[U-Boot] [PATCH v2 1/3] rockchip: rk3399: derive ethaddr from cpuid

[Rohan Garg <rohan.garg@collabora.com>]

Generate a MAC address based on the cpuid available in the efuse
block: Use the first 6 byte of the cpuid's SHA256 hash and set the
locally administered bits. Also ensure that the multicast bit is
cleared.

The MAC address is only generated and set if there is no ethaddr
present in the saved environment.

This is based off of Klaus Goger's work in 8adc9d

Signed-off-by: Rohan Garg <rohan.garg@collabora.com>

---

 arch/arm/include/asm/arch-rockchip/misc.h |  13 +++
 arch/arm/mach-rockchip/Makefile           |   2 +
 arch/arm/mach-rockchip/misc.c             | 108 ++++++++++++++++++++++
 board/rockchip/evb_rk3399/evb-rk3399.c    |  13 +++
 4 files changed, 136 insertions(+)
 create mode 100644 arch/arm/include/asm/arch-rockchip/misc.h
 create mode 100644 arch/arm/mach-rockchip/misc.c

diff --git a/arch/arm/include/asm/arch-rockchip/misc.h b/arch/arm/include/asm/arch-rockchip/misc.h
new file mode 100644
index 0000000000..11ca4eb033
--- /dev/null
+++ b/arch/arm/include/asm/arch-rockchip/misc.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * RK3399: Architecture common definitions
+ *
+ * Copyright (C) 2019 Collabora Inc - https://www.collabora.com/
+ *      Rohan Garg <rohan.garg@collabora.com>
+ */
+
+void rockchip_cpuid_from_efuse(const u32 cpuid_offset,
+							   const u32 cpuid_length,
+							   u8 *cpuid);
+void rockchip_cpuid_set(const u8 *cpuid, const u32 cpuid_length);
+void rockchip_setup_macaddr(void);
diff --git a/arch/arm/mach-rockchip/Makefile b/arch/arm/mach-rockchip/Makefile
index 23760a959a..43d895564f 100644
--- a/arch/arm/mach-rockchip/Makefile
+++ b/arch/arm/mach-rockchip/Makefile
@@ -47,6 +47,8 @@ obj-y += rk_timer.o
 endif
 endif
 
+obj-y += misc.o
+
 obj-$(CONFIG_ROCKCHIP_RK3036) += rk3036/
 obj-$(CONFIG_ROCKCHIP_RK3128) += rk3128/
 ifndef CONFIG_TPL_BUILD
diff --git a/arch/arm/mach-rockchip/misc.c b/arch/arm/mach-rockchip/misc.c
new file mode 100644
index 0000000000..3e6110cc8b
--- /dev/null
+++ b/arch/arm/mach-rockchip/misc.c
@@ -0,0 +1,108 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * RK3399: Architecture common definitions
+ *
+ * Copyright (C) 2019 Collabora Inc - https://www.collabora.com/
+ *      Rohan Garg <rohan.garg@collabora.com>
+ *
+ * Based on puma-rk3399.c:
+ *      (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
+ */
+
+#include <common.h>
+#include <u-boot/sha256.h>
+#include <dm/uclass-internal.h>
+#include <environment.h>
+
+#include <asm/arch-rockchip/misc.h>
+
+void rockchip_setup_macaddr(void)
+{
+#if CONFIG_IS_ENABLED(CMD_NET)
+	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);
+#endif
+}
+
+void rockchip_cpuid_from_efuse(const u32 cpuid_offset,
+                               const u32 cpuid_length,
+                               u8 *cpuid)
+{
+#if CONFIG_IS_ENABLED(ROCKCHIP_EFUSE)
+	struct udevice *dev;
+	int ret;
+
+	/* retrieve the device */
+	ret = uclass_get_device_by_driver(UCLASS_MISC,
+					  DM_GET_DRIVER(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, cpuid_offset, cpuid, sizeof(cpuid));
+	if (ret) {
+		debug("%s: reading cpuid from the efuses failed\n",
+		      __func__);
+		return;
+	}
+#endif
+}
+
+void rockchip_cpuid_set(const u8 *cpuid, const u32 cpuid_length)
+{
+    u8 low[cpuid_length/2], high[cpuid_length/2];
+	char cpuid_str[cpuid_length * 2 + 1];
+	u64 serialno;
+	char serialno_str[17];
+	int i;
+
+    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), "%016llx", serialno);
+
+	env_set("cpuid#", cpuid_str);
+	env_set("serial#", serialno_str);
+}
diff --git a/board/rockchip/evb_rk3399/evb-rk3399.c b/board/rockchip/evb_rk3399/evb-rk3399.c
index eb1b832274..9253866c02 100644
--- a/board/rockchip/evb_rk3399/evb-rk3399.c
+++ b/board/rockchip/evb_rk3399/evb-rk3399.c
@@ -7,6 +7,7 @@
 #include <dm.h>
 #include <dm/pinctrl.h>
 #include <asm/arch-rockchip/periph.h>
+#include <asm/arch-rockchip/misc.h>
 #include <power/regulator.h>
 
 int board_init(void)
@@ -33,3 +34,15 @@ int board_init(void)
 out:
 	return 0;
 }
+
+int misc_init_r(void)
+{
+	const u32 cpuid_offset = 0x7;
+	const u32 cpuid_length = 0x10;
+	u8 cpuid[cpuid_length];
+
+	rockchip_cpuid_from_efuse(cpuid_offset, cpuid_length, cpuid);
+	rockchip_cpuid_set(cpuid, cpuid_length);
+	rockchip_setup_macaddr();
+	return 0;
+}
-- 
2.17.1