arch/sparc/kernel/prom_32.c

   1 /*
   2  * Procedures for creating, accessing and interpreting the device tree.
   3  *
   4  * Paul Mackerras       August 1996.
   5  * Copyright (C) 1996-2005 Paul Mackerras.
   6  *
   7  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
   8  *    {engebret|bergner}@us.ibm.com
   9  *
  10  *  Adapted for sparc32 by David S. Miller davem@davemloft.net
  11  *
  12  *      This program is free software; you can redistribute it and/or
  13  *      modify it under the terms of the GNU General Public License
  14  *      as published by the Free Software Foundation; either version
  15  *      2 of the License, or (at your option) any later version.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/types.h>
  20 #include <linux/string.h>
  21 #include <linux/mm.h>
  22 #include <linux/bootmem.h>
  23 #include <linux/module.h>
  24
  25 #include <asm/prom.h>
  26 #include <asm/oplib.h>
  27
  28 #include "prom.h"
  29
  30 static unsigned int prom_early_allocated;
  31
  32 void * __init prom_early_alloc(unsigned long size)
  33 {
  34         void *ret;
  35
  36         ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
  37         if (ret != NULL)
  38                 memset(ret, 0, size);
  39
  40         prom_early_allocated += size;
  41
  42         return ret;
  43 }
  44
  45 /* The following routines deal with the black magic of fully naming a
  46  * node.
  47  *
  48  * Certain well known named nodes are just the simple name string.
  49  *
  50  * Actual devices have an address specifier appended to the base name
  51  * string, like this "foo@addr".  The "addr" can be in any number of
  52  * formats, and the platform plus the type of the node determine the
  53  * format and how it is constructed.
  54  *
  55  * For children of the ROOT node, the naming convention is fixed and
  56  * determined by whether this is a sun4u or sun4v system.
  57  *
  58  * For children of other nodes, it is bus type specific.  So
  59  * we walk up the tree until we discover a "device_type" property
  60  * we recognize and we go from there.
  61  */
  62 static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
  63 {
  64         struct linux_prom_registers *regs;
  65         struct property *rprop;
  66
  67         rprop = of_find_property(dp, "reg", NULL);
  68         if (!rprop)
  69                 return;
  70
  71         regs = rprop->value;
  72         sprintf(tmp_buf, "%s@%x,%x",
  73                 dp->name,
  74                 regs->which_io, regs->phys_addr);
  75 }
  76
  77 /* "name@slot,offset"  */
  78 static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
  79 {
  80         struct linux_prom_registers *regs;
  81         struct property *prop;
  82
  83         prop = of_find_property(dp, "reg", NULL);
  84         if (!prop)
  85                 return;
  86
  87         regs = prop->value;
  88         sprintf(tmp_buf, "%s@%x,%x",
  89                 dp->name,
  90                 regs->which_io,
  91                 regs->phys_addr);
  92 }
  93
  94 /* "name@devnum[,func]" */
  95 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
  96 {
  97         struct linux_prom_pci_registers *regs;
  98         struct property *prop;
  99         unsigned int devfn;
 100
 101         prop = of_find_property(dp, "reg", NULL);
 102         if (!prop)
 103                 return;
 104
 105         regs = prop->value;
 106         devfn = (regs->phys_hi >> 8) & 0xff;
 107         if (devfn & 0x07) {
 108                 sprintf(tmp_buf, "%s@%x,%x",
 109                         dp->name,
 110                         devfn >> 3,
 111                         devfn & 0x07);
 112         } else {
 113                 sprintf(tmp_buf, "%s@%x",
 114                         dp->name,
 115                         devfn >> 3);
 116         }
 117 }
 118
 119 /* "name@addrhi,addrlo" */
 120 static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 121 {
 122         struct linux_prom_registers *regs;
 123         struct property *prop;
 124
 125         prop = of_find_property(dp, "reg", NULL);
 126         if (!prop)
 127                 return;
 128
 129         regs = prop->value;
 130
 131         sprintf(tmp_buf, "%s@%x,%x",
 132                 dp->name,
 133                 regs->which_io, regs->phys_addr);
 134 }
 135
 136 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
 137 {
 138         struct device_node *parent = dp->parent;
 139
 140         if (parent != NULL) {
 141                 if (!strcmp(parent->type, "pci") ||
 142                     !strcmp(parent->type, "pciex"))
 143                         return pci_path_component(dp, tmp_buf);
 144                 if (!strcmp(parent->type, "sbus"))
 145                         return sbus_path_component(dp, tmp_buf);
 146                 if (!strcmp(parent->type, "ebus"))
 147                         return ebus_path_component(dp, tmp_buf);
 148
 149                 /* "isa" is handled with platform naming */
 150         }
 151
 152         /* Use platform naming convention.  */
 153         return sparc32_path_component(dp, tmp_buf);
 154 }
 155
 156 char * __init build_path_component(struct device_node *dp)
 157 {
 158         char tmp_buf[64], *n;
 159
 160         tmp_buf[0] = '\0';
 161         __build_path_component(dp, tmp_buf);
 162         if (tmp_buf[0] == '\0')
 163                 strcpy(tmp_buf, dp->name);
 164
 165         n = prom_early_alloc(strlen(tmp_buf) + 1);
 166         strcpy(n, tmp_buf);
 167
 168         return n;
 169 }
 170
 171 struct device_node *of_console_device;
 172 EXPORT_SYMBOL(of_console_device);
 173
 174 char *of_console_path;
 175 EXPORT_SYMBOL(of_console_path);
 176
 177 char *of_console_options;
 178 EXPORT_SYMBOL(of_console_options);
 179
 180 extern void restore_current(void);
 181
 182 static void __init of_console_init(void)
 183 {
 184         char *msg = "OF stdout device is: %s\n";
 185         struct device_node *dp;
 186         unsigned long flags;
 187         const char *type;
 188         phandle node;
 189         int skip, tmp, fd;
 190
 191         of_console_path = prom_early_alloc(256);
 192
 193         switch (prom_vers) {
 194         case PROM_V0:
 195                 skip = 0;
 196                 switch (*romvec->pv_stdout) {
 197                 case PROMDEV_SCREEN:
 198                         type = "display";
 199                         break;
 200
 201                 case PROMDEV_TTYB:
 202                         skip = 1;
 203                         /* FALLTHRU */
 204
 205                 case PROMDEV_TTYA:
 206                         type = "serial";
 207                         break;
 208
 209                 default:
 210                         prom_printf("Invalid PROM_V0 stdout value %u\n",
 211                                     *romvec->pv_stdout);
 212                         prom_halt();
 213                 }
 214
 215                 tmp = skip;
 216                 for_each_node_by_type(dp, type) {
 217                         if (!tmp--)
 218                                 break;
 219                 }
 220                 if (!dp) {
 221                         prom_printf("Cannot find PROM_V0 console node.\n");
 222                         prom_halt();
 223                 }
 224                 of_console_device = dp;
 225
 226                 strcpy(of_console_path, dp->full_name);
 227                 if (!strcmp(type, "serial")) {
 228                         strcat(of_console_path,
 229                                (skip ? ":b" : ":a"));
 230                 }
 231                 break;
 232
 233         default:
 234         case PROM_V2:
 235         case PROM_V3:
 236                 fd = *romvec->pv_v2bootargs.fd_stdout;
 237
 238                 spin_lock_irqsave(&prom_lock, flags);
 239                 node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
 240                 restore_current();
 241                 spin_unlock_irqrestore(&prom_lock, flags);
 242
 243                 if (!node) {
 244                         prom_printf("Cannot resolve stdout node from "
 245                                     "instance %08x.\n", fd);
 246                         prom_halt();
 247                 }
 248                 dp = of_find_node_by_phandle(node);
 249                 type = of_get_property(dp, "device_type", NULL);
 250
 251                 if (!type) {
 252                         prom_printf("Console stdout lacks "
 253                                     "device_type property.\n");
 254                         prom_halt();
 255                 }
 256
 257                 if (strcmp(type, "display") && strcmp(type, "serial")) {
 258                         prom_printf("Console device_type is neither display "
 259                                     "nor serial.\n");
 260                         prom_halt();
 261                 }
 262
 263                 of_console_device = dp;
 264
 265                 if (prom_vers == PROM_V2) {
 266                         strcpy(of_console_path, dp->full_name);
 267                         switch (*romvec->pv_stdout) {
 268                         case PROMDEV_TTYA:
 269                                 strcat(of_console_path, ":a");
 270                                 break;
 271                         case PROMDEV_TTYB:
 272                                 strcat(of_console_path, ":b");
 273                                 break;
 274                         }
 275                 } else {
 276                         const char *path;
 277
 278                         dp = of_find_node_by_path("/");
 279                         path = of_get_property(dp, "stdout-path", NULL);
 280                         if (!path) {
 281                                 prom_printf("No stdout-path in root node.\n");
 282                                 prom_halt();
 283                         }
 284                         strcpy(of_console_path, path);
 285                 }
 286                 break;
 287         }
 288
 289         of_console_options = strrchr(of_console_path, ':');
 290         if (of_console_options) {
 291                 of_console_options++;
 292                 if (*of_console_options == '\0')
 293                         of_console_options = NULL;
 294         }
 295
 296         prom_printf(msg, of_console_path);
 297         printk(msg, of_console_path);
 298 }
 299
 300 void __init prom_build_devicetree(void)
 301 {
 302         struct device_node **nextp;
 303
 304         allnodes = prom_create_node(prom_root_node, NULL);
 305         allnodes->path_component_name = "";
 306         allnodes->full_name = "/";
 307
 308         nextp = &allnodes->allnext;
 309         allnodes->child = prom_build_tree(allnodes,
 310                                           prom_getchild(allnodes->node),
 311                                           &nextp);
 312         of_console_init();
 313
 314         printk("PROM: Built device tree with %u bytes of memory.\n",
 315                prom_early_allocated);
 316 }