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Diffstat (limited to 'drivers/scmi-msg/base.c')
-rw-r--r--drivers/scmi-msg/base.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/scmi-msg/base.c b/drivers/scmi-msg/base.c
new file mode 100644
index 0000000000..2d7203451f
--- /dev/null
+++ b/drivers/scmi-msg/base.c
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) 2015-2019, Arm Limited and Contributors. All rights reserved.
+ * Copyright (c) 2019-2020, Linaro Limited
+ */
+#include <assert.h>
+#include <string.h>
+
+#include <drivers/scmi-msg.h>
+#include <drivers/scmi.h>
+#include <lib/utils.h>
+#include <lib/utils_def.h>
+
+#include "common.h"
+
+static bool message_id_is_supported(unsigned int message_id);
+
+static void report_version(struct scmi_msg *msg)
+{
+ struct scmi_protocol_version_p2a return_values = {
+ .status = SCMI_SUCCESS,
+ .version = SCMI_PROTOCOL_VERSION_BASE,
+ };
+
+ if (msg->in_size != 0U) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ scmi_write_response(msg, &return_values, sizeof(return_values));
+}
+
+static void report_attributes(struct scmi_msg *msg)
+{
+ size_t protocol_count = plat_scmi_protocol_count();
+ struct scmi_protocol_attributes_p2a return_values = {
+ .status = SCMI_SUCCESS,
+ /* Null agent count since agent discovery is not supported */
+ .attributes = SCMI_BASE_PROTOCOL_ATTRIBUTES(protocol_count, 0U),
+ };
+
+ if (msg->in_size != 0U) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ scmi_write_response(msg, &return_values, sizeof(return_values));
+}
+
+static void report_message_attributes(struct scmi_msg *msg)
+{
+ struct scmi_protocol_message_attributes_a2p *in_args = (void *)msg->in;
+ struct scmi_protocol_message_attributes_p2a return_values = {
+ .status = SCMI_SUCCESS,
+ /* For this protocol, attributes shall be zero */
+ .attributes = 0U,
+ };
+
+ if (msg->in_size != sizeof(*in_args)) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ if (!message_id_is_supported(in_args->message_id)) {
+ scmi_status_response(msg, SCMI_NOT_FOUND);
+ return;
+ }
+
+ scmi_write_response(msg, &return_values, sizeof(return_values));
+}
+
+static void discover_vendor(struct scmi_msg *msg)
+{
+ const char *name = plat_scmi_vendor_name();
+ struct scmi_base_discover_vendor_p2a return_values = {
+ .status = SCMI_SUCCESS,
+ };
+
+ if (msg->in_size != 0U) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ COPY_NAME_IDENTIFIER(return_values.vendor_identifier, name);
+
+ scmi_write_response(msg, &return_values, sizeof(return_values));
+}
+
+static void discover_sub_vendor(struct scmi_msg *msg)
+{
+ const char *name = plat_scmi_sub_vendor_name();
+ struct scmi_base_discover_sub_vendor_p2a return_values = {
+ .status = SCMI_SUCCESS,
+ };
+
+ if (msg->in_size != 0U) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ COPY_NAME_IDENTIFIER(return_values.sub_vendor_identifier, name);
+
+ scmi_write_response(msg, &return_values, sizeof(return_values));
+}
+
+static void discover_implementation_version(struct scmi_msg *msg)
+{
+ struct scmi_protocol_version_p2a return_values = {
+ .status = SCMI_SUCCESS,
+ .version = SCMI_IMPL_VERSION,
+ };
+
+ if (msg->in_size != 0U) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ scmi_write_response(msg, &return_values, sizeof(return_values));
+}
+
+static unsigned int count_protocols_in_list(const uint8_t *protocol_list)
+{
+ unsigned int count = 0U;
+
+ if (protocol_list != NULL) {
+ while (protocol_list[count] != 0U) {
+ count++;
+ }
+ }
+
+ return count;
+}
+
+#define MAX_PROTOCOL_IN_LIST 8U
+
+static void discover_list_protocols(struct scmi_msg *msg)
+{
+ const struct scmi_base_discover_list_protocols_a2p *a2p = NULL;
+ struct scmi_base_discover_list_protocols_p2a p2a = {
+ .status = SCMI_SUCCESS,
+ };
+ uint8_t outargs[sizeof(p2a) + MAX_PROTOCOL_IN_LIST] = { 0U };
+ const uint8_t *list = NULL;
+ unsigned int count = 0U;
+
+ if (msg->in_size != sizeof(*a2p)) {
+ scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
+ return;
+ }
+
+ assert(msg->out_size > sizeof(outargs));
+
+ a2p = (void *)msg->in;
+
+ list = plat_scmi_protocol_list(msg->agent_id);
+ count = count_protocols_in_list(list);
+ if (count > a2p->skip) {
+ count = MIN(count - a2p->skip, MAX_PROTOCOL_IN_LIST);
+ } else {
+ count = 0U;
+ }
+
+ p2a.num_protocols = count;
+
+ memcpy(outargs, &p2a, sizeof(p2a));
+ memcpy(outargs + sizeof(p2a), list + a2p->skip, count);
+
+ scmi_write_response(msg, outargs, sizeof(outargs));
+}
+
+static const scmi_msg_handler_t scmi_base_handler_table[] = {
+ [SCMI_PROTOCOL_VERSION] = report_version,
+ [SCMI_PROTOCOL_ATTRIBUTES] = report_attributes,
+ [SCMI_PROTOCOL_MESSAGE_ATTRIBUTES] = report_message_attributes,
+ [SCMI_BASE_DISCOVER_VENDOR] = discover_vendor,
+ [SCMI_BASE_DISCOVER_SUB_VENDOR] = discover_sub_vendor,
+ [SCMI_BASE_DISCOVER_IMPLEMENTATION_VERSION] =
+ discover_implementation_version,
+ [SCMI_BASE_DISCOVER_LIST_PROTOCOLS] = discover_list_protocols,
+};
+
+static bool message_id_is_supported(unsigned int message_id)
+{
+ return (message_id < ARRAY_SIZE(scmi_base_handler_table)) &&
+ (scmi_base_handler_table[message_id] != NULL);
+}
+
+scmi_msg_handler_t scmi_msg_get_base_handler(struct scmi_msg *msg)
+{
+ unsigned int message_id = SPECULATION_SAFE_VALUE(msg->message_id);
+
+ if (message_id >= ARRAY_SIZE(scmi_base_handler_table)) {
+ VERBOSE("Base handle not found %u\n", msg->message_id);
+ return NULL;
+ }
+
+ return scmi_base_handler_table[message_id];
+}