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_syncpt;
  26 struct host1x;
  27
  28 enum host1x_intr_action {
  29         /*
  30          * Perform cleanup after a submit has completed.
  31          * 'data' points to a channel
  32          */
  33         HOST1X_INTR_ACTION_SUBMIT_COMPLETE = 0,
  34
  35         /*
  36          * Wake up a  task.
  37          * 'data' points to a wait_queue_head_t
  38          */
  39         HOST1X_INTR_ACTION_WAKEUP,
  40
  41         /*
  42          * Wake up a interruptible task.
  43          * 'data' points to a wait_queue_head_t
  44          */
  45         HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
  46
  47         HOST1X_INTR_ACTION_COUNT
  48 };
  49
  50 struct host1x_syncpt_intr {
  51         spinlock_t lock;
  52         struct list_head wait_head;
  53         char thresh_irq_name[12];
  54         struct work_struct work;
  55 };
  56
  57 struct host1x_waitlist {
  58         struct list_head list;
  59         struct kref refcount;
  60         u32 thresh;
  61         enum host1x_intr_action action;
  62         atomic_t state;
  63         void *data;
  64         int count;
  65 };
  66
  67 /*
  68  * Schedule an action to be taken when a sync point reaches the given threshold.
  69  *
  70  * @id the sync point
  71  * @thresh the threshold
  72  * @action the action to take
  73  * @data a pointer to extra data depending on action, see above
  74  * @waiter waiter structure - assumes ownership
  75  * @ref must be passed if cancellation is possible, else NULL
  76  *
  77  * This is a non-blocking api.
  78  */
  79 int host1x_intr_add_action(struct host1x *host, struct host1x_syncpt *syncpt,
  80                            u32 thresh, enum host1x_intr_action action,
  81                            void *data, struct host1x_waitlist *waiter,
  82                            void **ref);
  83
  84 /*
  85  * Unreference an action submitted to host1x_intr_add_action().
  86  * You must call this if you passed non-NULL as ref.
  87  * @ref the ref returned from host1x_intr_add_action()
  88  */
  89 void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref);
  90
  91 /* Initialize host1x sync point interrupt */
  92 int host1x_intr_init(struct host1x *host, unsigned int irq_sync);
  93
  94 /* Deinitialize host1x sync point interrupt */
  95 void host1x_intr_deinit(struct host1x *host);
  96
  97 /* Enable host1x sync point interrupt */
  98 void host1x_intr_start(struct host1x *host);
  99
 100 /* Disable host1x sync point interrupt */
 101 void host1x_intr_stop(struct host1x *host);
 102
 103 irqreturn_t host1x_syncpt_thresh_fn(void *dev_id);
 104 #endif