rockchip: board: puma_rk3399: add support for serial# and cpuid# via efuses
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@theobroma-systems.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/board/theobroma-systems/puma_rk3399/puma-rk3399.c b/board/theobroma-systems/puma_rk3399/puma-rk3399.c
index 0a8861a..ea6d256 100644
--- a/board/theobroma-systems/puma_rk3399/puma-rk3399.c
+++ b/board/theobroma-systems/puma_rk3399/puma-rk3399.c
@@ -9,10 +9,15 @@
#include <ram.h>
#include <dm/pinctrl.h>
#include <dm/uclass-internal.h>
+#include <misc.h>
+#include <asm/setup.h>
#include <asm/arch/periph.h>
#include <power/regulator.h>
#include <u-boot/sha256.h>
+#define RK3399_CPUID_OFF 0x7
+#define RK3399_CPUID_LEN 0x10
+
DECLARE_GLOBAL_DATA_PTR;
#define RK3399_CPUID_OFF 0x7
@@ -63,6 +68,81 @@
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;