arm: mvebu: turris_mox: Read info (and ethaddrs) from OTP

Add support for reading One-Time Programmable memory via mailbox, which
communicates with CZ.NIC's firmware on the Secure Processor (Cortex-M3)
of Armada 3720.

Display product serial number and additional info, and also set MAC
addresses.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>

board/CZ.NIC/turris_mox/Makefile

@@ -2,4 +2,4 @@
 #
 # Copyright (C) 2018 Marek Behun <marek.behun@nic.cz>
 
-obj-y	:= turris_mox.o
+obj-y	:= turris_mox.o mox_sp.o

board/CZ.NIC/turris_mox/mox_sp.c

@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Marek Behun <marek.behun@nic.cz>
+ */
+
+#include <common.h>
+#include <asm/io.h>
+
+#define RWTM_CMD_PARAM(i)	(size_t)(0xd00b0000 + (i) * 4)
+#define RWTM_CMD		0xd00b0040
+#define RWTM_CMD_RETSTATUS	0xd00b0080
+#define RWTM_CMD_STATUS(i)	(size_t)(0xd00b0084 + (i) * 4)
+
+#define RWTM_HOST_INT_RESET	0xd00b00c8
+#define RWTM_HOST_INT_MASK	0xd00b00cc
+#define SP_CMD_COMPLETE		BIT(0)
+
+#define MBOX_STS_SUCCESS		(0x0 << 30)
+#define MBOX_STS_FAIL			(0x1 << 30)
+#define MBOX_STS_BADCMD			(0x2 << 30)
+#define MBOX_STS_LATER			(0x3 << 30)
+#define MBOX_STS_ERROR(s)		((s) & (3 << 30))
+#define MBOX_STS_VALUE(s)		(((s) >> 10) & 0xfffff)
+#define MBOX_STS_CMD(s)			((s) & 0x3ff)
+
+enum mbox_cmd {
+	MBOX_CMD_GET_RANDOM	= 1,
+	MBOX_CMD_BOARD_INFO,
+	MBOX_CMD_ECDSA_PUB_KEY,
+	MBOX_CMD_HASH,
+	MBOX_CMD_SIGN,
+	MBOX_CMD_VERIFY,
+
+	MBOX_CMD_OTP_READ,
+	MBOX_CMD_OTP_WRITE
+};
+
+static int mbox_do_cmd(enum mbox_cmd cmd, u32 *out, int nout)
+{
+	const int tries = 50;
+	int i;
+	u32 status;
+
+	clrbits_le32(RWTM_HOST_INT_MASK, SP_CMD_COMPLETE);
+
+	writel(cmd, RWTM_CMD);
+
+	for (i = 0; i < tries; ++i) {
+		mdelay(10);
+		if (readl(RWTM_HOST_INT_RESET) & SP_CMD_COMPLETE)
+			break;
+	}
+
+	if (i == tries) {
+		/* if timed out, don't read status */
+		setbits_le32(RWTM_HOST_INT_RESET, SP_CMD_COMPLETE);
+		return -ETIMEDOUT;
+	}
+
+	for (i = 0; i < nout; ++i)
+		out[i] = readl(RWTM_CMD_STATUS(i));
+	status = readl(RWTM_CMD_RETSTATUS);
+
+	setbits_le32(RWTM_HOST_INT_RESET, SP_CMD_COMPLETE);
+
+	if (MBOX_STS_CMD(status) != cmd)
+		return -EIO;
+	else if (MBOX_STS_ERROR(status) == MBOX_STS_FAIL)
+		return -(int)MBOX_STS_VALUE(status);
+	else if (MBOX_STS_ERROR(status) != MBOX_STS_SUCCESS)
+		return -EIO;
+	else
+		return MBOX_STS_VALUE(status);
+}
+
+const char *mox_sp_get_ecdsa_public_key(void)
+{
+	static char public_key[135];
+	u32 out[16];
+	int res;
+
+	if (public_key[0])
+		return public_key;
+
+	res = mbox_do_cmd(MBOX_CMD_ECDSA_PUB_KEY, out, 16);
+	if (res < 0)
+		return NULL;
+
+	sprintf(public_key,
+		"%06x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x%08x",
+		(u32)res, out[0], out[1], out[2], out[3], out[4], out[5],
+		out[6], out[7], out[8], out[9], out[10], out[11], out[12],
+		out[13], out[14], out[15]);
+
+	return public_key;
+}
+
+static inline void res_to_mac(u8 *mac, u32 t1, u32 t2)
+{
+	mac[0] = t1 >> 8;
+	mac[1] = t1;
+	mac[2] = t2 >> 24;
+	mac[3] = t2 >> 16;
+	mac[4] = t2 >> 8;
+	mac[5] = t2;
+}
+
+int mbox_sp_get_board_info(u64 *sn, u8 *mac1, u8 *mac2, int *bv, int *ram)
+{
+	u32 out[8];
+	int res;
+
+	res = mbox_do_cmd(MBOX_CMD_BOARD_INFO, out, 8);
+	if (res < 0)
+		return res;
+
+	if (sn) {
+		*sn = out[1];
+		*sn <<= 32;
+		*sn |= out[0];
+	}
+
+	if (bv)
+		*bv = out[2];
+
+	if (ram)
+		*ram = out[3];
+
+	if (mac1)
+		res_to_mac(mac1, out[4], out[5]);
+
+	if (mac2)
+		res_to_mac(mac2, out[6], out[7]);
+
+	return 0;
+}

board/CZ.NIC/turris_mox/mox_sp.h

@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 Marek Behun <marek.behun@nic.cz>
+ */
+
+#ifndef _BOARD_CZNIC_TURRIS_MOX_MOX_SP_H_
+#define _BOARD_CZNIC_TURRIS_MOX_MOX_SP_H_
+
+#include <common.h>
+
+const char *mox_sp_get_ecdsa_public_key(void);
+int mbox_sp_get_board_info(u64 *sn, u8 *mac1, u8 *mac2, int *bv,
+			   int *ram);
+
+#endif /* _BOARD_CZNIC_TURRIS_MOX_MOX_SP_H_ */

board/CZ.NIC/turris_mox/turris_mox.c

@@ -14,11 +14,14 @@
 #include <linux/string.h>
 #include <linux/libfdt.h>
 #include <fdt_support.h>
+#include <environment.h>
 
 #ifdef CONFIG_WDT_ARMADA_37XX
 #include <wdt.h>
 #endif
 
+#include "mox_sp.h"
+
 #define MAX_MOX_MODULES		10
 
 #define MOX_MODULE_SFP		0x1
@@ -366,6 +369,49 @@ static int get_reset_gpio(struct gpio_desc *reset_gpio)
 	return 0;
 }
 
+int misc_init_r(void)
+{
+	int ret;
+	u8 mac1[6], mac2[6];
+
+	ret = mbox_sp_get_board_info(NULL, mac1, mac2, NULL, NULL);
+	if (ret < 0) {
+		printf("Cannot read data from OTP!\n");
+		return 0;
+	}
+
+	if (is_valid_ethaddr(mac1) && !env_get("ethaddr"))
+		eth_env_set_enetaddr("ethaddr", mac1);
+
+	if (is_valid_ethaddr(mac2) && !env_get("eth1addr"))
+		eth_env_set_enetaddr("eth1addr", mac2);
+
+	return 0;
+}
+
+static void mox_print_info(void)
+{
+	int ret, board_version, ram_size;
+	u64 serial_number;
+	const char *pub_key;
+
+	ret = mbox_sp_get_board_info(&serial_number, NULL, NULL, &board_version,
+				     &ram_size);
+	if (ret < 0)
+		return;
+
+	printf("Turris Mox:\n");
+	printf("  Board version: %i\n", board_version);
+	printf("  RAM size: %i MiB\n", ram_size);
+	printf("  Serial Number: %016llX\n", serial_number);
+
+	pub_key = mox_sp_get_ecdsa_public_key();
+	if (pub_key)
+		printf("  ECDSA Public Key: %s\n", pub_key);
+	else
+		printf("Cannot read ECDSA Public Key\n");
+}
+
 int last_stage_init(void)
 {
 	int ret, i;
@@ -374,14 +420,19 @@ int last_stage_init(void)
 	struct mii_dev *bus;
 	struct gpio_desc reset_gpio = {};
 
+	mox_print_info();
+
 	ret = mox_get_topology(&topology, &module_count, &is_sd);
 	if (ret) {
 		printf("Cannot read module topology!\n");
 		return 0;
 	}
 
-	printf("Found Turris Mox %s version\n", is_sd ? "SD" : "eMMC");
-	printf("Module Topology:\n");
+	printf("  SD/eMMC version: %s\n", is_sd ? "SD" : "eMMC");
+
+	if (module_count)
+		printf("Module Topology:\n");
+
 	for (i = 0; i < module_count; ++i) {
 		switch (topology[i]) {
 		case MOX_MODULE_SFP: