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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2020, Linaro Limited
*/
#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <scmi_agent.h>
#include <scmi_agent-uclass.h>
#include <scmi_protocols.h>
#include <asm/io.h>
#include <asm/scmi_test.h>
#include <dm/device_compat.h>
/*
* The sandbox SCMI agent driver simulates to some extend a SCMI message
* processing. It simulates few of the SCMI services for some of the
* SCMI protocols embedded in U-Boot. Currently:
* - SCMI clock protocol: emulate 2 agents each exposing few clocks
* - SCMI reset protocol: emulate 1 agents each exposing a reset
*
* Agent #0 simulates 2 clocks and 1 reset domain.
* See IDs in scmi0_clk[]/scmi0_reset[] and "sandbox-scmi-agent@0" in test.dts.
*
* Agent #1 simulates 1 clock.
* See IDs in scmi1_clk[] and "sandbox-scmi-agent@1" in test.dts.
*
* All clocks are default disabled and reset levels down.
*
* This Driver exports sandbox_scmi_service_ct() for the test sequence to
* get the state of the simulated services (clock state, rate, ...) and
* check back-end device state reflects the request send through the
* various uclass devices, as clocks and reset controllers.
*/
#define SANDBOX_SCMI_AGENT_COUNT 2
static struct sandbox_scmi_clk scmi0_clk[] = {
{ .id = 7, .rate = 1000 },
{ .id = 3, .rate = 333 },
};
static struct sandbox_scmi_reset scmi0_reset[] = {
{ .id = 3 },
};
static struct sandbox_scmi_clk scmi1_clk[] = {
{ .id = 1, .rate = 44 },
};
/* The list saves to simulted end devices references for test purpose */
struct sandbox_scmi_agent *sandbox_scmi_agent_list[SANDBOX_SCMI_AGENT_COUNT];
static struct sandbox_scmi_service sandbox_scmi_service_state = {
.agent = sandbox_scmi_agent_list,
.agent_count = SANDBOX_SCMI_AGENT_COUNT,
};
struct sandbox_scmi_service *sandbox_scmi_service_ctx(void)
{
return &sandbox_scmi_service_state;
}
static void debug_print_agent_state(struct udevice *dev, char *str)
{
struct sandbox_scmi_agent *agent = dev_get_priv(dev);
dev_dbg(dev, "Dump sandbox_scmi_agent %u: %s\n", agent->idx, str);
dev_dbg(dev, " scmi%u_clk (%zu): %d/%ld, %d/%ld, %d/%ld, ...\n",
agent->idx,
agent->clk_count,
agent->clk_count ? agent->clk[0].enabled : -1,
agent->clk_count ? agent->clk[0].rate : -1,
agent->clk_count > 1 ? agent->clk[1].enabled : -1,
agent->clk_count > 1 ? agent->clk[1].rate : -1,
agent->clk_count > 2 ? agent->clk[2].enabled : -1,
agent->clk_count > 2 ? agent->clk[2].rate : -1);
dev_dbg(dev, " scmi%u_reset (%zu): %d, %d, ...\n",
agent->idx,
agent->reset_count,
agent->reset_count ? agent->reset[0].asserted : -1,
agent->reset_count > 1 ? agent->reset[1].asserted : -1);
};
static struct sandbox_scmi_clk *get_scmi_clk_state(uint agent_id, uint clock_id)
{
struct sandbox_scmi_clk *target = NULL;
size_t target_count = 0;
size_t n;
switch (agent_id) {
case 0:
target = scmi0_clk;
target_count = ARRAY_SIZE(scmi0_clk);
break;
case 1:
target = scmi1_clk;
target_count = ARRAY_SIZE(scmi1_clk);
break;
default:
return NULL;
}
for (n = 0; n < target_count; n++)
if (target[n].id == clock_id)
return target + n;
return NULL;
}
static struct sandbox_scmi_reset *get_scmi_reset_state(uint agent_id,
uint reset_id)
{
size_t n;
if (agent_id == 0) {
for (n = 0; n < ARRAY_SIZE(scmi0_reset); n++)
if (scmi0_reset[n].id == reset_id)
return scmi0_reset + n;
}
return NULL;
}
/*
* Sandbox SCMI agent ops
*/
static int sandbox_scmi_clock_rate_set(struct udevice *dev,
struct scmi_msg *msg)
{
struct sandbox_scmi_agent *agent = dev_get_priv(dev);
struct scmi_clk_rate_set_in *in = NULL;
struct scmi_clk_rate_set_out *out = NULL;
struct sandbox_scmi_clk *clk_state = NULL;
if (!msg->in_msg || msg->in_msg_sz < sizeof(*in) ||
!msg->out_msg || msg->out_msg_sz < sizeof(*out))
return -EINVAL;
in = (struct scmi_clk_rate_set_in *)msg->in_msg;
out = (struct scmi_clk_rate_set_out *)msg->out_msg;
clk_state = get_scmi_clk_state(agent->idx, in->clock_id);
if (!clk_state) {
dev_err(dev, "Unexpected clock ID %u\n", in->clock_id);
out->status = SCMI_NOT_FOUND;
} else {
u64 rate = ((u64)in->rate_msb << 32) + in->rate_lsb;
clk_state->rate = (ulong)rate;
out->status = SCMI_SUCCESS;
}
return 0;
}
static int sandbox_scmi_clock_rate_get(struct udevice *dev,
struct scmi_msg *msg)
{
struct sandbox_scmi_agent *agent = dev_get_priv(dev);
struct scmi_clk_rate_get_in *in = NULL;
struct scmi_clk_rate_get_out *out = NULL;
struct sandbox_scmi_clk *clk_state = NULL;
if (!msg->in_msg || msg->in_msg_sz < sizeof(*in) ||
!msg->out_msg || msg->out_msg_sz < sizeof(*out))
return -EINVAL;
in = (struct scmi_clk_rate_get_in *)msg->in_msg;
out = (struct scmi_clk_rate_get_out *)msg->out_msg;
clk_state = get_scmi_clk_state(agent->idx, in->clock_id);
if (!clk_state) {
dev_err(dev, "Unexpected clock ID %u\n", in->clock_id);
out->status = SCMI_NOT_FOUND;
} else {
out->rate_msb = (u32)((u64)clk_state->rate >> 32);
out->rate_lsb = (u32)clk_state->rate;
out->status = SCMI_SUCCESS;
}
return 0;
}
static int sandbox_scmi_clock_gate(struct udevice *dev, struct scmi_msg *msg)
{
struct sandbox_scmi_agent *agent = dev_get_priv(dev);
struct scmi_clk_state_in *in = NULL;
struct scmi_clk_state_out *out = NULL;
struct sandbox_scmi_clk *clk_state = NULL;
if (!msg->in_msg || msg->in_msg_sz < sizeof(*in) ||
!msg->out_msg || msg->out_msg_sz < sizeof(*out))
return -EINVAL;
in = (struct scmi_clk_state_in *)msg->in_msg;
out = (struct scmi_clk_state_out *)msg->out_msg;
clk_state = get_scmi_clk_state(agent->idx, in->clock_id);
if (!clk_state) {
dev_err(dev, "Unexpected clock ID %u\n", in->clock_id);
out->status = SCMI_NOT_FOUND;
} else if (in->attributes > 1) {
out->status = SCMI_PROTOCOL_ERROR;
} else {
clk_state->enabled = in->attributes;
out->status = SCMI_SUCCESS;
}
return 0;
}
static int sandbox_scmi_rd_attribs(struct udevice *dev, struct scmi_msg *msg)
{
struct sandbox_scmi_agent *agent = dev_get_priv(dev);
struct scmi_rd_attr_in *in = NULL;
struct scmi_rd_attr_out *out = NULL;
struct sandbox_scmi_reset *reset_state = NULL;
if (!msg->in_msg || msg->in_msg_sz < sizeof(*in) ||
!msg->out_msg || msg->out_msg_sz < sizeof(*out))
return -EINVAL;
in = (struct scmi_rd_attr_in *)msg->in_msg;
out = (struct scmi_rd_attr_out *)msg->out_msg;
reset_state = get_scmi_reset_state(agent->idx, in->domain_id);
if (!reset_state) {
dev_err(dev, "Unexpected reset domain ID %u\n", in->domain_id);
out->status = SCMI_NOT_FOUND;
} else {
memset(out, 0, sizeof(*out));
snprintf(out->name, sizeof(out->name), "rd%u", in->domain_id);
out->status = SCMI_SUCCESS;
}
return 0;
}
static int sandbox_scmi_rd_reset(struct udevice *dev, struct scmi_msg *msg)
{
struct sandbox_scmi_agent *agent = dev_get_priv(dev);
struct scmi_rd_reset_in *in = NULL;
struct scmi_rd_reset_out *out = NULL;
struct sandbox_scmi_reset *reset_state = NULL;
if (!msg->in_msg || msg->in_msg_sz < sizeof(*in) ||
!msg->out_msg || msg->out_msg_sz < sizeof(*out))
return -EINVAL;
in = (struct scmi_rd_reset_in *)msg->in_msg;
out = (struct scmi_rd_reset_out *)msg->out_msg;
reset_state = get_scmi_reset_state(agent->idx, in->domain_id);
if (!reset_state) {
dev_err(dev, "Unexpected reset domain ID %u\n", in->domain_id);
out->status = SCMI_NOT_FOUND;
} else if (in->reset_state > 1) {
dev_err(dev, "Invalid reset domain input attribute value\n");
out->status = SCMI_INVALID_PARAMETERS;
} else {
if (in->flags & SCMI_RD_RESET_FLAG_CYCLE) {
if (in->flags & SCMI_RD_RESET_FLAG_ASYNC) {
out->status = SCMI_NOT_SUPPORTED;
} else {
/* Ends deasserted whatever current state */
reset_state->asserted = false;
out->status = SCMI_SUCCESS;
}
} else {
reset_state->asserted = in->flags &
SCMI_RD_RESET_FLAG_ASSERT;
out->status = SCMI_SUCCESS;
}
}
return 0;
}
static int sandbox_scmi_test_process_msg(struct udevice *dev,
struct scmi_msg *msg)
{
switch (msg->protocol_id) {
case SCMI_PROTOCOL_ID_CLOCK:
switch (msg->message_id) {
case SCMI_CLOCK_RATE_SET:
return sandbox_scmi_clock_rate_set(dev, msg);
case SCMI_CLOCK_RATE_GET:
return sandbox_scmi_clock_rate_get(dev, msg);
case SCMI_CLOCK_CONFIG_SET:
return sandbox_scmi_clock_gate(dev, msg);
default:
break;
}
break;
case SCMI_PROTOCOL_ID_RESET_DOMAIN:
switch (msg->message_id) {
case SCMI_RESET_DOMAIN_ATTRIBUTES:
return sandbox_scmi_rd_attribs(dev, msg);
case SCMI_RESET_DOMAIN_RESET:
return sandbox_scmi_rd_reset(dev, msg);
default:
break;
}
break;
case SCMI_PROTOCOL_ID_BASE:
case SCMI_PROTOCOL_ID_POWER_DOMAIN:
case SCMI_PROTOCOL_ID_SYSTEM:
case SCMI_PROTOCOL_ID_PERF:
case SCMI_PROTOCOL_ID_SENSOR:
*(u32 *)msg->out_msg = SCMI_NOT_SUPPORTED;
return 0;
default:
break;
}
dev_err(dev, "%s(%s): Unhandled protocol_id %#x/message_id %#x\n",
__func__, dev->name, msg->protocol_id, msg->message_id);
if (msg->out_msg_sz < sizeof(u32))
return -EINVAL;
/* Intentionnaly report unhandled IDs through the SCMI return code */
*(u32 *)msg->out_msg = SCMI_PROTOCOL_ERROR;
return 0;
}
static int sandbox_scmi_test_remove(struct udevice *dev)
{
struct sandbox_scmi_agent *agent = dev_get_priv(dev);
debug_print_agent_state(dev, "removed");
/* We only need to dereference the agent in the context */
sandbox_scmi_service_ctx()->agent[agent->idx] = NULL;
return 0;
}
static int sandbox_scmi_test_probe(struct udevice *dev)
{
static const char basename[] = "sandbox-scmi-agent@";
struct sandbox_scmi_agent *agent = dev_get_priv(dev);
const size_t basename_size = sizeof(basename) - 1;
if (strncmp(basename, dev->name, basename_size))
return -ENOENT;
switch (dev->name[basename_size]) {
case '0':
*agent = (struct sandbox_scmi_agent){
.idx = 0,
.clk = scmi0_clk,
.clk_count = ARRAY_SIZE(scmi0_clk),
.reset = scmi0_reset,
.reset_count = ARRAY_SIZE(scmi0_reset),
};
break;
case '1':
*agent = (struct sandbox_scmi_agent){
.idx = 1,
.clk = scmi1_clk,
.clk_count = ARRAY_SIZE(scmi1_clk),
};
break;
default:
dev_err(dev, "%s(): Unexpected agent ID %s\n",
__func__, dev->name + basename_size);
return -ENOENT;
}
debug_print_agent_state(dev, "probed");
/* Save reference for tests purpose */
sandbox_scmi_service_ctx()->agent[agent->idx] = agent;
return 0;
};
static const struct udevice_id sandbox_scmi_test_ids[] = {
{ .compatible = "sandbox,scmi-agent" },
{ }
};
struct scmi_agent_ops sandbox_scmi_test_ops = {
.process_msg = sandbox_scmi_test_process_msg,
};
U_BOOT_DRIVER(sandbox_scmi_agent) = {
.name = "sandbox-scmi_agent",
.id = UCLASS_SCMI_AGENT,
.of_match = sandbox_scmi_test_ids,
.priv_auto = sizeof(struct sandbox_scmi_agent),
.probe = sandbox_scmi_test_probe,
.remove = sandbox_scmi_test_remove,
.ops = &sandbox_scmi_test_ops,
};