[PATCH v4 2/8] bus: fsl-mc: dpio: add APIs for DPIO objects

[Stuart Yoder]

From: Ioana Radulescu <ruxandra.radulescu@xxxxxxx>

Add the command build/parse APIs for operating on DPIO objects through
the DPAA2 Management Complex.

Signed-off-by: Ioana Radulescu <ruxandra.radulescu@xxxxxxx>
Signed-off-by: Roy Pledge <roy.pledge@xxxxxxx>
Signed-off-by: Stuart Yoder <stuart.yoder@xxxxxxx>
---

Notes:
    -v4
      -adjust file location to be in drivers/staging
      -remove unneeded comments
      -updated copyright
    -v3
      -no changes
    -v2
      -removed unused structs and defines

 drivers/staging/fsl-mc/bus/Kconfig         |  10 ++
 drivers/staging/fsl-mc/bus/Makefile        |   3 +
 drivers/staging/fsl-mc/bus/dpio/Makefile   |   9 ++
 drivers/staging/fsl-mc/bus/dpio/dpio-cmd.h |  76 ++++++++++
 drivers/staging/fsl-mc/bus/dpio/dpio.c     | 224 +++++++++++++++++++++++++++++
 drivers/staging/fsl-mc/bus/dpio/dpio.h     | 109 ++++++++++++++
 6 files changed, 431 insertions(+)
 create mode 100644 drivers/staging/fsl-mc/bus/dpio/Makefile
 create mode 100644 drivers/staging/fsl-mc/bus/dpio/dpio-cmd.h
 create mode 100644 drivers/staging/fsl-mc/bus/dpio/dpio.c
 create mode 100644 drivers/staging/fsl-mc/bus/dpio/dpio.h

diff --git a/drivers/staging/fsl-mc/bus/Kconfig b/drivers/staging/fsl-mc/bus/Kconfig
index 5c009ab..a10aaf0 100644
--- a/drivers/staging/fsl-mc/bus/Kconfig
+++ b/drivers/staging/fsl-mc/bus/Kconfig
@@ -15,3 +15,13 @@ config FSL_MC_BUS
 	  architecture.  The fsl-mc bus driver handles discovery of
 	  DPAA2 objects (which are represented as Linux devices) and
 	  binding objects to drivers.
+
+config FSL_MC_DPIO
+        tristate "QorIQ DPAA2 DPIO driver"
+        depends on FSL_MC_BUS
+        help
+	  Driver for the DPAA2 DPIO object.  A DPIO provides queue and
+	  buffer management facilities for software to interact with
+	  other DPAA2 objects. This driver does not expose the DPIO
+	  objects individually, but groups them under a service layer
+	  API.
diff --git a/drivers/staging/fsl-mc/bus/Makefile b/drivers/staging/fsl-mc/bus/Makefile
index 38716fd..577e9fa 100644
--- a/drivers/staging/fsl-mc/bus/Makefile
+++ b/drivers/staging/fsl-mc/bus/Makefile
@@ -18,3 +18,6 @@ mc-bus-driver-objs := fsl-mc-bus.o \
 		      irq-gic-v3-its-fsl-mc-msi.o \
 		      dpmcp.o \
 		      dpbp.o
+
+# MC DPIO driver
+obj-$(CONFIG_FSL_MC_DPIO) += dpio/
diff --git a/drivers/staging/fsl-mc/bus/dpio/Makefile b/drivers/staging/fsl-mc/bus/dpio/Makefile
new file mode 100644
index 0000000..128befc
--- /dev/null
+++ b/drivers/staging/fsl-mc/bus/dpio/Makefile
@@ -0,0 +1,9 @@
+#
+# QorIQ DPAA2 DPIO driver
+#
+
+subdir-ccflags-y := -Werror
+
+obj-$(CONFIG_FSL_MC_DPIO) += fsl-mc-dpio.o
+
+fsl-mc-dpio-objs := dpio.o
diff --git a/drivers/staging/fsl-mc/bus/dpio/dpio-cmd.h b/drivers/staging/fsl-mc/bus/dpio/dpio-cmd.h
new file mode 100644
index 0000000..c237d5f
--- /dev/null
+++ b/drivers/staging/fsl-mc/bus/dpio/dpio-cmd.h
@@ -0,0 +1,76 @@
+/*
+ * Copyright 2013-2016 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 the above-listed copyright holders nor the
+ * names of any 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 THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDERS 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.
+ */
+#ifndef _FSL_DPIO_CMD_H
+#define _FSL_DPIO_CMD_H
+
+/* DPIO Version */
+#define DPIO_VER_MAJOR			4
+#define DPIO_VER_MINOR			2
+
+/* Command Versioning */
+
+#define DPIO_CMD_ID_OFFSET		4
+#define DPIO_CMD_BASE_VERSION		1
+
+#define DPIO_CMD(id)	((id << DPIO_CMD_ID_OFFSET) | DPIO_CMD_BASE_VERSION)
+
+/* Command IDs */
+#define DPIO_CMDID_CLOSE				DPIO_CMD(0x800)
+#define DPIO_CMDID_OPEN					DPIO_CMD(0x803)
+#define DPIO_CMDID_GET_API_VERSION			DPIO_CMD(0xa03)
+#define DPIO_CMDID_ENABLE				DPIO_CMD(0x002)
+#define DPIO_CMDID_DISABLE				DPIO_CMD(0x003)
+#define DPIO_CMDID_GET_ATTR				DPIO_CMD(0x004)
+
+struct dpio_cmd_open {
+	__le32 dpio_id;
+};
+
+#define DPIO_CHANNEL_MODE_MASK		0x3
+
+struct dpio_rsp_get_attr {
+	/* cmd word 0 */
+	__le32 id;
+	__le16 qbman_portal_id;
+	u8 num_priorities;
+	u8 channel_mode;
+	/* cmd word 1 */
+	__le64 qbman_portal_ce_addr;
+	/* cmd word 2 */
+	__le64 qbman_portal_ci_addr;
+	/* cmd word 3 */
+	__le32 pad;
+	__le32 qbman_version;
+};
+
+#endif /* _FSL_DPIO_CMD_H */
diff --git a/drivers/staging/fsl-mc/bus/dpio/dpio.c b/drivers/staging/fsl-mc/bus/dpio/dpio.c
new file mode 100644
index 0000000..d81e023
--- /dev/null
+++ b/drivers/staging/fsl-mc/bus/dpio/dpio.c
@@ -0,0 +1,224 @@
+/*
+ * Copyright 2013-2016 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 the above-listed copyright holders nor the
+ * names of any 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 THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDERS 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.
+ */
+#include "../../include/mc-sys.h"
+#include "../../include/mc-cmd.h"
+
+#include "dpio.h"
+#include "dpio-cmd.h"
+
+/*
+ * Data Path I/O Portal API
+ * Contains initialization APIs and runtime control APIs for DPIO
+ */
+
+/**
+ * dpio_open() - Open a control session for the specified object
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @dpio_id:	DPIO unique ID
+ * @token:	Returned token; use in subsequent API calls
+ *
+ * This function can be used to open a control session for an
+ * already created object; an object may have been declared in
+ * the DPL or by calling the dpio_create() function.
+ * This function returns a unique authentication token,
+ * associated with the specific object ID and the specific MC
+ * portal; this token must be used in all subsequent commands for
+ * this specific object.
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dpio_open(struct fsl_mc_io *mc_io,
+	      u32 cmd_flags,
+	      int dpio_id,
+	      u16 *token)
+{
+	struct mc_command cmd = { 0 };
+	struct dpio_cmd_open *dpio_cmd;
+	int err;
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPIO_CMDID_OPEN,
+					  cmd_flags,
+					  0);
+	dpio_cmd = (struct dpio_cmd_open *)cmd.params;
+	dpio_cmd->dpio_id = cpu_to_le32(dpio_id);
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	/* retrieve response parameters */
+	*token = mc_cmd_hdr_read_token(&cmd);
+
+	return 0;
+}
+
+/**
+ * dpio_close() - Close the control session of the object
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPIO object
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dpio_close(struct fsl_mc_io *mc_io,
+	       u32 cmd_flags,
+	       u16 token)
+{
+	struct mc_command cmd = { 0 };
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPIO_CMDID_CLOSE,
+					  cmd_flags,
+					  token);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dpio_enable() - Enable the DPIO, allow I/O portal operations.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPIO object
+ *
+ * Return:	'0' on Success; Error code otherwise
+ */
+int dpio_enable(struct fsl_mc_io *mc_io,
+		u32 cmd_flags,
+		u16 token)
+{
+	struct mc_command cmd = { 0 };
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPIO_CMDID_ENABLE,
+					  cmd_flags,
+					  token);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dpio_disable() - Disable the DPIO, stop any I/O portal operation.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPIO object
+ *
+ * Return:	'0' on Success; Error code otherwise
+ */
+int dpio_disable(struct fsl_mc_io *mc_io,
+		 u32 cmd_flags,
+		 u16 token)
+{
+	struct mc_command cmd = { 0 };
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPIO_CMDID_DISABLE,
+					  cmd_flags,
+					  token);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dpio_get_attributes() - Retrieve DPIO attributes
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPIO object
+ * @attr:	Returned object's attributes
+ *
+ * Return:	'0' on Success; Error code otherwise
+ */
+int dpio_get_attributes(struct fsl_mc_io *mc_io,
+			u32 cmd_flags,
+			u16 token,
+			struct dpio_attr *attr)
+{
+	struct mc_command cmd = { 0 };
+	struct dpio_rsp_get_attr *dpio_rsp;
+	int err;
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPIO_CMDID_GET_ATTR,
+					  cmd_flags,
+					  token);
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	/* retrieve response parameters */
+	dpio_rsp = (struct dpio_rsp_get_attr *)cmd.params;
+	attr->id = le32_to_cpu(dpio_rsp->id);
+	attr->qbman_portal_id = le16_to_cpu(dpio_rsp->qbman_portal_id);
+	attr->num_priorities = dpio_rsp->num_priorities;
+	attr->channel_mode = dpio_rsp->channel_mode & DPIO_CHANNEL_MODE_MASK;
+	attr->qbman_portal_ce_offset =
+		le64_to_cpu(dpio_rsp->qbman_portal_ce_addr);
+	attr->qbman_portal_ci_offset =
+		le64_to_cpu(dpio_rsp->qbman_portal_ci_addr);
+	attr->qbman_version = le32_to_cpu(dpio_rsp->qbman_version);
+
+	return 0;
+}
+
+/**
+ * dpio_get_api_version - Get Data Path I/O API version
+ * @mc_io:	Pointer to MC portal's DPIO object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @major_ver:	Major version of DPIO API
+ * @minor_ver:	Minor version of DPIO API
+ *
+ * Return:	'0' on Success; Error code otherwise
+ */
+int dpio_get_api_version(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 *major_ver,
+			 u16 *minor_ver)
+{
+	struct mc_command cmd = { 0 };
+	int err;
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPIO_CMDID_GET_API_VERSION,
+					  cmd_flags, 0);
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	/* retrieve response parameters */
+	mc_cmd_read_api_version(&cmd, major_ver, minor_ver);
+
+	return 0;
+}
diff --git a/drivers/staging/fsl-mc/bus/dpio/dpio.h b/drivers/staging/fsl-mc/bus/dpio/dpio.h
new file mode 100644
index 0000000..ced1103
--- /dev/null
+++ b/drivers/staging/fsl-mc/bus/dpio/dpio.h
@@ -0,0 +1,109 @@
+/*
+ * Copyright 2013-2016 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 the above-listed copyright holders nor the
+ * names of any 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 THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDERS 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.
+ */
+#ifndef __FSL_DPIO_H
+#define __FSL_DPIO_H
+
+struct fsl_mc_io;
+
+int dpio_open(struct fsl_mc_io	*mc_io,
+	      u32		cmd_flags,
+	      int		dpio_id,
+	      u16		*token);
+
+int dpio_close(struct fsl_mc_io	*mc_io,
+	       u32		cmd_flags,
+	       u16		token);
+
+/**
+ * enum dpio_channel_mode - DPIO notification channel mode
+ * @DPIO_NO_CHANNEL: No support for notification channel
+ * @DPIO_LOCAL_CHANNEL: Notifications on data availability can be received by a
+ *	dedicated channel in the DPIO; user should point the queue's
+ *	destination in the relevant interface to this DPIO
+ */
+enum dpio_channel_mode {
+	DPIO_NO_CHANNEL = 0,
+	DPIO_LOCAL_CHANNEL = 1,
+};
+
+/**
+ * struct dpio_cfg - Structure representing DPIO configuration
+ * @channel_mode: Notification channel mode
+ * @num_priorities: Number of priorities for the notification channel (1-8);
+ *			relevant only if 'channel_mode = DPIO_LOCAL_CHANNEL'
+ */
+struct dpio_cfg {
+	enum dpio_channel_mode	channel_mode;
+	u8		num_priorities;
+};
+
+int dpio_enable(struct fsl_mc_io	*mc_io,
+		u32		cmd_flags,
+		u16		token);
+
+int dpio_disable(struct fsl_mc_io	*mc_io,
+		 u32		cmd_flags,
+		 u16		token);
+
+/**
+ * struct dpio_attr - Structure representing DPIO attributes
+ * @id: DPIO object ID
+ * @qbman_portal_ce_offset: offset of the software portal cache-enabled area
+ * @qbman_portal_ci_offset: offset of the software portal cache-inhibited area
+ * @qbman_portal_id: Software portal ID
+ * @channel_mode: Notification channel mode
+ * @num_priorities: Number of priorities for the notification channel (1-8);
+ *			relevant only if 'channel_mode = DPIO_LOCAL_CHANNEL'
+ * @qbman_version: QBMAN version
+ */
+struct dpio_attr {
+	int			id;
+	u64		qbman_portal_ce_offset;
+	u64		qbman_portal_ci_offset;
+	u16		qbman_portal_id;
+	enum dpio_channel_mode	channel_mode;
+	u8			num_priorities;
+	u32		qbman_version;
+};
+
+int dpio_get_attributes(struct fsl_mc_io	*mc_io,
+			u32		cmd_flags,
+			u16		token,
+			struct dpio_attr	*attr);
+
+int dpio_get_api_version(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 *major_ver,
+			 u16 *minor_ver);
+
+#endif /* __FSL_DPIO_H */
-- 
1.9.0