LXR linux/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
  25struct host1x;
  26
  27enum 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
  49struct 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
  56struct 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 */
  78int 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 */
  87void host1x_intr_put_ref(struct host1x *host, u32 id, void *ref);
  88
  89/* Initialize host1x sync point interrupt */
  90int host1x_intr_init(struct host1x *host, unsigned int irq_sync);
  91
  92/* Deinitialize host1x sync point interrupt */
  93void host1x_intr_deinit(struct host1x *host);
  94
  95/* Enable host1x sync point interrupt */
  96void host1x_intr_start(struct host1x *host);
  97
  98/* Disable host1x sync point interrupt */
  99void host1x_intr_stop(struct host1x *host);
 100
 101irqreturn_t host1x_syncpt_thresh_fn(void *dev_id);
 102#endif
 103