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/module.h>
22 #include <linux/types.h>
23 #include <linux/kernel.h>
24 #include <linux/pci.h>
25 #include <linux/init.h>
26 #include <linux/timer.h>
28 #include <linux/interrupt.h>
29 #include <linux/ide.h>
30 #include <linux/dma-mapping.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 < MAX_HWIFS; ++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 */
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 = pci_resource_start(dev, 4);
196 printk(KERN_ERR "%s: dma_base is invalid\n",
201 #ifdef CONFIG_BLK_DEV_IDEDMA_FORCED
202 /* FIXME - should use pci_assign_resource surely */
203 if ((!dma_base) && (!second_chance)) {
204 unsigned long set_bmiba = 0;
206 switch(dev->vendor) {
207 case PCI_VENDOR_ID_AL:
208 set_bmiba = DEFAULT_BMALIBA; break;
209 case PCI_VENDOR_ID_VIA:
210 set_bmiba = DEFAULT_BMCRBA; break;
211 case PCI_VENDOR_ID_INTEL:
212 set_bmiba = DEFAULT_BMIBA; break;
216 pci_write_config_dword(dev, 0x20, set_bmiba|1);
217 goto second_chance_to_dma;
219 #endif /* CONFIG_BLK_DEV_IDEDMA_FORCED */
223 dma_base += hwif->channel ? 8 : 0;
225 switch(dev->device) {
226 case PCI_DEVICE_ID_AL_M5219:
227 case PCI_DEVICE_ID_AL_M5229:
228 case PCI_DEVICE_ID_AMD_VIPER_7409:
229 case PCI_DEVICE_ID_CMD_643:
230 case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
231 case PCI_DEVICE_ID_REVOLUTION:
232 simplex_stat = hwif->INB(dma_base + 2);
233 hwif->OUTB((simplex_stat&0x60),(dma_base + 2));
234 simplex_stat = hwif->INB(dma_base + 2);
235 if (simplex_stat & 0x80) {
236 printk(KERN_INFO "%s: simplex device: "
243 * If the device claims "simplex" DMA,
244 * this means only one of the two interfaces
245 * can be trusted with DMA at any point in time.
246 * So we should enable DMA only on one of the
249 simplex_stat = hwif->INB(dma_base + 2);
250 if (simplex_stat & 0x80) {
251 /* simplex device? */
253 * At this point we haven't probed the drives so we can't make the
254 * appropriate decision. Really we should defer this problem
255 * until we tune the drive then try to grab DMA ownership if we want
256 * to be the DMA end. This has to be become dynamic to handle hot
259 if (hwif->mate && hwif->mate->dma_base) {
260 printk(KERN_INFO "%s: simplex device: "
270 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
272 void ide_setup_pci_noise (struct pci_dev *dev, ide_pci_device_t *d)
274 printk(KERN_INFO "%s: IDE controller at PCI slot %s\n",
275 d->name, pci_name(dev));
278 EXPORT_SYMBOL_GPL(ide_setup_pci_noise);
282 * ide_pci_enable - do PCI enables
284 * @d: IDE pci device data
286 * Enable the IDE PCI device. We attempt to enable the device in full
287 * but if that fails then we only need BAR4 so we will enable that.
289 * Returns zero on success or an error code
292 static int ide_pci_enable(struct pci_dev *dev, ide_pci_device_t *d)
296 if (pci_enable_device(dev)) {
297 ret = pci_enable_device_bars(dev, 1 << 4);
299 printk(KERN_WARNING "%s: (ide_setup_pci_device:) "
300 "Could not enable device.\n", d->name);
303 printk(KERN_WARNING "%s: BIOS configuration fixed.\n", d->name);
307 * assume all devices can do 32-bit dma for now. we can add a
308 * dma mask field to the ide_pci_device_t if we need it (or let
309 * lower level driver set the dma mask)
311 ret = pci_set_dma_mask(dev, DMA_32BIT_MASK);
313 printk(KERN_ERR "%s: can't set dma mask\n", d->name);
317 /* FIXME: Temporary - until we put in the hotplug interface logic
318 Check that the bits we want are not in use by someone else. */
319 ret = pci_request_region(dev, 4, "ide_tmp");
323 pci_release_region(dev, 4);
329 * ide_pci_configure - configure an unconfigured device
331 * @d: IDE pci device data
333 * Enable and configure the PCI device we have been passed.
334 * Returns zero on success or an error code.
337 static int ide_pci_configure(struct pci_dev *dev, ide_pci_device_t *d)
341 * PnP BIOS was *supposed* to have setup this device, but we
342 * can do it ourselves, so long as the BIOS has assigned an IRQ
343 * (or possibly the device is using a "legacy header" for IRQs).
344 * Maybe the user deliberately *disabled* the device,
345 * but we'll eventually ignore it again if no drives respond.
347 if (ide_setup_pci_baseregs(dev, d->name) || pci_write_config_word(dev, PCI_COMMAND, pcicmd|PCI_COMMAND_IO))
349 printk(KERN_INFO "%s: device disabled (BIOS)\n", d->name);
352 if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) {
353 printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
356 if (!(pcicmd & PCI_COMMAND_IO)) {
357 printk(KERN_ERR "%s: unable to enable IDE controller\n", d->name);
364 * ide_pci_check_iomem - check a register is I/O
369 * Checks if a BAR is configured and points to MMIO space. If so
370 * print an error and return an error code. Otherwise return 0
373 static int ide_pci_check_iomem(struct pci_dev *dev, ide_pci_device_t *d, int bar)
375 ulong flags = pci_resource_flags(dev, bar);
378 if (!flags || pci_resource_len(dev, bar) == 0)
382 if(flags & PCI_BASE_ADDRESS_IO_MASK)
386 printk(KERN_ERR "%s: IO baseregs (BIOS) are reported "
388 "<andre@linux-ide.org>.\n", d->name);
393 * ide_hwif_configure - configure an IDE interface
394 * @dev: PCI device holding interface
396 * @mate: Paired interface if any
398 * Perform the initial set up for the hardware interface structure. This
399 * is done per interface port rather than per PCI device. There may be
400 * more than one port per device.
402 * Returns the new hardware interface structure, or NULL on a failure
405 static ide_hwif_t *ide_hwif_configure(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *mate, int port, int irq)
407 unsigned long ctl = 0, base = 0;
410 if ((d->flags & IDEPCI_FLAG_ISA_PORTS) == 0) {
411 /* Possibly we should fail if these checks report true */
412 ide_pci_check_iomem(dev, d, 2*port);
413 ide_pci_check_iomem(dev, d, 2*port+1);
415 ctl = pci_resource_start(dev, 2*port+1);
416 base = pci_resource_start(dev, 2*port);
417 if ((ctl && !base) || (base && !ctl)) {
418 printk(KERN_ERR "%s: inconsistent baseregs (BIOS) "
419 "for port %d, skipping\n", d->name, port);
425 /* Use default values */
426 ctl = port ? 0x374 : 0x3f4;
427 base = port ? 0x170 : 0x1f0;
429 if ((hwif = ide_match_hwif(base, d->bootable, d->name)) == NULL)
430 return NULL; /* no room in ide_hwifs[] */
431 if (hwif->io_ports[IDE_DATA_OFFSET] != base ||
432 hwif->io_ports[IDE_CONTROL_OFFSET] != (ctl | 2)) {
433 memset(&hwif->hw, 0, sizeof(hwif->hw));
434 #ifndef IDE_ARCH_OBSOLETE_INIT
435 ide_std_init_ports(&hwif->hw, base, (ctl | 2));
436 hwif->hw.io_ports[IDE_IRQ_OFFSET] = 0;
438 ide_init_hwif_ports(&hwif->hw, base, (ctl | 2), NULL);
440 memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
441 hwif->noprobe = !hwif->io_ports[IDE_DATA_OFFSET];
443 hwif->chipset = ide_pci;
445 hwif->cds = (struct ide_pci_device_s *) d;
446 hwif->channel = port;
458 * ide_hwif_setup_dma - configure DMA interface
461 * @hwif: Hardware interface we are configuring
463 * Set up the DMA base for the interface. Enable the master bits as
464 * necessary and attempt to bring the device DMA into a ready to use
468 #ifndef CONFIG_BLK_DEV_IDEDMA_PCI
469 static void ide_hwif_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
473 static void ide_hwif_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
476 pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
478 if ((d->autodma == AUTODMA) ||
479 ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
480 (dev->class & 0x80))) {
481 unsigned long dma_base = ide_get_or_set_dma_base(hwif);
482 if (dma_base && !(pcicmd & PCI_COMMAND_MASTER)) {
484 * Set up BM-DMA capability
485 * (PnP BIOS should have done this)
487 /* default DMA off if we had to configure it here */
490 if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) || !(pcicmd & PCI_COMMAND_MASTER)) {
491 printk(KERN_ERR "%s: %s error updating PCICMD\n",
492 hwif->name, d->name);
498 d->init_dma(hwif, dma_base);
500 ide_setup_dma(hwif, dma_base, 8);
503 printk(KERN_INFO "%s: %s Bus-Master DMA disabled "
504 "(BIOS)\n", hwif->name, d->name);
508 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI*/
511 * ide_setup_pci_controller - set up IDE PCI
514 * @noisy: verbose flag
515 * @config: returned as 1 if we configured the hardware
517 * Set up the PCI and controller side of the IDE interface. This brings
518 * up the PCI side of the device, checks that the device is enabled
519 * and enables it if need be
522 static int ide_setup_pci_controller(struct pci_dev *dev, ide_pci_device_t *d, int noisy, int *config)
529 ide_setup_pci_noise(dev, d);
531 ret = ide_pci_enable(dev, d);
535 ret = pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
537 printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
540 if (!(pcicmd & PCI_COMMAND_IO)) { /* is device disabled? */
541 ret = ide_pci_configure(dev, d);
545 printk(KERN_INFO "%s: device enabled (Linux)\n", d->name);
548 pci_read_config_dword(dev, PCI_CLASS_REVISION, &class_rev);
551 printk(KERN_INFO "%s: chipset revision %d\n", d->name, class_rev);
557 * ide_pci_setup_ports - configure ports/devices on PCI IDE
559 * @d: IDE pci device info
561 * @index: ata index to update
563 * Scan the interfaces attached to this device and do any
564 * necessary per port setup. Attach the devices and ask the
565 * generic DMA layer to do its work for us.
567 * Normally called automaticall from do_ide_pci_setup_device,
568 * but is also used directly as a helper function by some controllers
569 * where the chipset setup is not the default PCI IDE one.
572 void ide_pci_setup_ports(struct pci_dev *dev, ide_pci_device_t *d, int pciirq, ata_index_t *index)
575 int at_least_one_hwif_enabled = 0;
576 ide_hwif_t *hwif, *mate = NULL;
582 * Set up the IDE ports
585 for (port = 0; port <= 1; ++port) {
586 ide_pci_enablebit_t *e = &(d->enablebits[port]);
588 if (e->reg && (pci_read_config_byte(dev, e->reg, &tmp) ||
589 (tmp & e->mask) != e->val))
590 continue; /* port not enabled */
592 if (d->channels <= port)
595 if ((hwif = ide_hwif_configure(dev, d, mate, port, pciirq)) == NULL)
598 /* setup proper ancestral information */
599 hwif->gendev.parent = &dev->dev;
602 index->b.high = hwif->index;
604 index->b.low = hwif->index;
611 if (d->autodma == NODMA)
612 goto bypass_legacy_dma;
614 if(d->init_setup_dma)
615 d->init_setup_dma(dev, d, hwif);
617 ide_hwif_setup_dma(dev, d, hwif);
620 /* Call chipset-specific routine
621 * for each enabled hwif
626 at_least_one_hwif_enabled = 1;
628 if (!at_least_one_hwif_enabled)
629 printk(KERN_INFO "%s: neither IDE port enabled (BIOS)\n", d->name);
632 EXPORT_SYMBOL_GPL(ide_pci_setup_ports);
635 * ide_setup_pci_device() looks at the primary/secondary interfaces
636 * on a PCI IDE device and, if they are enabled, prepares the IDE driver
637 * for use with them. This generic code works for most PCI chipsets.
639 * One thing that is not standardized is the location of the
640 * primary/secondary interface "enable/disable" bits. For chipsets that
641 * we "know" about, this information is in the ide_pci_device_t struct;
642 * for all other chipsets, we just assume both interfaces are enabled.
644 static int do_ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t *d,
645 ata_index_t *index, u8 noisy)
647 static ata_index_t ata_index = { .b = { .low = 0xff, .high = 0xff } };
648 int tried_config = 0;
651 ret = ide_setup_pci_controller(dev, d, noisy, &tried_config);
656 * Can we trust the reported IRQ?
660 /* Is it an "IDE storage" device in non-PCI mode? */
661 if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE && (dev->class & 5) != 5) {
663 printk(KERN_INFO "%s: not 100%% native mode: "
664 "will probe irqs later\n", d->name);
666 * This allows offboard ide-pci cards the enable a BIOS,
667 * verify interrupt settings of split-mirror pci-config
668 * space, place chipset into init-mode, and/or preserve
669 * an interrupt if the card is not native ide support.
671 ret = d->init_chipset ? d->init_chipset(dev, d->name) : 0;
675 } else if (tried_config) {
677 printk(KERN_INFO "%s: will probe irqs later\n", d->name);
679 } else if (!pciirq) {
681 printk(KERN_WARNING "%s: bad irq (%d): will probe later\n",
685 if (d->init_chipset) {
686 ret = d->init_chipset(dev, d->name);
691 printk(KERN_INFO "%s: 100%% native mode on irq %d\n",
695 /* FIXME: silent failure can happen */
698 ide_pci_setup_ports(dev, d, pciirq, index);
703 int ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t *d)
705 ide_hwif_t *hwif = NULL, *mate = NULL;
706 ata_index_t index_list;
709 ret = do_ide_setup_pci_device(dev, d, &index_list, 1);
713 if ((index_list.b.low & 0xf0) != 0xf0)
714 hwif = &ide_hwifs[index_list.b.low];
715 if ((index_list.b.high & 0xf0) != 0xf0)
716 mate = &ide_hwifs[index_list.b.high];
719 probe_hwif_init_with_fixup(hwif, d->fixup);
721 probe_hwif_init_with_fixup(mate, d->fixup);
724 ide_proc_register_port(hwif);
726 ide_proc_register_port(mate);
731 EXPORT_SYMBOL_GPL(ide_setup_pci_device);
733 int ide_setup_pci_devices(struct pci_dev *dev1, struct pci_dev *dev2,
736 struct pci_dev *pdev[] = { dev1, dev2 };
737 ata_index_t index_list[2];
740 for (i = 0; i < 2; i++) {
741 ret = do_ide_setup_pci_device(pdev[i], d, index_list + i, !i);
743 * FIXME: Mom, mom, they stole me the helper function to undo
744 * do_ide_setup_pci_device() on the first device!
750 for (i = 0; i < 2; i++) {
751 u8 idx[2] = { index_list[i].b.low, index_list[i].b.high };
754 for (j = 0; j < 2; j++) {
755 if ((idx[j] & 0xf0) != 0xf0)
756 probe_hwif_init(ide_hwifs + idx[j]);
760 for (i = 0; i < 2; i++) {
761 u8 idx[2] = { index_list[i].b.low, index_list[i].b.high };
764 for (j = 0; j < 2; j++) {
765 if ((idx[j] & 0xf0) != 0xf0)
766 ide_proc_register_port(ide_hwifs + idx[j]);
773 EXPORT_SYMBOL_GPL(ide_setup_pci_devices);
775 #ifdef CONFIG_IDEPCI_PCIBUS_ORDER
780 static int pre_init = 1; /* Before first ordered IDE scan */
781 static LIST_HEAD(ide_pci_drivers);
784 * __ide_pci_register_driver - attach IDE driver
785 * @driver: pci driver
786 * @module: owner module of the driver
788 * Registers a driver with the IDE layer. The IDE layer arranges that
789 * boot time setup is done in the expected device order and then
790 * hands the controllers off to the core PCI code to do the rest of
793 * The driver_data of the driver table must point to an ide_pci_device_t
794 * describing the interface.
796 * Returns are the same as for pci_register_driver
799 int __ide_pci_register_driver(struct pci_driver *driver, struct module *module,
800 const char *mod_name)
803 return __pci_register_driver(driver, module, mod_name);
804 driver->driver.owner = module;
805 list_add_tail(&driver->node, &ide_pci_drivers);
809 EXPORT_SYMBOL_GPL(__ide_pci_register_driver);
812 * ide_scan_pcidev - find an IDE driver for a device
813 * @dev: PCI device to check
815 * Look for an IDE driver to handle the device we are considering.
816 * This is only used during boot up to get the ordering correct. After
817 * boot up the pci layer takes over the job.
820 static int __init ide_scan_pcidev(struct pci_dev *dev)
823 struct pci_driver *d;
825 list_for_each(l, &ide_pci_drivers)
827 d = list_entry(l, struct pci_driver, node);
830 const struct pci_device_id *id = pci_match_id(d->id_table, dev);
833 if(d->probe(dev, id) >= 0)
845 * ide_scan_pcibus - perform the initial IDE driver scan
846 * @scan_direction: set for reverse order scanning
848 * Perform the initial bus rather than driver ordered scan of the
849 * PCI drivers. After this all IDE pci handling becomes standard
850 * module ordering not traditionally ordered.
853 void __init ide_scan_pcibus (int scan_direction)
855 struct pci_dev *dev = NULL;
856 struct pci_driver *d;
857 struct list_head *l, *n;
860 if (!scan_direction) {
861 while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
862 ide_scan_pcidev(dev);
865 while ((dev = pci_get_device_reverse(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
866 ide_scan_pcidev(dev);
871 * Hand the drivers over to the PCI layer now we
875 list_for_each_safe(l, n, &ide_pci_drivers)
878 d = list_entry(l, struct pci_driver, node);
879 __pci_register_driver(d, d->driver.owner, d->driver.mod_name);