1 files changed, 72 insertions, 0 deletions
diff --git a/include/regmap.h b/include/regmap.h
new file mode 100644
index 0000000000..eccf7707f4
--- /dev/null
+++ b/include/regmap.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __REGMAP_H
+#define __REGMAP_H
+
+/**
+ * struct regmap_range - a register map range
+ *
+ * @start:	Start address
+ * @size:	Size in bytes
+ */
+struct regmap_range {
+	ulong start;
+	ulong size;
+};
+
+/**
+ * struct regmap - a way of accessing hardware/bus registers
+ *
+ * @base:	Base address of register map
+ * @range_count: Number of ranges available within the map
+ * @range:	Pointer to the list of ranges, allocated if @range_count > 1
+ * @base_range:	If @range_count is <= 1, @range points here
+ */
+struct regmap {
+	phys_addr_t base;
+	int range_count;
+	struct regmap_range *range, base_range;
+};
+
+/*
+ * Interface to provide access to registers either through a direct memory
+ * bus or through a peripheral bus like I2C, SPI.
+ */
+int regmap_write(struct regmap *map, uint offset, uint val);
+int regmap_read(struct regmap *map, uint offset, uint *valp);
+
+#define regmap_write32(map, ptr, member, val) \
+	regmap_write(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), val)
+
+#define regmap_read32(map, ptr, member, valp) \
+	regmap_read(map, (uint32_t *)(ptr)->member - (uint32_t *)(ptr), valp)
+
+/**
+ * regmap_init_mem() - Set up a new register map that uses memory access
+ *
+ * Use regmap_uninit() to free it.
+ *
+ * @dev:	Device that uses this map
+ * @mapp:	Returns allocated map
+ */
+int regmap_init_mem(struct udevice *dev, struct regmap **mapp);
+
+/**
+ * regmap_get_range() - Obtain the base memory address of a regmap range
+ *
+ * @map:	Regmap to query
+ * @range_num:	Range to look up
+ */
+void *regmap_get_range(struct regmap *map, unsigned int range_num);
+
+/**
+ * regmap_uninit() - free a previously inited regmap
+ */
+int regmap_uninit(struct regmap *map);
+
+#endif