tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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_syncpt;
26struct host1x;
27
28enum host1x_intr_action {
29 /*
30 * Perform cleanup after a submit has completed.
31 * 'data' points to a channel
32 */
33 HOST1X_INTR_ACTION_SUBMIT_COMPLETE = 0,
34
35 /*
36 * Wake up a task.
37 * 'data' points to a wait_queue_head_t
38 */
39 HOST1X_INTR_ACTION_WAKEUP,
40
41 /*
42 * Wake up a interruptible task.
43 * 'data' points to a wait_queue_head_t
44 */
45 HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
46
47 HOST1X_INTR_ACTION_COUNT
48};
49
50struct host1x_syncpt_intr {
51 spinlock_t lock;
52 struct list_head wait_head;
53 char thresh_irq_name[12];
54 struct work_struct work;
55};
56
57struct host1x_waitlist {
58 struct list_head list;
59 struct kref refcount;
60 u32 thresh;
61 enum host1x_intr_action action;
62 atomic_t state;
63 void *data;
64 int count;
65};
66
67/*
68 * Schedule an action to be taken when a sync point reaches the given threshold.
69 *
70 * @id the sync point
71 * @thresh the threshold
72 * @action the action to take
73 * @data a pointer to extra data depending on action, see above
74 * @waiter waiter structure - assumes ownership
75 * @ref must be passed if cancellation is possible, else NULL
76 *
77 * This is a non-blocking api.
78 */
79int host1x_intr_add_action(struct host1x *host, struct host1x_syncpt *syncpt,
80 u32 thresh, enum host1x_intr_action action,
81 void *data, struct host1x_waitlist *waiter,
82 void **ref);
83
84/*
85 * Unreference an action submitted to host1x_intr_add_action().
86 * You must call this if you passed non-NULL as ref.
87 * @ref the ref returned from host1x_intr_add_action()
88 */
89void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref);
90
91/* Initialize host1x sync point interrupt */
92int host1x_intr_init(struct host1x *host, unsigned int irq_sync);
93
94/* Deinitialize host1x sync point interrupt */
95void host1x_intr_deinit(struct host1x *host);
96
97/* Enable host1x sync point interrupt */
98void host1x_intr_start(struct host1x *host);
99
100/* Disable host1x sync point interrupt */
101void host1x_intr_stop(struct host1x *host);
102
103irqreturn_t host1x_syncpt_thresh_fn(void *dev_id);
104#endif