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regmap: Updates for v3.8

Browse source 
Quite a few enhancements this time around, helpers and diagnostics for
 the most part which is good to see:
 
 - Addition of table based lookups for the register access checks from
   Davide Ciminaghi, making life easier for drivers with big blocks of
   similar registers.
 - Allow drivers to get the irqdomain for regmap irq_chips, allowing the
   domain to be used with other APIs.
 - Debug improvements for paged register maps.
 - Performance improvments for some of the diagnostic infrastructure,
   very helpful for devices with large register maps.
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Merge tag 'regmap-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap updates from Mark Brown:
 "Quite a few enhancements this time around, helpers and diagnostics for
  the most part which is good to see:

   - Addition of table based lookups for the register access checks from
     Davide Ciminaghi, making life easier for drivers with big blocks of
     similar registers.
   - Allow drivers to get the irqdomain for regmap irq_chips, allowing
     the domain to be used with other APIs.
   - Debug improvements for paged register maps.
   - Performance improvments for some of the diagnostic infrastructure,
     very helpful for devices with large register maps."

* tag 'regmap-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: debugfs: Cache offsets of valid regions for dump
  regmap: debugfs: Factor out initial seek
  regmap: debugfs: Avoid overflows for very small reads
  regmap: Cache register and value sizes for debugfs
  regmap: introduce tables for readable/writeable/volatile/precious checks
  regmap: core: Report registers in hex when we can't cache
  regmap: Fix printing of size_t variable
  regmap: make lock/unlock functions customizable
  regmap: silence GCC warning
  regmap: Split raw writes that cross window boundaries
  regmap: Make return code checks consistent
  regmap: Factor range lookup out of page selection
  regmap: Provide debugfs read of register ranges
  regmap: Factor out debugfs register read
  regmap: Allow ranges to be named
  regmap: When we sanity check during range adds say what errors we find
  regmap: Rename n_ranges to num_ranges
  regmap: irq: Allow users to retrieve the irq_domain
This commit is contained in:
Linus Torvalds 2012-12-12 07:55:48 -08:00
commit 99b8f42ee2
5 changed files with 457 additions and 106 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

24
drivers/base/regmap/internal.h
View file

@ -15,10 +15,18 @@
#include <linux/regmap.h>
#include <linux/fs.h>
#include <linux/list.h>
struct regmap;
struct regcache_ops;
struct regmap_debugfs_off_cache {
struct list_head list;
off_t min;
off_t max;
unsigned int base_reg;
};
struct regmap_format {
size_t buf_size;
size_t reg_bytes;
@ -31,14 +39,12 @@ struct regmap_format {
unsigned int (*parse_val)(void *buf);
};
typedef void (*regmap_lock)(struct regmap *map);
typedef void (*regmap_unlock)(struct regmap *map);
struct regmap {
struct mutex mutex;
spinlock_t spinlock;
regmap_lock lock;
regmap_unlock unlock;
void *lock_arg; /* This is passed to lock/unlock functions */
struct device *dev; /* Device we do I/O on */
void *work_buf; /* Scratch buffer used to format I/O */
@ -50,6 +56,12 @@ struct regmap {
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs;
const char *debugfs_name;
unsigned int debugfs_reg_len;
unsigned int debugfs_val_len;
unsigned int debugfs_tot_len;
struct list_head debugfs_off_cache;
#endif
unsigned int max_register;
@ -57,6 +69,10 @@ struct regmap {
bool (*readable_reg)(struct device *dev, unsigned int reg);
bool (*volatile_reg)(struct device *dev, unsigned int reg);
bool (*precious_reg)(struct device *dev, unsigned int reg);
const struct regmap_access_table *wr_table;
const struct regmap_access_table *rd_table;
const struct regmap_access_table *volatile_table;
const struct regmap_access_table *precious_table;
u8 read_flag_mask;
u8 write_flag_mask;
@ -120,6 +136,8 @@ int _regmap_write(struct regmap *map, unsigned int reg,
struct regmap_range_node {
struct rb_node node;
const char *name;
struct regmap *map;
unsigned int range_min;
unsigned int range_max;

148
drivers/base/regmap/regmap-debugfs.c
View file

@ -56,17 +56,74 @@ static const struct file_operations regmap_name_fops = {
.llseek = default_llseek,
};
static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
/*
* Work out where the start offset maps into register numbers, bearing
* in mind that we suppress hidden registers.
*/
static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
unsigned int base,
loff_t from,
loff_t *pos)
{
int reg_len, val_len, tot_len;
size_t buf_pos = 0;
struct regmap_debugfs_off_cache *c = NULL;
loff_t p = 0;
unsigned int i, ret;
/*
* If we don't have a cache build one so we don't have to do a
* linear scan each time.
*/
if (list_empty(&map->debugfs_off_cache)) {
for (i = base; i <= map->max_register; i += map->reg_stride) {
/* Skip unprinted registers, closing off cache entry */
if (!regmap_readable(map, i) ||
regmap_precious(map, i)) {
if (c) {
c->max = p - 1;
list_add_tail(&c->list,
&map->debugfs_off_cache);
c = NULL;
}
continue;
}
/* No cache entry? Start a new one */
if (!c) {
c = kzalloc(sizeof(*c), GFP_KERNEL);
if (!c)
break;
c->min = p;
c->base_reg = i;
}
p += map->debugfs_tot_len;
}
}
/* Find the relevant block */
list_for_each_entry(c, &map->debugfs_off_cache, list) {
if (*pos >= c->min && *pos <= c->max) {
*pos = c->min;
return c->base_reg;
}
ret = c->max;
}
return ret;
}
static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
unsigned int to, char __user *user_buf,
size_t count, loff_t *ppos)
{
size_t buf_pos = 0;
loff_t p = *ppos;
ssize_t ret;
int i;
struct regmap *map = file->private_data;
char *buf;
unsigned int val;
unsigned int val, start_reg;
if (*ppos < 0 || !count)
return -EINVAL;
@ -76,11 +133,18 @@ static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
return -ENOMEM;
/* Calculate the length of a fixed format */
reg_len = regmap_calc_reg_len(map->max_register, buf, count);
val_len = 2 * map->format.val_bytes;
tot_len = reg_len + val_len + 3; /* : \n */
if (!map->debugfs_tot_len) {
map->debugfs_reg_len = regmap_calc_reg_len(map->max_register,
buf, count);
map->debugfs_val_len = 2 * map->format.val_bytes;
map->debugfs_tot_len = map->debugfs_reg_len +
map->debugfs_val_len + 3; /* : \n */
}
for (i = 0; i <= map->max_register; i += map->reg_stride) {
/* Work out which register we're starting at */
start_reg = regmap_debugfs_get_dump_start(map, from, *ppos, &p);
for (i = start_reg; i <= to; i += map->reg_stride) {
if (!regmap_readable(map, i))
continue;
@ -90,26 +154,27 @@ static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
/* If we're in the region the user is trying to read */
if (p >= *ppos) {
/* ...but not beyond it */
if (buf_pos >= count - 1 - tot_len)
if (buf_pos + 1 + map->debugfs_tot_len >= count)
break;
/* Format the register */
snprintf(buf + buf_pos, count - buf_pos, "%.*x: ",
reg_len, i);
buf_pos += reg_len + 2;
map->debugfs_reg_len, i - from);
buf_pos += map->debugfs_reg_len + 2;
/* Format the value, write all X if we can't read */
ret = regmap_read(map, i, &val);
if (ret == 0)
snprintf(buf + buf_pos, count - buf_pos,
"%.*x", val_len, val);
"%.*x", map->debugfs_val_len, val);
else
memset(buf + buf_pos, 'X', val_len);
memset(buf + buf_pos, 'X',
map->debugfs_val_len);
buf_pos += 2 * map->format.val_bytes;
buf[buf_pos++] = '\n';
}
p += tot_len;
p += map->debugfs_tot_len;
}
ret = buf_pos;
@ -126,6 +191,15 @@ static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
return ret;
}
static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct regmap *map = file->private_data;
return regmap_read_debugfs(map, 0, map->max_register, user_buf,
count, ppos);
}
#undef REGMAP_ALLOW_WRITE_DEBUGFS
#ifdef REGMAP_ALLOW_WRITE_DEBUGFS
/*
@ -174,6 +248,22 @@ static const struct file_operations regmap_map_fops = {
.llseek = default_llseek,
};
static ssize_t regmap_range_read_file(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct regmap_range_node *range = file->private_data;
struct regmap *map = range->map;
return regmap_read_debugfs(map, range->range_min, range->range_max,
user_buf, count, ppos);
}
static const struct file_operations regmap_range_fops = {
.open = simple_open,
.read = regmap_range_read_file,
.llseek = default_llseek,
};
static ssize_t regmap_access_read_file(struct file *file,
char __user *user_buf, size_t count,
loff_t *ppos)
@ -244,6 +334,11 @@ static const struct file_operations regmap_access_fops = {
void regmap_debugfs_init(struct regmap *map, const char *name)
{
struct rb_node *next;
struct regmap_range_node *range_node;
INIT_LIST_HEAD(&map->debugfs_off_cache);
if (name) {
map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
dev_name(map->dev), name);
@ -276,11 +371,32 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
debugfs_create_bool("cache_bypass", 0400, map->debugfs,
&map->cache_bypass);
}
next = rb_first(&map->range_tree);
while (next) {
range_node = rb_entry(next, struct regmap_range_node, node);
if (range_node->name)
debugfs_create_file(range_node->name, 0400,
map->debugfs, range_node,
&regmap_range_fops);
next = rb_next(&range_node->node);
}
}
void regmap_debugfs_exit(struct regmap *map)
{
struct regmap_debugfs_off_cache *c;
debugfs_remove_recursive(map->debugfs);
while (!list_empty(&map->debugfs_off_cache)) {
c = list_first_entry(&map->debugfs_off_cache,
struct regmap_debugfs_off_cache,
list);
list_del(&c->list);
kfree(c);
}
kfree(map->debugfs_name);
}

19
drivers/base/regmap/regmap-irq.c
View file

@ -458,3 +458,22 @@ int regmap_irq_get_virq(struct regmap_irq_chip_data *data, int irq)
return irq_create_mapping(data->domain, irq);
}
EXPORT_SYMBOL_GPL(regmap_irq_get_virq);
/**
* regmap_irq_get_domain(): Retrieve the irq_domain for the chip
*
* Useful for drivers to request their own IRQs and for integration
* with subsystems. For ease of integration NULL is accepted as a
* domain, allowing devices to just call this even if no domain is
* allocated.
*
* @data: regmap_irq controller to operate on.
*/
struct irq_domain *regmap_irq_get_domain(struct regmap_irq_chip_data *data)
{
if (data)
return data->domain;
else
return NULL;
}
EXPORT_SYMBOL_GPL(regmap_irq_get_domain);

277
drivers/base/regmap/regmap.c
View file

@ -34,6 +34,36 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change);
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);
static 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);
}
bool regmap_writeable(struct regmap *map, unsigned int reg)
{
if (map->max_register && reg > map->max_register)
@ -42,6 +72,9 @@ bool regmap_writeable(struct regmap *map, unsigned int reg)
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;
}
@ -56,6 +89,9 @@ bool regmap_readable(struct regmap *map, unsigned int reg)
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;
}
@ -67,6 +103,9 @@ bool regmap_volatile(struct regmap *map, unsigned int reg)
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);
return true;
}
@ -78,11 +117,14 @@ bool regmap_precious(struct regmap *map, unsigned int reg)
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;
}
static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
unsigned int num)
size_t num)
{
unsigned int i;
@ -214,23 +256,27 @@ static unsigned int regmap_parse_32_native(void *buf)
return *(u32 *)buf;
}
static void regmap_lock_mutex(struct regmap *map)
static void regmap_lock_mutex(void *__map)
{
struct regmap *map = __map;
mutex_lock(&map->mutex);
}
static void regmap_unlock_mutex(struct regmap *map)
static void regmap_unlock_mutex(void *__map)
{
struct regmap *map = __map;
mutex_unlock(&map->mutex);
}
static void regmap_lock_spinlock(struct regmap *map)
static void regmap_lock_spinlock(void *__map)
{
struct regmap *map = __map;
spin_lock(&map->spinlock);
}
static void regmap_unlock_spinlock(struct regmap *map)
static void regmap_unlock_spinlock(void *__map)
{
struct regmap *map = __map;
spin_unlock(&map->spinlock);
}
@ -335,14 +381,21 @@ struct regmap *regmap_init(struct device *dev,
goto err;
}
if (bus->fast_io) {
spin_lock_init(&map->spinlock);
map->lock = regmap_lock_spinlock;
map->unlock = regmap_unlock_spinlock;
if (config->lock && config->unlock) {
map->lock = config->lock;
map->unlock = config->unlock;
map->lock_arg = config->lock_arg;
} else {
mutex_init(&map->mutex);
map->lock = regmap_lock_mutex;
map->unlock = regmap_unlock_mutex;
if (bus->fast_io) {
spin_lock_init(&map->spinlock);
map->lock = regmap_lock_spinlock;
map->unlock = regmap_unlock_spinlock;
} else {
mutex_init(&map->mutex);
map->lock = regmap_lock_mutex;
map->unlock = regmap_unlock_mutex;
}
map->lock_arg = map;
}
map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
map->format.pad_bytes = config->pad_bits / 8;
@ -359,6 +412,10 @@ struct regmap *regmap_init(struct device *dev,
map->bus = bus;
map->bus_context = bus_context;
map->max_register = config->max_register;
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->writeable_reg = config->writeable_reg;
map->readable_reg = config->readable_reg;
map->volatile_reg = config->volatile_reg;
@ -519,20 +576,38 @@ struct regmap *regmap_init(struct device *dev,
}
map->range_tree = RB_ROOT;
for (i = 0; i < config->n_ranges; i++) {
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 ||
range_cfg->range_max > map->max_register ||
range_cfg->selector_reg > map->max_register ||
range_cfg->window_len == 0)
if (range_cfg->range_max < range_cfg->range_min) {
dev_err(map->dev, "Invalid range %d: %d < %d\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: %d > %d\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->n_ranges; j++) {
for (j = 0; j < config->num_ranges; j++) {
unsigned sel_reg = config->ranges[j].selector_reg;
unsigned win_min = config->ranges[j].window_start;
unsigned win_max = win_min +
@ -540,11 +615,17 @@ struct regmap *regmap_init(struct device *dev,
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;
}
}
@ -555,6 +636,8 @@ struct regmap *regmap_init(struct device *dev,
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;
@ -564,6 +647,7 @@ struct regmap *regmap_init(struct device *dev,
new->window_len = range_cfg->window_len;
if (_regmap_range_add(map, new) == false) {
dev_err(map->dev, "Failed to add range %d\n", i);
kfree(new);
goto err_range;
}
@ -579,7 +663,7 @@ struct regmap *regmap_init(struct device *dev,
}
ret = regcache_init(map, config);
if (ret < 0)
if (ret != 0)
goto err_range;
regmap_debugfs_init(map, config->name);
@ -738,59 +822,57 @@ struct regmap *dev_get_regmap(struct device *dev, const char *name)
EXPORT_SYMBOL_GPL(dev_get_regmap);
static int _regmap_select_page(struct regmap *map, unsigned int *reg,
struct regmap_range_node *range,
unsigned int val_num)
{
struct regmap_range_node *range;
void *orig_work_buf;
unsigned int win_offset;
unsigned int win_page;
bool page_chg;
int ret;
range = _regmap_range_lookup(map, *reg);
if (range) {
win_offset = (*reg - range->range_min) % range->window_len;
win_page = (*reg - range->range_min) / range->window_len;
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;
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);
map->work_buf = orig_work_buf;
if (ret < 0)
return ret;
}
*reg = range->window_start + win_offset;
/* ... 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);
map->work_buf = orig_work_buf;
if (ret != 0)
return ret;
}
*reg = range->window_start + win_offset;
return 0;
}
static int _regmap_raw_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_len)
{
struct regmap_range_node *range;
u8 *u8 = map->work_buf;
void *buf;
int ret = -ENOTSUPP;
@ -814,7 +896,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
ival);
if (ret) {
dev_err(map->dev,
"Error in caching of register: %u ret: %d\n",
"Error in caching of register: %x ret: %d\n",
reg + i, ret);
return ret;
}
@ -825,9 +907,35 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
}
}
ret = _regmap_select_page(map, &reg, val_len / map->format.val_bytes);
if (ret < 0)
return ret;
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(map, reg, val, win_residue *
map->format.val_bytes);
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, &reg, range, val_num);
if (ret != 0)
return ret;
}
map->format.format_reg(map->work_buf, reg, map->reg_shift);
@ -876,6 +984,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
int _regmap_write(struct regmap *map, unsigned int reg,
unsigned int val)
{
struct regmap_range_node *range;
int ret;
BUG_ON(!map->format.format_write && !map->format.format_val);
@ -897,9 +1006,12 @@ int _regmap_write(struct regmap *map, unsigned int reg,
trace_regmap_reg_write(map->dev, reg, val);
if (map->format.format_write) {
ret = _regmap_select_page(map, &reg, 1);
if (ret < 0)
return ret;
range = _regmap_range_lookup(map, reg);
if (range) {
ret = _regmap_select_page(map, &reg, range, 1);
if (ret != 0)
return ret;
}
map->format.format_write(map, reg, val);
@ -939,11 +1051,11 @@ int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
if (reg % map->reg_stride)
return -EINVAL;
map->lock(map);
map->lock(map->lock_arg);
ret = _regmap_write(map, reg, val);
map->unlock(map);
map->unlock(map->lock_arg);
return ret;
}
@ -975,11 +1087,11 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
if (reg % map->reg_stride)
return -EINVAL;
map->lock(map);
map->lock(map->lock_arg);
ret = _regmap_raw_write(map, reg, val, val_len);
map->unlock(map);
map->unlock(map->lock_arg);
return ret;
}
@ -1011,7 +1123,7 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
if (reg % map->reg_stride)
return -EINVAL;
map->lock(map);
map->lock(map->lock_arg);
/* No formatting is require if val_byte is 1 */
if (val_bytes == 1) {
@ -1047,7 +1159,7 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
kfree(wval);
out:
map->unlock(map);
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_bulk_write);
@ -1055,12 +1167,17 @@ EXPORT_SYMBOL_GPL(regmap_bulk_write);
static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
unsigned int val_len)
{
struct regmap_range_node *range;
u8 *u8 = map->work_buf;
int ret;
ret = _regmap_select_page(map, &reg, val_len / map->format.val_bytes);
if (ret < 0)
return ret;
range = _regmap_range_lookup(map, reg);
if (range) {
ret = _regmap_select_page(map, &reg, range,
val_len / map->format.val_bytes);
if (ret != 0)
return ret;
}
map->format.format_reg(map->work_buf, reg, map->reg_shift);
@ -1137,11 +1254,11 @@ int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
if (reg % map->reg_stride)
return -EINVAL;
map->lock(map);
map->lock(map->lock_arg);
ret = _regmap_read(map, reg, val);
map->unlock(map);
map->unlock(map->lock_arg);
return ret;
}
@ -1171,7 +1288,7 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
if (reg % map->reg_stride)
return -EINVAL;
map->lock(map);
map->lock(map->lock_arg);
if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
map->cache_type == REGCACHE_NONE) {
@ -1193,7 +1310,7 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
}
out:
map->unlock(map);
map->unlock(map->lock_arg);
return ret;
}
@ -1300,9 +1417,9 @@ int regmap_update_bits(struct regmap *map, unsigned int reg,
bool change;
int ret;
map->lock(map);
map->lock(map->lock_arg);
ret = _regmap_update_bits(map, reg, mask, val, &change);
map->unlock(map);
map->unlock(map->lock_arg);
return ret;
}
@ -1326,9 +1443,9 @@ int regmap_update_bits_check(struct regmap *map, unsigned int reg,
{
int ret;
map->lock(map);
map->lock(map->lock_arg);
ret = _regmap_update_bits(map, reg, mask, val, change);
map->unlock(map);
map->unlock(map->lock_arg);
return ret;
}
EXPORT_SYMBOL_GPL(regmap_update_bits_check);
@ -1357,7 +1474,7 @@ int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
if (map->patch)
return -EBUSY;
map->lock(map);
map->lock(map->lock_arg);
bypass = map->cache_bypass;
@ -1385,7 +1502,7 @@ int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
out:
map->cache_bypass = bypass;
map->unlock(map);
map->unlock(map->lock_arg);
return ret;
}

95
include/linux/regmap.h
View file

@ -19,6 +19,7 @@
struct module;
struct device;
struct i2c_client;
struct irq_domain;
struct spi_device;
struct regmap;
struct regmap_range_cfg;
@ -53,6 +54,39 @@ enum regmap_endian {
REGMAP_ENDIAN_NATIVE,
};
/**
* A register range, used for access related checks
* (readable/writeable/volatile/precious checks)
*
* @range_min: address of first register
* @range_max: address of last register
*/
struct regmap_range {
unsigned int range_min;
unsigned int range_max;
};
/*
* A table of ranges including some yes ranges and some no ranges.
* If a register belongs to a no_range, the corresponding check function
* will return false. If a register belongs to a yes range, the corresponding
* check function will return true. "no_ranges" are searched first.
*
* @yes_ranges : pointer to an array of regmap ranges used as "yes ranges"
* @n_yes_ranges: size of the above array
* @no_ranges: pointer to an array of regmap ranges used as "no ranges"
* @n_no_ranges: size of the above array
*/
struct regmap_access_table {
const struct regmap_range *yes_ranges;
unsigned int n_yes_ranges;
const struct regmap_range *no_ranges;
unsigned int n_no_ranges;
};
typedef void (*regmap_lock)(void *);
typedef void (*regmap_unlock)(void *);
/**
* Configuration for the register map of a device.
*
@ -67,16 +101,39 @@ enum regmap_endian {
* @val_bits: Number of bits in a register value, mandatory.
*
* @writeable_reg: Optional callback returning true if the register
* can be written to.
* can be written to. If this field is NULL but wr_table
* (see below) is not, the check is performed on such table
* (a register is writeable if it belongs to one of the ranges
* specified by wr_table).
* @readable_reg: Optional callback returning true if the register
* can be read from.
* can be read from. If this field is NULL but rd_table
* (see below) is not, the check is performed on such table
* (a register is readable if it belongs to one of the ranges
* specified by rd_table).
* @volatile_reg: Optional callback returning true if the register
* value can't be cached.
* value can't be cached. If this field is NULL but
* volatile_table (see below) is not, the check is performed on
* such table (a register is volatile if it belongs to one of
* the ranges specified by volatile_table).
* @precious_reg: Optional callback returning true if the rgister
* should not be read outside of a call from the driver
* (eg, a clear on read interrupt status register).
* should not be read outside of a call from the driver
* (eg, a clear on read interrupt status register). If this
* field is NULL but precious_table (see below) is not, the
* check is performed on such table (a register is precious if
* it belongs to one of the ranges specified by precious_table).
* @lock: Optional lock callback (overrides regmap's default lock
* function, based on spinlock or mutex).
* @unlock: As above for unlocking.
* @lock_arg: this field is passed as the only argument of lock/unlock
* functions (ignored in case regular lock/unlock functions
* are not overridden).
*
* @max_register: Optional, specifies the maximum valid register index.
* @wr_table: Optional, points to a struct regmap_access_table specifying
* valid ranges for write access.
* @rd_table: As above, for read access.
* @volatile_table: As above, for volatile registers.
* @precious_table: As above, for precious registers.
* @reg_defaults: Power on reset values for registers (for use with
* register cache support).
* @num_reg_defaults: Number of elements in reg_defaults.
@ -116,8 +173,15 @@ struct regmap_config {
bool (*readable_reg)(struct device *dev, unsigned int reg);
bool (*volatile_reg)(struct device *dev, unsigned int reg);
bool (*precious_reg)(struct device *dev, unsigned int reg);
regmap_lock lock;
regmap_unlock unlock;
void *lock_arg;
unsigned int max_register;
const struct regmap_access_table *wr_table;
const struct regmap_access_table *rd_table;
const struct regmap_access_table *volatile_table;
const struct regmap_access_table *precious_table;
const struct reg_default *reg_defaults;
unsigned int num_reg_defaults;
enum regcache_type cache_type;
@ -133,7 +197,7 @@ struct regmap_config {
enum regmap_endian val_format_endian;
const struct regmap_range_cfg *ranges;
unsigned int n_ranges;
unsigned int num_ranges;
};
/**
@ -142,6 +206,8 @@ struct regmap_config {
* 1. page selector register update;
* 2. access through data window registers.
*
* @name: Descriptive name for diagnostics
*
* @range_min: Address of the lowest register address in virtual range.
* @range_max: Address of the highest register in virtual range.
*
@ -153,6 +219,8 @@ struct regmap_config {
* @window_len: Number of registers in data window.
*/
struct regmap_range_cfg {
const char *name;
/* Registers of virtual address range */
unsigned int range_min;
unsigned int range_max;
@ -181,7 +249,9 @@ typedef void (*regmap_hw_free_context)(void *context);
* Description of a hardware bus for the register map infrastructure.
*
* @fast_io: Register IO is fast. Use a spinlock instead of a mutex
* to perform locking.
* to perform locking. This field is ignored if custom lock/unlock
* functions are used (see fields lock/unlock of
* struct regmap_config).
* @write: Write operation.
* @gather_write: Write operation with split register/value, return -ENOTSUPP
* if not implemented on a given device.
@ -262,6 +332,16 @@ void regcache_mark_dirty(struct regmap *map);
int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
int num_regs);
static inline bool regmap_reg_in_range(unsigned int reg,
const struct regmap_range *range)
{
return reg >= range->range_min && reg <= range->range_max;
}
bool regmap_reg_in_ranges(unsigned int reg,
const struct regmap_range *ranges,
unsigned int nranges);
/**
* Description of an IRQ for the generic regmap irq_chip.
*
@ -317,6 +397,7 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
void regmap_del_irq_chip(int irq, struct regmap_irq_chip_data *data);
int regmap_irq_chip_get_base(struct regmap_irq_chip_data *data);
int regmap_irq_get_virq(struct regmap_irq_chip_data *data, int irq);
struct irq_domain *regmap_irq_get_domain(struct regmap_irq_chip_data *data);
#else