1 files changed, 72 insertions, 0 deletions

diff --git a/drivers/base/regmap/regcache-flat.c b/drivers/base/regmap/regcache-flat.c
new file mode 100644
index 000000000000..d9762e41959b
--- /dev/null
+++ b/drivers/base/regmap/regcache-flat.c
@@ -0,0 +1,72 @@
+/*
+ * Register cache access API - flat caching support
+ *
+ * Copyright 2012 Wolfson Microelectronics plc
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/slab.h>
+#include <linux/device.h>
+#include <linux/seq_file.h>
+
+#include "internal.h"
+
+static int regcache_flat_init(struct regmap *map)
+{
+        int i;
+        unsigned int *cache;
+
+        map->cache = kzalloc(sizeof(unsigned int) * (map->max_register + 1),
+                             GFP_KERNEL);
+        if (!map->cache)
+                return -ENOMEM;
+
+        cache = map->cache;
+
+        for (i = 0; i < map->num_reg_defaults; i++)
+                cache[map->reg_defaults[i].reg] = map->reg_defaults[i].def;
+
+        return 0;
+}
+
+static int regcache_flat_exit(struct regmap *map)
+{
+        kfree(map->cache);
+        map->cache = NULL;
+
+        return 0;
+}
+
+static int regcache_flat_read(struct regmap *map,
+                              unsigned int reg, unsigned int *value)
+{
+        unsigned int *cache = map->cache;
+
+        *value = cache[reg];
+
+        return 0;
+}
+
+static int regcache_flat_write(struct regmap *map, unsigned int reg,
+                               unsigned int value)
+{
+        unsigned int *cache = map->cache;
+
+        cache[reg] = value;
+
+        return 0;
+}
+
+struct regcache_ops regcache_flat_ops = {
+        .type = REGCACHE_FLAT,
+        .name = "flat",
+        .init = regcache_flat_init,
+        .exit = regcache_flat_exit,
+        .read = regcache_flat_read,
+        .write = regcache_flat_write,
+};