drivers/gpu/host1x/syncpt.h

   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
  18 struct host1x;
  19
  20 /* Reserved for replacing an expired wait with a NOP */
  21 #define HOST1X_SYNCPT_RESERVED                  0
  22
  23 struct host1x_syncpt_base {
  24         unsigned int id;
  25         bool requested;
  26 };
  27
  28 struct 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  */
  44 int host1x_syncpt_init(struct host1x *host);
  45
  46 /*  Free sync point array */
  47 void host1x_syncpt_deinit(struct host1x *host);
  48
  49 /* Return number of sync point supported. */
  50 unsigned int host1x_syncpt_nb_pts(struct host1x *host);
  51
  52 /* Return number of wait bases supported. */
  53 unsigned int host1x_syncpt_nb_bases(struct host1x *host);
  54
  55 /* Return number of mlocks supported. */
  56 unsigned 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  * */
  64 static 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. */
  74 static 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  */
  83 static 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. */
  93 u32 host1x_syncpt_load(struct host1x_syncpt *sp);
  94
  95 /* Check if the given syncpoint value has already passed */
  96 bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
  97
  98 /* Save host1x sync point state into shadow registers. */
  99 void host1x_syncpt_save(struct host1x *host);
 100
 101 /* Reset host1x sync point state from shadow registers. */
 102 void host1x_syncpt_restore(struct host1x *host);
 103
 104 /* Read current wait base value into shadow register and return it. */
 105 u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
 106
 107 /* Indicate future operations by incrementing the sync point max. */
 108 u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
 109
 110 /* Check if sync point id is valid. */
 111 static 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