path: root/arch/sparc64/kernel/of_device.c

#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>

void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
{
	unsigned long ret = res->start + offset;
	struct resource *r;

	if (res->flags & IORESOURCE_MEM)
		r = request_mem_region(ret, size, name);
	else
		r = request_region(ret, size, name);
	if (!r)
		ret = 0;

	return (void __iomem *) ret;
}
EXPORT_SYMBOL(of_ioremap);

void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
{
	if (res->flags & IORESOURCE_MEM)
		release_mem_region((unsigned long) base, size);
	else
		release_region((unsigned long) base, size);
}
EXPORT_SYMBOL(of_iounmap);

static int node_match(struct device *dev, void *data)
{
	struct of_device *op = to_of_device(dev);
	struct device_node *dp = data;

	return (op->node == dp);
}

struct of_device *of_find_device_by_node(struct device_node *dp)
{
	struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
					     dp, node_match);

	if (dev)
		return to_of_device(dev);

	return NULL;
}
EXPORT_SYMBOL(of_find_device_by_node);

#ifdef CONFIG_PCI
struct bus_type ebus_bus_type;
EXPORT_SYMBOL(ebus_bus_type);
#endif

#ifdef CONFIG_SBUS
struct bus_type sbus_bus_type;
EXPORT_SYMBOL(sbus_bus_type);
#endif

struct bus_type of_platform_bus_type;
EXPORT_SYMBOL(of_platform_bus_type);

static inline u64 of_read_addr(const u32 *cell, int size)
{
	u64 r = 0;
	while (size--)
		r = (r << 32) | *(cell++);
	return r;
}

static void __init get_cells(struct device_node *dp,
			     int *addrc, int *sizec)
{
	if (addrc)
		*addrc = of_n_addr_cells(dp);
	if (sizec)
		*sizec = of_n_size_cells(dp);
}

/* Max address size we deal with */
#define OF_MAX_ADDR_CELLS	4

struct of_bus {
	const char	*name;
	const char	*addr_prop_name;
	int		(*match)(struct device_node *parent);
	void		(*count_cells)(struct device_node *child,
				       int *addrc, int *sizec);
	int		(*map)(u32 *addr, const u32 *range,
			       int na, int ns, int pna);
	unsigned long	(*get_flags)(const u32 *addr, unsigned long);
};

/*
 * Default translator (generic bus)
 */

static void of_bus_default_count_cells(struct device_node *dev,
				       int *addrc, int *sizec)
{
	get_cells(dev, addrc, sizec);
}

/* Make sure the least significant 64-bits are in-range.  Even
 * for 3 or 4 cell values it is a good enough approximation.
 */
static int of_out_of_range(const u32 *addr, const u32 *base,
			   const u32 *size, int na, int ns)
{
	u64 a = of_read_addr(addr, na);
	u64 b = of_read_addr(base, na);

	if (a < b)
		return 1;

	b += of_read_addr(size, ns);
	if (a >= b)
		return 1;

	return 0;
}

static int of_bus_default_map(u32 *addr, const u32 *range,
			      int na, int ns, int pna)
{
	u32 result[OF_MAX_ADDR_CELLS];
	int i;

	if (ns > 2) {
		printk("of_device: Cannot handle size cells (%d) > 2.", ns);
		return -EINVAL;
	}

	if (of_out_of_range(addr, range, range + na + pna, na, ns))
		return -EINVAL;

	/* Start with the parent range base.  */
	memcpy(result, range + na, pna * 4);

	/* Add in the child address offset.  */
	for (i = 0; i < na; i++)
		result[pna - 1 - i] +=
			(addr[na - 1 - i] -
			 range[na - 1 - i]);

	memcpy(addr, result, pna * 4);

	return 0;
}

static unsigned<