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authorClaudiu Manoil <claudiu.manoil@nxp.com>2016-09-22 18:04:08 +0300
committerScott Wood <oss@buserror.net>2016-09-25 10:38:58 +0300
commit1f9c0a77278bc9ec7df14bbd799fccfabff1010a (patch)
tree42b072113b1a91e58806d4f59230771213dde234 /include/soc/fsl/bman.h
parent36eb1542fc97c3164a08751b97dafdac0f9e1366 (diff)
downloadlinux-1f9c0a77278bc9ec7df14bbd799fccfabff1010a.tar.xz
soc/fsl: Introduce DPAA 1.x BMan device driver
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>
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diff --git a/include/soc/fsl/bman.h b/include/soc/fsl/bman.h
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+/* Copyright 2008 - 2016 Freescale Semiconductor, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * 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.
+ * * Neither the name of Freescale Semiconductor nor the
+ * names of its contributors may be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") as published by the Free Software
+ * Foundation, either version 2 of that License or (at your option) any
+ * later version.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``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 Freescale Semiconductor 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.
+ */
+
+#ifndef __FSL_BMAN_H
+#define __FSL_BMAN_H
+
+/* wrapper for 48-bit buffers */
+struct bm_buffer {
+ union {
+ struct {
+ __be16 bpid; /* hi 8-bits reserved */
+ __be16 hi; /* High 16-bits of 48-bit address */
+ __be32 lo; /* Low 32-bits of 48-bit address */
+ };
+ __be64 data;
+ };
+} __aligned(8);
+/*
+ * Restore the 48 bit address previously stored in BMan
+ * hardware pools as a dma_addr_t
+ */
+static inline dma_addr_t bm_buf_addr(const struct bm_buffer *buf)
+{
+ return be64_to_cpu(buf->data) & 0xffffffffffffLLU;
+}
+
+static inline u64 bm_buffer_get64(const struct bm_buffer *buf)
+{
+ return be64_to_cpu(buf->data) & 0xffffffffffffLLU;
+}
+
+static inline void bm_buffer_set64(struct bm_buffer *buf, u64 addr)
+{
+ buf->hi = cpu_to_be16(upper_32_bits(addr));
+ buf->lo = cpu_to_be32(lower_32_bits(addr));
+}
+
+static inline u8 bm_buffer_get_bpid(const struct bm_buffer *buf)
+{
+ return be16_to_cpu(buf->bpid) & 0xff;
+}
+
+static inline void bm_buffer_set_bpid(struct bm_buffer *buf, int bpid)
+{
+ buf->bpid = cpu_to_be16(bpid & 0xff);
+}
+
+/* Managed portal, high-level i/face */
+
+/* Portal and Buffer Pools */
+struct bman_portal;
+struct bman_pool;
+
+#define BM_POOL_MAX 64 /* max # of buffer pools */
+
+/**
+ * bman_new_pool - Allocates a Buffer Pool object
+ *
+ * Creates a pool object, and returns a reference to it or NULL on error.
+ */
+struct bman_pool *bman_new_pool(void);
+
+/**
+ * bman_free_pool - Deallocates a Buffer Pool object
+ * @pool: the pool object to release
+ */
+void bman_free_pool(struct bman_pool *pool);
+
+/**
+ * bman_get_bpid - Returns a pool object's BPID.
+ * @pool: the pool object
+ *
+ * The returned value is the index of the encapsulated buffer pool,
+ * in the range of [0, @BM_POOL_MAX-1].
+ */
+int bman_get_bpid(const struct bman_pool *pool);
+
+/**
+ * bman_release - Release buffer(s) to the buffer pool
+ * @pool: the buffer pool object to release to
+ * @bufs: an array of buffers to release
+ * @num: the number of buffers in @bufs (1-8)
+ *
+ * Adds the given buffers to RCR entries. If the RCR ring is unresponsive,
+ * the function will return -ETIMEDOUT. Otherwise, it returns zero.
+ */
+int bman_release(struct bman_pool *pool, const struct bm_buffer *bufs, u8 num);
+
+/**
+ * bman_acquire - Acquire buffer(s) from a buffer pool
+ * @pool: the buffer pool object to acquire from
+ * @bufs: array for storing the acquired buffers
+ * @num: the number of buffers desired (@bufs is at least this big)
+ *
+ * Issues an "Acquire" command via the portal's management command interface.
+ * The return value will be the number of buffers obtained from the pool, or a
+ * negative error code if a h/w error or pool starvation was encountered. In
+ * the latter case, the content of @bufs is undefined.
+ */
+int bman_acquire(struct bman_pool *pool, struct bm_buffer *bufs, u8 num);
+
+#endif /* __FSL_BMAN_H */