1 files changed, 260 insertions, 34 deletions

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 7d689a15c500..ccdac61ac5e2 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -42,15 +42,6 @@ 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)
@@ -465,6 +456,7 @@ struct regmap *regmap_init(struct device *dev,
 
         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) {
@@ -821,6 +813,8 @@ static void regmap_field_init(struct regmap_field *rm_field,
         rm_field->reg = reg_field.reg;
         rm_field->shift = reg_field.lsb;
         rm_field->mask = ((BIT(field_bits) - 1) << reg_field.lsb);
+        rm_field->id_size = reg_field.id_size;
+        rm_field->id_offset = reg_field.id_offset;
 }
 
 /**
@@ -942,12 +936,22 @@ EXPORT_SYMBOL_GPL(regmap_reinit_cache);
  */
 void regmap_exit(struct regmap *map)
 {
+        struct regmap_async *async;
+
         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);
+        }
         kfree(map);
 }
 EXPORT_SYMBOL_GPL(regmap_exit);
@@ -1039,7 +1043,7 @@ static int _regmap_select_page(struct regmap *map, unsigned int *reg,
 }
 
 int _regmap_raw_write(struct regmap *map, unsigned int reg,
-                      const void *val, size_t val_len, bool async)
+                      const void *val, size_t val_len)
 {
         struct regmap_range_node *range;
         unsigned long flags;
@@ -1091,7 +1095,7 @@ 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, async);
+                                                map->format.val_bytes);
                         if (ret != 0)
                                 return ret;
 
@@ -1114,21 +1118,42 @@ 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;
+        /*
+         * 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->async_write) {
+                struct regmap_async *async;
 
                 trace_regmap_async_write_start(map->dev, reg, val_len);
 
-                async->work_buf = kzalloc(map->format.buf_size,
-                                          GFP_KERNEL | GFP_DMA);
-                if (!async->work_buf) {
-                        kfree(async);
-                        return -ENOMEM;
+                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;
+                        }
                 }
 
-                INIT_WORK(&async->cleanup, async_cleanup);
                 async->map = map;
 
                 /* If the caller supplied the value we can use it safely. */
@@ -1152,11 +1177,8 @@ int _regmap_raw_write(struct regmap *map, unsigned int reg,
                                 ret);
 
                         spin_lock_irqsave(&map->async_lock, flags);
-                        list_del(&async->list);
+                        list_move(&async->list, &map->async_free);
                         spin_unlock_irqrestore(&map->async_lock, flags);
-
-                        kfree(async->work_buf);
-                        kfree(async);
                 }
 
                 return ret;
@@ -1253,7 +1275,7 @@ 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, false);
+                                 map->format.val_bytes);
 }
 
 static inline void *_regmap_map_get_context(struct regmap *map)
@@ -1318,6 +1340,37 @@ int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
 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 (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);
+
+/**
  * regmap_raw_write(): Write raw values to one or more registers
  *
  * @map: Register map to write to
@@ -1345,7 +1398,7 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
 
         map->lock(map->lock_arg);
 
-        ret = _regmap_raw_write(map, reg, val, val_len, false);
+        ret = _regmap_raw_write(map, reg, val, val_len);
 
         map->unlock(map->lock_arg);
 
@@ -1369,6 +1422,74 @@ int regmap_field_write(struct regmap_field *field, unsigned int val)
 }
 EXPORT_SYMBOL_GPL(regmap_field_write);
 
+/**
+ * regmap_field_update_bits():  Perform a read/modify/write cycle
+ *                              on the register field
+ *
+ * @field: Register field to write to
+ * @mask: Bitmask to change
+ * @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_field_update_bits(struct regmap_field *field, unsigned int mask, unsigned int val)
+{
+        mask = (mask << field->shift) & field->mask;
+
+        return regmap_update_bits(field->regmap, field->reg,
+                                  mask, val << field->shift);
+}
+EXPORT_SYMBOL_GPL(regmap_field_update_bits);
+
+/**
+ * regmap_fields_write(): Write a value to a single register field with port ID
+ *
+ * @field: Register field to write to
+ * @id: port ID
+ * @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_fields_write(struct regmap_field *field, unsigned int id,
+                        unsigned int val)
+{
+        if (id >= field->id_size)
+                return -EINVAL;
+
+        return regmap_update_bits(field->regmap,
+                                  field->reg + (field->id_offset * id),
+                                  field->mask, val << field->shift);
+}
+EXPORT_SYMBOL_GPL(regmap_fields_write);
+
+/**
+ * regmap_fields_update_bits(): Perform a read/modify/write cycle
+ *                              on the register field
+ *
+ * @field: Register field to write to
+ * @id: port ID
+ * @mask: Bitmask to change
+ * @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_fields_update_bits(struct regmap_field *field,  unsigned int id,
+                              unsigned int mask, unsigned int val)
+{
+        if (id >= field->id_size)
+                return -EINVAL;
+
+        mask = (mask << field->shift) & field->mask;
+
+        return regmap_update_bits(field->regmap,
+                                  field->reg + (field->id_offset * id),
+                                  mask, val << field->shift);
+}
+EXPORT_SYMBOL_GPL(regmap_fields_update_bits);
+
 /*
  * regmap_bulk_write(): Write multiple registers to the device
  *
@@ -1426,8 +1547,7 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
                                 return ret;
                 }
         } else {
-                ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count,
-                                        false);
+                ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
         }
 
         if (val_bytes != 1)
@@ -1473,7 +1593,11 @@ int regmap_raw_write_async(struct regmap *map, unsigned int reg,
 
         map->lock(map->lock_arg);
 
-        ret = _regmap_raw_write(map, reg, val, val_len, true);
+        map->async = true;
+
+        ret = _regmap_raw_write(map, reg, val, val_len);
+
+        map->async = false;
 
         map->unlock(map->lock_arg);
 
@@ -1677,6 +1801,39 @@ int regmap_field_read(struct regmap_field *field, unsigned int *val)
 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),
+                          &reg_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);
+
+/**
  * regmap_bulk_read(): Read multiple registers from the device
  *
  * @map: Register map to write to
@@ -1788,6 +1945,41 @@ int regmap_update_bits(struct regmap *map, unsigned int reg,
 EXPORT_SYMBOL_GPL(regmap_update_bits);
 
 /**
+ * regmap_update_bits_async: Perform a read/modify/write cycle on the register
+ *                           map asynchronously
+ *
+ * @map: Register map to update
+ * @reg: Register to update
+ * @mask: Bitmask to change
+ * @val: New value for bitmask
+ *
+ * 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_async(struct regmap *map, unsigned int reg,
+                             unsigned int mask, unsigned int val)
+{
+        bool change;
+        int ret;
+
+        map->lock(map->lock_arg);
+
+        map->async = true;
+
+        ret = _regmap_update_bits(map, reg, mask, val, &change);
+
+        map->async = false;
+
+        map->unlock(map->lock_arg);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_update_bits_async);
+
+/**
  * regmap_update_bits_check: Perform a read/modify/write cycle on the
  *                           register map and report if updated
  *
@@ -1812,6 +2004,43 @@ int regmap_update_bits_check(struct regmap *map, unsigned int reg,
 }
 EXPORT_SYMBOL_GPL(regmap_update_bits_check);
 
+/**
+ * regmap_update_bits_check_async: Perform a read/modify/write cycle on the
+ *                                 register map asynchronously and report if
+ *                                 updated
+ *
+ * @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
+ *
+ * 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_check_async(struct regmap *map, unsigned int reg,
+                                   unsigned int mask, unsigned int val,
+                                   bool *change)
+{
+        int ret;
+
+        map->lock(map->lock_arg);
+
+        map->async = true;
+
+        ret = _regmap_update_bits(map, reg, mask, val, change);
+
+        map->async = false;
+
+        map->unlock(map->lock_arg);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(regmap_update_bits_check_async);
+
 void regmap_async_complete_cb(struct regmap_async *async, int ret)
 {
         struct regmap *map = async->map;
@@ -1820,8 +2049,7 @@ void regmap_async_complete_cb(struct regmap_async *async, int ret)
         trace_regmap_async_io_complete(map->dev);
 
         spin_lock(&map->async_lock);
-
-        list_del(&async->list);
+        list_move(&async->list, &map->async_free);
         wake = list_empty(&map->async_list);
 
         if (ret != 0)
@@ -1829,8 +2057,6 @@ void regmap_async_complete_cb(struct regmap_async *async, int ret)
 
         spin_unlock(&map->async_lock);
 
-        schedule_work(&async->cleanup);
-
         if (wake)
                 wake_up(&map->async_waitq);
 }