1 files changed, 122 insertions, 0 deletions
diff --git a/plat/arm/board/juno/juno_bl1_setup.c b/plat/arm/board/juno/juno_bl1_setup.c
new file mode 100644
index 0000000..a9d5cc3
--- /dev/null
+++ b/plat/arm/board/juno/juno_bl1_setup.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2015-2021, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <errno.h>
+
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <common/tbbr/tbbr_img_def.h>
+#include <drivers/arm/css/sds.h>
+#include <drivers/arm/sp805.h>
+#include <plat/arm/common/plat_arm.h>
+#include <plat/arm/common/arm_def.h>
+#include <plat/common/platform.h>
+#include <platform_def.h>
+
+void juno_reset_to_aarch32_state(void);
+
+static int is_watchdog_reset(void)
+{
+#if !CSS_USE_SCMI_SDS_DRIVER
+	#define RESET_REASON_WDOG_RESET		(0x2)
+	const uint32_t *reset_flags_ptr = (const uint32_t *)SSC_GPRETN;
+
+	if ((*reset_flags_ptr & RESET_REASON_WDOG_RESET) != 0)
+		return 1;
+
+	return 0;
+#else
+	int ret;
+	uint32_t scp_reset_synd_flags;
+
+	ret = sds_init();
+	if (ret != SDS_OK) {
+		ERROR("SCP SDS initialization failed\n");
+		panic();
+	}
+
+	ret = sds_struct_read(SDS_RESET_SYNDROME_STRUCT_ID,
+					SDS_RESET_SYNDROME_OFFSET,
+					&scp_reset_synd_flags,
+					SDS_RESET_SYNDROME_SIZE,
+					SDS_ACCESS_MODE_NON_CACHED);
+	if (ret != SDS_OK) {
+		ERROR("Getting reset reason from SDS failed\n");
+		panic();
+	}
+
+	/* Check if the WATCHDOG_RESET_BIT is set in the reset syndrome */
+	if (scp_reset_synd_flags & SDS_RESET_SYNDROME_AP_WD_RESET_BIT)
+		return 1;
+
+	return 0;
+#endif
+}
+
+/*******************************************************************************
+ * The following function checks if Firmware update is needed,
+ * by checking if TOC in FIP image is valid or watchdog reset happened.
+ ******************************************************************************/
+bool plat_arm_bl1_fwu_needed(void)
+{
+	int32_t nv_flags = (int32_t)mmio_read_32(V2M_SYS_NVFLAGS_ADDR);
+
+	/* Check if TOC is invalid or watchdog reset happened. */
+	return (!arm_io_is_toc_valid() || (((nv_flags == -EAUTH) ||
+		(nv_flags == -ENOENT)) && is_watchdog_reset()));
+}
+
+/*******************************************************************************
+ * On JUNO update the arg2 with address of SCP_BL2U image info.
+ ******************************************************************************/
+void bl1_plat_set_ep_info(unsigned int image_id,
+		entry_point_info_t *ep_info)
+{
+	if (image_id == BL2U_IMAGE_ID) {
+		image_desc_t *image_desc = bl1_plat_get_image_desc(SCP_BL2U_IMAGE_ID);
+		ep_info->args.arg2 = (unsigned long)&image_desc->image_info;
+	}
+}
+
+/*******************************************************************************
+ * On Juno clear SYS_NVFLAGS and wait for watchdog reset.
+ ******************************************************************************/
+__dead2 void bl1_plat_fwu_done(void *client_cookie, void *reserved)
+{
+	uint32_t nv_flags = mmio_read_32(V2M_SYS_NVFLAGS_ADDR);
+
+	/* Clear the NV flags register. */
+	mmio_write_32((V2M_SYSREGS_BASE + V2M_SYS_NVFLAGSCLR),
+		      nv_flags);
+
+	/* Setup the watchdog to reset the system as soon as possible */
+	sp805_refresh(ARM_SP805_TWDG_BASE, 1U);
+
+	while (true)
+		wfi();
+}
+
+#if JUNO_AARCH32_EL3_RUNTIME
+void bl1_plat_prepare_exit(entry_point_info_t *ep_info)
+{
+#if !ARM_DISABLE_TRUSTED_WDOG
+	/* Disable watchdog before leaving BL1 */
+	sp805_stop(ARM_SP805_TWDG_BASE);
+#endif
+
+	juno_reset_to_aarch32_state();
+}
+#endif /* JUNO_AARCH32_EL3_RUNTIME */
+
+void plat_arm_secure_wdt_start(void)
+{
+	sp805_start(ARM_SP805_TWDG_BASE, ARM_TWDG_LOAD_VAL);
+}
+
+void plat_arm_secure_wdt_stop(void)
+{
+	sp805_stop(ARM_SP805_TWDG_BASE);
+}