1/* SPDX-License-Identifier: GPL-2.0-only */
 2/*
 3 * Tegra host1x Interrupt Management
 4 *
 5 * Copyright (c) 2010-2013, NVIDIA Corporation.
 6 */
 7
 8#ifndef __HOST1X_INTR_H
 9#define __HOST1X_INTR_H
10
11#include <linux/interrupt.h>
12#include <linux/workqueue.h>
13
14struct host1x_syncpt;
15struct host1x;
16
17enum host1x_intr_action {
18	/*
19	 * Perform cleanup after a submit has completed.
20	 * 'data' points to a channel
21	 */
22	HOST1X_INTR_ACTION_SUBMIT_COMPLETE = 0,
23
24	/*
25	 * Wake up a  task.
26	 * 'data' points to a wait_queue_head_t
27	 */
28	HOST1X_INTR_ACTION_WAKEUP,
29
30	/*
31	 * Wake up a interruptible task.
32	 * 'data' points to a wait_queue_head_t
33	 */
34	HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
35
36	HOST1X_INTR_ACTION_SIGNAL_FENCE,
37
38	HOST1X_INTR_ACTION_COUNT
39};
40
41struct host1x_syncpt_intr {
42	spinlock_t lock;
43	struct list_head wait_head;
44	char thresh_irq_name[12];
45	struct work_struct work;
46};
47
48struct host1x_waitlist {
49	struct list_head list;
50	struct kref refcount;
51	u32 thresh;
52	enum host1x_intr_action action;
53	atomic_t state;
54	void *data;
55	int count;
56};
57
58/*
59 * Schedule an action to be taken when a sync point reaches the given threshold.
60 *
61 * @id the sync point
62 * @thresh the threshold
63 * @action the action to take
64 * @data a pointer to extra data depending on action, see above
65 * @waiter waiter structure - assumes ownership
66 * @ref must be passed if cancellation is possible, else NULL
67 *
68 * This is a non-blocking api.
69 */
70int host1x_intr_add_action(struct host1x *host, struct host1x_syncpt *syncpt,
71			   u32 thresh, enum host1x_intr_action action,
72			   void *data, struct host1x_waitlist *waiter,
73			   void **ref);
74
75/*
76 * Unreference an action submitted to host1x_intr_add_action().
77 * You must call this if you passed non-NULL as ref.
78 * @ref the ref returned from host1x_intr_add_action()
79 * @flush wait until any pending handlers have completed before returning.
80 */
81void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref,
82			 bool flush);
83
84/* Initialize host1x sync point interrupt */
85int host1x_intr_init(struct host1x *host, unsigned int irq_sync);
86
87/* Deinitialize host1x sync point interrupt */
88void host1x_intr_deinit(struct host1x *host);
89
90/* Enable host1x sync point interrupt */
91void host1x_intr_start(struct host1x *host);
92
93/* Disable host1x sync point interrupt */
94void host1x_intr_stop(struct host1x *host);
95
96irqreturn_t host1x_syncpt_thresh_fn(void *dev_id);
97#endif