drivers/gpu/host1x/cdma.h

   1 /*
   2  * Tegra host1x Command DMA
   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_CDMA_H
  20 #define __HOST1X_CDMA_H
  21
  22 #include <linux/sched.h>
  23 #include <linux/semaphore.h>
  24 #include <linux/list.h>
  25
  26 struct host1x_syncpt;
  27 struct host1x_userctx_timeout;
  28 struct host1x_job;
  29
  30 /*
  31  * cdma
  32  *
  33  * This is in charge of a host command DMA channel.
  34  * Sends ops to a push buffer, and takes responsibility for unpinning
  35  * (& possibly freeing) of memory after those ops have completed.
  36  * Producer:
  37  *      begin
  38  *              push - send ops to the push buffer
  39  *      end - start command DMA and enqueue handles to be unpinned
  40  * Consumer:
  41  *      update - call to update sync queue and push buffer, unpin memory
  42  */
  43
  44 struct push_buffer {
  45         u32 *mapped;                    /* mapped pushbuffer memory */
  46         dma_addr_t phys;                /* physical address of pushbuffer */
  47         u32 fence;                      /* index we've written */
  48         u32 pos;                        /* index to write to */
  49         u32 size_bytes;
  50 };
  51
  52 struct buffer_timeout {
  53         struct delayed_work wq;         /* work queue */
  54         bool initialized;               /* timer one-time setup flag */
  55         struct host1x_syncpt *syncpt;   /* buffer completion syncpt */
  56         u32 syncpt_val;                 /* syncpt value when completed */
  57         ktime_t start_ktime;            /* starting time */
  58         /* context timeout information */
  59         int client;
  60 };
  61
  62 enum cdma_event {
  63         CDMA_EVENT_NONE,                /* not waiting for any event */
  64         CDMA_EVENT_SYNC_QUEUE_EMPTY,    /* wait for empty sync queue */
  65         CDMA_EVENT_PUSH_BUFFER_SPACE    /* wait for space in push buffer */
  66 };
  67
  68 struct host1x_cdma {
  69         struct mutex lock;              /* controls access to shared state */
  70         struct semaphore sem;           /* signalled when event occurs */
  71         enum cdma_event event;          /* event that sem is waiting for */
  72         unsigned int slots_used;        /* pb slots used in current submit */
  73         unsigned int slots_free;        /* pb slots free in current submit */
  74         unsigned int first_get;         /* DMAGET value, where submit begins */
  75         unsigned int last_pos;          /* last value written to DMAPUT */
  76         struct push_buffer push_buffer; /* channel's push buffer */
  77         struct list_head sync_queue;    /* job queue */
  78         struct buffer_timeout timeout;  /* channel's timeout state/wq */
  79         bool running;
  80         bool torndown;
  81 };
  82
  83 #define cdma_to_channel(cdma) container_of(cdma, struct host1x_channel, cdma)
  84 #define cdma_to_host1x(cdma) dev_get_drvdata(cdma_to_channel(cdma)->dev->parent)
  85 #define pb_to_cdma(pb) container_of(pb, struct host1x_cdma, push_buffer)
  86
  87 int host1x_cdma_init(struct host1x_cdma *cdma);
  88 int host1x_cdma_deinit(struct host1x_cdma *cdma);
  89 void host1x_cdma_stop(struct host1x_cdma *cdma);
  90 int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job);
  91 void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2);
  92 void host1x_cdma_end(struct host1x_cdma *cdma, struct host1x_job *job);
  93 void host1x_cdma_update(struct host1x_cdma *cdma);
  94 void host1x_cdma_peek(struct host1x_cdma *cdma, u32 dmaget, int slot,
  95                       u32 *out);
  96 unsigned int host1x_cdma_wait_locked(struct host1x_cdma *cdma,
  97                                      enum cdma_event event);
  98 void host1x_cdma_update_sync_queue(struct host1x_cdma *cdma,
  99                                    struct device *dev);
 100 #endif