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path: root/drivers/base/regmap
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Diffstat (limited to 'drivers/base/regmap')
-rw-r--r--drivers/base/regmap/regmap-debugfs.c99
-rw-r--r--drivers/base/regmap/regmap.c51
2 files changed, 134 insertions, 16 deletions
diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index 5799a0b9e6cc..f42f2bac6466 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -469,6 +469,87 @@ static const struct file_operations regmap_access_fops = {
.llseek = default_llseek,
};
+static ssize_t regmap_cache_only_write_file(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct regmap *map = container_of(file->private_data,
+ struct regmap, cache_only);
+ ssize_t result;
+ bool was_enabled, require_sync = false;
+ int err;
+
+ map->lock(map->lock_arg);
+
+ was_enabled = map->cache_only;
+
+ result = debugfs_write_file_bool(file, user_buf, count, ppos);
+ if (result < 0) {
+ map->unlock(map->lock_arg);
+ return result;
+ }
+
+ if (map->cache_only && !was_enabled) {
+ dev_warn(map->dev, "debugfs cache_only=Y forced\n");
+ add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+ } else if (!map->cache_only && was_enabled) {
+ dev_warn(map->dev, "debugfs cache_only=N forced: syncing cache\n");
+ require_sync = true;
+ }
+
+ map->unlock(map->lock_arg);
+
+ if (require_sync) {
+ err = regcache_sync(map);
+ if (err)
+ dev_err(map->dev, "Failed to sync cache %d\n", err);
+ }
+
+ return result;
+}
+
+static const struct file_operations regmap_cache_only_fops = {
+ .open = simple_open,
+ .read = debugfs_read_file_bool,
+ .write = regmap_cache_only_write_file,
+};
+
+static ssize_t regmap_cache_bypass_write_file(struct file *file,
+ const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct regmap *map = container_of(file->private_data,
+ struct regmap, cache_bypass);
+ ssize_t result;
+ bool was_enabled;
+
+ map->lock(map->lock_arg);
+
+ was_enabled = map->cache_bypass;
+
+ result = debugfs_write_file_bool(file, user_buf, count, ppos);
+ if (result < 0)
+ goto out;
+
+ if (map->cache_bypass && !was_enabled) {
+ dev_warn(map->dev, "debugfs cache_bypass=Y forced\n");
+ add_taint(TAINT_USER, LOCKDEP_STILL_OK);
+ } else if (!map->cache_bypass && was_enabled) {
+ dev_warn(map->dev, "debugfs cache_bypass=N forced\n");
+ }
+
+out:
+ map->unlock(map->lock_arg);
+
+ return result;
+}
+
+static const struct file_operations regmap_cache_bypass_fops = {
+ .open = simple_open,
+ .read = debugfs_read_file_bool,
+ .write = regmap_cache_bypass_write_file,
+};
+
void regmap_debugfs_init(struct regmap *map, const char *name)
{
struct rb_node *next;
@@ -518,10 +599,11 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
if (map->max_register || regmap_readable(map, 0)) {
umode_t registers_mode;
- if (IS_ENABLED(REGMAP_ALLOW_WRITE_DEBUGFS))
- registers_mode = 0600;
- else
- registers_mode = 0400;
+#if defined(REGMAP_ALLOW_WRITE_DEBUGFS)
+ registers_mode = 0600;
+#else
+ registers_mode = 0400;
+#endif
debugfs_create_file("registers", registers_mode, map->debugfs,
map, &regmap_map_fops);
@@ -530,12 +612,13 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
}
if (map->cache_type) {
- debugfs_create_bool("cache_only", 0400, map->debugfs,
- &map->cache_only);
+ debugfs_create_file("cache_only", 0600, map->debugfs,
+ &map->cache_only, &regmap_cache_only_fops);
debugfs_create_bool("cache_dirty", 0400, map->debugfs,
&map->cache_dirty);
- debugfs_create_bool("cache_bypass", 0400, map->debugfs,
- &map->cache_bypass);
+ debugfs_create_file("cache_bypass", 0600, map->debugfs,
+ &map->cache_bypass,
+ &regmap_cache_bypass_fops);
}
next = rb_first(&map->range_tree);
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 93d2e23c0719..4dd571f9d4c2 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -34,7 +34,7 @@
static int _regmap_update_bits(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
- bool *change);
+ bool *change, bool force_write);
static int _regmap_bus_reg_read(void *context, unsigned int reg,
unsigned int *val);
@@ -1186,7 +1186,7 @@ static int _regmap_select_page(struct regmap *map, unsigned int *reg,
ret = _regmap_update_bits(map, range->selector_reg,
range->selector_mask,
win_page << range->selector_shift,
- &page_chg);
+ &page_chg, false);
map->work_buf = orig_work_buf;
@@ -1657,6 +1657,18 @@ int regmap_fields_write(struct regmap_field *field, unsigned int id,
}
EXPORT_SYMBOL_GPL(regmap_fields_write);
+int regmap_fields_force_write(struct regmap_field *field, unsigned int id,
+ unsigned int val)
+{
+ if (id >= field->id_size)
+ return -EINVAL;
+
+ return regmap_write_bits(field->regmap,
+ field->reg + (field->id_offset * id),
+ field->mask, val << field->shift);
+}
+EXPORT_SYMBOL_GPL(regmap_fields_force_write);
+
/**
* regmap_fields_update_bits(): Perform a read/modify/write cycle
* on the register field
@@ -2466,7 +2478,7 @@ EXPORT_SYMBOL_GPL(regmap_bulk_read);
static int _regmap_update_bits(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
- bool *change)
+ bool *change, bool force_write)
{
int ret;
unsigned int tmp, orig;
@@ -2478,7 +2490,7 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg,
tmp = orig & ~mask;
tmp |= val & mask;
- if (tmp != orig) {
+ if (force_write || (tmp != orig)) {
ret = _regmap_write(map, reg, tmp);
if (change)
*change = true;
@@ -2506,7 +2518,7 @@ int regmap_update_bits(struct regmap *map, unsigned int reg,
int ret;
map->lock(map->lock_arg);
- ret = _regmap_update_bits(map, reg, mask, val, NULL);
+ ret = _regmap_update_bits(map, reg, mask, val, NULL, false);
map->unlock(map->lock_arg);
return ret;
@@ -2514,6 +2526,29 @@ int regmap_update_bits(struct regmap *map, unsigned int reg,
EXPORT_SYMBOL_GPL(regmap_update_bits);
/**
+ * regmap_write_bits: Perform a read/modify/write cycle on the register map
+ *
+ * @map: Register map to update
+ * @reg: Register to update
+ * @mask: Bitmask to change
+ * @val: New value for bitmask
+ *
+ * Returns zero for success, a negative number on error.
+ */
+int regmap_write_bits(struct regmap *map, unsigned int reg,
+ unsigned int mask, unsigned int val)
+{
+ int ret;
+
+ map->lock(map->lock_arg);
+ ret = _regmap_update_bits(map, reg, mask, val, NULL, true);
+ map->unlock(map->lock_arg);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_write_bits);
+
+/**
* regmap_update_bits_async: Perform a read/modify/write cycle on the register
* map asynchronously
*
@@ -2537,7 +2572,7 @@ int regmap_update_bits_async(struct regmap *map, unsigned int reg,
map->async = true;
- ret = _regmap_update_bits(map, reg, mask, val, NULL);
+ ret = _regmap_update_bits(map, reg, mask, val, NULL, false);
map->async = false;
@@ -2566,7 +2601,7 @@ int regmap_update_bits_check(struct regmap *map, unsigned int reg,
int ret;
map->lock(map->lock_arg);
- ret = _regmap_update_bits(map, reg, mask, val, change);
+ ret = _regmap_update_bits(map, reg, mask, val, change, false);
map->unlock(map->lock_arg);
return ret;
}
@@ -2599,7 +2634,7 @@ int regmap_update_bits_check_async(struct regmap *map, unsigned int reg,
map->async = true;
- ret = _regmap_update_bits(map, reg, mask, val, change);
+ ret = _regmap_update_bits(map, reg, mask, val, change, false);
map->async = false;
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-23 17:14:20 +0000