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/* 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, const char *compat,
dma_addr_t *addr, size_t *size)
{
struct device_node *mem_node;
struct reserved_mem *rmem;
int err;
__be32 *res_array;
mem_node = of_parse_phandle(dev->of_node, "memory-region", idx);
if (!mem_node) {
mem_node = of_find_compatible_node(NULL, NULL, compat);
if (!mem_node) {
dev_err(dev, "No memory-region found for index %d or compatible '%s'\n",
idx, compat);
return -ENODEV;
}
}
rmem = of_reserved_mem_lookup(mem_node);
if (!rmem) {
dev_err(dev, "of_reserved_mem_lookup() returned NULL\n");
return -ENODEV;
}
*addr = rmem->base;
*size = rmem->size;
/*
* Check if the reg property exists - if not insert the node
* so upon kexec() the same memory region address will be preserved.
* This is needed because QBMan HW does not allow the base address/
* size to be modified once set.
*/
if (!of_property_present(mem_node, "reg")) {
struct property *prop;
prop = devm_kzalloc(dev, sizeof(*prop), GFP_KERNEL);
if (!prop)
return -ENOMEM;
prop->value = res_array = devm_kzalloc(dev, sizeof(__be32) * 4,
GFP_KERNEL);
if (!prop->value)
return -ENOMEM;
res_array[0] = cpu_to_be32(upper_32_bits(*addr));
res_array[1] = cpu_to_be32(lower_32_bits(*addr));
res_array[2] = cpu_to_be32(upper_32_bits(*size));
res_array[3] = cpu_to_be32(lower_32_bits(*size));
prop->length = sizeof(__be32) * 4;
prop->name = devm_kstrdup(dev, "reg", GFP_KERNEL);
if (!prop->name)
return -ENOMEM;
err = of_add_property(mem_node, prop);
if (err)
return err;
}
return 0;
}
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