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/*
* drivers/video/tegra/host/nvhost_cdma.h
*
* Tegra Graphics Host Command DMA
*
* Copyright (c) 2010-2012, 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 __NVHOST_CDMA_H
#define __NVHOST_CDMA_H
#include <linux/sched.h>
#include <linux/semaphore.h>
#include <linux/nvhost.h>
#include <linux/nvmap.h>
#include <linux/list.h>
struct nvhost_syncpt;
struct nvhost_userctx_timeout;
struct nvhost_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 nvmap_client_handle {
struct nvmap_client *client;
struct nvmap_handle *handle;
};
struct push_buffer {
struct nvmap_handle_ref *mem; /* handle to pushbuffer memory */
u32 *mapped; /* mapped pushbuffer memory */
u32 phys; /* physical address of pushbuffer */
u32 fence; /* index we've written */
u32 cur; /* index to write to */
struct nvmap_client_handle *nvmap;
/* nvmap handle for each opcode pair */
};
struct syncpt_buffer {
struct nvmap_handle_ref *mem; /* handle to pushbuffer memory */
u32 *mapped; /* mapped gather buffer (at channel offset */
u32 phys; /* physical address (at channel offset) */
u32 incr_per_buffer; /* max # of incrs per GATHER */
u32 words_per_incr; /* # of DWORDS in buffer to incr a syncpt */
};
struct buffer_timeout {
struct delayed_work wq; /* work queue */
bool initialized; /* timer one-time setup flag */
u32 syncpt_id; /* buffer completion syncpt id */
u32 syncpt_val; /* syncpt value when completed */
ktime_t start_ktime; /* starting time */
/* context timeout information */
struct nvhost_hwctx *ctx;
int clientid;
};
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 nvhost_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_put; /* 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 nvhost_channel, cdma)
#define cdma_to_dev(cdma) nvhost_get_host(cdma_to_channel(cdma)->dev)
#define cdma_to_nvmap(cdma) ((cdma_to_dev(cdma))->nvmap)
#define pb_to_cdma(pb) container_of(pb, struct nvhost_cdma, push_buffer)
int nvhost_cdma_init(struct nvhost_cdma *cdma);
void nvhost_cdma_deinit(struct nvhost_cdma *cdma);
void nvhost_cdma_stop(struct nvhost_cdma *cdma);
int nvhost_cdma_begin(struct nvhost_cdma *cdma, struct nvhost_job *job);
void nvhost_cdma_push(struct nvhost_cdma *cdma, u32 op1, u32 op2);
void nvhost_cdma_push_gather(struct nvhost_cdma *cdma,
struct nvmap_client *client,
struct nvmap_handle *handle, u32 offset, u32 op1, u32 op2);
void nvhost_cdma_end(struct nvhost_cdma *cdma,
struct nvhost_job *job);
void nvhost_cdma_update(struct nvhost_cdma *cdma);
int nvhost_cdma_flush(struct nvhost_cdma *cdma, int timeout);
void nvhost_cdma_peek(struct nvhost_cdma *cdma,
u32 dmaget, int slot, u32 *out);
unsigned int nvhost_cdma_wait_locked(struct nvhost_cdma *cdma,
enum cdma_event event);
void nvhost_cdma_update_sync_queue(struct nvhost_cdma *cdma,
struct nvhost_syncpt *syncpt, struct device *dev);
#endif
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