arm: mvebu: turris_omnia: Implement getting board information from MCU

Implement reading board serial number, first MAC address and board
version from MCU. MCU supports board information if the FEAT_BOARD_INFO
feature bit is set in MCU features.

Prefer getting board information from MCU if supported, fallback to
Atmel SHA chip.

Signed-off-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>

board/CZ.NIC/turris_atsha_otp.c

@@ -11,6 +11,7 @@
 #include <atsha204a-i2c.h>
 
 #include "turris_atsha_otp.h"
+#include "turris_common.h"
 
 #define TURRIS_ATSHA_OTP_VERSION	0
 #define TURRIS_ATSHA_OTP_SERIAL		1
@@ -32,26 +33,6 @@ static struct udevice *get_atsha204a_dev(void)
 	return dev;
 }
 
-static void increment_mac(u8 *mac)
-{
-	int i;
-
-	for (i = 5; i >= 3; i--) {
-		mac[i] += 1;
-		if (mac[i])
-			break;
-	}
-}
-
-static void set_mac_if_invalid(int i, u8 *mac)
-{
-	u8 oldmac[6];
-
-	if (is_valid_ethaddr(mac) &&
-	    !eth_env_get_enetaddr_by_index("eth", i, oldmac))
-		eth_env_set_enetaddr_by_index("eth", i, mac);
-}
-
 int turris_atsha_otp_init_mac_addresses(int first_idx)
 {
 	struct udevice *dev = get_atsha204a_dev();
@@ -84,11 +65,7 @@ int turris_atsha_otp_init_mac_addresses(int first_idx)
 	mac[4] = mac1[2];
 	mac[5] = mac1[3];
 
-	set_mac_if_invalid((first_idx + 0) % 3, mac);
-	increment_mac(mac);
-	set_mac_if_invalid((first_idx + 1) % 3, mac);
-	increment_mac(mac);
-	set_mac_if_invalid((first_idx + 2) % 3, mac);
+	turris_init_mac_addresses(first_idx, mac);
 
 	return 0;
 }

board/CZ.NIC/turris_common.c

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2017 Marek Behún <kabel@kernel.org>
+ */
+
+#include <env.h>
+#include <net.h>
+
+#include "turris_common.h"
+
+static void increment_mac(u8 *mac)
+{
+	int i;
+
+	for (i = 5; i >= 3; i--) {
+		mac[i] += 1;
+		if (mac[i])
+			break;
+	}
+}
+
+static void set_mac_if_invalid(int i, u8 *mac)
+{
+	u8 oldmac[6];
+
+	if (is_valid_ethaddr(mac) &&
+	    !eth_env_get_enetaddr_by_index("eth", i, oldmac))
+		eth_env_set_enetaddr_by_index("eth", i, mac);
+}
+
+void turris_init_mac_addresses(int first_idx, const u8 *first_mac)
+{
+	u8 mac[6];
+
+	memcpy(mac, first_mac, sizeof(mac));
+
+	set_mac_if_invalid((first_idx + 0) % 3, mac);
+	increment_mac(mac);
+	set_mac_if_invalid((first_idx + 1) % 3, mac);
+	increment_mac(mac);
+	set_mac_if_invalid((first_idx + 2) % 3, mac);
+}

board/CZ.NIC/turris_common.h

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#ifndef TURRIS_COMMON_H
+#define TURRIS_COMMON_H
+
+#include <asm/types.h>
+
+void turris_init_mac_addresses(int first_idx, const u8 *first_mac);
+
+#endif

board/CZ.NIC/turris_omnia/Makefile

@@ -2,4 +2,4 @@
 #
 # Copyright (C) 2017 Marek Behún <kabel@kernel.org>
 
-obj-y	:= turris_omnia.o ../turris_atsha_otp.o
+obj-y	:= turris_omnia.o ../turris_atsha_otp.o ../turris_common.o

board/CZ.NIC/turris_omnia/turris_omnia.c

@@ -18,6 +18,7 @@
 #include <asm/io.h>
 #include <asm/arch/cpu.h>
 #include <asm/arch/soc.h>
+#include <asm/unaligned.h>
 #include <dm/uclass.h>
 #include <dt-bindings/gpio/gpio.h>
 #include <fdt_support.h>
@@ -25,12 +26,14 @@
 #include <time.h>
 #include <turris-omnia-mcu-interface.h>
 #include <linux/bitops.h>
+#include <linux/bitrev.h>
 #include <linux/delay.h>
 #include <u-boot/crc.h>
 
 #include "../drivers/ddr/marvell/a38x/ddr3_init.h"
 #include <../serdes/a38x/high_speed_env_spec.h>
 #include "../turris_atsha_otp.h"
+#include "../turris_common.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -186,6 +189,70 @@ static bool omnia_mcu_has_feature(u32 feature)
 	return feature & features;
 }
 
+static u32 omnia_mcu_crc32(const void *p, size_t len)
+{
+	u32 val, crc = 0;
+
+	compiletime_assert(!(len % 4), "length has to be a multiple of 4");
+
+	while (len) {
+		val = bitrev32(get_unaligned_le32(p));
+		crc = crc32(crc, (void *)&val, 4);
+		p += 4;
+		len -= 4;
+	}
+
+	return ~bitrev32(crc);
+}
+
+/* Can only be called after relocation, since it needs cleared BSS */
+static int omnia_mcu_board_info(char *serial, u8 *mac, char *version)
+{
+	static u8 reply[17];
+	static bool cached;
+
+	if (!cached) {
+		u8 csum;
+		int ret;
+
+		ret = omnia_mcu_read(CMD_BOARD_INFO_GET, reply, sizeof(reply));
+		if (ret)
+			return ret;
+
+		if (reply[0] != 16)
+			return -EBADMSG;
+
+		csum = reply[16];
+		reply[16] = 0;
+
+		if ((omnia_mcu_crc32(&reply[1], 16) & 0xff) != csum)
+			return -EBADMSG;
+
+		cached = true;
+	}
+
+	if (serial) {
+		const char *serial_env;
+
+		serial_env = env_get("serial#");
+		if (serial_env && strlen(serial_env) == 16) {
+			strcpy(serial, serial_env);
+		} else {
+			sprintf(serial, "%016llX",
+				get_unaligned_le64(&reply[1]));
+			env_set("serial#", serial);
+		}
+	}
+
+	if (mac)
+		memcpy(mac, &reply[9], ETH_ALEN);
+
+	if (version)
+		sprintf(version, "%u", reply[15]);
+
+	return 0;
+}
+
 static void enable_a385_watchdog(unsigned int timeout_minutes)
 {
 	struct sar_freq_modes sar_freq;
@@ -965,13 +1032,23 @@ int board_late_init(void)
 
 int checkboard(void)
 {
-	char serial[17];
+	char serial[17], version[4];
+	bool has_version;
 	int err;
 
-	err = turris_atsha_otp_get_serial_number(serial);
 	printf("  MCU type: %s\n", omnia_get_mcu_type());
 	printf("  MCU version: %s\n", omnia_get_mcu_version());
 	printf("  RAM size: %i MiB\n", omnia_get_ram_size_gb() * 1024);
+
+	if (omnia_mcu_has_feature(FEAT_BOARD_INFO)) {
+		err = omnia_mcu_board_info(serial, NULL, version);
+		has_version = !err;
+	} else {
+		err = turris_atsha_otp_get_serial_number(serial);
+		has_version = false;
+	}
+
+	printf("  Board version: %s\n", has_version ? version : "unknown");
 	printf("  Serial Number: %s\n", !err ? serial : "unknown");
 
 	return 0;
@@ -979,8 +1056,17 @@ int checkboard(void)
 
 int misc_init_r(void)
 {
+	if (omnia_mcu_has_feature(FEAT_BOARD_INFO)) {
+		char serial[17];
+		u8 first_mac[6];
+
+		if (!omnia_mcu_board_info(serial, first_mac, NULL))
+			turris_init_mac_addresses(1, first_mac);
+	} else {
 		turris_atsha_otp_init_mac_addresses(1);
 		turris_atsha_otp_init_serial_number();
+	}
+
 	return 0;
 }