drivers/gpu/host1x/intr.h

   1 /*
   2  * Tegra host1x Interrupt Management
   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_INTR_H
  20 #define __HOST1X_INTR_H
  21
  22 #include <linux/interrupt.h>
  23 #include <linux/workqueue.h>
  24
  25 struct host1x;
  26
  27 enum host1x_intr_action {
  28         /*
  29          * Perform cleanup after a submit has completed.
  30          * 'data' points to a channel
  31          */
  32         HOST1X_INTR_ACTION_SUBMIT_COMPLETE = 0,
  33
  34         /*
  35          * Wake up a  task.
  36          * 'data' points to a wait_queue_head_t
  37          */
  38         HOST1X_INTR_ACTION_WAKEUP,
  39
  40         /*
  41          * Wake up a interruptible task.
  42          * 'data' points to a wait_queue_head_t
  43          */
  44         HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
  45
  46         HOST1X_INTR_ACTION_COUNT
  47 };
  48
  49 struct host1x_syncpt_intr {
  50         spinlock_t lock;
  51         struct list_head wait_head;
  52         char thresh_irq_name[12];
  53         struct work_struct work;
  54 };
  55
  56 struct host1x_waitlist {
  57         struct list_head list;
  58         struct kref refcount;
  59         u32 thresh;
  60         enum host1x_intr_action action;
  61         atomic_t state;
  62         void *data;
  63         int count;
  64 };
  65
  66 /*
  67  * Schedule an action to be taken when a sync point reaches the given threshold.
  68  *
  69  * @id the sync point
  70  * @thresh the threshold
  71  * @action the action to take
  72  * @data a pointer to extra data depending on action, see above
  73  * @waiter waiter structure - assumes ownership
  74  * @ref must be passed if cancellation is possible, else NULL
  75  *
  76  * This is a non-blocking api.
  77  */
  78 int host1x_intr_add_action(struct host1x *host, u32 id, u32 thresh,
  79         enum host1x_intr_action action, void *data,
  80         struct host1x_waitlist *waiter, void **ref);
  81
  82 /*
  83  * Unreference an action submitted to host1x_intr_add_action().
  84  * You must call this if you passed non-NULL as ref.
  85  * @ref the ref returned from host1x_intr_add_action()
  86  */
  87 void host1x_intr_put_ref(struct host1x *host, u32 id, void *ref);
  88
  89 /* Initialize host1x sync point interrupt */
  90 int host1x_intr_init(struct host1x *host, unsigned int irq_sync);
  91
  92 /* Deinitialize host1x sync point interrupt */
  93 void host1x_intr_deinit(struct host1x *host);
  94
  95 /* Enable host1x sync point interrupt */
  96 void host1x_intr_start(struct host1x *host);
  97
  98 /* Disable host1x sync point interrupt */
  99 void host1x_intr_stop(struct host1x *host);
 100
 101 irqreturn_t host1x_syncpt_thresh_fn(void *dev_id);
 102 #endif