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 */
78 void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref);
79
80 /* Initialize host1x sync point interrupt */
81 int host1x_intr_init(struct host1x *host, unsigned int irq_sync);
82
83 /* Deinitialize host1x sync point interrupt */
84 void host1x_intr_deinit(struct host1x *host);
85
86 /* Enable host1x sync point interrupt */
87 void host1x_intr_start(struct host1x *host);
88
89 /* Disable host1x sync point interrupt */
90 void host1x_intr_stop(struct host1x *host);
91
92 irqreturn_t host1x_syncpt_thresh_fn(void *dev_id);
93 #endif