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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/sched.h>
15
16#include "intr.h"
17
18struct host1x;
19
20/* Reserved for replacing an expired wait with a NOP */
21#define HOST1X_SYNCPT_RESERVED 0
22
23struct host1x_syncpt_base {
24 unsigned int id;
25 bool requested;
26};
27
28struct host1x_syncpt {
29 unsigned int id;
30 atomic_t min_val;
31 atomic_t max_val;
32 u32 base_val;
33 const char *name;
34 bool client_managed;
35 struct host1x *host;
36 struct host1x_client *client;
37 struct host1x_syncpt_base *base;
38
39 /* interrupt data */
40 struct host1x_syncpt_intr intr;
41};
42
43/* Initialize sync point array */
44int host1x_syncpt_init(struct host1x *host);
45
46/* Free sync point array */
47void host1x_syncpt_deinit(struct host1x *host);
48
49/* Return number of sync point supported. */
50unsigned int host1x_syncpt_nb_pts(struct host1x *host);
51
52/* Return number of wait bases supported. */
53unsigned int host1x_syncpt_nb_bases(struct host1x *host);
54
55/* Return number of mlocks supported. */
56unsigned int host1x_syncpt_nb_mlocks(struct host1x *host);
57
58/*
59 * Check sync point sanity. If max is larger than min, there have too many
60 * sync point increments.
61 *
62 * Client managed sync point are not tracked.
63 * */
64static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real)
65{
66 u32 max;
67 if (sp->client_managed)
68 return true;
69 max = host1x_syncpt_read_max(sp);
70 return (s32)(max - real) >= 0;
71}
72
73/* Return true if sync point is client managed. */
74static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp)
75{
76 return sp->client_managed;
77}
78
79/*
80 * Returns true if syncpoint min == max, which means that there are no
81 * outstanding operations.
82 */
83static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp)
84{
85 int min, max;
86 smp_rmb();
87 min = atomic_read(&sp->min_val);
88 max = atomic_read(&sp->max_val);
89 return (min == max);
90}
91
92/* Load current value from hardware to the shadow register. */
93u32 host1x_syncpt_load(struct host1x_syncpt *sp);
94
95/* Check if the given syncpoint value has already passed */
96bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
97
98/* Save host1x sync point state into shadow registers. */
99void host1x_syncpt_save(struct host1x *host);
100
101/* Reset host1x sync point state from shadow registers. */
102void host1x_syncpt_restore(struct host1x *host);
103
104/* Read current wait base value into shadow register and return it. */
105u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
106
107/* Indicate future operations by incrementing the sync point max. */
108u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
109
110/* Check if sync point id is valid. */
111static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp)
112{
113 return sp->id < host1x_syncpt_nb_pts(sp->host);
114}
115
116#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/* Initialize sync point array */
46int host1x_syncpt_init(struct host1x *host);
47
48/* Free sync point array */
49void host1x_syncpt_deinit(struct host1x *host);
50
51/* Return number of sync point supported. */
52unsigned int host1x_syncpt_nb_pts(struct host1x *host);
53
54/* Return number of wait bases supported. */
55unsigned int host1x_syncpt_nb_bases(struct host1x *host);
56
57/* Return number of mlocks supported. */
58unsigned int host1x_syncpt_nb_mlocks(struct host1x *host);
59
60/*
61 * Check sync point sanity. If max is larger than min, there have too many
62 * sync point increments.
63 *
64 * Client managed sync point are not tracked.
65 * */
66static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real)
67{
68 u32 max;
69 if (sp->client_managed)
70 return true;
71 max = host1x_syncpt_read_max(sp);
72 return (s32)(max - real) >= 0;
73}
74
75/* Return true if sync point is client managed. */
76static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp)
77{
78 return sp->client_managed;
79}
80
81/*
82 * Returns true if syncpoint min == max, which means that there are no
83 * outstanding operations.
84 */
85static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp)
86{
87 int min, max;
88 smp_rmb();
89 min = atomic_read(&sp->min_val);
90 max = atomic_read(&sp->max_val);
91 return (min == max);
92}
93
94/* Load current value from hardware to the shadow register. */
95u32 host1x_syncpt_load(struct host1x_syncpt *sp);
96
97/* Check if the given syncpoint value has already passed */
98bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
99
100/* Save host1x sync point state into shadow registers. */
101void host1x_syncpt_save(struct host1x *host);
102
103/* Reset host1x sync point state from shadow registers. */
104void host1x_syncpt_restore(struct host1x *host);
105
106/* Read current wait base value into shadow register and return it. */
107u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
108
109/* Indicate future operations by incrementing the sync point max. */
110u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
111
112/* Check if sync point id is valid. */
113static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp)
114{
115 return sp->id < host1x_syncpt_nb_pts(sp->host);
116}
117
118#endif