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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
29struct host1x;
30
31/* Reserved for replacing an expired wait with a NOP */
32#define HOST1X_SYNCPT_RESERVED 0
33
34struct host1x_syncpt_base {
35 unsigned int id;
36 bool requested;
37};
38
39struct host1x_syncpt {
40 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 device *dev;
48 struct host1x_syncpt_base *base;
49
50 /* interrupt data */
51 struct host1x_syncpt_intr intr;
52};
53
54/* Initialize sync point array */
55int host1x_syncpt_init(struct host1x *host);
56
57/* Free sync point array */
58void host1x_syncpt_deinit(struct host1x *host);
59
60/* Return number of sync point supported. */
61int host1x_syncpt_nb_pts(struct host1x *host);
62
63/* Return number of wait bases supported. */
64int host1x_syncpt_nb_bases(struct host1x *host);
65
66/* Return number of mlocks supported. */
67int 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 * */
75static 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. */
85static 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 */
94static 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. */
104u32 host1x_syncpt_load(struct host1x_syncpt *sp);
105
106/* Check if the given syncpoint value has already passed */
107bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
108
109/* Save host1x sync point state into shadow registers. */
110void host1x_syncpt_save(struct host1x *host);
111
112/* Reset host1x sync point state from shadow registers. */
113void host1x_syncpt_restore(struct host1x *host);
114
115/* Read current wait base value into shadow register and return it. */
116u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
117
118/* Indicate future operations by incrementing the sync point max. */
119u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
120
121/* Check if sync point id is valid. */
122static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp)
123{
124 return sp->id < host1x_syncpt_nb_pts(sp->host);
125}
126
127/* Patch a wait by replacing it with a wait for syncpt 0 value 0 */
128int host1x_syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr);
129
130#endif
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Tegra host1x Syncpoints
4 *
5 * Copyright (c) 2010-2013, NVIDIA Corporation.
6 */
7
8#ifndef __HOST1X_SYNCPT_H
9#define __HOST1X_SYNCPT_H
10
11#include <linux/atomic.h>
12#include <linux/host1x.h>
13#include <linux/kernel.h>
14#include <linux/kref.h>
15#include <linux/sched.h>
16
17#include "intr.h"
18
19struct host1x;
20
21/* Reserved for replacing an expired wait with a NOP */
22#define HOST1X_SYNCPT_RESERVED 0
23
24struct host1x_syncpt_base {
25 unsigned int id;
26 bool requested;
27};
28
29struct host1x_syncpt {
30 struct kref ref;
31
32 unsigned int id;
33 atomic_t min_val;
34 atomic_t max_val;
35 u32 base_val;
36 const char *name;
37 bool client_managed;
38 struct host1x *host;
39 struct host1x_syncpt_base *base;
40
41 /* interrupt data */
42 struct host1x_syncpt_intr intr;
43
44 /*
45 * If a submission incrementing this syncpoint fails, lock it so that
46 * further submission cannot be made until application has handled the
47 * failure.
48 */
49 bool locked;
50};
51
52/* Initialize sync point array */
53int host1x_syncpt_init(struct host1x *host);
54
55/* Free sync point array */
56void host1x_syncpt_deinit(struct host1x *host);
57
58/* Return number of sync point supported. */
59unsigned int host1x_syncpt_nb_pts(struct host1x *host);
60
61/* Return number of wait bases supported. */
62unsigned int host1x_syncpt_nb_bases(struct host1x *host);
63
64/* Return number of mlocks supported. */
65unsigned int host1x_syncpt_nb_mlocks(struct host1x *host);
66
67/*
68 * Check sync point sanity. If max is larger than min, there have too many
69 * sync point increments.
70 *
71 * Client managed sync point are not tracked.
72 * */
73static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real)
74{
75 u32 max;
76 if (sp->client_managed)
77 return true;
78 max = host1x_syncpt_read_max(sp);
79 return (s32)(max - real) >= 0;
80}
81
82/* Return true if sync point is client managed. */
83static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp)
84{
85 return sp->client_managed;
86}
87
88/*
89 * Returns true if syncpoint min == max, which means that there are no
90 * outstanding operations.
91 */
92static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp)
93{
94 int min, max;
95 smp_rmb();
96 min = atomic_read(&sp->min_val);
97 max = atomic_read(&sp->max_val);
98 return (min == max);
99}
100
101/* Load current value from hardware to the shadow register. */
102u32 host1x_syncpt_load(struct host1x_syncpt *sp);
103
104/* Check if the given syncpoint value has already passed */
105bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
106
107/* Save host1x sync point state into shadow registers. */
108void host1x_syncpt_save(struct host1x *host);
109
110/* Reset host1x sync point state from shadow registers. */
111void host1x_syncpt_restore(struct host1x *host);
112
113/* Read current wait base value into shadow register and return it. */
114u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
115
116/* Indicate future operations by incrementing the sync point max. */
117u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
118
119/* Check if sync point id is valid. */
120static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp)
121{
122 return sp->id < host1x_syncpt_nb_pts(sp->host);
123}
124
125static inline void host1x_syncpt_set_locked(struct host1x_syncpt *sp)
126{
127 sp->locked = true;
128}
129
130#endif