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         int ret;
  41         struct device_node *mem_node;
  42         u64 size64;
  43
  44         ret = of_reserved_mem_device_init_by_idx(dev, dev->of_node, idx);
  45         if (ret) {
  46                 dev_err(dev,
  47                         "of_reserved_mem_device_init_by_idx(%d) failed 0x%x\n",
  48                         idx, ret);
  49                 return -ENODEV;
  50         }
  51         mem_node = of_parse_phandle(dev->of_node, "memory-region", 0);
  52         if (mem_node) {
  53                 ret = of_property_read_u64(mem_node, "size", &size64);
  54                 if (ret) {
  55                         dev_err(dev, "of_address_to_resource fails 0x%x\n",
  56                                 ret);
  57                         return -ENODEV;
  58                 }
  59                 *size = size64;
  60         } else {
  61                 dev_err(dev, "No memory-region found for index %d\n", idx);
  62                 return -ENODEV;
  63         }
  64
  65         if (!dma_zalloc_coherent(dev, *size, addr, 0)) {
  66                 dev_err(dev, "DMA Alloc memory failed\n");
  67                 return -ENODEV;
  68         }
  69
  70         /*
  71          * Disassociate the reserved memory area from the device
  72          * because a device can only have one DMA memory area. This
  73          * should be fine since the memory is allocated and initialized
  74          * and only ever accessed by the QBMan device from now on
  75          */
  76         of_reserved_mem_device_release(dev);
  77         return 0;
  78 }