1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Tegra host1x Syncpoints
5 * Copyright (c) 2010-2013, NVIDIA Corporation.
8 #ifndef __HOST1X_SYNCPT_H
9 #define __HOST1X_SYNCPT_H
11 #include <linux/atomic.h>
12 #include <linux/host1x.h>
13 #include <linux/kernel.h>
14 #include <linux/sched.h>
20 /* Reserved for replacing an expired wait with a NOP */
21 #define HOST1X_SYNCPT_RESERVED 0
23 struct host1x_syncpt_base {
28 struct host1x_syncpt {
36 struct host1x_client *client;
37 struct host1x_syncpt_base *base;
40 struct host1x_syncpt_intr intr;
43 /* Initialize sync point array */
44 int host1x_syncpt_init(struct host1x *host);
46 /* Free sync point array */
47 void host1x_syncpt_deinit(struct host1x *host);
49 /* Return number of sync point supported. */
50 unsigned int host1x_syncpt_nb_pts(struct host1x *host);
52 /* Return number of wait bases supported. */
53 unsigned int host1x_syncpt_nb_bases(struct host1x *host);
55 /* Return number of mlocks supported. */
56 unsigned int host1x_syncpt_nb_mlocks(struct host1x *host);
59 * Check sync point sanity. If max is larger than min, there have too many
60 * sync point increments.
62 * Client managed sync point are not tracked.
64 static inline bool host1x_syncpt_check_max(struct host1x_syncpt *sp, u32 real)
67 if (sp->client_managed)
69 max = host1x_syncpt_read_max(sp);
70 return (s32)(max - real) >= 0;
73 /* Return true if sync point is client managed. */
74 static inline bool host1x_syncpt_client_managed(struct host1x_syncpt *sp)
76 return sp->client_managed;
80 * Returns true if syncpoint min == max, which means that there are no
81 * outstanding operations.
83 static inline bool host1x_syncpt_idle(struct host1x_syncpt *sp)
87 min = atomic_read(&sp->min_val);
88 max = atomic_read(&sp->max_val);
92 /* Load current value from hardware to the shadow register. */
93 u32 host1x_syncpt_load(struct host1x_syncpt *sp);
95 /* Check if the given syncpoint value has already passed */
96 bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
98 /* Save host1x sync point state into shadow registers. */
99 void host1x_syncpt_save(struct host1x *host);
101 /* Reset host1x sync point state from shadow registers. */
102 void host1x_syncpt_restore(struct host1x *host);
104 /* Read current wait base value into shadow register and return it. */
105 u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
107 /* Indicate future operations by incrementing the sync point max. */
108 u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
110 /* Check if sync point id is valid. */
111 static inline int host1x_syncpt_is_valid(struct host1x_syncpt *sp)
113 return sp->id < host1x_syncpt_nb_pts(sp->host);