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/* Copyright 2019 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "common.h"
#include "console.h"
#include "heci_client.h"
#include "host_command.h"
#include "host_command_heci.h"
#include "ipc_heci.h"
#include "util.h"
#define CPUTS(outstr) cputs(CC_LPC, outstr)
#define CPRINTS(format, args...) cprints(CC_LPC, format, ## args)
#define CPRINTF(format, args...) cprintf(CC_LPC, format, ## args)
#define HECI_CLIENT_CROS_EC_ISH_GUID { 0x7b7154d0, 0x56f4, 0x4bdc,\
{ 0xb0, 0xd8, 0x9e, 0x7c, 0xda, 0xe0, 0xd6, 0xa0 } }
/* Handle for all heci cros_ec interactions */
static heci_handle_t heci_cros_ec_handle = HECI_INVALID_HANDLE;
/*
* If we hit response buffer size issues, we can increase this. This is the
* current size of a single HECI packet.
*
* Aligning with other assumptions in host command stack, only a single host
* command can be processed at a given time.
*/
struct cros_ec_ishtp_msg_hdr {
uint8_t channel;
uint8_t status;
uint8_t reserved[2];
} __ec_align4;
#define CROS_EC_ISHTP_MSG_HDR_SIZE sizeof(struct cros_ec_ishtp_msg_hdr)
#define HECI_CROS_EC_RESPONSE_MAX \
(IPC_MAX_PAYLOAD_SIZE - CROS_EC_ISHTP_MSG_HDR_SIZE)
struct cros_ec_ishtp_msg {
struct cros_ec_ishtp_msg_hdr hdr;
uint8_t data[0];
} __ec_align4;
enum heci_cros_ec_channel {
CROS_EC_COMMAND = 1, /* initiated from AP */
CROS_MKBP_EVENT = 2, /* initiated from EC */
};
static uint8_t response_buffer[IPC_MAX_PAYLOAD_SIZE] __aligned(4);
static struct host_packet heci_packet;
void heci_send_mkbp_event(void)
{
struct cros_ec_ishtp_msg evt;
evt.hdr.channel = CROS_MKBP_EVENT;
evt.hdr.status = 0;
heci_send_msg(heci_cros_ec_handle, (uint8_t *)&evt, sizeof(evt));
}
static void heci_send_hostcmd_response(struct host_packet *pkt)
{
struct cros_ec_ishtp_msg *out =
(struct cros_ec_ishtp_msg *)response_buffer;
out->hdr.channel = CROS_EC_COMMAND;
out->hdr.status = 0;
heci_send_msg(heci_cros_ec_handle, (uint8_t *)out,
pkt->response_size + CROS_EC_ISHTP_MSG_HDR_SIZE);
}
static void cros_ec_ishtp_subsys_new_msg_received(const heci_handle_t handle,
uint8_t *msg, const size_t msg_size)
{
struct cros_ec_ishtp_msg *in = (void *) msg;
struct cros_ec_ishtp_msg *out = (void *) response_buffer;
if (in->hdr.channel != CROS_EC_COMMAND) {
CPRINTS("Unknown HECI packet 0x%02x", in->hdr.channel);
return;
}
memset(&heci_packet, 0, sizeof(heci_packet));
heci_packet.send_response = heci_send_hostcmd_response;
heci_packet.request = in->data;
heci_packet.request_max = HECI_MAX_MSG_SIZE;
heci_packet.request_size = msg_size - CROS_EC_ISHTP_MSG_HDR_SIZE;
heci_packet.response = out->data;
heci_packet.response_max = HECI_CROS_EC_RESPONSE_MAX;
heci_packet.response_size = 0;
heci_packet.driver_result = EC_RES_SUCCESS;
host_packet_receive(&heci_packet);
}
/*
* IPC transfer max is actual 4K, but we don't need kernel buffers that big
*
* Basing size off of existing cros_ec implementations ranging from 128 to 512
*/
#define HECI_CROS_EC_LIMIT_PACKET_SIZE 256
/**
* Get protocol information
*/
static int heci_get_protocol_info(struct host_cmd_handler_args *args)
{
struct ec_response_get_protocol_info *r = args->response;
memset(r, 0, sizeof(*r));
r->protocol_versions = (1 << 3);
r->max_request_packet_size = HECI_CROS_EC_LIMIT_PACKET_SIZE;
r->max_response_packet_size = HECI_CROS_EC_RESPONSE_MAX;
args->response_size = sizeof(*r);
return EC_SUCCESS;
}
DECLARE_HOST_COMMAND(EC_CMD_GET_PROTOCOL_INFO, heci_get_protocol_info,
EC_VER_MASK(0));
static int cros_ec_ishtp_subsys_initialize(const heci_handle_t heci_handle)
{
heci_cros_ec_handle = heci_handle;
return EC_SUCCESS;
}
static int cros_ec_ishtp_no_op(const heci_handle_t heci_handle)
{
return EC_SUCCESS;
}
static const struct heci_client_callbacks cros_ec_ishtp_subsys_heci_cbs = {
.initialize = cros_ec_ishtp_subsys_initialize,
.new_msg_received = cros_ec_ishtp_subsys_new_msg_received,
.suspend = cros_ec_ishtp_no_op,
.resume = cros_ec_ishtp_no_op,
};
static const struct heci_client cros_ec_ishtp_heci_client = {
.protocol_id = HECI_CLIENT_CROS_EC_ISH_GUID,
.max_msg_size = HECI_MAX_MSG_SIZE,
.protocol_ver = 1,
.max_n_of_connections = 1,
.cbs = &cros_ec_ishtp_subsys_heci_cbs,
};
HECI_CLIENT_ENTRY(cros_ec_ishtp_heci_client);
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