regmap: Add raw read/write functions

The regmap functions currently assume that all register map accesses
have a data width of 32 bits, but there are maps that have different
widths.

To rectify this, implement the regmap_raw_read and regmap_raw_write
functions from the Linux kernel API that specify the width of a desired
read or write operation on a regmap.

Implement the regmap_read and regmap_write functions using these raw
functions in a backwards-compatible manner.

Reviewed-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Mario Six <mario.six@gdsys.cc>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 57 insertions, 7 deletions

diff --git a/drivers/core/regmap.c b/drivers/core/regmap.c
index 154426269d9..916d9272ea0 100644
--- a/drivers/core/regmap.c
+++ b/drivers/core/regmap.c
@@ -188,22 +188,72 @@ int regmap_uninit(struct regmap *map)
 	return 0;
 }
 
+int regmap_raw_read(struct regmap *map, uint offset, void *valp, size_t val_len)
+{
+	void *ptr;
+
+	ptr = map_physmem(map->ranges[0].start + offset, val_len, MAP_NOCACHE);
+
+	switch (val_len) {
+	case REGMAP_SIZE_8:
+		*((u8 *)valp) = readb((u8 *)ptr);
+		break;
+	case REGMAP_SIZE_16:
+		*((u16 *)valp) = readw((u16 *)ptr);
+		break;
+	case REGMAP_SIZE_32:
+		*((u32 *)valp) = readl((u32 *)ptr);
+		break;
+#if defined(readq)
+	case REGMAP_SIZE_64:
+		*((u64 *)valp) = readq((u64 *)ptr);
+		break;
+#endif
+	default:
+		debug("%s: regmap size %zu unknown\n", __func__, val_len);
+		return -EINVAL;
+	}
+	return 0;
+}
+
 int regmap_read(struct regmap *map, uint offset, uint *valp)
 {
-	u32 *ptr = map_physmem(map->ranges[0].start + offset, 4, MAP_NOCACHE);
+	return regmap_raw_read(map, offset, valp, REGMAP_SIZE_32);
+}
 
-	*valp = le32_to_cpu(readl(ptr));
+int regmap_raw_write(struct regmap *map, uint offset, const void *val,
+		     size_t val_len)
+{
+	void *ptr;
+
+	ptr = map_physmem(map->ranges[0].start + offset, val_len, MAP_NOCACHE);
+
+	switch (val_len) {
+	case REGMAP_SIZE_8:
+		writeb(*((u8 *)val), (u8 *)ptr);
+		break;
+	case REGMAP_SIZE_16:
+		writew(*((u16 *)val), (u16 *)ptr);
+		break;
+	case REGMAP_SIZE_32:
+		writel(*((u32 *)val), (u32 *)ptr);
+		break;
+#if defined(writeq)
+	case REGMAP_SIZE_64:
+		writeq(*((u64 *)val), (u64 *)ptr);
+		break;
+#endif
+	default:
+		debug("%s: regmap size %zu unknown\n", __func__, val_len);
+		return -EINVAL;
+	}
 
 	return 0;
 }
 
 int regmap_write(struct regmap *map, uint offset, uint val)
 {
-	u32 *ptr = map_physmem(map->ranges[0].start + offset, 4, MAP_NOCACHE);
-
-	writel(cpu_to_le32(val), ptr);
-
-	return 0;
+	return regmap_raw_write(map, offset, &val, REGMAP_SIZE_32);
 }
 
 int regmap_update_bits(struct regmap *map, uint offset, uint mask, uint val)