intr.h revision 6579324a41cc414009a601738b70a53d6376325c 
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
103