LXR linux/drivers/soc/fsl/qbman/dpaa

   1/* Copyright 2017 NXP Semiconductor, Inc.
   2 *
   3 * Redistribution and use in source and binary forms, with or without
   4 * modification, are permitted provided that the following conditions are met:
   5 *     * Redistributions of source code must retain the above copyright
   6 *       notice, this list of conditions and the following disclaimer.
   7 *     * Redistributions in binary form must reproduce the above copyright
   8 *       notice, this list of conditions and the following disclaimer in the
   9 *       documentation and/or other materials provided with the distribution.
  10 *     * Neither the name of NXP Semiconductor nor the
  11 *       names of its contributors may be used to endorse or promote products
  12 *       derived from this software without specific prior written permission.
  13 *
  14 * ALTERNATIVELY, this software may be distributed under the terms of the
  15 * GNU General Public License ("GPL") as published by the Free Software
  16 * Foundation, either version 2 of that License or (at your option) any
  17 * later version.
  18 *
  19 * THIS SOFTWARE IS PROVIDED BY NXP Semiconductor ``AS IS'' AND ANY
  20 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  22 * DISCLAIMED. IN NO EVENT SHALL NXP Semiconductor BE LIABLE FOR ANY
  23 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  26 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  28 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29 */
  30
  31#include <linux/dma-mapping.h>
  32#include "dpaa_sys.h"
  33
  34/*
  35 * Initialize a devices private memory region
  36 */
  37int qbman_init_private_mem(struct device *dev, int idx, dma_addr_t *addr,
  38                                size_t *size)
  39{
  40        struct device_node *mem_node;
  41        struct reserved_mem *rmem;
  42        struct property *prop;
  43        int len, err;
  44        __be32 *res_array;
  45
  46        mem_node = of_parse_phandle(dev->of_node, "memory-region", idx);
  47        if (!mem_node) {
  48                dev_err(dev, "No memory-region found for index %d\n", idx);
  49                return -ENODEV;
  50        }
  51
  52        rmem = of_reserved_mem_lookup(mem_node);
  53        if (!rmem) {
  54                dev_err(dev, "of_reserved_mem_lookup() returned NULL\n");
  55                return -ENODEV;
  56        }
  57        *addr = rmem->base;
  58        *size = rmem->size;
  59
  60        /*
  61         * Check if the reg property exists - if not insert the node
  62         * so upon kexec() the same memory region address will be preserved.
  63         * This is needed because QBMan HW does not allow the base address/
  64         * size to be modified once set.
  65         */
  66        prop = of_find_property(mem_node, "reg", &len);
  67        if (!prop) {
  68                prop = devm_kzalloc(dev, sizeof(*prop), GFP_KERNEL);
  69                if (!prop)
  70                        return -ENOMEM;
  71                prop->value = res_array = devm_kzalloc(dev, sizeof(__be32) * 4,
  72                                                       GFP_KERNEL);
  73                if (!prop->value)
  74                        return -ENOMEM;
  75                res_array[0] = cpu_to_be32(upper_32_bits(*addr));
  76                res_array[1] = cpu_to_be32(lower_32_bits(*addr));
  77                res_array[2] = cpu_to_be32(upper_32_bits(*size));
  78                res_array[3] = cpu_to_be32(lower_32_bits(*size));
  79                prop->length = sizeof(__be32) * 4;
  80                prop->name = devm_kstrdup(dev, "reg", GFP_KERNEL);
  81                if (!prop->name)
  82                        return -ENOMEM;
  83                err = of_add_property(mem_node, prop);
  84                if (err)
  85                        return err;
  86        }
  87
  88        return 0;
  89}
  90