// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2020, Linaro Limited
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*/
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#include <common.h>
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#include <dm.h>
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#include <malloc.h>
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#include <scmi_agent.h>
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#include <scmi_agent-uclass.h>
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#include <scmi_protocols.h>
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#include <asm/io.h>
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#include <asm/scmi_test.h>
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#include <dm/device_compat.h>
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/*
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* The sandbox SCMI agent driver simulates to some extend a SCMI message
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* processing. It simulates few of the SCMI services for some of the
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* SCMI protocols embedded in U-Boot. Currently none.
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*
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* This driver simulates 2 SCMI agents for test purpose.
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*
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* This Driver exports sandbox_scmi_service_ct() for the test sequence to
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* get the state of the simulated services (clock state, rate, ...) and
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* check back-end device state reflects the request send through the
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* various uclass devices, currently nothing.
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*/
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#define SANDBOX_SCMI_AGENT_COUNT 2
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/* The list saves to simulted end devices references for test purpose */
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struct sandbox_scmi_agent *sandbox_scmi_agent_list[SANDBOX_SCMI_AGENT_COUNT];
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static struct sandbox_scmi_service sandbox_scmi_service_state = {
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.agent = sandbox_scmi_agent_list,
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.agent_count = SANDBOX_SCMI_AGENT_COUNT,
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};
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struct sandbox_scmi_service *sandbox_scmi_service_ctx(void)
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{
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return &sandbox_scmi_service_state;
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}
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static void debug_print_agent_state(struct udevice *dev, char *str)
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{
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struct sandbox_scmi_agent *agent = dev_get_priv(dev);
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dev_dbg(dev, "Dump sandbox_scmi_agent %u: %s\n", agent->idx, str);
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};
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static int sandbox_scmi_test_process_msg(struct udevice *dev,
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struct scmi_msg *msg)
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{
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switch (msg->protocol_id) {
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case SCMI_PROTOCOL_ID_BASE:
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case SCMI_PROTOCOL_ID_POWER_DOMAIN:
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case SCMI_PROTOCOL_ID_SYSTEM:
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case SCMI_PROTOCOL_ID_PERF:
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case SCMI_PROTOCOL_ID_CLOCK:
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case SCMI_PROTOCOL_ID_SENSOR:
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case SCMI_PROTOCOL_ID_RESET_DOMAIN:
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*(u32 *)msg->out_msg = SCMI_NOT_SUPPORTED;
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return 0;
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default:
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break;
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}
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dev_err(dev, "%s(%s): Unhandled protocol_id %#x/message_id %#x\n",
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__func__, dev->name, msg->protocol_id, msg->message_id);
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if (msg->out_msg_sz < sizeof(u32))
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return -EINVAL;
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/* Intentionnaly report unhandled IDs through the SCMI return code */
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*(u32 *)msg->out_msg = SCMI_PROTOCOL_ERROR;
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return 0;
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}
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static int sandbox_scmi_test_remove(struct udevice *dev)
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{
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struct sandbox_scmi_agent *agent = dev_get_priv(dev);
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debug_print_agent_state(dev, "removed");
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/* We only need to dereference the agent in the context */
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sandbox_scmi_service_ctx()->agent[agent->idx] = NULL;
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return 0;
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}
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static int sandbox_scmi_test_probe(struct udevice *dev)
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{
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static const char basename[] = "sandbox-scmi-agent@";
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struct sandbox_scmi_agent *agent = dev_get_priv(dev);
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const size_t basename_size = sizeof(basename) - 1;
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if (strncmp(basename, dev->name, basename_size))
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return -ENOENT;
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switch (dev->name[basename_size]) {
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case '0':
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*agent = (struct sandbox_scmi_agent){
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.idx = 0,
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};
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break;
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case '1':
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*agent = (struct sandbox_scmi_agent){
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.idx = 1,
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};
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break;
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default:
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dev_err(dev, "%s(): Unexpected agent ID %s\n",
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__func__, dev->name + basename_size);
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return -ENOENT;
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}
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debug_print_agent_state(dev, "probed");
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/* Save reference for tests purpose */
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sandbox_scmi_service_ctx()->agent[agent->idx] = agent;
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return 0;
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};
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static const struct udevice_id sandbox_scmi_test_ids[] = {
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{ .compatible = "sandbox,scmi-agent" },
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{ }
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};
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struct scmi_agent_ops sandbox_scmi_test_ops = {
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.process_msg = sandbox_scmi_test_process_msg,
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};
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U_BOOT_DRIVER(sandbox_scmi_agent) = {
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.name = "sandbox-scmi_agent",
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.id = UCLASS_SCMI_AGENT,
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.of_match = sandbox_scmi_test_ids,
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.priv_auto_alloc_size = sizeof(struct sandbox_scmi_agent),
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.probe = sandbox_scmi_test_probe,
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.remove = sandbox_scmi_test_remove,
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.ops = &sandbox_scmi_test_ops,
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};
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