Merge branches 'regmap-core', 'regmap-mmio' and 'regmap-naming' into regmap-stride

drivers/base/regmap/Kconfig

@@ -14,5 +14,8 @@ config REGMAP_I2C
 config REGMAP_SPI
 	tristate
 
+config REGMAP_MMIO
+	tristate
+
 config REGMAP_IRQ
 	bool

drivers/base/regmap/Makefile

@@ -3,4 +3,5 @@ obj-$(CONFIG_REGMAP) += regcache-rbtree.o regcache-lzo.o
 obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o
 obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
 obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
+obj-$(CONFIG_REGMAP_MMIO) += regmap-mmio.o
 obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o

drivers/base/regmap/internal.h

@@ -26,21 +26,29 @@ struct regmap_format {
 	size_t val_bytes;
 	void (*format_write)(struct regmap *map,
 			     unsigned int reg, unsigned int val);
-	void (*format_reg)(void *buf, unsigned int reg);
-	void (*format_val)(void *buf, unsigned int val);
+	void (*format_reg)(void *buf, unsigned int reg, unsigned int shift);
+	void (*format_val)(void *buf, unsigned int val, unsigned int shift);
 	unsigned int (*parse_val)(void *buf);
 };
 
+typedef void (*regmap_lock)(struct regmap *map);
+typedef void (*regmap_unlock)(struct regmap *map);
+
 struct regmap {
-	struct mutex lock;
+	struct mutex mutex;
+	spinlock_t spinlock;
+	regmap_lock lock;
+	regmap_unlock unlock;
 
 	struct device *dev; /* Device we do I/O on */
 	void *work_buf;     /* Scratch buffer used to format I/O */
 	struct regmap_format format;  /* Buffer format */
 	const struct regmap_bus *bus;
+	void *bus_context;
 
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *debugfs;
+	const char *debugfs_name;
 #endif
 
 	unsigned int max_register;
@@ -52,6 +60,9 @@ struct regmap {
 	u8 read_flag_mask;
 	u8 write_flag_mask;
 
+	/* number of bits to (left) shift the reg value when formatting*/
+	int reg_shift;
+
 	/* regcache specific members */
 	const struct regcache_ops *cache_ops;
 	enum regcache_type cache_type;
@@ -101,11 +112,11 @@ int _regmap_write(struct regmap *map, unsigned int reg,
 
 #ifdef CONFIG_DEBUG_FS
 extern void regmap_debugfs_initcall(void);
-extern void regmap_debugfs_init(struct regmap *map);
+extern void regmap_debugfs_init(struct regmap *map, const char *name);
 extern void regmap_debugfs_exit(struct regmap *map);
 #else
 static inline void regmap_debugfs_initcall(void) { }
-static inline void regmap_debugfs_init(struct regmap *map) { }
+static inline void regmap_debugfs_init(struct regmap *map, const char *name) { }
 static inline void regmap_debugfs_exit(struct regmap *map) { }
 #endif
 

drivers/base/regmap/regcache-rbtree.c

@@ -140,7 +140,7 @@ static int rbtree_show(struct seq_file *s, void *ignored)
 	int registers = 0;
 	int average;
 
-	mutex_lock(&map->lock);
+	map->lock(map);
 
 	for (node = rb_first(&rbtree_ctx->root); node != NULL;
 	     node = rb_next(node)) {
@@ -161,7 +161,7 @@ static int rbtree_show(struct seq_file *s, void *ignored)
 	seq_printf(s, "%d nodes, %d registers, average %d registers\n",
 		   nodes, registers, average);
 
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 
 	return 0;
 }

drivers/base/regmap/regcache.c

@@ -264,7 +264,7 @@ int regcache_sync(struct regmap *map)
 
 	BUG_ON(!map->cache_ops || !map->cache_ops->sync);
 
-	mutex_lock(&map->lock);
+	map->lock(map);
 	/* Remember the initial bypass state */
 	bypass = map->cache_bypass;
 	dev_dbg(map->dev, "Syncing %s cache\n",
@@ -296,7 +296,7 @@ out:
 	trace_regcache_sync(map->dev, name, "stop");
 	/* Restore the bypass state */
 	map->cache_bypass = bypass;
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 
 	return ret;
 }
@@ -323,7 +323,7 @@ int regcache_sync_region(struct regmap *map, unsigned int min,
 
 	BUG_ON(!map->cache_ops || !map->cache_ops->sync);
 
-	mutex_lock(&map->lock);
+	map->lock(map);
 
 	/* Remember the initial bypass state */
 	bypass = map->cache_bypass;
@@ -342,7 +342,7 @@ out:
 	trace_regcache_sync(map->dev, name, "stop region");
 	/* Restore the bypass state */
 	map->cache_bypass = bypass;
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 
 	return ret;
 }
@@ -362,11 +362,11 @@ EXPORT_SYMBOL_GPL(regcache_sync_region);
  */
 void regcache_cache_only(struct regmap *map, bool enable)
 {
-	mutex_lock(&map->lock);
+	map->lock(map);
 	WARN_ON(map->cache_bypass && enable);
 	map->cache_only = enable;
 	trace_regmap_cache_only(map->dev, enable);
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 }
 EXPORT_SYMBOL_GPL(regcache_cache_only);
 
@@ -381,9 +381,9 @@ EXPORT_SYMBOL_GPL(regcache_cache_only);
  */
 void regcache_mark_dirty(struct regmap *map)
 {
-	mutex_lock(&map->lock);
+	map->lock(map);
 	map->cache_dirty = true;
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 }
 EXPORT_SYMBOL_GPL(regcache_mark_dirty);
 
@@ -400,11 +400,11 @@ EXPORT_SYMBOL_GPL(regcache_mark_dirty);
  */
 void regcache_cache_bypass(struct regmap *map, bool enable)
 {
-	mutex_lock(&map->lock);
+	map->lock(map);
 	WARN_ON(map->cache_only && enable);
 	map->cache_bypass = enable;
 	trace_regmap_cache_bypass(map->dev, enable);
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 }
 EXPORT_SYMBOL_GPL(regcache_cache_bypass);
 

drivers/base/regmap/regmap-debugfs.c

@@ -242,10 +242,17 @@ static const struct file_operations regmap_access_fops = {
 	.llseek = default_llseek,
 };
 
-void regmap_debugfs_init(struct regmap *map)
+void regmap_debugfs_init(struct regmap *map, const char *name)
 {
-	map->debugfs = debugfs_create_dir(dev_name(map->dev),
-					  regmap_debugfs_root);
+	if (name) {
+		map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
+					      dev_name(map->dev), name);
+		name = map->debugfs_name;
+	} else {
+		name = dev_name(map->dev);
+	}
+
+	map->debugfs = debugfs_create_dir(name, regmap_debugfs_root);
 	if (!map->debugfs) {
 		dev_warn(map->dev, "Failed to create debugfs directory\n");
 		return;
@@ -274,6 +281,7 @@ void regmap_debugfs_init(struct regmap *map)
 void regmap_debugfs_exit(struct regmap *map)
 {
 	debugfs_remove_recursive(map->debugfs);
+	kfree(map->debugfs_name);
 }
 
 void regmap_debugfs_initcall(void)

drivers/base/regmap/regmap-i2c.c

@@ -15,8 +15,9 @@
 #include <linux/module.h>
 #include <linux/init.h>
 
-static int regmap_i2c_write(struct device *dev, const void *data, size_t count)
+static int regmap_i2c_write(void *context, const void *data, size_t count)
 {
+	struct device *dev = context;
 	struct i2c_client *i2c = to_i2c_client(dev);
 	int ret;
 
@@ -29,10 +30,11 @@ static int regmap_i2c_write(struct device *dev, const void *data, size_t count)
 		return -EIO;
 }
 
-static int regmap_i2c_gather_write(struct device *dev,
+static int regmap_i2c_gather_write(void *context,
 				   const void *reg, size_t reg_size,
 				   const void *val, size_t val_size)
 {
+	struct device *dev = context;
 	struct i2c_client *i2c = to_i2c_client(dev);
 	struct i2c_msg xfer[2];
 	int ret;
@@ -62,10 +64,11 @@ static int regmap_i2c_gather_write(struct device *dev,
 		return -EIO;
 }
 
-static int regmap_i2c_read(struct device *dev,
+static int regmap_i2c_read(void *context,
 			   const void *reg, size_t reg_size,
 			   void *val, size_t val_size)
 {
+	struct device *dev = context;
 	struct i2c_client *i2c = to_i2c_client(dev);
 	struct i2c_msg xfer[2];
 	int ret;
@@ -107,7 +110,7 @@ static struct regmap_bus regmap_i2c = {
 struct regmap *regmap_init_i2c(struct i2c_client *i2c,
 			       const struct regmap_config *config)
 {
-	return regmap_init(&i2c->dev, &regmap_i2c, config);
+	return regmap_init(&i2c->dev, &regmap_i2c, &i2c->dev, config);
 }
 EXPORT_SYMBOL_GPL(regmap_init_i2c);
 
@@ -124,7 +127,7 @@ EXPORT_SYMBOL_GPL(regmap_init_i2c);
 struct regmap *devm_regmap_init_i2c(struct i2c_client *i2c,
 				    const struct regmap_config *config)
 {
-	return devm_regmap_init(&i2c->dev, &regmap_i2c, config);
+	return devm_regmap_init(&i2c->dev, &regmap_i2c, &i2c->dev, config);
 }
 EXPORT_SYMBOL_GPL(devm_regmap_init_i2c);
 

drivers/base/regmap/regmap-mmio.c

@@ -0,0 +1,211 @@
+/*
+ * Register map access API - MMIO support
+ *
+ * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+struct regmap_mmio_context {
+	void __iomem *regs;
+	unsigned val_bytes;
+};
+
+static int regmap_mmio_gather_write(void *context,
+				    const void *reg, size_t reg_size,
+				    const void *val, size_t val_size)
+{
+	struct regmap_mmio_context *ctx = context;
+	u32 offset;
+
+	BUG_ON(reg_size != 4);
+
+	offset = be32_to_cpup(reg);
+
+	while (val_size) {
+		switch (ctx->val_bytes) {
+		case 1:
+			writeb(*(u8 *)val, ctx->regs + offset);
+			break;
+		case 2:
+			writew(be16_to_cpup(val), ctx->regs + offset);
+			break;
+		case 4:
+			writel(be32_to_cpup(val), ctx->regs + offset);
+			break;
+#ifdef CONFIG_64BIT
+		case 8:
+			writeq(be64_to_cpup(val), ctx->regs + offset);
+			break;
+#endif
+		default:
+			/* Should be caught by regmap_mmio_check_config */
+			BUG();
+		}
+		val_size -= ctx->val_bytes;
+		val += ctx->val_bytes;
+		offset += ctx->val_bytes;
+	}
+
+	return 0;
+}
+
+static int regmap_mmio_write(void *context, const void *data, size_t count)
+{
+	BUG_ON(count < 4);
+
+	return regmap_mmio_gather_write(context, data, 4, data + 4, count - 4);
+}
+
+static int regmap_mmio_read(void *context,
+			    const void *reg, size_t reg_size,
+			    void *val, size_t val_size)
+{
+	struct regmap_mmio_context *ctx = context;
+	u32 offset;
+
+	BUG_ON(reg_size != 4);
+
+	offset = be32_to_cpup(reg);
+
+	while (val_size) {
+		switch (ctx->val_bytes) {
+		case 1:
+			*(u8 *)val = readb(ctx->regs + offset);
+			break;
+		case 2:
+			*(u16 *)val = cpu_to_be16(readw(ctx->regs + offset));
+			break;
+		case 4:
+			*(u32 *)val = cpu_to_be32(readl(ctx->regs + offset));
+			break;
+#ifdef CONFIG_64BIT
+		case 8:
+			*(u64 *)val = cpu_to_be32(readq(ctx->regs + offset));
+			break;
+#endif
+		default:
+			/* Should be caught by regmap_mmio_check_config */
+			BUG();
+		}
+		val_size -= ctx->val_bytes;
+		val += ctx->val_bytes;
+		offset += ctx->val_bytes;
+	}
+
+	return 0;
+}
+
+static void regmap_mmio_free_context(void *context)
+{
+	kfree(context);
+}
+
+static struct regmap_bus regmap_mmio = {
+	.fast_io = true,
+	.write = regmap_mmio_write,
+	.gather_write = regmap_mmio_gather_write,
+	.read = regmap_mmio_read,
+	.free_context = regmap_mmio_free_context,
+};
+
+struct regmap_mmio_context *regmap_mmio_gen_context(void __iomem *regs,
+					const struct regmap_config *config)
+{
+	struct regmap_mmio_context *ctx;
+
+	if (config->reg_bits != 32)
+		return ERR_PTR(-EINVAL);
+
+	if (config->pad_bits)
+		return ERR_PTR(-EINVAL);
+
+	switch (config->val_bits) {
+	case 8:
+	case 16:
+	case 32:
+#ifdef CONFIG_64BIT
+	case 64:
+#endif
+		break;
+	default:
+		return ERR_PTR(-EINVAL);
+	}
+
+	ctx = kzalloc(GFP_KERNEL, sizeof(*ctx));
+	if (!ctx)
+		return ERR_PTR(-ENOMEM);
+
+	ctx->regs = regs;
+	ctx->val_bytes = config->val_bits / 8;
+
+	return ctx;
+}
+
+/**
+ * regmap_init_mmio(): Initialise register map
+ *
+ * @dev: Device that will be interacted with
+ * @regs: Pointer to memory-mapped IO region
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer to
+ * a struct regmap.
+ */
+struct regmap *regmap_init_mmio(struct device *dev,
+				void __iomem *regs,
+				const struct regmap_config *config)
+{
+	struct regmap_mmio_context *ctx;
+
+	ctx = regmap_mmio_gen_context(regs, config);
+	if (IS_ERR(ctx))
+		return ERR_CAST(ctx);
+
+	return regmap_init(dev, &regmap_mmio, ctx, config);
+}
+EXPORT_SYMBOL_GPL(regmap_init_mmio);
+
+/**
+ * devm_regmap_init_mmio(): Initialise managed register map
+ *
+ * @dev: Device that will be interacted with
+ * @regs: Pointer to memory-mapped IO region
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer
+ * to a struct regmap.  The regmap will be automatically freed by the
+ * device management code.
+ */
+struct regmap *devm_regmap_init_mmio(struct device *dev,
+				     void __iomem *regs,
+				     const struct regmap_config *config)
+{
+	struct regmap_mmio_context *ctx;
+
+	ctx = regmap_mmio_gen_context(regs, config);
+	if (IS_ERR(ctx))
+		return ERR_CAST(ctx);
+
+	return devm_regmap_init(dev, &regmap_mmio, ctx, config);
+}
+EXPORT_SYMBOL_GPL(devm_regmap_init_mmio);
+
+MODULE_LICENSE("GPL v2");

drivers/base/regmap/regmap-spi.c

@@ -15,17 +15,19 @@
 #include <linux/init.h>
 #include <linux/module.h>
 
-static int regmap_spi_write(struct device *dev, const void *data, size_t count)
+static int regmap_spi_write(void *context, const void *data, size_t count)
 {
+	struct device *dev = context;
 	struct spi_device *spi = to_spi_device(dev);
 
 	return spi_write(spi, data, count);
 }
 
-static int regmap_spi_gather_write(struct device *dev,
+static int regmap_spi_gather_write(void *context,
 				   const void *reg, size_t reg_len,
 				   const void *val, size_t val_len)
 {
+	struct device *dev = context;
 	struct spi_device *spi = to_spi_device(dev);
 	struct spi_message m;
 	struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
@@ -38,10 +40,11 @@ static int regmap_spi_gather_write(struct device *dev,
 	return spi_sync(spi, &m);
 }
 
-static int regmap_spi_read(struct device *dev,
+static int regmap_spi_read(void *context,
 			   const void *reg, size_t reg_size,
 			   void *val, size_t val_size)
 {
+	struct device *dev = context;
 	struct spi_device *spi = to_spi_device(dev);
 
 	return spi_write_then_read(spi, reg, reg_size, val, val_size);
@@ -66,7 +69,7 @@ static struct regmap_bus regmap_spi = {
 struct regmap *regmap_init_spi(struct spi_device *spi,
 			       const struct regmap_config *config)
 {
-	return regmap_init(&spi->dev, &regmap_spi, config);
+	return regmap_init(&spi->dev, &regmap_spi, &spi->dev, config);
 }
 EXPORT_SYMBOL_GPL(regmap_init_spi);
 
@@ -83,7 +86,7 @@ EXPORT_SYMBOL_GPL(regmap_init_spi);
 struct regmap *devm_regmap_init_spi(struct spi_device *spi,
 				    const struct regmap_config *config)
 {
-	return devm_regmap_init(&spi->dev, &regmap_spi, config);
+	return devm_regmap_init(&spi->dev, &regmap_spi, &spi->dev, config);
 }
 EXPORT_SYMBOL_GPL(devm_regmap_init_spi);
 

drivers/base/regmap/regmap.c

@@ -112,25 +112,36 @@ static void regmap_format_10_14_write(struct regmap *map,
 	out[0] = reg >> 2;
 }
 
-static void regmap_format_8(void *buf, unsigned int val)
+static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
 {
 	u8 *b = buf;
 
-	b[0] = val;
+	b[0] = val << shift;
 }
 
-static void regmap_format_16(void *buf, unsigned int val)
+static void regmap_format_16(void *buf, unsigned int val, unsigned int shift)
 {
 	__be16 *b = buf;
 
-	b[0] = cpu_to_be16(val);
+	b[0] = cpu_to_be16(val << shift);
 }
 
-static void regmap_format_32(void *buf, unsigned int val)
+static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
+{
+	u8 *b = buf;
+
+	val <<= shift;
+
+	b[0] = val >> 16;
+	b[1] = val >> 8;
+	b[2] = val;
+}
+
+static void regmap_format_32(void *buf, unsigned int val, unsigned int shift)
 {
 	__be32 *b = buf;
 
-	b[0] = cpu_to_be32(val);
+	b[0] = cpu_to_be32(val << shift);
 }
 
 static unsigned int regmap_parse_8(void *buf)
@@ -149,6 +160,16 @@ static unsigned int regmap_parse_16(void *buf)
 	return b[0];
 }
 
+static unsigned int regmap_parse_24(void *buf)
+{
+	u8 *b = buf;
+	unsigned int ret = b[2];
+	ret |= ((unsigned int)b[1]) << 8;
+	ret |= ((unsigned int)b[0]) << 16;
+
+	return ret;
+}
+
 static unsigned int regmap_parse_32(void *buf)
 {
 	__be32 *b = buf;
@@ -158,11 +179,32 @@ static unsigned int regmap_parse_32(void *buf)
 	return b[0];
 }
 
+static void regmap_lock_mutex(struct regmap *map)
+{
+	mutex_lock(&map->mutex);
+}
+
+static void regmap_unlock_mutex(struct regmap *map)
+{
+	mutex_unlock(&map->mutex);
+}
+
+static void regmap_lock_spinlock(struct regmap *map)
+{
+	spin_lock(&map->spinlock);
+}
+
+static void regmap_unlock_spinlock(struct regmap *map)
+{
+	spin_unlock(&map->spinlock);
+}
+
 /**
  * regmap_init(): Initialise register map
  *
  * @dev: Device that will be interacted with
  * @bus: Bus-specific callbacks to use with device
+ * @bus_context: Data passed to bus-specific callbacks
  * @config: Configuration for register map
  *
  * The return value will be an ERR_PTR() on error or a valid pointer to
@@ -171,6 +213,7 @@ static unsigned int regmap_parse_32(void *buf)
  */
 struct regmap *regmap_init(struct device *dev,
 			   const struct regmap_bus *bus,
+			   void *bus_context,
 			   const struct regmap_config *config)
 {
 	struct regmap *map;
@@ -185,14 +228,24 @@ struct regmap *regmap_init(struct device *dev,
 		goto err;
 	}
 
-	mutex_init(&map->lock);
+	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->format.buf_size = (config->reg_bits + config->val_bits) / 8;
 	map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
 	map->format.pad_bytes = config->pad_bits / 8;
 	map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
 	map->format.buf_size += map->format.pad_bytes;
+	map->reg_shift = config->pad_bits % 8;
 	map->dev = dev;
 	map->bus = bus;
+	map->bus_context = bus_context;
 	map->max_register = config->max_register;
 	map->writeable_reg = config->writeable_reg;
 	map->readable_reg = config->readable_reg;
@@ -207,7 +260,7 @@ struct regmap *regmap_init(struct device *dev,
 		map->read_flag_mask = bus->read_flag_mask;
 	}
 
-	switch (config->reg_bits) {
+	switch (config->reg_bits + map->reg_shift) {
 	case 2:
 		switch (config->val_bits) {
 		case 6:
@@ -273,6 +326,10 @@ struct regmap *regmap_init(struct device *dev,
 		map->format.format_val = regmap_format_16;
 		map->format.parse_val = regmap_parse_16;
 		break;
+	case 24:
+		map->format.format_val = regmap_format_24;
+		map->format.parse_val = regmap_parse_24;
+		break;
 	case 32:
 		map->format.format_val = regmap_format_32;
 		map->format.parse_val = regmap_parse_32;
@@ -289,7 +346,7 @@ struct regmap *regmap_init(struct device *dev,
 		goto err_map;
 	}
 
-	regmap_debugfs_init(map);
+	regmap_debugfs_init(map, config->name);
 
 	ret = regcache_init(map, config);
 	if (ret < 0)
@@ -316,6 +373,7 @@ static void devm_regmap_release(struct device *dev, void *res)
  *
  * @dev: Device that will be interacted with
  * @bus: Bus-specific callbacks to use with device
+ * @bus_context: Data passed to bus-specific callbacks
  * @config: Configuration for register map
  *
  * The return value will be an ERR_PTR() on error or a valid pointer
@@ -325,6 +383,7 @@ static void devm_regmap_release(struct device *dev, void *res)
  */
 struct regmap *devm_regmap_init(struct device *dev,
 				const struct regmap_bus *bus,
+				void *bus_context,
 				const struct regmap_config *config)
 {
 	struct regmap **ptr, *regmap;
@@ -333,7 +392,7 @@ struct regmap *devm_regmap_init(struct device *dev,
 	if (!ptr)
 		return ERR_PTR(-ENOMEM);
 
-	regmap = regmap_init(dev, bus, config);
+	regmap = regmap_init(dev, bus, bus_context, config);
 	if (!IS_ERR(regmap)) {
 		*ptr = regmap;
 		devres_add(dev, ptr);
@@ -360,7 +419,7 @@ int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
 {
 	int ret;
 
-	mutex_lock(&map->lock);
+	map->lock(map);
 
 	regcache_exit(map);
 	regmap_debugfs_exit(map);
@@ -372,14 +431,14 @@ int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
 	map->precious_reg = config->precious_reg;
 	map->cache_type = config->cache_type;
 
-	regmap_debugfs_init(map);
+	regmap_debugfs_init(map, config->name);
 
 	map->cache_bypass = false;
 	map->cache_only = false;
 
 	ret = regcache_init(map, config);
 
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 
 	return ret;
 }
@@ -391,6 +450,8 @@ void regmap_exit(struct regmap *map)
 {
 	regcache_exit(map);
 	regmap_debugfs_exit(map);
+	if (map->bus->free_context)
+		map->bus->free_context(map->bus_context);
 	kfree(map->work_buf);
 	kfree(map);
 }
@@ -431,7 +492,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
 		}
 	}
 
-	map->format.format_reg(map->work_buf, reg);
+	map->format.format_reg(map->work_buf, reg, map->reg_shift);
 
 	u8[0] |= map->write_flag_mask;
 
@@ -444,12 +505,12 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
 	 */
 	if (val == (map->work_buf + map->format.pad_bytes +
 		    map->format.reg_bytes))
-		ret = map->bus->write(map->dev, map->work_buf,
+		ret = map->bus->write(map->bus_context, map->work_buf,
 				      map->format.reg_bytes +
 				      map->format.pad_bytes +
 				      val_len);
 	else if (map->bus->gather_write)
-		ret = map->bus->gather_write(map->dev, map->work_buf,
+		ret = map->bus->gather_write(map->bus_context, map->work_buf,
 					     map->format.reg_bytes +
 					     map->format.pad_bytes,
 					     val, val_len);
@@ -464,7 +525,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
 		memcpy(buf, map->work_buf, map->format.reg_bytes);
 		memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
 		       val, val_len);
-		ret = map->bus->write(map->dev, buf, len);
+		ret = map->bus->write(map->bus_context, buf, len);
 
 		kfree(buf);
 	}
@@ -498,7 +559,7 @@ int _regmap_write(struct regmap *map, unsigned int reg,
 
 		trace_regmap_hw_write_start(map->dev, reg, 1);
 
-		ret = map->bus->write(map->dev, map->work_buf,
+		ret = map->bus->write(map->bus_context, map->work_buf,
 				      map->format.buf_size);
 
 		trace_regmap_hw_write_done(map->dev, reg, 1);
@@ -506,7 +567,7 @@ int _regmap_write(struct regmap *map, unsigned int reg,
 		return ret;
 	} else {
 		map->format.format_val(map->work_buf + map->format.reg_bytes
-				       + map->format.pad_bytes, val);
+				       + map->format.pad_bytes, val, 0);
 		return _regmap_raw_write(map, reg,
 					 map->work_buf +
 					 map->format.reg_bytes +
@@ -529,11 +590,11 @@ int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
 {
 	int ret;
 
-	mutex_lock(&map->lock);
+	map->lock(map);
 
 	ret = _regmap_write(map, reg, val);
 
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 
 	return ret;
 }
@@ -560,11 +621,14 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
 {
 	int ret;
 
-	mutex_lock(&map->lock);
+	if (val_len % map->format.val_bytes)
+		return -EINVAL;
+
+	map->lock(map);
 
 	ret = _regmap_raw_write(map, reg, val, val_len);
 
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 
 	return ret;
 }
@@ -594,7 +658,7 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
 	if (!map->format.parse_val)
 		return -EINVAL;
 
-	mutex_lock(&map->lock);
+	map->lock(map);
 
 	/* No formatting is require if val_byte is 1 */
 	if (val_bytes == 1) {
@@ -615,7 +679,7 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
 		kfree(wval);
 
 out:
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(regmap_bulk_write);
@@ -626,7 +690,7 @@ static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 	u8 *u8 = map->work_buf;
 	int ret;
 
-	map->format.format_reg(map->work_buf, reg);
+	map->format.format_reg(map->work_buf, reg, map->reg_shift);
 
 	/*
 	 * Some buses or devices flag reads by setting the high bits in the
@@ -639,7 +703,7 @@ static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 	trace_regmap_hw_read_start(map->dev, reg,
 				   val_len / map->format.val_bytes);
 
-	ret = map->bus->read(map->dev, map->work_buf,
+	ret = map->bus->read(map->bus_context, map->work_buf,
 			     map->format.reg_bytes + map->format.pad_bytes,
 			     val, val_len);
 
@@ -689,11 +753,11 @@ int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
 {
 	int ret;
 
-	mutex_lock(&map->lock);
+	map->lock(map);
 
 	ret = _regmap_read(map, reg, val);
 
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 
 	return ret;
 }
@@ -718,7 +782,10 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 	unsigned int v;
 	int ret, i;
 
-	mutex_lock(&map->lock);
+	if (val_len % map->format.val_bytes)
+		return -EINVAL;
+
+	map->lock(map);
 
 	if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
 	    map->cache_type == REGCACHE_NONE) {
@@ -734,12 +801,12 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 			if (ret != 0)
 				goto out;
 
-			map->format.format_val(val + (i * val_bytes), v);
+			map->format.format_val(val + (i * val_bytes), v, 0);
 		}
 	}
 
  out:
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 
 	return ret;
 }
@@ -792,7 +859,7 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg,
 	int ret;
 	unsigned int tmp, orig;
 
-	mutex_lock(&map->lock);
+	map->lock(map);
 
 	ret = _regmap_read(map, reg, &orig);
 	if (ret != 0)
@@ -809,7 +876,7 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg,
 	}
 
 out:
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 
 	return ret;
 }
@@ -876,7 +943,7 @@ int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
 	if (map->patch)
 		return -EBUSY;
 
-	mutex_lock(&map->lock);
+	map->lock(map);
 
 	bypass = map->cache_bypass;
 
@@ -904,7 +971,7 @@ int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
 out:
 	map->cache_bypass = bypass;
 
-	mutex_unlock(&map->lock);
+	map->unlock(map);
 
 	return ret;
 }

include/linux/regmap.h

@@ -46,6 +46,9 @@ struct reg_default {
 /**
  * Configuration for the register map of a device.
  *
+ * @name: Optional name of the regmap. Useful when a device has multiple
+ *        register regions.
+ *
  * @reg_bits: Number of bits in a register address, mandatory.
  * @pad_bits: Number of bits of padding between register and value.
  * @val_bits: Number of bits in a register value, mandatory.
@@ -77,6 +80,8 @@ struct reg_default {
  * @num_reg_defaults_raw: Number of elements in reg_defaults_raw.
  */
 struct regmap_config {
+	const char *name;
+
 	int reg_bits;
 	int pad_bits;
 	int val_bits;
@@ -97,18 +102,21 @@ struct regmap_config {
 	u8 write_flag_mask;
 };
 
-typedef int (*regmap_hw_write)(struct device *dev, const void *data,
+typedef int (*regmap_hw_write)(void *context, const void *data,
 			       size_t count);
-typedef int (*regmap_hw_gather_write)(struct device *dev,
+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_read)(struct device *dev,
+typedef int (*regmap_hw_read)(void *context,
 			      const void *reg_buf, size_t reg_size,
 			      void *val_buf, size_t val_size);
+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.
  * @write: Write operation.
  * @gather_write: Write operation with split register/value, return -ENOTSUPP
  *                if not implemented  on a given device.
@@ -118,27 +126,37 @@ typedef int (*regmap_hw_read)(struct device *dev,
  *                  a read.
  */
 struct regmap_bus {
+	bool fast_io;
 	regmap_hw_write write;
 	regmap_hw_gather_write gather_write;
 	regmap_hw_read read;
+	regmap_hw_free_context free_context;
 	u8 read_flag_mask;
 };
 
 struct regmap *regmap_init(struct device *dev,
 			   const struct regmap_bus *bus,
+			   void *bus_context,
 			   const struct regmap_config *config);
 struct regmap *regmap_init_i2c(struct i2c_client *i2c,
 			       const struct regmap_config *config);
 struct regmap *regmap_init_spi(struct spi_device *dev,
 			       const struct regmap_config *config);
+struct regmap *regmap_init_mmio(struct device *dev,
+				void __iomem *regs,
+				const struct regmap_config *config);
 
 struct regmap *devm_regmap_init(struct device *dev,
 				const struct regmap_bus *bus,
+				void *bus_context,
 				const struct regmap_config *config);
 struct regmap *devm_regmap_init_i2c(struct i2c_client *i2c,
 				    const struct regmap_config *config);
 struct regmap *devm_regmap_init_spi(struct spi_device *dev,
 				    const struct regmap_config *config);
+struct regmap *devm_regmap_init_mmio(struct device *dev,
+				     void __iomem *regs,
+				     const struct regmap_config *config);
 
 void regmap_exit(struct regmap *map);
 int regmap_reinit_cache(struct regmap *map,