diff options
Diffstat (limited to 'sys/dev/ioat/ioat.h')
-rw-r--r-- | sys/dev/ioat/ioat.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/sys/dev/ioat/ioat.h b/sys/dev/ioat/ioat.h new file mode 100644 index 0000000..dce4142 --- /dev/null +++ b/sys/dev/ioat/ioat.h @@ -0,0 +1,77 @@ +/*- + * Copyright (C) 2012 Intel Corporation + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +__FBSDID("$FreeBSD$"); + +#ifndef __IOAT_H__ +#define __IOAT_H__ + +#include <sys/param.h> +#include <machine/bus.h> + +/* + * This file defines the public interface to the IOAT driver. + */ + +/* + * Enables an interrupt for this operation. Typically, you would only enable + * this on the last operation in a group + */ +#define DMA_INT_EN 0x1 +#define DMA_ALL_FLAGS (DMA_INT_EN) + +typedef void *bus_dmaengine_t; +struct bus_dmadesc; +typedef void (*bus_dmaengine_callback_t)(void *arg); + +/* + * Called first to acquire a reference to the DMA channel + */ +bus_dmaengine_t ioat_get_dmaengine(uint32_t channel_index); + +/* + * Acquire must be called before issuing an operation to perform. Release is + * called after. Multiple operations can be issued within the context of one + * acquire and release + */ +void ioat_acquire(bus_dmaengine_t dmaengine); +void ioat_release(bus_dmaengine_t dmaengine); + +/* Issues the copy data operation */ +struct bus_dmadesc *ioat_copy(bus_dmaengine_t dmaengine, bus_addr_t dst, + bus_addr_t src, bus_size_t len, bus_dmaengine_callback_t callback_fn, + void *callback_arg, uint32_t flags); + +/* + * Issues a null operation. This issues the operation to the hardware, but the + * hardware doesn't do anything with it. + */ +struct bus_dmadesc *ioat_null(bus_dmaengine_t dmaengine, + bus_dmaengine_callback_t callback_fn, void *callback_arg, uint32_t flags); + + +#endif /* __IOAT_H__ */ + |