drivers/core/regmap.c - u-boot-mtk - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (c) 2015 Google, Inc
  * Written by Simon Glass <sjg@chromium.org>
  */

 #include <common.h>
 #include <dm.h>
 #include <errno.h>
 #include <linux/libfdt.h>
 #include <malloc.h>
 #include <mapmem.h>
 #include <regmap.h>
 #include <asm/io.h>
 #include <dm/of_addr.h>
 #include <linux/ioport.h>

 DECLARE_GLOBAL_DATA_PTR;

 /**
  * regmap_alloc() - Allocate a regmap with a given number of ranges.
  *
  * @count: Number of ranges to be allocated for the regmap.
  * Return: A pointer to the newly allocated regmap, or NULL on error.
  */
 static struct regmap *regmap_alloc(int count)
 {
 	struct regmap *map;

 	map = malloc(sizeof(*map) + sizeof(map->ranges[0]) * count);
 	if (!map)
 		return NULL;
 	map->range_count = count;

 	return map;
 }

 #if CONFIG_IS_ENABLED(OF_PLATDATA)
 int regmap_init_mem_platdata(struct udevice *dev, fdt_val_t *reg, int count,
 			     struct regmap **mapp)
 {
 	struct regmap_range *range;
 	struct regmap *map;

 	map = regmap_alloc(count);
 	if (!map)
 		return -ENOMEM;

 	for (range = map->ranges; count > 0; reg += 2, range++, count--) {
 		range->start = *reg;
 		range->size = reg[1];
 	}

 	*mapp = map;

 	return 0;
 }
 #else
 /**
  * init_range() - Initialize a single range of a regmap
  * @node:     Device node that will use the map in question
  * @range:    Pointer to a regmap_range structure that will be initialized
  * @addr_len: The length of the addr parts of the reg property
  * @size_len: The length of the size parts of the reg property
  * @index:    The index of the range to initialize
  *
  * This function will read the necessary 'reg' information from the device tree
  * (the 'addr' part, and the 'length' part), and initialize the range in
  * quesion.
  *
  * Return: 0 if OK, -ve on error
  */
 static int init_range(ofnode node, struct regmap_range *range, int addr_len,
 		      int size_len, int index)
 {
 	fdt_size_t sz;
 	struct resource r;

 	if (of_live_active()) {
 		int ret;

 		ret = of_address_to_resource(ofnode_to_np(node),
 					     index, &r);
 		if (ret) {
 			debug("%s: Could not read resource of range %d (ret = %d)\n",
 			      ofnode_get_name(node), index, ret);
 			return ret;
 		}

 		range->start = r.start;
 		range->size = r.end - r.start + 1;
 	} else {
 		int offset = ofnode_to_offset(node);

 		range->start = fdtdec_get_addr_size_fixed(gd->fdt_blob, offset,
 							  "reg", index,
 							  addr_len, size_len,
 							  &sz, true);
 		if (range->start == FDT_ADDR_T_NONE) {
 			debug("%s: Could not read start of range %d\n",
 			      ofnode_get_name(node), index);
 			return -EINVAL;
 		}

 		range->size = sz;
 	}

 	return 0;
 }

 int regmap_init_mem_index(ofnode node, struct regmap **mapp, int index)
 {
 	struct regmap *map;
 	int addr_len, size_len;
 	int ret;

 	addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
 	if (addr_len < 0) {
 		debug("%s: Error while reading the addr length (ret = %d)\n",
 		      ofnode_get_name(node), addr_len);
 		return addr_len;
 	}

 	size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
 	if (size_len < 0) {
 		debug("%s: Error while reading the size length: (ret = %d)\n",
 		      ofnode_get_name(node), size_len);
 		return size_len;
 	}

 	map = regmap_alloc(1);
 	if (!map)
 		return -ENOMEM;

 	ret = init_range(node, map->ranges, addr_len, size_len, index);
 	if (ret)
 		return ret;

 	if (ofnode_read_bool(node, "little-endian"))
 		map->endianness = REGMAP_LITTLE_ENDIAN;
 	else if (ofnode_read_bool(node, "big-endian"))
 		map->endianness = REGMAP_BIG_ENDIAN;
 	else if (ofnode_read_bool(node, "native-endian"))
 		map->endianness = REGMAP_NATIVE_ENDIAN;
 	else /* Default: native endianness */
 		map->endianness = REGMAP_NATIVE_ENDIAN;

 	*mapp = map;

 	return ret;
 }

 int regmap_init_mem(ofnode node, struct regmap **mapp)
 {
 	struct regmap_range *range;
 	struct regmap *map;
 	int count;
 	int addr_len, size_len, both_len;
 	int len;
 	int index;

 	addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
 	if (addr_len < 0) {
 		debug("%s: Error while reading the addr length (ret = %d)\n",
 		      ofnode_get_name(node), addr_len);
 		return addr_len;
 	}

 	size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
 	if (size_len < 0) {
 		debug("%s: Error while reading the size length: (ret = %d)\n",
 		      ofnode_get_name(node), size_len);
 		return size_len;
 	}

 	both_len = addr_len + size_len;
 	if (!both_len) {
 		debug("%s: Both addr and size length are zero\n",
 		      ofnode_get_name(node));
 		return -EINVAL;
 	}

 	len = ofnode_read_size(node, "reg");
 	if (len < 0) {
 		debug("%s: Error while reading reg size (ret = %d)\n",
 		      ofnode_get_name(node), len);
 		return len;
 	}
 	len /= sizeof(fdt32_t);
 	count = len / both_len;
 	if (!count) {
 		debug("%s: Not enough data in reg property\n",
 		      ofnode_get_name(node));
 		return -EINVAL;
 	}

 	map = regmap_alloc(count);
 	if (!map)
 		return -ENOMEM;

 	for (range = map->ranges, index = 0; count > 0;
 	     count--, range++, index++) {
 		int ret = init_range(node, range, addr_len, size_len, index);

 		if (ret)
 			return ret;
 	}

 	if (ofnode_read_bool(node, "little-endian"))
 		map->endianness = REGMAP_LITTLE_ENDIAN;
 	else if (ofnode_read_bool(node, "big-endian"))
 		map->endianness = REGMAP_BIG_ENDIAN;
 	else if (ofnode_read_bool(node, "native-endian"))
 		map->endianness = REGMAP_NATIVE_ENDIAN;
 	else /* Default: native endianness */
 		map->endianness = REGMAP_NATIVE_ENDIAN;

 	*mapp = map;

 	return 0;
 }
 #endif

 void *regmap_get_range(struct regmap *map, unsigned int range_num)
 {
 	struct regmap_range *range;

 	if (range_num >= map->range_count)
 		return NULL;
 	range = &map->ranges[range_num];

 	return map_sysmem(range->start, range->size);
 }

 int regmap_uninit(struct regmap *map)
 {
 	free(map);

 	return 0;
 }

 static inline u8 __read_8(u8 *addr, enum regmap_endianness_t endianness)
 {
 	return readb(addr);
 }

 static inline u16 __read_16(u16 *addr, enum regmap_endianness_t endianness)
 {
 	switch (endianness) {
 	case REGMAP_LITTLE_ENDIAN:
 		return in_le16(addr);
 	case REGMAP_BIG_ENDIAN:
 		return in_be16(addr);
 	case REGMAP_NATIVE_ENDIAN:
 		return readw(addr);
 	}

 	return readw(addr);
 }

 static inline u32 __read_32(u32 *addr, enum regmap_endianness_t endianness)
 {
 	switch (endianness) {
 	case REGMAP_LITTLE_ENDIAN:
 		return in_le32(addr);
 	case REGMAP_BIG_ENDIAN:
 		return in_be32(addr);
 	case REGMAP_NATIVE_ENDIAN:
 		return readl(addr);
 	}

 	return readl(addr);
 }

 #if defined(in_le64) && defined(in_be64) && defined(readq)
 static inline u64 __read_64(u64 *addr, enum regmap_endianness_t endianness)
 {
 	switch (endianness) {
 	case REGMAP_LITTLE_ENDIAN:
 		return in_le64(addr);
 	case REGMAP_BIG_ENDIAN:
 		return in_be64(addr);
 	case REGMAP_NATIVE_ENDIAN:
 		return readq(addr);
 	}

 	return readq(addr);
 }
 #endif

 int regmap_raw_read_range(struct regmap *map, uint range_num, uint offset,
 			  void *valp, size_t val_len)
 {
 	struct regmap_range *range;
 	void *ptr;

 	if (range_num >= map->range_count) {
 		debug("%s: range index %d larger than range count\n",
 		      __func__, range_num);
 		return -ERANGE;
 	}
 	range = &map->ranges[range_num];

 	ptr = map_physmem(range->start + offset, val_len, MAP_NOCACHE);

 	if (offset + val_len > range->size) {
 		debug("%s: offset/size combination invalid\n", __func__);
 		return -ERANGE;
 	}

 	switch (val_len) {
 	case REGMAP_SIZE_8:
 		*((u8 *)valp) = __read_8(ptr, map->endianness);
 		break;
 	case REGMAP_SIZE_16:
 		*((u16 *)valp) = __read_16(ptr, map->endianness);
 		break;
 	case REGMAP_SIZE_32:
 		*((u32 *)valp) = __read_32(ptr, map->endianness);
 		break;
 #if defined(in_le64) && defined(in_be64) && defined(readq)
 	case REGMAP_SIZE_64:
 		*((u64 *)valp) = __read_64(ptr, map->endianness);
 		break;
 #endif
 	default:
 		debug("%s: regmap size %zu unknown\n", __func__, val_len);
 		return -EINVAL;
 	}

 	return 0;
 }

 int regmap_raw_read(struct regmap *map, uint offset, void *valp, size_t val_len)
 {
 	return regmap_raw_read_range(map, 0, offset, valp, val_len);
 }

 int regmap_read(struct regmap *map, uint offset, uint *valp)
 {
 	return regmap_raw_read(map, offset, valp, REGMAP_SIZE_32);
 }

 static inline void __write_8(u8 *addr, const u8 *val,
 			     enum regmap_endianness_t endianness)
 {
 	writeb(*val, addr);
 }

 static inline void __write_16(u16 *addr, const u16 *val,
 			      enum regmap_endianness_t endianness)
 {
 	switch (endianness) {
 	case REGMAP_NATIVE_ENDIAN:
 		writew(*val, addr);
 		break;
 	case REGMAP_LITTLE_ENDIAN:
 		out_le16(addr, *val);
 		break;
 	case REGMAP_BIG_ENDIAN:
 		out_be16(addr, *val);
 		break;
 	}
 }

 static inline void __write_32(u32 *addr, const u32 *val,
 			      enum regmap_endianness_t endianness)
 {
 	switch (endianness) {
 	case REGMAP_NATIVE_ENDIAN:
 		writel(*val, addr);
 		break;
 	case REGMAP_LITTLE_ENDIAN:
 		out_le32(addr, *val);
 		break;
 	case REGMAP_BIG_ENDIAN:
 		out_be32(addr, *val);
 		break;
 	}
 }

 #if defined(out_le64) && defined(out_be64) && defined(writeq)
 static inline void __write_64(u64 *addr, const u64 *val,
 			      enum regmap_endianness_t endianness)
 {
 	switch (endianness) {
 	case REGMAP_NATIVE_ENDIAN:
 		writeq(*val, addr);
 		break;
 	case REGMAP_LITTLE_ENDIAN:
 		out_le64(addr, *val);
 		break;
 	case REGMAP_BIG_ENDIAN:
 		out_be64(addr, *val);
 		break;
 	}
 }
 #endif

 int regmap_raw_write_range(struct regmap *map, uint range_num, uint offset,
 			   const void *val, size_t val_len)
 {
 	struct regmap_range *range;
 	void *ptr;

 	if (range_num >= map->range_count) {
 		debug("%s: range index %d larger than range count\n",
 		      __func__, range_num);
 		return -ERANGE;
 	}
 	range = &map->ranges[range_num];

 	ptr = map_physmem(range->start + offset, val_len, MAP_NOCACHE);

 	if (offset + val_len > range->size) {
 		debug("%s: offset/size combination invalid\n", __func__);
 		return -ERANGE;
 	}

 	switch (val_len) {
 	case REGMAP_SIZE_8:
 		__write_8(ptr, val, map->endianness);
 		break;
 	case REGMAP_SIZE_16:
 		__write_16(ptr, val, map->endianness);
 		break;
 	case REGMAP_SIZE_32:
 		__write_32(ptr, val, map->endianness);
 		break;
 #if defined(out_le64) && defined(out_be64) && defined(writeq)
 	case REGMAP_SIZE_64:
 		__write_64(ptr, val, map->endianness);
 		break;
 #endif
 	default:
 		debug("%s: regmap size %zu unknown\n", __func__, val_len);
 		return -EINVAL;
 	}

 	return 0;
 }

 int regmap_raw_write(struct regmap *map, uint offset, const void *val,
 		     size_t val_len)
 {
 	return regmap_raw_write_range(map, 0, offset, val, val_len);
 }

 int regmap_write(struct regmap *map, uint offset, uint val)
 {
 	return regmap_raw_write(map, offset, &val, REGMAP_SIZE_32);
 }

 int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val)
 {
 	uint reg;
 	int ret;

 	ret = regmap_read(map, offset, &reg);
 	if (ret)
 		return ret;

 	reg &= ~mask;

 	return regmap_write(map, offset, reg | val);
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* Copyright (c) 2015 Google, Inc
	* Written by Simon Glass <sjg@chromium.org>
	*/

	#include <common.h>
	#include <dm.h>
	#include <errno.h>
	#include <linux/libfdt.h>
	#include <malloc.h>
	#include <mapmem.h>
	#include <regmap.h>
	#include <asm/io.h>
	#include <dm/of_addr.h>
	#include <linux/ioport.h>

	DECLARE_GLOBAL_DATA_PTR;

	/**
	* regmap_alloc() - Allocate a regmap with a given number of ranges.
	*
	* @count: Number of ranges to be allocated for the regmap.
	* Return: A pointer to the newly allocated regmap, or NULL on error.
	*/
	static struct regmap *regmap_alloc(int count)
	{
	struct regmap *map;

	map = malloc(sizeof(map) + sizeof(map->ranges[0]) count);
	if (!map)
	return NULL;
	map->range_count = count;

	return map;
	}

	#if CONFIG_IS_ENABLED(OF_PLATDATA)
	int regmap_init_mem_platdata(struct udevice dev, fdt_val_t reg, int count,
	struct regmap **mapp)
	{
	struct regmap_range *range;
	struct regmap *map;

	map = regmap_alloc(count);
	if (!map)
	return -ENOMEM;

	for (range = map->ranges; count > 0; reg += 2, range++, count--) {
	range->start = *reg;
	range->size = reg[1];
	}

	*mapp = map;

	return 0;
	}
	#else
	/**
	* init_range() - Initialize a single range of a regmap
	* @node: Device node that will use the map in question
	* @range: Pointer to a regmap_range structure that will be initialized
	* @addr_len: The length of the addr parts of the reg property
	* @size_len: The length of the size parts of the reg property
	* @index: The index of the range to initialize
	*
	* This function will read the necessary 'reg' information from the device tree
	* (the 'addr' part, and the 'length' part), and initialize the range in
	* quesion.
	*
	* Return: 0 if OK, -ve on error
	*/
	static int init_range(ofnode node, struct regmap_range *range, int addr_len,
	int size_len, int index)
	{
	fdt_size_t sz;
	struct resource r;

	if (of_live_active()) {
	int ret;

	ret = of_address_to_resource(ofnode_to_np(node),
	index, &r);
	if (ret) {
	debug("%s: Could not read resource of range %d (ret = %d)\n",
	ofnode_get_name(node), index, ret);
	return ret;
	}

	range->start = r.start;
	range->size = r.end - r.start + 1;
	} else {
	int offset = ofnode_to_offset(node);

	range->start = fdtdec_get_addr_size_fixed(gd->fdt_blob, offset,
	"reg", index,
	addr_len, size_len,
	&sz, true);
	if (range->start == FDT_ADDR_T_NONE) {
	debug("%s: Could not read start of range %d\n",
	ofnode_get_name(node), index);
	return -EINVAL;
	}

	range->size = sz;
	}

	return 0;
	}

	int regmap_init_mem_index(ofnode node, struct regmap **mapp, int index)
	{
	struct regmap *map;
	int addr_len, size_len;
	int ret;

	addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
	if (addr_len < 0) {
	debug("%s: Error while reading the addr length (ret = %d)\n",
	ofnode_get_name(node), addr_len);
	return addr_len;
	}

	size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
	if (size_len < 0) {
	debug("%s: Error while reading the size length: (ret = %d)\n",
	ofnode_get_name(node), size_len);
	return size_len;
	}

	map = regmap_alloc(1);
	if (!map)
	return -ENOMEM;

	ret = init_range(node, map->ranges, addr_len, size_len, index);
	if (ret)
	return ret;

	if (ofnode_read_bool(node, "little-endian"))
	map->endianness = REGMAP_LITTLE_ENDIAN;
	else if (ofnode_read_bool(node, "big-endian"))
	map->endianness = REGMAP_BIG_ENDIAN;
	else if (ofnode_read_bool(node, "native-endian"))
	map->endianness = REGMAP_NATIVE_ENDIAN;
	else /* Default: native endianness */
	map->endianness = REGMAP_NATIVE_ENDIAN;

	*mapp = map;

	return ret;
	}

	int regmap_init_mem(ofnode node, struct regmap **mapp)
	{
	struct regmap_range *range;
	struct regmap *map;
	int count;
	int addr_len, size_len, both_len;
	int len;
	int index;

	addr_len = ofnode_read_simple_addr_cells(ofnode_get_parent(node));
	if (addr_len < 0) {
	debug("%s: Error while reading the addr length (ret = %d)\n",
	ofnode_get_name(node), addr_len);
	return addr_len;
	}

	size_len = ofnode_read_simple_size_cells(ofnode_get_parent(node));
	if (size_len < 0) {
	debug("%s: Error while reading the size length: (ret = %d)\n",
	ofnode_get_name(node), size_len);
	return size_len;
	}

	both_len = addr_len + size_len;
	if (!both_len) {
	debug("%s: Both addr and size length are zero\n",
	ofnode_get_name(node));
	return -EINVAL;
	}

	len = ofnode_read_size(node, "reg");
	if (len < 0) {
	debug("%s: Error while reading reg size (ret = %d)\n",
	ofnode_get_name(node), len);
	return len;
	}
	len /= sizeof(fdt32_t);
	count = len / both_len;
	if (!count) {
	debug("%s: Not enough data in reg property\n",
	ofnode_get_name(node));
	return -EINVAL;
	}

	map = regmap_alloc(count);
	if (!map)
	return -ENOMEM;

	for (range = map->ranges, index = 0; count > 0;
	count--, range++, index++) {
	int ret = init_range(node, range, addr_len, size_len, index);

	if (ret)
	return ret;
	}

	if (ofnode_read_bool(node, "little-endian"))
	map->endianness = REGMAP_LITTLE_ENDIAN;
	else if (ofnode_read_bool(node, "big-endian"))
	map->endianness = REGMAP_BIG_ENDIAN;
	else if (ofnode_read_bool(node, "native-endian"))
	map->endianness = REGMAP_NATIVE_ENDIAN;
	else /* Default: native endianness */
	map->endianness = REGMAP_NATIVE_ENDIAN;

	*mapp = map;

	return 0;
	}
	#endif

	void regmap_get_range(struct regmap map, unsigned int range_num)
	{
	struct regmap_range *range;

	if (range_num >= map->range_count)
	return NULL;
	range = &map->ranges[range_num];

	return map_sysmem(range->start, range->size);
	}

	int regmap_uninit(struct regmap *map)
	{
	free(map);

	return 0;
	}

	static inline u8 __read_8(u8 *addr, enum regmap_endianness_t endianness)
	{
	return readb(addr);
	}

	static inline u16 __read_16(u16 *addr, enum regmap_endianness_t endianness)
	{
	switch (endianness) {
	case REGMAP_LITTLE_ENDIAN:
	return in_le16(addr);
	case REGMAP_BIG_ENDIAN:
	return in_be16(addr);
	case REGMAP_NATIVE_ENDIAN:
	return readw(addr);
	}

	return readw(addr);
	}

	static inline u32 __read_32(u32 *addr, enum regmap_endianness_t endianness)
	{
	switch (endianness) {
	case REGMAP_LITTLE_ENDIAN:
	return in_le32(addr);
	case REGMAP_BIG_ENDIAN:
	return in_be32(addr);
	case REGMAP_NATIVE_ENDIAN:
	return readl(addr);
	}

	return readl(addr);
	}

	#if defined(in_le64) && defined(in_be64) && defined(readq)
	static inline u64 __read_64(u64 *addr, enum regmap_endianness_t endianness)
	{
	switch (endianness) {
	case REGMAP_LITTLE_ENDIAN:
	return in_le64(addr);
	case REGMAP_BIG_ENDIAN:
	return in_be64(addr);
	case REGMAP_NATIVE_ENDIAN:
	return readq(addr);
	}

	return readq(addr);
	}
	#endif

	int regmap_raw_read_range(struct regmap *map, uint range_num, uint offset,
	void *valp, size_t val_len)
	{
	struct regmap_range *range;
	void *ptr;

	if (range_num >= map->range_count) {
	debug("%s: range index %d larger than range count\n",
	__func__, range_num);
	return -ERANGE;
	}
	range = &map->ranges[range_num];

	ptr = map_physmem(range->start + offset, val_len, MAP_NOCACHE);

	if (offset + val_len > range->size) {
	debug("%s: offset/size combination invalid\n", __func__);
	return -ERANGE;
	}

	switch (val_len) {
	case REGMAP_SIZE_8:
	((u8 )valp) = __read_8(ptr, map->endianness);
	break;
	case REGMAP_SIZE_16:
	((u16 )valp) = __read_16(ptr, map->endianness);
	break;
	case REGMAP_SIZE_32:
	((u32 )valp) = __read_32(ptr, map->endianness);
	break;
	#if defined(in_le64) && defined(in_be64) && defined(readq)
	case REGMAP_SIZE_64:
	((u64 )valp) = __read_64(ptr, map->endianness);
	break;
	#endif
	default:
	debug("%s: regmap size %zu unknown\n", __func__, val_len);
	return -EINVAL;
	}

	return 0;
	}

	int regmap_raw_read(struct regmap map, uint offset, void valp, size_t val_len)
	{
	return regmap_raw_read_range(map, 0, offset, valp, val_len);
	}

	int regmap_read(struct regmap map, uint offset, uint valp)
	{
	return regmap_raw_read(map, offset, valp, REGMAP_SIZE_32);
	}

	static inline void __write_8(u8 addr, const u8 val,
	enum regmap_endianness_t endianness)
	{
	writeb(*val, addr);
	}

	static inline void __write_16(u16 addr, const u16 val,
	enum regmap_endianness_t endianness)
	{
	switch (endianness) {
	case REGMAP_NATIVE_ENDIAN:
	writew(*val, addr);
	break;
	case REGMAP_LITTLE_ENDIAN:
	out_le16(addr, *val);
	break;
	case REGMAP_BIG_ENDIAN:
	out_be16(addr, *val);
	break;
	}
	}

	static inline void __write_32(u32 addr, const u32 val,
	enum regmap_endianness_t endianness)
	{
	switch (endianness) {
	case REGMAP_NATIVE_ENDIAN:
	writel(*val, addr);
	break;
	case REGMAP_LITTLE_ENDIAN:
	out_le32(addr, *val);
	break;
	case REGMAP_BIG_ENDIAN:
	out_be32(addr, *val);
	break;
	}
	}

	#if defined(out_le64) && defined(out_be64) && defined(writeq)
	static inline void __write_64(u64 addr, const u64 val,
	enum regmap_endianness_t endianness)
	{
	switch (endianness) {
	case REGMAP_NATIVE_ENDIAN:
	writeq(*val, addr);
	break;
	case REGMAP_LITTLE_ENDIAN:
	out_le64(addr, *val);
	break;
	case REGMAP_BIG_ENDIAN:
	out_be64(addr, *val);
	break;
	}
	}
	#endif

	int regmap_raw_write_range(struct regmap *map, uint range_num, uint offset,
	const void *val, size_t val_len)
	{
	struct regmap_range *range;
	void *ptr;

	if (range_num >= map->range_count) {
	debug("%s: range index %d larger than range count\n",
	__func__, range_num);
	return -ERANGE;
	}
	range = &map->ranges[range_num];

	ptr = map_physmem(range->start + offset, val_len, MAP_NOCACHE);

	if (offset + val_len > range->size) {
	debug("%s: offset/size combination invalid\n", __func__);
	return -ERANGE;
	}

	switch (val_len) {
	case REGMAP_SIZE_8:
	__write_8(ptr, val, map->endianness);
	break;
	case REGMAP_SIZE_16:
	__write_16(ptr, val, map->endianness);
	break;
	case REGMAP_SIZE_32:
	__write_32(ptr, val, map->endianness);
	break;
	#if defined(out_le64) && defined(out_be64) && defined(writeq)
	case REGMAP_SIZE_64:
	__write_64(ptr, val, map->endianness);
	break;
	#endif
	default:
	debug("%s: regmap size %zu unknown\n", __func__, val_len);
	return -EINVAL;
	}

	return 0;
	}

	int regmap_raw_write(struct regmap map, uint offset, const void val,
	size_t val_len)
	{
	return regmap_raw_write_range(map, 0, offset, val, val_len);
	}

	int regmap_write(struct regmap *map, uint offset, uint val)
	{
	return regmap_raw_write(map, offset, &val, REGMAP_SIZE_32);
	}

	int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val)
	{
	uint reg;
	int ret;

	ret = regmap_read(map, offset, &reg);
	if (ret)
	return ret;

	reg &= ~mask;

	return regmap_write(map, offset, reg \| val);
	}