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/*
* Tegra host1x Command DMA
*
* Copyright (c) 2010-2013, NVIDIA Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __HOST1X_CDMA_H
#define __HOST1X_CDMA_H
#include <linux/sched.h>
#include <linux/semaphore.h>
#include <linux/list.h>
struct host1x_syncpt;
struct host1x_userctx_timeout;
struct host1x_job;
/*
* cdma
*
* This is in charge of a host command DMA channel.
* Sends ops to a push buffer, and takes responsibility for unpinning
* (& possibly freeing) of memory after those ops have completed.
* Producer:
* begin
* push - send ops to the push buffer
* end - start command DMA and enqueue handles to be unpinned
* Consumer:
* update - call to update sync queue and push buffer, unpin memory
*/
struct push_buffer {
u32 *mapped; /* mapped pushbuffer memory */
dma_addr_t phys; /* physical address of pushbuffer */
u32 fence; /* index we've written */
u32 pos; /* index to write to */
u32 size_bytes;
};
struct buffer_timeout {
struct delayed_work wq; /* work queue */
bool initialized; /* timer one-time setup flag */
struct host1x_syncpt *syncpt; /* buffer completion syncpt */
u32 syncpt_val; /* syncpt value when completed */
ktime_t start_ktime; /* starting time */
/* context timeout information */
int client;
};
enum cdma_event {
CDMA_EVENT_NONE, /* not waiting for any event */
CDMA_EVENT_SYNC_QUEUE_EMPTY, /* wait for empty sync queue */
CDMA_EVENT_PUSH_BUFFER_SPACE /* wait for space in push buffer */
};
struct host1x_cdma {
struct mutex lock; /* controls access to shared state */
struct semaphore sem; /* signalled when event occurs */
enum cdma_event event; /* event that sem is waiting for */
unsigned int slots_used; /* pb slots used in current submit */
unsigned int slots_free; /* pb slots free in current submit */
unsigned int first_get; /* DMAGET value, where submit begins */
unsigned int last_pos; /* last value written to DMAPUT */
struct push_buffer push_buffer; /* channel's push buffer */
struct list_head sync_queue; /* job queue */
struct buffer_timeout timeout; /* channel's timeout state/wq */
bool running;
bool torndown;
};
#define cdma_to_channel(cdma) container_of(cdma, struct host1x_channel, cdma)
#define cdma_to_host1x(cdma) dev_get_drvdata(cdma_to_channel(cdma)->dev->parent)
#define pb_to_cdma(pb) container_of(pb, struct host1x_cdma, push_buffer)
int host1x_cdma_init(struct host1x_cdma *cdma);
int host1x_cdma_deinit(struct host1x_cdma *cdma);
void host1x_cdma_stop(struct host1x_cdma *cdma);
int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job);
void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2);
void host1x_cdma_end(struct host1x_cdma *cdma, struct host1x_job *job);
void host1x_cdma_update(struct host1x_cdma *cdma);
void host1x_cdma_peek(struct host1x_cdma *cdma, u32 dmaget, int slot,
u32 *out);
unsigned int host1x_cdma_wait_locked(struct host1x_cdma *cdma,
enum cdma_event event);
void host1x_cdma_update_sync_queue(struct host1x_cdma *cdma,
struct device *dev);
#endif
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