1 /*- 2 * Copyright (C) 2014 Nathan Whitehorn 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/types.h> 27 #include <fdt_platform.h> 28 #include <libfdt.h> 29 #include "kboot.h" 30 31 /* Fix up wrong values added to the device tree by prom_init() in Linux */ 32 33 void 34 fdt_arch_fixups(void *fdtp) 35 { 36 int offset, len; 37 const void *prop; 38 39 /* 40 * Remove /memory/available properties, which reflect long-gone OF 41 * state 42 */ 43 44 offset = fdt_path_offset(fdtp, "/memory@0"); 45 if (offset > 0) 46 fdt_delprop(fdtp, offset, "available"); 47 48 /* 49 * Add reservations for OPAL and RTAS state if present 50 */ 51 52 offset = fdt_path_offset(fdtp, "/ibm,opal"); 53 if (offset > 0) { 54 const uint64_t *base, *size; 55 base = fdt_getprop(fdtp, offset, "opal-base-address", 56 &len); 57 size = fdt_getprop(fdtp, offset, "opal-runtime-size", 58 &len); 59 if (base != NULL && size != NULL) 60 fdt_add_mem_rsv(fdtp, fdt64_to_cpu(*base), 61 fdt64_to_cpu(*size)); 62 } 63 offset = fdt_path_offset(fdtp, "/rtas"); 64 if (offset > 0) { 65 const uint32_t *base, *size; 66 base = fdt_getprop(fdtp, offset, "linux,rtas-base", &len); 67 size = fdt_getprop(fdtp, offset, "rtas-size", &len); 68 if (base != NULL && size != NULL) 69 fdt_add_mem_rsv(fdtp, fdt32_to_cpu(*base), 70 fdt32_to_cpu(*size)); 71 } 72 73 /* 74 * Patch up /chosen nodes so that the stored handles mean something, 75 * where possible. 76 */ 77 offset = fdt_path_offset(fdtp, "/chosen"); 78 if (offset > 0) { 79 fdt_delprop(fdtp, offset, "cpu"); /* This node not meaningful */ 80 81 offset = fdt_path_offset(fdtp, "/chosen"); 82 prop = fdt_getprop(fdtp, offset, "linux,stdout-package", &len); 83 if (prop != NULL) { 84 fdt_setprop(fdtp, offset, "stdout", prop, len); 85 offset = fdt_path_offset(fdtp, "/chosen"); 86 fdt_setprop(fdtp, offset, "stdin", prop, len); 87 } 88 } 89 } 90