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1/*
2 * Tegra host1x Interrupt Management
3 *
4 * Copyright (c) 2010-2013, NVIDIA Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19#ifndef __HOST1X_INTR_H
20#define __HOST1X_INTR_H
21
22#include <linux/interrupt.h>
23#include <linux/workqueue.h>
24
25struct host1x;
26
27enum host1x_intr_action {
28 /*
29 * Perform cleanup after a submit has completed.
30 * 'data' points to a channel
31 */
32 HOST1X_INTR_ACTION_SUBMIT_COMPLETE = 0,
33
34 /*
35 * Wake up a task.
36 * 'data' points to a wait_queue_head_t
37 */
38 HOST1X_INTR_ACTION_WAKEUP,
39
40 /*
41 * Wake up a interruptible task.
42 * 'data' points to a wait_queue_head_t
43 */
44 HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
45
46 HOST1X_INTR_ACTION_COUNT
47};
48
49struct host1x_syncpt_intr {
50 spinlock_t lock;
51 struct list_head wait_head;
52 char thresh_irq_name[12];
53 struct work_struct work;
54};
55
56struct host1x_waitlist {
57 struct list_head list;
58 struct kref refcount;
59 u32 thresh;
60 enum host1x_intr_action action;
61 atomic_t state;
62 void *data;
63 int count;
64};
65
66/*
67 * Schedule an action to be taken when a sync point reaches the given threshold.
68 *
69 * @id the sync point
70 * @thresh the threshold
71 * @action the action to take
72 * @data a pointer to extra data depending on action, see above
73 * @waiter waiter structure - assumes ownership
74 * @ref must be passed if cancellation is possible, else NULL
75 *
76 * This is a non-blocking api.
77 */
78int host1x_intr_add_action(struct host1x *host, u32 id, u32 thresh,
79 enum host1x_intr_action action, void *data,
80 struct host1x_waitlist *waiter, void **ref);
81
82/*
83 * Unreference an action submitted to host1x_intr_add_action().
84 * You must call this if you passed non-NULL as ref.
85 * @ref the ref returned from host1x_intr_add_action()
86 */
87void host1x_intr_put_ref(struct host1x *host, u32 id, void *ref);
88
89/* Initialize host1x sync point interrupt */
90int host1x_intr_init(struct host1x *host, unsigned int irq_sync);
91
92/* Deinitialize host1x sync point interrupt */
93void host1x_intr_deinit(struct host1x *host);
94
95/* Enable host1x sync point interrupt */
96void host1x_intr_start(struct host1x *host);
97
98/* Disable host1x sync point interrupt */
99void host1x_intr_stop(struct host1x *host);
100
101irqreturn_t host1x_syncpt_thresh_fn(void *dev_id);
102#endif
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_COUNT
37};
38
39struct 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
46struct 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 */
68int 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 */
78void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref);
79
80/* Initialize host1x sync point interrupt */
81int host1x_intr_init(struct host1x *host, unsigned int irq_sync);
82
83/* Deinitialize host1x sync point interrupt */
84void host1x_intr_deinit(struct host1x *host);
85
86/* Enable host1x sync point interrupt */
87void host1x_intr_start(struct host1x *host);
88
89/* Disable host1x sync point interrupt */
90void host1x_intr_stop(struct host1x *host);
91
92irqreturn_t host1x_syncpt_thresh_fn(void *dev_id);
93#endif