nvmem: sunxi_sid: Read out data in native format

Originally the SID e-fuses were thought to be in big-endian format.
Later sources show that they are in fact native or little-endian.
The most compelling evidence is the thermal sensor calibration data,
which is a set of one to three 16-bit values. In native-endian they
are in 16-bit cells with increasing offsets, whereas with big-endian
they are in the wrong order, and a gap with no data will show if there
are one or three cells.

Switch to a native endian representation for the nvmem device. For the
H3, the register read-out method was already returning data in native
endian. This only affects the other SoCs.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/nvmem/sunxi_sid.c b/drivers/nvmem/sunxi_sid.c
index 75c1f48cb3d0fbac545aa31945d6c006947be5b6..14c114620ed696c34f1bd242d0f82e08eba931dd 100644 (file)
--- a/drivers/nvmem/sunxi_sid.c
+++ b/drivers/nvmem/sunxi_sid.c
@@ -46,33 +46,12 @@ struct sunxi_sid {
        u32                     value_offset;
 };
 
-/* We read the entire key, due to a 32 bit read alignment requirement. Since we
- * want to return the requested byte, this results in somewhat slower code and
- * uses 4 times more reads as needed but keeps code simpler. Since the SID is
- * only very rarely probed, this is not really an issue.
- */
-static u8 sunxi_sid_read_byte(const struct sunxi_sid *sid,
-                             const unsigned int offset)
-{
-       u32 sid_key;
-
-       sid_key = ioread32be(sid->base + round_down(offset, 4));
-       sid_key >>= (offset % 4) * 8;
-
-       return sid_key; /* Only return the last byte */
-}
-
 static int sunxi_sid_read(void *context, unsigned int offset,
                          void *val, size_t bytes)
 {
        struct sunxi_sid *sid = context;
-       u8 *buf = val;
-
-       /* Offset the read operation to the real position of SID */
-       offset += sid->value_offset;
 
-       while (bytes--)
-               *buf++ = sunxi_sid_read_byte(sid, offset++);
+       memcpy_fromio(val, sid->base + sid->value_offset + offset, bytes);
 
        return 0;
 }