nxp: warm reset support to retain ddr content

NXP: Added warm reset handler to handle SMC PSCI_SYSTEM_RESET2
raised from kernel (> 5.4).

As part of first cold boot, DDR training data is stored in NV storage.

As part of this SMC handling, following things are done:
- DDR is put in self-refresh mode to retain the content of DDR.
- Reset cause is saved.
- Reset is triggered.

On next boot to last warm-reset, DDR training is restored from
the NV storage.

Signed-off-by: Ashish Kumar <ashish.kumar@nxp.com>
Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Signed-off-by: Udit Agarwal <udit.agarwal@nxp.com>
Signed-off-by: Priyanka Singh <priyanka.singh@nxp.com>
Signed-off-by: Pankaj Gupta <pankaj.gupta@nxp.com>
Change-Id: I8e4fb0824887af49e959c93825e2ab0ba887fc9d

plat/nxp/common/warm_reset/plat_warm_reset.c

@@ -0,0 +1,121 @@
+/*
+ * Copyright 2021 NXP
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#include <errno.h>
+
+#include <common/debug.h>
+#include <ddr.h>
+#ifndef NXP_COINED_BB
+#include <flash_info.h>
+#include <fspi.h>
+#include <fspi_api.h>
+#endif
+#include <lib/mmio.h>
+#include <lib/psci/psci.h>
+#ifdef NXP_COINED_BB
+#include <snvs.h>
+#endif
+
+#include <plat_nv_storage.h>
+#include "plat_warm_rst.h"
+#include "platform_def.h"
+
+#if defined(IMAGE_BL2)
+
+uint32_t is_warm_boot(void)
+{
+	uint32_t ret = mmio_read_32(NXP_RESET_ADDR + RST_RSTRQSR1_OFFSET)
+				& ~(RSTRQSR1_SWRR);
+
+	const nv_app_data_t *nv_app_data = get_nv_data();
+
+	if (ret == 0U) {
+		INFO("Not a SW(Warm) triggered reset.\n");
+		return 0U;
+	}
+
+	ret = (nv_app_data->warm_rst_flag == WARM_BOOT_SUCCESS) ? 1 : 0;
+
+	if (ret != 0U) {
+		INFO("Warm Reset was triggered..\n");
+	} else {
+		INFO("Warm Reset was not triggered..\n");
+	}
+
+	return ret;
+}
+
+#endif
+
+#if defined(IMAGE_BL31)
+int prep_n_execute_warm_reset(void)
+{
+#ifdef NXP_COINED_BB
+#if !TRUSTED_BOARD_BOOT
+	snvs_disable_zeroize_lp_gpr();
+#endif
+#else
+	int ret;
+	uint8_t warm_reset = WARM_BOOT_SUCCESS;
+
+	ret = fspi_init(NXP_FLEXSPI_ADDR, NXP_FLEXSPI_FLASH_ADDR);
+
+	if (ret != 0) {
+		ERROR("Failed to initialized driver flexspi-nor.\n");
+		ERROR("exiting warm-reset request.\n");
+		return PSCI_E_INTERN_FAIL;
+	}
+
+	/* Sector starting from NV_STORAGE_BASE_ADDR is already
+	 * erased for writing.
+	 */
+
+#if (ERLY_WRM_RST_FLG_FLSH_UPDT)
+	ret = xspi_write((uint32_t)NV_STORAGE_BASE_ADDR,
+			 &warm_reset,
+			 sizeof(warm_reset));
+#else
+	/* Preparation for writing the Warm reset flag. */
+	ret = xspi_wren((uint32_t)NV_STORAGE_BASE_ADDR);
+
+	/* IP Control Register0 - SF Address to be read */
+	fspi_out32((NXP_FLEXSPI_ADDR + FSPI_IPCR0),
+		   (uint32_t) NV_STORAGE_BASE_ADDR);
+
+	while ((fspi_in32(NXP_FLEXSPI_ADDR + FSPI_INTR) &
+		FSPI_INTR_IPTXWE_MASK) == 0) {
+		;
+	}
+	/* Write TX FIFO Data Register */
+	fspi_out32(NXP_FLEXSPI_ADDR + FSPI_TFDR, (uint32_t) warm_reset);
+
+	fspi_out32(NXP_FLEXSPI_ADDR + FSPI_INTR, FSPI_INTR_IPTXWE);
+
+	/* IP Control Register1 - SEQID_WRITE operation, Size = 1 Byte */
+	fspi_out32(NXP_FLEXSPI_ADDR + FSPI_IPCR1,
+		   (uint32_t)(FSPI_WRITE_SEQ_ID << FSPI_IPCR1_ISEQID_SHIFT) |
+		   (uint16_t) sizeof(warm_reset));
+
+	/* Trigger XSPI-IP-Write cmd only if:
+	 *  - Putting DDR in-self refresh mode is successfully.
+	 *    to complete the writing of the warm-reset flag
+	 *    to flash.
+	 *
+	 * This code is as part of assembly.
+	 */
+#endif
+#endif
+	INFO("Doing DDR Self refresh.\n");
+	_soc_sys_warm_reset();
+
+	/* Expected behaviour is to do the power cycle */
+	while (1 != 0)
+		;
+
+	return -1;
+}
+#endif

plat/nxp/common/warm_reset/plat_warm_rst.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2021 NXP
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ */
+
+#ifndef PLAT_WARM_RST_H
+#define PLAT_WARM_RST_H
+
+#ifndef NXP_COINED_BB
+#define ERLY_WRM_RST_FLG_FLSH_UPDT	0
+#endif
+
+#ifndef __ASSEMBLER__
+
+#if defined(IMAGE_BL2)
+uint32_t is_warm_boot(void);
+#endif
+
+#if defined(IMAGE_BL31)
+int prep_n_execute_warm_reset(void);
+int _soc_sys_warm_reset(void);
+#endif
+
+#endif	/* __ASSEMBLER__ */
+
+#endif	/* PLAT_WARM_RST_H */

plat/nxp/common/warm_reset/warm_reset.mk

@@ -0,0 +1,20 @@
+#
+# Copyright 2020 NXP
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+#-----------------------------------------------------------------------------
+ifeq (${WARM_RST_ADDED},)
+
+WARM_RST_ADDED	:=	1
+NXP_NV_SW_MAINT_LAST_EXEC_DATA := yes
+
+$(eval $(call add_define,NXP_WARM_BOOT))
+
+
+WARM_RST_INCLUDES	+=	-I${PLAT_COMMON_PATH}/warm_reset
+WARM_RST_BL31_SOURCES	+=	${PLAT_SOC_PATH}/$(ARCH)/${SOC}_warm_rst.S
+
+WARM_RST_BL_COMM_SOURCES	+=	${PLAT_COMMON_PATH}/warm_reset/plat_warm_reset.c
+
+endif