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 void * __init prom_early_alloc(unsigned long size)
  31 {
  32         void *ret;
  33
  34         ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
  35         if (ret != NULL)
  36                 memset(ret, 0, size);
  37
  38         prom_early_allocated += size;
  39
  40         return ret;
  41 }
  42
  43 /* The following routines deal with the black magic of fully naming a
  44  * node.
  45  *
  46  * Certain well known named nodes are just the simple name string.
  47  *
  48  * Actual devices have an address specifier appended to the base name
  49  * string, like this "foo@addr".  The "addr" can be in any number of
  50  * formats, and the platform plus the type of the node determine the
  51  * format and how it is constructed.
  52  *
  53  * For children of the ROOT node, the naming convention is fixed and
  54  * determined by whether this is a sun4u or sun4v system.
  55  *
  56  * For children of other nodes, it is bus type specific.  So
  57  * we walk up the tree until we discover a "device_type" property
  58  * we recognize and we go from there.
  59  */
  60 static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
  61 {
  62         struct linux_prom_registers *regs;
  63         struct property *rprop;
  64
  65         rprop = of_find_property(dp, "reg", NULL);
  66         if (!rprop)
  67                 return;
  68
  69         regs = rprop->value;
  70         sprintf(tmp_buf, "%s@%x,%x",
  71                 dp->name,
  72                 regs->which_io, regs->phys_addr);
  73 }
  74
  75 /* "name@slot,offset"  */
  76 static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
  77 {
  78         struct linux_prom_registers *regs;
  79         struct property *prop;
  80
  81         prop = of_find_property(dp, "reg", NULL);
  82         if (!prop)
  83                 return;
  84
  85         regs = prop->value;
  86         sprintf(tmp_buf, "%s@%x,%x",
  87                 dp->name,
  88                 regs->which_io,
  89                 regs->phys_addr);
  90 }
  91
  92 /* "name@devnum[,func]" */
  93 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
  94 {
  95         struct linux_prom_pci_registers *regs;
  96         struct property *prop;
  97         unsigned int devfn;
  98
  99         prop = of_find_property(dp, "reg", NULL);
 100         if (!prop)
 101                 return;
 102
 103         regs = prop->value;
 104         devfn = (regs->phys_hi >> 8) & 0xff;
 105         if (devfn & 0x07) {
 106                 sprintf(tmp_buf, "%s@%x,%x",
 107                         dp->name,
 108                         devfn >> 3,
 109                         devfn & 0x07);
 110         } else {
 111                 sprintf(tmp_buf, "%s@%x",
 112                         dp->name,
 113                         devfn >> 3);
 114         }
 115 }
 116
 117 /* "name@addrhi,addrlo" */
 118 static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 119 {
 120         struct linux_prom_registers *regs;
 121         struct property *prop;
 122
 123         prop = of_find_property(dp, "reg", NULL);
 124         if (!prop)
 125                 return;
 126
 127         regs = prop->value;
 128
 129         sprintf(tmp_buf, "%s@%x,%x",
 130                 dp->name,
 131                 regs->which_io, regs->phys_addr);
 132 }
 133
 134 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
 135 {
 136         struct device_node *parent = dp->parent;
 137
 138         if (parent != NULL) {
 139                 if (!strcmp(parent->type, "pci") ||
 140                     !strcmp(parent->type, "pciex"))
 141                         return pci_path_component(dp, tmp_buf);
 142                 if (!strcmp(parent->type, "sbus"))
 143                         return sbus_path_component(dp, tmp_buf);
 144                 if (!strcmp(parent->type, "ebus"))
 145                         return ebus_path_component(dp, tmp_buf);
 146
 147                 /* "isa" is handled with platform naming */
 148         }
 149
 150         /* Use platform naming convention.  */
 151         return sparc32_path_component(dp, tmp_buf);
 152 }
 153
 154 char * __init build_path_component(struct device_node *dp)
 155 {
 156         char tmp_buf[64], *n;
 157
 158         tmp_buf[0] = '\0';
 159         __build_path_component(dp, tmp_buf);
 160         if (tmp_buf[0] == '\0')
 161                 strcpy(tmp_buf, dp->name);
 162
 163         n = prom_early_alloc(strlen(tmp_buf) + 1);
 164         strcpy(n, tmp_buf);
 165
 166         return n;
 167 }
 168
 169 extern void restore_current(void);
 170
 171 void __init of_console_init(void)
 172 {
 173         char *msg = "OF stdout device is: %s\n";
 174         struct device_node *dp;
 175         unsigned long flags;
 176         const char *type;
 177         phandle node;
 178         int skip, tmp, fd;
 179
 180         of_console_path = prom_early_alloc(256);
 181
 182         switch (prom_vers) {
 183         case PROM_V0:
 184                 skip = 0;
 185                 switch (*romvec->pv_stdout) {
 186                 case PROMDEV_SCREEN:
 187                         type = "display";
 188                         break;
 189
 190                 case PROMDEV_TTYB:
 191                         skip = 1;
 192                         /* FALLTHRU */
 193
 194                 case PROMDEV_TTYA:
 195                         type = "serial";
 196                         break;
 197
 198                 default:
 199                         prom_printf("Invalid PROM_V0 stdout value %u\n",
 200                                     *romvec->pv_stdout);
 201                         prom_halt();
 202                 }
 203
 204                 tmp = skip;
 205                 for_each_node_by_type(dp, type) {
 206                         if (!tmp--)
 207                                 break;
 208                 }
 209                 if (!dp) {
 210                         prom_printf("Cannot find PROM_V0 console node.\n");
 211                         prom_halt();
 212                 }
 213                 of_console_device = dp;
 214
 215                 strcpy(of_console_path, dp->full_name);
 216                 if (!strcmp(type, "serial")) {
 217                         strcat(of_console_path,
 218                                (skip ? ":b" : ":a"));
 219                 }
 220                 break;
 221
 222         default:
 223         case PROM_V2:
 224         case PROM_V3:
 225                 fd = *romvec->pv_v2bootargs.fd_stdout;
 226
 227                 spin_lock_irqsave(&prom_lock, flags);
 228                 node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
 229                 restore_current();
 230                 spin_unlock_irqrestore(&prom_lock, flags);
 231
 232                 if (!node) {
 233                         prom_printf("Cannot resolve stdout node from "
 234                                     "instance %08x.\n", fd);
 235                         prom_halt();
 236                 }
 237                 dp = of_find_node_by_phandle(node);
 238                 type = of_get_property(dp, "device_type", NULL);
 239
 240                 if (!type) {
 241                         prom_printf("Console stdout lacks "
 242                                     "device_type property.\n");
 243                         prom_halt();
 244                 }
 245
 246                 if (strcmp(type, "display") && strcmp(type, "serial")) {
 247                         prom_printf("Console device_type is neither display "
 248                                     "nor serial.\n");
 249                         prom_halt();
 250                 }
 251
 252                 of_console_device = dp;
 253
 254                 if (prom_vers == PROM_V2) {
 255                         strcpy(of_console_path, dp->full_name);
 256                         switch (*romvec->pv_stdout) {
 257                         case PROMDEV_TTYA:
 258                                 strcat(of_console_path, ":a");
 259                                 break;
 260                         case PROMDEV_TTYB:
 261                                 strcat(of_console_path, ":b");
 262                                 break;
 263                         }
 264                 } else {
 265                         const char *path;
 266
 267                         dp = of_find_node_by_path("/");
 268                         path = of_get_property(dp, "stdout-path", NULL);
 269                         if (!path) {
 270                                 prom_printf("No stdout-path in root node.\n");
 271                                 prom_halt();
 272                         }
 273                         strcpy(of_console_path, path);
 274                 }
 275                 break;
 276         }
 277
 278         of_console_options = strrchr(of_console_path, ':');
 279         if (of_console_options) {
 280                 of_console_options++;
 281                 if (*of_console_options == '\0')
 282                         of_console_options = NULL;
 283         }
 284
 285         prom_printf(msg, of_console_path);
 286         printk(msg, of_console_path);
 287 }
 288
 289 void __init of_fill_in_cpu_data(void)
 290 {
 291 }
 292
 293 void __init irq_trans_init(struct device_node *dp)
 294 {
 295 }