| // SPDX-License-Identifier: GPL-2.0 |
| |
| /* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved. |
| * Copyright (C) 2018-2020 Linaro Ltd. |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/string.h> |
| #include <linux/slab.h> |
| #include <linux/qrtr.h> |
| #include <linux/soc/qcom/qmi.h> |
| |
| #include "ipa.h" |
| #include "ipa_endpoint.h" |
| #include "ipa_mem.h" |
| #include "ipa_table.h" |
| #include "ipa_modem.h" |
| #include "ipa_qmi_msg.h" |
| |
| /** |
| * DOC: AP/Modem QMI Handshake |
| * |
| * The AP and modem perform a "handshake" at initialization time to ensure |
| * both sides know when everything is ready to begin operating. The AP |
| * driver (this code) uses two QMI handles (endpoints) for this; a client |
| * using a service on the modem, and server to service modem requests (and |
| * to supply an indication message from the AP). Once the handshake is |
| * complete, the AP and modem may begin IPA operation. This occurs |
| * only when the AP IPA driver, modem IPA driver, and IPA microcontroller |
| * are ready. |
| * |
| * The QMI service on the modem expects to receive an INIT_DRIVER request from |
| * the AP, which contains parameters used by the modem during initialization. |
| * The AP sends this request as soon as it is knows the modem side service |
| * is available. The modem responds to this request, and if this response |
| * contains a success result, the AP knows the modem IPA driver is ready. |
| * |
| * The modem is responsible for loading firmware on the IPA microcontroller. |
| * This occurs only during the initial modem boot. The modem sends a |
| * separate DRIVER_INIT_COMPLETE request to the AP to report that the |
| * microcontroller is ready. The AP may assume the microcontroller is |
| * ready and remain so (even if the modem reboots) once it has received |
| * and responded to this request. |
| * |
| * There is one final exchange involved in the handshake. It is required |
| * on the initial modem boot, but optional (but in practice does occur) on |
| * subsequent boots. The modem expects to receive a final INIT_COMPLETE |
| * indication message from the AP when it is about to begin its normal |
| * operation. The AP will only send this message after it has received |
| * and responded to an INDICATION_REGISTER request from the modem. |
| * |
| * So in summary: |
| * - Whenever the AP learns the modem has booted and its IPA QMI service |
| * is available, it sends an INIT_DRIVER request to the modem. The |
| * modem supplies a success response when it is ready to operate. |
| * - On the initial boot, the modem sets up the IPA microcontroller, and |
| * sends a DRIVER_INIT_COMPLETE request to the AP when this is done. |
| * - When the modem is ready to receive an INIT_COMPLETE indication from |
| * the AP, it sends an INDICATION_REGISTER request to the AP. |
| * - On the initial modem boot, everything is ready when: |
| * - AP has received a success response from its INIT_DRIVER request |
| * - AP has responded to a DRIVER_INIT_COMPLETE request |
| * - AP has responded to an INDICATION_REGISTER request from the modem |
| * - AP has sent an INIT_COMPLETE indication to the modem |
| * - On subsequent modem boots, everything is ready when: |
| * - AP has received a success response from its INIT_DRIVER request |
| * - AP has responded to a DRIVER_INIT_COMPLETE request |
| * - The INDICATION_REGISTER request and INIT_COMPLETE indication are |
| * optional for non-initial modem boots, and have no bearing on the |
| * determination of when things are "ready" |
| */ |
| |
| #define IPA_HOST_SERVICE_SVC_ID 0x31 |
| #define IPA_HOST_SVC_VERS 1 |
| #define IPA_HOST_SERVICE_INS_ID 1 |
| |
| #define IPA_MODEM_SERVICE_SVC_ID 0x31 |
| #define IPA_MODEM_SERVICE_INS_ID 2 |
| #define IPA_MODEM_SVC_VERS 1 |
| |
| #define QMI_INIT_DRIVER_TIMEOUT 60000 /* A minute in milliseconds */ |
| |
| /* Send an INIT_COMPLETE indication message to the modem */ |
| static void ipa_server_init_complete(struct ipa_qmi *ipa_qmi) |
| { |
| struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi); |
| struct qmi_handle *qmi = &ipa_qmi->server_handle; |
| struct sockaddr_qrtr *sq = &ipa_qmi->modem_sq; |
| struct ipa_init_complete_ind ind = { }; |
| int ret; |
| |
| ind.status.result = QMI_RESULT_SUCCESS_V01; |
| ind.status.error = QMI_ERR_NONE_V01; |
| |
| ret = qmi_send_indication(qmi, sq, IPA_QMI_INIT_COMPLETE, |
| IPA_QMI_INIT_COMPLETE_IND_SZ, |
| ipa_init_complete_ind_ei, &ind); |
| if (ret) |
| dev_err(&ipa->pdev->dev, |
| "error %d sending init complete indication\n", ret); |
| else |
| ipa_qmi->indication_sent = true; |
| } |
| |
| /* If requested (and not already sent) send the INIT_COMPLETE indication */ |
| static void ipa_qmi_indication(struct ipa_qmi *ipa_qmi) |
| { |
| if (!ipa_qmi->indication_requested) |
| return; |
| |
| if (ipa_qmi->indication_sent) |
| return; |
| |
| ipa_server_init_complete(ipa_qmi); |
| } |
| |
| /* Determine whether everything is ready to start normal operation. |
| * We know everything (else) is ready when we know the IPA driver on |
| * the modem is ready, and the microcontroller is ready. |
| * |
| * When the modem boots (or reboots), the handshake sequence starts |
| * with the AP sending the modem an INIT_DRIVER request. Within |
| * that request, the uc_loaded flag will be zero (false) for an |
| * initial boot, non-zero (true) for a subsequent (SSR) boot. |
| */ |
| static void ipa_qmi_ready(struct ipa_qmi *ipa_qmi) |
| { |
| struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi); |
| int ret; |
| |
| /* We aren't ready until the modem and microcontroller are */ |
| if (!ipa_qmi->modem_ready || !ipa_qmi->uc_ready) |
| return; |
| |
| /* Send the indication message if it was requested */ |
| ipa_qmi_indication(ipa_qmi); |
| |
| /* The initial boot requires us to send the indication. */ |
| if (ipa_qmi->initial_boot) { |
| if (!ipa_qmi->indication_sent) |
| return; |
| |
| /* The initial modem boot completed successfully */ |
| ipa_qmi->initial_boot = false; |
| } |
| |
| /* We're ready. Start up normal operation */ |
| ipa = container_of(ipa_qmi, struct ipa, qmi); |
| ret = ipa_modem_start(ipa); |
| if (ret) |
| dev_err(&ipa->pdev->dev, "error %d starting modem\n", ret); |
| } |
| |
| /* All QMI clients from the modem node are gone (modem shut down or crashed). */ |
| static void ipa_server_bye(struct qmi_handle *qmi, unsigned int node) |
| { |
| struct ipa_qmi *ipa_qmi; |
| |
| ipa_qmi = container_of(qmi, struct ipa_qmi, server_handle); |
| |
| /* The modem client and server go away at the same time */ |
| memset(&ipa_qmi->modem_sq, 0, sizeof(ipa_qmi->modem_sq)); |
| |
| /* initial_boot doesn't change when modem reboots */ |
| /* uc_ready doesn't change when modem reboots */ |
| ipa_qmi->modem_ready = false; |
| ipa_qmi->indication_requested = false; |
| ipa_qmi->indication_sent = false; |
| } |
| |
| static const struct qmi_ops ipa_server_ops = { |
| .bye = ipa_server_bye, |
| }; |
| |
| /* Callback function to handle an INDICATION_REGISTER request message from the |
| * modem. This informs the AP that the modem is now ready to receive the |
| * INIT_COMPLETE indication message. |
| */ |
| static void ipa_server_indication_register(struct qmi_handle *qmi, |
| struct sockaddr_qrtr *sq, |
| struct qmi_txn *txn, |
| const void *decoded) |
| { |
| struct ipa_indication_register_rsp rsp = { }; |
| struct ipa_qmi *ipa_qmi; |
| struct ipa *ipa; |
| int ret; |
| |
| ipa_qmi = container_of(qmi, struct ipa_qmi, server_handle); |
| ipa = container_of(ipa_qmi, struct ipa, qmi); |
| |
| rsp.rsp.result = QMI_RESULT_SUCCESS_V01; |
| rsp.rsp.error = QMI_ERR_NONE_V01; |
| |
| ret = qmi_send_response(qmi, sq, txn, IPA_QMI_INDICATION_REGISTER, |
| IPA_QMI_INDICATION_REGISTER_RSP_SZ, |
| ipa_indication_register_rsp_ei, &rsp); |
| if (!ret) { |
| ipa_qmi->indication_requested = true; |
| ipa_qmi_ready(ipa_qmi); /* We might be ready now */ |
| } else { |
| dev_err(&ipa->pdev->dev, |
| "error %d sending register indication response\n", ret); |
| } |
| } |
| |
| /* Respond to a DRIVER_INIT_COMPLETE request message from the modem. */ |
| static void ipa_server_driver_init_complete(struct qmi_handle *qmi, |
| struct sockaddr_qrtr *sq, |
| struct qmi_txn *txn, |
| const void *decoded) |
| { |
| struct ipa_driver_init_complete_rsp rsp = { }; |
| struct ipa_qmi *ipa_qmi; |
| struct ipa *ipa; |
| int ret; |
| |
| ipa_qmi = container_of(qmi, struct ipa_qmi, server_handle); |
| ipa = container_of(ipa_qmi, struct ipa, qmi); |
| |
| rsp.rsp.result = QMI_RESULT_SUCCESS_V01; |
| rsp.rsp.error = QMI_ERR_NONE_V01; |
| |
| ret = qmi_send_response(qmi, sq, txn, IPA_QMI_DRIVER_INIT_COMPLETE, |
| IPA_QMI_DRIVER_INIT_COMPLETE_RSP_SZ, |
| ipa_driver_init_complete_rsp_ei, &rsp); |
| if (!ret) { |
| ipa_qmi->uc_ready = true; |
| ipa_qmi_ready(ipa_qmi); /* We might be ready now */ |
| } else { |
| dev_err(&ipa->pdev->dev, |
| "error %d sending init complete response\n", ret); |
| } |
| } |
| |
| /* The server handles two request message types sent by the modem. */ |
| static const struct qmi_msg_handler ipa_server_msg_handlers[] = { |
| { |
| .type = QMI_REQUEST, |
| .msg_id = IPA_QMI_INDICATION_REGISTER, |
| .ei = ipa_indication_register_req_ei, |
| .decoded_size = IPA_QMI_INDICATION_REGISTER_REQ_SZ, |
| .fn = ipa_server_indication_register, |
| }, |
| { |
| .type = QMI_REQUEST, |
| .msg_id = IPA_QMI_DRIVER_INIT_COMPLETE, |
| .ei = ipa_driver_init_complete_req_ei, |
| .decoded_size = IPA_QMI_DRIVER_INIT_COMPLETE_REQ_SZ, |
| .fn = ipa_server_driver_init_complete, |
| }, |
| { }, |
| }; |
| |
| /* Handle an INIT_DRIVER response message from the modem. */ |
| static void ipa_client_init_driver(struct qmi_handle *qmi, |
| struct sockaddr_qrtr *sq, |
| struct qmi_txn *txn, const void *decoded) |
| { |
| txn->result = 0; /* IPA_QMI_INIT_DRIVER request was successful */ |
| complete(&txn->completion); |
| } |
| |
| /* The client handles one response message type sent by the modem. */ |
| static const struct qmi_msg_handler ipa_client_msg_handlers[] = { |
| { |
| .type = QMI_RESPONSE, |
| .msg_id = IPA_QMI_INIT_DRIVER, |
| .ei = ipa_init_modem_driver_rsp_ei, |
| .decoded_size = IPA_QMI_INIT_DRIVER_RSP_SZ, |
| .fn = ipa_client_init_driver, |
| }, |
| { }, |
| }; |
| |
| /* Return a pointer to an init modem driver request structure, which contains |
| * configuration parameters for the modem. The modem may be started multiple |
| * times, but generally these parameters don't change so we can reuse the |
| * request structure once it's initialized. The only exception is the |
| * skip_uc_load field, which will be set only after the microcontroller has |
| * reported it has completed its initialization. |
| */ |
| static const struct ipa_init_modem_driver_req * |
| init_modem_driver_req(struct ipa_qmi *ipa_qmi) |
| { |
| struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi); |
| static struct ipa_init_modem_driver_req req; |
| const struct ipa_mem *mem; |
| |
| /* The microcontroller is initialized on the first boot */ |
| req.skip_uc_load_valid = 1; |
| req.skip_uc_load = ipa->uc_loaded ? 1 : 0; |
| |
| /* We only have to initialize most of it once */ |
| if (req.platform_type_valid) |
| return &req; |
| |
| req.platform_type_valid = 1; |
| req.platform_type = IPA_QMI_PLATFORM_TYPE_MSM_ANDROID; |
| |
| mem = ipa_mem_find(ipa, IPA_MEM_MODEM_HEADER); |
| if (mem->size) { |
| req.hdr_tbl_info_valid = 1; |
| req.hdr_tbl_info.start = ipa->mem_offset + mem->offset; |
| req.hdr_tbl_info.end = req.hdr_tbl_info.start + mem->size - 1; |
| } |
| |
| mem = ipa_mem_find(ipa, IPA_MEM_V4_ROUTE); |
| req.v4_route_tbl_info_valid = 1; |
| req.v4_route_tbl_info.start = ipa->mem_offset + mem->offset; |
| req.v4_route_tbl_info.end = IPA_ROUTE_MODEM_COUNT - 1; |
| |
| mem = ipa_mem_find(ipa, IPA_MEM_V6_ROUTE); |
| req.v6_route_tbl_info_valid = 1; |
| req.v6_route_tbl_info.start = ipa->mem_offset + mem->offset; |
| req.v6_route_tbl_info.end = IPA_ROUTE_MODEM_COUNT - 1; |
| |
| mem = ipa_mem_find(ipa, IPA_MEM_V4_FILTER); |
| req.v4_filter_tbl_start_valid = 1; |
| req.v4_filter_tbl_start = ipa->mem_offset + mem->offset; |
| |
| mem = ipa_mem_find(ipa, IPA_MEM_V6_FILTER); |
| req.v6_filter_tbl_start_valid = 1; |
| req.v6_filter_tbl_start = ipa->mem_offset + mem->offset; |
| |
| mem = ipa_mem_find(ipa, IPA_MEM_MODEM); |
| if (mem->size) { |
| req.modem_mem_info_valid = 1; |
| req.modem_mem_info.start = ipa->mem_offset + mem->offset; |
| req.modem_mem_info.size = mem->size; |
| } |
| |
| req.ctrl_comm_dest_end_pt_valid = 1; |
| req.ctrl_comm_dest_end_pt = |
| ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->endpoint_id; |
| |
| /* skip_uc_load_valid and skip_uc_load are set above */ |
| |
| mem = ipa_mem_find(ipa, IPA_MEM_MODEM_PROC_CTX); |
| if (mem->size) { |
| req.hdr_proc_ctx_tbl_info_valid = 1; |
| req.hdr_proc_ctx_tbl_info.start = |
| ipa->mem_offset + mem->offset; |
| req.hdr_proc_ctx_tbl_info.end = |
| req.hdr_proc_ctx_tbl_info.start + mem->size - 1; |
| } |
| |
| /* Nothing to report for the compression table (zip_tbl_info) */ |
| |
| mem = ipa_mem_find(ipa, IPA_MEM_V4_ROUTE_HASHED); |
| if (mem->size) { |
| req.v4_hash_route_tbl_info_valid = 1; |
| req.v4_hash_route_tbl_info.start = |
| ipa->mem_offset + mem->offset; |
| req.v4_hash_route_tbl_info.end = IPA_ROUTE_MODEM_COUNT - 1; |
| } |
| |
| mem = ipa_mem_find(ipa, IPA_MEM_V6_ROUTE_HASHED); |
| if (mem->size) { |
| req.v6_hash_route_tbl_info_valid = 1; |
| req.v6_hash_route_tbl_info.start = |
| ipa->mem_offset + mem->offset; |
| req.v6_hash_route_tbl_info.end = IPA_ROUTE_MODEM_COUNT - 1; |
| } |
| |
| mem = ipa_mem_find(ipa, IPA_MEM_V4_FILTER_HASHED); |
| if (mem->size) { |
| req.v4_hash_filter_tbl_start_valid = 1; |
| req.v4_hash_filter_tbl_start = ipa->mem_offset + mem->offset; |
| } |
| |
| mem = ipa_mem_find(ipa, IPA_MEM_V6_FILTER_HASHED); |
| if (mem->size) { |
| req.v6_hash_filter_tbl_start_valid = 1; |
| req.v6_hash_filter_tbl_start = ipa->mem_offset + mem->offset; |
| } |
| |
| /* The stats fields are only valid for IPA v4.0+ */ |
| if (ipa->version >= IPA_VERSION_4_0) { |
| mem = ipa_mem_find(ipa, IPA_MEM_STATS_QUOTA_MODEM); |
| if (mem->size) { |
| req.hw_stats_quota_base_addr_valid = 1; |
| req.hw_stats_quota_base_addr = |
| ipa->mem_offset + mem->offset; |
| req.hw_stats_quota_size_valid = 1; |
| req.hw_stats_quota_size = ipa->mem_offset + mem->size; |
| } |
| |
| /* If the DROP stats region is defined, include it */ |
| mem = ipa_mem_find(ipa, IPA_MEM_STATS_DROP); |
| if (mem && mem->size) { |
| req.hw_stats_drop_base_addr_valid = 1; |
| req.hw_stats_drop_base_addr = |
| ipa->mem_offset + mem->offset; |
| req.hw_stats_drop_size_valid = 1; |
| req.hw_stats_drop_size = ipa->mem_offset + mem->size; |
| } |
| } |
| |
| return &req; |
| } |
| |
| /* Send an INIT_DRIVER request to the modem, and wait for it to complete. */ |
| static void ipa_client_init_driver_work(struct work_struct *work) |
| { |
| unsigned long timeout = msecs_to_jiffies(QMI_INIT_DRIVER_TIMEOUT); |
| const struct ipa_init_modem_driver_req *req; |
| struct ipa_qmi *ipa_qmi; |
| struct qmi_handle *qmi; |
| struct qmi_txn txn; |
| struct device *dev; |
| struct ipa *ipa; |
| int ret; |
| |
| ipa_qmi = container_of(work, struct ipa_qmi, init_driver_work); |
| qmi = &ipa_qmi->client_handle; |
| |
| ipa = container_of(ipa_qmi, struct ipa, qmi); |
| dev = &ipa->pdev->dev; |
| |
| ret = qmi_txn_init(qmi, &txn, NULL, NULL); |
| if (ret < 0) { |
| dev_err(dev, "error %d preparing init driver request\n", ret); |
| return; |
| } |
| |
| /* Send the request, and if successful wait for its response */ |
| req = init_modem_driver_req(ipa_qmi); |
| ret = qmi_send_request(qmi, &ipa_qmi->modem_sq, &txn, |
| IPA_QMI_INIT_DRIVER, IPA_QMI_INIT_DRIVER_REQ_SZ, |
| ipa_init_modem_driver_req_ei, req); |
| if (ret) |
| dev_err(dev, "error %d sending init driver request\n", ret); |
| else if ((ret = qmi_txn_wait(&txn, timeout))) |
| dev_err(dev, "error %d awaiting init driver response\n", ret); |
| |
| if (!ret) { |
| ipa_qmi->modem_ready = true; |
| ipa_qmi_ready(ipa_qmi); /* We might be ready now */ |
| } else { |
| /* If any error occurs we need to cancel the transaction */ |
| qmi_txn_cancel(&txn); |
| } |
| } |
| |
| /* The modem server is now available. We will send an INIT_DRIVER request |
| * to the modem, but can't wait for it to complete in this callback thread. |
| * Schedule a worker on the global workqueue to do that for us. |
| */ |
| static int |
| ipa_client_new_server(struct qmi_handle *qmi, struct qmi_service *svc) |
| { |
| struct ipa_qmi *ipa_qmi; |
| |
| ipa_qmi = container_of(qmi, struct ipa_qmi, client_handle); |
| |
| ipa_qmi->modem_sq.sq_family = AF_QIPCRTR; |
| ipa_qmi->modem_sq.sq_node = svc->node; |
| ipa_qmi->modem_sq.sq_port = svc->port; |
| |
| schedule_work(&ipa_qmi->init_driver_work); |
| |
| return 0; |
| } |
| |
| static const struct qmi_ops ipa_client_ops = { |
| .new_server = ipa_client_new_server, |
| }; |
| |
| /* Set up for QMI message exchange */ |
| int ipa_qmi_setup(struct ipa *ipa) |
| { |
| struct ipa_qmi *ipa_qmi = &ipa->qmi; |
| int ret; |
| |
| ipa_qmi->initial_boot = true; |
| |
| /* The server handle is used to handle the DRIVER_INIT_COMPLETE |
| * request on the first modem boot. It also receives the |
| * INDICATION_REGISTER request on the first boot and (optionally) |
| * subsequent boots. The INIT_COMPLETE indication message is |
| * sent over the server handle if requested. |
| */ |
| ret = qmi_handle_init(&ipa_qmi->server_handle, |
| IPA_QMI_SERVER_MAX_RCV_SZ, &ipa_server_ops, |
| ipa_server_msg_handlers); |
| if (ret) |
| return ret; |
| |
| ret = qmi_add_server(&ipa_qmi->server_handle, IPA_HOST_SERVICE_SVC_ID, |
| IPA_HOST_SVC_VERS, IPA_HOST_SERVICE_INS_ID); |
| if (ret) |
| goto err_server_handle_release; |
| |
| /* The client handle is only used for sending an INIT_DRIVER request |
| * to the modem, and receiving its response message. |
| */ |
| ret = qmi_handle_init(&ipa_qmi->client_handle, |
| IPA_QMI_CLIENT_MAX_RCV_SZ, &ipa_client_ops, |
| ipa_client_msg_handlers); |
| if (ret) |
| goto err_server_handle_release; |
| |
| /* We need this ready before the service lookup is added */ |
| INIT_WORK(&ipa_qmi->init_driver_work, ipa_client_init_driver_work); |
| |
| ret = qmi_add_lookup(&ipa_qmi->client_handle, IPA_MODEM_SERVICE_SVC_ID, |
| IPA_MODEM_SVC_VERS, IPA_MODEM_SERVICE_INS_ID); |
| if (ret) |
| goto err_client_handle_release; |
| |
| return 0; |
| |
| err_client_handle_release: |
| /* Releasing the handle also removes registered lookups */ |
| qmi_handle_release(&ipa_qmi->client_handle); |
| memset(&ipa_qmi->client_handle, 0, sizeof(ipa_qmi->client_handle)); |
| err_server_handle_release: |
| /* Releasing the handle also removes registered services */ |
| qmi_handle_release(&ipa_qmi->server_handle); |
| memset(&ipa_qmi->server_handle, 0, sizeof(ipa_qmi->server_handle)); |
| |
| return ret; |
| } |
| |
| /* Tear down IPA QMI handles */ |
| void ipa_qmi_teardown(struct ipa *ipa) |
| { |
| cancel_work_sync(&ipa->qmi.init_driver_work); |
| |
| qmi_handle_release(&ipa->qmi.client_handle); |
| memset(&ipa->qmi.client_handle, 0, sizeof(ipa->qmi.client_handle)); |
| |
| qmi_handle_release(&ipa->qmi.server_handle); |
| memset(&ipa->qmi.server_handle, 0, sizeof(ipa->qmi.server_handle)); |
| } |