/* SPDX-License-Identifier: GPL-2.0-only *//* * Tegra host1x Command DMA * * Copyright (c) 2010-2013, NVIDIA Corporation. */ #ifndef __HOST1X_CDMA_H#define __HOST1X_CDMA_H #include <linux/sched.h>#include <linux/completion.h>#include <linux/list.h>#include <linux/workqueue.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 {	void *mapped;			/* mapped pushbuffer memory */	dma_addr_t dma;			/* device address of pushbuffer */	dma_addr_t phys;		/* physical address of pushbuffer */	u32 fence;			/* index we've written */	u32 pos;			/* index to write to */	u32 size;	u32 alloc_size;}; 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 */	struct host1x_client *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 completion complete;	/* signalled when event occurs */	enum cdma_event event;		/* event that complete 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;	struct work_struct update_work;}; #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);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_push_wide(struct host1x_cdma *cdma, u32 op1, u32 op2,			   u32 op3, u32 op4);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