[POWERPC] New device-tree interrupt parsing code

static void of_dump_addr(const char *s, u32 *addr, int na) { }

#endif

/* Read a big address */

static inline u64 of_read_addr(u32 *cell, int size)

{

	u64 r = 0;

	while (size--)

		r = (r << 32) | *(cell++);

	return r;

}

/* Callbacks for bus specific translators */

struct of_bus {

{

	u64 cp, s, da;

	cp = of_read_addr(range, na);

	s  = of_read_addr(range + na + pna, ns);

	da = of_read_addr(addr, na);

	cp = of_read_number(range, na);

	s  = of_read_number(range + na + pna, ns);

	da = of_read_number(addr, na);

	DBG("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",

	    cp, s, da);

static int of_bus_default_translate(u32 *addr, u64 offset, int na)

{

	u64 a = of_read_addr(addr, na);

	u64 a = of_read_number(addr, na);

	memset(addr, 0, na * 4);

	a += offset;

	if (na > 1)

		return OF_BAD_ADDR;

	/* Read address values, skipping high cell */

	cp = of_read_addr(range + 1, na - 1);

	s  = of_read_addr(range + na + pna, ns);

	da = of_read_addr(addr + 1, na - 1);

	cp = of_read_number(range + 1, na - 1);

	s  = of_read_number(range + na + pna, ns);

	da = of_read_number(addr + 1, na - 1);

	DBG("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);

		return OF_BAD_ADDR;

	/* Read address values, skipping high cell */

	cp = of_read_addr(range + 1, na - 1);

	s  = of_read_addr(range + na + pna, ns);

	da = of_read_addr(addr + 1, na - 1);

	cp = of_read_number(range + 1, na - 1);

	s  = of_read_number(range + na + pna, ns);

	da = of_read_number(addr + 1, na - 1);

	DBG("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);

	 */

	ranges = (u32 *)get_property(parent, "ranges", &rlen);

	if (ranges == NULL || rlen == 0) {

		offset = of_read_addr(addr, na);

		offset = of_read_number(addr, na);

		memset(addr, 0, pna * 4);

		DBG("OF: no ranges, 1:1 translation\n");

		goto finish;

		/* If root, we have finished */

		if (parent == NULL) {

			DBG("OF: reached root node\n");

			result = of_read_addr(addr, na);

			result = of_read_number(addr, na);

			break;

		}

	for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)

		if (i == index) {

			if (size)

				*size = of_read_addr(prop + na, ns);

				*size = of_read_number(prop + na, ns);

			if (flags)

				*flags = bus->get_flags(prop);

			return prop;

	for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)

		if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {

			if (size)

				*size = of_read_addr(prop + na, ns);

				*size = of_read_number(prop + na, ns);

			if (flags)

				*flags = bus->get_flags(prop);

			return prop;

		prop = get_property(dn, "#address-cells", NULL);

	cells = prop ? *(u32 *)prop : prom_n_addr_cells(dn);

	*phys = of_read_addr(dma_window, cells);

	*phys = of_read_number(dma_window, cells);

	dma_window += cells;

	prop = get_property(dn, "ibm,#dma-size-cells", NULL);

	cells = prop ? *(u32 *)prop : prom_n_size_cells(dn);

	*size = of_read_addr(dma_window, cells);

	*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;

	phandle *parp;

	if (!of_node_get(child))

		return NULL;

	do {

		parp = (phandle *)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 && get_property(p, "#interrupt-cells", NULL) == NULL);

	return p;

}

static u8 of_irq_pci_swizzle(u8 slot, u8 pin)

{

	return (((pin - 1) + slot) % 4) + 1;

}

/* 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 (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, u32 *intspec, u32 *addr,

		   struct of_irq *out_irq)

{

	struct device_node *ipar, *tnode, *old = NULL, *newpar = NULL;

	u32 *tmp, *imap, *imask;

	u32 intsize = 1, addrsize, newintsize = 0, newaddrsize = 0;

	int imaplen, match, i;

	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 = (u32 *)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);

	/* 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 = (u32 *)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 (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 = (u32 *)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 = (u32 *)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 = (u32 *)get_property(newpar, "#interrupt-cells",

						  NULL);

			if (tmp == NULL) {

				DBG(" -> parent lacks #interrupt-cells !\n");

				goto fail;

			}

			newintsize = *tmp;

			tmp = (u32 *)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)

{

	u32 *ints;

	int intlen;

	/*

	 * Old machines just have a list of interrupt numbers

	 * and no interrupt-controller nodes.

	 */

	ints = (u32 *) get_property(device, "AAPL,interrupts", &intlen);

	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;

	u32 *intspec, *tmp, intsize, intlen, *addr;

	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 = (u32 *)get_property(device, "interrupts", &intlen);

	if (intspec == NULL)

		return -EINVAL;

	intlen /= sizeof(u32);

	/* Get the reg property (if any) */

	addr = (u32 *)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 = (u32 *)get_property(p, "#interrupt-cells", NULL);

	if (tmp == NULL) {

		of_node_put(p);

		return -EINVAL;

	}

	intsize = *tmp;

	/* Check index */

	if (index * intsize >= intlen)

		return -EINVAL;

	/* Get new specifier and map it */

	res = of_irq_map_raw(p, intspec + index * intsize, addr, out_irq);

	of_node_put(p);

	return res;

}

EXPORT_SYMBOL_GPL(of_irq_map_one);

int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq)

{

	struct device_node *dn, *ppnode;

	struct pci_dev *ppdev;

	u32 lspec;

	u32 laddr[3];

	u8 pin;

	int rc;

	/* Check if we have a device node, if yes, fallback to standard OF

	 * parsing

	 */

	dn = pci_device_to_OF_node(pdev);

	if (dn)

		return of_irq_map_one(dn, 0, out_irq);

	/* Ok, we don't, time to have fun. Let's start by building up an

	 * interrupt spec.  we assume #interrupt-cells is 1, which is standard

	 * for PCI. If you do different, then don't use that routine.

	 */

	rc = pci_read_config_byte(pdev, PCI_INTERRUPT_PIN, &pin);

	if (rc != 0)

		return rc;

	/* No pin, exit */

	if (pin == 0)

		return -ENODEV;

	/* Now we walk up the PCI tree */

	lspec = pin;

	for (;;) {

		/* Get the pci_dev of our parent */

		ppdev = pdev->bus->self;

		/* Ouch, it's a host bridge... */

		if (ppdev == NULL) {

#ifdef CONFIG_PPC64

			ppnode = pci_bus_to_OF_node(pdev->bus);

#else

			struct pci_controller *host;

			host = pci_bus_to_host(pdev->bus);

			ppnode = host ? host->arch_data : NULL;

#endif

			/* No node for host bridge ? give up */

			if (ppnode == NULL)

				return -EINVAL;

		} else

			/* We found a P2P bridge, check if it has a node */

			ppnode = pci_device_to_OF_node(ppdev);

		/* Ok, we have found a parent with a device-node, hand over to

		 * the OF parsing code.

		 * We build a unit address from the linux device to be used for

		 * resolution. Note that we use the linux bus number which may

		 * not match your firmware bus numbering.

		 * Fortunately, in most cases, interrupt-map-mask doesn't include

		 * the bus number as part of the matching.

		 * You should still be careful about that though if you intend

		 * to rely on this function (you ship  a firmware that doesn't

		 * create device nodes for all PCI devices).

		 */

		if (ppnode)

			break;

		/* We can only get here if we hit a P2P bridge with no node,

		 * let's do standard swizzling and try again

		 */

		lspec = of_irq_pci_swizzle(PCI_SLOT(pdev->devfn), lspec);

		pdev = ppdev;

	}

	laddr[0] = (pdev->bus->number << 16)

		| (pdev->devfn << 8);

	laddr[1]  = laddr[2] = 0;

	return of_irq_map_raw(ppnode, &lspec, laddr, out_irq);

}

EXPORT_SYMBOL_GPL(of_irq_map_pci);

 */

/* Helper to read a big number */

static inline u64 of_read_number(u32 *cell, int size)

{

	u64 r = 0;

	while (size--)

		r = (r << 32) | *(cell++);

	return r;

}

/* Translate an OF address block into a CPU physical address

 */

#define OF_BAD_ADDR	((u64)-1)

/* CPU OF node matching */

struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);

/*

 * OF interrupt mapping

 */

/* This structure is returned when an interrupt is mapped. The controller

 * field needs to be put() after use

 */

#define OF_MAX_IRQ_SPEC		 4 /* We handle specifiers of at most 4 cells */

struct of_irq {

	struct device_node *controller;	/* Interrupt controller node */

	u32 size;			/* Specifier size */

	u32 specifier[OF_MAX_IRQ_SPEC];	/* Specifier copy */

};

/***

 * of_irq_map_init - Initialize the irq remapper

 * @flags:	flags defining workarounds to enable

 *

 * Some machines have bugs in the device-tree which require certain workarounds

 * to be applied. Call this before any interrupt mapping attempts to enable

 * those workarounds.

 */

#define OF_IMAP_OLDWORLD_MAC	0x00000001

#define OF_IMAP_NO_PHANDLE	0x00000002

extern void of_irq_map_init(unsigned int flags);

/***

 * of_irq_map_raw - Low level interrupt tree parsing

 * @parent:	the device interrupt parent

 * @intspec:	interrupt specifier ("interrupts" property of the device)

 * @addr:	address specifier (start of "reg" property of the device)

 * @out_irq:	structure of_irq filled by this function

 *

 * Returns 0 on success and a negative number on error

 *

 * This function is a low-level interrupt tree walking function. It

 * can be used to do a partial walk with synthetized reg and interrupts

 * properties, for example when resolving PCI interrupts when no device

 * node exist for the parent.

 *

 */

extern int of_irq_map_raw(struct device_node *parent, u32 *intspec, u32 *addr,

			  struct of_irq *out_irq);

/***

 * of_irq_map_one - Resolve an interrupt for a device

 * @device:	the device whose interrupt is to be resolved

 * @index:     	index of the interrupt to resolve

 * @out_irq:	structure of_irq filled by this function

 *

 * This function resolves an interrupt, walking the tree, for a given

 * device-tree node. It's the high level pendant to of_irq_map_raw().

 * It also implements the workarounds for OldWolrd Macs.

 */

extern int of_irq_map_one(struct device_node *device, int index,

			  struct of_irq *out_irq);

/***

 * of_irq_map_pci - Resolve the interrupt for a PCI device

 * @pdev:	the device whose interrupt is to be resolved

 * @out_irq:	structure of_irq filled by this function

 *

 * This function resolves the PCI interrupt for a given PCI device. If a

 * device-node exists for a given pci_dev, it will use normal OF tree

 * walking. If not, it will implement standard swizzling and walk up the

 * PCI tree until an device-node is found, at which point it will finish

 * resolving using the OF tree walking.

 */

struct pci_dev;

extern int of_irq_map_pci(struct pci_dev *pdev, struct of_irq *out_irq);

#endif /* __KERNEL__ */

#endif /* _POWERPC_PROM_H */