prom_parse.c

来自「linux 内核源代码」· C语言 代码 · 共 1,070 行 · 第 1/2 页

			break;
		}

		DBG("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
		    pbus->name, pna, pns, parent->full_name);

		/* Apply bus translation */
		if (of_translate_one(dev, bus, pbus, addr, na, ns, pna))
			break;

		/* Complete the move up one level */
		na = pna;
		ns = pns;
		bus = pbus;

		of_dump_addr("OF: one level translation:", addr, na);
	}
 bail:
	of_node_put(parent);
	of_node_put(dev);

	return result;
}
EXPORT_SYMBOL(of_translate_address);

const u32 *of_get_address(struct device_node *dev, int index, u64 *size,
		    unsigned int *flags)
{
	const u32 *prop;
	unsigned int psize;
	struct device_node *parent;
	struct of_bus *bus;
	int onesize, i, na, ns;

	/* Get parent & match bus type */
	parent = of_get_parent(dev);
	if (parent == NULL)
		return NULL;
	bus = of_match_bus(parent);
	bus->count_cells(dev, &na, &ns);
	of_node_put(parent);
	if (!OF_CHECK_COUNTS(na, ns))
		return NULL;

	/* Get "reg" or "assigned-addresses" property */
	prop = of_get_property(dev, bus->addresses, &psize);
	if (prop == NULL)
		return NULL;
	psize /= 4;

	onesize = na + ns;
	for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
		if (i == index) {
			if (size)
				*size = of_read_number(prop + na, ns);
			if (flags)
				*flags = bus->get_flags(prop);
			return prop;
		}
	return NULL;
}
EXPORT_SYMBOL(of_get_address);

static int __of_address_to_resource(struct device_node *dev, const u32 *addrp,
				    u64 size, unsigned int flags,
				    struct resource *r)
{
	u64 taddr;

	if ((flags & (IORESOURCE_IO | IORESOURCE_MEM)) == 0)
		return -EINVAL;
	taddr = of_translate_address(dev, addrp);
	if (taddr == OF_BAD_ADDR)
		return -EINVAL;
	memset(r, 0, sizeof(struct resource));
	if (flags & IORESOURCE_IO) {
		unsigned long port;
		port = pci_address_to_pio(taddr);
		if (port == (unsigned long)-1)
			return -EINVAL;
		r->start = port;
		r->end = port + size - 1;
	} else {
		r->start = taddr;
		r->end = taddr + size - 1;
	}
	r->flags = flags;
	r->name = dev->name;
	return 0;
}

int of_address_to_resource(struct device_node *dev, int index,
			   struct resource *r)
{
	const u32	*addrp;
	u64		size;
	unsigned int	flags;

	addrp = of_get_address(dev, index, &size, &flags);
	if (addrp == NULL)
		return -EINVAL;
	return __of_address_to_resource(dev, addrp, size, flags, r);
}
EXPORT_SYMBOL_GPL(of_address_to_resource);

void of_parse_dma_window(struct device_node *dn, const void *dma_window_prop,
		unsigned long *busno, unsigned long *phys, unsigned long *size)
{
	const u32 *dma_window;
	u32 cells;
	const unsigned char *prop;

	dma_window = dma_window_prop;

	/* busno is always one cell */
	*busno = *(dma_window++);

	prop = of_get_property(dn, "ibm,#dma-address-cells", NULL);
	if (!prop)
		prop = of_get_property(dn, "#address-cells", NULL);

	cells = prop ? *(u32 *)prop : of_n_addr_cells(dn);
	*phys = of_read_number(dma_window, cells);

	dma_window += cells;

	prop = of_get_property(dn, "ibm,#dma-size-cells", NULL);
	cells = prop ? *(u32 *)prop : of_n_size_cells(dn);
	*size = of_read_number(dma_window, cells);
}

/*
 * Interrupt remapper
 */

static unsigned int of_irq_workarounds;
static struct device_node *of_irq_dflt_pic;

static struct device_node *of_irq_find_parent(struct device_node *child)
{
	struct device_node *p;
	const phandle *parp;

	if (!of_node_get(child))
		return NULL;

	do {
		parp = of_get_property(child, "interrupt-parent", NULL);
		if (parp == NULL)
			p = of_get_parent(child);
		else {
			if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
				p = of_node_get(of_irq_dflt_pic);
			else
				p = of_find_node_by_phandle(*parp);
		}
		of_node_put(child);
		child = p;
	} while (p && of_get_property(p, "#interrupt-cells", NULL) == NULL);

	return p;
}

/* This doesn't need to be called if you don't have any special workaround
 * flags to pass
 */
void of_irq_map_init(unsigned int flags)
{
	of_irq_workarounds = flags;

	/* OldWorld, don't bother looking at other things */
	if (flags & OF_IMAP_OLDWORLD_MAC)
		return;

	/* If we don't have phandles, let's try to locate a default interrupt
	 * controller (happens when booting with BootX). We do a first match
	 * here, hopefully, that only ever happens on machines with one
	 * controller.
	 */
	if (flags & OF_IMAP_NO_PHANDLE) {
		struct device_node *np;

		for(np = NULL; (np = of_find_all_nodes(np)) != NULL;) {
			if (of_get_property(np, "interrupt-controller", NULL)
			    == NULL)
				continue;
			/* Skip /chosen/interrupt-controller */
			if (strcmp(np->name, "chosen") == 0)
				continue;
			/* It seems like at least one person on this planet wants
			 * to use BootX on a machine with an AppleKiwi controller
			 * which happens to pretend to be an interrupt
			 * controller too.
			 */
			if (strcmp(np->name, "AppleKiwi") == 0)
				continue;
			/* I think we found one ! */
			of_irq_dflt_pic = np;
			break;
		}
	}

}

int of_irq_map_raw(struct device_node *parent, const u32 *intspec, u32 ointsize,
		const u32 *addr, struct of_irq *out_irq)
{
	struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;
	const u32 *tmp, *imap, *imask;
	u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;
	int imaplen, match, i;

	DBG("of_irq_map_raw: par=%s,intspec=[0x%08x 0x%08x...],ointsize=%d\n",
	    parent->full_name, intspec[0], intspec[1], ointsize);

	ipar = of_node_get(parent);

	/* First get the #interrupt-cells property of the current cursor
	 * that tells us how to interpret the passed-in intspec. If there
	 * is none, we are nice and just walk up the tree
	 */
	do {
		tmp = of_get_property(ipar, "#interrupt-cells", NULL);
		if (tmp != NULL) {
			intsize = *tmp;
			break;
		}
		tnode = ipar;
		ipar = of_irq_find_parent(ipar);
		of_node_put(tnode);
	} while (ipar);
	if (ipar == NULL) {
		DBG(" -> no parent found !\n");
		goto fail;
	}

	DBG("of_irq_map_raw: ipar=%s, size=%d\n", ipar->full_name, intsize);

	if (ointsize != intsize)
		return -EINVAL;

	/* Look for this #address-cells. We have to implement the old linux
	 * trick of looking for the parent here as some device-trees rely on it
	 */
	old = of_node_get(ipar);
	do {
		tmp = of_get_property(old, "#address-cells", NULL);
		tnode = of_get_parent(old);
		of_node_put(old);
		old = tnode;
	} while(old && tmp == NULL);
	of_node_put(old);
	old = NULL;
	addrsize = (tmp == NULL) ? 2 : *tmp;

	DBG(" -> addrsize=%d\n", addrsize);

	/* Now start the actual "proper" walk of the interrupt tree */
	while (ipar != NULL) {
		/* Now check if cursor is an interrupt-controller and if it is
		 * then we are done
		 */
		if (of_get_property(ipar, "interrupt-controller", NULL) !=
				NULL) {
			DBG(" -> got it !\n");
			memcpy(out_irq->specifier, intspec,
			       intsize * sizeof(u32));
			out_irq->size = intsize;
			out_irq->controller = ipar;
			of_node_put(old);
			return 0;
		}

		/* Now look for an interrupt-map */
		imap = of_get_property(ipar, "interrupt-map", &imaplen);
		/* No interrupt map, check for an interrupt parent */
		if (imap == NULL) {
			DBG(" -> no map, getting parent\n");
			newpar = of_irq_find_parent(ipar);
			goto skiplevel;
		}
		imaplen /= sizeof(u32);

		/* Look for a mask */
		imask = of_get_property(ipar, "interrupt-map-mask", NULL);

		/* If we were passed no "reg" property and we attempt to parse
		 * an interrupt-map, then #address-cells must be 0.
		 * Fail if it's not.
		 */
		if (addr == NULL && addrsize != 0) {
			DBG(" -> no reg passed in when needed !\n");
			goto fail;
		}

		/* Parse interrupt-map */
		match = 0;
		while (imaplen > (addrsize + intsize + 1) && !match) {
			/* Compare specifiers */
			match = 1;
			for (i = 0; i < addrsize && match; ++i) {
				u32 mask = imask ? imask[i] : 0xffffffffu;
				match = ((addr[i] ^ imap[i]) & mask) == 0;
			}
			for (; i < (addrsize + intsize) && match; ++i) {
				u32 mask = imask ? imask[i] : 0xffffffffu;
				match =
				   ((intspec[i-addrsize] ^ imap[i]) & mask) == 0;
			}
			imap += addrsize + intsize;
			imaplen -= addrsize + intsize;

			DBG(" -> match=%d (imaplen=%d)\n", match, imaplen);

			/* Get the interrupt parent */
			if (of_irq_workarounds & OF_IMAP_NO_PHANDLE)
				newpar = of_node_get(of_irq_dflt_pic);
			else
				newpar = of_find_node_by_phandle((phandle)*imap);
			imap++;
			--imaplen;

			/* Check if not found */
			if (newpar == NULL) {
				DBG(" -> imap parent not found !\n");
				goto fail;
			}

			/* Get #interrupt-cells and #address-cells of new
			 * parent
			 */
			tmp = of_get_property(newpar, "#interrupt-cells", NULL);
			if (tmp == NULL) {
				DBG(" -> parent lacks #interrupt-cells !\n");
				goto fail;
			}
			newintsize = *tmp;
			tmp = of_get_property(newpar, "#address-cells", NULL);
			newaddrsize = (tmp == NULL) ? 0 : *tmp;

			DBG(" -> newintsize=%d, newaddrsize=%d\n",
			    newintsize, newaddrsize);

			/* Check for malformed properties */
			if (imaplen < (newaddrsize + newintsize))
				goto fail;

			imap += newaddrsize + newintsize;
			imaplen -= newaddrsize + newintsize;

			DBG(" -> imaplen=%d\n", imaplen);
		}
		if (!match)
			goto fail;

		of_node_put(old);
		old = of_node_get(newpar);
		addrsize = newaddrsize;
		intsize = newintsize;
		intspec = imap - intsize;
		addr = intspec - addrsize;

	skiplevel:
		/* Iterate again with new parent */
		DBG(" -> new parent: %s\n", newpar ? newpar->full_name : "<>");
		of_node_put(ipar);
		ipar = newpar;
		newpar = NULL;
	}
 fail:
	of_node_put(ipar);
	of_node_put(old);
	of_node_put(newpar);

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(of_irq_map_raw);

#if defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)
static int of_irq_map_oldworld(struct device_node *device, int index,
			       struct of_irq *out_irq)
{
	const u32 *ints = NULL;
	int intlen;

	/*
	 * Old machines just have a list of interrupt numbers
	 * and no interrupt-controller nodes. We also have dodgy
	 * cases where the APPL,interrupts property is completely
	 * missing behind pci-pci bridges and we have to get it
	 * from the parent (the bridge itself, as apple just wired
	 * everything together on these)
	 */
	while (device) {
		ints = of_get_property(device, "AAPL,interrupts", &intlen);
		if (ints != NULL)
			break;
		device = device->parent;
		if (device && strcmp(device->type, "pci") != 0)
			break;
	}
	if (ints == NULL)
		return -EINVAL;
	intlen /= sizeof(u32);

	if (index >= intlen)
		return -EINVAL;

	out_irq->controller = NULL;
	out_irq->specifier[0] = ints[index];
	out_irq->size = 1;

	return 0;
}
#else /* defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32) */
static int of_irq_map_oldworld(struct device_node *device, int index,
			       struct of_irq *out_irq)
{
	return -EINVAL;
}
#endif /* !(defined(CONFIG_PPC_PMAC) && defined(CONFIG_PPC32)) */

int of_irq_map_one(struct device_node *device, int index, struct of_irq *out_irq)
{
	struct device_node *p;
	const u32 *intspec, *tmp, *addr;
	u32 intsize, intlen;
	int res;

	DBG("of_irq_map_one: dev=%s, index=%d\n", device->full_name, index);

	/* OldWorld mac stuff is "special", handle out of line */
	if (of_irq_workarounds & OF_IMAP_OLDWORLD_MAC)
		return of_irq_map_oldworld(device, index, out_irq);

	/* Get the interrupts property */
	intspec = of_get_property(device, "interrupts", &intlen);
	if (intspec == NULL)
		return -EINVAL;
	intlen /= sizeof(u32);

	/* Get the reg property (if any) */
	addr = of_get_property(device, "reg", NULL);

	/* Look for the interrupt parent. */
	p = of_irq_find_parent(device);
	if (p == NULL)
		return -EINVAL;

	/* Get size of interrupt specifier */
	tmp = of_get_property(p, "#interrupt-cells", NULL);
	if (tmp == NULL) {
		of_node_put(p);
		return -EINVAL;
	}
	intsize = *tmp;

	DBG(" intsize=%d intlen=%d\n", intsize, intlen);

	/* Check index */
	if ((index + 1) * intsize > intlen)
		return -EINVAL;

	/* Get new specifier and map it */
	res = of_irq_map_raw(p, intspec + index * intsize, intsize,
			     addr, out_irq);
	of_node_put(p);
	return res;
}
EXPORT_SYMBOL_GPL(of_irq_map_one);

/**
 * Search the device tree for the best MAC address to use.  'mac-address' is
 * checked first, because that is supposed to contain to "most recent" MAC
 * address. If that isn't set, then 'local-mac-address' is checked next,
 * because that is the default address.  If that isn't set, then the obsolete
 * 'address' is checked, just in case we're using an old device tree.
 *
 * Note that the 'address' property is supposed to contain a virtual address of
 * the register set, but some DTS files have redefined that property to be the
 * MAC address.
 *
 * All-zero MAC addresses are rejected, because those could be properties that
 * exist in the device tree, but were not set by U-Boot.  For example, the
 * DTS could define 'mac-address' and 'local-mac-address', with zero MAC
 * addresses.  Some older U-Boots only initialized 'local-mac-address'.  In
 * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
 * but is all zeros.
*/
const void *of_get_mac_address(struct device_node *np)
{
	struct property *pp;

	pp = of_find_property(np, "mac-address", NULL);
	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
		return pp->value;

	pp = of_find_property(np, "local-mac-address", NULL);
	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
		return pp->value;

	pp = of_find_property(np, "address", NULL);
	if (pp && (pp->length == 6) && is_valid_ether_addr(pp->value))
		return pp->value;

	return NULL;
}
EXPORT_SYMBOL(of_get_mac_address);

int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
{
	int irq = irq_of_parse_and_map(dev, index);

	/* Only dereference the resource if both the
	 * resource and the irq are valid. */
	if (r && irq != NO_IRQ) {
		r->start = r->end = irq;
		r->flags = IORESOURCE_IRQ;
	}

	return irq;
}
EXPORT_SYMBOL_GPL(of_irq_to_resource);

void __iomem *of_iomap(struct device_node *np, int index)
{
	struct resource res;

	if (of_address_to_resource(np, index, &res))
		return NULL;

	return ioremap(res.start, 1 + res.end - res.start);
}
EXPORT_SYMBOL(of_iomap);