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 93