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540 lines
18 KiB
540 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Copyright (c) 2013-2018, The Linux Foundation. All rights reserved. |
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* Copyright (C) 2018-2020 Linaro Ltd. |
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*/ |
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#include <linux/types.h> |
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#include <linux/string.h> |
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#include <linux/slab.h> |
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#include <linux/qrtr.h> |
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#include <linux/soc/qcom/qmi.h> |
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#include "ipa.h" |
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#include "ipa_endpoint.h" |
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#include "ipa_mem.h" |
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#include "ipa_table.h" |
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#include "ipa_modem.h" |
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#include "ipa_qmi_msg.h" |
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/** |
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* DOC: AP/Modem QMI Handshake |
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* |
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* The AP and modem perform a "handshake" at initialization time to ensure |
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* both sides know when everything is ready to begin operating. The AP |
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* driver (this code) uses two QMI handles (endpoints) for this; a client |
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* using a service on the modem, and server to service modem requests (and |
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* to supply an indication message from the AP). Once the handshake is |
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* complete, the AP and modem may begin IPA operation. This occurs |
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* only when the AP IPA driver, modem IPA driver, and IPA microcontroller |
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* are ready. |
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* |
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* The QMI service on the modem expects to receive an INIT_DRIVER request from |
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* the AP, which contains parameters used by the modem during initialization. |
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* The AP sends this request as soon as it is knows the modem side service |
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* is available. The modem responds to this request, and if this response |
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* contains a success result, the AP knows the modem IPA driver is ready. |
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* |
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* The modem is responsible for loading firmware on the IPA microcontroller. |
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* This occurs only during the initial modem boot. The modem sends a |
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* separate DRIVER_INIT_COMPLETE request to the AP to report that the |
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* microcontroller is ready. The AP may assume the microcontroller is |
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* ready and remain so (even if the modem reboots) once it has received |
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* and responded to this request. |
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* |
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* There is one final exchange involved in the handshake. It is required |
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* on the initial modem boot, but optional (but in practice does occur) on |
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* subsequent boots. The modem expects to receive a final INIT_COMPLETE |
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* indication message from the AP when it is about to begin its normal |
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* operation. The AP will only send this message after it has received |
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* and responded to an INDICATION_REGISTER request from the modem. |
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* |
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* So in summary: |
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* - Whenever the AP learns the modem has booted and its IPA QMI service |
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* is available, it sends an INIT_DRIVER request to the modem. The |
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* modem supplies a success response when it is ready to operate. |
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* - On the initial boot, the modem sets up the IPA microcontroller, and |
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* sends a DRIVER_INIT_COMPLETE request to the AP when this is done. |
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* - When the modem is ready to receive an INIT_COMPLETE indication from |
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* the AP, it sends an INDICATION_REGISTER request to the AP. |
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* - On the initial modem boot, everything is ready when: |
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* - AP has received a success response from its INIT_DRIVER request |
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* - AP has responded to a DRIVER_INIT_COMPLETE request |
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* - AP has responded to an INDICATION_REGISTER request from the modem |
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* - AP has sent an INIT_COMPLETE indication to the modem |
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* - On subsequent modem boots, everything is ready when: |
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* - AP has received a success response from its INIT_DRIVER request |
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* - AP has responded to a DRIVER_INIT_COMPLETE request |
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* - The INDICATION_REGISTER request and INIT_COMPLETE indication are |
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* optional for non-initial modem boots, and have no bearing on the |
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* determination of when things are "ready" |
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*/ |
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#define IPA_HOST_SERVICE_SVC_ID 0x31 |
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#define IPA_HOST_SVC_VERS 1 |
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#define IPA_HOST_SERVICE_INS_ID 1 |
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#define IPA_MODEM_SERVICE_SVC_ID 0x31 |
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#define IPA_MODEM_SERVICE_INS_ID 2 |
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#define IPA_MODEM_SVC_VERS 1 |
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#define QMI_INIT_DRIVER_TIMEOUT 60000 /* A minute in milliseconds */ |
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/* Send an INIT_COMPLETE indication message to the modem */ |
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static void ipa_server_init_complete(struct ipa_qmi *ipa_qmi) |
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{ |
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struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi); |
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struct qmi_handle *qmi = &ipa_qmi->server_handle; |
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struct sockaddr_qrtr *sq = &ipa_qmi->modem_sq; |
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struct ipa_init_complete_ind ind = { }; |
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int ret; |
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ind.status.result = QMI_RESULT_SUCCESS_V01; |
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ind.status.error = QMI_ERR_NONE_V01; |
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ret = qmi_send_indication(qmi, sq, IPA_QMI_INIT_COMPLETE, |
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IPA_QMI_INIT_COMPLETE_IND_SZ, |
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ipa_init_complete_ind_ei, &ind); |
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if (ret) |
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dev_err(&ipa->pdev->dev, |
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"error %d sending init complete indication\n", ret); |
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else |
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ipa_qmi->indication_sent = true; |
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} |
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/* If requested (and not already sent) send the INIT_COMPLETE indication */ |
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static void ipa_qmi_indication(struct ipa_qmi *ipa_qmi) |
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{ |
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if (!ipa_qmi->indication_requested) |
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return; |
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if (ipa_qmi->indication_sent) |
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return; |
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ipa_server_init_complete(ipa_qmi); |
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} |
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/* Determine whether everything is ready to start normal operation. |
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* We know everything (else) is ready when we know the IPA driver on |
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* the modem is ready, and the microcontroller is ready. |
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* |
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* When the modem boots (or reboots), the handshake sequence starts |
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* with the AP sending the modem an INIT_DRIVER request. Within |
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* that request, the uc_loaded flag will be zero (false) for an |
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* initial boot, non-zero (true) for a subsequent (SSR) boot. |
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*/ |
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static void ipa_qmi_ready(struct ipa_qmi *ipa_qmi) |
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{ |
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struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi); |
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int ret; |
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/* We aren't ready until the modem and microcontroller are */ |
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if (!ipa_qmi->modem_ready || !ipa_qmi->uc_ready) |
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return; |
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/* Send the indication message if it was requested */ |
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ipa_qmi_indication(ipa_qmi); |
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/* The initial boot requires us to send the indication. */ |
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if (ipa_qmi->initial_boot) { |
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if (!ipa_qmi->indication_sent) |
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return; |
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/* The initial modem boot completed successfully */ |
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ipa_qmi->initial_boot = false; |
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} |
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/* We're ready. Start up normal operation */ |
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ipa = container_of(ipa_qmi, struct ipa, qmi); |
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ret = ipa_modem_start(ipa); |
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if (ret) |
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dev_err(&ipa->pdev->dev, "error %d starting modem\n", ret); |
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} |
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/* All QMI clients from the modem node are gone (modem shut down or crashed). */ |
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static void ipa_server_bye(struct qmi_handle *qmi, unsigned int node) |
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{ |
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struct ipa_qmi *ipa_qmi; |
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ipa_qmi = container_of(qmi, struct ipa_qmi, server_handle); |
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/* The modem client and server go away at the same time */ |
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memset(&ipa_qmi->modem_sq, 0, sizeof(ipa_qmi->modem_sq)); |
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/* initial_boot doesn't change when modem reboots */ |
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/* uc_ready doesn't change when modem reboots */ |
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ipa_qmi->modem_ready = false; |
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ipa_qmi->indication_requested = false; |
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ipa_qmi->indication_sent = false; |
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} |
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static const struct qmi_ops ipa_server_ops = { |
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.bye = ipa_server_bye, |
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}; |
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/* Callback function to handle an INDICATION_REGISTER request message from the |
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* modem. This informs the AP that the modem is now ready to receive the |
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* INIT_COMPLETE indication message. |
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*/ |
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static void ipa_server_indication_register(struct qmi_handle *qmi, |
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struct sockaddr_qrtr *sq, |
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struct qmi_txn *txn, |
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const void *decoded) |
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{ |
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struct ipa_indication_register_rsp rsp = { }; |
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struct ipa_qmi *ipa_qmi; |
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struct ipa *ipa; |
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int ret; |
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ipa_qmi = container_of(qmi, struct ipa_qmi, server_handle); |
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ipa = container_of(ipa_qmi, struct ipa, qmi); |
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rsp.rsp.result = QMI_RESULT_SUCCESS_V01; |
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rsp.rsp.error = QMI_ERR_NONE_V01; |
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ret = qmi_send_response(qmi, sq, txn, IPA_QMI_INDICATION_REGISTER, |
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IPA_QMI_INDICATION_REGISTER_RSP_SZ, |
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ipa_indication_register_rsp_ei, &rsp); |
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if (!ret) { |
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ipa_qmi->indication_requested = true; |
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ipa_qmi_ready(ipa_qmi); /* We might be ready now */ |
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} else { |
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dev_err(&ipa->pdev->dev, |
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"error %d sending register indication response\n", ret); |
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} |
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} |
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/* Respond to a DRIVER_INIT_COMPLETE request message from the modem. */ |
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static void ipa_server_driver_init_complete(struct qmi_handle *qmi, |
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struct sockaddr_qrtr *sq, |
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struct qmi_txn *txn, |
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const void *decoded) |
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{ |
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struct ipa_driver_init_complete_rsp rsp = { }; |
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struct ipa_qmi *ipa_qmi; |
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struct ipa *ipa; |
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int ret; |
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ipa_qmi = container_of(qmi, struct ipa_qmi, server_handle); |
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ipa = container_of(ipa_qmi, struct ipa, qmi); |
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rsp.rsp.result = QMI_RESULT_SUCCESS_V01; |
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rsp.rsp.error = QMI_ERR_NONE_V01; |
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ret = qmi_send_response(qmi, sq, txn, IPA_QMI_DRIVER_INIT_COMPLETE, |
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IPA_QMI_DRIVER_INIT_COMPLETE_RSP_SZ, |
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ipa_driver_init_complete_rsp_ei, &rsp); |
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if (!ret) { |
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ipa_qmi->uc_ready = true; |
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ipa_qmi_ready(ipa_qmi); /* We might be ready now */ |
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} else { |
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dev_err(&ipa->pdev->dev, |
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"error %d sending init complete response\n", ret); |
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} |
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} |
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/* The server handles two request message types sent by the modem. */ |
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static const struct qmi_msg_handler ipa_server_msg_handlers[] = { |
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{ |
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.type = QMI_REQUEST, |
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.msg_id = IPA_QMI_INDICATION_REGISTER, |
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.ei = ipa_indication_register_req_ei, |
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.decoded_size = IPA_QMI_INDICATION_REGISTER_REQ_SZ, |
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.fn = ipa_server_indication_register, |
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}, |
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{ |
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.type = QMI_REQUEST, |
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.msg_id = IPA_QMI_DRIVER_INIT_COMPLETE, |
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.ei = ipa_driver_init_complete_req_ei, |
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.decoded_size = IPA_QMI_DRIVER_INIT_COMPLETE_REQ_SZ, |
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.fn = ipa_server_driver_init_complete, |
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}, |
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{ }, |
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}; |
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/* Handle an INIT_DRIVER response message from the modem. */ |
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static void ipa_client_init_driver(struct qmi_handle *qmi, |
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struct sockaddr_qrtr *sq, |
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struct qmi_txn *txn, const void *decoded) |
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{ |
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txn->result = 0; /* IPA_QMI_INIT_DRIVER request was successful */ |
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complete(&txn->completion); |
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} |
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/* The client handles one response message type sent by the modem. */ |
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static const struct qmi_msg_handler ipa_client_msg_handlers[] = { |
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{ |
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.type = QMI_RESPONSE, |
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.msg_id = IPA_QMI_INIT_DRIVER, |
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.ei = ipa_init_modem_driver_rsp_ei, |
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.decoded_size = IPA_QMI_INIT_DRIVER_RSP_SZ, |
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.fn = ipa_client_init_driver, |
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}, |
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{ }, |
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}; |
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/* Return a pointer to an init modem driver request structure, which contains |
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* configuration parameters for the modem. The modem may be started multiple |
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* times, but generally these parameters don't change so we can reuse the |
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* request structure once it's initialized. The only exception is the |
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* skip_uc_load field, which will be set only after the microcontroller has |
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* reported it has completed its initialization. |
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*/ |
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static const struct ipa_init_modem_driver_req * |
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init_modem_driver_req(struct ipa_qmi *ipa_qmi) |
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{ |
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struct ipa *ipa = container_of(ipa_qmi, struct ipa, qmi); |
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static struct ipa_init_modem_driver_req req; |
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const struct ipa_mem *mem; |
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/* The microcontroller is initialized on the first boot */ |
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req.skip_uc_load_valid = 1; |
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req.skip_uc_load = ipa->uc_loaded ? 1 : 0; |
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/* We only have to initialize most of it once */ |
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if (req.platform_type_valid) |
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return &req; |
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req.platform_type_valid = 1; |
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req.platform_type = IPA_QMI_PLATFORM_TYPE_MSM_ANDROID; |
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mem = &ipa->mem[IPA_MEM_MODEM_HEADER]; |
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if (mem->size) { |
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req.hdr_tbl_info_valid = 1; |
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req.hdr_tbl_info.start = ipa->mem_offset + mem->offset; |
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req.hdr_tbl_info.end = req.hdr_tbl_info.start + mem->size - 1; |
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} |
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mem = &ipa->mem[IPA_MEM_V4_ROUTE]; |
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req.v4_route_tbl_info_valid = 1; |
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req.v4_route_tbl_info.start = ipa->mem_offset + mem->offset; |
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req.v4_route_tbl_info.count = mem->size / IPA_TABLE_ENTRY_SIZE; |
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mem = &ipa->mem[IPA_MEM_V6_ROUTE]; |
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req.v6_route_tbl_info_valid = 1; |
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req.v6_route_tbl_info.start = ipa->mem_offset + mem->offset; |
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req.v6_route_tbl_info.count = mem->size / IPA_TABLE_ENTRY_SIZE; |
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mem = &ipa->mem[IPA_MEM_V4_FILTER]; |
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req.v4_filter_tbl_start_valid = 1; |
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req.v4_filter_tbl_start = ipa->mem_offset + mem->offset; |
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mem = &ipa->mem[IPA_MEM_V6_FILTER]; |
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req.v6_filter_tbl_start_valid = 1; |
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req.v6_filter_tbl_start = ipa->mem_offset + mem->offset; |
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mem = &ipa->mem[IPA_MEM_MODEM]; |
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if (mem->size) { |
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req.modem_mem_info_valid = 1; |
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req.modem_mem_info.start = ipa->mem_offset + mem->offset; |
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req.modem_mem_info.size = mem->size; |
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} |
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req.ctrl_comm_dest_end_pt_valid = 1; |
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req.ctrl_comm_dest_end_pt = |
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ipa->name_map[IPA_ENDPOINT_AP_MODEM_RX]->endpoint_id; |
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/* skip_uc_load_valid and skip_uc_load are set above */ |
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mem = &ipa->mem[IPA_MEM_MODEM_PROC_CTX]; |
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if (mem->size) { |
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req.hdr_proc_ctx_tbl_info_valid = 1; |
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req.hdr_proc_ctx_tbl_info.start = |
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ipa->mem_offset + mem->offset; |
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req.hdr_proc_ctx_tbl_info.end = |
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req.hdr_proc_ctx_tbl_info.start + mem->size - 1; |
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} |
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/* Nothing to report for the compression table (zip_tbl_info) */ |
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mem = &ipa->mem[IPA_MEM_V4_ROUTE_HASHED]; |
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if (mem->size) { |
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req.v4_hash_route_tbl_info_valid = 1; |
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req.v4_hash_route_tbl_info.start = |
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ipa->mem_offset + mem->offset; |
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req.v4_hash_route_tbl_info.count = |
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mem->size / IPA_TABLE_ENTRY_SIZE; |
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} |
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mem = &ipa->mem[IPA_MEM_V6_ROUTE_HASHED]; |
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if (mem->size) { |
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req.v6_hash_route_tbl_info_valid = 1; |
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req.v6_hash_route_tbl_info.start = |
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ipa->mem_offset + mem->offset; |
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req.v6_hash_route_tbl_info.count = |
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mem->size / IPA_TABLE_ENTRY_SIZE; |
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} |
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mem = &ipa->mem[IPA_MEM_V4_FILTER_HASHED]; |
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if (mem->size) { |
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req.v4_hash_filter_tbl_start_valid = 1; |
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req.v4_hash_filter_tbl_start = ipa->mem_offset + mem->offset; |
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} |
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mem = &ipa->mem[IPA_MEM_V6_FILTER_HASHED]; |
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if (mem->size) { |
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req.v6_hash_filter_tbl_start_valid = 1; |
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req.v6_hash_filter_tbl_start = ipa->mem_offset + mem->offset; |
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} |
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/* None of the stats fields are valid (IPA v4.0 and above) */ |
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if (ipa->version != IPA_VERSION_3_5_1) { |
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mem = &ipa->mem[IPA_MEM_STATS_QUOTA]; |
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if (mem->size) { |
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req.hw_stats_quota_base_addr_valid = 1; |
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req.hw_stats_quota_base_addr = |
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ipa->mem_offset + mem->offset; |
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req.hw_stats_quota_size_valid = 1; |
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req.hw_stats_quota_size = ipa->mem_offset + mem->size; |
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} |
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mem = &ipa->mem[IPA_MEM_STATS_DROP]; |
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if (mem->size) { |
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req.hw_stats_drop_base_addr_valid = 1; |
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req.hw_stats_drop_base_addr = |
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ipa->mem_offset + mem->offset; |
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req.hw_stats_drop_size_valid = 1; |
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req.hw_stats_drop_size = ipa->mem_offset + mem->size; |
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} |
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} |
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return &req; |
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} |
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/* Send an INIT_DRIVER request to the modem, and wait for it to complete. */ |
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static void ipa_client_init_driver_work(struct work_struct *work) |
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{ |
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unsigned long timeout = msecs_to_jiffies(QMI_INIT_DRIVER_TIMEOUT); |
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const struct ipa_init_modem_driver_req *req; |
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struct ipa_qmi *ipa_qmi; |
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struct qmi_handle *qmi; |
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struct qmi_txn txn; |
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struct device *dev; |
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struct ipa *ipa; |
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int ret; |
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ipa_qmi = container_of(work, struct ipa_qmi, init_driver_work); |
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qmi = &ipa_qmi->client_handle; |
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ipa = container_of(ipa_qmi, struct ipa, qmi); |
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dev = &ipa->pdev->dev; |
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ret = qmi_txn_init(qmi, &txn, NULL, NULL); |
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if (ret < 0) { |
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dev_err(dev, "error %d preparing init driver request\n", ret); |
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return; |
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} |
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/* Send the request, and if successful wait for its response */ |
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req = init_modem_driver_req(ipa_qmi); |
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ret = qmi_send_request(qmi, &ipa_qmi->modem_sq, &txn, |
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IPA_QMI_INIT_DRIVER, IPA_QMI_INIT_DRIVER_REQ_SZ, |
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ipa_init_modem_driver_req_ei, req); |
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if (ret) |
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dev_err(dev, "error %d sending init driver request\n", ret); |
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else if ((ret = qmi_txn_wait(&txn, timeout))) |
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dev_err(dev, "error %d awaiting init driver response\n", ret); |
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if (!ret) { |
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ipa_qmi->modem_ready = true; |
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ipa_qmi_ready(ipa_qmi); /* We might be ready now */ |
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} else { |
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/* If any error occurs we need to cancel the transaction */ |
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qmi_txn_cancel(&txn); |
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} |
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} |
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/* The modem server is now available. We will send an INIT_DRIVER request |
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* to the modem, but can't wait for it to complete in this callback thread. |
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* Schedule a worker on the global workqueue to do that for us. |
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*/ |
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static int |
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ipa_client_new_server(struct qmi_handle *qmi, struct qmi_service *svc) |
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{ |
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struct ipa_qmi *ipa_qmi; |
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ipa_qmi = container_of(qmi, struct ipa_qmi, client_handle); |
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ipa_qmi->modem_sq.sq_family = AF_QIPCRTR; |
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ipa_qmi->modem_sq.sq_node = svc->node; |
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ipa_qmi->modem_sq.sq_port = svc->port; |
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schedule_work(&ipa_qmi->init_driver_work); |
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return 0; |
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} |
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static const struct qmi_ops ipa_client_ops = { |
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.new_server = ipa_client_new_server, |
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}; |
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/* This is called by ipa_setup(). We can be informed via remoteproc that |
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* the modem has shut down, in which case this function will be called |
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* again to prepare for it coming back up again. |
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*/ |
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int ipa_qmi_setup(struct ipa *ipa) |
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{ |
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struct ipa_qmi *ipa_qmi = &ipa->qmi; |
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int ret; |
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ipa_qmi->initial_boot = true; |
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/* The server handle is used to handle the DRIVER_INIT_COMPLETE |
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* 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; |
|
} |
|
|
|
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)); |
|
}
|
|
|