xref: /kernel/linux/linux-5.10/drivers/ide/ide-scan-pci.c

/*
 * support for probing IDE PCI devices in the PCI bus order
 *
 * 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
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/ide.h>

/*
 *	Module interfaces
 */

static int pre_init = 1;		/* Before first ordered IDE scan */
static LIST_HEAD(ide_pci_drivers);

/*
 *	__ide_pci_register_driver	-	attach IDE driver
 *	@driver: pci driver
 *	@module: owner module of the 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.
 *
 *	Returns are the same as for pci_register_driver
 */

int __ide_pci_register_driver(struct pci_driver *driver, struct module *module,
			      const char *mod_name)
{
	if (!pre_init)
		return __pci_register_driver(driver, module, mod_name);
	driver->driver.owner = module;
	list_add_tail(&driver->node, &ide_pci_drivers);
	return 0;
}
EXPORT_SYMBOL_GPL(__ide_pci_register_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;
	int ret;

	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_id(d->id_table, dev);

			if (id != NULL) {
				pci_assign_irq(dev);
				ret = d->probe(dev, id);
				if (ret >= 0) {
					dev->driver = d;
					pci_dev_get(dev);
					return 1;
				}
			}
		}
	}
	return 0;
}

/**
 *	ide_scan_pcibus		-	perform the initial IDE driver scan
 *
 *	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.
 */

static int __init ide_scan_pcibus(void)
{
	struct pci_dev *dev = NULL;
	struct pci_driver *d, *tmp;

	pre_init = 0;
	for_each_pci_dev(dev)
		ide_scan_pcidev(dev);

	/*
	 *	Hand the drivers over to the PCI layer now we
	 *	are post init.
	 */

	list_for_each_entry_safe(d, tmp, &ide_pci_drivers, node) {
		list_del(&d->node);
		if (__pci_register_driver(d, d->driver.owner,
					  d->driver.mod_name))
			printk(KERN_ERR "%s: failed to register %s driver\n",
					__func__, d->driver.mod_name);
	}

	return 0;
}
device_initcall(ide_scan_pcibus);