macio_asic.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 637 行 · 第 1/2 页

/*
 * Bus & driver management routines for devices within
 * a MacIO ASIC. Interface to new driver model mostly
 * stolen from the PCI version.
 * 
 * TODO:
 * 
 *  - Don't probe below media bay by default, but instead provide
 *    some hooks for media bay to dynamically add/remove it's own
 *    sub-devices.
 */
 
#include <linux/config.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/init.h>
#include <linux/module.h>
#include <asm/machdep.h>
#include <asm/macio.h>
#include <asm/pmac_feature.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>

#undef DEBUG

#define MAX_NODE_NAME_SIZE (BUS_ID_SIZE - 12)

static struct macio_chip      *macio_on_hold;

static int macio_bus_match(struct device *dev, struct device_driver *drv) 
{
	struct macio_dev * macio_dev = to_macio_device(dev);
	struct macio_driver * macio_drv = to_macio_driver(drv);
	const struct of_match * matches = macio_drv->match_table;

	if (!matches) 
		return 0;

	return of_match_device(matches, &macio_dev->ofdev) != NULL;
}

struct macio_dev *macio_dev_get(struct macio_dev *dev)
{
	struct device *tmp;

	if (!dev)
		return NULL;
	tmp = get_device(&dev->ofdev.dev);
	if (tmp)
		return to_macio_device(tmp);
	else
		return NULL;
}

void macio_dev_put(struct macio_dev *dev)
{
	if (dev)
		put_device(&dev->ofdev.dev);
}


static int macio_device_probe(struct device *dev)
{
	int error = -ENODEV;
	struct macio_driver *drv;
	struct macio_dev *macio_dev;
	const struct of_match *match;

	drv = to_macio_driver(dev->driver);
	macio_dev = to_macio_device(dev);

	if (!drv->probe)
		return error;

	macio_dev_get(macio_dev);

	match = of_match_device(drv->match_table, &macio_dev->ofdev);
	if (match)
		error = drv->probe(macio_dev, match);
	if (error)
		macio_dev_put(macio_dev);

	return error;
}

static int macio_device_remove(struct device *dev)
{
	struct macio_dev * macio_dev = to_macio_device(dev);
	struct macio_driver * drv = to_macio_driver(dev->driver);

	if (dev->driver && drv->remove)
		drv->remove(macio_dev);
	macio_dev_put(macio_dev);

	return 0;
}

static void macio_device_shutdown(struct device *dev)
{
	struct macio_dev * macio_dev = to_macio_device(dev);
	struct macio_driver * drv = to_macio_driver(dev->driver);

	if (dev->driver && drv->shutdown)
		drv->shutdown(macio_dev);
}

static int macio_device_suspend(struct device *dev, u32 state)
{
	struct macio_dev * macio_dev = to_macio_device(dev);
	struct macio_driver * drv = to_macio_driver(dev->driver);

	if (dev->driver && drv->suspend)
		return drv->suspend(macio_dev, state);
	return 0;
}

static int macio_device_resume(struct device * dev)
{
	struct macio_dev * macio_dev = to_macio_device(dev);
	struct macio_driver * drv = to_macio_driver(dev->driver);

	if (dev->driver && drv->resume)
		return drv->resume(macio_dev);
	return 0;
}

struct bus_type macio_bus_type = {
       .name	= "macio",
       .match	= macio_bus_match,
       .suspend	= macio_device_suspend,
       .resume	= macio_device_resume,
};

static int __init macio_bus_driver_init(void)
{
	return bus_register(&macio_bus_type);
}

postcore_initcall(macio_bus_driver_init);


/**
 * macio_release_dev - free a macio device structure when all users of it are finished.
 * @dev: device that's been disconnected
 *
 * Will be called only by the device core when all users of this macio device are
 * done. This currently means never as we don't hot remove any macio device yet,
 * though that will happen with mediabay based devices in a later implementation.
 */
static void macio_release_dev(struct device *dev)
{
	struct macio_dev *mdev;

        mdev = to_macio_device(dev);
	kfree(mdev);
}

/**
 * macio_resource_quirks - tweak or skip some resources for a device
 * @np: pointer to the device node
 * @res: resulting resource
 * @index: index of resource in node
 *
 * If this routine returns non-null, then the resource is completely
 * skipped.
 */
static int macio_resource_quirks(struct device_node *np, struct resource *res, int index)
{
	if (res->flags & IORESOURCE_MEM) {
		/* Grand Central has too large resource 0 on some machines */
		if (index == 0 && !strcmp(np->name, "gc")) {
			np->addrs[0].size = 0x20000;
			res->end = res->start + 0x1ffff;
		}
		/* Airport has bogus resource 2 */
		if (index >= 2 && !strcmp(np->name, "radio"))
			return 1;
		/* DBDMAs may have bogus sizes */
		if ((res->start & 0x0001f000) == 0x00008000) {
			np->addrs[index].size = 0x100;
			res->end = res->start + 0xff;
		}
		/* ESCC parent eats child resources. We could have added a level of hierarchy,
		 * but I don't really feel the need for it */
		if (!strcmp(np->name, "escc"))
			return 1;
		/* ESCC has bogus resources >= 3 */
		if (index >= 3 && !(strcmp(np->name, "ch-a") && strcmp(np->name, "ch-b")))
			return 1;
		/* Media bay has too many resources, keep only first one */
		if (index > 0 && !strcmp(np->name, "media-bay"))
			return 1;
		/* Some older IDE resources have bogus sizes */
		if (!(strcmp(np->name, "IDE") && strcmp(np->name, "ATA") &&
		      strcmp(np->type, "ide") && strcmp(np->type, "ata"))) {
			if (index == 0 && np->addrs[0].size > 0x1000) {
				np->addrs[0].size = 0x1000;
				res->end = res->start + 0xfff;
			}
			if (index == 1 && np->addrs[1].size > 0x100) {
				np->addrs[1].size = 0x100;
				res->end = res->start + 0xff;
			}
		}
	}
	return 0;
}


/**
 * macio_add_one_device - Add one device from OF node to the device tree
 * @chip: pointer to the macio_chip holding the device
 * @np: pointer to the device node in the OF tree
 * @in_bay: set to 1 if device is part of a media-bay
 *
 * When media-bay is changed to hotswap drivers, this function will
 * be exposed to the bay driver some way...
 */
static struct macio_dev * macio_add_one_device(struct macio_chip *chip, struct device *parent,
					       struct device_node *np, struct macio_dev *in_bay,
					       struct resource *parent_res)
{
	struct macio_dev *dev;
	int i, j;
	u32 *reg;
	
	if (np == NULL)
		return NULL;

	dev = kmalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return NULL;
	memset(dev, 0, sizeof(*dev));

	dev->bus = &chip->lbus;
	dev->media_bay = in_bay;
	dev->ofdev.node = np;
	dev->ofdev.dma_mask = 0xffffffffUL;
	dev->ofdev.dev.dma_mask = &dev->ofdev.dma_mask;
	dev->ofdev.dev.parent = parent;
	dev->ofdev.dev.bus = &macio_bus_type;
	dev->ofdev.dev.release = macio_release_dev;

#ifdef DEBUG
	printk("preparing mdev @%p, ofdev @%p, dev @%p, kobj @%p\n",
	       dev, &dev->ofdev, &dev->ofdev.dev, &dev->ofdev.dev.kobj);
#endif

	/* MacIO itself has a different reg, we use it's PCI base */
	if (np == chip->of_node) {
		sprintf(dev->ofdev.dev.bus_id, "%1d.%08lx:%.*s", chip->lbus.index,
#ifdef CONFIG_PCI
			pci_resource_start(chip->lbus.pdev, 0),
#else
			0, /* NuBus may want to do something better here */
#endif
			MAX_NODE_NAME_SIZE, np->name);
	} else {
		reg = (u32 *)get_property(np, "reg", NULL);
		sprintf(dev->ofdev.dev.bus_id, "%1d.%08x:%.*s", chip->lbus.index,
			reg ? *reg : 0, MAX_NODE_NAME_SIZE, np->name);
	}

	/* For now, we use pre-parsed entries in the device-tree for
	 * interrupt routing and addresses, but we should change that
	 * to dynamically parsed entries and so get rid of most of the
	 * clutter in struct device_node
	 */
	for (i = j = 0; i < np->n_intrs; i++) {
		struct resource *res = &dev->interrupt[j];

		if (j >= MACIO_DEV_COUNT_IRQS)
			break;
		res->start = np->intrs[i].line;
		res->flags = IORESOURCE_IO;
		if (np->intrs[j].sense)
			res->flags |= IORESOURCE_IRQ_LOWLEVEL;
		else
			res->flags |= IORESOURCE_IRQ_HIGHEDGE;
		res->name = dev->ofdev.dev.bus_id;
		if (macio_resource_quirks(np, res, i))
			memset(res, 0, sizeof(struct resource));
		else
			j++;
	}
	dev->n_interrupts = j;
	for (i = j = 0; i < np->n_addrs; i++) {
		struct resource *res = &dev->resource[j];
		
		if (j >= MACIO_DEV_COUNT_RESOURCES)
			break;
		res->start = np->addrs[i].address;
		res->end = np->addrs[i].address + np->addrs[i].size - 1;
		res->flags = IORESOURCE_MEM;
		res->name = dev->ofdev.dev.bus_id;
		if (macio_resource_quirks(np, res, i))
			memset(res, 0, sizeof(struct resource));
		else {
			j++;
			/* Currently, we consider failure as harmless, this may
			 * change in the future, once I've found all the device
			 * tree bugs in older machines & worked around them
			 */
			if (insert_resource(parent_res, res))
       				printk(KERN_WARNING "Can't request resource %d for MacIO"
				       " device %s\n", i, dev->ofdev.dev.bus_id);
		}
	}
	dev->n_resources = j;

	if (of_device_register(&dev->ofdev) != 0) {
		printk(KERN_DEBUG"macio: device registration error for %s!\n",
		       dev->ofdev.dev.bus_id);
		kfree(dev);
		return NULL;
	}