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/*
* Copyright 2020 Google LLC
*
* SPDX-License-Identifier: Apache-2.0
*
* This driver creates fake eSPI buses which can contain emulated devices
* (mainly host), implemented by a separate emulation driver.
* The API between this driver/controller and device emulators attached
* to its bus is defined by struct emul_espi_device_api.
*/
#define DT_DRV_COMPAT zephyr_espi_emul_controller
#define LOG_LEVEL CONFIG_ESPI_LOG_LEVEL
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(espi_emul_ctlr);
#include <zephyr/device.h>
#include <zephyr/drivers/emul.h>
#include <zephyr/drivers/espi.h>
#include <zephyr/drivers/espi_emul.h>
#include "espi_utils.h"
/** Working data for the controller */
struct espi_emul_data {
/* List of struct espi_emul associated with the device */
sys_slist_t emuls;
/* eSPI host configuration */
struct espi_cfg cfg;
/** List of eSPI callbacks */
sys_slist_t callbacks;
};
static struct espi_emul *espi_emul_find(const struct device *dev, unsigned int chipsel)
{
struct espi_emul_data *data = dev->data;
sys_snode_t *node;
SYS_SLIST_FOR_EACH_NODE(&data->emuls, node) {
struct espi_emul *emul;
emul = CONTAINER_OF(node, struct espi_emul, node);
if (emul->chipsel == chipsel) {
return emul;
}
}
return NULL;
}
static int espi_emul_config(const struct device *dev, struct espi_cfg *cfg)
{
struct espi_emul_data *data = dev->data;
__ASSERT_NO_MSG(cfg);
data->cfg = *cfg;
return 0;
}
static int emul_espi_trigger_event(const struct device *dev, struct espi_event *evt)
{
struct espi_emul_data *data = dev->data;
if (((evt->evt_type & ESPI_BUS_EVENT_VWIRE_RECEIVED) &&
!(data->cfg.channel_caps & ESPI_CHANNEL_VWIRE)) ||
((evt->evt_type & ESPI_BUS_EVENT_OOB_RECEIVED) &&
!(data->cfg.channel_caps & ESPI_CHANNEL_OOB)) ||
((evt->evt_type & ESPI_BUS_PERIPHERAL_NOTIFICATION) &&
!(data->cfg.channel_caps & ESPI_CHANNEL_PERIPHERAL))) {
return -EIO;
}
espi_send_callbacks(&data->callbacks, dev, *evt);
return 0;
}
static bool espi_emul_get_channel_status(const struct device *dev, enum espi_channel ch)
{
struct espi_emul_data *data = dev->data;
return (data->cfg.channel_caps & ch);
}
static int espi_emul_read_lpc_request(const struct device *dev, enum lpc_peripheral_opcode op,
uint32_t *data)
{
const struct emul_espi_device_api *api;
struct espi_emul *emul;
struct espi_emul_data *emul_data = dev->data;
ARG_UNUSED(data);
if (!(emul_data->cfg.channel_caps & ESPI_CHANNEL_VWIRE)) {
LOG_ERR("bad channel vwire");
return -EINVAL;
}
emul = espi_emul_find(dev, EMUL_ESPI_HOST_CHIPSEL);
if (!emul) {
LOG_ERR("espi_emul not found");
return -ENOTSUP;
}
__ASSERT_NO_MSG(emul->api);
api = emul->api;
switch (op) {
#ifdef CONFIG_ESPI_PERIPHERAL_ACPI_SHM_REGION
case EACPI_GET_SHARED_MEMORY:
__ASSERT_NO_MSG(api->get_acpi_shm);
*data = (uint32_t)api->get_acpi_shm(emul->target);
break;
#endif
default:
return -EINVAL;
}
return 0;
}
static int espi_emul_write_lpc_request(const struct device *dev, enum lpc_peripheral_opcode op,
uint32_t *data)
{
ARG_UNUSED(dev);
ARG_UNUSED(op);
ARG_UNUSED(data);
return -EINVAL;
}
static int espi_emul_send_vwire(const struct device *dev, enum espi_vwire_signal vw, uint8_t level)
{
const struct emul_espi_device_api *api;
struct espi_emul *emul;
struct espi_emul_data *data = dev->data;
if (!(data->cfg.channel_caps & ESPI_CHANNEL_VWIRE)) {
return -EIO;
}
emul = espi_emul_find(dev, EMUL_ESPI_HOST_CHIPSEL);
if (!emul) {
LOG_DBG("espi_emul not found");
return -EIO;
}
__ASSERT_NO_MSG(emul->api);
__ASSERT_NO_MSG(emul->api->set_vw);
api = emul->api;
return api->set_vw(emul->target, vw, level);
}
static int espi_emul_receive_vwire(const struct device *dev, enum espi_vwire_signal vw,
uint8_t *level)
{
const struct emul_espi_device_api *api;
struct espi_emul *emul;
struct espi_emul_data *data = dev->data;
if (!(data->cfg.channel_caps & ESPI_CHANNEL_VWIRE)) {
return -EIO;
}
emul = espi_emul_find(dev, EMUL_ESPI_HOST_CHIPSEL);
if (!emul) {
LOG_INF("espi_emul not found");
return -EIO;
}
__ASSERT_NO_MSG(emul->api);
__ASSERT_NO_MSG(emul->api->get_vw);
api = emul->api;
return api->get_vw(emul->target, vw, level);
}
static int espi_emul_manage_callback(const struct device *dev, struct espi_callback *callback,
bool set)
{
struct espi_emul_data *data = dev->data;
return espi_manage_callback(&data->callbacks, callback, set);
}
/**
* Set up a new emulator and add it to the list
*
* @param dev eSPI emulation controller device
*/
static int espi_emul_init(const struct device *dev)
{
struct espi_emul_data *data = dev->data;
sys_slist_init(&data->emuls);
return emul_init_for_bus(dev);
}
int espi_emul_register(const struct device *dev, struct espi_emul *emul)
{
struct espi_emul_data *data = dev->data;
const char *name = emul->target->dev->name;
sys_slist_append(&data->emuls, &emul->node);
LOG_INF("Register emulator '%s' at cs %u\n", name, emul->chipsel);
return 0;
}
/* Device instantiation */
static struct emul_espi_driver_api emul_espi_driver_api = {
.espi_api = {
.config = espi_emul_config,
.get_channel_status = espi_emul_get_channel_status,
.read_lpc_request = espi_emul_read_lpc_request,
.write_lpc_request = espi_emul_write_lpc_request,
.send_vwire = espi_emul_send_vwire,
.receive_vwire = espi_emul_receive_vwire,
.manage_callback = espi_emul_manage_callback
},
.trigger_event = emul_espi_trigger_event,
.find_emul = espi_emul_find,
};
#define EMUL_LINK_AND_COMMA(node_id) \
{ \
.dev = DEVICE_DT_GET(node_id), \
},
#define ESPI_EMUL_INIT(n) \
static const struct emul_link_for_bus emuls_##n[] = { DT_FOREACH_CHILD( \
DT_DRV_INST(n), EMUL_LINK_AND_COMMA) }; \
static struct emul_list_for_bus espi_emul_cfg_##n = { \
.children = emuls_##n, \
.num_children = ARRAY_SIZE(emuls_##n), \
}; \
static struct espi_emul_data espi_emul_data_##n; \
DEVICE_DT_INST_DEFINE(n, &espi_emul_init, NULL, &espi_emul_data_##n, &espi_emul_cfg_##n, \
POST_KERNEL, CONFIG_ESPI_INIT_PRIORITY, &emul_espi_driver_api);
DT_INST_FOREACH_STATUS_OKAY(ESPI_EMUL_INIT)