nxp: added csu driver
NXP Central Security Unit(CSU) for NXP SoC.
CSU is used for:
- Access permissions for peripheral that donot have their own
access control.
- Locking of individual CSU settings until the next POR
- General purpose security related control bits
Refer NXP SoC manuals fro more details.
Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com>
Change-Id: I07a4729c79c5e2597f8b2a782e87e09f7f30c2ca
diff --git a/drivers/nxp/csu/csu.c b/drivers/nxp/csu/csu.c
new file mode 100644
index 0000000..9f90fe0
--- /dev/null
+++ b/drivers/nxp/csu/csu.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2020 NXP
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#include <endian.h>
+
+#include <common/debug.h>
+#include <csu.h>
+#include <lib/mmio.h>
+
+void enable_layerscape_ns_access(struct csu_ns_dev_st *csu_ns_dev,
+ uint32_t num, uintptr_t nxp_csu_addr)
+{
+ uint32_t *base = (uint32_t *)nxp_csu_addr;
+ uint32_t *reg;
+ uint32_t val;
+ int i;
+
+ for (i = 0; i < num; i++) {
+ reg = base + csu_ns_dev[i].ind / 2U;
+ val = be32toh(mmio_read_32((uintptr_t)reg));
+ if (csu_ns_dev[i].ind % 2U == 0U) {
+ val &= 0x0000ffffU;
+ val |= csu_ns_dev[i].val << 16U;
+ } else {
+ val &= 0xffff0000U;
+ val |= csu_ns_dev[i].val;
+ }
+ mmio_write_32((uintptr_t)reg, htobe32(val));
+ }
+}
diff --git a/drivers/nxp/csu/csu.h b/drivers/nxp/csu/csu.h
new file mode 100644
index 0000000..9f82feb
--- /dev/null
+++ b/drivers/nxp/csu/csu.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2020 NXP
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#ifndef CSU_H
+#define CSU_H
+
+#define CSU_SEC_ACCESS_REG_OFFSET (0x0021CU)
+
+/* Macros defining access permissions to configure
+ * the regions controlled by Central Security Unit.
+ */
+enum csu_cslx_access {
+ CSU_NS_SUP_R = (0x8U),
+ CSU_NS_SUP_W = (0x80U),
+ CSU_NS_SUP_RW = (0x88U),
+ CSU_NS_USER_R = (0x4U),
+ CSU_NS_USER_W = (0x40U),
+ CSU_NS_USER_RW = (0x44U),
+ CSU_S_SUP_R = (0x2U),
+ CSU_S_SUP_W = (0x20U),
+ CSU_S_SUP_RW = (0x22U),
+ CSU_S_USER_R = (0x1U),
+ CSU_S_USER_W = (0x10U),
+ CSU_S_USER_RW = (0x11U),
+ CSU_ALL_RW = (0xffU),
+};
+
+struct csu_ns_dev_st {
+ uintptr_t ind;
+ uint32_t val;
+};
+
+void enable_layerscape_ns_access(struct csu_ns_dev_st *csu_ns_dev,
+ uint32_t num, uintptr_t nxp_csu_addr);
+
+#endif
diff --git a/drivers/nxp/csu/csu.mk b/drivers/nxp/csu/csu.mk
new file mode 100644
index 0000000..ebdf674
--- /dev/null
+++ b/drivers/nxp/csu/csu.mk
@@ -0,0 +1,28 @@
+#
+# Copyright 2020 NXP
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-----------------------------------------------------------------------------
+ifeq (${CSU_ADDED},)
+
+CSU_ADDED := 1
+
+CSU_DRIVERS_PATH := ${PLAT_DRIVERS_PATH}/csu
+
+PLAT_INCLUDES += -I$(CSU_DRIVERS_PATH)
+
+CSU_SOURCES += $(CSU_DRIVERS_PATH)/csu.c
+
+ifeq (${BL_COMM_CSU_NEEDED},yes)
+BL_COMMON_SOURCES += ${CSU_SOURCES}
+else
+ifeq (${BL2_CSU_NEEDED},yes)
+BL2_SOURCES += ${CSU_SOURCES}
+endif
+ifeq (${BL31_CSU_NEEDED},yes)
+BL31_SOURCES += ${CSU_SOURCES}
+endif
+endif
+
+endif