stand/powerpc/ofw/ofwfdt.c

   1 /*-
   2  * Copyright (C) 2014-2015 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/cdefs.h>
  27 __FBSDID("$FreeBSD$");
  28
  29 #include <stand.h>
  30 #include <sys/param.h>
  31 #include <fdt_platform.h>
  32 #include <openfirm.h>
  33 #include <libfdt.h>
  34 #include "bootstrap.h"
  35
  36 extern int command_fdt_internal(int argc, char *argv[]);
  37
  38 static int
  39 OF_hasprop(phandle_t node, const char *prop)
  40 {
  41         return (OF_getproplen(node, (char *)prop) > 0);
  42 }
  43
  44 static void
  45 add_node_to_fdt(void *buffer, phandle_t node, int fdt_offset)
  46 {
  47         int i, child_offset, error;
  48         char name[255], *lastprop, *subname;
  49         void *propbuf;
  50         ssize_t proplen;
  51
  52         lastprop = NULL;
  53         while (OF_nextprop(node, lastprop, name) > 0) {
  54                 proplen = OF_getproplen(node, name);
  55
  56                 /* Detect and correct for errors and strangeness */
  57                 if (proplen < 0)
  58                         proplen = 0;
  59                 if (proplen > 1024)
  60                         proplen = 1024;
  61
  62                 propbuf = malloc(proplen);
  63                 if (propbuf == NULL) {
  64                         printf("Cannot allocate memory for prop %s\n", name);
  65                         return;
  66                 }
  67                 OF_getprop(node, name, propbuf, proplen);
  68                 error = fdt_setprop(buffer, fdt_offset, name, propbuf, proplen);
  69                 free(propbuf);
  70                 lastprop = name;
  71                 if (error)
  72                         printf("Error %d adding property %s to "
  73                             "node %d\n", error, name, fdt_offset);
  74         }
  75
  76         if (!OF_hasprop(node, "phandle") && !OF_hasprop(node, "linux,phandle")
  77             && !OF_hasprop(node, "ibm,phandle"))
  78                 fdt_setprop(buffer, fdt_offset, "phandle", &node, sizeof(node));
  79
  80         for (node = OF_child(node); node > 0; node = OF_peer(node)) {
  81                 OF_package_to_path(node, name, sizeof(name));
  82                 subname = strrchr(name, '/');
  83                 subname++;
  84                 child_offset = fdt_add_subnode(buffer, fdt_offset, subname);
  85                 if (child_offset < 0) {
  86                         printf("Error %d adding node %s (%s), skipping\n",
  87                             child_offset, name, subname);
  88                         continue;
  89                 }
  90
  91                 add_node_to_fdt(buffer, node, child_offset);
  92         }
  93 }
  94
  95 static void
  96 ofwfdt_fixups(void *fdtp)
  97 {
  98         int offset, len, i;
  99         phandle_t node;
 100         ihandle_t rtas;
 101         const void *prop;
 102
 103         /*
 104          * Instantiate and add reservations for RTAS state if present
 105          */
 106
 107         offset = fdt_path_offset(fdtp, "/rtas");
 108         if (offset > 0) {
 109                 uint32_t base;
 110                 void *rtasmem;
 111                 char path[255];
 112
 113                 node = OF_finddevice("/rtas");
 114                 OF_package_to_path(node, path, sizeof(path));
 115                 OF_getprop(node, "rtas-size", &len, sizeof(len));
 116
 117                 /* Allocate memory */
 118                 rtasmem = OF_claim(0, len, 4096);
 119
 120                 /* Instantiate RTAS */
 121                 rtas = OF_open(path);
 122                 base = 0;
 123                 OF_call_method("instantiate-rtas", rtas, 1, 1, (cell_t)rtas,
 124                     &base);
 125
 126                 /* Store info to FDT using Linux convention */
 127                 base = cpu_to_fdt32(base);
 128                 fdt_setprop(fdtp, offset, "linux,rtas-entry", &base,
 129                     sizeof(base));
 130                 base = cpu_to_fdt32((uint32_t)rtasmem);
 131                 offset = fdt_path_offset(fdtp, "/rtas");
 132                 fdt_setprop(fdtp, offset, "linux,rtas-base", &base,
 133                     sizeof(base));
 134
 135                 /* Mark RTAS private data area reserved */
 136                 fdt_add_mem_rsv(fdtp, base, len);
 137         } else {
 138                 /*
 139                  * Remove /memory/available properties, which reflect long-gone
 140                  * OF state. Note that this doesn't work if we need RTAS still,
 141                  * since that's part of the firmware.
 142                  */
 143                 offset = fdt_path_offset(fdtp, "/memory@0");
 144                 if (offset > 0)
 145                         fdt_delprop(fdtp, offset, "available");
 146         }
 147
 148
 149         /*
 150          * Convert stored ihandles under /chosen to xref phandles
 151          */
 152         offset = fdt_path_offset(fdtp, "/chosen");
 153         if (offset > 0) {
 154                 const char *chosenprops[] = {"stdout", "stdin", "mmu", "cpu",
 155                     NULL};
 156                 const uint32_t *ihand;
 157                 for (i = 0; chosenprops[i] != NULL; i++) {
 158                         ihand = fdt_getprop(fdtp, offset, chosenprops[i], &len);
 159                         if (ihand != NULL && len == sizeof(*ihand)) {
 160                                 node = OF_instance_to_package(
 161                                     fdt32_to_cpu(*ihand));
 162                                 if (OF_hasprop(node, "phandle"))
 163                                         OF_getprop(node, "phandle", &node,
 164                                             sizeof(node));
 165                                 else if (OF_hasprop(node, "linux,phandle"))
 166                                         OF_getprop(node, "linux,phandle", &node,
 167                                             sizeof(node));
 168                                 else if (OF_hasprop(node, "ibm,phandle"))
 169                                         OF_getprop(node, "ibm,phandle", &node,
 170                                             sizeof(node));
 171                                 node = cpu_to_fdt32(node);
 172                                 fdt_setprop(fdtp, offset, chosenprops[i], &node,
 173                                     sizeof(node));
 174                         }
 175
 176                         /* Refind node in case it moved */
 177                         offset = fdt_path_offset(fdtp, "/chosen");
 178                 }
 179         }
 180 }
 181
 182 int
 183 fdt_platform_load_dtb(void)
 184 {
 185         void *buffer;
 186         size_t buflen = 409600;
 187
 188         buffer = malloc(buflen);
 189         fdt_create_empty_tree(buffer, buflen);
 190         add_node_to_fdt(buffer, OF_peer(0), fdt_path_offset(buffer, "/"));
 191         ofwfdt_fixups(buffer);
 192         fdt_pack(buffer);
 193
 194         fdt_load_dtb_addr(buffer);
 195         free(buffer);
 196
 197         return (0);
 198 }
 199
 200 void
 201 fdt_platform_load_overlays(void)
 202 {
 203
 204 }
 205
 206 void
 207 fdt_platform_fixups(void)
 208 {
 209
 210 }
 211
 212 static int
 213 command_fdt(int argc, char *argv[])
 214 {
 215
 216         return (command_fdt_internal(argc, argv));
 217 }
 218
 219 COMMAND_SET(fdt, "fdt", "flattened device tree handling", command_fdt);
 220