1 files changed, 91 insertions, 0 deletions
diff --git a/plat/arm/css/common/css_bl2_setup.c b/plat/arm/css/common/css_bl2_setup.c
new file mode 100644
index 0000000..1e055c5
--- /dev/null
+++ b/plat/arm/css/common/css_bl2_setup.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (c) 2015-2023, Arm Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <string.h>
+
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <drivers/arm/css/css_scp.h>
+#include <lib/mmio.h>
+#include <lib/utils.h>
+#include <plat/arm/common/plat_arm.h>
+#include <platform_def.h>
+
+/* Weak definition may be overridden in specific CSS based platform */
+#pragma weak plat_arm_bl2_handle_scp_bl2
+
+/*******************************************************************************
+ * Transfer SCP_BL2 from Trusted RAM using the SCP Download protocol.
+ * Return 0 on success, -1 otherwise.
+ ******************************************************************************/
+int plat_arm_bl2_handle_scp_bl2(image_info_t *scp_bl2_image_info)
+{
+	int ret;
+
+	INFO("BL2: Initiating SCP_BL2 transfer to SCP\n");
+
+	ret = css_scp_boot_image_xfer((void *)scp_bl2_image_info->image_base,
+		scp_bl2_image_info->image_size);
+
+	if (ret == 0)
+		ret = css_scp_boot_ready();
+
+	if (ret == 0)
+		INFO("BL2: SCP_BL2 transferred to SCP\n");
+	else
+		ERROR("BL2: SCP_BL2 transfer failure\n");
+
+	return ret;
+}
+
+#if !CSS_USE_SCMI_SDS_DRIVER
+# if defined(EL3_PAYLOAD_BASE) || JUNO_AARCH32_EL3_RUNTIME
+
+/*
+ * We need to override some of the platform functions when booting an EL3
+ * payload or SP_MIN on Juno AArch32. This needs to be done only for
+ * SCPI/BOM SCP systems as in case of SDS, the structures remain in memory and
+ * don't need to be overwritten.
+ */
+
+static unsigned int scp_boot_config;
+
+void bl2_early_platform_setup2(u_register_t arg0, u_register_t arg1,
+			u_register_t arg2, u_register_t arg3)
+{
+	arm_bl2_early_platform_setup((uintptr_t)arg0, (meminfo_t *)arg1);
+
+	/* Save SCP Boot config before it gets overwritten by SCP_BL2 loading */
+	scp_boot_config = mmio_read_32(SCP_BOOT_CFG_ADDR);
+	VERBOSE("BL2: Saved SCP Boot config = 0x%x\n", scp_boot_config);
+}
+
+void bl2_platform_setup(void)
+{
+	arm_bl2_platform_setup();
+
+	/*
+	 * Before releasing the AP cores out of reset, the SCP writes some data
+	 * at the beginning of the Trusted SRAM. It is is overwritten before
+	 * reaching this function. We need to restore this data, as if the
+	 * target had just come out of reset. This implies:
+	 *  - zeroing the first 128 bytes of Trusted SRAM using zeromem instead
+	 *    of zero_normalmem since this is device memory.
+	 *  - restoring the SCP boot configuration.
+	 */
+	VERBOSE("BL2: Restoring SCP reset data in Trusted SRAM\n");
+	zeromem((void *) ARM_SHARED_RAM_BASE, 128);
+	mmio_write_32(SCP_BOOT_CFG_ADDR, scp_boot_config);
+}
+
+# endif /* EL3_PAYLOAD_BASE */
+
+#endif /* CSS_USE_SCMI_SDS_DRIVER */
+
+int bl2_plat_handle_post_image_load(unsigned int image_id)
+{
+	return arm_bl2_plat_handle_post_image_load(image_id);
+}