Subject: [v5 01/12] soc/fsl/qbman: Add common routine for QBMan private allocations

From: Roy Pledge <[email-masked]>
Date: Mon, 18 Sep 2017 16:39:36 -0400

The QBMan device uses several memory regions to manage frame
queues and buffers. Add a common routine for extracting and
initializing these reserved memory areas.

Signed-off-by: Roy Pledge <[email-masked]>
---
 drivers/soc/fsl/qbman/Makefile   |  2 +-
 drivers/soc/fsl/qbman/dpaa_sys.c | 78 ++++++++++++++++++++++++++++++++++++++++
 drivers/soc/fsl/qbman/dpaa_sys.h |  4 +++
 3 files changed, 83 insertions(+), 1 deletion(-)
 create mode 100644 drivers/soc/fsl/qbman/dpaa_sys.c

diff --git a/drivers/soc/fsl/qbman/Makefile b/drivers/soc/fsl/qbman/Makefile
index 7ae199f..3cbd08a 100644
--- a/drivers/soc/fsl/qbman/Makefile
+++ b/drivers/soc/fsl/qbman/Makefile
@@ -1,6 +1,6 @@
 obj-$(CONFIG_FSL_DPAA)                          += bman_ccsr.o qman_ccsr.o \
 						   bman_portal.o qman_portal.o \
-						   bman.o qman.o
+						   bman.o qman.o dpaa_sys.o
 
 obj-$(CONFIG_FSL_BMAN_TEST)                     += bman-test.o
 bman-test-y                                      = bman_test.o
diff --git a/drivers/soc/fsl/qbman/dpaa_sys.c b/drivers/soc/fsl/qbman/dpaa_sys.c
new file mode 100644
index 0000000..9436aa8
--- /dev/null
+++ b/drivers/soc/fsl/qbman/dpaa_sys.c
@@ -0,0 +1,78 @@
+/* Copyright 2017 NXP 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 NXP 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 NXP 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 NXP 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.
+ */
+
+#include <linux/dma-mapping.h>
+#include "dpaa_sys.h"
+
+/*
+ * Initialize a devices private memory region
+ */
+int qbman_init_private_mem(struct device *dev, int idx, dma_addr_t *addr,
+				size_t *size)
+{
+	int ret;
+	struct device_node *mem_node;
+	u64 size64;
+
+	ret = of_reserved_mem_device_init_by_idx(dev, dev->of_node, idx);
+	if (ret) {
+		dev_err(dev,
+			"of_reserved_mem_device_init_by_idx(%d) failed 0x%x\n",
+			idx, ret);
+		return -ENODEV;
+	}
+	mem_node = of_parse_phandle(dev->of_node, "memory-region", 0);
+	if (mem_node) {
+		ret = of_property_read_u64(mem_node, "size", &size64);
+		if (ret) {
+			dev_err(dev, "of_address_to_resource fails 0x%x\n",
+			        ret);
+			return -ENODEV;
+		}
+		*size = size64;
+	} else {
+		dev_err(dev, "No memory-region found for index %d\n", idx);
+		return -ENODEV;
+	}
+
+	if (!dma_zalloc_coherent(dev, *size, addr, 0)) {
+		dev_err(dev, "DMA Alloc memory failed\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * Disassociate the reserved memory area from the device
+	 * because a device can only have one DMA memory area. This
+	 * should be fine since the memory is allocated and initialized
+	 * and only ever accessed by the QBMan device from now on
+	 */
+	of_reserved_mem_device_release(dev);
+	return 0;
+}
diff --git a/drivers/soc/fsl/qbman/dpaa_sys.h b/drivers/soc/fsl/qbman/dpaa_sys.h
index 2ce394a..676af82 100644
--- a/drivers/soc/fsl/qbman/dpaa_sys.h
+++ b/drivers/soc/fsl/qbman/dpaa_sys.h
@@ -102,4 +102,8 @@ static inline u8 dpaa_cyc_diff(u8 ringsize, u8 first, u8 last)
 /* Offset applied to genalloc pools due to zero being an error return */
 #define DPAA_GENALLOC_OFF	0x80000000
 
+/* Initialize the devices private memory region */
+int qbman_init_private_mem(struct device *dev, int idx, dma_addr_t *addr,
+				size_t *size);
+
 #endif	/* __DPAA_SYS_H */
-- 
2.7.4