[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / of / address.c


#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/pci_regs.h>
#include <linux/string.h>

/* 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)

static struct of_bus *of_match_bus(struct device_node *np);
static int __of_address_to_resource(struct device_node *dev,
		const __be32 *addrp, u64 size, unsigned int flags,
				    struct resource *r);

/* Debug utility */
#ifdef DEBUG
static void of_dump_addr(const char *s, const __be32 *addr, int na)
{
	printk(KERN_DEBUG "%s", s);
	while (na--)
		printk(" %08x", be32_to_cpu(*(addr++)));
	printk("\n");
}
#else
static void of_dump_addr(const char *s, const __be32 *addr, int na) { }
#endif

/* 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, const __be32 *range,
				int na, int ns, int pna);
	int		(*translate)(u32 *addr, u64 offset, int na);
	unsigned int	(*get_flags)(const __be32 *addr);
};

/*
 * Default translator (generic bus)
 */

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

static u64 of_bus_default_map(u32 *addr, const __be32 *range,
		int na, int ns, int pna)
{
	u64 cp, s, da;

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

	pr_debug("OF: default map, cp=%llx, s=%llx, da=%llx\n",
		 (unsigned long long)cp, (unsigned long long)s,
		 (unsigned long long)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_number(addr, na);
	memset(addr, 0, na * 4);
	a += offset;
	if (na > 1)
		addr[na - 2] = cpu_to_be32(a >> 32);
	addr[na - 1] = cpu_to_be32(a & 0xffffffffu);

	return 0;
}

static unsigned int of_bus_default_get_flags(const __be32 *addr)
{
	return IORESOURCE_MEM;
}

#ifdef CONFIG_PCI
/*
 * PCI bus specific translator
 */

static int of_bus_pci_match(struct device_node *np)
{
	/* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */
	return !strcmp(np->type, "pci") || !strcmp(np->type, "vci");
}

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

static unsigned int of_bus_pci_get_flags(const __be32 *addr)
{
	unsigned int flags = 0;
	u32 w = be32_to_cpup(addr);

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

static u64 of_bus_pci_map(u32 *addr, const __be32 *range, int na, int ns,
		int pna)
{
	u64 cp, s, da;
	unsigned int af, rf;

	af = of_bus_pci_get_flags(addr);
	rf = of_bus_pci_get_flags(range);

	/* Check address type match */
	if ((af ^ rf) & (IORESOURCE_MEM | IORESOURCE_IO))
		return OF_BAD_ADDR;

	/* Read address values, skipping high cell */
	cp = of_read_number(range + 1, na - 1);
	s  = of_read_number(range + na + pna, ns);
	da = of_read_number(addr + 1, na - 1);

	pr_debug("OF: PCI map, cp=%llx, s=%llx, da=%llx\n",
		 (unsigned long long)cp, (unsigned long long)s,
		 (unsigned long long)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);
}

const __be32 *of_get_pci_address(struct device_node *dev, int bar_no, u64 *size,
			unsigned int *flags)
{
	const __be32 *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")) {
		of_node_put(parent);
		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 = 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++) {
		u32 val = be32_to_cpu(prop[0]);
		if ((val & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
			if (size)
				*size = of_read_number(prop + na, ns);
			if (flags)
				*flags = bus->get_flags(prop);
			return prop;
		}
	}
	return NULL;
}
EXPORT_SYMBOL(of_get_pci_address);

int of_pci_address_to_resource(struct device_node *dev, int bar,
			       struct resource *r)
{
	const __be32	*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);
#endif /* CONFIG_PCI */

/*
 * 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, const __be32 *range, int na, int ns,
		int pna)
{
	u64 cp, s, da;

	/* Check address type match */
	if ((addr[0] ^ range[0]) & cpu_to_be32(1))
		return OF_BAD_ADDR;

	/* Read address values, skipping high cell */
	cp = of_read_number(range + 1, na - 1);
	s  = of_read_number(range + na + pna, ns);
	da = of_read_number(addr + 1, na - 1);

	pr_debug("OF: ISA map, cp=%llx, s=%llx, da=%llx\n",
		 (unsigned long long)cp, (unsigned long long)s,
		 (unsigned long long)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(const __be32 *addr)
{
	unsigned int flags = 0;
	u32 w = be32_to_cpup(addr);

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

/*
 * Array of bus specific translators
 */

static struct of_bus of_busses[] = {
#ifdef CONFIG_PCI
	/* 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,
	},
#endif /* CONFIG_PCI */
	/* 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, const char *rprop)
{
	const __be32 *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.
	 *
	 * As far as we know, this damage only exists on Apple machines, so
	 * This code is only enabled on powerpc. --gcl
	 */
	ranges = of_get_property(parent, rprop, &rlen);
#if !defined(CONFIG_PPC)
	if (ranges == NULL) {
		pr_err("OF: no ranges; cannot translate\n");
		return 1;
	}
#endif /* !defined(CONFIG_PPC) */
	if (ranges == NULL || rlen == 0) {
		offset = of_read_number(addr, na);
		memset(addr, 0, pna * 4);
		pr_debug("OF: empty ranges; 1:1 translation\n");
		goto finish;
	}

	pr_debug("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) {
		pr_debug("OF: not found !\n");
		return 1;
	}
	memcpy(addr, ranges + na, 4 * pna);

 finish:
	of_dump_addr("OF: parent translation for:", addr, pna);
	pr_debug("OF: with offset: %llx\n", (unsigned long long)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, const __be32 *in_addr,
			   const char *rprop)
{
	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;

	pr_debug("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);

	pr_debug("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) {
			pr_debug("OF: reached root node\n");
			result = of_read_number(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;
		}

		pr_debug("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, rprop))
			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;
}

u64 of_translate_address(struct device_node *dev, const __be32 *in_addr)
{
	return __of_translate_address(dev, in_addr, "ranges");
}
EXPORT_SYMBOL(of_translate_address);

u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr)
{
	return __of_translate_address(dev, in_addr, "dma-ranges");
}
EXPORT_SYMBOL(of_translate_dma_address);

const __be32 *of_get_address(struct device_node *dev, int index, u64 *size,
		    unsigned int *flags)
{
	const __be32 *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 __be32 *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->full_name;
	return 0;
}

/**
 * of_address_to_resource - Translate device tree address and return as resource
 *
 * Note that if your address is a PIO address, the conversion will fail if
 * the physical address can't be internally converted to an IO token with
 * pci_address_to_pio(), that is because it's either called to early or it
 * can't be matched to any host bridge IO space
 */
int of_address_to_resource(struct device_node *dev, int index,
			   struct resource *r)
{
	const __be32	*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);

struct device_node *of_find_matching_node_by_address(struct device_node *from,
					const struct of_device_id *matches,
					u64 base_address)
{
	struct device_node *dn = of_find_matching_node(from, matches);
	struct resource res;

	while (dn) {
		if (of_address_to_resource(dn, 0, &res))
			continue;
		if (res.start == base_address)
			return dn;
		dn = of_find_matching_node(dn, matches);
	}

	return NULL;
}


/**
 * of_iomap - Maps the memory mapped IO for a given device_node
 * @device:	the device whose io range will be mapped
 * @index:	index of the io range
 *
 * Returns a pointer to the mapped memory
 */
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);
Commit	Line	Data
6b884a8d GL	1
	2	#include <linux/io.h>
	3	#include <linux/ioport.h>
dbbdee94	4	#include <linux/module.h>
6b884a8d	5	#include <linux/of_address.h>
dbbdee94 GL	6	#include <linux/pci_regs.h>
dbbdee94 GL	7	#include <linux/string.h>
6b884a8d	8
dbbdee94 GL	9	/* Max address size we deal with */
	10	#define OF_MAX_ADDR_CELLS 4
	11	#define OF_CHECK_COUNTS(na, ns) ((na) > 0 && (na) <= OF_MAX_ADDR_CELLS && \
	12	(ns) > 0)
	13
	14	static struct of_bus of_match_bus(struct device_node np);
0131d897 SAS	15	static int __of_address_to_resource(struct device_node *dev,
0131d897 SAS	16	const __be32 *addrp, u64 size, unsigned int flags,
dbbdee94 GL	17	struct resource *r);
	18
	19	/* Debug utility */
	20	#ifdef DEBUG
0131d897	21	static void of_dump_addr(const char s, const __be32 addr, int na)
dbbdee94 GL	22	{
	23	printk(KERN_DEBUG "%s", s);
	24	while (na--)
154063a9	25	printk(" %08x", be32_to_cpu(*(addr++)));
dbbdee94 GL	26	printk("\n");
	27	}
	28	#else
0131d897	29	static void of_dump_addr(const char s, const __be32 addr, int na) { }
dbbdee94 GL	30	#endif
	31
	32	/* Callbacks for bus specific translators */
	33	struct of_bus {
	34	const char *name;
	35	const char *addresses;
	36	int (match)(struct device_node parent);
	37	void (count_cells)(struct device_node child,
	38	int addrc, int sizec);
0131d897	39	u64 (map)(u32 addr, const __be32 *range,
dbbdee94 GL	40	int na, int ns, int pna);
dbbdee94 GL	41	int (translate)(u32 addr, u64 offset, int na);
0131d897	42	unsigned int (get_flags)(const __be32 addr);
dbbdee94 GL	43	};
	44
	45	/*
	46	* Default translator (generic bus)
	47	*/
	48
	49	static void of_bus_default_count_cells(struct device_node *dev,
	50	int addrc, int sizec)
	51	{
	52	if (addrc)
	53	*addrc = of_n_addr_cells(dev);
	54	if (sizec)
	55	*sizec = of_n_size_cells(dev);
	56	}
	57
0131d897	58	static u64 of_bus_default_map(u32 addr, const __be32 range,
dbbdee94 GL	59	int na, int ns, int pna)
	60	{
	61	u64 cp, s, da;
	62
	63	cp = of_read_number(range, na);
	64	s = of_read_number(range + na + pna, ns);
	65	da = of_read_number(addr, na);
	66
	67	pr_debug("OF: default map, cp=%llx, s=%llx, da=%llx\n",
	68	(unsigned long long)cp, (unsigned long long)s,
	69	(unsigned long long)da);
	70
	71	if (da < cp \|\| da >= (cp + s))
	72	return OF_BAD_ADDR;
	73	return da - cp;
	74	}
	75
	76	static int of_bus_default_translate(u32 *addr, u64 offset, int na)
	77	{
	78	u64 a = of_read_number(addr, na);
	79	memset(addr, 0, na * 4);
	80	a += offset;
	81	if (na > 1)
154063a9 GL	82	addr[na - 2] = cpu_to_be32(a >> 32);
154063a9 GL	83	addr[na - 1] = cpu_to_be32(a & 0xffffffffu);
dbbdee94 GL	84
	85	return 0;
	86	}
	87
0131d897	88	static unsigned int of_bus_default_get_flags(const __be32 *addr)
dbbdee94 GL	89	{
	90	return IORESOURCE_MEM;
	91	}
	92
	93	#ifdef CONFIG_PCI
	94	/*
	95	* PCI bus specific translator
	96	*/
	97
	98	static int of_bus_pci_match(struct device_node *np)
	99	{
	100	/* "vci" is for the /chaos bridge on 1st-gen PCI powermacs */
	101	return !strcmp(np->type, "pci") \|\| !strcmp(np->type, "vci");
	102	}
	103
	104	static void of_bus_pci_count_cells(struct device_node *np,
	105	int addrc, int sizec)
	106	{
	107	if (addrc)
	108	*addrc = 3;
	109	if (sizec)
	110	*sizec = 2;
	111	}
	112
0131d897	113	static unsigned int of_bus_pci_get_flags(const __be32 *addr)
dbbdee94 GL	114	{
dbbdee94 GL	115	unsigned int flags = 0;
0131d897	116	u32 w = be32_to_cpup(addr);
dbbdee94 GL	117
	118	switch((w >> 24) & 0x03) {
	119	case 0x01:
	120	flags \|= IORESOURCE_IO;
	121	break;
	122	case 0x02: /* 32 bits */
	123	case 0x03: /* 64 bits */
	124	flags \|= IORESOURCE_MEM;
	125	break;
	126	}
	127	if (w & 0x40000000)
	128	flags \|= IORESOURCE_PREFETCH;
	129	return flags;
	130	}
	131
0131d897 SAS	132	static u64 of_bus_pci_map(u32 addr, const __be32 range, int na, int ns,
0131d897 SAS	133	int pna)
dbbdee94 GL	134	{
	135	u64 cp, s, da;
	136	unsigned int af, rf;
	137
	138	af = of_bus_pci_get_flags(addr);
	139	rf = of_bus_pci_get_flags(range);
	140
	141	/* Check address type match */
	142	if ((af ^ rf) & (IORESOURCE_MEM \| IORESOURCE_IO))
	143	return OF_BAD_ADDR;
	144
	145	/* Read address values, skipping high cell */
	146	cp = of_read_number(range + 1, na - 1);
	147	s = of_read_number(range + na + pna, ns);
	148	da = of_read_number(addr + 1, na - 1);
	149
	150	pr_debug("OF: PCI map, cp=%llx, s=%llx, da=%llx\n",
	151	(unsigned long long)cp, (unsigned long long)s,
	152	(unsigned long long)da);
	153
	154	if (da < cp \|\| da >= (cp + s))
	155	return OF_BAD_ADDR;
	156	return da - cp;
	157	}
	158
	159	static int of_bus_pci_translate(u32 *addr, u64 offset, int na)
	160	{
	161	return of_bus_default_translate(addr + 1, offset, na - 1);
	162	}
	163
0131d897	164	const __be32 of_get_pci_address(struct device_node dev, int bar_no, u64 *size,
dbbdee94 GL	165	unsigned int *flags)
dbbdee94 GL	166	{
a9fadeef	167	const __be32 *prop;
dbbdee94 GL	168	unsigned int psize;
	169	struct device_node *parent;
	170	struct of_bus *bus;
	171	int onesize, i, na, ns;
	172
	173	/* Get parent & match bus type */
	174	parent = of_get_parent(dev);
	175	if (parent == NULL)
	176	return NULL;
	177	bus = of_match_bus(parent);
	178	if (strcmp(bus->name, "pci")) {
	179	of_node_put(parent);
	180	return NULL;
	181	}
	182	bus->count_cells(dev, &na, &ns);
	183	of_node_put(parent);
	184	if (!OF_CHECK_COUNTS(na, ns))
	185	return NULL;
	186
	187	/* Get "reg" or "assigned-addresses" property */
	188	prop = of_get_property(dev, bus->addresses, &psize);
	189	if (prop == NULL)
	190	return NULL;
	191	psize /= 4;
	192
	193	onesize = na + ns;
154063a9 GL	194	for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++) {
	195	u32 val = be32_to_cpu(prop[0]);
	196	if ((val & 0xff) == ((bar_no * 4) + PCI_BASE_ADDRESS_0)) {
dbbdee94 GL	197	if (size)
	198	*size = of_read_number(prop + na, ns);
	199	if (flags)
	200	*flags = bus->get_flags(prop);
	201	return prop;
	202	}
154063a9	203	}
dbbdee94 GL	204	return NULL;
	205	}
	206	EXPORT_SYMBOL(of_get_pci_address);
	207
	208	int of_pci_address_to_resource(struct device_node *dev, int bar,
	209	struct resource *r)
	210	{
0131d897	211	const __be32 *addrp;
dbbdee94 GL	212	u64 size;
	213	unsigned int flags;
	214
	215	addrp = of_get_pci_address(dev, bar, &size, &flags);
	216	if (addrp == NULL)
	217	return -EINVAL;
	218	return __of_address_to_resource(dev, addrp, size, flags, r);
	219	}
	220	EXPORT_SYMBOL_GPL(of_pci_address_to_resource);
	221	#endif /* CONFIG_PCI */
	222
	223	/*
	224	* ISA bus specific translator
	225	*/
	226
	227	static int of_bus_isa_match(struct device_node *np)
	228	{
	229	return !strcmp(np->name, "isa");
	230	}
	231
	232	static void of_bus_isa_count_cells(struct device_node *child,
	233	int addrc, int sizec)
	234	{
	235	if (addrc)
	236	*addrc = 2;
	237	if (sizec)
	238	*sizec = 1;
	239	}
	240
0131d897 SAS	241	static u64 of_bus_isa_map(u32 addr, const __be32 range, int na, int ns,
0131d897 SAS	242	int pna)
dbbdee94 GL	243	{
	244	u64 cp, s, da;
	245
	246	/* Check address type match */
0131d897	247	if ((addr[0] ^ range[0]) & cpu_to_be32(1))
dbbdee94 GL	248	return OF_BAD_ADDR;
	249
	250	/* Read address values, skipping high cell */
	251	cp = of_read_number(range + 1, na - 1);
	252	s = of_read_number(range + na + pna, ns);
	253	da = of_read_number(addr + 1, na - 1);
	254
	255	pr_debug("OF: ISA map, cp=%llx, s=%llx, da=%llx\n",
	256	(unsigned long long)cp, (unsigned long long)s,
	257	(unsigned long long)da);
	258
	259	if (da < cp \|\| da >= (cp + s))
	260	return OF_BAD_ADDR;
	261	return da - cp;
	262	}
	263
	264	static int of_bus_isa_translate(u32 *addr, u64 offset, int na)
	265	{
	266	return of_bus_default_translate(addr + 1, offset, na - 1);
	267	}
	268
0131d897	269	static unsigned int of_bus_isa_get_flags(const __be32 *addr)
dbbdee94 GL	270	{
dbbdee94 GL	271	unsigned int flags = 0;
0131d897	272	u32 w = be32_to_cpup(addr);
dbbdee94 GL	273
	274	if (w & 1)
	275	flags \|= IORESOURCE_IO;
	276	else
	277	flags \|= IORESOURCE_MEM;
	278	return flags;
	279	}
	280
	281	/*
	282	* Array of bus specific translators
	283	*/
	284
	285	static struct of_bus of_busses[] = {
	286	#ifdef CONFIG_PCI
	287	/* PCI */
	288	{
	289	.name = "pci",
	290	.addresses = "assigned-addresses",
	291	.match = of_bus_pci_match,
	292	.count_cells = of_bus_pci_count_cells,
	293	.map = of_bus_pci_map,
	294	.translate = of_bus_pci_translate,
	295	.get_flags = of_bus_pci_get_flags,
	296	},
	297	#endif /* CONFIG_PCI */
	298	/* ISA */
	299	{
	300	.name = "isa",
	301	.addresses = "reg",
	302	.match = of_bus_isa_match,
	303	.count_cells = of_bus_isa_count_cells,
	304	.map = of_bus_isa_map,
	305	.translate = of_bus_isa_translate,
	306	.get_flags = of_bus_isa_get_flags,
	307	},
	308	/* Default */
	309	{
	310	.name = "default",
	311	.addresses = "reg",
	312	.match = NULL,
	313	.count_cells = of_bus_default_count_cells,
	314	.map = of_bus_default_map,
	315	.translate = of_bus_default_translate,
	316	.get_flags = of_bus_default_get_flags,
	317	},
	318	};
	319
	320	static struct of_bus of_match_bus(struct device_node np)
	321	{
	322	int i;
	323
	324	for (i = 0; i < ARRAY_SIZE(of_busses); i++)
	325	if (!of_busses[i].match \|\| of_busses[i].match(np))
	326	return &of_busses[i];
	327	BUG();
	328	return NULL;
	329	}
	330
	331	static int of_translate_one(struct device_node parent, struct of_bus bus,
	332	struct of_bus pbus, u32 addr,
	333	int na, int ns, int pna, const char *rprop)
	334	{
0131d897	335	const __be32 *ranges;
dbbdee94 GL	336	unsigned int rlen;
	337	int rone;
	338	u64 offset = OF_BAD_ADDR;
	339
	340	/* Normally, an absence of a "ranges" property means we are
	341	* crossing a non-translatable boundary, and thus the addresses
	342	* below the current not cannot be converted to CPU physical ones.
	343	* Unfortunately, while this is very clear in the spec, it's not
	344	* what Apple understood, and they do have things like /uni-n or
	345	* /ht nodes with no "ranges" property and a lot of perfectly
	346	* useable mapped devices below them. Thus we treat the absence of
	347	* "ranges" as equivalent to an empty "ranges" property which means
	348	* a 1:1 translation at that level. It's up to the caller not to try
	349	* to translate addresses that aren't supposed to be translated in
	350	* the first place. --BenH.
3930f294 GL	351	*
	352	* As far as we know, this damage only exists on Apple machines, so
	353	* This code is only enabled on powerpc. --gcl
dbbdee94 GL	354	*/
dbbdee94 GL	355	ranges = of_get_property(parent, rprop, &rlen);
3930f294 GL	356	#if !defined(CONFIG_PPC)
	357	if (ranges == NULL) {
	358	pr_err("OF: no ranges; cannot translate\n");
	359	return 1;
	360	}
	361	#endif /* !defined(CONFIG_PPC) */
dbbdee94 GL	362	if (ranges == NULL \|\| rlen == 0) {
	363	offset = of_read_number(addr, na);
	364	memset(addr, 0, pna * 4);
3930f294	365	pr_debug("OF: empty ranges; 1:1 translation\n");
dbbdee94 GL	366	goto finish;
	367	}
	368
	369	pr_debug("OF: walking ranges...\n");
	370
	371	/* Now walk through the ranges */
	372	rlen /= 4;
	373	rone = na + pna + ns;
	374	for (; rlen >= rone; rlen -= rone, ranges += rone) {
	375	offset = bus->map(addr, ranges, na, ns, pna);
	376	if (offset != OF_BAD_ADDR)
	377	break;
	378	}
	379	if (offset == OF_BAD_ADDR) {
	380	pr_debug("OF: not found !\n");
	381	return 1;
	382	}
	383	memcpy(addr, ranges + na, 4 * pna);
	384
	385	finish:
	386	of_dump_addr("OF: parent translation for:", addr, pna);
	387	pr_debug("OF: with offset: %llx\n", (unsigned long long)offset);
	388
	389	/* Translate it into parent bus space */
	390	return pbus->translate(addr, offset, pna);
	391	}
	392
	393	/*
	394	* Translate an address from the device-tree into a CPU physical address,
	395	* this walks up the tree and applies the various bus mappings on the
	396	* way.
	397	*
	398	* Note: We consider that crossing any level with #size-cells == 0 to mean
	399	* that translation is impossible (that is we are not dealing with a value
	400	* that can be mapped to a cpu physical address). This is not really specified
	401	* that way, but this is traditionally the way IBM at least do things
	402	*/
0131d897	403	u64 __of_translate_address(struct device_node dev, const __be32 in_addr,
dbbdee94 GL	404	const char *rprop)
	405	{
	406	struct device_node *parent = NULL;
	407	struct of_bus bus, pbus;
	408	u32 addr[OF_MAX_ADDR_CELLS];
	409	int na, ns, pna, pns;
	410	u64 result = OF_BAD_ADDR;
	411
	412	pr_debug("OF: translation for device %s \n", dev->full_name);
	413
	414	/* Increase refcount at current level */
	415	of_node_get(dev);
	416
	417	/* Get parent & match bus type */
	418	parent = of_get_parent(dev);
	419	if (parent == NULL)
	420	goto bail;
	421	bus = of_match_bus(parent);
	422
	423	/* Cound address cells & copy address locally */
	424	bus->count_cells(dev, &na, &ns);
	425	if (!OF_CHECK_COUNTS(na, ns)) {
	426	printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
	427	dev->full_name);
	428	goto bail;
	429	}
	430	memcpy(addr, in_addr, na * 4);
	431
	432	pr_debug("OF: bus is %s (na=%d, ns=%d) on %s\n",
	433	bus->name, na, ns, parent->full_name);
	434	of_dump_addr("OF: translating address:", addr, na);
	435
	436	/* Translate */
	437	for (;;) {
	438	/* Switch to parent bus */
	439	of_node_put(dev);
	440	dev = parent;
	441	parent = of_get_parent(dev);
	442
	443	/* If root, we have finished */
	444	if (parent == NULL) {
	445	pr_debug("OF: reached root node\n");
	446	result = of_read_number(addr, na);
	447	break;
	448	}
	449
	450	/* Get new parent bus and counts */
	451	pbus = of_match_bus(parent);
	452	pbus->count_cells(dev, &pna, &pns);
	453	if (!OF_CHECK_COUNTS(pna, pns)) {
	454	printk(KERN_ERR "prom_parse: Bad cell count for %s\n",
	455	dev->full_name);
	456	break;
	457	}
	458
	459	pr_debug("OF: parent bus is %s (na=%d, ns=%d) on %s\n",
	460	pbus->name, pna, pns, parent->full_name);
	461
	462	/* Apply bus translation */
	463	if (of_translate_one(dev, bus, pbus, addr, na, ns, pna, rprop))
	464	break;
	465
	466	/* Complete the move up one level */
	467	na = pna;
468	ns = pns;
469	bus = pbus;
470
471	of_dump_addr("OF: one level translation:", addr, na);
472	}
473	bail:
474	of_node_put(parent);
475	of_node_put(dev);
476
477	return result;
478	}
479
0131d897	480	u64 of_translate_address(struct device_node dev, const __be32 in_addr)
dbbdee94 GL	481	{
	482	return __of_translate_address(dev, in_addr, "ranges");
	483	}
	484	EXPORT_SYMBOL(of_translate_address);
	485
0131d897	486	u64 of_translate_dma_address(struct device_node dev, const __be32 in_addr)
dbbdee94 GL	487	{
	488	return __of_translate_address(dev, in_addr, "dma-ranges");
	489	}
	490	EXPORT_SYMBOL(of_translate_dma_address);
	491
0131d897	492	const __be32 of_get_address(struct device_node dev, int index, u64 *size,
dbbdee94 GL	493	unsigned int *flags)
dbbdee94 GL	494	{
0131d897	495	const __be32 *prop;
dbbdee94 GL	496	unsigned int psize;
	497	struct device_node *parent;
	498	struct of_bus *bus;
	499	int onesize, i, na, ns;
	500
	501	/* Get parent & match bus type */
	502	parent = of_get_parent(dev);
	503	if (parent == NULL)
	504	return NULL;
	505	bus = of_match_bus(parent);
	506	bus->count_cells(dev, &na, &ns);
	507	of_node_put(parent);
	508	if (!OF_CHECK_COUNTS(na, ns))
	509	return NULL;
	510
	511	/* Get "reg" or "assigned-addresses" property */
	512	prop = of_get_property(dev, bus->addresses, &psize);
	513	if (prop == NULL)
	514	return NULL;
	515	psize /= 4;
	516
	517	onesize = na + ns;
	518	for (i = 0; psize >= onesize; psize -= onesize, prop += onesize, i++)
	519	if (i == index) {
	520	if (size)
	521	*size = of_read_number(prop + na, ns);
	522	if (flags)
	523	*flags = bus->get_flags(prop);
	524	return prop;
	525	}
	526	return NULL;
	527	}
	528	EXPORT_SYMBOL(of_get_address);
	529
0131d897 SAS	530	static int __of_address_to_resource(struct device_node *dev,
0131d897 SAS	531	const __be32 *addrp, u64 size, unsigned int flags,
dbbdee94	532	struct resource *r)
1f5bef30 GL	533	{
	534	u64 taddr;
	535
	536	if ((flags & (IORESOURCE_IO \| IORESOURCE_MEM)) == 0)
	537	return -EINVAL;
	538	taddr = of_translate_address(dev, addrp);
	539	if (taddr == OF_BAD_ADDR)
	540	return -EINVAL;
	541	memset(r, 0, sizeof(struct resource));
	542	if (flags & IORESOURCE_IO) {
	543	unsigned long port;
	544	port = pci_address_to_pio(taddr);
	545	if (port == (unsigned long)-1)
	546	return -EINVAL;
	547	r->start = port;
	548	r->end = port + size - 1;
	549	} else {
	550	r->start = taddr;
	551	r->end = taddr + size - 1;
	552	}
	553	r->flags = flags;
d3571c3a	554	r->name = dev->full_name;
1f5bef30 GL	555	return 0;
	556	}
	557
	558	/**
	559	* of_address_to_resource - Translate device tree address and return as resource
	560	*
	561	* Note that if your address is a PIO address, the conversion will fail if
	562	* the physical address can't be internally converted to an IO token with
	563	* pci_address_to_pio(), that is because it's either called to early or it
	564	* can't be matched to any host bridge IO space
	565	*/
	566	int of_address_to_resource(struct device_node *dev, int index,
	567	struct resource *r)
	568	{
0131d897	569	const __be32 *addrp;
1f5bef30 GL	570	u64 size;
	571	unsigned int flags;
	572
	573	addrp = of_get_address(dev, index, &size, &flags);
	574	if (addrp == NULL)
	575	return -EINVAL;
	576	return __of_address_to_resource(dev, addrp, size, flags, r);
	577	}
	578	EXPORT_SYMBOL_GPL(of_address_to_resource);
	579
90e33f62 GL	580	struct device_node of_find_matching_node_by_address(struct device_node from,
	581	const struct of_device_id *matches,
	582	u64 base_address)
	583	{
	584	struct device_node *dn = of_find_matching_node(from, matches);
	585	struct resource res;
	586
	587	while (dn) {
	588	if (of_address_to_resource(dn, 0, &res))
	589	continue;
	590	if (res.start == base_address)
	591	return dn;
	592	dn = of_find_matching_node(dn, matches);
	593	}
	594
	595	return NULL;
	596	}
	597
1f5bef30	598
6b884a8d GL	599	/**
	600	* of_iomap - Maps the memory mapped IO for a given device_node
	601	* @device: the device whose io range will be mapped
	602	* @index: index of the io range
	603	*
	604	* Returns a pointer to the mapped memory
	605	*/
	606	void __iomem of_iomap(struct device_node np, int index)
	607	{
	608	struct resource res;
	609
	610	if (of_address_to_resource(np, index, &res))
	611	return NULL;
	612
	613	return ioremap(res.start, 1 + res.end - res.start);
	614	}
	615	EXPORT_SYMBOL(of_iomap);