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-rw-r--r--drivers/base/regmap/internal.h15
-rw-r--r--drivers/base/regmap/regmap.c182
-rw-r--r--include/linux/regmap.h28
3 files changed, 215 insertions, 10 deletions
diff --git a/drivers/base/regmap/internal.h b/drivers/base/regmap/internal.h
index 51f05740564..20251864177 100644
--- a/drivers/base/regmap/internal.h
+++ b/drivers/base/regmap/internal.h
@@ -16,6 +16,7 @@
#include <linux/regmap.h>
#include <linux/fs.h>
#include <linux/list.h>
+#include <linux/wait.h>
struct regmap;
struct regcache_ops;
@@ -39,6 +40,13 @@ struct regmap_format {
unsigned int (*parse_val)(void *buf);
};
+struct regmap_async {
+ struct list_head list;
+ struct work_struct cleanup;
+ struct regmap *map;
+ void *work_buf;
+};
+
struct regmap {
struct mutex mutex;
spinlock_t spinlock;
@@ -53,6 +61,11 @@ struct regmap {
void *bus_context;
const char *name;
+ spinlock_t async_lock;
+ wait_queue_head_t async_waitq;
+ struct list_head async_list;
+ int async_ret;
+
#ifdef CONFIG_DEBUG_FS
struct dentry *debugfs;
const char *debugfs_name;
@@ -178,6 +191,8 @@ bool regcache_set_val(void *base, unsigned int idx,
unsigned int val, unsigned int word_size);
int regcache_lookup_reg(struct regmap *map, unsigned int reg);
+void regmap_async_complete_cb(struct regmap_async *async, int ret);
+
extern struct regcache_ops regcache_rbtree_ops;
extern struct regcache_ops regcache_lzo_ops;
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 6845a077bd8..e57b7bc035f 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -41,6 +41,15 @@ static int _regmap_bus_formatted_write(void *context, unsigned int reg,
static int _regmap_bus_raw_write(void *context, unsigned int reg,
unsigned int val);
+static void async_cleanup(struct work_struct *work)
+{
+ struct regmap_async *async = container_of(work, struct regmap_async,
+ cleanup);
+
+ kfree(async->work_buf);
+ kfree(async);
+}
+
bool regmap_reg_in_ranges(unsigned int reg,
const struct regmap_range *ranges,
unsigned int nranges)
@@ -430,6 +439,10 @@ struct regmap *regmap_init(struct device *dev,
map->cache_type = config->cache_type;
map->name = config->name;
+ spin_lock_init(&map->async_lock);
+ INIT_LIST_HEAD(&map->async_list);
+ init_waitqueue_head(&map->async_waitq);
+
if (config->read_flag_mask || config->write_flag_mask) {
map->read_flag_mask = config->read_flag_mask;
map->write_flag_mask = config->write_flag_mask;
@@ -884,10 +897,13 @@ static int _regmap_select_page(struct regmap *map, unsigned int *reg,
}
static int _regmap_raw_write(struct regmap *map, unsigned int reg,
- const void *val, size_t val_len)
+ const void *val, size_t val_len, bool async)
{
struct regmap_range_node *range;
+ unsigned long flags;
u8 *u8 = map->work_buf;
+ void *work_val = map->work_buf + map->format.reg_bytes +
+ map->format.pad_bytes;
void *buf;
int ret = -ENOTSUPP;
size_t len;
@@ -932,7 +948,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
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);
+ map->format.val_bytes, async);
if (ret != 0)
return ret;
@@ -955,6 +971,50 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
u8[0] |= map->write_flag_mask;
+ if (async && map->bus->async_write) {
+ struct regmap_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;
+ }
+
+ INIT_WORK(&async->cleanup, async_cleanup);
+ 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);
+ if (val == work_val)
+ val = async->work_buf + map->format.pad_bytes +
+ map->format.reg_bytes;
+
+ spin_lock_irqsave(&map->async_lock, flags);
+ list_add_tail(&async->list, &map->async_list);
+ spin_unlock_irqrestore(&map->async_lock, flags);
+
+ ret = map->bus->async_write(map->bus_context, async->work_buf,
+ map->format.reg_bytes +
+ map->format.pad_bytes,
+ val, val_len, async);
+
+ if (ret != 0) {
+ dev_err(map->dev, "Failed to schedule write: %d\n",
+ ret);
+
+ spin_lock_irqsave(&map->async_lock, flags);
+ list_del(&async->list);
+ spin_unlock_irqrestore(&map->async_lock, flags);
+
+ kfree(async->work_buf);
+ kfree(async);
+ }
+ }
+
trace_regmap_hw_write_start(map->dev, reg,
val_len / map->format.val_bytes);
@@ -962,8 +1022,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
* send the work_buf directly, otherwise try to do a gather
* write.
*/
- if (val == (map->work_buf + map->format.pad_bytes +
- map->format.reg_bytes))
+ if (val == work_val)
ret = map->bus->write(map->bus_context, map->work_buf,
map->format.reg_bytes +
map->format.pad_bytes +
@@ -1036,7 +1095,7 @@ static int _regmap_bus_raw_write(void *context, unsigned int reg,
map->work_buf +
map->format.reg_bytes +
map->format.pad_bytes,
- map->format.val_bytes);
+ map->format.val_bytes, false);
}
int _regmap_write(struct regmap *map, unsigned int reg,
@@ -1119,7 +1178,7 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
map->lock(map->lock_arg);
- ret = _regmap_raw_write(map, reg, val, val_len);
+ ret = _regmap_raw_write(map, reg, val, val_len, false);
map->unlock(map->lock_arg);
@@ -1175,14 +1234,15 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
if (map->use_single_rw) {
for (i = 0; i < val_count; i++) {
ret = regmap_raw_write(map,
- reg + (i * map->reg_stride),
- val + (i * val_bytes),
- val_bytes);
+ reg + (i * map->reg_stride),
+ val + (i * val_bytes),
+ val_bytes);
if (ret != 0)
return ret;
}
} else {
- ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
+ ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count,
+ false);
}
if (val_bytes != 1)
@@ -1194,6 +1254,48 @@ out:
}
EXPORT_SYMBOL_GPL(regmap_bulk_write);
+/**
+ * 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 (reg % map->reg_stride)
+ return -EINVAL;
+
+ map->lock(map->lock_arg);
+
+ ret = _regmap_raw_write(map, reg, val, val_len, true);
+
+ 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)
{
@@ -1492,6 +1594,66 @@ int regmap_update_bits_check(struct regmap *map, unsigned int reg,
}
EXPORT_SYMBOL_GPL(regmap_update_bits_check);
+void regmap_async_complete_cb(struct regmap_async *async, int ret)
+{
+ struct regmap *map = async->map;
+ bool wake;
+
+ spin_lock(&map->async_lock);
+
+ list_del(&async->list);
+ wake = list_empty(&map->async_list);
+
+ if (ret != 0)
+ map->async_ret = ret;
+
+ spin_unlock(&map->async_lock);
+
+ schedule_work(&async->cleanup);
+
+ if (wake)
+ wake_up(&map->async_waitq);
+}
+
+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->async_write)
+ return 0;
+
+ 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);
+
+ return ret;
+}
+
/**
* regmap_register_patch: Register and apply register updates to be applied
* on device initialistion
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index b7e95bf942c..f9b7fbe35ab 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -235,14 +235,21 @@ struct regmap_range_cfg {
unsigned int window_len;
};
+struct regmap_async;
+
typedef int (*regmap_hw_write)(void *context, const void *data,
size_t count);
typedef int (*regmap_hw_gather_write)(void *context,
const void *reg, size_t reg_len,
const void *val, size_t val_len);
+typedef int (*regmap_hw_async_write)(void *context,
+ const void *reg, size_t reg_len,
+ const void *val, size_t val_len,
+ struct regmap_async *async);
typedef int (*regmap_hw_read)(void *context,
const void *reg_buf, size_t reg_size,
void *val_buf, size_t val_size);
+typedef struct regmap_async *(*regmap_hw_async_alloc)(void);
typedef void (*regmap_hw_free_context)(void *context);
/**
@@ -255,8 +262,11 @@ typedef void (*regmap_hw_free_context)(void *context);
* @write: Write operation.
* @gather_write: Write operation with split register/value, return -ENOTSUPP
* if not implemented on a given device.
+ * @async_write: Write operation which completes asynchronously, optional and
+ * must serialise with respect to non-async I/O.
* @read: Read operation. Data is returned in the buffer used to transmit
* data.
+ * @async_alloc: Allocate a regmap_async() structure.
* @read_flag_mask: Mask to be set in the top byte of the register when doing
* a read.
* @reg_format_endian_default: Default endianness for formatted register
@@ -265,13 +275,16 @@ typedef void (*regmap_hw_free_context)(void *context);
* @val_format_endian_default: Default endianness for formatted register
* values. Used when the regmap_config specifies DEFAULT. If this is
* DEFAULT, BIG is assumed.
+ * @async_size: Size of struct used for async work.
*/
struct regmap_bus {
bool fast_io;
regmap_hw_write write;
regmap_hw_gather_write gather_write;
+ regmap_hw_async_write async_write;
regmap_hw_read read;
regmap_hw_free_context free_context;
+ regmap_hw_async_alloc async_alloc;
u8 read_flag_mask;
enum regmap_endian reg_format_endian_default;
enum regmap_endian val_format_endian_default;
@@ -310,6 +323,8 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_len);
int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
size_t val_count);
+int regmap_raw_write_async(struct regmap *map, unsigned int reg,
+ const void *val, size_t val_len);
int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val);
int regmap_raw_read(struct regmap *map, unsigned int reg,
void *val, size_t val_len);
@@ -321,6 +336,7 @@ int regmap_update_bits_check(struct regmap *map, unsigned int reg,
unsigned int mask, unsigned int val,
bool *change);
int regmap_get_val_bytes(struct regmap *map);
+int regmap_async_complete(struct regmap *map);
int regcache_sync(struct regmap *map);
int regcache_sync_region(struct regmap *map, unsigned int min,
@@ -422,6 +438,13 @@ static inline int regmap_raw_write(struct regmap *map, unsigned int reg,
return -EINVAL;
}
+static inline int regmap_raw_write_async(struct regmap *map, unsigned int reg,
+ const void *val, size_t val_len)
+{
+ WARN_ONCE(1, "regmap API is disabled");
+ return -EINVAL;
+}
+
static inline int regmap_bulk_write(struct regmap *map, unsigned int reg,
const void *val, size_t val_count)
{
@@ -500,6 +523,11 @@ static inline void regcache_mark_dirty(struct regmap *map)
WARN_ONCE(1, "regmap API is disabled");
}
+static inline void regmap_async_complete(struct regmap *map)
+{
+ WARN_ONCE(1, "regmap API is disabled");
+}
+
static inline int regmap_register_patch(struct regmap *map,
const struct reg_default *regs,
int num_regs)
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-12 00:01:06 +0000