mirror of https://gitee.com/openkylin/linux.git
79 lines
2.9 KiB
C
79 lines
2.9 KiB
C
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/* Copyright 2017 NXP 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 NXP 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 NXP 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 NXP 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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#include <linux/dma-mapping.h>
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#include "dpaa_sys.h"
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/*
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* Initialize a devices private memory region
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*/
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int qbman_init_private_mem(struct device *dev, int idx, dma_addr_t *addr,
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size_t *size)
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{
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int ret;
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struct device_node *mem_node;
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u64 size64;
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ret = of_reserved_mem_device_init_by_idx(dev, dev->of_node, idx);
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if (ret) {
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dev_err(dev,
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"of_reserved_mem_device_init_by_idx(%d) failed 0x%x\n",
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idx, ret);
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return -ENODEV;
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}
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mem_node = of_parse_phandle(dev->of_node, "memory-region", 0);
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if (mem_node) {
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ret = of_property_read_u64(mem_node, "size", &size64);
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if (ret) {
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dev_err(dev, "of_address_to_resource fails 0x%x\n",
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ret);
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return -ENODEV;
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}
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*size = size64;
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} else {
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dev_err(dev, "No memory-region found for index %d\n", idx);
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return -ENODEV;
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}
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if (!dma_zalloc_coherent(dev, *size, addr, 0)) {
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dev_err(dev, "DMA Alloc memory failed\n");
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return -ENODEV;
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}
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/*
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* Disassociate the reserved memory area from the device
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* because a device can only have one DMA memory area. This
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* should be fine since the memory is allocated and initialized
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* and only ever accessed by the QBMan device from now on
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*/
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of_reserved_mem_device_release(dev);
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return 0;
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}
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