setup-pci.c

ep9315平台下硬盘驱动的源码

	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);
	}
}