2 * linux/drivers/ide/setup-pci.c Version 1.10 2002/08/19
4 * Copyright (c) 1998-2000 Andre Hedrick <andre@linux-ide.org>
6 * Copyright (c) 1995-1998 Mark Lord
7 * May be copied or modified under the terms of the GNU General Public License
10 * Split the set up function into multiple functions
12 * Fix misreporting of I/O v MMIO problems
13 * Initial fixups for simplex devices
17 * This module provides support for automatic detection and
18 * configuration of all PCI IDE interfaces present in a system.
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/kernel.h>
25 #include <linux/pci.h>
26 #include <linux/init.h>
27 #include <linux/timer.h>
29 #include <linux/interrupt.h>
30 #include <linux/ide.h>
37 * ide_match_hwif - match a PCI IDE against an ide_hwif
38 * @io_base: I/O base of device
39 * @bootable: set if its bootable
40 * @name: name of device
42 * Match a PCI IDE port against an entry in ide_hwifs[],
43 * based on io_base port if possible. Return the matching hwif,
44 * or a new hwif. If we find an error (clashing, out of devices, etc)
47 * FIXME: we need to handle mmio matches here too
50 static ide_hwif_t *ide_match_hwif(unsigned long io_base, u8 bootable, const char *name)
56 * Look for a hwif with matching io_base specified using
57 * parameters to ide_setup().
59 for (h = 0; h < MAX_HWIFS; ++h) {
61 if (hwif->io_ports[IDE_DATA_OFFSET] == io_base) {
62 if (hwif->chipset == ide_forced)
63 return hwif; /* a perfect match */
67 * Look for a hwif with matching io_base default value.
68 * If chipset is "ide_unknown", then claim that hwif slot.
69 * Otherwise, some other chipset has already claimed it.. :(
71 for (h = 0; h < MAX_HWIFS; ++h) {
73 if (hwif->io_ports[IDE_DATA_OFFSET] == io_base) {
74 if (hwif->chipset == ide_unknown)
75 return hwif; /* match */
76 printk(KERN_ERR "%s: port 0x%04lx already claimed by %s\n",
77 name, io_base, hwif->name);
78 return NULL; /* already claimed */
82 * Okay, there is no hwif matching our io_base,
83 * so we'll just claim an unassigned slot.
84 * Give preference to claiming other slots before claiming ide0/ide1,
85 * just in case there's another interface yet-to-be-scanned
86 * which uses ports 1f0/170 (the ide0/ide1 defaults).
88 * Unless there is a bootable card that does not use the standard
89 * ports 1f0/170 (the ide0/ide1 defaults). The (bootable) flag.
92 for (h = 0; h < MAX_HWIFS; ++h) {
94 if (hwif->chipset == ide_unknown)
95 return hwif; /* pick an unused entry */
98 for (h = 2; h < MAX_HWIFS; ++h) {
100 if (hwif->chipset == ide_unknown)
101 return hwif; /* pick an unused entry */
104 for (h = 0; h < 2; ++h) {
105 hwif = ide_hwifs + h;
106 if (hwif->chipset == ide_unknown)
107 return hwif; /* pick an unused entry */
109 printk(KERN_ERR "%s: too many IDE interfaces, no room in table\n", name);
114 * ide_setup_pci_baseregs - place a PCI IDE controller native
115 * @dev: PCI device of interface to switch native
116 * @name: Name of interface
118 * We attempt to place the PCI interface into PCI native mode. If
119 * we succeed the BARs are ok and the controller is in PCI mode.
120 * Returns 0 on success or an errno code.
122 * FIXME: if we program the interface and then fail to set the BARS
123 * we don't switch it back to legacy mode. Do we actually care ??
126 static int ide_setup_pci_baseregs (struct pci_dev *dev, const char *name)
131 * Place both IDE interfaces into PCI "native" mode:
133 if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
135 if ((progif & 0xa) != 0xa) {
136 printk(KERN_INFO "%s: device not capable of full "
137 "native PCI mode\n", name);
140 printk("%s: placing both ports into native PCI mode\n", name);
141 (void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5);
142 if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
144 printk(KERN_ERR "%s: rewrite of PROGIF failed, wanted "
145 "0x%04x, got 0x%04x\n",
146 name, progif|5, progif);
153 #ifdef CONFIG_BLK_DEV_IDEDMA_PCI
155 #ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
157 * Long lost data from 2.0.34 that is now in 2.0.39
159 * This was used in ./drivers/block/triton.c to do DMA Base address setup
160 * when PnP failed. Oh the things we forget. I believe this was part
161 * of SFF-8038i that has been withdrawn from public access... :-((
163 #define DEFAULT_BMIBA 0xe800 /* in case BIOS did not init it */
164 #define DEFAULT_BMCRBA 0xcc00 /* VIA's default value */
165 #define DEFAULT_BMALIBA 0xd400 /* ALI's default value */
166 #endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */
169 * ide_get_or_set_dma_base - setup BMIBA
172 * Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space:
173 * If need be we set up the DMA base. Where a device has a partner that
174 * is already in DMA mode we check and enforce IDE simplex rules.
177 static unsigned long ide_get_or_set_dma_base (ide_hwif_t *hwif)
179 unsigned long dma_base = 0;
180 struct pci_dev *dev = hwif->pci_dev;
182 #ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
183 int second_chance = 0;
185 second_chance_to_dma:
186 #endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */
188 if ((hwif->mmio) && (hwif->dma_base))
189 return hwif->dma_base;
191 if (hwif->mate && hwif->mate->dma_base) {
192 dma_base = hwif->mate->dma_base - (hwif->channel ? 0 : 8);
194 dma_base = (hwif->mmio) ?
195 ((unsigned long) hwif->hwif_data) :
196 (pci_resource_start(dev, 4));
198 printk(KERN_ERR "%s: dma_base is invalid (0x%04lx)\n",
199 hwif->cds->name, dma_base);
204 #ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
205 /* FIXME - should use pci_assign_resource surely */
206 if ((!dma_base) && (!second_chance)) {
207 unsigned long set_bmiba = 0;
209 switch(dev->vendor) {
210 case PCI_VENDOR_ID_AL:
211 set_bmiba = DEFAULT_BMALIBA; break;
212 case PCI_VENDOR_ID_VIA:
213 set_bmiba = DEFAULT_BMCRBA; break;
214 case PCI_VENDOR_ID_INTEL:
215 set_bmiba = DEFAULT_BMIBA; break;
219 pci_write_config_dword(dev, 0x20, set_bmiba|1);
220 goto second_chance_to_dma;
222 #endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */
226 dma_base += hwif->channel ? 8 : 0;
228 switch(dev->device) {
229 case PCI_DEVICE_ID_AL_M5219:
230 case PCI_DEVICE_ID_AL_M5229:
231 case PCI_DEVICE_ID_AMD_VIPER_7409:
232 case PCI_DEVICE_ID_CMD_643:
233 case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
234 simplex_stat = hwif->INB(dma_base + 2);
235 hwif->OUTB((simplex_stat&0x60),(dma_base + 2));
236 simplex_stat = hwif->INB(dma_base + 2);
237 if (simplex_stat & 0x80) {
238 printk(KERN_INFO "%s: simplex device: "
245 * If the device claims "simplex" DMA,
246 * this means only one of the two interfaces
247 * can be trusted with DMA at any point in time.
248 * So we should enable DMA only on one of the
251 simplex_stat = hwif->INB(dma_base + 2);
252 if (simplex_stat & 0x80) {
253 /* simplex device? */
256 * At this point we haven't probed the drives so we can't make the
257 * appropriate decision. Really we should defer this problem
258 * until we tune the drive then try to grab DMA ownership if we want
259 * to be the DMA end. This has to be become dynamic to handle hot
262 /* Don't enable DMA on a simplex channel with no drives */
263 if (!hwif->drives[0].present && !hwif->drives[1].present)
265 printk(KERN_INFO "%s: simplex device with no drives: DMA disabled\n",
269 /* If our other channel has DMA then we cannot */
272 if(hwif->mate && hwif->mate->dma_base)
274 printk(KERN_INFO "%s: simplex device: "
284 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
286 void ide_setup_pci_noise (struct pci_dev *dev, ide_pci_device_t *d)
288 if ((d->vendor != dev->vendor) && (d->device != dev->device)) {
289 printk(KERN_INFO "%s: unknown IDE controller at PCI slot "
290 "%s, VID=%04x, DID=%04x\n",
291 d->name, pci_name(dev), dev->vendor, dev->device);
293 printk(KERN_INFO "%s: IDE controller at PCI slot %s\n",
294 d->name, pci_name(dev));
298 EXPORT_SYMBOL_GPL(ide_setup_pci_noise);
302 * ide_pci_enable - do PCI enables
304 * @d: IDE pci device data
306 * Enable the IDE PCI device. We attempt to enable the device in full
307 * but if that fails then we only need BAR4 so we will enable that.
309 * Returns zero on success or an error code
312 static int ide_pci_enable(struct pci_dev *dev, ide_pci_device_t *d)
315 if (pci_enable_device(dev)) {
316 if (pci_enable_device_bars(dev, 1 << 4)) {
317 printk(KERN_WARNING "%s: (ide_setup_pci_device:) "
318 "Could not enable device.\n", d->name);
321 printk(KERN_WARNING "%s: BIOS configuration fixed.\n", d->name);
325 * assume all devices can do 32-bit dma for now. we can add a
326 * dma mask field to the ide_pci_device_t if we need it (or let
327 * lower level driver set the dma mask)
329 if (pci_set_dma_mask(dev, 0xffffffff)) {
330 printk(KERN_ERR "%s: can't set dma mask\n", d->name);
334 /* FIXME: Temporary - until we put in the hotplug interface logic
335 Check that the bits we want are not in use by someone else */
336 if (pci_request_region(dev, 4, "ide_tmp"))
338 pci_release_region(dev, 4);
344 * ide_pci_configure - configure an unconfigured device
346 * @d: IDE pci device data
348 * Enable and configure the PCI device we have been passed.
349 * Returns zero on success or an error code.
352 static int ide_pci_configure(struct pci_dev *dev, ide_pci_device_t *d)
356 * PnP BIOS was *supposed* to have setup this device, but we
357 * can do it ourselves, so long as the BIOS has assigned an IRQ
358 * (or possibly the device is using a "legacy header" for IRQs).
359 * Maybe the user deliberately *disabled* the device,
360 * but we'll eventually ignore it again if no drives respond.
362 if (ide_setup_pci_baseregs(dev, d->name) || pci_write_config_word(dev, PCI_COMMAND, pcicmd|PCI_COMMAND_IO))
364 printk(KERN_INFO "%s: device disabled (BIOS)\n", d->name);
367 if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) {
368 printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
371 if (!(pcicmd & PCI_COMMAND_IO)) {
372 printk(KERN_ERR "%s: unable to enable IDE controller\n", d->name);
379 * ide_pci_check_iomem - check a register is I/O
384 * Checks if a BAR is configured and points to MMIO space. If so
385 * print an error and return an error code. Otherwise return 0
388 static int ide_pci_check_iomem(struct pci_dev *dev, ide_pci_device_t *d, int bar)
390 ulong flags = pci_resource_flags(dev, bar);
393 if (!flags || pci_resource_len(dev, bar) == 0)
397 if(flags & PCI_BASE_ADDRESS_IO_MASK)
401 printk(KERN_ERR "%s: IO baseregs (BIOS) are reported "
403 "<andre@linux-ide.org>.\n", d->name);
408 * ide_hwif_configure - configure an IDE interface
409 * @dev: PCI device holding interface
411 * @mate: Paired interface if any
413 * Perform the initial set up for the hardware interface structure. This
414 * is done per interface port rather than per PCI device. There may be
415 * more than one port per device.
417 * Returns the new hardware interface structure, or NULL on a failure
420 static ide_hwif_t *ide_hwif_configure(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *mate, int port, int irq)
422 unsigned long ctl = 0, base = 0;
427 /* Possibly we should fail if these checks report true */
428 ide_pci_check_iomem(dev, d, 2*port);
429 ide_pci_check_iomem(dev, d, 2*port+1);
431 ctl = pci_resource_start(dev, 2*port+1);
432 base = pci_resource_start(dev, 2*port);
433 if ((ctl && !base) || (base && !ctl)) {
434 printk(KERN_ERR "%s: inconsistent baseregs (BIOS) "
435 "for port %d, skipping\n", d->name, port);
441 /* Use default values */
442 ctl = port ? 0x374 : 0x3f4;
443 base = port ? 0x170 : 0x1f0;
445 if ((hwif = ide_match_hwif(base, d->bootable, d->name)) == NULL)
446 return NULL; /* no room in ide_hwifs[] */
447 if (hwif->io_ports[IDE_DATA_OFFSET] != base ||
448 hwif->io_ports[IDE_CONTROL_OFFSET] != (ctl | 2)) {
449 memset(&hwif->hw, 0, sizeof(hwif->hw));
450 ide_init_hwif_ports(&hwif->hw, base, (ctl | 2), NULL);
451 memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
452 hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
454 hwif->chipset = ide_pci;
456 hwif->cds = (struct ide_pci_device_s *) d;
457 hwif->channel = port;
469 * ide_hwif_setup_dma - configure DMA interface
472 * @hwif: Hardware interface we are configuring
474 * Set up the DMA base for the interface. Enable the master bits as
475 * necessary and attempt to bring the device DMA into a ready to use
479 #ifndef CONFIG_BLK_DEV_IDEDMA_PCI
480 static void ide_hwif_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
484 static void ide_hwif_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
487 pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
489 if ((d->autodma == AUTODMA) ||
490 ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
491 (dev->class & 0x80))) {
492 unsigned long dma_base = ide_get_or_set_dma_base(hwif);
493 if (dma_base && !(pcicmd & PCI_COMMAND_MASTER)) {
495 * Set up BM-DMA capability
496 * (PnP BIOS should have done this)
498 if (!((d->device == PCI_DEVICE_ID_CYRIX_5530_IDE && d->vendor == PCI_VENDOR_ID_CYRIX)
499 ||(d->device == PCI_DEVICE_ID_NS_SCx200_IDE && d->vendor == PCI_VENDOR_ID_NS)))
502 * default DMA off if we had to
508 if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) || !(pcicmd & PCI_COMMAND_MASTER)) {
509 printk(KERN_ERR "%s: %s error updating PCICMD\n",
510 hwif->name, d->name);
516 d->init_dma(hwif, dma_base);
518 ide_setup_dma(hwif, dma_base, 8);
521 printk(KERN_INFO "%s: %s Bus-Master DMA disabled "
522 "(BIOS)\n", hwif->name, d->name);
526 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI*/
529 * ide_setup_pci_controller - set up IDE PCI
532 * @noisy: verbose flag
533 * @config: returned as 1 if we configured the hardware
535 * Set up the PCI and controller side of the IDE interface. This brings
536 * up the PCI side of the device, checks that the device is enabled
537 * and enables it if need be
540 static int ide_setup_pci_controller(struct pci_dev *dev, ide_pci_device_t *d, int noisy, int *config)
550 ide_setup_pci_noise(dev, d);
552 if (ide_pci_enable(dev, d))
555 if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) {
556 printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
559 if (!(pcicmd & PCI_COMMAND_IO)) { /* is device disabled? */
560 if (ide_pci_configure(dev, d))
562 /* default DMA off if we had to configure it here */
565 printk(KERN_INFO "%s: device enabled (Linux)\n", d->name);
568 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
571 printk(KERN_INFO "%s: chipset revision %d\n", d->name, class_rev);
576 * ide_pci_setup_ports - configure ports/devices on PCI IDE
578 * @d: IDE pci device info
579 * @autodma: Should we enable DMA
581 * @index: ata index to update
583 * Scan the interfaces attached to this device and do any
584 * necessary per port setup. Attach the devices and ask the
585 * generic DMA layer to do its work for us.
587 * Normally called automaticall from do_ide_pci_setup_device,
588 * but is also used directly as a helper function by some controllers
589 * where the chipset setup is not the default PCI IDE one.
592 void ide_pci_setup_ports(struct pci_dev *dev, ide_pci_device_t *d, int autodma, int pciirq, ata_index_t *index)
595 int at_least_one_hwif_enabled = 0;
596 ide_hwif_t *hwif, *mate = NULL;
597 static int secondpdc = 0;
603 * Set up the IDE ports
606 for (port = 0; port <= 1; ++port) {
607 ide_pci_enablebit_t *e = &(d->enablebits[port]);
610 * If this is a Promise FakeRaid controller,
611 * the 2nd controller will be marked as
612 * disabled while it is actually there and enabled
613 * by the bios for raid purposes.
614 * Skip the normal "is it enabled" test for those.
616 if (((d->vendor == PCI_VENDOR_ID_PROMISE) &&
617 ((d->device == PCI_DEVICE_ID_PROMISE_20262) ||
618 (d->device == PCI_DEVICE_ID_PROMISE_20265))) &&
619 (secondpdc++==1) && (port==1))
622 if (e->reg && (pci_read_config_byte(dev, e->reg, &tmp) ||
623 (tmp & e->mask) != e->val))
624 continue; /* port not enabled */
627 if (d->channels <= port)
630 if ((hwif = ide_hwif_configure(dev, d, mate, port, pciirq)) == NULL)
633 /* setup proper ancestral information */
634 hwif->gendev.parent = &dev->dev;
637 index->b.high = hwif->index;
639 index->b.low = hwif->index;
646 if (d->autodma == NODMA)
647 goto bypass_legacy_dma;
648 if (d->autodma == NOAUTODMA)
653 if(d->init_setup_dma)
654 d->init_setup_dma(dev, d, hwif);
656 ide_hwif_setup_dma(dev, d, hwif);
659 /* Call chipset-specific routine
660 * for each enabled hwif
665 at_least_one_hwif_enabled = 1;
667 if (!at_least_one_hwif_enabled)
668 printk(KERN_INFO "%s: neither IDE port enabled (BIOS)\n", d->name);
671 EXPORT_SYMBOL_GPL(ide_pci_setup_ports);
674 * ide_setup_pci_device() looks at the primary/secondary interfaces
675 * on a PCI IDE device and, if they are enabled, prepares the IDE driver
676 * for use with them. This generic code works for most PCI chipsets.
678 * One thing that is not standardized is the location of the
679 * primary/secondary interface "enable/disable" bits. For chipsets that
680 * we "know" about, this information is in the ide_pci_device_t struct;
681 * for all other chipsets, we just assume both interfaces are enabled.
683 static ata_index_t do_ide_setup_pci_device (struct pci_dev *dev, ide_pci_device_t *d, u8 noisy)
687 int tried_config = 0;
688 ata_index_t index = { .b = { .low = 0xff, .high = 0xff } };
690 if((autodma = ide_setup_pci_controller(dev, d, noisy, &tried_config)) < 0)
694 * Can we trust the reported IRQ?
698 /* Is it an "IDE storage" device in non-PCI mode? */
699 if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE && (dev->class & 5) != 5) {
701 printk(KERN_INFO "%s: not 100%% native mode: "
702 "will probe irqs later\n", d->name);
704 * This allows offboard ide-pci cards the enable a BIOS,
705 * verify interrupt settings of split-mirror pci-config
706 * space, place chipset into init-mode, and/or preserve
707 * an interrupt if the card is not native ide support.
709 pciirq = (d->init_chipset) ? d->init_chipset(dev, d->name) : 0;
710 } else if (tried_config) {
712 printk(KERN_INFO "%s: will probe irqs later\n", d->name);
714 } else if (!pciirq) {
716 printk(KERN_WARNING "%s: bad irq (%d): will probe later\n",
722 if(d->init_chipset(dev, d->name) < 0)
727 printk(KERN_INFO "%s: 100%% native mode on irq %s\n",
728 d->name, __irq_itoa(pciirq));
730 printk(KERN_INFO "%s: 100%% native mode on irq %d\n",
735 if(pciirq < 0) /* Error not an IRQ */
738 ide_pci_setup_ports(dev, d, autodma, pciirq, &index);
743 void ide_setup_pci_device (struct pci_dev *dev, ide_pci_device_t *d)
745 ata_index_t index_list = do_ide_setup_pci_device(dev, d, 1);
747 if ((index_list.b.low & 0xf0) != 0xf0)
748 probe_hwif_init(&ide_hwifs[index_list.b.low]);
749 if ((index_list.b.high & 0xf0) != 0xf0)
750 probe_hwif_init(&ide_hwifs[index_list.b.high]);
752 create_proc_ide_interfaces();
755 EXPORT_SYMBOL_GPL(ide_setup_pci_device);
757 void ide_setup_pci_devices (struct pci_dev *dev, struct pci_dev *dev2, ide_pci_device_t *d)
759 ata_index_t index_list = do_ide_setup_pci_device(dev, d, 1);
760 ata_index_t index_list2 = do_ide_setup_pci_device(dev2, d, 0);
762 if ((index_list.b.low & 0xf0) != 0xf0)
763 probe_hwif_init(&ide_hwifs[index_list.b.low]);
764 if ((index_list.b.high & 0xf0) != 0xf0)
765 probe_hwif_init(&ide_hwifs[index_list.b.high]);
766 if ((index_list2.b.low & 0xf0) != 0xf0)
767 probe_hwif_init(&ide_hwifs[index_list2.b.low]);
768 if ((index_list2.b.high & 0xf0) != 0xf0)
769 probe_hwif_init(&ide_hwifs[index_list2.b.high]);
771 create_proc_ide_interfaces();
774 EXPORT_SYMBOL_GPL(ide_setup_pci_devices);
780 static int pre_init = 1; /* Before first ordered IDE scan */
781 static LIST_HEAD(ide_pci_drivers);
784 * ide_register_pci_driver - attach IDE driver
785 * @driver: pci driver
787 * Registers a driver with the IDE layer. The IDE layer arranges that
788 * boot time setup is done in the expected device order and then
789 * hands the controllers off to the core PCI code to do the rest of
792 * The driver_data of the driver table must point to an ide_pci_device_t
793 * describing the interface.
795 * Returns are the same as for pci_register_driver
798 int ide_pci_register_driver(struct pci_driver *driver)
801 return pci_module_init(driver);
802 list_add_tail(&driver->node, &ide_pci_drivers);
806 EXPORT_SYMBOL_GPL(ide_pci_register_driver);
809 * ide_unregister_pci_driver - unregister an IDE driver
810 * @driver: driver to remove
812 * Unregister a currently installed IDE driver. Returns are the same
813 * as for pci_unregister_driver
816 void ide_pci_unregister_driver(struct pci_driver *driver)
819 pci_unregister_driver(driver);
821 list_del(&driver->node);
824 EXPORT_SYMBOL_GPL(ide_pci_unregister_driver);
827 * ide_scan_pcidev - find an IDE driver for a device
828 * @dev: PCI device to check
830 * Look for an IDE driver to handle the device we are considering.
831 * This is only used during boot up to get the ordering correct. After
832 * boot up the pci layer takes over the job.
835 static int __init ide_scan_pcidev(struct pci_dev *dev)
838 struct pci_driver *d;
840 list_for_each(l, &ide_pci_drivers)
842 d = list_entry(l, struct pci_driver, node);
845 const struct pci_device_id *id = pci_match_device(d->id_table, dev);
848 if(d->probe(dev, id) >= 0)
860 * ide_scan_pcibus - perform the initial IDE driver scan
861 * @scan_direction: set for reverse order scanning
863 * Perform the initial bus rather than driver ordered scan of the
864 * PCI drivers. After this all IDE pci handling becomes standard
865 * module ordering not traditionally ordered.
868 void __init ide_scan_pcibus (int scan_direction)
870 struct pci_dev *dev = NULL;
871 struct pci_driver *d;
872 struct list_head *l, *n;
875 if (!scan_direction) {
876 while ((dev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
877 ide_scan_pcidev(dev);
880 while ((dev = pci_find_device_reverse(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
881 ide_scan_pcidev(dev);
886 * Hand the drivers over to the PCI layer now we
890 list_for_each_safe(l, n, &ide_pci_drivers)
893 d = list_entry(l, struct pci_driver, node);
894 pci_register_driver(d);