drivers/soc/fsl/qbman/dpaa_sys.c

   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  */
  37 int 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 }