Merge tag 'regmap-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap

Pull regmap updates from Mark Brown:
 "Quite a few enhancements this time around, helpers and diagnostics for
  the most part which is good to see:

   - Addition of table based lookups for the register access checks from
     Davide Ciminaghi, making life easier for drivers with big blocks of
     similar registers.
   - Allow drivers to get the irqdomain for regmap irq_chips, allowing
     the domain to be used with other APIs.
   - Debug improvements for paged register maps.
   - Performance improvments for some of the diagnostic infrastructure,
     very helpful for devices with large register maps."

* tag 'regmap-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap:
  regmap: debugfs: Cache offsets of valid regions for dump
  regmap: debugfs: Factor out initial seek
  regmap: debugfs: Avoid overflows for very small reads
  regmap: Cache register and value sizes for debugfs
  regmap: introduce tables for readable/writeable/volatile/precious checks
  regmap: core: Report registers in hex when we can't cache
  regmap: Fix printing of size_t variable
  regmap: make lock/unlock functions customizable
  regmap: silence GCC warning
  regmap: Split raw writes that cross window boundaries
  regmap: Make return code checks consistent
  regmap: Factor range lookup out of page selection
  regmap: Provide debugfs read of register ranges
  regmap: Factor out debugfs register read
  regmap: Allow ranges to be named
  regmap: When we sanity check during range adds say what errors we find
  regmap: Rename n_ranges to num_ranges
  regmap: irq: Allow users to retrieve the irq_domain

drivers/base/regmap/internal.h

@@ -15,10 +15,18 @@
 
 #include <linux/regmap.h>
 #include <linux/fs.h>
+#include <linux/list.h>
 
 struct regmap;
 struct regcache_ops;
 
+struct regmap_debugfs_off_cache {
+	struct list_head list;
+	off_t min;
+	off_t max;
+	unsigned int base_reg;
+};
+
 struct regmap_format {
 	size_t buf_size;
 	size_t reg_bytes;
@@ -31,14 +39,12 @@ struct regmap_format {
 	unsigned int (*parse_val)(void *buf);
 };
 
-typedef void (*regmap_lock)(struct regmap *map);
-typedef void (*regmap_unlock)(struct regmap *map);
-
 struct regmap {
 	struct mutex mutex;
 	spinlock_t spinlock;
 	regmap_lock lock;
 	regmap_unlock unlock;
+	void *lock_arg; /* This is passed to lock/unlock functions */
 
 	struct device *dev; /* Device we do I/O on */
 	void *work_buf;     /* Scratch buffer used to format I/O */
@@ -50,6 +56,12 @@ struct regmap {
 #ifdef CONFIG_DEBUG_FS
 	struct dentry *debugfs;
 	const char *debugfs_name;
+
+	unsigned int debugfs_reg_len;
+	unsigned int debugfs_val_len;
+	unsigned int debugfs_tot_len;
+
+	struct list_head debugfs_off_cache;
 #endif
 
 	unsigned int max_register;
@@ -57,6 +69,10 @@ struct regmap {
 	bool (*readable_reg)(struct device *dev, unsigned int reg);
 	bool (*volatile_reg)(struct device *dev, unsigned int reg);
 	bool (*precious_reg)(struct device *dev, unsigned int reg);
+	const struct regmap_access_table *wr_table;
+	const struct regmap_access_table *rd_table;
+	const struct regmap_access_table *volatile_table;
+	const struct regmap_access_table *precious_table;
 
 	u8 read_flag_mask;
 	u8 write_flag_mask;
@@ -120,6 +136,8 @@ int _regmap_write(struct regmap *map, unsigned int reg,
 
 struct regmap_range_node {
 	struct rb_node node;
+	const char *name;
+	struct regmap *map;
 
 	unsigned int range_min;
 	unsigned int range_max;

drivers/base/regmap/regmap-debugfs.c

@@ -56,17 +56,74 @@ static const struct file_operations regmap_name_fops = {
 	.llseek = default_llseek,
 };
 
-static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
-				    size_t count, loff_t *ppos)
+/*
+ * Work out where the start offset maps into register numbers, bearing
+ * in mind that we suppress hidden registers.
+ */
+static unsigned int regmap_debugfs_get_dump_start(struct regmap *map,
+						  unsigned int base,
+						  loff_t from,
+						  loff_t *pos)
 {
-	int reg_len, val_len, tot_len;
-	size_t buf_pos = 0;
+	struct regmap_debugfs_off_cache *c = NULL;
 	loff_t p = 0;
+	unsigned int i, ret;
+
+	/*
+	 * If we don't have a cache build one so we don't have to do a
+	 * linear scan each time.
+	 */
+	if (list_empty(&map->debugfs_off_cache)) {
+		for (i = base; i <= map->max_register; i += map->reg_stride) {
+			/* Skip unprinted registers, closing off cache entry */
+			if (!regmap_readable(map, i) ||
+			    regmap_precious(map, i)) {
+				if (c) {
+					c->max = p - 1;
+					list_add_tail(&c->list,
+						      &map->debugfs_off_cache);
+					c = NULL;
+				}
+
+				continue;
+			}
+
+			/* No cache entry?  Start a new one */
+			if (!c) {
+				c = kzalloc(sizeof(*c), GFP_KERNEL);
+				if (!c)
+					break;
+				c->min = p;
+				c->base_reg = i;
+			}
+
+			p += map->debugfs_tot_len;
+		}
+	}
+
+	/* Find the relevant block */
+	list_for_each_entry(c, &map->debugfs_off_cache, list) {
+		if (*pos >= c->min && *pos <= c->max) {
+			*pos = c->min;
+			return c->base_reg;
+		}
+
+		ret = c->max;
+	}
+
+	return ret;
+}
+
+static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
+				   unsigned int to, char __user *user_buf,
+				   size_t count, loff_t *ppos)
+{
+	size_t buf_pos = 0;
+	loff_t p = *ppos;
 	ssize_t ret;
 	int i;
-	struct regmap *map = file->private_data;
 	char *buf;
-	unsigned int val;
+	unsigned int val, start_reg;
 
 	if (*ppos < 0 || !count)
 		return -EINVAL;
@@ -76,11 +133,18 @@ static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
 		return -ENOMEM;
 
 	/* Calculate the length of a fixed format  */
-	reg_len = regmap_calc_reg_len(map->max_register, buf, count);
-	val_len = 2 * map->format.val_bytes;
-	tot_len = reg_len + val_len + 3;      /* : \n */
+	if (!map->debugfs_tot_len) {
+		map->debugfs_reg_len = regmap_calc_reg_len(map->max_register,
+							   buf, count);
+		map->debugfs_val_len = 2 * map->format.val_bytes;
+		map->debugfs_tot_len = map->debugfs_reg_len +
+			map->debugfs_val_len + 3;      /* : \n */
+	}
 
-	for (i = 0; i <= map->max_register; i += map->reg_stride) {
+	/* Work out which register we're starting at */
+	start_reg = regmap_debugfs_get_dump_start(map, from, *ppos, &p);
+
+	for (i = start_reg; i <= to; i += map->reg_stride) {
 		if (!regmap_readable(map, i))
 			continue;
 
@@ -90,26 +154,27 @@ static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
 		/* If we're in the region the user is trying to read */
 		if (p >= *ppos) {
 			/* ...but not beyond it */
-			if (buf_pos >= count - 1 - tot_len)
+			if (buf_pos + 1 + map->debugfs_tot_len >= count)
 				break;
 
 			/* Format the register */
 			snprintf(buf + buf_pos, count - buf_pos, "%.*x: ",
-				 reg_len, i);
-			buf_pos += reg_len + 2;
+				 map->debugfs_reg_len, i - from);
+			buf_pos += map->debugfs_reg_len + 2;
 
 			/* Format the value, write all X if we can't read */
 			ret = regmap_read(map, i, &val);
 			if (ret == 0)
 				snprintf(buf + buf_pos, count - buf_pos,
-					 "%.*x", val_len, val);
+					 "%.*x", map->debugfs_val_len, val);
 			else
-				memset(buf + buf_pos, 'X', val_len);
+				memset(buf + buf_pos, 'X',
+				       map->debugfs_val_len);
 			buf_pos += 2 * map->format.val_bytes;
 
 			buf[buf_pos++] = '\n';
 		}
-		p += tot_len;
+		p += map->debugfs_tot_len;
 	}
 
 	ret = buf_pos;
@@ -126,6 +191,15 @@ out:
 	return ret;
 }
 
+static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
+				    size_t count, loff_t *ppos)
+{
+	struct regmap *map = file->private_data;
+
+	return regmap_read_debugfs(map, 0, map->max_register, user_buf,
+				   count, ppos);
+}
+
 #undef REGMAP_ALLOW_WRITE_DEBUGFS
 #ifdef REGMAP_ALLOW_WRITE_DEBUGFS
 /*
@@ -174,6 +248,22 @@ static const struct file_operations regmap_map_fops = {
 	.llseek = default_llseek,
 };
 
+static ssize_t regmap_range_read_file(struct file *file, char __user *user_buf,
+				      size_t count, loff_t *ppos)
+{
+	struct regmap_range_node *range = file->private_data;
+	struct regmap *map = range->map;
+
+	return regmap_read_debugfs(map, range->range_min, range->range_max,
+				   user_buf, count, ppos);
+}
+
+static const struct file_operations regmap_range_fops = {
+	.open = simple_open,
+	.read = regmap_range_read_file,
+	.llseek = default_llseek,
+};
+
 static ssize_t regmap_access_read_file(struct file *file,
 				       char __user *user_buf, size_t count,
 				       loff_t *ppos)
@@ -244,6 +334,11 @@ static const struct file_operations regmap_access_fops = {
 
 void regmap_debugfs_init(struct regmap *map, const char *name)
 {
+	struct rb_node *next;
+	struct regmap_range_node *range_node;
+
+	INIT_LIST_HEAD(&map->debugfs_off_cache);
+
 	if (name) {
 		map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
 					      dev_name(map->dev), name);
@@ -276,11 +371,32 @@ void regmap_debugfs_init(struct regmap *map, const char *name)
 		debugfs_create_bool("cache_bypass", 0400, map->debugfs,
 				    &map->cache_bypass);
 	}
+
+	next = rb_first(&map->range_tree);
+	while (next) {
+		range_node = rb_entry(next, struct regmap_range_node, node);
+
+		if (range_node->name)
+			debugfs_create_file(range_node->name, 0400,
+					    map->debugfs, range_node,
+					    &regmap_range_fops);
+
+		next = rb_next(&range_node->node);
+	}
 }
 
 void regmap_debugfs_exit(struct regmap *map)
 {
+	struct regmap_debugfs_off_cache *c;
+
 	debugfs_remove_recursive(map->debugfs);
+	while (!list_empty(&map->debugfs_off_cache)) {
+		c = list_first_entry(&map->debugfs_off_cache,
+				     struct regmap_debugfs_off_cache,
+				     list);
+		list_del(&c->list);
+		kfree(c);
+	}
 	kfree(map->debugfs_name);
 }
 

drivers/base/regmap/regmap-irq.c

@@ -458,3 +458,22 @@ int regmap_irq_get_virq(struct regmap_irq_chip_data *data, int irq)
 	return irq_create_mapping(data->domain, irq);
 }
 EXPORT_SYMBOL_GPL(regmap_irq_get_virq);
+
+/**
+ * regmap_irq_get_domain(): Retrieve the irq_domain for the chip
+ *
+ * Useful for drivers to request their own IRQs and for integration
+ * with subsystems.  For ease of integration NULL is accepted as a
+ * domain, allowing devices to just call this even if no domain is
+ * allocated.
+ *
+ * @data: regmap_irq controller to operate on.
+ */
+struct irq_domain *regmap_irq_get_domain(struct regmap_irq_chip_data *data)
+{
+	if (data)
+		return data->domain;
+	else
+		return NULL;
+}
+EXPORT_SYMBOL_GPL(regmap_irq_get_domain);

drivers/base/regmap/regmap.c

@@ -34,6 +34,36 @@ static int _regmap_update_bits(struct regmap *map, unsigned int reg,
 			       unsigned int mask, unsigned int val,
 			       bool *change);
 
+bool regmap_reg_in_ranges(unsigned int reg,
+			  const struct regmap_range *ranges,
+			  unsigned int nranges)
+{
+	const struct regmap_range *r;
+	int i;
+
+	for (i = 0, r = ranges; i < nranges; i++, r++)
+		if (regmap_reg_in_range(reg, r))
+			return true;
+	return false;
+}
+EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
+
+static bool _regmap_check_range_table(struct regmap *map,
+				      unsigned int reg,
+				      const struct regmap_access_table *table)
+{
+	/* Check "no ranges" first */
+	if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges))
+		return false;
+
+	/* In case zero "yes ranges" are supplied, any reg is OK */
+	if (!table->n_yes_ranges)
+		return true;
+
+	return regmap_reg_in_ranges(reg, table->yes_ranges,
+				    table->n_yes_ranges);
+}
+
 bool regmap_writeable(struct regmap *map, unsigned int reg)
 {
 	if (map->max_register && reg > map->max_register)
@@ -42,6 +72,9 @@ bool regmap_writeable(struct regmap *map, unsigned int reg)
 	if (map->writeable_reg)
 		return map->writeable_reg(map->dev, reg);
 
+	if (map->wr_table)
+		return _regmap_check_range_table(map, reg, map->wr_table);
+
 	return true;
 }
 
@@ -56,6 +89,9 @@ bool regmap_readable(struct regmap *map, unsigned int reg)
 	if (map->readable_reg)
 		return map->readable_reg(map->dev, reg);
 
+	if (map->rd_table)
+		return _regmap_check_range_table(map, reg, map->rd_table);
+
 	return true;
 }
 
@@ -67,6 +103,9 @@ bool regmap_volatile(struct regmap *map, unsigned int reg)
 	if (map->volatile_reg)
 		return map->volatile_reg(map->dev, reg);
 
+	if (map->volatile_table)
+		return _regmap_check_range_table(map, reg, map->volatile_table);
+
 	return true;
 }
 
@@ -78,11 +117,14 @@ bool regmap_precious(struct regmap *map, unsigned int reg)
 	if (map->precious_reg)
 		return map->precious_reg(map->dev, reg);
 
+	if (map->precious_table)
+		return _regmap_check_range_table(map, reg, map->precious_table);
+
 	return false;
 }
 
 static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
-	unsigned int num)
+	size_t num)
 {
 	unsigned int i;
 
@@ -214,23 +256,27 @@ static unsigned int regmap_parse_32_native(void *buf)
 	return *(u32 *)buf;
 }
 
-static void regmap_lock_mutex(struct regmap *map)
+static void regmap_lock_mutex(void *__map)
 {
+	struct regmap *map = __map;
 	mutex_lock(&map->mutex);
 }
 
-static void regmap_unlock_mutex(struct regmap *map)
+static void regmap_unlock_mutex(void *__map)
 {
+	struct regmap *map = __map;
 	mutex_unlock(&map->mutex);
 }
 
-static void regmap_lock_spinlock(struct regmap *map)
+static void regmap_lock_spinlock(void *__map)
 {
+	struct regmap *map = __map;
 	spin_lock(&map->spinlock);
 }
 
-static void regmap_unlock_spinlock(struct regmap *map)
+static void regmap_unlock_spinlock(void *__map)
 {
+	struct regmap *map = __map;
 	spin_unlock(&map->spinlock);
 }
 
@@ -335,14 +381,21 @@ struct regmap *regmap_init(struct device *dev,
 		goto err;
 	}
 
-	if (bus->fast_io) {
-		spin_lock_init(&map->spinlock);
-		map->lock = regmap_lock_spinlock;
-		map->unlock = regmap_unlock_spinlock;
+	if (config->lock && config->unlock) {
+		map->lock = config->lock;
+		map->unlock = config->unlock;
+		map->lock_arg = config->lock_arg;
 	} else {
-		mutex_init(&map->mutex);
-		map->lock = regmap_lock_mutex;
-		map->unlock = regmap_unlock_mutex;
+		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->lock_arg = map;
 	}
 	map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
 	map->format.pad_bytes = config->pad_bits / 8;
@@ -359,6 +412,10 @@ struct regmap *regmap_init(struct device *dev,
 	map->bus = bus;
 	map->bus_context = bus_context;
 	map->max_register = config->max_register;
+	map->wr_table = config->wr_table;
+	map->rd_table = config->rd_table;
+	map->volatile_table = config->volatile_table;
+	map->precious_table = config->precious_table;
 	map->writeable_reg = config->writeable_reg;
 	map->readable_reg = config->readable_reg;
 	map->volatile_reg = config->volatile_reg;
@@ -519,20 +576,38 @@ struct regmap *regmap_init(struct device *dev,
 	}
 
 	map->range_tree = RB_ROOT;
-	for (i = 0; i < config->n_ranges; i++) {
+	for (i = 0; i < config->num_ranges; i++) {
 		const struct regmap_range_cfg *range_cfg = &config->ranges[i];
 		struct regmap_range_node *new;
 
 		/* Sanity check */
-		if (range_cfg->range_max < range_cfg->range_min ||
-		    range_cfg->range_max > map->max_register ||
-		    range_cfg->selector_reg > map->max_register ||
-		    range_cfg->window_len == 0)
+		if (range_cfg->range_max < range_cfg->range_min) {
+			dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
+				range_cfg->range_max, range_cfg->range_min);
+			goto err_range;
+		}
+
+		if (range_cfg->range_max > map->max_register) {
+			dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
+				range_cfg->range_max, map->max_register);
+			goto err_range;
+		}
+
+		if (range_cfg->selector_reg > map->max_register) {
+			dev_err(map->dev,
+				"Invalid range %d: selector out of map\n", i);
+			goto err_range;
+		}
+
+		if (range_cfg->window_len == 0) {
+			dev_err(map->dev, "Invalid range %d: window_len 0\n",
+				i);
 			goto err_range;
+		}
 
 		/* Make sure, that this register range has no selector
 		   or data window within its boundary */
-		for (j = 0; j < config->n_ranges; j++) {
+		for (j = 0; j < config->num_ranges; j++) {
 			unsigned sel_reg = config->ranges[j].selector_reg;
 			unsigned win_min = config->ranges[j].window_start;
 			unsigned win_max = win_min +
@@ -540,11 +615,17 @@ struct regmap *regmap_init(struct device *dev,
 
 			if (range_cfg->range_min <= sel_reg &&
 			    sel_reg <= range_cfg->range_max) {
+				dev_err(map->dev,
+					"Range %d: selector for %d in window\n",
+					i, j);
 				goto err_range;
 			}
 
 			if (!(win_max < range_cfg->range_min ||
 			      win_min > range_cfg->range_max)) {
+				dev_err(map->dev,
+					"Range %d: window for %d in window\n",
+					i, j);
 				goto err_range;
 			}
 		}
@@ -555,6 +636,8 @@ struct regmap *regmap_init(struct device *dev,
 			goto err_range;
 		}
 
+		new->map = map;
+		new->name = range_cfg->name;
 		new->range_min = range_cfg->range_min;
 		new->range_max = range_cfg->range_max;
 		new->selector_reg = range_cfg->selector_reg;
@@ -564,6 +647,7 @@ struct regmap *regmap_init(struct device *dev,
 		new->window_len = range_cfg->window_len;
 
 		if (_regmap_range_add(map, new) == false) {
+			dev_err(map->dev, "Failed to add range %d\n", i);
 			kfree(new);
 			goto err_range;
 		}
@@ -579,7 +663,7 @@ struct regmap *regmap_init(struct device *dev,
 	}
 
 	ret = regcache_init(map, config);
-	if (ret < 0)
+	if (ret != 0)
 		goto err_range;
 
 	regmap_debugfs_init(map, config->name);
@@ -738,59 +822,57 @@ struct regmap *dev_get_regmap(struct device *dev, const char *name)
 EXPORT_SYMBOL_GPL(dev_get_regmap);
 
 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
+			       struct regmap_range_node *range,
 			       unsigned int val_num)
 {
-	struct regmap_range_node *range;
 	void *orig_work_buf;
 	unsigned int win_offset;
 	unsigned int win_page;
 	bool page_chg;
 	int ret;
 
-	range = _regmap_range_lookup(map, *reg);
-	if (range) {
-		win_offset = (*reg - range->range_min) % range->window_len;
-		win_page = (*reg - range->range_min) / range->window_len;
-
-		if (val_num > 1) {
-			/* Bulk write shouldn't cross range boundary */
-			if (*reg + val_num - 1 > range->range_max)
-				return -EINVAL;
+	win_offset = (*reg - range->range_min) % range->window_len;
+	win_page = (*reg - range->range_min) / range->window_len;
 
-			/* ... or single page boundary */
-			if (val_num > range->window_len - win_offset)
-				return -EINVAL;
-		}
+	if (val_num > 1) {
+		/* Bulk write shouldn't cross range boundary */
+		if (*reg + val_num - 1 > range->range_max)
+			return -EINVAL;
 
-		/* It is possible to have selector register inside data window.
-		   In that case, selector register is located on every page and
-		   it needs no page switching, when accessed alone. */
-		if (val_num > 1 ||
-		    range->window_start + win_offset != range->selector_reg) {
-			/* Use separate work_buf during page switching */
-			orig_work_buf = map->work_buf;
-			map->work_buf = map->selector_work_buf;
+		/* ... or single page boundary */
+		if (val_num > range->window_len - win_offset)
+			return -EINVAL;
+	}
 
-			ret = _regmap_update_bits(map, range->selector_reg,
-					range->selector_mask,
-					win_page << range->selector_shift,
-					&page_chg);
+	/* It is possible to have selector register inside data window.
+	   In that case, selector register is located on every page and
+	   it needs no page switching, when accessed alone. */
+	if (val_num > 1 ||
+	    range->window_start + win_offset != range->selector_reg) {
+		/* Use separate work_buf during page switching */
+		orig_work_buf = map->work_buf;
+		map->work_buf = map->selector_work_buf;
 
-			map->work_buf = orig_work_buf;
+		ret = _regmap_update_bits(map, range->selector_reg,
+					  range->selector_mask,
+					  win_page << range->selector_shift,
+					  &page_chg);
 
-			if (ret < 0)
-				return ret;
-		}
+		map->work_buf = orig_work_buf;
 
-		*reg = range->window_start + win_offset;
+		if (ret != 0)
+			return ret;
 	}
 
+	*reg = range->window_start + win_offset;
+
 	return 0;
 }
 
 static int _regmap_raw_write(struct regmap *map, unsigned int reg,
 			     const void *val, size_t val_len)
 {
+	struct regmap_range_node *range;
 	u8 *u8 = map->work_buf;
 	void *buf;
 	int ret = -ENOTSUPP;
@@ -814,7 +896,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
 					     ival);
 			if (ret) {
 				dev_err(map->dev,
-				   "Error in caching of register: %u ret: %d\n",
+					"Error in caching of register: %x ret: %d\n",
 					reg + i, ret);
 				return ret;
 			}
@@ -825,9 +907,35 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
 		}
 	}
 
-	ret = _regmap_select_page(map, &reg, val_len / map->format.val_bytes);
-	if (ret < 0)
-		return ret;
+	range = _regmap_range_lookup(map, reg);
+	if (range) {
+		int val_num = val_len / map->format.val_bytes;
+		int win_offset = (reg - range->range_min) % range->window_len;
+		int win_residue = range->window_len - win_offset;
+
+		/* If the write goes beyond the end of the window split it */
+		while (val_num > win_residue) {
+			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);
+			if (ret != 0)
+				return ret;
+
+			reg += win_residue;
+			val_num -= win_residue;
+			val += win_residue * map->format.val_bytes;
+			val_len -= win_residue * map->format.val_bytes;
+
+			win_offset = (reg - range->range_min) %
+				range->window_len;
+			win_residue = range->window_len - win_offset;
+		}
+
+		ret = _regmap_select_page(map, &reg, range, val_num);
+		if (ret != 0)
+			return ret;
+	}
 
 	map->format.format_reg(map->work_buf, reg, map->reg_shift);
 
@@ -876,6 +984,7 @@ static int _regmap_raw_write(struct regmap *map, unsigned int reg,
 int _regmap_write(struct regmap *map, unsigned int reg,
 		  unsigned int val)
 {
+	struct regmap_range_node *range;
 	int ret;
 	BUG_ON(!map->format.format_write && !map->format.format_val);
 
@@ -897,9 +1006,12 @@ int _regmap_write(struct regmap *map, unsigned int reg,
 	trace_regmap_reg_write(map->dev, reg, val);
 
 	if (map->format.format_write) {
-		ret = _regmap_select_page(map, &reg, 1);
-		if (ret < 0)
-			return ret;
+		range = _regmap_range_lookup(map, reg);
+		if (range) {
+			ret = _regmap_select_page(map, &reg, range, 1);
+			if (ret != 0)
+				return ret;
+		}
 
 		map->format.format_write(map, reg, val);
 
@@ -939,11 +1051,11 @@ int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
 	if (reg % map->reg_stride)
 		return -EINVAL;
 
-	map->lock(map);
+	map->lock(map->lock_arg);
 
 	ret = _regmap_write(map, reg, val);
 
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 
 	return ret;
 }
@@ -975,11 +1087,11 @@ int regmap_raw_write(struct regmap *map, unsigned int reg,
 	if (reg % map->reg_stride)
 		return -EINVAL;
 
-	map->lock(map);
+	map->lock(map->lock_arg);
 
 	ret = _regmap_raw_write(map, reg, val, val_len);
 
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 
 	return ret;
 }
@@ -1011,7 +1123,7 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
 	if (reg % map->reg_stride)
 		return -EINVAL;
 
-	map->lock(map);
+	map->lock(map->lock_arg);
 
 	/* No formatting is require if val_byte is 1 */
 	if (val_bytes == 1) {
@@ -1047,7 +1159,7 @@ int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
 		kfree(wval);
 
 out:
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(regmap_bulk_write);
@@ -1055,12 +1167,17 @@ EXPORT_SYMBOL_GPL(regmap_bulk_write);
 static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 			    unsigned int val_len)
 {
+	struct regmap_range_node *range;
 	u8 *u8 = map->work_buf;
 	int ret;
 
-	ret = _regmap_select_page(map, &reg, val_len / map->format.val_bytes);
-	if (ret < 0)
-		return ret;
+	range = _regmap_range_lookup(map, reg);
+	if (range) {
+		ret = _regmap_select_page(map, &reg, range,
+					  val_len / map->format.val_bytes);
+		if (ret != 0)
+			return ret;
+	}
 
 	map->format.format_reg(map->work_buf, reg, map->reg_shift);
 
@@ -1137,11 +1254,11 @@ int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
 	if (reg % map->reg_stride)
 		return -EINVAL;
 
-	map->lock(map);
+	map->lock(map->lock_arg);
 
 	ret = _regmap_read(map, reg, val);
 
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 
 	return ret;
 }
@@ -1171,7 +1288,7 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 	if (reg % map->reg_stride)
 		return -EINVAL;
 
-	map->lock(map);
+	map->lock(map->lock_arg);
 
 	if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
 	    map->cache_type == REGCACHE_NONE) {
@@ -1193,7 +1310,7 @@ int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
 	}
 
  out:
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 
 	return ret;
 }
@@ -1300,9 +1417,9 @@ int regmap_update_bits(struct regmap *map, unsigned int reg,
 	bool change;
 	int ret;
 
-	map->lock(map);
+	map->lock(map->lock_arg);
 	ret = _regmap_update_bits(map, reg, mask, val, &change);
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 
 	return ret;
 }
@@ -1326,9 +1443,9 @@ int regmap_update_bits_check(struct regmap *map, unsigned int reg,
 {
 	int ret;
 
-	map->lock(map);
+	map->lock(map->lock_arg);
 	ret = _regmap_update_bits(map, reg, mask, val, change);
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(regmap_update_bits_check);
@@ -1357,7 +1474,7 @@ int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
 	if (map->patch)
 		return -EBUSY;
 
-	map->lock(map);
+	map->lock(map->lock_arg);
 
 	bypass = map->cache_bypass;
 
@@ -1385,7 +1502,7 @@ int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
 out:
 	map->cache_bypass = bypass;
 
-	map->unlock(map);
+	map->unlock(map->lock_arg);
 
 	return ret;
 }

include/linux/regmap.h

@@ -19,6 +19,7 @@
 struct module;
 struct device;
 struct i2c_client;
+struct irq_domain;
 struct spi_device;
 struct regmap;
 struct regmap_range_cfg;
@@ -53,6 +54,39 @@ enum regmap_endian {
 	REGMAP_ENDIAN_NATIVE,
 };
 
+/**
+ * A register range, used for access related checks
+ * (readable/writeable/volatile/precious checks)
+ *
+ * @range_min: address of first register
+ * @range_max: address of last register
+ */
+struct regmap_range {
+	unsigned int range_min;
+	unsigned int range_max;
+};
+
+/*
+ * A table of ranges including some yes ranges and some no ranges.
+ * If a register belongs to a no_range, the corresponding check function
+ * will return false. If a register belongs to a yes range, the corresponding
+ * check function will return true. "no_ranges" are searched first.
+ *
+ * @yes_ranges : pointer to an array of regmap ranges used as "yes ranges"
+ * @n_yes_ranges: size of the above array
+ * @no_ranges: pointer to an array of regmap ranges used as "no ranges"
+ * @n_no_ranges: size of the above array
+ */
+struct regmap_access_table {
+	const struct regmap_range *yes_ranges;
+	unsigned int n_yes_ranges;
+	const struct regmap_range *no_ranges;
+	unsigned int n_no_ranges;
+};
+
+typedef void (*regmap_lock)(void *);
+typedef void (*regmap_unlock)(void *);
+
 /**
  * Configuration for the register map of a device.
  *
@@ -67,16 +101,39 @@ enum regmap_endian {
  * @val_bits: Number of bits in a register value, mandatory.
  *
  * @writeable_reg: Optional callback returning true if the register
- *                 can be written to.
+ *		   can be written to. If this field is NULL but wr_table
+ *		   (see below) is not, the check is performed on such table
+ *                 (a register is writeable if it belongs to one of the ranges
+ *                  specified by wr_table).
  * @readable_reg: Optional callback returning true if the register
- *                can be read from.
+ *		  can be read from. If this field is NULL but rd_table
+ *		   (see below) is not, the check is performed on such table
+ *                 (a register is readable if it belongs to one of the ranges
+ *                  specified by rd_table).
  * @volatile_reg: Optional callback returning true if the register
- *                value can't be cached.
+ *		  value can't be cached. If this field is NULL but
+ *		  volatile_table (see below) is not, the check is performed on
+ *                such table (a register is volatile if it belongs to one of
+ *                the ranges specified by volatile_table).
  * @precious_reg: Optional callback returning true if the rgister
- *                should not be read outside of a call from the driver
- *                (eg, a clear on read interrupt status register).
+ *		  should not be read outside of a call from the driver
+ *		  (eg, a clear on read interrupt status register). If this
+ *                field is NULL but precious_table (see below) is not, the
+ *                check is performed on such table (a register is precious if
+ *                it belongs to one of the ranges specified by precious_table).
+ * @lock:	  Optional lock callback (overrides regmap's default lock
+ *		  function, based on spinlock or mutex).
+ * @unlock:	  As above for unlocking.
+ * @lock_arg:	  this field is passed as the only argument of lock/unlock
+ *		  functions (ignored in case regular lock/unlock functions
+ *		  are not overridden).
  *
  * @max_register: Optional, specifies the maximum valid register index.
+ * @wr_table:     Optional, points to a struct regmap_access_table specifying
+ *                valid ranges for write access.
+ * @rd_table:     As above, for read access.
+ * @volatile_table: As above, for volatile registers.
+ * @precious_table: As above, for precious registers.
  * @reg_defaults: Power on reset values for registers (for use with
  *                register cache support).
  * @num_reg_defaults: Number of elements in reg_defaults.
@@ -116,8 +173,15 @@ struct regmap_config {
 	bool (*readable_reg)(struct device *dev, unsigned int reg);
 	bool (*volatile_reg)(struct device *dev, unsigned int reg);
 	bool (*precious_reg)(struct device *dev, unsigned int reg);
+	regmap_lock lock;
+	regmap_unlock unlock;
+	void *lock_arg;
 
 	unsigned int max_register;
+	const struct regmap_access_table *wr_table;
+	const struct regmap_access_table *rd_table;
+	const struct regmap_access_table *volatile_table;
+	const struct regmap_access_table *precious_table;
 	const struct reg_default *reg_defaults;
 	unsigned int num_reg_defaults;
 	enum regcache_type cache_type;
@@ -133,7 +197,7 @@ struct regmap_config {
 	enum regmap_endian val_format_endian;
 
 	const struct regmap_range_cfg *ranges;
-	unsigned int n_ranges;
+	unsigned int num_ranges;
 };
 
 /**
@@ -142,6 +206,8 @@ struct regmap_config {
  *     1. page selector register update;
  *     2. access through data window registers.
  *
+ * @name: Descriptive name for diagnostics
+ *
  * @range_min: Address of the lowest register address in virtual range.
  * @range_max: Address of the highest register in virtual range.
  *
@@ -153,6 +219,8 @@ struct regmap_config {
  * @window_len: Number of registers in data window.
  */
 struct regmap_range_cfg {
+	const char *name;
+
 	/* Registers of virtual address range */
 	unsigned int range_min;
 	unsigned int range_max;
@@ -181,7 +249,9 @@ 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.
+ *	     to perform locking. This field is ignored if custom lock/unlock
+ *	     functions are used (see fields lock/unlock of
+ *	     struct regmap_config).
  * @write: Write operation.
  * @gather_write: Write operation with split register/value, return -ENOTSUPP
  *                if not implemented  on a given device.
@@ -262,6 +332,16 @@ void regcache_mark_dirty(struct regmap *map);
 int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
 			  int num_regs);
 
+static inline bool regmap_reg_in_range(unsigned int reg,
+				       const struct regmap_range *range)
+{
+	return reg >= range->range_min && reg <= range->range_max;
+}
+
+bool regmap_reg_in_ranges(unsigned int reg,
+			  const struct regmap_range *ranges,
+			  unsigned int nranges);
+
 /**
  * Description of an IRQ for the generic regmap irq_chip.
  *
@@ -317,6 +397,7 @@ int regmap_add_irq_chip(struct regmap *map, int irq, int irq_flags,
 void regmap_del_irq_chip(int irq, struct regmap_irq_chip_data *data);
 int regmap_irq_chip_get_base(struct regmap_irq_chip_data *data);
 int regmap_irq_get_virq(struct regmap_irq_chip_data *data, int irq);
+struct irq_domain *regmap_irq_get_domain(struct regmap_irq_chip_data *data);
 
 #else