arm: mvebu: a37xx: Move generic mbox code to arch/arm/mach-mvebu

Generic A3720 mbox code is currently in Turris Mox specific board file
board/CZ.NIC/turris_mox/mox_sp.c. Move it to board independent arch file
arch/arm/mach-mvebu/armada3700/mbox.c.

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

3 files changed, 91 insertions, 1 deletions

diff --git a/arch/arm/mach-mvebu/armada3700/Makefile b/arch/arm/mach-mvebu/armada3700/Makefile
index cd74726cc7..98350a41e0 100644
--- a/arch/arm/mach-mvebu/armada3700/Makefile
+++ b/arch/arm/mach-mvebu/armada3700/Makefile
@@ -2,5 +2,5 @@
 #
 # Copyright (C) 2016 Stefan Roese <sr@denx.de>
 
-obj-y = cpu.o
+obj-y = cpu.o mbox.o
 obj-$(CONFIG_MVEBU_EFUSE) += efuse.o
diff --git a/arch/arm/mach-mvebu/armada3700/mbox.c b/arch/arm/mach-mvebu/armada3700/mbox.c
new file mode 100644
index 0000000000..cb86b967c2
--- /dev/null
+++ b/arch/arm/mach-mvebu/armada3700/mbox.c
@@ -0,0 +1,67 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Marek Behun <marek.behun@nic.cz>
+ */
+
+#include <common.h>
+#include <asm/arch/soc.h>
+#include <asm/io.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <mach/mbox.h>
+
+#define RWTM_BASE		(MVEBU_REGISTER(0xb0000))
+#define RWTM_CMD_PARAM(i)	(size_t)(RWTM_BASE + (i) * 4)
+#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 RWTM_HOST_INT_RESET	(RWTM_BASE + 0xc8)
+#define RWTM_HOST_INT_MASK	(RWTM_BASE + 0xcc)
+#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)
+
+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);
+}
diff --git a/arch/arm/mach-mvebu/include/mach/mbox.h b/arch/arm/mach-mvebu/include/mach/mbox.h
new file mode 100644
index 0000000000..9812049358
--- /dev/null
+++ b/arch/arm/mach-mvebu/include/mach/mbox.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 Marek Behun <marek.behun@nic.cz>
+ */
+
+#ifndef _MVEBU_MBOX_H
+#define _MVEBU_MBOX_H
+
+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,
+};
+
+int mbox_do_cmd(enum mbox_cmd cmd, u32 *in, int nout);
+
+#endif