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/* Copyright 2023 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
* AP VDM control support
* Note: this is mutually exclusive with EC VDM control
*/
#include "builtin/assert.h"
#include "compile_time_macros.h"
#include "console.h"
#include "ec_commands.h"
#include "hooks.h"
#include "queue.h"
#include "system.h"
#include "task.h"
#include "tcpm/tcpm.h"
#include "temp_sensor.h"
#include "usb_pd.h"
#include "usb_pd_dpm_sm.h"
#include <stdbool.h>
#include <stdint.h>
#ifdef CONFIG_COMMON_RUNTIME
#define CPRINTF(format, args...) cprintf(CC_USBPD, format, ##args)
#define CPRINTS(format, args...) cprints(CC_USBPD, format, ##args)
#else
#define CPRINTF(format, args...)
#define CPRINTS(format, args...)
#endif
/*
* VDM:Attention queue for boards using AP-driven VDMs
*
* Depth must be a power of 2, which is normally enforced by the queue init
* code, but must be manually enforced here.
*/
#define DPM_ATTENTION_QUEUE_DEPTH 8
BUILD_ASSERT(POWER_OF_TWO(DPM_ATTENTION_QUEUE_DEPTH));
struct attention_queue_entry {
int objects;
uint32_t attention[PD_ATTENTION_MAX_VDO];
};
static struct {
uint32_t vdm_reply[VDO_MAX_SIZE];
uint8_t vdm_reply_cnt;
enum tcpci_msg_type vdm_reply_type;
struct queue attention_queue;
struct queue_state queue_state;
struct attention_queue_entry queue_buffer[DPM_ATTENTION_QUEUE_DEPTH];
mutex_t queue_lock;
} ap_storage[CONFIG_USB_PD_PORT_MAX_COUNT];
#ifdef CONFIG_ZEPHYR
static int init_ap_vdm_mutexes(const struct device *dev)
{
int port;
ARG_UNUSED(dev);
for (port = 0; port < CONFIG_USB_PD_PORT_MAX_COUNT; port++) {
k_mutex_init(&ap_storage[port].queue_lock);
}
return 0;
}
SYS_INIT(init_ap_vdm_mutexes, POST_KERNEL, 50);
#endif /* CONFIG_ZEPHYR */
static void init_attention_queue_structs(void)
{
int i;
for (i = 0; i < CONFIG_USB_PD_PORT_MAX_COUNT; i++) {
ap_storage[i].attention_queue.state =
&ap_storage[i].queue_state;
ap_storage[i].attention_queue.policy = &queue_policy_null;
ap_storage[i].attention_queue.buffer_units =
DPM_ATTENTION_QUEUE_DEPTH;
ap_storage[i].attention_queue.buffer_units_mask =
DPM_ATTENTION_QUEUE_DEPTH - 1;
ap_storage[i].attention_queue.unit_bytes =
sizeof(struct attention_queue_entry);
ap_storage[i].attention_queue.buffer =
(uint8_t *)&ap_storage[i].queue_buffer[0];
}
}
DECLARE_HOOK(HOOK_INIT, init_attention_queue_structs, HOOK_PRIO_FIRST);
void ap_vdm_attention_enqueue(int port, int length, uint32_t *buf)
{
struct attention_queue_entry new_entry;
new_entry.objects = length;
memcpy(new_entry.attention, buf, length * sizeof(uint32_t));
mutex_lock(&ap_storage[port].queue_lock);
/* If the queue is already full, discard the last entry */
if (queue_is_full(&ap_storage[port].attention_queue))
queue_advance_head(&ap_storage[port].attention_queue, 1);
/* Note: this should not happen, but log anyway */
if (queue_add_unit(&ap_storage[port].attention_queue, &new_entry) == 0)
CPRINTS("Error: Dropping port %d Attention", port);
else
pd_notify_event(port, PD_STATUS_EVENT_VDM_ATTENTION);
mutex_unlock(&ap_storage[port].queue_lock);
}
static uint8_t ap_vdm_attention_pop(int port, uint32_t *buf,
uint8_t *items_left)
{
int length = 0;
struct attention_queue_entry popped_entry;
mutex_lock(&ap_storage[port].queue_lock);
if (!queue_is_empty(&ap_storage[port].attention_queue)) {
queue_remove_unit(&ap_storage[port].attention_queue,
&popped_entry);
length = popped_entry.objects;
memcpy(buf, popped_entry.attention, length * sizeof(buf[0]));
}
*items_left = queue_count(&ap_storage[port].attention_queue);
mutex_unlock(&ap_storage[port].queue_lock);
return length;
}
void ap_vdm_init(int port)
{
/* Clear any stored AP messages */
ap_storage[port].vdm_reply_cnt = 0;
queue_init(&ap_storage[port].attention_queue);
}
void ap_vdm_acked(int port, enum tcpci_msg_type type, int vdo_count,
uint32_t *vdm)
{
assert(vdo_count >= 1);
assert(vdo_count <= VDO_MAX_SIZE);
/* Store and notify the AP */
ap_storage[port].vdm_reply_cnt = vdo_count;
memcpy(ap_storage[port].vdm_reply, vdm, vdo_count * sizeof(uint32_t));
ap_storage[port].vdm_reply_type = type;
pd_notify_event(port, PD_STATUS_EVENT_VDM_REQ_REPLY);
/* Clear the flag now that reply fields are updated */
dpm_clear_vdm_request(port);
}
void ap_vdm_naked(int port, enum tcpci_msg_type type, uint16_t svid,
uint8_t vdm_cmd, uint32_t vdm_header)
{
/* Store and notify the AP */
ap_storage[port].vdm_reply_type = type;
if (vdm_header != 0) {
ap_storage[port].vdm_reply_cnt = 1;
ap_storage[port].vdm_reply[0] = vdm_header;
pd_notify_event(port, PD_STATUS_EVENT_VDM_REQ_REPLY);
} else {
ap_storage[port].vdm_reply_cnt = 0;
pd_notify_event(port, PD_STATUS_EVENT_VDM_REQ_FAILED);
}
/* Clear the flag now that reply fields are updated */
dpm_clear_vdm_request(port);
}
static enum ec_status ap_vdm_copy_reply(int port, uint8_t *type, uint8_t *size,
uint32_t *buf)
{
if (dpm_check_vdm_request(port))
return EC_RES_BUSY;
if (ap_storage[port].vdm_reply_cnt == 0)
return EC_RES_UNAVAILABLE;
*type = ap_storage[port].vdm_reply_type;
*size = ap_storage[port].vdm_reply_cnt;
memcpy(buf, ap_storage[port].vdm_reply, *size * sizeof(uint32_t));
return EC_RES_SUCCESS;
}
/* Feature-specific host commands */
static enum ec_status hc_typec_vdm_response(struct host_cmd_handler_args *args)
{
const struct ec_params_typec_vdm_response *p = args->params;
struct ec_response_typec_vdm_response *r = args->response;
uint32_t data[VDO_MAX_SIZE];
if (p->port >= board_get_usb_pd_port_count())
return EC_RES_INVALID_PARAM;
if (args->response_max < sizeof(*r))
return EC_RES_RESPONSE_TOO_BIG;
args->response_size = sizeof(*r);
r->vdm_response_err = ap_vdm_copy_reply(p->port, &r->partner_type,
&r->vdm_data_objects, data);
if (r->vdm_data_objects > 0)
memcpy(r->vdm_response, data,
r->vdm_data_objects * sizeof(uint32_t));
r->vdm_attention_objects =
ap_vdm_attention_pop(p->port, data, &r->vdm_attention_left);
if (r->vdm_attention_objects > 0)
memcpy(r->vdm_attention, data,
r->vdm_attention_objects * sizeof(uint32_t));
return EC_RES_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_TYPEC_VDM_RESPONSE, hc_typec_vdm_response,
EC_VER_MASK(0));
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