LXR linux/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
  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
 117