d7f5f3c89c
Set up a subdev in the q6v5 modem remoteproc driver that generates event notifications for the IPA driver to use for initialization and recovery following a modem shutdown or crash. A pair of new functions provides a way for the IPA driver to register and deregister a notification callback function that will be called whenever modem events (about to boot, running, about to shut down, etc.) occur. A void pointer value (provided by the IPA driver at registration time) and an event type are supplied to the callback function. One event, MODEM_REMOVING, is signaled whenever the q6v5 driver is about to remove the notification subdevice. It requires the IPA driver de-register its callback. This sub-device is only used by the modem subsystem (MSS) driver, so the code that adds the new subdev and allows registration and deregistration of the notifier is found in "qcom_q6v6_mss.c". Signed-off-by: Alex Elder <elder@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Qualcomm IPA notification subdev support
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*
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* Copyright (C) 2019 Linaro Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/remoteproc.h>
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#include <linux/remoteproc/qcom_q6v5_ipa_notify.h>
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static void
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ipa_notify_common(struct rproc_subdev *subdev, enum qcom_rproc_event event)
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{
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struct qcom_rproc_ipa_notify *ipa_notify;
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qcom_ipa_notify_t notify;
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ipa_notify = container_of(subdev, struct qcom_rproc_ipa_notify, subdev);
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notify = ipa_notify->notify;
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if (notify)
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notify(ipa_notify->data, event);
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}
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static int ipa_notify_prepare(struct rproc_subdev *subdev)
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{
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ipa_notify_common(subdev, MODEM_STARTING);
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return 0;
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}
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static int ipa_notify_start(struct rproc_subdev *subdev)
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{
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ipa_notify_common(subdev, MODEM_RUNNING);
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return 0;
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}
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static void ipa_notify_stop(struct rproc_subdev *subdev, bool crashed)
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{
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ipa_notify_common(subdev, crashed ? MODEM_CRASHED : MODEM_STOPPING);
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}
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static void ipa_notify_unprepare(struct rproc_subdev *subdev)
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{
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ipa_notify_common(subdev, MODEM_OFFLINE);
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}
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static void ipa_notify_removing(struct rproc_subdev *subdev)
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{
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ipa_notify_common(subdev, MODEM_REMOVING);
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}
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/* Register the IPA notification subdevice with the Q6V5 MSS remoteproc */
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void qcom_add_ipa_notify_subdev(struct rproc *rproc,
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struct qcom_rproc_ipa_notify *ipa_notify)
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{
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ipa_notify->notify = NULL;
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ipa_notify->data = NULL;
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ipa_notify->subdev.prepare = ipa_notify_prepare;
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ipa_notify->subdev.start = ipa_notify_start;
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ipa_notify->subdev.stop = ipa_notify_stop;
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ipa_notify->subdev.unprepare = ipa_notify_unprepare;
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rproc_add_subdev(rproc, &ipa_notify->subdev);
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}
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EXPORT_SYMBOL_GPL(qcom_add_ipa_notify_subdev);
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/* Remove the IPA notification subdevice */
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void qcom_remove_ipa_notify_subdev(struct rproc *rproc,
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struct qcom_rproc_ipa_notify *ipa_notify)
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{
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struct rproc_subdev *subdev = &ipa_notify->subdev;
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ipa_notify_removing(subdev);
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rproc_remove_subdev(rproc, subdev);
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ipa_notify->notify = NULL; /* Make it obvious */
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}
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EXPORT_SYMBOL_GPL(qcom_remove_ipa_notify_subdev);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Qualcomm IPA notification remoteproc subdev");
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