[U-Boot] [PATCH v3 2/4] rockchip: board: puma_rk3399: add support for serial# and cpuid# via efuses

[Philipp Tomsich]

With our efuse driver for the RK3399 ready, we can add the
board-specific code that consumes the cpuid from the efuse block and
postprocesses it into the system serial (using the same CRC32 based
derivation as in Linux).

We expose the cpuid via two distinct environment variables:
   serial# - the serial number, as derived in Linux
   cpuid#  - the raw 16 byte CPU id field from the fuse block

Signed-off-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
---

Changes in v3: None
Changes in v2: None

 board/theobroma-systems/puma_rk3399/puma-rk3399.c | 79 +++++++++++++++++++++++
 include/configs/puma_rk3399.h                     |  6 ++
 2 files changed, 85 insertions(+)

diff --git a/board/theobroma-systems/puma_rk3399/puma-rk3399.c b/board/theobroma-systems/puma_rk3399/puma-rk3399.c
index 6231369..72719f3 100644
--- a/board/theobroma-systems/puma_rk3399/puma-rk3399.c
+++ b/board/theobroma-systems/puma_rk3399/puma-rk3399.c
@@ -9,6 +9,7 @@
 #include <ram.h>
 #include <dm/pinctrl.h>
 #include <dm/uclass-internal.h>
+#include <misc.h>
 #include <asm/arch/periph.h>
 #include <power/regulator.h>
 #include <u-boot/sha256.h>
@@ -16,6 +17,9 @@
 #include <usb.h>
 #include <dwc3-uboot.h>
 
+#define RK3399_CPUID_OFF  0x7
+#define RK3399_CPUID_LEN  0x10
+
 DECLARE_GLOBAL_DATA_PTR;
 
 #define RK3399_CPUID_OFF  0x7
@@ -66,6 +70,81 @@ out:
 	return 0;
 }
 
+static void setup_serial(void)
+{
+#if CONFIG_IS_ENABLED(ROCKCHIP_EFUSE)
+	struct udevice *dev;
+	int ret, i;
+	u8 cpuid[RK3399_CPUID_LEN];
+	u8 low[RK3399_CPUID_LEN/2], high[RK3399_CPUID_LEN/2];
+	char cpuid_str[RK3399_CPUID_LEN * 2 + 1];
+	u64 serialno;
+	char serialno_str[16];
+
+	/* the first misc device will be used */
+	ret = uclass_get_device(UCLASS_MISC, 0, &dev);
+	if (ret) {
+		debug("%s: could not find efuse device\n", __func__);
+		return;
+	}
+
+	/* read the cpu_id range from the efuses */
+	ret = misc_read(dev, RK3399_CPUID_OFF, &cpuid, sizeof(cpuid));
+	if (ret) {
+		debug("%s: reading cpuid from the efuses failed\n",
+		      __func__);
+		return;
+	}
+
+	memset(cpuid_str, 0, sizeof(cpuid_str));
+	for (i = 0; i < 16; i++)
+		sprintf(&cpuid_str[i * 2], "%02x", cpuid[i]);
+
+	debug("cpuid: %s\n", cpuid_str);
+
+	/*
+	 * Mix the cpuid bytes using the same rules as in
+	 *   ${linux}/drivers/soc/rockchip/rockchip-cpuinfo.c
+	 */
+	for (i = 0; i < 8; i++) {
+		low[i] = cpuid[1 + (i << 1)];
+		high[i] = cpuid[i << 1];
+	}
+
+	serialno = crc32_no_comp(0, low, 8);
+	serialno |= (u64)crc32_no_comp(serialno, high, 8) << 32;
+	snprintf(serialno_str, sizeof(serialno_str), "%llx", serialno);
+
+	setenv("cpuid#", cpuid_str);
+	setenv("serial#", serialno_str);
+#endif
+
+	return;
+}
+
+int misc_init_r(void)
+{
+	setup_serial();
+
+	return 0;
+}
+
+#ifdef CONFIG_SERIAL_TAG
+void get_board_serial(struct tag_serialnr *serialnr)
+{
+	char *serial_string;
+	u64 serial = 0;
+
+	serial_string = getenv("serial#");
+
+	if (serial_string)
+		serial = simple_strtoull(serial_string, NULL, 16);
+
+	serialnr->high = (u32)(serial >> 32);
+	serialnr->low = (u32)(serial & 0xffffffff);
+}
+#endif
+
 int dram_init(void)
 {
 	struct ram_info ram;
diff --git a/include/configs/puma_rk3399.h b/include/configs/puma_rk3399.h
index f778744..4081362 100644
--- a/include/configs/puma_rk3399.h
+++ b/include/configs/puma_rk3399.h
@@ -22,4 +22,10 @@
 
 #define SDRAM_BANK_SIZE			(2UL << 30)
 
+#define CONFIG_MISC_INIT_R
+#define CONFIG_SERIAL_TAG
+#define CONFIG_ENV_OVERWRITE
+
+#define CONFIG_SYS_WHITE_ON_BLACK
+
 #endif
-- 
1.9.1