1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Tegra host1x Command DMA
4 *
5 * Copyright (c) 2010-2013, NVIDIA Corporation.
6 */
7
8 #ifndef __HOST1X_CDMA_H
9 #define __HOST1X_CDMA_H
10
11 #include <linux/sched.h>
12 #include <linux/completion.h>
13 #include <linux/list.h>
14
15 struct host1x_syncpt;
16 struct host1x_userctx_timeout;
17 struct host1x_job;
18
19 /*
20 * cdma
21 *
22 * This is in charge of a host command DMA channel.
23 * Sends ops to a push buffer, and takes responsibility for unpinning
24 * (& possibly freeing) of memory after those ops have completed.
25 * Producer:
26 * begin
27 * push - send ops to the push buffer
28 * end - start command DMA and enqueue handles to be unpinned
29 * Consumer:
30 * update - call to update sync queue and push buffer, unpin memory
31 */
32
33 struct push_buffer {
34 void *mapped; /* mapped pushbuffer memory */
35 dma_addr_t dma; /* device address of pushbuffer */
36 dma_addr_t phys; /* physical address of pushbuffer */
37 u32 fence; /* index we've written */
38 u32 pos; /* index to write to */
39 u32 size;
40 u32 alloc_size;
41 };
42
43 struct buffer_timeout {
44 struct delayed_work wq; /* work queue */
45 bool initialized; /* timer one-time setup flag */
46 struct host1x_syncpt *syncpt; /* buffer completion syncpt */
47 u32 syncpt_val; /* syncpt value when completed */
48 ktime_t start_ktime; /* starting time */
49 /* context timeout information */
50 struct host1x_client *client;
51 };
52
53 enum cdma_event {
54 CDMA_EVENT_NONE, /* not waiting for any event */
55 CDMA_EVENT_SYNC_QUEUE_EMPTY, /* wait for empty sync queue */
56 CDMA_EVENT_PUSH_BUFFER_SPACE /* wait for space in push buffer */
57 };
58
59 struct host1x_cdma {
60 struct mutex lock; /* controls access to shared state */
61 struct completion complete; /* signalled when event occurs */
62 enum cdma_event event; /* event that complete is waiting for */
63 unsigned int slots_used; /* pb slots used in current submit */
64 unsigned int slots_free; /* pb slots free in current submit */
65 unsigned int first_get; /* DMAGET value, where submit begins */
66 unsigned int last_pos; /* last value written to DMAPUT */
67 struct push_buffer push_buffer; /* channel's push buffer */
68 struct list_head sync_queue; /* job queue */
69 struct buffer_timeout timeout; /* channel's timeout state/wq */
70 bool running;
71 bool torndown;
72 };
73
74 #define cdma_to_channel(cdma) container_of(cdma, struct host1x_channel, cdma)
75 #define cdma_to_host1x(cdma) dev_get_drvdata(cdma_to_channel(cdma)->dev->parent)
76 #define pb_to_cdma(pb) container_of(pb, struct host1x_cdma, push_buffer)
77
78 int host1x_cdma_init(struct host1x_cdma *cdma);
79 int host1x_cdma_deinit(struct host1x_cdma *cdma);
80 int host1x_cdma_begin(struct host1x_cdma *cdma, struct host1x_job *job);
81 void host1x_cdma_push(struct host1x_cdma *cdma, u32 op1, u32 op2);
82 void host1x_cdma_push_wide(struct host1x_cdma *cdma, u32 op1, u32 op2,
83 u32 op3, u32 op4);
84 void host1x_cdma_end(struct host1x_cdma *cdma, struct host1x_job *job);
85 void host1x_cdma_update(struct host1x_cdma *cdma);
86 void host1x_cdma_peek(struct host1x_cdma *cdma, u32 dmaget, int slot,
87 u32 *out);
88 unsigned int host1x_cdma_wait_locked(struct host1x_cdma *cdma,
89 enum cdma_event event);
90 void host1x_cdma_update_sync_queue(struct host1x_cdma *cdma,
91 struct device *dev);
92 #endif