[PATCH u-boot-mvebu v2 4/5] arm: mvebu: a37xx: Extend mbox_do_cmd() code

[Pali Rohár]

Allow to specify input parameters, define all available mbox commands
supported by CZ.NIC's secure firmware and also Marvell's fuse.bin firmware
and fix parsing response from Marvell OTP commands.

Signed-off-by: Pali Rohár <pali at kernel.org>
Reviewed-by: Marek Behún <marek.behun at nic.cz>
---
 arch/arm/mach-mvebu/armada3700/mbox.c   | 20 ++++++++++++++++++--
 arch/arm/mach-mvebu/include/mach/mbox.h | 19 ++++++++++++++++++-
 board/CZ.NIC/turris_mox/mox_sp.c        |  4 ++--
 3 files changed, 38 insertions(+), 5 deletions(-)

diff --git a/arch/arm/mach-mvebu/armada3700/mbox.c b/arch/arm/mach-mvebu/armada3700/mbox.c
index cb86b967c2eb..eb1f82845f0f 100644
--- a/arch/arm/mach-mvebu/armada3700/mbox.c
+++ b/arch/arm/mach-mvebu/armada3700/mbox.c
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (C) 2018 Marek Behun <marek.behun at nic.cz>
+ * Copyright (C) 2021 Pali Rohár <pali at kernel.org>
  */
 
 #include <common.h>
@@ -15,6 +16,7 @@
 #define RWTM_CMD		(RWTM_BASE + 0x40)
 #define RWTM_CMD_RETSTATUS	(RWTM_BASE + 0x80)
 #define RWTM_CMD_STATUS(i)	(size_t)(RWTM_BASE + 0x84 + (i) * 4)
+#define MAX_ARGS		16
 
 #define RWTM_HOST_INT_RESET	(RWTM_BASE + 0xc8)
 #define RWTM_HOST_INT_MASK	(RWTM_BASE + 0xcc)
@@ -27,15 +29,27 @@
 #define MBOX_STS_ERROR(s)		((s) & (3 << 30))
 #define MBOX_STS_VALUE(s)		(((s) >> 10) & 0xfffff)
 #define MBOX_STS_CMD(s)			((s) & 0x3ff)
+#define MBOX_STS_MARVELL_ERROR(s)	((s) == 0 ? 0         : \
+					 (s) == 2 ? ETIMEDOUT : \
+					 (s) == 3 ? EINVAL    : \
+					 (s) == 4 ? ENOSYS    : \
+					            EIO)
 
-int mbox_do_cmd(enum mbox_cmd cmd, u32 *out, int nout)
+int mbox_do_cmd(enum mbox_cmd cmd, u32 *in, int nin, u32 *out, int nout)
 {
 	const int tries = 50;
 	int i;
 	u32 status;
 
+	if (nin > MAX_ARGS || nout > MAX_ARGS)
+		return -EINVAL;
+
 	clrbits_le32(RWTM_HOST_INT_MASK, SP_CMD_COMPLETE);
 
+	for (i = 0; i < nin; i++)
+		writel(in[i], RWTM_CMD_PARAM(i));
+	for (; i < MAX_ARGS; i++)
+		writel(0x0, RWTM_CMD_PARAM(i));
 	writel(cmd, RWTM_CMD);
 
 	for (i = 0; i < tries; ++i) {
@@ -57,9 +71,11 @@ int mbox_do_cmd(enum mbox_cmd cmd, u32 *out, int nout)
 	setbits_le32(RWTM_HOST_INT_RESET, SP_CMD_COMPLETE);
 
 	if (MBOX_STS_CMD(status) != cmd)
-		return -EIO;
+		return -MBOX_STS_MARVELL_ERROR(status);
 	else if (MBOX_STS_ERROR(status) == MBOX_STS_FAIL)
 		return -(int)MBOX_STS_VALUE(status);
+	else if (MBOX_STS_ERROR(status) == MBOX_STS_BADCMD)
+		return -ENOSYS;
 	else if (MBOX_STS_ERROR(status) != MBOX_STS_SUCCESS)
 		return -EIO;
 	else
diff --git a/arch/arm/mach-mvebu/include/mach/mbox.h b/arch/arm/mach-mvebu/include/mach/mbox.h
index 981204935832..f1cb55f2bfe7 100644
--- a/arch/arm/mach-mvebu/include/mach/mbox.h
+++ b/arch/arm/mach-mvebu/include/mach/mbox.h
@@ -1,6 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright (C) 2018 Marek Behun <marek.behun at nic.cz>
+ * Copyright (C) 2021 Pali Rohár <pali at kernel.org>
  */
 
 #ifndef _MVEBU_MBOX_H
@@ -16,8 +17,24 @@ enum mbox_cmd {
 
 	MBOX_CMD_OTP_READ,
 	MBOX_CMD_OTP_WRITE,
+
+	MBOX_CMD_REBOOT,
+
+	/* OTP read commands supported by Marvell fuse.bin firmware */
+	MBOX_CMD_OTP_READ_1B	= 257,
+	MBOX_CMD_OTP_READ_8B,
+	MBOX_CMD_OTP_READ_32B,
+	MBOX_CMD_OTP_READ_64B,
+	MBOX_CMD_OTP_READ_256B,
+
+	/* OTP write commands supported by Marvell fuse.bin firmware */
+	MBOX_CMD_OTP_WRITE_1B	= 513,
+	MBOX_CMD_OTP_WRITE_8B,
+	MBOX_CMD_OTP_WRITE_32B,
+	MBOX_CMD_OTP_WRITE_64B,
+	MBOX_CMD_OTP_WRITE_256B,
 };
 
-int mbox_do_cmd(enum mbox_cmd cmd, u32 *in, int nout);
+int mbox_do_cmd(enum mbox_cmd cmd, u32 *in, int nin, u32 *out, int nout);
 
 #endif
diff --git a/board/CZ.NIC/turris_mox/mox_sp.c b/board/CZ.NIC/turris_mox/mox_sp.c
index 4de067bbebbb..93e96b014fca 100644
--- a/board/CZ.NIC/turris_mox/mox_sp.c
+++ b/board/CZ.NIC/turris_mox/mox_sp.c
@@ -19,7 +19,7 @@ const char *mox_sp_get_ecdsa_public_key(void)
 	if (public_key[0])
 		return public_key;
 
-	res = mbox_do_cmd(MBOX_CMD_ECDSA_PUB_KEY, out, 16);
+	res = mbox_do_cmd(MBOX_CMD_ECDSA_PUB_KEY, NULL, 0, out, 16);
 	if (res < 0)
 		return NULL;
 
@@ -47,7 +47,7 @@ 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);
+	res = mbox_do_cmd(MBOX_CMD_BOARD_INFO, NULL, 0, out, 8);
 	if (res < 0)
 		return res;
 
-- 
2.20.1