diff options
Diffstat (limited to 'drivers/gpu/host1x/cdma.h')
| -rw-r--r-- | drivers/gpu/host1x/cdma.h | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/drivers/gpu/host1x/cdma.h b/drivers/gpu/host1x/cdma.h new file mode 100644 index 000000000000..313c4b784348 --- /dev/null +++ b/drivers/gpu/host1x/cdma.h @@ -0,0 +1,100 @@ +/* + * Tegra host1x Command DMA + * + * Copyright (c) 2010-2013, 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 __HOST1X_CDMA_H +#define __HOST1X_CDMA_H + +#include <linux/sched.h> +#include <linux/semaphore.h> +#include <linux/list.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 { + u32 *mapped; /* mapped pushbuffer memory */ + dma_addr_t phys; /* physical address of pushbuffer */ + u32 fence; /* index we've written */ + u32 pos; /* index to write to */ + u32 size_bytes; +}; + +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 */ + int 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 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_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; +}; + +#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); +void host1x_cdma_stop(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_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 |