// SPDX-License-Identifier: GPL-2.0
//
// Register map access API
//
// Copyright 2011 Wolfson Microelectronics plc
//
// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/property.h>
#include <linux/rbtree.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/log2.h>
#include <linux/hwspinlock.h>
#include <linux/unaligned.h>
#define CREATE_TRACE_POINTS
#include "trace.h"
#include "internal.h"
/*
* Sometimes for failures during very early init the trace
* infrastructure isn ' t available early enough to be used . For this
* sort of problem defining LOG_DEVICE will add printks for basic
* register I / O on a specific device .
*/
#undef LOG_DEVICE
#ifdef LOG_DEVICE
static inline bool regmap_should_log(struct regmap *map)
{
return (map->dev && strcmp(dev_name(map->dev), LOG_DEVICE) == 0 );
}
#else
static inline bool regmap_should_log(struct regmap *map) { return false ; }
#endif
static int _regmap_update_bits(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change, bool force_write);
static int _regmap_bus_reg_read(void *context, unsigned int reg,
unsigned int *val);
static int _regmap_bus_read(void *context, unsigned int reg,
unsigned int *val);
static int _regmap_bus_formatted_write(void *context, unsigned int reg,
unsigned int val);
static int _regmap_bus_reg_write(void *context, unsigned int reg,
unsigned int val);
static int _regmap_bus_raw_write(void *context, unsigned int reg,
unsigned int val);
bool regmap_reg_in_ranges(unsigned int reg,
const struct regmap_range *ranges,
unsigned int nranges)
{
const struct regmap_range *r;
int i;
for (i = 0 , r = ranges; i < nranges; i++, r++)
if (regmap_reg_in_range(reg, r))
return true ;
return false ;
}
EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
bool regmap_check_range_table(struct regmap *map, unsigned int reg,
const struct regmap_access_table *table)
{
/* Check "no ranges" first */
if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges))
return false ;
/* In case zero "yes ranges" are supplied, any reg is OK */
if (!table->n_yes_ranges)
return true ;
return regmap_reg_in_ranges(reg, table->yes_ranges,
table->n_yes_ranges);
}
EXPORT_SYMBOL_GPL(regmap_check_range_table);
bool regmap_writeable(struct regmap *map, unsigned int reg)
{
if (map->max_register_is_set && reg > map->max_register)
return false ;
if (map->writeable_reg)
return map->writeable_reg(map->dev, reg);
if (map->wr_table)
return regmap_check_range_table(map, reg, map->wr_table);
return true ;
}
bool regmap_cached(struct regmap *map, unsigned int reg)
{
int ret;
unsigned int val;
if (map->cache_type == REGCACHE_NONE)
return false ;
if (!map->cache_ops)
return false ;
if (map->max_register_is_set && reg > map->max_register)
return false ;
map->lock(map->lock_arg);
ret = regcache_read(map, reg, &val);
map->unlock(map->lock_arg);
if (ret)
return false ;
return true ;
}
bool regmap_readable(struct regmap *map, unsigned int reg)
{
if (!map->reg_read)
return false ;
if (map->max_register_is_set && reg > map->max_register)
return false ;
if (map->format.format_write)
return false ;
if (map->readable_reg)
return map->readable_reg(map->dev, reg);
if (map->rd_table)
return regmap_check_range_table(map, reg, map->rd_table);
return true ;
}
bool regmap_volatile(struct regmap *map, unsigned int reg)
{
if (!map->format.format_write && !regmap_readable(map, reg))
return false ;
if (map->volatile_reg)
return map->volatile_reg(map->dev, reg);
if (map->volatile_table)
return regmap_check_range_table(map, reg, map->volatile_table);
if (map->cache_ops)
return false ;
else
return true ;
}
bool regmap_precious(struct regmap *map, unsigned int reg)
{
if (!regmap_readable(map, reg))
return false ;
if (map->precious_reg)
return map->precious_reg(map->dev, reg);
if (map->precious_table)
return regmap_check_range_table(map, reg, map->precious_table);
return false ;
}
bool regmap_writeable_noinc(struct regmap *map, unsigned int reg)
{
if (map->writeable_noinc_reg)
return map->writeable_noinc_reg(map->dev, reg);
if (map->wr_noinc_table)
return regmap_check_range_table(map, reg, map->wr_noinc_table);
return true ;
}
bool regmap_readable_noinc(struct regmap *map, unsigned int reg)
{
if (map->readable_noinc_reg)
return map->readable_noinc_reg(map->dev, reg);
if (map->rd_noinc_table)
return regmap_check_range_table(map, reg, map->rd_noinc_table);
return true ;
}
static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
size_t num)
{
unsigned int i;
for (i = 0 ; i < num; i++)
if (!regmap_volatile(map, reg + regmap_get_offset(map, i)))
return false ;
return true ;
}
static void regmap_format_12_20_write(struct regmap *map,
unsigned int reg, unsigned int val)
{
u8 *out = map->work_buf;
out[0 ] = reg >> 4 ;
out[1 ] = (reg << 4 ) | (val >> 16 );
out[2 ] = val >> 8 ;
out[3 ] = val;
}
static void regmap_format_2_6_write(struct regmap *map,
unsigned int reg, unsigned int val)
{
u8 *out = map->work_buf;
*out = (reg << 6 ) | val;
}
static void regmap_format_4_12_write(struct regmap *map,
unsigned int reg, unsigned int val)
{
__be16 *out = map->work_buf;
*out = cpu_to_be16((reg << 12 ) | val);
}
static void regmap_format_7_9_write(struct regmap *map,
unsigned int reg, unsigned int val)
{
__be16 *out = map->work_buf;
*out = cpu_to_be16((reg << 9 ) | val);
}
static void regmap_format_7_17_write(struct regmap *map,
unsigned int reg, unsigned int val)
{
u8 *out = map->work_buf;
out[2 ] = val;
out[1 ] = val >> 8 ;
out[0 ] = (val >> 16 ) | (reg << 1 );
}
static void regmap_format_10_14_write(struct regmap *map,
unsigned int reg, unsigned int val)
{
u8 *out = map->work_buf;
out[2 ] = val;
out[1 ] = (val >> 8 ) | (reg << 6 );
out[0 ] = reg >> 2 ;
}
static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
{
u8 *b = buf;
b[0 ] = val << shift;
}
static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift)
{
put_unaligned_be16(val << shift, buf);
}
static void regmap_format_16_le(void *buf, unsigned int val, unsigned int shift)
{
put_unaligned_le16(val << shift, buf);
}
static void regmap_format_16_native(void *buf, unsigned int val,
unsigned int shift)
{
u16 v = val << shift;
memcpy(buf, &v, sizeof (v));
}
static void regmap_format_24_be(void *buf, unsigned int val, unsigned int shift)
{
put_unaligned_be24(val << shift, buf);
}
static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
{
put_unaligned_be32(val << shift, buf);
}
static void regmap_format_32_le(void *buf, unsigned int val, unsigned int shift)
{
put_unaligned_le32(val << shift, buf);
}
static void regmap_format_32_native(void *buf, unsigned int val,
unsigned int shift)
{
u32 v = val << shift;
memcpy(buf, &v, sizeof (v));
}
static void regmap_parse_inplace_noop(void *buf)
{
}
static unsigned int regmap_parse_8(const void *buf)
{
const u8 *b = buf;
return b[0 ];
}
static unsigned int regmap_parse_16_be(const void *buf)
{
return get_unaligned_be16(buf);
}
static unsigned int regmap_parse_16_le(const void *buf)
{
return get_unaligned_le16(buf);
}
static void regmap_parse_16_be_inplace(void *buf)
{
u16 v = get_unaligned_be16(buf);
memcpy(buf, &v, sizeof (v));
}
static void regmap_parse_16_le_inplace(void *buf)
{
u16 v = get_unaligned_le16(buf);
memcpy(buf, &v, sizeof (v));
}
static unsigned int regmap_parse_16_native(const void *buf)
{
u16 v;
memcpy(&v, buf, sizeof (v));
return v;
}
static unsigned int regmap_parse_24_be(const void *buf)
{
return get_unaligned_be24(buf);
}
static unsigned int regmap_parse_32_be(const void *buf)
{
return get_unaligned_be32(buf);
}
static unsigned int regmap_parse_32_le(const void *buf)
{
return get_unaligned_le32(buf);
}
static void regmap_parse_32_be_inplace(void *buf)
{
u32 v = get_unaligned_be32(buf);
memcpy(buf, &v, sizeof (v));
}
static void regmap_parse_32_le_inplace(void *buf)
{
u32 v = get_unaligned_le32(buf);
memcpy(buf, &v, sizeof (v));
}
static unsigned int regmap_parse_32_native(const void *buf)
{
u32 v;
memcpy(&v, buf, sizeof (v));
return v;
}
static void regmap_lock_hwlock(void *__map)
{
struct regmap *map = __map;
hwspin_lock_timeout(map->hwlock, UINT_MAX);
}
static void regmap_lock_hwlock_irq(void *__map)
{
struct regmap *map = __map;
hwspin_lock_timeout_irq(map->hwlock, UINT_MAX);
}
static void regmap_lock_hwlock_irqsave(void *__map)
{
struct regmap *map = __map;
hwspin_lock_timeout_irqsave(map->hwlock, UINT_MAX,
&map->spinlock_flags);
}
static void regmap_unlock_hwlock(void *__map)
{
struct regmap *map = __map;
hwspin_unlock(map->hwlock);
}
static void regmap_unlock_hwlock_irq(void *__map)
{
struct regmap *map = __map;
hwspin_unlock_irq(map->hwlock);
}
static void regmap_unlock_hwlock_irqrestore(void *__map)
{
struct regmap *map = __map;
hwspin_unlock_irqrestore(map->hwlock, &map->spinlock_flags);
}
static void regmap_lock_unlock_none(void *__map)
{
}
static void regmap_lock_mutex(void *__map)
{
struct regmap *map = __map;
mutex_lock(&map->mutex);
}
static void regmap_unlock_mutex(void *__map)
{
struct regmap *map = __map;
mutex_unlock(&map->mutex);
}
static void regmap_lock_spinlock(void *__map)
__acquires(&map->spinlock)
{
struct regmap *map = __map;
unsigned long flags;
spin_lock_irqsave(&map->spinlock, flags);
map->spinlock_flags = flags;
}
static void regmap_unlock_spinlock(void *__map)
__releases(&map->spinlock)
{
struct regmap *map = __map;
spin_unlock_irqrestore(&map->spinlock, map->spinlock_flags);
}
static void regmap_lock_raw_spinlock(void *__map)
__acquires(&map->raw_spinlock)
{
struct regmap *map = __map;
unsigned long flags;
raw_spin_lock_irqsave(&map->raw_spinlock, flags);
map->raw_spinlock_flags = flags;
}
static void regmap_unlock_raw_spinlock(void *__map)
__releases(&map->raw_spinlock)
{
struct regmap *map = __map;
raw_spin_unlock_irqrestore(&map->raw_spinlock, map->raw_spinlock_flags);
}
static void dev_get_regmap_release(struct device *dev, void *res)
{
/*
* We don ' t actually have anything to do here ; the goal here
* is not to manage the regmap but to provide a simple way to
* get the regmap back given a struct device .
*/
}
static bool _regmap_range_add(struct regmap *map,
struct regmap_range_node *data)
{
struct rb_root *root = &map->range_tree;
struct rb_node **new = &(root->rb_node), *parent = NULL;
while (*new ) {
struct regmap_range_node *this =
rb_entry(*new , struct regmap_range_node, node);
parent = *new ;
if (data->range_max < this ->range_min)
new = &((*new )->rb_left);
else if (data->range_min > this ->range_max)
new = &((*new )->rb_right);
else
return false ;
}
rb_link_node(&data->node, parent, new );
rb_insert_color(&data->node, root);
return true ;
}
static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
unsigned int reg)
{
struct rb_node *node = map->range_tree.rb_node;
while (node) {
struct regmap_range_node *this =
rb_entry(node, struct regmap_range_node, node);
if (reg < this ->range_min)
node = node->rb_left;
else if (reg > this ->range_max)
node = node->rb_right;
else
return this ;
}
return NULL;
}
static void regmap_range_exit(struct regmap *map)
{
struct rb_node *next;
struct regmap_range_node *range_node;
next = rb_first(&map->range_tree);
while (next) {
range_node = rb_entry(next, struct regmap_range_node, node);
next = rb_next(&range_node->node);
rb_erase(&range_node->node, &map->range_tree);
kfree(range_node);
}
kfree(map->selector_work_buf);
}
static int regmap_set_name(struct regmap *map, const struct regmap_config *config)
{
if (config->name) {
const char *name = kstrdup_const(config->name, GFP_KERNEL);
if (!name)
return -ENOMEM;
kfree_const(map->name);
map->name = name;
}
return 0 ;
}
int regmap_attach_dev(struct device *dev, struct regmap *map,
const struct regmap_config *config)
{
struct regmap **m;
int ret;
map->dev = dev;
ret = regmap_set_name(map, config);
if (ret)
return ret;
regmap_debugfs_exit(map);
regmap_debugfs_init(map);
/* Add a devres resource for dev_get_regmap() */
m = devres_alloc(dev_get_regmap_release, sizeof (*m), GFP_KERNEL);
if (!m) {
regmap_debugfs_exit(map);
return -ENOMEM;
}
*m = map;
devres_add(dev, m);
return 0 ;
}
EXPORT_SYMBOL_GPL(regmap_attach_dev);
static int dev_get_regmap_match(struct device *dev, void *res, void *data);
static int regmap_detach_dev(struct device *dev, struct regmap *map)
{
if (!dev)
return 0 ;
return devres_release(dev, dev_get_regmap_release,
dev_get_regmap_match, (void *)map->name);
}
static enum regmap_endian regmap_get_reg_endian(const struct regmap_bus *bus,
const struct regmap_config *config)
{
enum regmap_endian endian;
/* Retrieve the endianness specification from the regmap config */
endian = config->reg_format_endian;
/* If the regmap config specified a non-default value, use that */
if (endian != REGMAP_ENDIAN_DEFAULT)
return endian;
/* Retrieve the endianness specification from the bus config */
if (bus && bus->reg_format_endian_default)
endian = bus->reg_format_endian_default;
/* If the bus specified a non-default value, use that */
if (endian != REGMAP_ENDIAN_DEFAULT)
return endian;
/* Use this if no other value was found */
return REGMAP_ENDIAN_BIG;
}
enum regmap_endian regmap_get_val_endian(struct device *dev,
const struct regmap_bus *bus,
const struct regmap_config *config)
{
struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL;
enum regmap_endian endian;
/* Retrieve the endianness specification from the regmap config */
endian = config->val_format_endian;
/* If the regmap config specified a non-default value, use that */
if (endian != REGMAP_ENDIAN_DEFAULT)
return endian;
/* If the firmware node exist try to get endianness from it */
if (fwnode_property_read_bool(fwnode, "big-endian" ))
endian = REGMAP_ENDIAN_BIG;
else if (fwnode_property_read_bool(fwnode, "little-endian" ))
endian = REGMAP_ENDIAN_LITTLE;
else if (fwnode_property_read_bool(fwnode, "native-endian" ))
endian = REGMAP_ENDIAN_NATIVE;
/* If the endianness was specified in fwnode, use that */
if (endian != REGMAP_ENDIAN_DEFAULT)
return endian;
/* Retrieve the endianness specification from the bus config */
if (bus && bus->val_format_endian_default)
endian = bus->val_format_endian_default;
/* If the bus specified a non-default value, use that */
if (endian != REGMAP_ENDIAN_DEFAULT)
return endian;
/* Use this if no other value was found */
return REGMAP_ENDIAN_BIG;
}
EXPORT_SYMBOL_GPL(regmap_get_val_endian);
struct regmap *__regmap_init(struct device *dev,
const struct regmap_bus *bus,
void *bus_context,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name)
{
struct regmap *map;
int ret = -EINVAL;
enum regmap_endian reg_endian, val_endian;
int i, j;
if (!config)
goto err;
map = kzalloc(sizeof (*map), GFP_KERNEL);
if (map == NULL) {
ret = -ENOMEM;
goto err;
}
ret = regmap_set_name(map, config);
if (ret)
goto err_map;
ret = -EINVAL; /* Later error paths rely on this */
if (config->disable_locking) {
map->lock = map->unlock = regmap_lock_unlock_none;
map->can_sleep = config->can_sleep;
regmap_debugfs_disable(map);
} else if (config->lock && config->unlock) {
map->lock = config->lock;
map->unlock = config->unlock;
map->lock_arg = config->lock_arg;
map->can_sleep = config->can_sleep;
} else if (config->use_hwlock) {
map->hwlock = hwspin_lock_request_specific(config->hwlock_id);
if (!map->hwlock) {
ret = -ENXIO;
goto err_name;
}
switch (config->hwlock_mode) {
case HWLOCK_IRQSTATE:
map->lock = regmap_lock_hwlock_irqsave;
map->unlock = regmap_unlock_hwlock_irqrestore;
break ;
case HWLOCK_IRQ:
map->lock = regmap_lock_hwlock_irq;
map->unlock = regmap_unlock_hwlock_irq;
break ;
default :
map->lock = regmap_lock_hwlock;
map->unlock = regmap_unlock_hwlock;
break ;
}
map->lock_arg = map;
} else {
if ((bus && bus->fast_io) ||
config->fast_io) {
if (config->use_raw_spinlock) {
raw_spin_lock_init(&map->raw_spinlock);
map->lock = regmap_lock_raw_spinlock;
map->unlock = regmap_unlock_raw_spinlock;
lockdep_set_class_and_name(&map->raw_spinlock,
lock_key, lock_name);
} else {
spin_lock_init(&map->spinlock);
map->lock = regmap_lock_spinlock;
map->unlock = regmap_unlock_spinlock;
lockdep_set_class_and_name(&map->spinlock,
lock_key, lock_name);
}
} else {
mutex_init(&map->mutex);
map->lock = regmap_lock_mutex;
map->unlock = regmap_unlock_mutex;
map->can_sleep = true ;
lockdep_set_class_and_name(&map->mutex,
lock_key, lock_name);
}
map->lock_arg = map;
map->lock_key = lock_key;
}
/*
* When we write in fast - paths with regmap_bulk_write ( ) don ' t allocate
* scratch buffers with sleeping allocations .
*/
if ((bus && bus->fast_io) || config->fast_io)
map->alloc_flags = GFP_ATOMIC;
else
map->alloc_flags = GFP_KERNEL;
map->reg_base = config->reg_base;
map->reg_shift = config->pad_bits % 8 ;
map->format.pad_bytes = config->pad_bits / 8 ;
map->format.reg_shift = config->reg_shift;
map->format.reg_bytes = BITS_TO_BYTES(config->reg_bits);
map->format.val_bytes = BITS_TO_BYTES(config->val_bits);
map->format.buf_size = BITS_TO_BYTES(config->reg_bits + config->val_bits + config->pad_bits);
if (config->reg_stride)
map->reg_stride = config->reg_stride;
else
map->reg_stride = 1 ;
if (is_power_of_2(map->reg_stride))
map->reg_stride_order = ilog2(map->reg_stride);
else
map->reg_stride_order = -1 ;
map->use_single_read = config->use_single_read || !(config->read || (bus && bus->read));
map->use_single_write = config->use_single_write || !(config->write || (bus && bus->write));
map->can_multi_write = config->can_multi_write && (config->write || (bus && bus->write));
if (bus) {
map->max_raw_read = bus->max_raw_read;
map->max_raw_write = bus->max_raw_write;
} else if (config->max_raw_read && config->max_raw_write) {
map->max_raw_read = config->max_raw_read;
map->max_raw_write = config->max_raw_write;
}
map->dev = dev;
map->bus = bus;
map->bus_context = bus_context;
map->max_register = config->max_register;
map->max_register_is_set = map->max_register ?: config->max_register_is_0;
map->wr_table = config->wr_table;
map->rd_table = config->rd_table;
map->volatile_table = config->volatile_table;
map->precious_table = config->precious_table;
map->wr_noinc_table = config->wr_noinc_table;
map->rd_noinc_table = config->rd_noinc_table;
map->writeable_reg = config->writeable_reg;
map->readable_reg = config->readable_reg;
map->volatile_reg = config->volatile_reg;
map->precious_reg = config->precious_reg;
map->writeable_noinc_reg = config->writeable_noinc_reg;
map->readable_noinc_reg = config->readable_noinc_reg;
map->cache_type = config->cache_type;
spin_lock_init(&map->async_lock);
INIT_LIST_HEAD(&map->async_list);
INIT_LIST_HEAD(&map->async_free);
init_waitqueue_head(&map->async_waitq);
if (config->read_flag_mask ||
config->write_flag_mask ||
config->zero_flag_mask) {
map->read_flag_mask = config->read_flag_mask;
map->write_flag_mask = config->write_flag_mask;
} else if (bus) {
map->read_flag_mask = bus->read_flag_mask;
}
if (config->read && config->write) {
map->reg_read = _regmap_bus_read;
if (config->reg_update_bits)
map->reg_update_bits = config->reg_update_bits;
/* Bulk read/write */
map->read = config->read;
map->write = config->write;
reg_endian = REGMAP_ENDIAN_NATIVE;
val_endian = REGMAP_ENDIAN_NATIVE;
} else if (!bus) {
map->reg_read = config->reg_read;
map->reg_write = config->reg_write;
map->reg_update_bits = config->reg_update_bits;
map->defer_caching = false ;
goto skip_format_initialization;
} else if (!bus->read || !bus->write) {
map->reg_read = _regmap_bus_reg_read;
map->reg_write = _regmap_bus_reg_write;
map->reg_update_bits = bus->reg_update_bits;
map->defer_caching = false ;
goto skip_format_initialization;
} else {
map->reg_read = _regmap_bus_read;
map->reg_update_bits = bus->reg_update_bits;
/* Bulk read/write */
map->read = bus->read;
map->write = bus->write;
reg_endian = regmap_get_reg_endian(bus, config);
val_endian = regmap_get_val_endian(dev, bus, config);
}
switch (config->reg_bits + map->reg_shift) {
case 2 :
switch (config->val_bits) {
case 6 :
map->format.format_write = regmap_format_2_6_write;
break ;
default :
goto err_hwlock;
}
break ;
case 4 :
switch (config->val_bits) {
case 12 :
map->format.format_write = regmap_format_4_12_write;
break ;
default :
goto err_hwlock;
}
break ;
case 7 :
switch (config->val_bits) {
case 9 :
map->format.format_write = regmap_format_7_9_write;
break ;
case 17 :
map->format.format_write = regmap_format_7_17_write;
break ;
default :
goto err_hwlock;
}
break ;
case 10 :
switch (config->val_bits) {
case 14 :
map->format.format_write = regmap_format_10_14_write;
break ;
default :
goto err_hwlock;
}
break ;
case 12 :
switch (config->val_bits) {
case 20 :
map->format.format_write = regmap_format_12_20_write;
break ;
default :
goto err_hwlock;
}
break ;
case 8 :
map->format.format_reg = regmap_format_8;
break ;
case 16 :
switch (reg_endian) {
case REGMAP_ENDIAN_BIG:
map->format.format_reg = regmap_format_16_be;
break ;
case REGMAP_ENDIAN_LITTLE:
map->format.format_reg = regmap_format_16_le;
break ;
case REGMAP_ENDIAN_NATIVE:
map->format.format_reg = regmap_format_16_native;
break ;
default :
goto err_hwlock;
}
break ;
case 24 :
switch (reg_endian) {
case REGMAP_ENDIAN_BIG:
map->format.format_reg = regmap_format_24_be;
break ;
default :
goto err_hwlock;
}
break ;
case 32 :
switch (reg_endian) {
case REGMAP_ENDIAN_BIG:
map->format.format_reg = regmap_format_32_be;
break ;
case REGMAP_ENDIAN_LITTLE:
map->format.format_reg = regmap_format_32_le;
break ;
case REGMAP_ENDIAN_NATIVE:
map->format.format_reg = regmap_format_32_native;
break ;
default :
goto err_hwlock;
}
break ;
default :
goto err_hwlock;
}
if (val_endian == REGMAP_ENDIAN_NATIVE)
map->format.parse_inplace = regmap_parse_inplace_noop;
switch (config->val_bits) {
case 8 :
map->format.format_val = regmap_format_8;
map->format.parse_val = regmap_parse_8;
map->format.parse_inplace = regmap_parse_inplace_noop;
break ;
case 16 :
switch (val_endian) {
case REGMAP_ENDIAN_BIG:
map->format.format_val = regmap_format_16_be;
map->format.parse_val = regmap_parse_16_be;
map->format.parse_inplace = regmap_parse_16_be_inplace;
break ;
case REGMAP_ENDIAN_LITTLE:
map->format.format_val = regmap_format_16_le;
map->format.parse_val = regmap_parse_16_le;
map->format.parse_inplace = regmap_parse_16_le_inplace;
break ;
case REGMAP_ENDIAN_NATIVE:
map->format.format_val = regmap_format_16_native;
map->format.parse_val = regmap_parse_16_native;
break ;
default :
goto err_hwlock;
}
break ;
case 24 :
switch (val_endian) {
case REGMAP_ENDIAN_BIG:
map->format.format_val = regmap_format_24_be;
map->format.parse_val = regmap_parse_24_be;
break ;
default :
goto err_hwlock;
}
break ;
case 32 :
switch (val_endian) {
case REGMAP_ENDIAN_BIG:
map->format.format_val = regmap_format_32_be;
map->format.parse_val = regmap_parse_32_be;
map->format.parse_inplace = regmap_parse_32_be_inplace;
break ;
case REGMAP_ENDIAN_LITTLE:
map->format.format_val = regmap_format_32_le;
map->format.parse_val = regmap_parse_32_le;
map->format.parse_inplace = regmap_parse_32_le_inplace;
break ;
case REGMAP_ENDIAN_NATIVE:
map->format.format_val = regmap_format_32_native;
map->format.parse_val = regmap_parse_32_native;
break ;
default :
goto err_hwlock;
}
break ;
}
if (map->format.format_write) {
if ((reg_endian != REGMAP_ENDIAN_BIG) ||
(val_endian != REGMAP_ENDIAN_BIG))
goto err_hwlock;
map->use_single_write = true ;
}
if (!map->format.format_write &&
!(map->format.format_reg && map->format.format_val))
goto err_hwlock;
map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
if (map->work_buf == NULL) {
ret = -ENOMEM;
goto err_hwlock;
}
if (map->format.format_write) {
map->defer_caching = false ;
map->reg_write = _regmap_bus_formatted_write;
} else if (map->format.format_val) {
map->defer_caching = true ;
map->reg_write = _regmap_bus_raw_write;
}
skip_format_initialization:
map->range_tree = RB_ROOT;
for (i = 0 ; i < config->num_ranges; i++) {
const struct regmap_range_cfg *range_cfg = &config->ranges[i];
struct regmap_range_node *new ;
/* Sanity check */
if (range_cfg->range_max < range_cfg->range_min) {
dev_err(map->dev, "Invalid range %d: %u < %u\n" , i,
range_cfg->range_max, range_cfg->range_min);
goto err_range;
}
if (range_cfg->range_max > map->max_register) {
dev_err(map->dev, "Invalid range %d: %u > %u\n" , i,
range_cfg->range_max, map->max_register);
goto err_range;
}
if (range_cfg->selector_reg > map->max_register) {
dev_err(map->dev,
"Invalid range %d: selector out of map\n" , i);
goto err_range;
}
if (range_cfg->window_len == 0 ) {
dev_err(map->dev, "Invalid range %d: window_len 0\n" ,
i);
goto err_range;
}
/* Make sure, that this register range has no selector
or data window within its boundary */
for (j = 0 ; j < config->num_ranges; j++) {
unsigned int sel_reg = config->ranges[j].selector_reg;
unsigned int win_min = config->ranges[j].window_start;
unsigned int win_max = win_min +
config->ranges[j].window_len - 1 ;
/* Allow data window inside its own virtual range */
if (j == i)
continue ;
if (range_cfg->range_min <= sel_reg &&
sel_reg <= range_cfg->range_max) {
dev_err(map->dev,
"Range %d: selector for %d in window\n" ,
i, j);
goto err_range;
}
if (!(win_max < range_cfg->range_min ||
win_min > range_cfg->range_max)) {
dev_err(map->dev,
"Range %d: window for %d in window\n" ,
i, j);
goto err_range;
}
}
new = kzalloc(sizeof (*new ), GFP_KERNEL);
if (new == NULL) {
ret = -ENOMEM;
goto err_range;
}
new ->map = map;
new ->name = range_cfg->name;
new ->range_min = range_cfg->range_min;
new ->range_max = range_cfg->range_max;
new ->selector_reg = range_cfg->selector_reg;
new ->selector_mask = range_cfg->selector_mask;
new ->selector_shift = range_cfg->selector_shift;
new ->window_start = range_cfg->window_start;
new ->window_len = range_cfg->window_len;
if (!_regmap_range_add(map, new )) {
dev_err(map->dev, "Failed to add range %d\n" , i);
kfree(new );
goto err_range;
}
if (map->selector_work_buf == NULL) {
map->selector_work_buf =
kzalloc(map->format.buf_size, GFP_KERNEL);
if (map->selector_work_buf == NULL) {
ret = -ENOMEM;
goto err_range;
}
}
}
ret = regcache_init(map, config);
if (ret != 0 )
goto err_range;
if (dev) {
ret = regmap_attach_dev(dev, map, config);
if (ret != 0 )
goto err_regcache;
} else {
regmap_debugfs_init(map);
}
return map;
err_regcache:
regcache_exit(map);
err_range:
regmap_range_exit(map);
kfree(map->work_buf);
err_hwlock:
if (map->hwlock)
hwspin_lock_free(map->hwlock);
err_name:
kfree_const(map->name);
err_map:
kfree(map);
err:
if (bus && bus->free_on_exit)
kfree(bus);
return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(__regmap_init);
static void devm_regmap_release(struct device *dev, void *res)
{
regmap_exit(*(struct regmap **)res);
}
struct regmap *__devm_regmap_init(struct device *dev,
const struct regmap_bus *bus,
void *bus_context,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name)
{
struct regmap **ptr, *regmap;
ptr = devres_alloc(devm_regmap_release, sizeof (*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
regmap = __regmap_init(dev, bus, bus_context, config,
lock_key, lock_name);
if (!IS_ERR(regmap)) {
*ptr = regmap;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return regmap;
}
EXPORT_SYMBOL_GPL(__devm_regmap_init);
static void regmap_field_init(struct regmap_field *rm_field,
struct regmap *regmap, struct reg_field reg_field)
{
rm_field->regmap = regmap;
rm_field->reg = reg_field.reg;
rm_field->shift = reg_field.lsb;
rm_field->mask = GENMASK(reg_field.msb, reg_field.lsb);
WARN_ONCE(rm_field->mask == 0 , "invalid empty mask defined\n" );
rm_field->id_size = reg_field.id_size;
rm_field->id_offset = reg_field.id_offset;
}
/**
* devm_regmap_field_alloc ( ) - Allocate and initialise a register field .
*
* @ dev : Device that will be interacted with
* @ regmap : regmap bank in which this register field is located .
* @ reg_field : Register field with in the bank .
*
* The return value will be an ERR_PTR ( ) on error or a valid pointer
* to a struct regmap_field . The regmap_field will be automatically freed
* by the device management code .
*/
struct regmap_field *devm_regmap_field_alloc(struct device *dev,
struct regmap *regmap, struct reg_field reg_field)
{
struct regmap_field *rm_field = devm_kzalloc(dev,
sizeof (*rm_field), GFP_KERNEL);
if (!rm_field)
return ERR_PTR(-ENOMEM);
regmap_field_init(rm_field, regmap, reg_field);
return rm_field;
}
EXPORT_SYMBOL_GPL(devm_regmap_field_alloc);
/**
* regmap_field_bulk_alloc ( ) - Allocate and initialise a bulk register field .
*
* @ regmap : regmap bank in which this register field is located .
* @ rm_field : regmap register fields within the bank .
* @ reg_field : Register fields within the bank .
* @ num_fields : Number of register fields .
*
* The return value will be an - ENOMEM on error or zero for success .
* Newly allocated regmap_fields should be freed by calling
* regmap_field_bulk_free ( )
*/
int regmap_field_bulk_alloc(struct regmap *regmap,
struct regmap_field **rm_field,
const struct reg_field *reg_field,
int num_fields)
{
struct regmap_field *rf;
int i;
rf = kcalloc(num_fields, sizeof (*rf), GFP_KERNEL);
if (!rf)
return -ENOMEM;
for (i = 0 ; i < num_fields; i++) {
regmap_field_init(&rf[i], regmap, reg_field[i]);
rm_field[i] = &rf[i];
}
return 0 ;
}
EXPORT_SYMBOL_GPL(regmap_field_bulk_alloc);
/**
* devm_regmap_field_bulk_alloc ( ) - Allocate and initialise a bulk register
* fields .
*
* @ dev : Device that will be interacted with
* @ regmap : regmap bank in which this register field is located .
* @ rm_field : regmap register fields within the bank .
* @ reg_field : Register fields within the bank .
* @ num_fields : Number of register fields .
*
* The return value will be an - ENOMEM on error or zero for success .
* Newly allocated regmap_fields will be automatically freed by the
* device management code .
*/
int devm_regmap_field_bulk_alloc(struct device *dev,
struct regmap *regmap,
struct regmap_field **rm_field,
const struct reg_field *reg_field,
int num_fields)
{
struct regmap_field *rf;
int i;
rf = devm_kcalloc(dev, num_fields, sizeof (*rf), GFP_KERNEL);
if (!rf)
return -ENOMEM;
for (i = 0 ; i < num_fields; i++) {
regmap_field_init(&rf[i], regmap, reg_field[i]);
rm_field[i] = &rf[i];
}
return 0 ;
}
EXPORT_SYMBOL_GPL(devm_regmap_field_bulk_alloc);
/**
* regmap_field_bulk_free ( ) - Free register field allocated using
* regmap_field_bulk_alloc .
*
* @ field : regmap fields which should be freed .
*/
void regmap_field_bulk_free(struct regmap_field *field)
{
kfree(field);
}
EXPORT_SYMBOL_GPL(regmap_field_bulk_free);
/**
* devm_regmap_field_bulk_free ( ) - Free a bulk register field allocated using
* devm_regmap_field_bulk_alloc .
*
* @ dev : Device that will be interacted with
* @ field : regmap field which should be freed .
*
* Free register field allocated using devm_regmap_field_bulk_alloc ( ) . Usually
* drivers need not call this function , as the memory allocated via devm
* will be freed as per device - driver life - cycle .
*/
void devm_regmap_field_bulk_free(struct device *dev,
struct regmap_field *field)
{
devm_kfree(dev, field);
}
EXPORT_SYMBOL_GPL(devm_regmap_field_bulk_free);
/**
* devm_regmap_field_free ( ) - Free a register field allocated using
* devm_regmap_field_alloc .
*
* @ dev : Device that will be interacted with
* @ field : regmap field which should be freed .
*
* Free register field allocated using devm_regmap_field_alloc ( ) . Usually
* drivers need not call this function , as the memory allocated via devm
* will be freed as per device - driver life - cyle .
*/
void devm_regmap_field_free(struct device *dev,
struct regmap_field *field)
{
devm_kfree(dev, field);
}
EXPORT_SYMBOL_GPL(devm_regmap_field_free);
/**
* regmap_field_alloc ( ) - Allocate and initialise a register field .
*
* @ regmap : regmap bank in which this register field is located .
* @ reg_field : Register field with in the bank .
*
* The return value will be an ERR_PTR ( ) on error or a valid pointer
* to a struct regmap_field . The regmap_field should be freed by the
* user once its finished working with it using regmap_field_free ( ) .
*/
struct regmap_field *regmap_field_alloc(struct regmap *regmap,
struct reg_field reg_field)
{
struct regmap_field *rm_field = kzalloc(sizeof (*rm_field), GFP_KERNEL);
if (!rm_field)
return ERR_PTR(-ENOMEM);
regmap_field_init(rm_field, regmap, reg_field);
return rm_field;
}
EXPORT_SYMBOL_GPL(regmap_field_alloc);
/**
* regmap_field_free ( ) - Free register field allocated using
* regmap_field_alloc .
*
* @ field : regmap field which should be freed .
*/
void regmap_field_free(struct regmap_field *field)
{
kfree(field);
}
EXPORT_SYMBOL_GPL(regmap_field_free);
/**
* regmap_reinit_cache ( ) - Reinitialise the current register cache
*
* @ map : Register map to operate on .
* @ config : New configuration . Only the cache data will be used .
*
* Discard any existing register cache for the map and initialize a
* new cache . This can be used to restore the cache to defaults or to
* update the cache configuration to reflect runtime discovery of the
* hardware .
*
* No explicit locking is done here , the user needs to ensure that
* this function will not race with other calls to regmap .
*/
int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
{
int ret;
regcache_exit(map);
regmap_debugfs_exit(map);
map->max_register = config->max_register;
map->max_register_is_set = map->max_register ?: config->max_register_is_0;
map->writeable_reg = config->writeable_reg;
map->readable_reg = config->readable_reg;
map->volatile_reg = config->volatile_reg;
map->precious_reg = config->precious_reg;
map->writeable_noinc_reg = config->writeable_noinc_reg;
map->readable_noinc_reg = config->readable_noinc_reg;
map->cache_type = config->cache_type;
ret = regmap_set_name(map, config);
if (ret)
return ret;
regmap_debugfs_init(map);
map->cache_bypass = false ;
map->cache_only = false ;
return regcache_init(map, config);
}
EXPORT_SYMBOL_GPL(regmap_reinit_cache);
/**
* regmap_exit ( ) - Free a previously allocated register map
*
* @ map : Register map to operate on .
*/
void regmap_exit(struct regmap *map)
{
struct regmap_async *async;
regmap_detach_dev(map->dev, map);
regcache_exit(map);
regmap_debugfs_exit(map);
regmap_range_exit(map);
if (map->bus && map->bus->free_context)
map->bus->free_context(map->bus_context);
kfree(map->work_buf);
while (!list_empty(&map->async_free)) {
async = list_first_entry_or_null(&map->async_free,
struct regmap_async,
list);
list_del(&async->list);
kfree(async->work_buf);
kfree(async);
}
if (map->hwlock)
hwspin_lock_free(map->hwlock);
if (map->lock == regmap_lock_mutex)
mutex_destroy(&map->mutex);
kfree_const(map->name);
kfree(map->patch);
if (map->bus && map->bus->free_on_exit)
kfree(map->bus);
kfree(map);
}
EXPORT_SYMBOL_GPL(regmap_exit);
static int dev_get_regmap_match(struct device *dev, void *res, void *data)
{
struct regmap **r = res;
if (!r || !*r) {
WARN_ON(!r || !*r);
return 0 ;
}
/* If the user didn't specify a name match any */
if (data)
return (*r)->name && !strcmp((*r)->name, data);
else
return 1 ;
}
/**
* dev_get_regmap ( ) - Obtain the regmap ( if any ) for a device
*
* @ dev : Device to retrieve the map for
* @ name : Optional name for the register map , usually NULL .
*
* Returns the regmap for the device if one is present , or NULL . If
* name is specified then it must match the name specified when
* registering the device , if it is NULL then the first regmap found
* will be used . Devices with multiple register maps are very rare ,
* generic code should normally not need to specify a name .
*/
struct regmap *dev_get_regmap(struct device *dev, const char *name)
{
struct regmap **r = devres_find(dev, dev_get_regmap_release,
dev_get_regmap_match, (void *)name);
if (!r)
return NULL;
return *r;
}
EXPORT_SYMBOL_GPL(dev_get_regmap);
/**
* regmap_get_device ( ) - Obtain the device from a regmap
*
* @ map : Register map to operate on .
*
* Returns the underlying device that the regmap has been created for .
*/
struct device *regmap_get_device(struct regmap *map)
{
return map->dev;
}
EXPORT_SYMBOL_GPL(regmap_get_device);
static int _regmap_select_page(struct regmap *map, unsigned int *reg,
struct regmap_range_node *range,
unsigned int val_num)
{
void *orig_work_buf;
unsigned int win_offset;
unsigned int win_page;
bool page_chg;
int ret;
win_offset = (*reg - range->range_min) % range->window_len;
win_page = (*reg - range->range_min) / range->window_len;
if (val_num > 1 ) {
/* Bulk write shouldn't cross range boundary */
if (*reg + val_num - 1 > range->range_max)
return -EINVAL;
/* ... or single page boundary */
if (val_num > range->window_len - win_offset)
return -EINVAL;
}
/* It is possible to have selector register inside data window.
In that case , selector register is located on every page and
it needs no page switching, when accessed alone. */
if (val_num > 1 ||
range->window_start + win_offset != range->selector_reg) {
/* Use separate work_buf during page switching */
orig_work_buf = map->work_buf;
map->work_buf = map->selector_work_buf;
ret = _regmap_update_bits(map, range->selector_reg,
range->selector_mask,
win_page << range->selector_shift,
&page_chg, false );
map->work_buf = orig_work_buf;
if (ret != 0 )
return ret;
}
*reg = range->window_start + win_offset;
return 0 ;
}
static void regmap_set_work_buf_flag_mask(struct regmap *map, int max_bytes,
unsigned long mask)
{
u8 *buf;
int i;
if (!mask || !map->work_buf)
return ;
buf = map->work_buf;
for (i = 0 ; i < max_bytes; i++)
buf[i] |= (mask >> (8 * i)) & 0 xff;
}
static unsigned int regmap_reg_addr(struct regmap *map, unsigned int reg)
{
reg += map->reg_base;
if (map->format.reg_shift > 0 )
reg >>= map->format.reg_shift;
else if (map->format.reg_shift < 0 )
reg <<= -(map->format.reg_shift);
return reg;
}
static int _regmap_raw_write_impl(struct regmap *map, unsigned int reg,
const void *val, size_t val_len, bool noinc)
{
struct regmap_range_node *range;
unsigned long flags;
void *work_val = map->work_buf + map->format.reg_bytes +
map->format.pad_bytes;
void *buf;
int ret = -ENOTSUPP;
size_t len;
int i;
/* Check for unwritable or noinc registers in range
* before we start
*/
if (!regmap_writeable_noinc(map, reg)) {
for (i = 0 ; i < val_len / map->format.val_bytes; i++) {
unsigned int element =
reg + regmap_get_offset(map, i);
if (!regmap_writeable(map, element) ||
regmap_writeable_noinc(map, element))
return -EINVAL;
}
}
if (!map->cache_bypass && map->format.parse_val) {
unsigned int ival, offset;
int val_bytes = map->format.val_bytes;
/* Cache the last written value for noinc writes */
i = noinc ? val_len - val_bytes : 0 ;
for (; i < val_len; i += val_bytes) {
ival = map->format.parse_val(val + i);
offset = noinc ? 0 : regmap_get_offset(map, i / val_bytes);
ret = regcache_write(map, reg + offset, ival);
if (ret) {
dev_err(map->dev,
"Error in caching of register: %x ret: %d\n" ,
reg + offset, ret);
return ret;
}
}
if (map->cache_only) {
map->cache_dirty = true ;
return 0 ;
}
}
range = _regmap_range_lookup(map, reg);
if (range) {
int val_num = val_len / map->format.val_bytes;
int win_offset = (reg - range->range_min) % range->window_len;
int win_residue = range->window_len - win_offset;
/* If the write goes beyond the end of the window split it */
while (val_num > win_residue) {
dev_dbg(map->dev, "Writing window %d/%zu\n" ,
win_residue, val_len / map->format.val_bytes);
ret = _regmap_raw_write_impl(map, reg, val,
win_residue *
map->format.val_bytes, noinc);
if (ret != 0 )
return ret;
reg += win_residue;
val_num -= win_residue;
val += win_residue * map->format.val_bytes;
val_len -= win_residue * map->format.val_bytes;
win_offset = (reg - range->range_min) %
range->window_len;
win_residue = range->window_len - win_offset;
}
ret = _regmap_select_page(map, ®, range, noinc ? 1 : val_num);
if (ret != 0 )
return ret;
}
reg = regmap_reg_addr(map, reg);
map->format.format_reg(map->work_buf, reg, map->reg_shift);
regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
map->write_flag_mask);
/*
* Essentially all I / O mechanisms will be faster with a single
* buffer to write . Since register syncs often generate raw
* writes of single registers optimise that case .
*/
if (val != work_val && val_len == map->format.val_bytes) {
memcpy(work_val, val, map->format.val_bytes);
val = work_val;
}
if (map->async && map->bus && map->bus->async_write) {
struct regmap_async *async;
trace_regmap_async_write_start(map, reg, val_len);
spin_lock_irqsave(&map->async_lock, flags);
async = list_first_entry_or_null(&map->async_free,
struct regmap_async,
list);
if (async)
list_del(&async->list);
spin_unlock_irqrestore(&map->async_lock, flags);
if (!async) {
async = map->bus->async_alloc();
if (!async)
return -ENOMEM;
async->work_buf = kzalloc(map->format.buf_size,
GFP_KERNEL | GFP_DMA);
if (!async->work_buf) {
kfree(async);
return -ENOMEM;
}
}
async->map = map;
/* If the caller supplied the value we can use it safely. */
memcpy(async->work_buf, map->work_buf, map->format.pad_bytes +
map->format.reg_bytes + map->format.val_bytes);
spin_lock_irqsave(&map->async_lock, flags);
list_add_tail(&async->list, &map->async_list);
spin_unlock_irqrestore(&map->async_lock, flags);
if (val != work_val)
ret = map->bus->async_write(map->bus_context,
async->work_buf,
map->format.reg_bytes +
map->format.pad_bytes,
val, val_len, async);
else
ret = map->bus->async_write(map->bus_context,
async->work_buf,
map->format.reg_bytes +
map->format.pad_bytes +
val_len, NULL, 0 , async);
if (ret != 0 ) {
dev_err(map->dev, "Failed to schedule write: %d\n" ,
ret);
spin_lock_irqsave(&map->async_lock, flags);
list_move(&async->list, &map->async_free);
spin_unlock_irqrestore(&map->async_lock, flags);
}
return ret;
}
trace_regmap_hw_write_start(map, reg, val_len / map->format.val_bytes);
/* If we're doing a single register write we can probably just
* send the work_buf directly , otherwise try to do a gather
* write .
*/
if (val == work_val)
ret = map->write(map->bus_context, map->work_buf,
map->format.reg_bytes +
map->format.pad_bytes +
val_len);
else if (map->bus && map->bus->gather_write)
ret = map->bus->gather_write(map->bus_context, map->work_buf,
map->format.reg_bytes +
map->format.pad_bytes,
val, val_len);
else
ret = -ENOTSUPP;
/* If that didn't work fall back on linearising by hand. */
if (ret == -ENOTSUPP) {
len = map->format.reg_bytes + map->format.pad_bytes + val_len;
buf = kzalloc(len, GFP_KERNEL);
if (!buf)
return -ENOMEM;
memcpy(buf, map->work_buf, map->format.reg_bytes);
memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
val, val_len);
ret = map->write(map->bus_context, buf, len);
kfree(buf);
} else if (ret != 0 && !map->cache_bypass && map->format.parse_val) {
/* regcache_drop_region() takes lock that we already have,
* thus call map - > cache_ops - > drop ( ) directly
*/
if (map->cache_ops && map->cache_ops->drop)
map->cache_ops->drop(map, reg, reg + 1 );
}
trace_regmap_hw_write_done(map, reg, val_len / map->format.val_bytes);
return ret;
}
/**
* regmap_can_raw_write - Test if regmap_raw_write ( ) is supported
*
* @ map : Map to check .
*/
bool regmap_can_raw_write(struct regmap *map)
{
return map->write && map->format.format_val && map->format.format_reg;
}
EXPORT_SYMBOL_GPL(regmap_can_raw_write);
/**
* regmap_get_raw_read_max - Get the maximum size we can read
*
* @ map : Map to check .
*/
size_t regmap_get_raw_read_max(struct regmap *map)
{
return map->max_raw_read;
}
EXPORT_SYMBOL_GPL(regmap_get_raw_read_max);
/**
* regmap_get_raw_write_max - Get the maximum size we can read
*
* @ map : Map to check .
*/
size_t regmap_get_raw_write_max(struct regmap *map)
{
return map->max_raw_write;
}
EXPORT_SYMBOL_GPL(regmap_get_raw_write_max);
static int _regmap_bus_formatted_write(void *context, unsigned int reg,
unsigned int val)
{
int ret;
struct regmap_range_node *range;
struct regmap *map = context;
WARN_ON(!map->format.format_write);
range = _regmap_range_lookup(map, reg);
if (range) {
ret = _regmap_select_page(map, ®, range, 1 );
if (ret != 0 )
return ret;
}
reg = regmap_reg_addr(map, reg);
map->format.format_write(map, reg, val);
trace_regmap_hw_write_start(map, reg, 1 );
ret = map->write(map->bus_context, map->work_buf, map->format.buf_size);
trace_regmap_hw_write_done(map, reg, 1 );
return ret;
}
static int _regmap_bus_reg_write(void *context, unsigned int reg,
unsigned int val)
{
struct regmap *map = context;
struct regmap_range_node *range;
int ret;
range = _regmap_range_lookup(map, reg);
if (range) {
ret = _regmap_select_page(map, ®, range, 1 );
if (ret != 0 )
return ret;
}
reg = regmap_reg_addr(map, reg);
return map->bus->reg_write(map->bus_context, reg, val);
}
static int _regmap_bus_raw_write(void *context, unsigned int reg,
unsigned int val)
{
struct regmap *map = context;
WARN_ON(!map->format.format_val);
map->format.format_val(map->work_buf + map->format.reg_bytes
+ map->format.pad_bytes, val, 0 );
return _regmap_raw_write_impl(map, reg,
map->work_buf +
map->format.reg_bytes +
map->format.pad_bytes,
map->format.val_bytes,
false );
}
static inline void *_regmap_map_get_context(struct regmap *map)
{
return (map->bus || (!map->bus && map->read)) ? map : map->bus_context;
}
int _regmap_write(struct regmap *map, unsigned int reg,
unsigned int val)
{
int ret;
void *context = _regmap_map_get_context(map);
if (!regmap_writeable(map, reg))
return -EIO;
if (!map->cache_bypass && !map->defer_caching) {
ret = regcache_write(map, reg, val);
if (ret != 0 )
return ret;
if (map->cache_only) {
map->cache_dirty = true ;
return 0 ;
}
}
ret = map->reg_write(context, reg, val);
if (ret == 0 ) {
if (regmap_should_log(map))
dev_info(map->dev, "%x <= %x\n" , reg, val);
trace_regmap_reg_write(map, reg, val);
}
return ret;
}
/**
* regmap_write ( ) - Write a value to a single register
*
* @ map : Register map to write to
* @ reg : Register to write to
* @ val : Value to be written
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
{
int ret;
if (!IS_ALIGNED(reg, map->reg_stride))
return -EINVAL;
map->lock(map->lock_arg);
ret = _regmap_write(map, reg, val);
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_write);
/**
* regmap_write_async ( ) - Write a value to a single register asynchronously
*
* @ map : Register map to write to
* @ reg : Register to write to
* @ val : Value to be written
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_write_async(struct regmap *map, unsigned int reg, unsigned int val)
{
int ret;
if (!IS_ALIGNED(reg, map->reg_stride))
return -EINVAL;
map->lock(map->lock_arg);
map->async = true ;
ret = _regmap_write(map, reg, val);
map->async = false ;
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_write_async);
int _regmap_raw_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_len, bool noinc)
{
size_t val_bytes = map->format.val_bytes;
size_t val_count = val_len / val_bytes;
size_t chunk_count, chunk_bytes;
size_t chunk_regs = val_count;
int ret, i;
if (!val_count)
return -EINVAL;
if (map->use_single_write)
chunk_regs = 1 ;
else if (map->max_raw_write && val_len > map->max_raw_write)
chunk_regs = map->max_raw_write / val_bytes;
chunk_count = val_count / chunk_regs;
chunk_bytes = chunk_regs * val_bytes;
/* Write as many bytes as possible with chunk_size */
for (i = 0 ; i < chunk_count; i++) {
ret = _regmap_raw_write_impl(map, reg, val, chunk_bytes, noinc);
if (ret)
return ret;
reg += regmap_get_offset(map, chunk_regs);
val += chunk_bytes;
val_len -= chunk_bytes;
}
/* Write remaining bytes */
if (val_len)
ret = _regmap_raw_write_impl(map, reg, val, val_len, noinc);
return ret;
}
/**
* regmap_raw_write ( ) - Write raw values to one or more registers
*
* @ map : Register map to write to
* @ reg : Initial register to write to
* @ val : Block of data to be written , laid out for direct transmission to the
* device
* @ val_len : Length of data pointed to by val .
*
* This function is intended to be used for things like firmware
* download where a large block of data needs to be transferred to the
* device . No formatting will be done on the data provided .
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_raw_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_len)
{
int ret;
if (!regmap_can_raw_write(map))
return -EINVAL;
if (val_len % map->format.val_bytes)
return -EINVAL;
map->lock(map->lock_arg);
ret = _regmap_raw_write(map, reg, val, val_len, false );
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_raw_write);
static int regmap_noinc_readwrite(struct regmap *map, unsigned int reg,
void *val, unsigned int val_len, bool write)
{
size_t val_bytes = map->format.val_bytes;
size_t val_count = val_len / val_bytes;
unsigned int lastval;
u8 *u8p;
u16 *u16p;
u32 *u32p;
int ret;
int i;
switch (val_bytes) {
case 1 :
u8p = val;
if (write)
lastval = (unsigned int )u8p[val_count - 1 ];
break ;
case 2 :
u16p = val;
if (write)
lastval = (unsigned int )u16p[val_count - 1 ];
break ;
case 4 :
u32p = val;
if (write)
lastval = (unsigned int )u32p[val_count - 1 ];
break ;
default :
return -EINVAL;
}
/*
* Update the cache with the last value we write , the rest is just
* gone down in the hardware FIFO . We can ' t cache FIFOs . This makes
* sure a single read from the cache will work .
*/
if (write) {
if (!map->cache_bypass && !map->defer_caching) {
ret = regcache_write(map, reg, lastval);
if (ret != 0 )
return ret;
if (map->cache_only) {
map->cache_dirty = true ;
return 0 ;
}
}
ret = map->bus->reg_noinc_write(map->bus_context, reg, val, val_count);
} else {
ret = map->bus->reg_noinc_read(map->bus_context, reg, val, val_count);
}
if (!ret && regmap_should_log(map)) {
dev_info(map->dev, "%x %s [" , reg, write ? "<=" : "=>" );
for (i = 0 ; i < val_count; i++) {
switch (val_bytes) {
case 1 :
pr_cont("%x" , u8p[i]);
break ;
case 2 :
pr_cont("%x" , u16p[i]);
break ;
case 4 :
pr_cont("%x" , u32p[i]);
break ;
default :
break ;
}
if (i == (val_count - 1 ))
pr_cont("]\n" );
else
pr_cont("," );
}
}
return 0 ;
}
/**
* regmap_noinc_write ( ) : Write data to a register without incrementing the
* register number
*
* @ map : Register map to write to
* @ reg : Register to write to
* @ val : Pointer to data buffer
* @ val_len : Length of output buffer in bytes .
*
* The regmap API usually assumes that bulk bus write operations will write a
* range of registers . Some devices have certain registers for which a write
* operation can write to an internal FIFO .
*
* The target register must be volatile but registers after it can be
* completely unrelated cacheable registers .
*
* This will attempt multiple writes as required to write val_len bytes .
*
* A value of zero will be returned on success , a negative errno will be
* returned in error cases .
*/
int regmap_noinc_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_len)
{
size_t write_len;
int ret;
if (!map->write && !(map->bus && map->bus->reg_noinc_write))
return -EINVAL;
if (val_len % map->format.val_bytes)
return -EINVAL;
if (!IS_ALIGNED(reg, map->reg_stride))
return -EINVAL;
if (val_len == 0 )
return -EINVAL;
map->lock(map->lock_arg);
if (!regmap_volatile(map, reg) || !regmap_writeable_noinc(map, reg)) {
ret = -EINVAL;
goto out_unlock;
}
/*
* Use the accelerated operation if we can . The val drops the const
* typing in order to facilitate code reuse in regmap_noinc_readwrite ( ) .
*/
if (map->bus->reg_noinc_write) {
ret = regmap_noinc_readwrite(map, reg, (void *)val, val_len, true );
goto out_unlock;
}
while (val_len) {
if (map->max_raw_write && map->max_raw_write < val_len)
write_len = map->max_raw_write;
else
write_len = val_len;
ret = _regmap_raw_write(map, reg, val, write_len, true );
if (ret)
goto out_unlock;
val = ((u8 *)val) + write_len;
val_len -= write_len;
}
out_unlock:
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_noinc_write);
/**
* regmap_field_update_bits_base ( ) - Perform a read / modify / write cycle a
* register field .
*
* @ field : Register field to write to
* @ mask : Bitmask to change
* @ val : Value to be written
* @ change : Boolean indicating if a write was done
* @ async : Boolean indicating asynchronously
* @ force : Boolean indicating use force update
*
* Perform a read / modify / write cycle on the register field with change ,
* async , force option .
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_field_update_bits_base(struct regmap_field *field,
unsigned int mask, unsigned int val,
bool *change, bool async, bool force)
{
mask = (mask << field->shift) & field->mask;
return regmap_update_bits_base(field->regmap, field->reg,
mask, val << field->shift,
change, async, force);
}
EXPORT_SYMBOL_GPL(regmap_field_update_bits_base);
/**
* regmap_field_test_bits ( ) - Check if all specified bits are set in a
* register field .
*
* @ field : Register field to operate on
* @ bits : Bits to test
*
* Returns - 1 if the underlying regmap_field_read ( ) fails , 0 if at least one of the
* tested bits is not set and 1 if all tested bits are set .
*/
int regmap_field_test_bits(struct regmap_field *field, unsigned int bits)
{
unsigned int val, ret;
ret = regmap_field_read(field, &val);
if (ret)
return ret;
return (val & bits) == bits;
}
EXPORT_SYMBOL_GPL(regmap_field_test_bits);
/**
* regmap_fields_update_bits_base ( ) - Perform a read / modify / write cycle a
* register field with port ID
*
* @ field : Register field to write to
* @ id : port ID
* @ mask : Bitmask to change
* @ val : Value to be written
* @ change : Boolean indicating if a write was done
* @ async : Boolean indicating asynchronously
* @ force : Boolean indicating use force update
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_fields_update_bits_base(struct regmap_field *field, unsigned int id,
unsigned int mask, unsigned int val,
bool *change, bool async, bool force)
{
if (id >= field->id_size)
return -EINVAL;
mask = (mask << field->shift) & field->mask;
return regmap_update_bits_base(field->regmap,
field->reg + (field->id_offset * id),
mask, val << field->shift,
change, async, force);
}
EXPORT_SYMBOL_GPL(regmap_fields_update_bits_base);
/**
* regmap_bulk_write ( ) - Write multiple registers to the device
*
* @ map : Register map to write to
* @ reg : First register to be write from
* @ val : Block of data to be written , in native register size for device
* @ val_count : Number of registers to write
*
* This function is intended to be used for writing a large block of
* data to the device either in single transfer or multiple transfer .
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
size_t val_count)
{
int ret = 0 , i;
size_t val_bytes = map->format.val_bytes;
if (!IS_ALIGNED(reg, map->reg_stride))
return -EINVAL;
/*
* Some devices don ' t support bulk write , for them we have a series of
* single write operations .
*/
if (!map->write || !map->format.parse_inplace) {
map->lock(map->lock_arg);
for (i = 0 ; i < val_count; i++) {
unsigned int ival;
switch (val_bytes) {
case 1 :
ival = *(u8 *)(val + (i * val_bytes));
break ;
case 2 :
ival = *(u16 *)(val + (i * val_bytes));
break ;
case 4 :
ival = *(u32 *)(val + (i * val_bytes));
break ;
default :
ret = -EINVAL;
goto out;
}
ret = _regmap_write(map,
reg + regmap_get_offset(map, i),
ival);
if (ret != 0 )
goto out;
}
out:
map->unlock(map->lock_arg);
} else {
void *wval;
wval = kmemdup_array(val, val_count, val_bytes, map->alloc_flags);
if (!wval)
return -ENOMEM;
for (i = 0 ; i < val_count * val_bytes; i += val_bytes)
map->format.parse_inplace(wval + i);
ret = regmap_raw_write(map, reg, wval, val_bytes * val_count);
kfree(wval);
}
if (!ret)
trace_regmap_bulk_write(map, reg, val, val_bytes * val_count);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_bulk_write);
/*
* _ regmap_raw_multi_reg_write ( )
*
* the ( register , newvalue ) pairs in regs have not been formatted , but
* they are all in the same page and have been changed to being page
* relative . The page register has been written if that was necessary .
*/
static int _regmap_raw_multi_reg_write(struct regmap *map,
const struct reg_sequence *regs,
size_t num_regs)
{
int ret;
void *buf;
int i;
u8 *u8;
size_t val_bytes = map->format.val_bytes;
size_t reg_bytes = map->format.reg_bytes;
size_t pad_bytes = map->format.pad_bytes;
size_t pair_size = reg_bytes + pad_bytes + val_bytes;
size_t len = pair_size * num_regs;
if (!len)
return -EINVAL;
buf = kzalloc(len, GFP_KERNEL);
if (!buf)
return -ENOMEM;
/* We have to linearise by hand. */
u8 = buf;
for (i = 0 ; i < num_regs; i++) {
unsigned int reg = regs[i].reg;
unsigned int val = regs[i].def;
trace_regmap_hw_write_start(map, reg, 1 );
reg = regmap_reg_addr(map, reg);
map->format.format_reg(u8, reg, map->reg_shift);
u8 += reg_bytes + pad_bytes;
map->format.format_val(u8, val, 0 );
u8 += val_bytes;
}
u8 = buf;
*u8 |= map->write_flag_mask;
ret = map->write(map->bus_context, buf, len);
kfree(buf);
for (i = 0 ; i < num_regs; i++) {
int reg = regs[i].reg;
trace_regmap_hw_write_done(map, reg, 1 );
}
return ret;
}
static unsigned int _regmap_register_page(struct regmap *map,
unsigned int reg,
struct regmap_range_node *range)
{
unsigned int win_page = (reg - range->range_min) / range->window_len;
return win_page;
}
static int _regmap_range_multi_paged_reg_write(struct regmap *map,
struct reg_sequence *regs,
size_t num_regs)
{
int ret;
int i, n;
struct reg_sequence *base;
unsigned int this_page = 0 ;
unsigned int page_change = 0 ;
/*
* the set of registers are not neccessarily in order , but
* since the order of write must be preserved this algorithm
* chops the set each time the page changes . This also applies
* if there is a delay required at any point in the sequence .
*/
base = regs;
for (i = 0 , n = 0 ; i < num_regs; i++, n++) {
unsigned int reg = regs[i].reg;
struct regmap_range_node *range;
range = _regmap_range_lookup(map, reg);
if (range) {
unsigned int win_page = _regmap_register_page(map, reg,
range);
if (i == 0 )
this_page = win_page;
if (win_page != this_page) {
this_page = win_page;
page_change = 1 ;
}
}
/* If we have both a page change and a delay make sure to
* write the regs and apply the delay before we change the
* page .
*/
if (page_change || regs[i].delay_us) {
/* For situations where the first write requires
* a delay we need to make sure we don ' t call
* raw_multi_reg_write with n = 0
* This can ' t occur with page breaks as we
* never write on the first iteration
*/
if (regs[i].delay_us && i == 0 )
n = 1 ;
ret = _regmap_raw_multi_reg_write(map, base, n);
if (ret != 0 )
return ret;
if (regs[i].delay_us) {
if (map->can_sleep)
fsleep(regs[i].delay_us);
else
udelay(regs[i].delay_us);
}
base += n;
n = 0 ;
if (page_change) {
ret = _regmap_select_page(map,
&base[n].reg,
range, 1 );
if (ret != 0 )
return ret;
page_change = 0 ;
}
}
}
if (n > 0 )
return _regmap_raw_multi_reg_write(map, base, n);
return 0 ;
}
static int _regmap_multi_reg_write(struct regmap *map,
const struct reg_sequence *regs,
size_t num_regs)
{
int i;
int ret;
if (!map->can_multi_write) {
for (i = 0 ; i < num_regs; i++) {
ret = _regmap_write(map, regs[i].reg, regs[i].def);
if (ret != 0 )
return ret;
if (regs[i].delay_us) {
if (map->can_sleep)
fsleep(regs[i].delay_us);
else
udelay(regs[i].delay_us);
}
}
return 0 ;
}
if (!map->format.parse_inplace)
return -EINVAL;
if (map->writeable_reg)
for (i = 0 ; i < num_regs; i++) {
int reg = regs[i].reg;
if (!map->writeable_reg(map->dev, reg))
return -EINVAL;
if (!IS_ALIGNED(reg, map->reg_stride))
return -EINVAL;
}
if (!map->cache_bypass) {
for (i = 0 ; i < num_regs; i++) {
unsigned int val = regs[i].def;
unsigned int reg = regs[i].reg;
ret = regcache_write(map, reg, val);
if (ret) {
dev_err(map->dev,
"Error in caching of register: %x ret: %d\n" ,
reg, ret);
return ret;
}
}
if (map->cache_only) {
map->cache_dirty = true ;
return 0 ;
}
}
WARN_ON(!map->bus);
for (i = 0 ; i < num_regs; i++) {
unsigned int reg = regs[i].reg;
struct regmap_range_node *range;
/* Coalesce all the writes between a page break or a delay
* in a sequence
*/
range = _regmap_range_lookup(map, reg);
if (range || regs[i].delay_us) {
size_t len = sizeof (struct reg_sequence)*num_regs;
struct reg_sequence *base = kmemdup(regs, len,
GFP_KERNEL);
if (!base)
return -ENOMEM;
ret = _regmap_range_multi_paged_reg_write(map, base,
num_regs);
kfree(base);
return ret;
}
}
return _regmap_raw_multi_reg_write(map, regs, num_regs);
}
/**
* regmap_multi_reg_write ( ) - Write multiple registers to the device
*
* @ map : Register map to write to
* @ regs : Array of structures containing register , value to be written
* @ num_regs : Number of registers to write
*
* Write multiple registers to the device where the set of register , value
* pairs are supplied in any order , possibly not all in a single range .
*
* The ' normal ' block write mode will send ultimately send data on the
* target bus as R , V1 , V2 , V3 , . . , Vn where successively higher registers are
* addressed . However , this alternative block multi write mode will send
* the data as R1 , V1 , R2 , V2 , . . , Rn , Vn on the target bus . The target device
* must of course support the mode .
*
* A value of zero will be returned on success , a negative errno will be
* returned in error cases .
*/
int regmap_multi_reg_write(struct regmap *map, const struct reg_sequence *regs,
int num_regs)
{
int ret;
map->lock(map->lock_arg);
ret = _regmap_multi_reg_write(map, regs, num_regs);
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_multi_reg_write);
/**
* regmap_multi_reg_write_bypassed ( ) - Write multiple registers to the
* device but not the cache
*
* @ map : Register map to write to
* @ regs : Array of structures containing register , value to be written
* @ num_regs : Number of registers to write
*
* Write multiple registers to the device but not the cache where the set
* of register are supplied in any order .
*
* This function is intended to be used for writing a large block of data
* atomically to the device in single transfer for those I2C client devices
* that implement this alternative block write mode .
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_multi_reg_write_bypassed(struct regmap *map,
const struct reg_sequence *regs,
int num_regs)
{
int ret;
bool bypass;
map->lock(map->lock_arg);
bypass = map->cache_bypass;
map->cache_bypass = true ;
ret = _regmap_multi_reg_write(map, regs, num_regs);
map->cache_bypass = bypass;
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_multi_reg_write_bypassed);
/**
* regmap_raw_write_async ( ) - Write raw values to one or more registers
* asynchronously
*
* @ map : Register map to write to
* @ reg : Initial register to write to
* @ val : Block of data to be written , laid out for direct transmission to the
* device . Must be valid until regmap_async_complete ( ) is called .
* @ val_len : Length of data pointed to by val .
*
* This function is intended to be used for things like firmware
* download where a large block of data needs to be transferred to the
* device . No formatting will be done on the data provided .
*
* If supported by the underlying bus the write will be scheduled
* asynchronously , helping maximise I / O speed on higher speed buses
* like SPI . regmap_async_complete ( ) can be called to ensure that all
* asynchrnous writes have been completed .
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_raw_write_async(struct regmap *map, unsigned int reg,
const void *val, size_t val_len)
{
int ret;
if (val_len % map->format.val_bytes)
return -EINVAL;
if (!IS_ALIGNED(reg, map->reg_stride))
return -EINVAL;
map->lock(map->lock_arg);
map->async = true ;
ret = _regmap_raw_write(map, reg, val, val_len, false );
map->async = false ;
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_raw_write_async);
static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
unsigned int val_len, bool noinc)
{
struct regmap_range_node *range;
int ret;
if (!map->read)
return -EINVAL;
range = _regmap_range_lookup(map, reg);
if (range) {
ret = _regmap_select_page(map, ®, range,
noinc ? 1 : val_len / map->format.val_bytes);
if (ret != 0 )
return ret;
}
reg = regmap_reg_addr(map, reg);
map->format.format_reg(map->work_buf, reg, map->reg_shift);
regmap_set_work_buf_flag_mask(map, map->format.reg_bytes,
map->read_flag_mask);
trace_regmap_hw_read_start(map, reg, val_len / map->format.val_bytes);
ret = map->read(map->bus_context, map->work_buf,
map->format.reg_bytes + map->format.pad_bytes,
val, val_len);
trace_regmap_hw_read_done(map, reg, val_len / map->format.val_bytes);
return ret;
}
static int _regmap_bus_reg_read(void *context, unsigned int reg,
unsigned int *val)
{
struct regmap *map = context;
struct regmap_range_node *range;
int ret;
range = _regmap_range_lookup(map, reg);
if (range) {
ret = _regmap_select_page(map, ®, range, 1 );
if (ret != 0 )
return ret;
}
reg = regmap_reg_addr(map, reg);
return map->bus->reg_read(map->bus_context, reg, val);
}
static int _regmap_bus_read(void *context, unsigned int reg,
unsigned int *val)
{
int ret;
struct regmap *map = context;
void *work_val = map->work_buf + map->format.reg_bytes +
map->format.pad_bytes;
if (!map->format.parse_val)
return -EINVAL;
ret = _regmap_raw_read(map, reg, work_val, map->format.val_bytes, false );
if (ret == 0 )
*val = map->format.parse_val(work_val);
return ret;
}
static int _regmap_read(struct regmap *map, unsigned int reg,
unsigned int *val)
{
int ret;
void *context = _regmap_map_get_context(map);
if (!map->cache_bypass) {
ret = regcache_read(map, reg, val);
if (ret == 0 )
return 0 ;
}
if (map->cache_only)
return -EBUSY;
if (!regmap_readable(map, reg))
return -EIO;
ret = map->reg_read(context, reg, val);
if (ret == 0 ) {
if (regmap_should_log(map))
dev_info(map->dev, "%x => %x\n" , reg, *val);
trace_regmap_reg_read(map, reg, *val);
if (!map->cache_bypass)
regcache_write(map, reg, *val);
}
return ret;
}
/**
* regmap_read ( ) - Read a value from a single register
*
* @ map : Register map to read from
* @ reg : Register to be read from
* @ val : Pointer to store read value
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
{
int ret;
if (!IS_ALIGNED(reg, map->reg_stride))
return -EINVAL;
map->lock(map->lock_arg);
ret = _regmap_read(map, reg, val);
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_read);
/**
* regmap_read_bypassed ( ) - Read a value from a single register direct
* from the device , bypassing the cache
*
* @ map : Register map to read from
* @ reg : Register to be read from
* @ val : Pointer to store read value
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_read_bypassed(struct regmap *map, unsigned int reg, unsigned int *val)
{
int ret;
bool bypass, cache_only;
if (!IS_ALIGNED(reg, map->reg_stride))
return -EINVAL;
map->lock(map->lock_arg);
bypass = map->cache_bypass;
cache_only = map->cache_only;
map->cache_bypass = true ;
map->cache_only = false ;
ret = _regmap_read(map, reg, val);
map->cache_bypass = bypass;
map->cache_only = cache_only;
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_read_bypassed);
/**
* regmap_raw_read ( ) - Read raw data from the device
*
* @ map : Register map to read from
* @ reg : First register to be read from
* @ val : Pointer to store read value
* @ val_len : Size of data to read
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
size_t val_len)
{
size_t val_bytes = map->format.val_bytes;
size_t val_count = val_len / val_bytes;
unsigned int v;
int ret, i;
if (val_len % map->format.val_bytes)
return -EINVAL;
if (!IS_ALIGNED(reg, map->reg_stride))
return -EINVAL;
if (val_count == 0 )
return -EINVAL;
map->lock(map->lock_arg);
if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
map->cache_type == REGCACHE_NONE) {
size_t chunk_count, chunk_bytes;
size_t chunk_regs = val_count;
if (!map->cache_bypass && map->cache_only) {
ret = -EBUSY;
goto out;
}
if (!map->read) {
ret = -ENOTSUPP;
goto out;
}
if (map->use_single_read)
chunk_regs = 1 ;
else if (map->max_raw_read && val_len > map->max_raw_read)
chunk_regs = map->max_raw_read / val_bytes;
chunk_count = val_count / chunk_regs;
chunk_bytes = chunk_regs * val_bytes;
/* Read bytes that fit into whole chunks */
for (i = 0 ; i < chunk_count; i++) {
ret = _regmap_raw_read(map, reg, val, chunk_bytes, false );
if (ret != 0 )
goto out;
reg += regmap_get_offset(map, chunk_regs);
val += chunk_bytes;
val_len -= chunk_bytes;
}
/* Read remaining bytes */
if (val_len) {
ret = _regmap_raw_read(map, reg, val, val_len, false );
if (ret != 0 )
goto out;
}
} else {
/* Otherwise go word by word for the cache; should be low
* cost as we expect to hit the cache .
*/
for (i = 0 ; i < val_count; i++) {
ret = _regmap_read(map, reg + regmap_get_offset(map, i),
&v);
if (ret != 0 )
goto out;
map->format.format_val(val + (i * val_bytes), v, 0 );
}
}
out:
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_raw_read);
/**
* regmap_noinc_read ( ) : Read data from a register without incrementing the
* register number
*
* @ map : Register map to read from
* @ reg : Register to read from
* @ val : Pointer to data buffer
* @ val_len : Length of output buffer in bytes .
*
* The regmap API usually assumes that bulk read operations will read a
* range of registers . Some devices have certain registers for which a read
* operation read will read from an internal FIFO .
*
* The target register must be volatile but registers after it can be
* completely unrelated cacheable registers .
*
* This will attempt multiple reads as required to read val_len bytes .
*
* A value of zero will be returned on success , a negative errno will be
* returned in error cases .
*/
int regmap_noinc_read(struct regmap *map, unsigned int reg,
void *val, size_t val_len)
{
size_t read_len;
int ret;
if (!map->read)
return -ENOTSUPP;
if (val_len % map->format.val_bytes)
return -EINVAL;
if (!IS_ALIGNED(reg, map->reg_stride))
return -EINVAL;
if (val_len == 0 )
return -EINVAL;
map->lock(map->lock_arg);
if (!regmap_volatile(map, reg) || !regmap_readable_noinc(map, reg)) {
ret = -EINVAL;
goto out_unlock;
}
/*
* We have not defined the FIFO semantics for cache , as the
* cache is just one value deep . Should we return the last
* written value ? Just avoid this by always reading the FIFO
* even when using cache . Cache only will not work .
*/
if (!map->cache_bypass && map->cache_only) {
ret = -EBUSY;
goto out_unlock;
}
/* Use the accelerated operation if we can */
if (map->bus->reg_noinc_read) {
ret = regmap_noinc_readwrite(map, reg, val, val_len, false );
goto out_unlock;
}
while (val_len) {
if (map->max_raw_read && map->max_raw_read < val_len)
read_len = map->max_raw_read;
else
read_len = val_len;
ret = _regmap_raw_read(map, reg, val, read_len, true );
if (ret)
goto out_unlock;
val = ((u8 *)val) + read_len;
val_len -= read_len;
}
out_unlock:
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_noinc_read);
/**
* regmap_field_read ( ) : Read a value to a single register field
*
* @ field : Register field to read from
* @ val : Pointer to store read value
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_field_read(struct regmap_field *field, unsigned int *val)
{
int ret;
unsigned int reg_val;
ret = regmap_read(field->regmap, field->reg, ®_val);
if (ret != 0 )
return ret;
reg_val &= field->mask;
reg_val >>= field->shift;
*val = reg_val;
return ret;
}
EXPORT_SYMBOL_GPL(regmap_field_read);
/**
* regmap_fields_read ( ) - Read a value to a single register field with port ID
*
* @ field : Register field to read from
* @ id : port ID
* @ val : Pointer to store read value
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_fields_read(struct regmap_field *field, unsigned int id,
unsigned int *val)
{
int ret;
unsigned int reg_val;
if (id >= field->id_size)
return -EINVAL;
ret = regmap_read(field->regmap,
field->reg + (field->id_offset * id),
®_val);
if (ret != 0 )
return ret;
reg_val &= field->mask;
reg_val >>= field->shift;
*val = reg_val;
return ret;
}
EXPORT_SYMBOL_GPL(regmap_fields_read);
static int _regmap_bulk_read(struct regmap *map, unsigned int reg,
const unsigned int *regs, void *val, size_t val_count)
{
u32 *u32 = val;
u16 *u16 = val;
u8 *u8 = val;
int ret, i;
map->lock(map->lock_arg);
for (i = 0 ; i < val_count; i++) {
unsigned int ival;
if (regs) {
if (!IS_ALIGNED(regs[i], map->reg_stride)) {
ret = -EINVAL;
goto out;
}
ret = _regmap_read(map, regs[i], &ival);
} else {
ret = _regmap_read(map, reg + regmap_get_offset(map, i), &ival);
}
if (ret != 0 )
goto out;
switch (map->format.val_bytes) {
case 4 :
u32[i] = ival;
break ;
case 2 :
u16[i] = ival;
break ;
case 1 :
u8[i] = ival;
break ;
default :
ret = -EINVAL;
goto out;
}
}
out:
map->unlock(map->lock_arg);
return ret;
}
/**
* regmap_bulk_read ( ) - Read multiple sequential registers from the device
*
* @ map : Register map to read from
* @ reg : First register to be read from
* @ val : Pointer to store read value , in native register size for device
* @ val_count : Number of registers to read
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
size_t val_count)
{
int ret, i;
size_t val_bytes = map->format.val_bytes;
bool vol = regmap_volatile_range(map, reg, val_count);
if (!IS_ALIGNED(reg, map->reg_stride))
return -EINVAL;
if (val_count == 0 )
return -EINVAL;
if (map->read && map->format.parse_inplace && (vol || map->cache_type == REGCACHE_NONE)) {
ret = regmap_raw_read(map, reg, val, val_bytes * val_count);
if (ret != 0 )
return ret;
for (i = 0 ; i < val_count * val_bytes; i += val_bytes)
map->format.parse_inplace(val + i);
} else {
ret = _regmap_bulk_read(map, reg, NULL, val, val_count);
}
if (!ret)
trace_regmap_bulk_read(map, reg, val, val_bytes * val_count);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_bulk_read);
/**
* regmap_multi_reg_read ( ) - Read multiple non - sequential registers from the device
*
* @ map : Register map to read from
* @ regs : Array of registers to read from
* @ val : Pointer to store read value , in native register size for device
* @ val_count : Number of registers to read
*
* A value of zero will be returned on success , a negative errno will
* be returned in error cases .
*/
int regmap_multi_reg_read(struct regmap *map, const unsigned int *regs, void *val,
size_t val_count)
{
if (val_count == 0 )
return -EINVAL;
return _regmap_bulk_read(map, 0 , regs, val, val_count);
}
EXPORT_SYMBOL_GPL(regmap_multi_reg_read);
static int _regmap_update_bits(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change, bool force_write)
{
int ret;
unsigned int tmp, orig;
if (change)
*change = false ;
if (regmap_volatile(map, reg) && map->reg_update_bits) {
reg = regmap_reg_addr(map, reg);
ret = map->reg_update_bits(map->bus_context, reg, mask, val);
if (ret == 0 && change)
*change = true ;
} else {
ret = _regmap_read(map, reg, &orig);
if (ret != 0 )
return ret;
tmp = orig & ~mask;
tmp |= val & mask;
if (force_write || (tmp != orig) || map->force_write_field) {
ret = _regmap_write(map, reg, tmp);
if (ret == 0 && change)
*change = true ;
}
}
return ret;
}
/**
* regmap_update_bits_base ( ) - Perform a read / modify / write cycle on a register
*
* @ map : Register map to update
* @ reg : Register to update
* @ mask : Bitmask to change
* @ val : New value for bitmask
* @ change : Boolean indicating if a write was done
* @ async : Boolean indicating asynchronously
* @ force : Boolean indicating use force update
*
* Perform a read / modify / write cycle on a register map with change , async , force
* options .
*
* If async is true :
*
* With most buses the read must be done synchronously so this is most useful
* for devices with a cache which do not need to interact with the hardware to
* determine the current register value .
*
* Returns zero for success , a negative number on error .
*/
int regmap_update_bits_base(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change, bool async, bool force)
{
int ret;
map->lock(map->lock_arg);
map->async = async;
ret = _regmap_update_bits(map, reg, mask, val, change, force);
map->async = false ;
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_update_bits_base);
/**
* regmap_test_bits ( ) - Check if all specified bits are set in a register .
*
* @ map : Register map to operate on
* @ reg : Register to read from
* @ bits : Bits to test
*
* Returns 0 if at least one of the tested bits is not set , 1 if all tested
* bits are set and a negative error number if the underlying regmap_read ( )
* fails .
*/
int regmap_test_bits(struct regmap *map, unsigned int reg, unsigned int bits)
{
unsigned int val, ret;
ret = regmap_read(map, reg, &val);
if (ret)
return ret;
return (val & bits) == bits;
}
EXPORT_SYMBOL_GPL(regmap_test_bits);
void regmap_async_complete_cb(struct regmap_async *async, int ret)
{
struct regmap *map = async->map;
bool wake;
trace_regmap_async_io_complete(map);
spin_lock(&map->async_lock);
list_move(&async->list, &map->async_free);
wake = list_empty(&map->async_list);
if (ret != 0 )
map->async_ret = ret;
spin_unlock(&map->async_lock);
if (wake)
wake_up(&map->async_waitq);
}
EXPORT_SYMBOL_GPL(regmap_async_complete_cb);
static int regmap_async_is_done(struct regmap *map)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&map->async_lock, flags);
ret = list_empty(&map->async_list);
spin_unlock_irqrestore(&map->async_lock, flags);
return ret;
}
/**
* regmap_async_complete - Ensure all asynchronous I / O has completed .
*
* @ map : Map to operate on .
*
* Blocks until any pending asynchronous I / O has completed . Returns
* an error code for any failed I / O operations .
*/
int regmap_async_complete(struct regmap *map)
{
unsigned long flags;
int ret;
/* Nothing to do with no async support */
if (!map->bus || !map->bus->async_write)
return 0 ;
trace_regmap_async_complete_start(map);
wait_event(map->async_waitq, regmap_async_is_done(map));
spin_lock_irqsave(&map->async_lock, flags);
ret = map->async_ret;
map->async_ret = 0 ;
spin_unlock_irqrestore(&map->async_lock, flags);
trace_regmap_async_complete_done(map);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_async_complete);
/**
* regmap_register_patch - Register and apply register updates to be applied
* on device initialistion
*
* @ map : Register map to apply updates to .
* @ regs : Values to update .
* @ num_regs : Number of entries in regs .
*
* Register a set of register updates to be applied to the device
* whenever the device registers are synchronised with the cache and
* apply them immediately . Typically this is used to apply
* corrections to be applied to the device defaults on startup , such
* as the updates some vendors provide to undocumented registers .
*
* The caller must ensure that this function cannot be called
* concurrently with either itself or regcache_sync ( ) .
*/
int regmap_register_patch(struct regmap *map, const struct reg_sequence *regs,
int num_regs)
{
struct reg_sequence *p;
int ret;
bool bypass;
if (WARN_ONCE(num_regs <= 0 , "invalid registers number (%d)\n" ,
num_regs))
return 0 ;
p = krealloc(map->patch,
sizeof (struct reg_sequence) * (map->patch_regs + num_regs),
GFP_KERNEL);
if (p) {
memcpy(p + map->patch_regs, regs, num_regs * sizeof (*regs));
map->patch = p;
map->patch_regs += num_regs;
} else {
return -ENOMEM;
}
map->lock(map->lock_arg);
bypass = map->cache_bypass;
map->cache_bypass = true ;
map->async = true ;
ret = _regmap_multi_reg_write(map, regs, num_regs);
map->async = false ;
map->cache_bypass = bypass;
map->unlock(map->lock_arg);
regmap_async_complete(map);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_register_patch);
/**
* regmap_get_val_bytes ( ) - Report the size of a register value
*
* @ map : Register map to operate on .
*
* Report the size of a register value , mainly intended to for use by
* generic infrastructure built on top of regmap .
*/
int regmap_get_val_bytes(struct regmap *map)
{
if (map->format.format_write)
return -EINVAL;
return map->format.val_bytes;
}
EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
/**
* regmap_get_max_register ( ) - Report the max register value
*
* @ map : Register map to operate on .
*
* Report the max register value , mainly intended to for use by
* generic infrastructure built on top of regmap .
*/
int regmap_get_max_register(struct regmap *map)
{
return map->max_register_is_set ? map->max_register : -EINVAL;
}
EXPORT_SYMBOL_GPL(regmap_get_max_register);
/**
* regmap_get_reg_stride ( ) - Report the register address stride
*
* @ map : Register map to operate on .
*
* Report the register address stride , mainly intended to for use by
* generic infrastructure built on top of regmap .
*/
int regmap_get_reg_stride(struct regmap *map)
{
return map->reg_stride;
}
EXPORT_SYMBOL_GPL(regmap_get_reg_stride);
/**
* regmap_might_sleep ( ) - Returns whether a regmap access might sleep .
*
* @ map : Register map to operate on .
*
* Returns true if an access to the register might sleep , else false .
*/
bool regmap_might_sleep(struct regmap *map)
{
return map->can_sleep;
}
EXPORT_SYMBOL_GPL(regmap_might_sleep);
int regmap_parse_val(struct regmap *map, const void *buf,
unsigned int *val)
{
if (!map->format.parse_val)
return -EINVAL;
*val = map->format.parse_val(buf);
return 0 ;
}
EXPORT_SYMBOL_GPL(regmap_parse_val);
static int __init regmap_initcall(void )
{
regmap_debugfs_initcall();
return 0 ;
}
postcore_initcall(regmap_initcall);
Messung V0.5 in Prozent C=92 H=95 G=93
¤ Dauer der Verarbeitung: 0.55 Sekunden
(vorverarbeitet am 2026-10-11)
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