ioc3.c

linux 内核源代码

				&& ioc3_submodules[id]->intr) {
			write_ireg(idd, ioc3_submodules[id]->irq_mask,
							IOC3_W_IEC);
			if(!ioc3_submodules[id]->intr(ioc3_submodules[id],
				   idd, pending & ioc3_submodules[id]->irq_mask))
				pending &= ~ioc3_submodules[id]->irq_mask;
			if (ioc3_submodules[id]->reset_mask)
				write_ireg(idd, ioc3_submodules[id]->irq_mask,
							IOC3_W_IES);
		}
	}
	read_unlock_irqrestore(&ioc3_submodules_lock, flags);
	if(pending) {
		printk(KERN_WARNING
		  "IOC3: Pending IRQs 0x%08x discarded and disabled\n",pending);
		write_ireg(idd, pending, IOC3_W_IEC);
		handled = 1;
	}
	return handled?IRQ_HANDLED:IRQ_NONE;
}

static irqreturn_t ioc3_intr_eth(int irq, void *arg)
{
	unsigned long flags;
	struct ioc3_driver_data *idd = (struct ioc3_driver_data *)arg;
	int handled = 1;

	if(!idd->dual_irq)
		return IRQ_NONE;
	read_lock_irqsave(&ioc3_submodules_lock, flags);
	if(ioc3_ethernet && idd->active[ioc3_ethernet->id]
				&& ioc3_ethernet->intr)
		handled = handled && !ioc3_ethernet->intr(ioc3_ethernet, idd, 0);
	read_unlock_irqrestore(&ioc3_submodules_lock, flags);
	return handled?IRQ_HANDLED:IRQ_NONE;
}

void ioc3_enable(struct ioc3_submodule *is,
				struct ioc3_driver_data *idd, unsigned int irqs)
{
	write_ireg(idd, irqs & is->irq_mask, IOC3_W_IES);
}

void ioc3_ack(struct ioc3_submodule *is, struct ioc3_driver_data *idd,
				unsigned int irqs)
{
	writel(irqs & is->irq_mask, &idd->vma->sio_ir);
}

void ioc3_disable(struct ioc3_submodule *is,
				struct ioc3_driver_data *idd, unsigned int irqs)
{
	write_ireg(idd, irqs & is->irq_mask, IOC3_W_IEC);
}

void ioc3_gpcr_set(struct ioc3_driver_data *idd, unsigned int val)
{
	unsigned long flags;
	spin_lock_irqsave(&idd->gpio_lock, flags);
	writel(val, &idd->vma->gpcr_s);
	spin_unlock_irqrestore(&idd->gpio_lock, flags);
}

/* Keep it simple, stupid! */
static int find_slot(void **tab, int max)
{
	int i;
	for(i=0;i<max;i++)
		if(!(tab[i]))
			return i;
	return -1;
}

/* Register an IOC3 submodule */
int ioc3_register_submodule(struct ioc3_submodule *is)
{
	struct ioc3_driver_data *idd;
	int alloc_id;
	unsigned long flags;

	write_lock_irqsave(&ioc3_submodules_lock, flags);
	alloc_id = find_slot((void **)ioc3_submodules, IOC3_MAX_SUBMODULES);
	if(alloc_id != -1) {
		ioc3_submodules[alloc_id] = is;
		if(is->ethernet) {
			if(ioc3_ethernet==NULL)
				ioc3_ethernet=is;
			else
				printk(KERN_WARNING
				  "IOC3 Ethernet module already registered!\n");
		}
	}
	write_unlock_irqrestore(&ioc3_submodules_lock, flags);

	if(alloc_id == -1) {
		printk(KERN_WARNING "Increase IOC3_MAX_SUBMODULES!\n");
		return -ENOMEM;
	}

	is->id=alloc_id;

	/* Initialize submodule for each IOC3 */
	if (!is->probe)
		return 0;

	down_read(&ioc3_devices_rwsem);
	list_for_each_entry(idd, &ioc3_devices, list) {
		/* set to 1 for IRQs in probe */
		idd->active[alloc_id] = 1;
		idd->active[alloc_id] = !is->probe(is, idd);
	}
	up_read(&ioc3_devices_rwsem);

	return 0;
}

/* Unregister an IOC3 submodule */
void ioc3_unregister_submodule(struct ioc3_submodule *is)
{
	struct ioc3_driver_data *idd;
	unsigned long flags;

	write_lock_irqsave(&ioc3_submodules_lock, flags);
	if(ioc3_submodules[is->id]==is)
		ioc3_submodules[is->id]=NULL;
	else
		printk(KERN_WARNING
			"IOC3 submodule %s has wrong ID.\n",is->name);
	if(ioc3_ethernet==is)
		ioc3_ethernet = NULL;
	write_unlock_irqrestore(&ioc3_submodules_lock, flags);

	/* Remove submodule for each IOC3 */
	down_read(&ioc3_devices_rwsem);
	list_for_each_entry(idd, &ioc3_devices, list)
		if(idd->active[is->id]) {
			if(is->remove)
				if(is->remove(is, idd))
					printk(KERN_WARNING
					       "%s: IOC3 submodule %s remove failed "
					       "for pci_dev %s.\n",
					       __FUNCTION__, module_name(is->owner),
					       pci_name(idd->pdev));
			idd->active[is->id] = 0;
			if(is->irq_mask)
				write_ireg(idd, is->irq_mask, IOC3_W_IEC);
		}
	up_read(&ioc3_devices_rwsem);
}

/*********************
 * Device management *
 *********************/

static char *
ioc3_class_names[]={"unknown", "IP27 BaseIO", "IP30 system", "MENET 1/2/3",
			"MENET 4", "CADduo", "Altix Serial"};

static int ioc3_class(struct ioc3_driver_data *idd)
{
	int res = IOC3_CLASS_NONE;
	/* NIC-based logic */
	if(!strncmp(idd->nic_part, "030-0891-", 9))
		res = IOC3_CLASS_BASE_IP30;
	if(!strncmp(idd->nic_part, "030-1155-", 9))
		res = IOC3_CLASS_CADDUO;
	if(!strncmp(idd->nic_part, "030-1657-", 9))
		res = IOC3_CLASS_SERIAL;
	if(!strncmp(idd->nic_part, "030-1664-", 9))
		res = IOC3_CLASS_SERIAL;
	/* total random heuristics */
#ifdef CONFIG_SGI_IP27
	if(!idd->nic_part[0])
		res = IOC3_CLASS_BASE_IP27;
#endif
	/* print educational message */
	printk(KERN_INFO "IOC3 part: [%s], serial: [%s] => class %s\n",
			idd->nic_part, idd->nic_serial, ioc3_class_names[res]);
	return res;
}
/* Adds a new instance of an IOC3 card */
static int ioc3_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
{
	struct ioc3_driver_data *idd;
	uint32_t pcmd;
	int ret, id;

	/* Enable IOC3 and take ownership of it */
	if ((ret = pci_enable_device(pdev))) {
		printk(KERN_WARNING
		       "%s: Failed to enable IOC3 device for pci_dev %s.\n",
		       __FUNCTION__, pci_name(pdev));
		goto out;
	}
	pci_set_master(pdev);

#ifdef USE_64BIT_DMA
        ret = pci_set_dma_mask(pdev, DMA_64BIT_MASK);
        if (!ret) {
                ret = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
                if (ret < 0) {
                        printk(KERN_WARNING "%s: Unable to obtain 64 bit DMA "
                               "for consistent allocations\n",
				__FUNCTION__);
                }
	}
#endif

	/* Set up per-IOC3 data */
	idd = kzalloc(sizeof(struct ioc3_driver_data), GFP_KERNEL);
	if (!idd) {
		printk(KERN_WARNING
		       "%s: Failed to allocate IOC3 data for pci_dev %s.\n",
		       __FUNCTION__, pci_name(pdev));
		ret = -ENODEV;
		goto out_idd;
	}
	spin_lock_init(&idd->ir_lock);
	spin_lock_init(&idd->gpio_lock);
	idd->pdev = pdev;

	/* Map all IOC3 registers.  These are shared between subdevices
	 * so the main IOC3 module manages them.
	 */
	idd->pma = pci_resource_start(pdev, 0);
	if (!idd->pma) {
		printk(KERN_WARNING
		       "%s: Unable to find IOC3 resource "
		       "for pci_dev %s.\n",
		       __FUNCTION__, pci_name(pdev));
		ret = -ENODEV;
		goto out_pci;
	}
	if (!request_mem_region(idd->pma, IOC3_PCI_SIZE, "ioc3")) {
		printk(KERN_WARNING
		       "%s: Unable to request IOC3 region "
		       "for pci_dev %s.\n",
		       __FUNCTION__, pci_name(pdev));
		ret = -ENODEV;
		goto out_pci;
	}
	idd->vma = ioremap(idd->pma, IOC3_PCI_SIZE);
	if (!idd->vma) {
		printk(KERN_WARNING
		       "%s: Unable to remap IOC3 region "
		       "for pci_dev %s.\n",
		       __FUNCTION__, pci_name(pdev));
		ret = -ENODEV;
		goto out_misc_region;
	}

	/* Track PCI-device specific data */
	pci_set_drvdata(pdev, idd);
	down_write(&ioc3_devices_rwsem);
	list_add_tail(&idd->list, &ioc3_devices);
	idd->id = ioc3_counter++;
	up_write(&ioc3_devices_rwsem);

	idd->gpdr_shadow = readl(&idd->vma->gpdr);

	/* Read IOC3 NIC contents */
	probe_nic(idd);

	/* Detect IOC3 class */
	idd->class = ioc3_class(idd);

	/* Initialize IOC3 */
       pci_read_config_dword(pdev, PCI_COMMAND, &pcmd);
       pci_write_config_dword(pdev, PCI_COMMAND,
                               pcmd | PCI_COMMAND_MEMORY |
                               PCI_COMMAND_PARITY | PCI_COMMAND_SERR |
                               PCI_SCR_DROP_MODE_EN);

	write_ireg(idd, ~0, IOC3_W_IEC);
	writel(~0, &idd->vma->sio_ir);

	/* Set up IRQs */
	if(idd->class == IOC3_CLASS_BASE_IP30
				|| idd->class == IOC3_CLASS_BASE_IP27) {
		writel(0, &idd->vma->eier);
		writel(~0, &idd->vma->eisr);

		idd->dual_irq = 1;
		if (!request_irq(pdev->irq, ioc3_intr_eth, IRQF_SHARED,
				 "ioc3-eth", (void *)idd)) {
			idd->irq_eth = pdev->irq;
		} else {
			printk(KERN_WARNING
			       "%s : request_irq fails for IRQ 0x%x\n ",
			       __FUNCTION__, pdev->irq);
		}
		if (!request_irq(pdev->irq+2, ioc3_intr_io, IRQF_SHARED,
				 "ioc3-io", (void *)idd)) {
			idd->irq_io = pdev->irq+2;
		} else {
			printk(KERN_WARNING
			       "%s : request_irq fails for IRQ 0x%x\n ",
			       __FUNCTION__, pdev->irq+2);
		}
	} else {
		if (!request_irq(pdev->irq, ioc3_intr_io, IRQF_SHARED,
				 "ioc3", (void *)idd)) {
			idd->irq_io = pdev->irq;
		} else {
			printk(KERN_WARNING
			       "%s : request_irq fails for IRQ 0x%x\n ",
			       __FUNCTION__, pdev->irq);
		}
	}

	/* Add this IOC3 to all submodules */
	for(id=0;id<IOC3_MAX_SUBMODULES;id++)
		if(ioc3_submodules[id] && ioc3_submodules[id]->probe) {
			idd->active[id] = 1;
			idd->active[id] = !ioc3_submodules[id]->probe
						(ioc3_submodules[id], idd);
		}

	printk(KERN_INFO "IOC3 Master Driver loaded for %s\n", pci_name(pdev));

	return 0;

out_misc_region:
	release_mem_region(idd->pma, IOC3_PCI_SIZE);
out_pci:
	kfree(idd);
out_idd:
	pci_disable_device(pdev);
out:
	return ret;
}

/* Removes a particular instance of an IOC3 card. */
static void ioc3_remove(struct pci_dev *pdev)
{
	int id;
	struct ioc3_driver_data *idd;

	idd = pci_get_drvdata(pdev);

	/* Remove this IOC3 from all submodules */
	for(id=0;id<IOC3_MAX_SUBMODULES;id++)
		if(idd->active[id]) {
			if(ioc3_submodules[id] && ioc3_submodules[id]->remove)
				if(ioc3_submodules[id]->remove(ioc3_submodules[id],
								idd))
					printk(KERN_WARNING
					       "%s: IOC3 submodule 0x%s remove failed "
					       "for pci_dev %s.\n",
					        __FUNCTION__,
						module_name(ioc3_submodules[id]->owner),
					        pci_name(pdev));
			idd->active[id] = 0;
		}

	/* Clear and disable all IRQs */
	write_ireg(idd, ~0, IOC3_W_IEC);
	writel(~0, &idd->vma->sio_ir);

	/* Release resources */
	free_irq(idd->irq_io, (void *)idd);
	if(idd->dual_irq)
		free_irq(idd->irq_eth, (void *)idd);
	iounmap(idd->vma);
	release_mem_region(idd->pma, IOC3_PCI_SIZE);

	/* Disable IOC3 and relinquish */
	pci_disable_device(pdev);

	/* Remove and free driver data */
	down_write(&ioc3_devices_rwsem);
	list_del(&idd->list);
	up_write(&ioc3_devices_rwsem);
	kfree(idd);
}

static struct pci_device_id ioc3_id_table[] = {
	{PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3, PCI_ANY_ID, PCI_ANY_ID},
	{0}
};

static struct pci_driver ioc3_driver = {
	.name = "IOC3",
	.id_table = ioc3_id_table,
	.probe = ioc3_probe,
	.remove = ioc3_remove,
};

MODULE_DEVICE_TABLE(pci, ioc3_id_table);

/*********************
 * Module management *
 *********************/

/* Module load */
static int __devinit ioc3_init(void)
{
	if (ia64_platform_is("sn2"))
		return pci_register_driver(&ioc3_driver);
	return 0;
}

/* Module unload */
static void __devexit ioc3_exit(void)
{
	pci_unregister_driver(&ioc3_driver);
}

module_init(ioc3_init);
module_exit(ioc3_exit);

MODULE_AUTHOR("Stanislaw Skowronek <[e-mail]>");
MODULE_DESCRIPTION("PCI driver for SGI IOC3");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL_GPL(ioc3_register_submodule);
EXPORT_SYMBOL_GPL(ioc3_unregister_submodule);
EXPORT_SYMBOL_GPL(ioc3_ack);
EXPORT_SYMBOL_GPL(ioc3_gpcr_set);
EXPORT_SYMBOL_GPL(ioc3_disable);
EXPORT_SYMBOL_GPL(ioc3_enable);