forked from Minki/linux
1f9c0a7727
This driver enables the Freescale DPAA 1.x Buffer Manager block. BMan is a hardware accelerator that manages buffer pools. It allows CPUs and other accelerators connected to the SoC datapath to acquire and release buffers during data processing. Signed-off-by: Roy Pledge <roy.pledge@nxp.com> Signed-off-by: Claudiu Manoil <claudiu.manoil@nxp.com> Signed-off-by: Scott Wood <oss@buserror.net>
130 lines
4.5 KiB
C
130 lines
4.5 KiB
C
/* Copyright 2008 - 2016 Freescale Semiconductor, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of Freescale Semiconductor nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* ALTERNATIVELY, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") as published by the Free Software
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* Foundation, either version 2 of that License or (at your option) any
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* later version.
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*
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* THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __FSL_BMAN_H
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#define __FSL_BMAN_H
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/* wrapper for 48-bit buffers */
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struct bm_buffer {
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union {
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struct {
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__be16 bpid; /* hi 8-bits reserved */
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__be16 hi; /* High 16-bits of 48-bit address */
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__be32 lo; /* Low 32-bits of 48-bit address */
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};
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__be64 data;
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};
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} __aligned(8);
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/*
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* Restore the 48 bit address previously stored in BMan
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* hardware pools as a dma_addr_t
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*/
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static inline dma_addr_t bm_buf_addr(const struct bm_buffer *buf)
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{
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return be64_to_cpu(buf->data) & 0xffffffffffffLLU;
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}
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static inline u64 bm_buffer_get64(const struct bm_buffer *buf)
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{
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return be64_to_cpu(buf->data) & 0xffffffffffffLLU;
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}
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static inline void bm_buffer_set64(struct bm_buffer *buf, u64 addr)
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{
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buf->hi = cpu_to_be16(upper_32_bits(addr));
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buf->lo = cpu_to_be32(lower_32_bits(addr));
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}
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static inline u8 bm_buffer_get_bpid(const struct bm_buffer *buf)
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{
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return be16_to_cpu(buf->bpid) & 0xff;
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}
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static inline void bm_buffer_set_bpid(struct bm_buffer *buf, int bpid)
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{
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buf->bpid = cpu_to_be16(bpid & 0xff);
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}
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/* Managed portal, high-level i/face */
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/* Portal and Buffer Pools */
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struct bman_portal;
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struct bman_pool;
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#define BM_POOL_MAX 64 /* max # of buffer pools */
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/**
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* bman_new_pool - Allocates a Buffer Pool object
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*
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* Creates a pool object, and returns a reference to it or NULL on error.
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*/
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struct bman_pool *bman_new_pool(void);
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/**
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* bman_free_pool - Deallocates a Buffer Pool object
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* @pool: the pool object to release
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*/
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void bman_free_pool(struct bman_pool *pool);
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/**
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* bman_get_bpid - Returns a pool object's BPID.
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* @pool: the pool object
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*
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* The returned value is the index of the encapsulated buffer pool,
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* in the range of [0, @BM_POOL_MAX-1].
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*/
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int bman_get_bpid(const struct bman_pool *pool);
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/**
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* bman_release - Release buffer(s) to the buffer pool
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* @pool: the buffer pool object to release to
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* @bufs: an array of buffers to release
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* @num: the number of buffers in @bufs (1-8)
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*
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* Adds the given buffers to RCR entries. If the RCR ring is unresponsive,
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* the function will return -ETIMEDOUT. Otherwise, it returns zero.
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*/
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int bman_release(struct bman_pool *pool, const struct bm_buffer *bufs, u8 num);
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/**
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* bman_acquire - Acquire buffer(s) from a buffer pool
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* @pool: the buffer pool object to acquire from
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* @bufs: array for storing the acquired buffers
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* @num: the number of buffers desired (@bufs is at least this big)
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*
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* Issues an "Acquire" command via the portal's management command interface.
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* The return value will be the number of buffers obtained from the pool, or a
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* negative error code if a h/w error or pool starvation was encountered. In
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* the latter case, the content of @bufs is undefined.
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*/
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int bman_acquire(struct bman_pool *pool, struct bm_buffer *bufs, u8 num);
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#endif /* __FSL_BMAN_H */
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