regmap: allow busses to request formatting with specific endianness

Add a field to struct regmap_bus that allows bus drivers to request that
register addresses and values be formatted with a specific endianness.

The default endianness is unchanged from current operation: Big.

Implement native endian formatting/parsing for 16- and 32-bit values.
This will be enough to support regmap-mmio.c.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 90 insertions, 11 deletions

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 0bcda488f11..1cf721421be 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -119,13 +119,19 @@ static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
 	b[0] = val << shift;
 }
 
-static void regmap_format_16(void *buf, unsigned int val, unsigned int shift)
+static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift)
 {
 	__be16 *b = buf;
 
 	b[0] = cpu_to_be16(val << shift);
 }
 
+static void regmap_format_16_native(void *buf, unsigned int val,
+				    unsigned int shift)
+{
+	*(u16 *)buf = val << shift;
+}
+
 static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
 {
 	u8 *b = buf;
@@ -137,13 +143,19 @@ static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
 	b[2] = val;
 }
 
-static void regmap_format_32(void *buf, unsigned int val, unsigned int shift)
+static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
 {
 	__be32 *b = buf;
 
 	b[0] = cpu_to_be32(val << shift);
 }
 
+static void regmap_format_32_native(void *buf, unsigned int val,
+				    unsigned int shift)
+{
+	*(u32 *)buf = val << shift;
+}
+
 static unsigned int regmap_parse_8(void *buf)
 {
 	u8 *b = buf;
@@ -151,7 +163,7 @@ static unsigned int regmap_parse_8(void *buf)
 	return b[0];
 }
 
-static unsigned int regmap_parse_16(void *buf)
+static unsigned int regmap_parse_16_be(void *buf)
 {
 	__be16 *b = buf;
 
@@ -160,6 +172,11 @@ static unsigned int regmap_parse_16(void *buf)
 	return b[0];
 }
 
+static unsigned int regmap_parse_16_native(void *buf)
+{
+	return *(u16 *)buf;
+}
+
 static unsigned int regmap_parse_24(void *buf)
 {
 	u8 *b = buf;
@@ -170,7 +187,7 @@ static unsigned int regmap_parse_24(void *buf)
 	return ret;
 }
 
-static unsigned int regmap_parse_32(void *buf)
+static unsigned int regmap_parse_32_be(void *buf)
 {
 	__be32 *b = buf;
 
@@ -179,6 +196,11 @@ static unsigned int regmap_parse_32(void *buf)
 	return b[0];
 }
 
+static unsigned int regmap_parse_32_native(void *buf)
+{
+	return *(u32 *)buf;
+}
+
 static void regmap_lock_mutex(struct regmap *map)
 {
 	mutex_lock(&map->mutex);
@@ -227,6 +249,7 @@ struct regmap *regmap_init(struct device *dev,
 {
 	struct regmap *map, **m;
 	int ret = -EINVAL;
+	enum regmap_endian reg_endian, val_endian;
 
 	if (!bus || !config)
 		goto err;
@@ -275,6 +298,18 @@ struct regmap *regmap_init(struct device *dev,
 		map->read_flag_mask = bus->read_flag_mask;
 	}
 
+	reg_endian = config->reg_format_endian;
+	if (reg_endian == REGMAP_ENDIAN_DEFAULT)
+		reg_endian = bus->reg_format_endian_default;
+	if (reg_endian == REGMAP_ENDIAN_DEFAULT)
+		reg_endian = REGMAP_ENDIAN_BIG;
+
+	val_endian = config->val_format_endian;
+	if (val_endian == REGMAP_ENDIAN_DEFAULT)
+		val_endian = bus->val_format_endian_default;
+	if (val_endian == REGMAP_ENDIAN_DEFAULT)
+		val_endian = REGMAP_ENDIAN_BIG;
+
 	switch (config->reg_bits + map->reg_shift) {
 	case 2:
 		switch (config->val_bits) {
@@ -321,11 +356,29 @@ struct regmap *regmap_init(struct device *dev,
 		break;
 
 	case 16:
-		map->format.format_reg = regmap_format_16;
+		switch (reg_endian) {
+		case REGMAP_ENDIAN_BIG:
+			map->format.format_reg = regmap_format_16_be;
+			break;
+		case REGMAP_ENDIAN_NATIVE:
+			map->format.format_reg = regmap_format_16_native;
+			break;
+		default:
+			goto err_map;
+		}
 		break;
 
 	case 32:
-		map->format.format_reg = regmap_format_32;
+		switch (reg_endian) {
+		case REGMAP_ENDIAN_BIG:
+			map->format.format_reg = regmap_format_32_be;
+			break;
+		case REGMAP_ENDIAN_NATIVE:
+			map->format.format_reg = regmap_format_32_native;
+			break;
+		default:
+			goto err_map;
+		}
 		break;
 
 	default:
@@ -338,21 +391,47 @@ struct regmap *regmap_init(struct device *dev,
 		map->format.parse_val = regmap_parse_8;
 		break;
 	case 16:
-		map->format.format_val = regmap_format_16;
-		map->format.parse_val = regmap_parse_16;
+		switch (val_endian) {
+		case REGMAP_ENDIAN_BIG:
+			map->format.format_val = regmap_format_16_be;
+			map->format.parse_val = regmap_parse_16_be;
+			break;
+		case REGMAP_ENDIAN_NATIVE:
+			map->format.format_val = regmap_format_16_native;
+			map->format.parse_val = regmap_parse_16_native;
+			break;
+		default:
+			goto err_map;
+		}
 		break;
 	case 24:
+		if (val_endian != REGMAP_ENDIAN_BIG)
+			goto err_map;
 		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;
+		switch (val_endian) {
+		case REGMAP_ENDIAN_BIG:
+			map->format.format_val = regmap_format_32_be;
+			map->format.parse_val = regmap_parse_32_be;
+			break;
+		case REGMAP_ENDIAN_NATIVE:
+			map->format.format_val = regmap_format_32_native;
+			map->format.parse_val = regmap_parse_32_native;
+			break;
+		default:
+			goto err_map;
+		}
 		break;
 	}
 
-	if (map->format.format_write)
+	if (map->format.format_write) {
+		if ((reg_endian != REGMAP_ENDIAN_BIG) ||
+		    (val_endian != REGMAP_ENDIAN_BIG))
+			goto err_map;
 		map->use_single_rw = true;
+	}
 
 	if (!map->format.format_write &&
 	    !(map->format.format_reg && map->format.format_val))