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
  29 struct host1x;
  30
  31 /* Reserved for replacing an expired wait with a NOP */
  32 #define HOST1X_SYNCPT_RESERVED                  0
  33
  34 struct host1x_syncpt_base {
  35         unsigned int id;
  36         bool requested;
  37 };
  38
  39 struct host1x_syncpt {
  40         unsigned 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 host1x_client *client;
  48         struct host1x_syncpt_base *base;
  49
  50         /* interrupt data */
  51         struct host1x_syncpt_intr intr;
  52 };
  53
  54 /* Initialize sync point array  */
  55 int host1x_syncpt_init(struct host1x *host);
  56
  57 /*  Free sync point array */
  58 void host1x_syncpt_deinit(struct host1x *host);
  59
  60 /* Return number of sync point supported. */
  61 unsigned int host1x_syncpt_nb_pts(struct host1x *host);
  62
  63 /* Return number of wait bases supported. */
  64 unsigned int host1x_syncpt_nb_bases(struct host1x *host);
  65
  66 /* Return number of mlocks supported. */
  67 unsigned int 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  * */
  75 static 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. */
  85 static 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  */
  94 static 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. */
 104 u32 host1x_syncpt_load(struct host1x_syncpt *sp);
 105
 106 /* Check if the given syncpoint value has already passed */
 107 bool host1x_syncpt_is_expired(struct host1x_syncpt *sp, u32 thresh);
 108
 109 /* Save host1x sync point state into shadow registers. */
 110 void host1x_syncpt_save(struct host1x *host);
 111
 112 /* Reset host1x sync point state from shadow registers. */
 113 void host1x_syncpt_restore(struct host1x *host);
 114
 115 /* Read current wait base value into shadow register and return it. */
 116 u32 host1x_syncpt_load_wait_base(struct host1x_syncpt *sp);
 117
 118 /* Indicate future operations by incrementing the sync point max. */
 119 u32 host1x_syncpt_incr_max(struct host1x_syncpt *sp, u32 incrs);
 120
 121 /* Check if sync point id is valid. */
 122 static 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 */
 128 int host1x_syncpt_patch_wait(struct host1x_syncpt *sp, void *patch_addr);
 129
 130 #endif