[linux-2.6-block.git] / arch / powerpc / kernel / prom_parse.c

#undef DEBUG

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/pci_regs.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>

#ifdef DEBUG
#define DBG(fmt...) do { printk(fmt); } while(0)
#else
#define DBG(fmt...) do { } while(0)
#endif

#ifdef CONFIG_PPC64
#define PRu64	"%lx"
#else
#define PRu64	"%llx"
#endif

/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS	4
#define OF_CHECK_COUNTS(na, ns)	((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
			(ns) > 0)

/* Debug utility */
#ifdef DEBUG
static void of_dump_addr(const char *s, u32 *addr, int na)
{
	printk("%s", s);
	while(na--)
		printk(" %08x", *(addr++));
	printk("\n");
}
#else
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 {
	const char	*name;
	const char	*addresses;
	int		(*match)(struct device_node *parent);
	void		(*count_cells)(struct device_node *child,
				       int *addrc, int *sizec);
	u64		(*map)(u32 *addr, u32 *range, int na, int ns, int pna);
	int		(*translate)(u32 *addr, u64 offset, int na);
	unsigned int	(*get_flags)(u32 *addr);
};


/*
 * Default translator (generic bus)
 */

static void of_bus_default_count_cells(struct device_node *dev,
				       int *addrc, int *sizec)
{
	if (addrc)
		*addrc = prom_n_addr_cells(dev);
	if (sizec)
		*sizec = prom_n_size_cells(dev);
}

static u64 of_bus_default_map(u32 *addr, u32 *range, int na, int ns, int pna)
{
	u64 cp, s, da;

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

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

	if (da < cp || da >= (cp + s))
		return OF_BAD_ADDR;
	return da - cp;
}

static int of_bus_default_translate(u32 *addr, u64 offset, int na)
{
	u64 a = of_read_addr(addr, na);
	memset(addr, 0, na * 4);
	a += offset;
	if (na > 1)
		addr[na - 2] = a >> 32;
	addr[na - 1] = a & 0xffffffffu;

	return 0;
}

static unsigned int of_bus_default_get_flags(u32 *addr)
{
	return IORESOURCE_MEM;
}


/*
 * PCI bus specific translator
 */

static int of_bus_pci_match(struct device_node *np)
{
	return !strcmp(np->type, "pci");
}

static void of_bus_pci_count_cells(struct device_node *np,
				   int *addrc, int *sizec)
{
	if (addrc)
		*addrc = 3;
	if (sizec)
		*sizec = 2;
}

static u64 of_bus_pci_map(u32 *addr, u32 *range, int na, int ns, int pna)
{
	u64 cp, s, da;

	/* Check address type match */
	if ((addr[0] ^ range[0]) & 0x03000000)
		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);

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

	if (da < cp || da >= (cp + s))
		return OF_BAD_ADDR;
	return da - cp;
}

static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
{
	return of_bus_default_translate(addr + 1, offset, na - 1);
}

static unsigned int of_bus_pci_get_flags(u32 *addr)
{
	unsigned int flags = 0;
	u32 w = addr[0];

	switch((w >> 24) & 0x03) {
	case 0x01:
		flags |= IORESOURCE_IO;
	case 0x02: /* 32 bits */
	case 0x03: /* 64 bits */
		flags |= IORESOURCE_MEM;
	}
	if (w & 0x40000000)
		flags |= IORESOURCE_PREFETCH;
	return flags;
}

/*
 * ISA bus specific translator
 */

static int of_bus_isa_match(struct device_node *np)
{
	return !strcmp(np->name, "isa");
}

static void of_bus_isa_count_cells(struct device_node *child,
				   int *addrc, int *sizec)
{
	if (addrc)
		*addrc = 2;
	if (sizec)
		*sizec = 1;
}

static u64 of_bus_isa_map(u32 *addr, u32 *range, int na, int ns, int pna)
{
	u64 cp, s, da;

	/* Check address type match */
	if ((addr[0] ^ range[0]) & 0x00000001)
		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);

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

	if (da < cp || da >= (cp + s))
		return OF_BAD_ADDR;
	return da - cp;
}

static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
{
	return of_bus_default_translate(addr + 1, offset, na - 1);
}

static unsigned int of_bus_isa_get_flags(u32 *addr)
{
	unsigned int flags = 0;
	u32 w = addr[0];

	if (w & 1)
		flags |= IORESOURCE_IO;
	else
		flags |= IORESOURCE_MEM;
	return flags;
}


/*
 * Array of bus specific translators
 */

static struct of_bus of_busses[] = {
	/* PCI */
	{
		.name = "pci",
		.addresses = "assigned-addresses",
		.match = of_bus_pci_match,
		.count_cells = of_bus_pci_count_cells,
		.map = of_bus_pci_map,
		.translate = of_bus_pci_translate,
		.get_flags = of_bus_pci_get_flags,
	},
	/* ISA */
	{
		.name = "isa",
		.addresses = "reg",
		.match = of_bus_isa_match,
		.count_cells = of_bus_isa_count_cells,
		.map = of_bus_isa_map,
		.translate = of_bus_isa_translate,
		.get_flags = of_bus_isa_get_flags,
	},
	/* Default */
	{
		.name = "default",
		.addresses = "reg",
		.match = NULL,
		.count_cells = of_bus_default_count_cells,
		.map = of_bus_default_map,
		.translate = of_bus_default_translate,
		.get_flags = of_bus_default_get_flags,
	},
};

static struct of_bus *of_match_bus(struct device_node *np)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
		if (!of_busses[i].match || of_busses[i].match(np))
			return &of_busses[i];
	BUG();
	return NULL;
}

static int of_translate_one(struct device_node *parent, struct of_bus *bus,
			    struct of_bus *pbus, u32 *addr,
			    int na, int ns, int pna)
{
	u32 *ranges;
	unsigned int rlen;
	int rone;
	u64 offset = OF_BAD_ADDR;

	/* Normally, an absence of a "ranges" property means we are
	 * crossing a non-translatable boundary, and thus the addresses
	 * below the current not cannot be converted to CPU physical ones.
	 * Unfortunately, while this is very clear in the spec, it's not
	 * what Apple understood, and they do have things like /uni-n or
	 * /ht nodes with no "ranges" property and a lot of perfectly
	 * useable mapped devices below them. Thus we treat the absence of
	 * "ranges" as equivalent to an empty "ranges" property which means
	 * a 1:1 translation at that level. It's up to the caller not to try
	 * to translate addresses that aren't supposed to be translated in
	 * the first place. --BenH.
	 */
	ranges = (u32 *)get_property(parent, "ranges", &rlen);
	if (ranges == NULL || rlen == 0) {
		offset = of_read_addr(addr, na);
		memset(addr, 0, pna * 4);
		DBG("OF: no ranges, 1:1 translation\n");
		goto finish;
	}

	DBG("OF: walking ranges...\n");

	/* Now walk through the ranges */
	rlen /= 4;
	rone = na + pna + ns;
	for (; rlen >= rone; rlen -= rone, ranges += rone) {
		offset = bus->map(addr, ranges, na, ns, pna);
		if (offset != OF_BAD_ADDR)
			break;
	}
	if (offset == OF_BAD_ADDR) {
		DBG("OF: not found !\n");
		return 1;
	}
	memcpy(addr, ranges + na, 4 * pna);

 finish:
	of_dump_addr("OF: parent translation for:", addr, pna);
	DBG("OF: with offset: "PRu64"\n", offset);

	/* Translate it into parent bus space */
	return pbus->translate(addr, offset, pna);
}


/*
 * Translate an address from the device-tree into a CPU physical address,
 * this walks up the tree and applies the various bus mappings on the
 * way.
 *
 * Note: We consider that crossing any level with #size-cells == 0 to mean
 * that translation is impossible (that is we are not dealing with a value
 * that can be mapped to a cpu physical address). This is not really specified
 * that way, but this is traditionally the way IBM at least do things
 */
u64 of_translate_address(struct device_node *dev, u32 *in_addr)
{
	struct device_node *parent = NULL;
	struct of_bus *bus, *pbus;
	u32 addr[OF_MAX_ADDR_CELLS];
	int na, ns, pna, pns;
	u64 result = OF_BAD_ADDR;

	DBG("OF: ** translation for device %s **\n", dev->full_name);

	/* Increase refcount at current level */
	of_node_get(dev);

	/* Get parent & match bus type */
	parent = of_get_parent(dev);
	if (parent == NULL)
		goto bail;
	bus = of_match_bus(parent);

	/* Cound address cells & copy address locally */
	bus->count_cells(dev, &na, &ns);
	if (!OF_CHECK_COUNTS(na, ns)) {
		printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
		       dev->full_name);
		goto bail;
	}
	memcpy(addr, in_addr, na * 4);

	DBG("OF: bus is %s (na=%d, ns=%d) on %s\n",
	    bus->name, na, ns, parent->full_name);
	of_dump_addr("OF: translating address:", addr, na);

	/* Translate */
	for (;;) {
		/* Switch to parent bus */
		of_node_put(dev);
		dev = parent;
		parent = of_get_parent(dev);

		/* If root, we have finished */
		if (parent == NULL) {
			DBG("OF: reached root node\n");
			result = of_read_addr(addr, na);
			break;
		}

		/* Get new parent bus and counts */
		pbus = of_match_bus(parent);
		pbus->count_cells(dev, &pna, &pns);
		if (!OF_CHECK_COUNTS(pna, pns)) {
			printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
			       dev->full_name);
			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);

u32 *of_get_address(struct device_node *dev, int index, u64 *size,
		    unsigned int *flags)
{
	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 = (u32 *)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_addr(prop + na, ns);
			if (flags)
				*flags = bus->get_flags(prop);
			return prop;
		}
	return NULL;
}
EXPORT_SYMBOL(of_get_address);

u32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
			unsigned int *flags)
{
	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);
	if (strcmp(bus->name, "pci"))
		return NULL;
	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 = (u32 *)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 ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
			if (size)
				*size = of_read_addr(prop + na, ns);
			if (flags)
				*flags = bus->get_flags(prop);
			return prop;
		}
	return NULL;
}
EXPORT_SYMBOL(of_get_pci_address);

static int __of_address_to_resource(struct device_node *dev, 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)
{
	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);

int of_pci_address_to_resource(struct device_node *dev, int bar,
			       struct resource *r)
{
	u32		*addrp;
	u64		size;
	unsigned int	flags;

	addrp = of_get_pci_address(dev, bar, &size, &flags);
	if (addrp == NULL)
		return -EINVAL;
	return __of_address_to_resource(dev, addrp, size, flags, r);
}
EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
Commit	Line	Data
d1405b86 BH	1	#undef DEBUG
	2
	3	#include <linux/kernel.h>
	4	#include <linux/string.h>
	5	#include <linux/pci_regs.h>
	6	#include <linux/module.h>
d2dd482b	7	#include <linux/ioport.h>
d1405b86	8	#include <asm/prom.h>
d2dd482b	9	#include <asm/pci-bridge.h>
d1405b86 BH	10
	11	#ifdef DEBUG
	12	#define DBG(fmt...) do { printk(fmt); } while(0)
	13	#else
	14	#define DBG(fmt...) do { } while(0)
	15	#endif
	16
	17	#ifdef CONFIG_PPC64
	18	#define PRu64 "%lx"
	19	#else
	20	#define PRu64 "%llx"
	21	#endif
	22
	23	/* Max address size we deal with */
	24	#define OF_MAX_ADDR_CELLS 4
	25	#define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
	26	(ns) > 0)
	27
	28	/* Debug utility */
	29	#ifdef DEBUG
	30	static void of_dump_addr(const char s, u32 addr, int na)
	31	{
	32	printk("%s", s);
	33	while(na--)
	34	printk(" %08x", *(addr++));
	35	printk("\n");
	36	}
	37	#else
	38	static void of_dump_addr(const char s, u32 addr, int na) { }
	39	#endif
	40
	41	/* Read a big address */
	42	static inline u64 of_read_addr(u32 *cell, int size)
	43	{
	44	u64 r = 0;
	45	while (size--)
	46	r = (r << 32) \| *(cell++);
	47	return r;
	48	}
	49
	50	/* Callbacks for bus specific translators */
	51	struct of_bus {
	52	const char *name;
	53	const char *addresses;
	54	int (match)(struct device_node parent);
	55	void (count_cells)(struct device_node child,
	56	int addrc, int sizec);
	57	u64 (map)(u32 addr, u32 *range, int na, int ns, int pna);
	58	int (translate)(u32 addr, u64 offset, int na);
d2dd482b	59	unsigned int (get_flags)(u32 addr);
d1405b86 BH	60	};
	61
	62
	63	/*
	64	* Default translator (generic bus)
	65	*/
	66
d2dd482b BH	67	static void of_bus_default_count_cells(struct device_node *dev,
d2dd482b BH	68	int addrc, int sizec)
d1405b86 BH	69	{
	70	if (addrc)
	71	*addrc = prom_n_addr_cells(dev);
	72	if (sizec)
	73	*sizec = prom_n_size_cells(dev);
	74	}
	75
d2dd482b	76	static u64 of_bus_default_map(u32 addr, u32 range, int na, int ns, int pna)
d1405b86 BH	77	{
	78	u64 cp, s, da;
	79
	80	cp = of_read_addr(range, na);
	81	s = of_read_addr(range + na + pna, ns);
	82	da = of_read_addr(addr, na);
	83
	84	DBG("OF: default map, cp="PRu64", s="PRu64", da="PRu64"\n",
	85	cp, s, da);
	86
	87	if (da < cp \|\| da >= (cp + s))
	88	return OF_BAD_ADDR;
	89	return da - cp;
	90	}
	91
d2dd482b	92	static int of_bus_default_translate(u32 *addr, u64 offset, int na)
d1405b86 BH	93	{
	94	u64 a = of_read_addr(addr, na);
	95	memset(addr, 0, na * 4);
	96	a += offset;
	97	if (na > 1)
	98	addr[na - 2] = a >> 32;
	99	addr[na - 1] = a & 0xffffffffu;
	100
	101	return 0;
	102	}
	103
d2dd482b BH	104	static unsigned int of_bus_default_get_flags(u32 *addr)
	105	{
	106	return IORESOURCE_MEM;
	107	}
	108
d1405b86 BH	109
	110	/*
	111	* PCI bus specific translator
	112	*/
	113
	114	static int of_bus_pci_match(struct device_node *np)
	115	{
	116	return !strcmp(np->type, "pci");
	117	}
	118
	119	static void of_bus_pci_count_cells(struct device_node *np,
	120	int addrc, int sizec)
	121	{
	122	if (addrc)
	123	*addrc = 3;
	124	if (sizec)
	125	*sizec = 2;
	126	}
	127
	128	static u64 of_bus_pci_map(u32 addr, u32 range, int na, int ns, int pna)
	129	{
	130	u64 cp, s, da;
	131
	132	/* Check address type match */
	133	if ((addr[0] ^ range[0]) & 0x03000000)
	134	return OF_BAD_ADDR;
	135
	136	/* Read address values, skipping high cell */
	137	cp = of_read_addr(range + 1, na - 1);
	138	s = of_read_addr(range + na + pna, ns);
	139	da = of_read_addr(addr + 1, na - 1);
	140
	141	DBG("OF: PCI map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
	142
	143	if (da < cp \|\| da >= (cp + s))
	144	return OF_BAD_ADDR;
	145	return da - cp;
	146	}
	147
	148	static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
	149	{
d2dd482b BH	150	return of_bus_default_translate(addr + 1, offset, na - 1);
	151	}
	152
	153	static unsigned int of_bus_pci_get_flags(u32 *addr)
	154	{
	155	unsigned int flags = 0;
	156	u32 w = addr[0];
	157
	158	switch((w >> 24) & 0x03) {
	159	case 0x01:
	160	flags \|= IORESOURCE_IO;
	161	case 0x02: /* 32 bits */
	162	case 0x03: /* 64 bits */
	163	flags \|= IORESOURCE_MEM;
	164	}
	165	if (w & 0x40000000)
	166	flags \|= IORESOURCE_PREFETCH;
	167	return flags;
d1405b86 BH	168	}
	169
	170	/*
	171	* ISA bus specific translator
	172	*/
	173
	174	static int of_bus_isa_match(struct device_node *np)
	175	{
	176	return !strcmp(np->name, "isa");
	177	}
	178
	179	static void of_bus_isa_count_cells(struct device_node *child,
	180	int addrc, int sizec)
	181	{
	182	if (addrc)
	183	*addrc = 2;
	184	if (sizec)
	185	*sizec = 1;
	186	}
	187
	188	static u64 of_bus_isa_map(u32 addr, u32 range, int na, int ns, int pna)
	189	{
	190	u64 cp, s, da;
	191
	192	/* Check address type match */
	193	if ((addr[0] ^ range[0]) & 0x00000001)
	194	return OF_BAD_ADDR;
	195
	196	/* Read address values, skipping high cell */
	197	cp = of_read_addr(range + 1, na - 1);
	198	s = of_read_addr(range + na + pna, ns);
	199	da = of_read_addr(addr + 1, na - 1);
	200
	201	DBG("OF: ISA map, cp="PRu64", s="PRu64", da="PRu64"\n", cp, s, da);
	202
	203	if (da < cp \|\| da >= (cp + s))
	204	return OF_BAD_ADDR;
	205	return da - cp;
	206	}
	207
	208	static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
	209	{
d2dd482b BH	210	return of_bus_default_translate(addr + 1, offset, na - 1);
	211	}
	212
	213	static unsigned int of_bus_isa_get_flags(u32 *addr)
	214	{
	215	unsigned int flags = 0;
	216	u32 w = addr[0];
	217
	218	if (w & 1)
	219	flags \|= IORESOURCE_IO;
	220	else
	221	flags \|= IORESOURCE_MEM;
	222	return flags;
d1405b86 BH	223	}
d1405b86 BH	224
d2dd482b	225
d1405b86 BH	226	/*
	227	* Array of bus specific translators
	228	*/
	229
	230	static struct of_bus of_busses[] = {
	231	/* PCI */
	232	{
	233	.name = "pci",
	234	.addresses = "assigned-addresses",
	235	.match = of_bus_pci_match,
	236	.count_cells = of_bus_pci_count_cells,
	237	.map = of_bus_pci_map,
	238	.translate = of_bus_pci_translate,
d2dd482b	239	.get_flags = of_bus_pci_get_flags,
d1405b86 BH	240	},
	241	/* ISA */
	242	{
	243	.name = "isa",
	244	.addresses = "reg",
	245	.match = of_bus_isa_match,
	246	.count_cells = of_bus_isa_count_cells,
	247	.map = of_bus_isa_map,
	248	.translate = of_bus_isa_translate,
d2dd482b	249	.get_flags = of_bus_isa_get_flags,
d1405b86 BH	250	},
	251	/* Default */
	252	{
	253	.name = "default",
	254	.addresses = "reg",
	255	.match = NULL,
d2dd482b BH	256	.count_cells = of_bus_default_count_cells,
	257	.map = of_bus_default_map,
	258	.translate = of_bus_default_translate,
	259	.get_flags = of_bus_default_get_flags,
d1405b86 BH	260	},
	261	};
	262
	263	static struct of_bus of_match_bus(struct device_node np)
	264	{
	265	int i;
	266
	267	for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
	268	if (!of_busses[i].match \|\| of_busses[i].match(np))
	269	return &of_busses[i];
	270	BUG();
	271	return NULL;
	272	}
	273
	274	static int of_translate_one(struct device_node parent, struct of_bus bus,
	275	struct of_bus pbus, u32 addr,
	276	int na, int ns, int pna)
	277	{
	278	u32 *ranges;
	279	unsigned int rlen;
	280	int rone;
	281	u64 offset = OF_BAD_ADDR;
	282
	283	/* Normally, an absence of a "ranges" property means we are
	284	* crossing a non-translatable boundary, and thus the addresses
	285	* below the current not cannot be converted to CPU physical ones.
	286	* Unfortunately, while this is very clear in the spec, it's not
	287	* what Apple understood, and they do have things like /uni-n or
	288	* /ht nodes with no "ranges" property and a lot of perfectly
	289	* useable mapped devices below them. Thus we treat the absence of
	290	* "ranges" as equivalent to an empty "ranges" property which means
	291	* a 1:1 translation at that level. It's up to the caller not to try
	292	* to translate addresses that aren't supposed to be translated in
	293	* the first place. --BenH.
	294	*/
	295	ranges = (u32 *)get_property(parent, "ranges", &rlen);
	296	if (ranges == NULL \|\| rlen == 0) {
	297	offset = of_read_addr(addr, na);
d2dd482b BH	298	memset(addr, 0, pna * 4);
d2dd482b BH	299	DBG("OF: no ranges, 1:1 translation\n");
d1405b86 BH	300	goto finish;
	301	}
	302
	303	DBG("OF: walking ranges...\n");
	304
	305	/* Now walk through the ranges */
	306	rlen /= 4;
	307	rone = na + pna + ns;
	308	for (; rlen >= rone; rlen -= rone, ranges += rone) {
	309	offset = bus->map(addr, ranges, na, ns, pna);
	310	if (offset != OF_BAD_ADDR)
	311	break;
	312	}
	313	if (offset == OF_BAD_ADDR) {
	314	DBG("OF: not found !\n");
	315	return 1;
	316	}
	317	memcpy(addr, ranges + na, 4 * pna);
	318
	319	finish:
	320	of_dump_addr("OF: parent translation for:", addr, pna);
bb6b9b28	321	DBG("OF: with offset: "PRu64"\n", offset);
d1405b86 BH	322
	323	/* Translate it into parent bus space */
	324	return pbus->translate(addr, offset, pna);
	325	}
	326
	327
	328	/*
	329	* Translate an address from the device-tree into a CPU physical address,
	330	* this walks up the tree and applies the various bus mappings on the
	331	* way.
	332	*
	333	* Note: We consider that crossing any level with #size-cells == 0 to mean
	334	* that translation is impossible (that is we are not dealing with a value
	335	* that can be mapped to a cpu physical address). This is not really specified
	336	* that way, but this is traditionally the way IBM at least do things
	337	*/
	338	u64 of_translate_address(struct device_node dev, u32 in_addr)
	339	{
	340	struct device_node *parent = NULL;
	341	struct of_bus bus, pbus;
	342	u32 addr[OF_MAX_ADDR_CELLS];
	343	int na, ns, pna, pns;
	344	u64 result = OF_BAD_ADDR;
	345
	346	DBG("OF: translation for device %s \n", dev->full_name);
	347
	348	/* Increase refcount at current level */
	349	of_node_get(dev);
	350
	351	/* Get parent & match bus type */
	352	parent = of_get_parent(dev);
	353	if (parent == NULL)
	354	goto bail;
	355	bus = of_match_bus(parent);
	356
	357	/* Cound address cells & copy address locally */
	358	bus->count_cells(dev, &na, &ns);
	359	if (!OF_CHECK_COUNTS(na, ns)) {
	360	printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
	361	dev->full_name);
	362	goto bail;
	363	}
	364	memcpy(addr, in_addr, na * 4);
	365
	366	DBG("OF: bus is %s (na=%d, ns=%d) on %s\n",
	367	bus->name, na, ns, parent->full_name);
	368	of_dump_addr("OF: translating address:", addr, na);
	369
	370	/* Translate */
	371	for (;;) {
	372	/* Switch to parent bus */
	373	of_node_put(dev);
	374	dev = parent;
	375	parent = of_get_parent(dev);
	376
	377	/* If root, we have finished */
	378	if (parent == NULL) {
	379	DBG("OF: reached root node\n");
	380	result = of_read_addr(addr, na);
	381	break;
	382	}
	383
	384	/* Get new parent bus and counts */
	385	pbus = of_match_bus(parent);
386	pbus->count_cells(dev, &pna, &pns);
387	if (!OF_CHECK_COUNTS(pna, pns)) {
388	printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
389	dev->full_name);
390	break;
391	}
392
393	DBG("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
394	pbus->name, pna, pns, parent->full_name);
395
396	/* Apply bus translation */
397	if (of_translate_one(dev, bus, pbus, addr, na, ns, pna))
398	break;
399
400	/* Complete the move up one level */
401	na = pna;
402	ns = pns;
403	bus = pbus;
404
405	of_dump_addr("OF: one level translation:", addr, na);
406	}
407	bail:
408	of_node_put(parent);
409	of_node_put(dev);
410
411	return result;
412	}
413	EXPORT_SYMBOL(of_translate_address);
414
d2dd482b BH	415	u32 of_get_address(struct device_node dev, int index, u64 *size,
d2dd482b BH	416	unsigned int *flags)
d1405b86 BH	417	{
	418	u32 *prop;
	419	unsigned int psize;
	420	struct device_node *parent;
	421	struct of_bus *bus;
	422	int onesize, i, na, ns;
	423
	424	/* Get parent & match bus type */
	425	parent = of_get_parent(dev);
	426	if (parent == NULL)
	427	return NULL;
	428	bus = of_match_bus(parent);
	429	bus->count_cells(dev, &na, &ns);
	430	of_node_put(parent);
	431	if (!OF_CHECK_COUNTS(na, ns))
	432	return NULL;
	433
	434	/* Get "reg" or "assigned-addresses" property */
	435	prop = (u32 *)get_property(dev, bus->addresses, &psize);
	436	if (prop == NULL)
	437	return NULL;
	438	psize /= 4;
	439
	440	onesize = na + ns;
	441	for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
	442	if (i == index) {
	443	if (size)
	444	*size = of_read_addr(prop + na, ns);
d2dd482b BH	445	if (flags)
d2dd482b BH	446	*flags = bus->get_flags(prop);
d1405b86 BH	447	return prop;
	448	}
	449	return NULL;
	450	}
	451	EXPORT_SYMBOL(of_get_address);
	452
d2dd482b BH	453	u32 of_get_pci_address(struct device_node dev, int bar_no, u64 *size,
d2dd482b BH	454	unsigned int *flags)
d1405b86	455	{
d2dd482b BH	456	u32 *prop;
	457	unsigned int psize;
	458	struct device_node *parent;
	459	struct of_bus *bus;
	460	int onesize, i, na, ns;
d1405b86	461
d2dd482b BH	462	/* Get parent & match bus type */
	463	parent = of_get_parent(dev);
	464	if (parent == NULL)
	465	return NULL;
	466	bus = of_match_bus(parent);
	467	if (strcmp(bus->name, "pci"))
	468	return NULL;
	469	bus->count_cells(dev, &na, &ns);
	470	of_node_put(parent);
	471	if (!OF_CHECK_COUNTS(na, ns))
	472	return NULL;
	473
	474	/* Get "reg" or "assigned-addresses" property */
	475	prop = (u32 *)get_property(dev, bus->addresses, &psize);
	476	if (prop == NULL)
	477	return NULL;
	478	psize /= 4;
	479
	480	onesize = na + ns;
	481	for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
	482	if ((prop[0] & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
	483	if (size)
	484	*size = of_read_addr(prop + na, ns);
	485	if (flags)
	486	*flags = bus->get_flags(prop);
	487	return prop;
	488	}
d1405b86 BH	489	return NULL;
	490	}
	491	EXPORT_SYMBOL(of_get_pci_address);
d2dd482b BH	492
	493	static int __of_address_to_resource(struct device_node dev, u32 addrp,
	494	u64 size, unsigned int flags,
	495	struct resource *r)
	496	{
	497	u64 taddr;
	498
	499	if ((flags & (IORESOURCE_IO \| IORESOURCE_MEM)) == 0)
	500	return -EINVAL;
	501	taddr = of_translate_address(dev, addrp);
	502	if (taddr == OF_BAD_ADDR)
	503	return -EINVAL;
	504	memset(r, 0, sizeof(struct resource));
	505	if (flags & IORESOURCE_IO) {
f2c4583a	506	unsigned long port;
d2dd482b	507	port = pci_address_to_pio(taddr);
f2c4583a	508	if (port == (unsigned long)-1)
d2dd482b BH	509	return -EINVAL;
	510	r->start = port;
	511	r->end = port + size - 1;
	512	} else {
	513	r->start = taddr;
	514	r->end = taddr + size - 1;
	515	}
	516	r->flags = flags;
	517	r->name = dev->name;
	518	return 0;
	519	}
	520
	521	int of_address_to_resource(struct device_node *dev, int index,
	522	struct resource *r)
	523	{
	524	u32 *addrp;
	525	u64 size;
	526	unsigned int flags;
	527
	528	addrp = of_get_address(dev, index, &size, &flags);
	529	if (addrp == NULL)
	530	return -EINVAL;
	531	return __of_address_to_resource(dev, addrp, size, flags, r);
	532	}
	533	EXPORT_SYMBOL_GPL(of_address_to_resource);
	534
	535	int of_pci_address_to_resource(struct device_node *dev, int bar,
	536	struct resource *r)
	537	{
	538	u32 *addrp;
	539	u64 size;
	540	unsigned int flags;
	541
	542	addrp = of_get_pci_address(dev, bar, &size, &flags);
	543	if (addrp == NULL)
	544	return -EINVAL;
	545	return __of_address_to_resource(dev, addrp, size, flags, r);
	546	}
	547	EXPORT_SYMBOL_GPL(of_pci_address_to_resource);