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remoteproc: add IPA notification to q6v5 driver

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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>
This commit is contained in:
Alex Elder
2020-03-05 22:28:15 -06:00
committed by David S. Miller
parent e2f5cb7280
commit d7f5f3c89c
5 changed files with 212 additions and 0 deletions
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82
include/linux/remoteproc/qcom_q6v5_ipa_notify.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (C) 2019 Linaro Ltd. */
#ifndef __QCOM_Q6V5_IPA_NOTIFY_H__
#define __QCOM_Q6V5_IPA_NOTIFY_H__
#if IS_ENABLED(CONFIG_QCOM_Q6V5_IPA_NOTIFY)
#include <linux/remoteproc.h>
enum qcom_rproc_event {
MODEM_STARTING = 0, /* Modem is about to be started */
MODEM_RUNNING = 1, /* Startup complete; modem is operational */
MODEM_STOPPING = 2, /* Modem is about to shut down */
MODEM_CRASHED = 3, /* Modem has crashed (implies stopping) */
MODEM_OFFLINE = 4, /* Modem is now offline */
MODEM_REMOVING = 5, /* Modem is about to be removed */
};
typedef void (*qcom_ipa_notify_t)(void *data, enum qcom_rproc_event event);
struct qcom_rproc_ipa_notify {
struct rproc_subdev subdev;
qcom_ipa_notify_t notify;
void *data;
};
/**
* qcom_add_ipa_notify_subdev() - Register IPA notification subdevice
* @rproc: rproc handle
* @ipa_notify: IPA notification subdevice handle
*
* Register the @ipa_notify subdevice with the @rproc so modem events
* can be sent to IPA when they occur.
*
* This is defined in "qcom_q6v5_ipa_notify.c".
*/
void qcom_add_ipa_notify_subdev(struct rproc *rproc,
struct qcom_rproc_ipa_notify *ipa_notify);
/**
* qcom_remove_ipa_notify_subdev() - Remove IPA SSR subdevice
* @rproc: rproc handle
* @ipa_notify: IPA notification subdevice handle
*
* This is defined in "qcom_q6v5_ipa_notify.c".
*/
void qcom_remove_ipa_notify_subdev(struct rproc *rproc,
struct qcom_rproc_ipa_notify *ipa_notify);
/**
* qcom_register_ipa_notify() - Register IPA notification function
* @rproc: Remote processor handle
* @notify: Non-null IPA notification callback function pointer
* @data: Data supplied to IPA notification callback function
*
* @Return: 0 if successful, or a negative error code otherwise
*
* This is defined in "qcom_q6v5_mss.c".
*/
int qcom_register_ipa_notify(struct rproc *rproc, qcom_ipa_notify_t notify,
void *data);
/**
* qcom_deregister_ipa_notify() - Deregister IPA notification function
* @rproc: Remote processor handle
*
* This is defined in "qcom_q6v5_mss.c".
*/
void qcom_deregister_ipa_notify(struct rproc *rproc);
#else /* !IS_ENABLED(CONFIG_QCOM_Q6V5_IPA_NOTIFY) */
struct qcom_rproc_ipa_notify { /* empty */ };
#define qcom_add_ipa_notify_subdev(rproc, ipa_notify) /* no-op */
#define qcom_remove_ipa_notify_subdev(rproc, ipa_notify) /* no-op */
#endif /* !IS_ENABLED(CONFIG_QCOM_Q6V5_IPA_NOTIFY) */
#endif /* !__QCOM_Q6V5_IPA_NOTIFY_H__ */