90 lines
3.3 KiB
C
90 lines
3.3 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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struct device_node *mem_node;
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struct reserved_mem *rmem;
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struct property *prop;
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int len, err;
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__be32 *res_array;
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mem_node = of_parse_phandle(dev->of_node, "memory-region", idx);
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if (!mem_node) {
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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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rmem = of_reserved_mem_lookup(mem_node);
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if (!rmem) {
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dev_err(dev, "of_reserved_mem_lookup() returned NULL\n");
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return -ENODEV;
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}
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*addr = rmem->base;
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*size = rmem->size;
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/*
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* Check if the reg property exists - if not insert the node
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* so upon kexec() the same memory region address will be preserved.
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* This is needed because QBMan HW does not allow the base address/
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* size to be modified once set.
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*/
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prop = of_find_property(mem_node, "reg", &len);
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if (!prop) {
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prop = devm_kzalloc(dev, sizeof(*prop), GFP_KERNEL);
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if (!prop)
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return -ENOMEM;
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prop->value = res_array = devm_kzalloc(dev, sizeof(__be32) * 4,
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GFP_KERNEL);
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if (!prop->value)
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return -ENOMEM;
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res_array[0] = cpu_to_be32(upper_32_bits(*addr));
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res_array[1] = cpu_to_be32(lower_32_bits(*addr));
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res_array[2] = cpu_to_be32(upper_32_bits(*size));
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res_array[3] = cpu_to_be32(lower_32_bits(*size));
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prop->length = sizeof(__be32) * 4;
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prop->name = devm_kstrdup(dev, "reg", GFP_KERNEL);
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if (!prop->name)
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return -ENOMEM;
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err = of_add_property(mem_node, prop);
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if (err)
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return err;
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}
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return 0;
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}
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