1 /*
2 * Tegra host1x Syncpoints
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_SYNCPT_H
20 #define __HOST1X_SYNCPT_H
21
22 #include <linux/atomic.h>
23 #include <linux/host1x.h>
24 #include <linux/kernel.h>
25 #include <linux/sched.h>
26
27 #include "intr.h"
28
29 struct host1x;
30
31 /* Reserved for replacing an expired wait with a NOP */
32 #define HOST1X_SYNCPT_RESERVED 0
33
34 struct host1x_syncpt_base {
35 unsigned int id;
36 bool requested;
37 };
38
39 struct host1x_syncpt {
40 unsigned int id;
41 atomic_t min_val;
42 atomic_t max_val;
43 u32 base_val;
44 const char *name;
45 bool client_managed;
46 struct host1x *host;
47 struct host1x_client *client;
48 struct host1x_syncpt_base *base;
49
50 /* interrupt data */
51 struct host1x_syncpt_intr intr;
52 };
53
54 /* Initialize sync point array */
55 int host1x_syncpt_init(struct host1x *host);
56
57 /* Free sync point array */
58 void host1x_syncpt_deinit(struct host1x *host);
59
60 /* Return number of sync point supported. */
61 unsigned int host1x_syncpt_nb_pts(struct host1x *host);
62
63 /* Return number of wait bases supported. */
64 unsigned int host1x_syncpt_nb_bases(struct host1x *host);
65
66 /* Return number of mlocks supported. */
67 unsigned int host1x_syncpt_nb_mlocks(struct host1x *host);
68
69 /*
70 * Check sync point sanity. If max is larger than min, there have too many
71 * sync point increments.
72 *
73 * Client managed sync point are not tracked.
74 * */
host1x_syncpt_check_max(struct host1x_syncpt * sp,u32 real)75 static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real)
76 {
77 u32 max;
78 if (sp->client_managed)
79 return true;
80 max = host1x_syncpt_read_max(sp);
81 return (s32)(max - real) >= 0;
82 }
83
84 /* Return true if sync point is client managed. */
host1x_syncpt_client_managed(struct host1x_syncpt * sp)85 static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp)
86 {
87 return sp->client_managed;
88 }
89
90 /*
91 * Returns true if syncpoint min == max, which means that there are no
92 * outstanding operations.
93 */
host1x_syncpt_idle(struct host1x_syncpt * sp)94 static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp)
95 {
96 int min, max;
97 smp_rmb();
98 min = atomic_read(&sp->min_val);
99 max = atomic_read(&sp->max_val);
100 return (min == max);
101 }
102
103 /* Load current value from hardware to the shadow register. */
104 u32 host1x_syncpt_load(struct host1x_syncpt *sp);
105
106 /* Check if the given syncpoint value has already passed */
107 bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
108
109 /* Save host1x sync point state into shadow registers. */
110 void host1x_syncpt_save(struct host1x *host);
111
112 /* Reset host1x sync point state from shadow registers. */
113 void host1x_syncpt_restore(struct host1x *host);
114
115 /* Read current wait base value into shadow register and return it. */
116 u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
117
118 /* Indicate future operations by incrementing the sync point max. */
119 u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
120
121 /* Check if sync point id is valid. */
host1x_syncpt_is_valid(struct host1x_syncpt * sp)122 static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp)
123 {
124 return sp->id < host1x_syncpt_nb_pts(sp->host);
125 }
126
127 #endif
128
