CSS: Changes for SDS framework
This patch does the required changes to enable CSS platforms
to build and use the SDS framework. Since SDS is always coupled with
SCMI protocol, the preexisting SCMI build flag is now renamed to
`CSS_USE_SCMI_SDS_DRIVER` which will enable both SCMI and SDS on
CSS platforms. Also some of the workarounds applied for SCMI are
now removed with SDS in place.
Change-Id: I94e8b93f05e3fe95e475c5501c25bec052588a9c
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
diff --git a/plat/arm/css/drivers/scp/css_sds.c b/plat/arm/css/drivers/scp/css_sds.c
new file mode 100644
index 0000000..a7a51ba
--- /dev/null
+++ b/plat/arm/css/drivers/scp/css_sds.c
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2014-2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <css_def.h>
+#include <debug.h>
+#include <delay_timer.h>
+#include <platform.h>
+#include <stdint.h>
+#include "../sds/sds.h"
+
+int css_scp_boot_image_xfer(void *image, unsigned int image_size)
+{
+ int ret;
+ unsigned int image_offset, image_flags;
+
+ ret = sds_init();
+ if (ret != SDS_OK) {
+ ERROR("SCP SDS initialization failed\n");
+ panic();
+ }
+
+ VERBOSE("Writing SCP image metadata\n");
+ image_offset = (uintptr_t) image - ARM_TRUSTED_SRAM_BASE;
+ ret = sds_struct_write(SDS_SCP_IMG_STRUCT_ID, SDS_SCP_IMG_ADDR_OFFSET,
+ &image_offset, SDS_SCP_IMG_ADDR_SIZE,
+ SDS_ACCESS_MODE_NON_CACHED);
+ if (ret != SDS_OK)
+ goto sds_fail;
+
+ ret = sds_struct_write(SDS_SCP_IMG_STRUCT_ID, SDS_SCP_IMG_SIZE_OFFSET,
+ &image_size, SDS_SCP_IMG_SIZE_SIZE,
+ SDS_ACCESS_MODE_NON_CACHED);
+ if (ret != SDS_OK)
+ goto sds_fail;
+
+ VERBOSE("Marking SCP image metadata as valid\n");
+ image_flags = SDS_SCP_IMG_VALID_FLAG_BIT;
+ ret = sds_struct_write(SDS_SCP_IMG_STRUCT_ID, SDS_SCP_IMG_FLAG_OFFSET,
+ &image_flags, SDS_SCP_IMG_FLAG_SIZE,
+ SDS_ACCESS_MODE_NON_CACHED);
+ if (ret != SDS_OK)
+ goto sds_fail;
+
+ return 0;
+sds_fail:
+ ERROR("SCP SDS write to SCP IMG struct failed\n");
+ panic();
+}
+
+/*
+ * API to wait for SCP to signal till it's ready after booting the transferred
+ * image.
+ */
+int css_scp_boot_ready(void)
+{
+ uint32_t scp_feature_availability_flags;
+ int ret, retry = CSS_SCP_READY_10US_RETRIES;
+
+
+ VERBOSE("Waiting for SCP RAM to complete its initialization process\n");
+
+ /* Wait for the SCP RAM Firmware to complete its initialization process */
+ while (retry > 0) {
+ ret = sds_struct_read(SDS_FEATURE_AVAIL_STRUCT_ID, 0,
+ &scp_feature_availability_flags,
+ SDS_FEATURE_AVAIL_SIZE,
+ SDS_ACCESS_MODE_NON_CACHED);
+ if (ret == SDS_ERR_STRUCT_NOT_FINALIZED)
+ continue;
+
+ if (ret != SDS_OK) {
+ ERROR(" sds_struct_read failed\n");
+ panic();
+ }
+
+ if (scp_feature_availability_flags &
+ SDS_FEATURE_AVAIL_SCP_RAM_READY_BIT)
+ return 0;
+
+ udelay(10);
+ retry--;
+ }
+
+ ERROR("Timeout of %d ms expired waiting for SCP RAM Ready flag\n",
+ CSS_SCP_READY_10US_RETRIES/100);
+
+ plat_panic_handler();
+}