drivers: marvell: add support for secure read/write of dfx register-set

Since the dfx register set is going to be marked as secure expose dfx
secure read and write function via SiP services. In introduced misc_dfx
driver some registers are white-listed so non-secure software can still
access them.

This will allow non-secure word drivers access some white-listed
registers related to e.g.:  Sample at reset, efuses, SoC type and
revision ID accesses.

Change-Id: If9ae2da51ab2e6ca62b9a2c940819259bf25edc0
Signed-off-by: Grzegorz Jaszczyk <jaz@semihalf.com>
Reviewed-on: https://sj1git1.cavium.com/25055
Tested-by: Kostya Porotchkin <kostap@marvell.com>
Reviewed-by: Kostya Porotchkin <kostap@marvell.com>

drivers/marvell/secure_dfx_access/dfx.h

@@ -13,5 +13,10 @@
 #define MV_SIP_DFX_THERMAL_THRESH	5
 #define MV_SIP_DFX_THERMAL_SEL_CHANNEL	6
 
+#define MV_SIP_DFX_SREAD		20
+#define MV_SIP_DFX_SWRITE		21
+
 int mvebu_dfx_thermal_handle(u_register_t func, u_register_t *read,
 			     u_register_t x2, u_register_t x3);
+int mvebu_dfx_misc_handle(u_register_t func, u_register_t *read,
+			  u_register_t addr, u_register_t val);

drivers/marvell/secure_dfx_access/misc_dfx.c

@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2021 Marvell International Ltd.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ * https://spdx.org/licenses
+ */
+
+#include <common/debug.h>
+#include <lib/mmio.h>
+#include "dfx.h"
+#include <mvebu_def.h>
+#include <mvebu.h>
+#include <errno.h>
+
+/* #define DEBUG_DFX */
+#ifdef DEBUG_DFX
+#define debug(format...) NOTICE(format)
+#else
+#define debug(format, arg...)
+#endif
+
+#define SAR_BASE			(MVEBU_REGS_BASE + 0x6F8200)
+#define SAR_SIZE			0x4
+#define AP_DEV_ID_STATUS_REG		(MVEBU_REGS_BASE + 0x6F8240)
+#define JTAG_DEV_ID_STATUS_REG		(MVEBU_REGS_BASE + 0x6F8244)
+#define EFUSE_CTRL			(MVEBU_REGS_BASE + 0x6F8008)
+#define EFUSE_LD_BASE			(MVEBU_REGS_BASE + 0x6F8F00)
+#define EFUSE_LD_SIZE			0x1C
+#define EFUSE_HD_BASE			(MVEBU_REGS_BASE + 0x6F9000)
+#define EFUSE_HD_SIZE			0x3F8
+
+static _Bool is_valid(u_register_t addr)
+{
+	switch (addr) {
+	case AP_DEV_ID_STATUS_REG:
+	case JTAG_DEV_ID_STATUS_REG:
+	case SAR_BASE ... (SAR_BASE + SAR_SIZE):
+	case EFUSE_LD_BASE ... (EFUSE_LD_BASE + EFUSE_LD_SIZE):
+	case EFUSE_HD_BASE ... (EFUSE_HD_BASE + EFUSE_HD_SIZE):
+	case EFUSE_CTRL:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static int armada_dfx_sread(u_register_t *read, u_register_t addr)
+{
+	if (!is_valid(addr))
+		return -EINVAL;
+
+	*read = mmio_read_32(addr);
+
+	return 0;
+}
+
+static int armada_dfx_swrite(u_register_t addr, u_register_t val)
+{
+	if (!is_valid(addr))
+		return -EINVAL;
+
+	mmio_write_32(addr, val);
+
+	return 0;
+}
+
+int mvebu_dfx_misc_handle(u_register_t func, u_register_t *read,
+			  u_register_t addr, u_register_t val)
+{
+	debug_enter();
+
+	debug("func %ld, addr 0x%lx, val 0x%lx\n", func, addr, val);
+
+	switch (func) {
+	case MV_SIP_DFX_SREAD:
+		return armada_dfx_sread(read, addr);
+	case MV_SIP_DFX_SWRITE:
+		return armada_dfx_swrite(addr, val);
+	default:
+		ERROR("unsupported dfx misc sub-func\n");
+		return -EINVAL;
+	}
+
+	debug_exit();
+
+	return 0;
+}

plat/marvell/armada/a8k/common/a8k_common.mk

@@ -116,6 +116,7 @@ MARVELL_DRV		:= 	$(MARVELL_DRV_BASE)/io_win.c	\
 				$(MARVELL_DRV_BASE)/mc_trustzone/mc_trustzone.c	\
 				$(MARVELL_DRV_BASE)/mg_conf_cm3/mg_conf_cm3.c	\
 				$(MARVELL_DRV_BASE)/secure_dfx_access/armada_thermal.c	\
+				$(MARVELL_DRV_BASE)/secure_dfx_access/misc_dfx.c	\
 				$(MARVELL_DRV_BASE)/ddr_phy_access.c	\
 				drivers/rambus/trng_ip_76.c
 

plat/marvell/armada/common/mrvl_sip_svc.c

@@ -147,6 +147,11 @@ uintptr_t mrvl_sip_smc_handler(uint32_t smc_fid,
 			ret = mvebu_dfx_thermal_handle(x1, &read, x2, x3);
 			SMC_RET2(handle, ret, read);
 		}
+		if (x1 >= MV_SIP_DFX_SREAD && x1 <= MV_SIP_DFX_SWRITE) {
+			ret = mvebu_dfx_misc_handle(x1, &read, x2, x3);
+			SMC_RET2(handle, ret, read);
+		}
+
 		SMC_RET1(handle, SMC_UNK);
 	case MV_SIP_DDR_PHY_WRITE:
 		ret = mvebu_ddr_phy_write(x1, x2);