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1/* SPDX-License-Identifier: GPL-2.0-only */2/*3 * Tegra host1x Command DMA4 *5 * Copyright (c) 2010-2013, NVIDIA Corporation.6 */7 8#ifndef __HOST1X_CDMA_H9#define __HOST1X_CDMA_H10 11#include <linux/sched.h>12#include <linux/completion.h>13#include <linux/list.h>14#include <linux/workqueue.h>15 16struct host1x_syncpt;17struct host1x_userctx_timeout;18struct host1x_job;19 20/*21 * cdma22 *23 * This is in charge of a host command DMA channel.24 * Sends ops to a push buffer, and takes responsibility for unpinning25 * (& possibly freeing) of memory after those ops have completed.26 * Producer:27 * begin28 * push - send ops to the push buffer29 * end - start command DMA and enqueue handles to be unpinned30 * Consumer:31 * update - call to update sync queue and push buffer, unpin memory32 */33 34struct push_buffer {35 void *mapped; /* mapped pushbuffer memory */36 dma_addr_t dma; /* device address of pushbuffer */37 dma_addr_t phys; /* physical address of pushbuffer */38 u32 fence; /* index we've written */39 u32 pos; /* index to write to */40 u32 size;41 u32 alloc_size;42};43 44struct buffer_timeout {45 struct delayed_work wq; /* work queue */46 bool initialized; /* timer one-time setup flag */47 struct host1x_syncpt *syncpt; /* buffer completion syncpt */48 u32 syncpt_val; /* syncpt value when completed */49 ktime_t start_ktime; /* starting time */50 /* context timeout information */51 struct host1x_client *client;52};53 54enum cdma_event {55 CDMA_EVENT_NONE, /* not waiting for any event */56 CDMA_EVENT_SYNC_QUEUE_EMPTY, /* wait for empty sync queue */57 CDMA_EVENT_PUSH_BUFFER_SPACE /* wait for space in push buffer */58};59 60struct host1x_cdma {61 struct mutex lock; /* controls access to shared state */62 struct completion complete; /* signalled when event occurs */63 enum cdma_event event; /* event that complete is waiting for */64 unsigned int slots_used; /* pb slots used in current submit */65 unsigned int slots_free; /* pb slots free in current submit */66 unsigned int first_get; /* DMAGET value, where submit begins */67 unsigned int last_pos; /* last value written to DMAPUT */68 struct push_buffer push_buffer; /* channel's push buffer */69 struct list_head sync_queue; /* job queue */70 struct buffer_timeout timeout; /* channel's timeout state/wq */71 bool running;72 bool torndown;73 struct work_struct update_work;74};75 76#define cdma_to_channel(cdma) container_of(cdma, struct host1x_channel, cdma)77#define cdma_to_host1x(cdma) dev_get_drvdata(cdma_to_channel(cdma)->dev->parent)78#define pb_to_cdma(pb) container_of(pb, struct host1x_cdma, push_buffer)79 80int host1x_cdma_init(struct host1x_cdma *cdma);81int host1x_cdma_deinit(struct host1x_cdma *cdma);82int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job);83void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2);84void host1x_cdma_push_wide(struct host1x_cdma *cdma, u32 op1, u32 op2,85 u32 op3, u32 op4);86void host1x_cdma_end(struct host1x_cdma *cdma, struct host1x_job *job);87void host1x_cdma_update(struct host1x_cdma *cdma);88void host1x_cdma_peek(struct host1x_cdma *cdma, u32 dmaget, int slot,89 u32 *out);90unsigned int host1x_cdma_wait_locked(struct host1x_cdma *cdma,91 enum cdma_event event);92void host1x_cdma_update_sync_queue(struct host1x_cdma *cdma,93 struct device *dev);94#endif95