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// SPDX-License-Identifier: BSD-3-Clause
/*
* Copyright (c) 2015-2019, Arm Limited and Contributors. All rights reserved.
* Copyright (c) 2019-2022, 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;
}
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,
};
const uint8_t *list = NULL;
unsigned int count = 0U;
if (msg->in_size != sizeof(*a2p)) {
scmi_status_response(msg, SCMI_PROTOCOL_ERROR);
return;
}
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, msg->out_size - sizeof(p2a));
} else {
count = 0U;
}
p2a.num_protocols = count;
memcpy(msg->out, &p2a, sizeof(p2a));
memcpy(msg->out + sizeof(p2a), list + a2p->skip, count);
msg->out_size_out = sizeof(p2a) + round_up(count, sizeof(uint32_t));
}
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];
}
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