---

yaml
---
r: 350359
b: refs/heads/master
c: 0d509f2
h: refs/heads/master
i:
  350357: b5ca3a2
  350355: 738749e
  350351: f354137
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 07c320dc31d757b8cb59c64dab320215c929bf02
+refs/heads/master: 0d509f2b112b21411712f0bf789b372987967e49

trunk/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;
 

trunk/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;
 
@@ -955,15 +971,58 @@ 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);
 
 	/* 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 == (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 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
 }
 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