snapdragon: added msm_board_serial() func
This commit adds a function to get the board
serial number.
In snapdragon it's actually the eMMC serial number.
Function added in a new file misc.c that will
include further snapdragon miscellaneous functions.
Signed-off-by: Ramon Fried <ramon.fried@gmail.com>
diff --git a/arch/arm/mach-snapdragon/misc.c b/arch/arm/mach-snapdragon/misc.c
new file mode 100644
index 0000000..678bd69
--- /dev/null
+++ b/arch/arm/mach-snapdragon/misc.c
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Miscellaneous Snapdragon functionality
+ *
+ * (C) Copyright 2018 Ramon Fried <ramon.fried@gmail.com>
+ *
+ */
+
+#include <common.h>
+#include <mmc.h>
+#include <asm/arch/misc.h>
+
+/* UNSTUFF_BITS macro taken from Linux Kernel: drivers/mmc/core/sd.c */
+#define UNSTUFF_BITS(resp, start, size) \
+ ({ \
+ const int __size = size; \
+ const u32 __mask = (__size < 32 ? 1 << __size : 0) - 1; \
+ const int __off = 3 - ((start) / 32); \
+ const int __shft = (start) & 31; \
+ u32 __res; \
+ \
+ __res = resp[__off] >> __shft; \
+ if (__size + __shft > 32) \
+ __res |= resp[__off - 1] << ((32 - __shft) % 32); \
+ __res & __mask; \
+ })
+
+u32 msm_board_serial(void)
+{
+ struct mmc *mmc_dev;
+
+ mmc_dev = find_mmc_device(0);
+ if (!mmc_dev)
+ return 0;
+
+ return UNSTUFF_BITS(mmc_dev->cid, 16, 32);
+}