LXR linux/drivers/gpu/host1x/syncpt.h

   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
 131