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 #include <asm/leon.h>
  28 #include <asm/leon_amba.h>
  29
  30 #include "prom.h"
  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 /* "name:vendor:device@irq,addrlo" */
 137 static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
 138 {
 139         struct amba_prom_registers *regs;
 140         unsigned int *intr, *device, *vendor, reg0;
 141         struct property *prop;
 142         int interrupt = 0;
 143
 144         /* In order to get a unique ID in the device tree (multiple AMBA devices
 145          * may have the same name) the node number is printed
 146          */
 147         prop = of_find_property(dp, "reg", NULL);
 148         if (!prop) {
 149                 reg0 = (unsigned int)dp->phandle;
 150         } else {
 151                 regs = prop->value;
 152                 reg0 = regs->phys_addr;
 153         }
 154
 155         /* Not all cores have Interrupt */
 156         prop = of_find_property(dp, "interrupts", NULL);
 157         if (!prop)
 158                 intr = &interrupt; /* IRQ0 does not exist */
 159         else
 160                 intr = prop->value;
 161
 162         prop = of_find_property(dp, "vendor", NULL);
 163         if (!prop)
 164                 return;
 165         vendor = prop->value;
 166         prop = of_find_property(dp, "device", NULL);
 167         if (!prop)
 168                 return;
 169         device = prop->value;
 170
 171         sprintf(tmp_buf, "%s:%d:%d@%x,%x",
 172                 dp->name, *vendor, *device,
 173                 *intr, reg0);
 174 }
 175
 176 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
 177 {
 178         struct device_node *parent = dp->parent;
 179
 180         if (parent != NULL) {
 181                 if (!strcmp(parent->type, "pci") ||
 182                     !strcmp(parent->type, "pciex"))
 183                         return pci_path_component(dp, tmp_buf);
 184                 if (!strcmp(parent->type, "sbus"))
 185                         return sbus_path_component(dp, tmp_buf);
 186                 if (!strcmp(parent->type, "ebus"))
 187                         return ebus_path_component(dp, tmp_buf);
 188                 if (!strcmp(parent->type, "ambapp"))
 189                         return ambapp_path_component(dp, tmp_buf);
 190
 191                 /* "isa" is handled with platform naming */
 192         }
 193
 194         /* Use platform naming convention.  */
 195         return sparc32_path_component(dp, tmp_buf);
 196 }
 197
 198 char * __init build_path_component(struct device_node *dp)
 199 {
 200         char tmp_buf[64], *n;
 201
 202         tmp_buf[0] = '\0';
 203         __build_path_component(dp, tmp_buf);
 204         if (tmp_buf[0] == '\0')
 205                 strcpy(tmp_buf, dp->name);
 206
 207         n = prom_early_alloc(strlen(tmp_buf) + 1);
 208         strcpy(n, tmp_buf);
 209
 210         return n;
 211 }
 212
 213 extern void restore_current(void);
 214
 215 void __init of_console_init(void)
 216 {
 217         char *msg = "OF stdout device is: %s\n";
 218         struct device_node *dp;
 219         unsigned long flags;
 220         const char *type;
 221         phandle node;
 222         int skip, tmp, fd;
 223
 224         of_console_path = prom_early_alloc(256);
 225
 226         switch (prom_vers) {
 227         case PROM_V0:
 228                 skip = 0;
 229                 switch (*romvec->pv_stdout) {
 230                 case PROMDEV_SCREEN:
 231                         type = "display";
 232                         break;
 233
 234                 case PROMDEV_TTYB:
 235                         skip = 1;
 236                         /* FALLTHRU */
 237
 238                 case PROMDEV_TTYA:
 239                         type = "serial";
 240                         break;
 241
 242                 default:
 243                         prom_printf("Invalid PROM_V0 stdout value %u\n",
 244                                     *romvec->pv_stdout);
 245                         prom_halt();
 246                 }
 247
 248                 tmp = skip;
 249                 for_each_node_by_type(dp, type) {
 250                         if (!tmp--)
 251                                 break;
 252                 }
 253                 if (!dp) {
 254                         prom_printf("Cannot find PROM_V0 console node.\n");
 255                         prom_halt();
 256                 }
 257                 of_console_device = dp;
 258
 259                 strcpy(of_console_path, dp->full_name);
 260                 if (!strcmp(type, "serial")) {
 261                         strcat(of_console_path,
 262                                (skip ? ":b" : ":a"));
 263                 }
 264                 break;
 265
 266         default:
 267         case PROM_V2:
 268         case PROM_V3:
 269                 fd = *romvec->pv_v2bootargs.fd_stdout;
 270
 271                 spin_lock_irqsave(&prom_lock, flags);
 272                 node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
 273                 restore_current();
 274                 spin_unlock_irqrestore(&prom_lock, flags);
 275
 276                 if (!node) {
 277                         prom_printf("Cannot resolve stdout node from "
 278                                     "instance %08x.\n", fd);
 279                         prom_halt();
 280                 }
 281                 dp = of_find_node_by_phandle(node);
 282                 type = of_get_property(dp, "device_type", NULL);
 283
 284                 if (!type) {
 285                         prom_printf("Console stdout lacks "
 286                                     "device_type property.\n");
 287                         prom_halt();
 288                 }
 289
 290                 if (strcmp(type, "display") && strcmp(type, "serial")) {
 291                         prom_printf("Console device_type is neither display "
 292                                     "nor serial.\n");
 293                         prom_halt();
 294                 }
 295
 296                 of_console_device = dp;
 297
 298                 if (prom_vers == PROM_V2) {
 299                         strcpy(of_console_path, dp->full_name);
 300                         switch (*romvec->pv_stdout) {
 301                         case PROMDEV_TTYA:
 302                                 strcat(of_console_path, ":a");
 303                                 break;
 304                         case PROMDEV_TTYB:
 305                                 strcat(of_console_path, ":b");
 306                                 break;
 307                         }
 308                 } else {
 309                         const char *path;
 310
 311                         dp = of_find_node_by_path("/");
 312                         path = of_get_property(dp, "stdout-path", NULL);
 313                         if (!path) {
 314                                 prom_printf("No stdout-path in root node.\n");
 315                                 prom_halt();
 316                         }
 317                         strcpy(of_console_path, path);
 318                 }
 319                 break;
 320         }
 321
 322         of_console_options = strrchr(of_console_path, ':');
 323         if (of_console_options) {
 324                 of_console_options++;
 325                 if (*of_console_options == '\0')
 326                         of_console_options = NULL;
 327         }
 328
 329         printk(msg, of_console_path);
 330 }
 331
 332 void __init of_fill_in_cpu_data(void)
 333 {
 334 }
 335
 336 void __init irq_trans_init(struct device_node *dp)
 337 {
 338 }