+		at_least_one_hwif_enabled = 1;
+	}
+	if (!at_least_one_hwif_enabled)
+		printk(KERN_INFO "%s: neither IDE port enabled (BIOS)\n", d->name);
+	return index;
+}
+
+void ide_setup_pci_device (struct pci_dev *dev, ide_pci_device_t *d)
+{
+	do_ide_setup_pci_device(dev, d, 1);
+}
+
+EXPORT_SYMBOL_GPL(ide_setup_pci_device);
+
+void ide_setup_pci_devices (struct pci_dev *dev, struct pci_dev *dev2, ide_pci_device_t *d)
+{
+	do_ide_setup_pci_device(dev, d, 1);
+	do_ide_setup_pci_device(dev2, d, 0);
+}
+
+EXPORT_SYMBOL_GPL(ide_setup_pci_devices);
+
+/*
+ *	Module interfaces
+ */
+ 
+static int pre_init = 1;		/* Before first ordered IDE scan */
+static LIST_HEAD(ide_pci_drivers);
+
+/*
+ *	ide_register_pci_driver		-	attach IDE driver
+ *	@driver: pci driver
+ *
+ *	Registers a driver with the IDE layer. The IDE layer arranges that
+ *	boot time setup is done in the expected device order and then 
+ *	hands the controllers off to the core PCI code to do the rest of
+ *	the work.
+ *
+ *	The driver_data of the driver table must point to an ide_pci_device_t
+ *	describing the interface.
+ *
+ *	Returns are the same as for pci_register_driver
+ */
+
+int ide_pci_register_driver(struct pci_driver *driver)
+{
+	if(!pre_init)
+		return pci_module_init(driver);
+	list_add_tail(&driver->node, &ide_pci_drivers);
+	return 0;
+}
+
+EXPORT_SYMBOL_GPL(ide_pci_register_driver);
+
+/**
+ *	ide_unregister_pci_driver	-	unregister an IDE driver
+ *	@driver: driver to remove
+ *
+ *	Unregister a currently installed IDE driver. Returns are the same
+ *	as for pci_unregister_driver
+ */
+ 
+void ide_pci_unregister_driver(struct pci_driver *driver)
+{
+	if(!pre_init)
+		pci_unregister_driver(driver);
+	else
+		list_del(&driver->node);
+}
+
+EXPORT_SYMBOL_GPL(ide_pci_unregister_driver);
+
+/**
+ *	ide_scan_pcidev		-	find an IDE driver for a device
+ *	@dev: PCI device to check
+ *
+ *	Look for an IDE driver to handle the device we are considering.
+ *	This is only used during boot up to get the ordering correct. After
+ *	boot up the pci layer takes over the job.
+ */
+ 
+static int __init ide_scan_pcidev(struct pci_dev *dev)
+{
+	struct list_head *l;
+	struct pci_driver *d;
+	
+	list_for_each(l, &ide_pci_drivers)
+	{
+		d = list_entry(l, struct pci_driver, node);
+		if(d->id_table)
+		{
+			const struct pci_device_id *id = pci_match_device(d->id_table, dev);
+			if(id != NULL)
+			{
+				if(d->probe(dev, id) >= 0)
+				{
+					dev->driver = d;
+					return 1;
+				}
+			}
+		}
+	}
+	return 0;
+}
+
+/**
+ *	ide_scan_pcibus		-	perform the initial IDE driver scan
+ *	@scan_direction: set for reverse order scanning
+ *
+ *	Perform the initial bus rather than driver ordered scan of the
+ *	PCI drivers. After this all IDE pci handling becomes standard
+ *	module ordering not traditionally ordered.
+ */
+ 	
+void __init ide_scan_pcibus (int scan_direction)
+{
+	struct pci_dev *dev;
+	struct pci_driver *d;
+	struct list_head *l, *n;
+
+	pre_init = 0;
+	if (!scan_direction) {
+		pci_for_each_dev(dev) {
+			ide_scan_pcidev(dev);
+		}
+	} else {
+		pci_for_each_dev_reverse(dev) {
+			ide_scan_pcidev(dev);
+		}
+	}
+	
+	/*
+	 *	Hand the drivers over to the PCI layer now we
+	 *	are post init.
+	 */
+
+	list_for_each_safe(l, n, &ide_pci_drivers)
+	{
+		list_del(l);
+		d = list_entry(l, struct pci_driver, node);
+		pci_register_driver(d);
+	}
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)