[PATCH v4 3/8] bus: fsl-mc: dpio: add frame descriptor and scatter/gather APIs

[Stuart Yoder <stuart.yoder@nxp.com>]

From: Roy Pledge <Roy.Pledge@nxp.com>

Add global definitions for DPAA2 frame descriptors and scatter
gather entries.

Signed-off-by: Roy Pledge <Roy.Pledge@nxp.com>
Signed-off-by: Stuart Yoder <stuart.yoder@nxp.com>
---

Notes:
    -v4
       -updated copyright
       -adjust file location to be in drivers/staging
       -address cleanup comments-- whitespace cleanup, use !! consistently
        to convert expression to bool, remove unneeded parenthesis
    -v3
       -no changes
    -v2
       -added setter/getter for the FD ctrl field
       -corrected comment for SG format_offset field description
       -added support for short length field in FD

 drivers/staging/fsl-mc/include/dpaa2-fd.h | 448 ++++++++++++++++++++++++++++++
 1 file changed, 448 insertions(+)
 create mode 100644 drivers/staging/fsl-mc/include/dpaa2-fd.h

diff --git a/drivers/staging/fsl-mc/include/dpaa2-fd.h b/drivers/staging/fsl-mc/include/dpaa2-fd.h
new file mode 100644
index 0000000..21102e6
--- /dev/null
+++ b/drivers/staging/fsl-mc/include/dpaa2-fd.h
@@ -0,0 +1,448 @@
+/*
+ * Copyright 2014-2016 Freescale Semiconductor Inc.
+ * Copyright 2016 NXP
+ *
+ * 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_DPAA2_FD_H
+#define __FSL_DPAA2_FD_H
+
+#include <linux/kernel.h>
+
+/**
+ * DOC: DPAA2 FD - Frame Descriptor APIs for DPAA2
+ *
+ * Frame Descriptors (FDs) are used to describe frame data in the DPAA2.
+ * Frames can be enqueued and dequeued to Frame Queues (FQs) which are consumed
+ * by the various DPAA accelerators (WRIOP, SEC, PME, DCE)
+ *
+ * There are three types of frames: single, scatter gather, and frame lists.
+ *
+ * The set of APIs in this file must be used to create, manipulate and
+ * query Frame Descriptors.
+ */
+
+/**
+ * struct dpaa2_fd - Struct describing FDs
+ * @words:         for easier/faster copying the whole FD structure
+ * @addr:          address in the FD
+ * @len:           length in the FD
+ * @bpid:          buffer pool ID
+ * @format_offset: format, offset, and short-length fields
+ * @frc:           frame context
+ * @ctrl:          control bits...including dd, sc, va, err, etc
+ * @flc:           flow context address
+ *
+ * This structure represents the basic Frame Descriptor used in the system.
+ */
+struct dpaa2_fd {
+	union {
+		u32 words[8];
+		struct dpaa2_fd_simple {
+			__le64 addr;
+			__le32 len;
+			__le16 bpid;
+			__le16 format_offset;
+			__le32 frc;
+			__le32 ctrl;
+			__le64 flc;
+		} simple;
+	};
+};
+
+#define FD_SHORT_LEN_FLAG_MASK	0x1
+#define FD_SHORT_LEN_FLAG_SHIFT	14
+#define FD_SHORT_LEN_MASK	0x1FFFF
+#define FD_OFFSET_MASK		0x0FFF
+#define FD_FORMAT_MASK		0x3
+#define FD_FORMAT_SHIFT		12
+#define SG_SHORT_LEN_FLAG_MASK	0x1
+#define SG_SHORT_LEN_FLAG_SHIFT	14
+#define SG_SHORT_LEN_MASK	0x1FFFF
+#define SG_OFFSET_MASK		0x0FFF
+#define SG_FORMAT_MASK		0x3
+#define SG_FORMAT_SHIFT		12
+#define SG_BPID_MASK		0x3FFF
+#define SG_FINAL_FLAG_MASK	0x1
+#define SG_FINAL_FLAG_SHIFT	15
+
+enum dpaa2_fd_format {
+	dpaa2_fd_single = 0,
+	dpaa2_fd_list,
+	dpaa2_fd_sg
+};
+
+/**
+ * dpaa2_fd_get_addr() - get the addr field of frame descriptor
+ * @fd: the given frame descriptor
+ *
+ * Return the address in the frame descriptor.
+ */
+static inline dma_addr_t dpaa2_fd_get_addr(const struct dpaa2_fd *fd)
+{
+	return (dma_addr_t)fd->simple.addr;
+}
+
+/**
+ * dpaa2_fd_set_addr() - Set the addr field of frame descriptor
+ * @fd: the given frame descriptor
+ * @addr: the address needs to be set in frame descriptor
+ */
+static inline void dpaa2_fd_set_addr(struct dpaa2_fd *fd, dma_addr_t addr)
+{
+	fd->simple.addr = addr;
+}
+
+/**
+ * dpaa2_fd_get_frc() - Get the frame context in the frame descriptor
+ * @fd: the given frame descriptor
+ *
+ * Return the frame context field in the frame descriptor.
+ */
+static inline u32 dpaa2_fd_get_frc(const struct dpaa2_fd *fd)
+{
+	return fd->simple.frc;
+}
+
+/**
+ * dpaa2_fd_set_frc() - Set the frame context in the frame descriptor
+ * @fd: the given frame descriptor
+ * @frc: the frame context needs to be set in frame descriptor
+ */
+static inline void dpaa2_fd_set_frc(struct dpaa2_fd *fd, u32 frc)
+{
+	fd->simple.frc = frc;
+}
+
+/**
+ * dpaa2_fd_get_ctrl() - Get the control bits in the frame descriptor
+ * @fd: the given frame descriptor
+ *
+ * Return the control bits field in the frame descriptor.
+ */
+static inline u32 dpaa2_fd_get_ctrl(const struct dpaa2_fd *fd)
+{
+	return fd->simple.ctrl;
+}
+
+/**
+ * dpaa2_fd_set_ctrl() - Set the control bits in the frame descriptor
+ * @fd: the given frame descriptor
+ * @ctrl: the control bits to be set in the frame descriptor
+ */
+static inline void dpaa2_fd_set_ctrl(struct dpaa2_fd *fd, u32 ctrl)
+{
+	fd->simple.ctrl = ctrl;
+}
+
+/**
+ * dpaa2_fd_get_flc() - Get the flow context in the frame descriptor
+ * @fd: the given frame descriptor
+ *
+ * Return the flow context in the frame descriptor.
+ */
+static inline dma_addr_t dpaa2_fd_get_flc(const struct dpaa2_fd *fd)
+{
+	return (dma_addr_t)fd->simple.flc;
+}
+
+/**
+ * dpaa2_fd_set_flc() - Set the flow context field of frame descriptor
+ * @fd: the given frame descriptor
+ * @flc_addr: the flow context needs to be set in frame descriptor
+ */
+static inline void dpaa2_fd_set_flc(struct dpaa2_fd *fd,  dma_addr_t flc_addr)
+{
+	fd->simple.flc = flc_addr;
+}
+
+static inline bool dpaa2_fd_short_len(const struct dpaa2_fd *fd)
+{
+	return !!((fd->simple.format_offset >> FD_SHORT_LEN_FLAG_SHIFT)
+		& FD_SHORT_LEN_FLAG_MASK);
+}
+
+/**
+ * dpaa2_fd_get_len() - Get the length in the frame descriptor
+ * @fd: the given frame descriptor
+ *
+ * Return the length field in the frame descriptor.
+ */
+static inline u32 dpaa2_fd_get_len(const struct dpaa2_fd *fd)
+{
+	if (dpaa2_fd_short_len(fd))
+		return fd->simple.len & FD_SHORT_LEN_MASK;
+
+	return fd->simple.len;
+}
+
+/**
+ * dpaa2_fd_set_len() - Set the length field of frame descriptor
+ * @fd: the given frame descriptor
+ * @len: the length needs to be set in frame descriptor
+ */
+static inline void dpaa2_fd_set_len(struct dpaa2_fd *fd, u32 len)
+{
+	fd->simple.len = len;
+}
+
+/**
+ * dpaa2_fd_get_offset() - Get the offset field in the frame descriptor
+ * @fd: the given frame descriptor
+ *
+ * Return the offset.
+ */
+static inline uint16_t dpaa2_fd_get_offset(const struct dpaa2_fd *fd)
+{
+	return fd->simple.format_offset & FD_OFFSET_MASK;
+}
+
+/**
+ * dpaa2_fd_set_offset() - Set the offset field of frame descriptor
+ * @fd: the given frame descriptor
+ * @offset: the offset needs to be set in frame descriptor
+ */
+static inline void dpaa2_fd_set_offset(struct dpaa2_fd *fd, uint16_t offset)
+{
+	fd->simple.format_offset &= ~FD_OFFSET_MASK;
+	fd->simple.format_offset |= offset;
+}
+
+/**
+ * dpaa2_fd_get_format() - Get the format field in the frame descriptor
+ * @fd: the given frame descriptor
+ *
+ * Return the format.
+ */
+static inline enum dpaa2_fd_format dpaa2_fd_get_format(
+						const struct dpaa2_fd *fd)
+{
+	return (enum dpaa2_fd_format)((fd->simple.format_offset
+				      >> FD_FORMAT_SHIFT) & FD_FORMAT_MASK);
+}
+
+/**
+ * dpaa2_fd_set_format() - Set the format field of frame descriptor
+ * @fd: the given frame descriptor
+ * @format: the format needs to be set in frame descriptor
+ */
+static inline void dpaa2_fd_set_format(struct dpaa2_fd *fd,
+				       enum dpaa2_fd_format format)
+{
+	fd->simple.format_offset &= ~(FD_FORMAT_MASK << FD_FORMAT_SHIFT);
+	fd->simple.format_offset |= format << FD_FORMAT_SHIFT;
+}
+
+/**
+ * dpaa2_fd_get_bpid() - Get the bpid field in the frame descriptor
+ * @fd: the given frame descriptor
+ *
+ * Return the buffer pool id.
+ */
+static inline uint16_t dpaa2_fd_get_bpid(const struct dpaa2_fd *fd)
+{
+	return fd->simple.bpid;
+}
+
+/**
+ * dpaa2_fd_set_bpid() - Set the bpid field of frame descriptor
+ * @fd: the given frame descriptor
+ * @bpid: buffer pool id to be set
+ */
+static inline void dpaa2_fd_set_bpid(struct dpaa2_fd *fd, uint16_t bpid)
+{
+	fd->simple.bpid = bpid;
+}
+
+/**
+ * struct dpaa2_sg_entry - the scatter-gathering structure
+ * @addr: address of the sg entry
+ * @len: length in this sg entry
+ * @bpid: buffer pool id
+ * @format_offset: format and offset fields
+ */
+struct dpaa2_sg_entry {
+	__le64 addr;
+	__le32 len;
+	__le16 bpid;
+	__le16 format_offset;
+};
+
+enum dpaa2_sg_format {
+	dpaa2_sg_single = 0,
+	dpaa2_sg_frame_data,
+	dpaa2_sg_sgt_ext
+};
+
+/* Accessors for SG entry fields */
+
+/**
+ * dpaa2_sg_get_addr() - Get the address from SG entry
+ * @sg: the given scatter-gathering object
+ *
+ * Return the address.
+ */
+static inline dma_addr_t dpaa2_sg_get_addr(const struct dpaa2_sg_entry *sg)
+{
+	return le64_to_cpu((dma_addr_t)sg->addr);
+}
+
+/**
+ * dpaa2_sg_set_addr() - Set the address in SG entry
+ * @sg: the given scatter-gathering object
+ * @addr: the address to be set
+ */
+static inline void dpaa2_sg_set_addr(struct dpaa2_sg_entry *sg, dma_addr_t addr)
+{
+	sg->addr = cpu_to_le64(addr);
+}
+
+static inline bool dpaa2_sg_short_len(const struct dpaa2_sg_entry *sg)
+{
+	return !!((le16_to_cpu(sg->format_offset) >> SG_SHORT_LEN_FLAG_SHIFT)
+		& SG_SHORT_LEN_FLAG_MASK);
+}
+
+/**
+ * dpaa2_sg_get_len() - Get the length in SG entry
+ * @sg: the given scatter-gathering object
+ *
+ * Return the length.
+ */
+static inline u32 dpaa2_sg_get_len(const struct dpaa2_sg_entry *sg)
+{
+	if (dpaa2_sg_short_len(sg))
+		return le32_to_cpu(sg->len) & SG_SHORT_LEN_MASK;
+
+	return le32_to_cpu(sg->len);
+}
+
+/**
+ * dpaa2_sg_set_len() - Set the length in SG entry
+ * @sg: the given scatter-gathering object
+ * @len: the length to be set
+ */
+static inline void dpaa2_sg_set_len(struct dpaa2_sg_entry *sg, u32 len)
+{
+	sg->len = cpu_to_le32(len);
+}
+
+/**
+ * dpaa2_sg_get_offset() - Get the offset in SG entry
+ * @sg: the given scatter-gathering object
+ *
+ * Return the offset.
+ */
+static inline u16 dpaa2_sg_get_offset(const struct dpaa2_sg_entry *sg)
+{
+	return le16_to_cpu(sg->format_offset) & SG_OFFSET_MASK;
+}
+
+/**
+ * dpaa2_sg_set_offset() - Set the offset in SG entry
+ * @sg: the given scatter-gathering object
+ * @offset: the offset to be set
+ */
+static inline void dpaa2_sg_set_offset(struct dpaa2_sg_entry *sg,
+				       u16 offset)
+{
+	sg->format_offset &= cpu_to_le16(~SG_OFFSET_MASK);
+	sg->format_offset |= cpu_to_le16(offset);
+}
+
+/**
+ * dpaa2_sg_get_format() - Get the SG format in SG entry
+ * @sg: the given scatter-gathering object
+ *
+ * Return the format.
+ */
+static inline enum dpaa2_sg_format
+	dpaa2_sg_get_format(const struct dpaa2_sg_entry *sg)
+{
+	return (enum dpaa2_sg_format)((le16_to_cpu(sg->format_offset)
+				       >> SG_FORMAT_SHIFT) & SG_FORMAT_MASK);
+}
+
+/**
+ * dpaa2_sg_set_format() - Set the SG format in SG entry
+ * @sg: the given scatter-gathering object
+ * @format: the format to be set
+ */
+static inline void dpaa2_sg_set_format(struct dpaa2_sg_entry *sg,
+				       enum dpaa2_sg_format format)
+{
+	sg->format_offset &= cpu_to_le16(~(SG_FORMAT_MASK << SG_FORMAT_SHIFT));
+	sg->format_offset |= cpu_to_le16(format << SG_FORMAT_SHIFT);
+}
+
+/**
+ * dpaa2_sg_get_bpid() - Get the buffer pool id in SG entry
+ * @sg: the given scatter-gathering object
+ *
+ * Return the bpid.
+ */
+static inline u16 dpaa2_sg_get_bpid(const struct dpaa2_sg_entry *sg)
+{
+	return le16_to_cpu(sg->bpid) & SG_BPID_MASK;
+}
+
+/**
+ * dpaa2_sg_set_bpid() - Set the buffer pool id in SG entry
+ * @sg: the given scatter-gathering object
+ * @bpid: the bpid to be set
+ */
+static inline void dpaa2_sg_set_bpid(struct dpaa2_sg_entry *sg, u16 bpid)
+{
+	sg->bpid &= cpu_to_le16(~(SG_BPID_MASK));
+	sg->bpid |= cpu_to_le16(bpid);
+}
+
+/**
+ * dpaa2_sg_is_final() - Check final bit in SG entry
+ * @sg: the given scatter-gathering object
+ *
+ * Return bool.
+ */
+static inline bool dpaa2_sg_is_final(const struct dpaa2_sg_entry *sg)
+{
+	return !!(le16_to_cpu(sg->format_offset) >> SG_FINAL_FLAG_SHIFT);
+}
+
+/**
+ * dpaa2_sg_set_final() - Set the final bit in SG entry
+ * @sg: the given scatter-gathering object
+ * @final: the final boolean to be set
+ */
+static inline void dpaa2_sg_set_final(struct dpaa2_sg_entry *sg, bool final)
+{
+	sg->format_offset &= cpu_to_le16(~(SG_FINAL_FLAG_MASK
+					 << SG_FINAL_FLAG_SHIFT));
+	sg->format_offset |= cpu_to_le16(final << SG_FINAL_FLAG_SHIFT);
+}
+
+#endif /* __FSL_DPAA2_FD_H */
-- 
1.9.0