[PATCH] rockchip: rk3399: add ethaddr and serial# init, enable for R4S

[Christian Kohlschütter]

Some RK3399 boards, such as newer revisions of NanoPi R4S, do not
provide an EEPROM chip containing a globally unique MAC address.

Currently, this means that a randomly generated temporary MAC address
may be generated each time the device is rebooted, leading to ARP cache
issues and other confusing bugs.

Since RK3399 CPUs provide a built-in unique serial number, we can
reliably derive a locally MAC address from it by reading the
corresponding bits from the non-secure efuse block.

Port from uboot-rockchip 0c294d0, fix compilation issues and adjust
coding style.

rockchip: board: puma_rk3399: derive ethaddr from cpuid
rockchip: board: puma_rk3399: add support for serial# and cpuid#
rockchip: efuse: add (misc) driver for RK3399 non-secure efuse block
via efuses

Signed-off-by: Christian Kohlschütter <christian at kohlschutter.com>
---
 board/rockchip/evb_rk3399/evb-rk3399.c | 120 +++++++++++++++++++++++++
 configs/nanopi-r4s-rk3399_defconfig    |   4 +
 drivers/misc/Makefile                  |   2 +-
 3 files changed, 125 insertions(+), 1 deletion(-)

diff --git a/board/rockchip/evb_rk3399/evb-rk3399.c b/board/rockchip/evb_rk3399/evb-rk3399.c
index abb76585cf..ab8738ccf3 100644
--- a/board/rockchip/evb_rk3399/evb-rk3399.c
+++ b/board/rockchip/evb_rk3399/evb-rk3399.c
@@ -5,11 +5,20 @@
 
 #include <common.h>
 #include <dm.h>
+#include <misc.h>
+#include <env.h>
+#include <u-boot/crc.h>
+#include <hash.h>
 #include <init.h>
 #include <log.h>
 #include <asm/arch-rockchip/periph.h>
+#include <asm/setup.h>
+#include <u-boot/sha256.h>
 #include <power/regulator.h>
 
+#define RK3399_CPUID_OFF  0x7
+#define RK3399_CPUID_LEN  0x10
+
 #ifndef CONFIG_SPL_BUILD
 int board_early_init_f(void)
 {
@@ -30,3 +39,114 @@ out:
 	return 0;
 }
 #endif
+static void setup_macaddr(void)
+{
+	if (!IS_ENABLED(CONFIG_CMD_NET))
+		return;
+
+	int ret;
+	const char *cpuid = env_get("cpuid#");
+	u8 hash[SHA256_SUM_LEN];
+	int size = sizeof(hash);
+	u8 mac_addr[6];
+
+	/* Only generate a MAC address if none is set in the environment */
+	if (env_get("ethaddr"))
+		return;
+
+	if (!cpuid) {
+		debug("%s: could not retrieve 'cpuid#'\n", __func__);
+		return;
+	}
+
+	ret = hash_block("sha256", (void *)cpuid, strlen(cpuid), hash, &size);
+	if (ret) {
+		debug("%s: failed to calculate SHA256\n", __func__);
+		return;
+	}
+
+	/* Copy 6 bytes of the hash to base the MAC address on */
+	memcpy(mac_addr, hash, 6);
+
+	/* Make this a valid MAC address and set it */
+	mac_addr[0] &= 0xfe;  /* clear multicast bit */
+	mac_addr[0] |= 0x02;  /* set local assignment bit (IEEE802) */
+	eth_env_set_enetaddr("ethaddr", mac_addr);
+}
+
+static void setup_serial(void)
+{
+	if (!IS_ENABLED(CONFIG_ROCKCHIP_EFUSE))
+		return;
+
+	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];
+
+	/* retrieve the device */
+	ret = uclass_get_device_by_driver(UCLASS_MISC,
+					  DM_DRIVER_GET(rockchip_efuse), &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
+	 *   ${linux}/drivers/soc/rockchip/rockchip-cpuinfo.c
+	 */
+	for (i = 0; i < 8; i++) {
+		low[i] = cpuid[1 + (i << 1)];
+		high[i] = cpuid[i << 1];
+	}
+
+	serialno = crc32_no_comp(0, low, 8);
+	serialno |= (u64)crc32_no_comp(serialno, high, 8) << 32;
+	snprintf(serialno_str, sizeof(serialno_str), "%llx", serialno);
+
+	env_set("cpuid#", cpuid_str);
+	env_set("serial#", serialno_str);
+}
+
+int misc_init_r(void)
+{
+	setup_serial();
+	setup_macaddr();
+
+	return 0;
+}
+
+void get_board_serial(struct tag_serialnr *serialnr)
+{
+	u64 serial = 0;
+
+	if (IS_ENABLED(CONFIG_SERIAL_TAG)) {
+		char *serial_string;
+
+		serial_string = env_get("serial#");
+
+		if (serial_string)
+			serial = simple_strtoull(serial_string, NULL, 16);
+	}
+
+	serialnr->high = (u32)(serial >> 32);
+	serialnr->low = (u32)(serial & 0xffffffff);
+}
diff --git a/configs/nanopi-r4s-rk3399_defconfig b/configs/nanopi-r4s-rk3399_defconfig
index 46ba07f4d5..aa89ac5854 100644
--- a/configs/nanopi-r4s-rk3399_defconfig
+++ b/configs/nanopi-r4s-rk3399_defconfig
@@ -63,3 +63,7 @@ CONFIG_VIDEO_ROCKCHIP=y
 CONFIG_DISPLAY_ROCKCHIP_HDMI=y
 CONFIG_SPL_TINY_MEMSET=y
 CONFIG_ERRNO_STR=y
+CONFIG_MISC=y
+CONFIG_MISC_INIT_R=y
+CONFIG_ROCKCHIP_EFUSE=y
+CONFIG_ROCKCHIP_OTP=y
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index b9c54bdd99..a2ce9e737c 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -64,7 +64,7 @@ obj-$(CONFIG_QFW_PIO) += qfw_pio.o
 obj-$(CONFIG_QFW_MMIO) += qfw_mmio.o
 obj-$(CONFIG_SANDBOX) += qfw_sandbox.o
 endif
-obj-$(CONFIG_ROCKCHIP_EFUSE) += rockchip-efuse.o
+obj-$(CONFIG_ROCKCHIP_EFUSE) += rockchip-efuse.o misc-uclass.o
 obj-$(CONFIG_ROCKCHIP_OTP) += rockchip-otp.o
 obj-$(CONFIG_SANDBOX) += syscon_sandbox.o misc_sandbox.o
 obj-$(CONFIG_SIFIVE_OTP) += sifive-otp.o
-- 
2.36.2