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 } 90