Merge branch 'for-linus' into for-next
[linux-2.6-microblaze.git] / drivers / gpu / host1x / intr.h
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
14 struct host1x_syncpt;
15 struct host1x;
16
17 enum 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_COUNT
37 };
38
39 struct host1x_syncpt_intr {
40         spinlock_t lock;
41         struct list_head wait_head;
42         char thresh_irq_name[12];
43         struct work_struct work;
44 };
45
46 struct host1x_waitlist {
47         struct list_head list;
48         struct kref refcount;
49         u32 thresh;
50         enum host1x_intr_action action;
51         atomic_t state;
52         void *data;
53         int count;
54 };
55
56 /*
57  * Schedule an action to be taken when a sync point reaches the given threshold.
58  *
59  * @id the sync point
60  * @thresh the threshold
61  * @action the action to take
62  * @data a pointer to extra data depending on action, see above
63  * @waiter waiter structure - assumes ownership
64  * @ref must be passed if cancellation is possible, else NULL
65  *
66  * This is a non-blocking api.
67  */
68 int host1x_intr_add_action(struct host1x *host, struct host1x_syncpt *syncpt,
69                            u32 thresh, enum host1x_intr_action action,
70                            void *data, struct host1x_waitlist *waiter,
71                            void **ref);
72
73 /*
74  * Unreference an action submitted to host1x_intr_add_action().
75  * You must call this if you passed non-NULL as ref.
76  * @ref the ref returned from host1x_intr_add_action()
77  * @flush wait until any pending handlers have completed before returning.
78  */
79 void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref,
80                          bool flush);
81
82 /* Initialize host1x sync point interrupt */
83 int host1x_intr_init(struct host1x *host, unsigned int irq_sync);
84
85 /* Deinitialize host1x sync point interrupt */
86 void host1x_intr_deinit(struct host1x *host);
87
88 /* Enable host1x sync point interrupt */
89 void host1x_intr_start(struct host1x *host);
90
91 /* Disable host1x sync point interrupt */
92 void host1x_intr_stop(struct host1x *host);
93
94 irqreturn_t host1x_syncpt_thresh_fn(void *dev_id);
95 #endif