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
  24 #include <asm/prom.h>
  25 #include <asm/oplib.h>
  26 #include <asm/leon.h>
  27 #include <asm/leon_amba.h>
  28
  29 #include "prom.h"
  30
  31 void * __init prom_early_alloc(unsigned long size)
  32 {
  33         void *ret;
  34
  35         ret = __alloc_bootmem(size, SMP_CACHE_BYTES, 0UL);
  36         if (ret != NULL)
  37                 memset(ret, 0, size);
  38
  39         prom_early_allocated += size;
  40
  41         return ret;
  42 }
  43
  44 /* The following routines deal with the black magic of fully naming a
  45  * node.
  46  *
  47  * Certain well known named nodes are just the simple name string.
  48  *
  49  * Actual devices have an address specifier appended to the base name
  50  * string, like this "foo@addr".  The "addr" can be in any number of
  51  * formats, and the platform plus the type of the node determine the
  52  * format and how it is constructed.
  53  *
  54  * For children of the ROOT node, the naming convention is fixed and
  55  * determined by whether this is a sun4u or sun4v system.
  56  *
  57  * For children of other nodes, it is bus type specific.  So
  58  * we walk up the tree until we discover a "device_type" property
  59  * we recognize and we go from there.
  60  */
  61 static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
  62 {
  63         struct linux_prom_registers *regs;
  64         struct property *rprop;
  65
  66         rprop = of_find_property(dp, "reg", NULL);
  67         if (!rprop)
  68                 return;
  69
  70         regs = rprop->value;
  71         sprintf(tmp_buf, "%s@%x,%x",
  72                 dp->name,
  73                 regs->which_io, regs->phys_addr);
  74 }
  75
  76 /* "name@slot,offset"  */
  77 static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
  78 {
  79         struct linux_prom_registers *regs;
  80         struct property *prop;
  81
  82         prop = of_find_property(dp, "reg", NULL);
  83         if (!prop)
  84                 return;
  85
  86         regs = prop->value;
  87         sprintf(tmp_buf, "%s@%x,%x",
  88                 dp->name,
  89                 regs->which_io,
  90                 regs->phys_addr);
  91 }
  92
  93 /* "name@devnum[,func]" */
  94 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
  95 {
  96         struct linux_prom_pci_registers *regs;
  97         struct property *prop;
  98         unsigned int devfn;
  99
 100         prop = of_find_property(dp, "reg", NULL);
 101         if (!prop)
 102                 return;
 103
 104         regs = prop->value;
 105         devfn = (regs->phys_hi >> 8) & 0xff;
 106         if (devfn & 0x07) {
 107                 sprintf(tmp_buf, "%s@%x,%x",
 108                         dp->name,
 109                         devfn >> 3,
 110                         devfn & 0x07);
 111         } else {
 112                 sprintf(tmp_buf, "%s@%x",
 113                         dp->name,
 114                         devfn >> 3);
 115         }
 116 }
 117
 118 /* "name@addrhi,addrlo" */
 119 static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 120 {
 121         struct linux_prom_registers *regs;
 122         struct property *prop;
 123
 124         prop = of_find_property(dp, "reg", NULL);
 125         if (!prop)
 126                 return;
 127
 128         regs = prop->value;
 129
 130         sprintf(tmp_buf, "%s@%x,%x",
 131                 dp->name,
 132                 regs->which_io, regs->phys_addr);
 133 }
 134
 135 /* "name:vendor:device@irq,addrlo" */
 136 static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
 137 {
 138         struct amba_prom_registers *regs;
 139         unsigned int *intr, *device, *vendor, reg0;
 140         struct property *prop;
 141         int interrupt = 0;
 142
 143         /* In order to get a unique ID in the device tree (multiple AMBA devices
 144          * may have the same name) the node number is printed
 145          */
 146         prop = of_find_property(dp, "reg", NULL);
 147         if (!prop) {
 148                 reg0 = (unsigned int)dp->phandle;
 149         } else {
 150                 regs = prop->value;
 151                 reg0 = regs->phys_addr;
 152         }
 153
 154         /* Not all cores have Interrupt */
 155         prop = of_find_property(dp, "interrupts", NULL);
 156         if (!prop)
 157                 intr = &interrupt; /* IRQ0 does not exist */
 158         else
 159                 intr = prop->value;
 160
 161         prop = of_find_property(dp, "vendor", NULL);
 162         if (!prop)
 163                 return;
 164         vendor = prop->value;
 165         prop = of_find_property(dp, "device", NULL);
 166         if (!prop)
 167                 return;
 168         device = prop->value;
 169
 170         sprintf(tmp_buf, "%s:%d:%d@%x,%x",
 171                 dp->name, *vendor, *device,
 172                 *intr, reg0);
 173 }
 174
 175 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
 176 {
 177         struct device_node *parent = dp->parent;
 178
 179         if (parent != NULL) {
 180                 if (!strcmp(parent->type, "pci") ||
 181                     !strcmp(parent->type, "pciex"))
 182                         return pci_path_component(dp, tmp_buf);
 183                 if (!strcmp(parent->type, "sbus"))
 184                         return sbus_path_component(dp, tmp_buf);
 185                 if (!strcmp(parent->type, "ebus"))
 186                         return ebus_path_component(dp, tmp_buf);
 187                 if (!strcmp(parent->type, "ambapp"))
 188                         return ambapp_path_component(dp, tmp_buf);
 189
 190                 /* "isa" is handled with platform naming */
 191         }
 192
 193         /* Use platform naming convention.  */
 194         return sparc32_path_component(dp, tmp_buf);
 195 }
 196
 197 char * __init build_path_component(struct device_node *dp)
 198 {
 199         char tmp_buf[64], *n;
 200
 201         tmp_buf[0] = '\0';
 202         __build_path_component(dp, tmp_buf);
 203         if (tmp_buf[0] == '\0')
 204                 strcpy(tmp_buf, dp->name);
 205
 206         n = prom_early_alloc(strlen(tmp_buf) + 1);
 207         strcpy(n, tmp_buf);
 208
 209         return n;
 210 }
 211
 212 extern void restore_current(void);
 213
 214 void __init of_console_init(void)
 215 {
 216         char *msg = "OF stdout device is: %s\n";
 217         struct device_node *dp;
 218         unsigned long flags;
 219         const char *type;
 220         phandle node;
 221         int skip, tmp, fd;
 222
 223         of_console_path = prom_early_alloc(256);
 224
 225         switch (prom_vers) {
 226         case PROM_V0:
 227                 skip = 0;
 228                 switch (*romvec->pv_stdout) {
 229                 case PROMDEV_SCREEN:
 230                         type = "display";
 231                         break;
 232
 233                 case PROMDEV_TTYB:
 234                         skip = 1;
 235                         /* FALLTHRU */
 236
 237                 case PROMDEV_TTYA:
 238                         type = "serial";
 239                         break;
 240
 241                 default:
 242                         prom_printf("Invalid PROM_V0 stdout value %u\n",
 243                                     *romvec->pv_stdout);
 244                         prom_halt();
 245                 }
 246
 247                 tmp = skip;
 248                 for_each_node_by_type(dp, type) {
 249                         if (!tmp--)
 250                                 break;
 251                 }
 252                 if (!dp) {
 253                         prom_printf("Cannot find PROM_V0 console node.\n");
 254                         prom_halt();
 255                 }
 256                 of_console_device = dp;
 257
 258                 strcpy(of_console_path, dp->full_name);
 259                 if (!strcmp(type, "serial")) {
 260                         strcat(of_console_path,
 261                                (skip ? ":b" : ":a"));
 262                 }
 263                 break;
 264
 265         default:
 266         case PROM_V2:
 267         case PROM_V3:
 268                 fd = *romvec->pv_v2bootargs.fd_stdout;
 269
 270                 spin_lock_irqsave(&prom_lock, flags);
 271                 node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
 272                 restore_current();
 273                 spin_unlock_irqrestore(&prom_lock, flags);
 274
 275                 if (!node) {
 276                         prom_printf("Cannot resolve stdout node from "
 277                                     "instance %08x.\n", fd);
 278                         prom_halt();
 279                 }
 280                 dp = of_find_node_by_phandle(node);
 281                 type = of_get_property(dp, "device_type", NULL);
 282
 283                 if (!type) {
 284                         prom_printf("Console stdout lacks "
 285                                     "device_type property.\n");
 286                         prom_halt();
 287                 }
 288
 289                 if (strcmp(type, "display") && strcmp(type, "serial")) {
 290                         prom_printf("Console device_type is neither display "
 291                                     "nor serial.\n");
 292                         prom_halt();
 293                 }
 294
 295                 of_console_device = dp;
 296
 297                 if (prom_vers == PROM_V2) {
 298                         strcpy(of_console_path, dp->full_name);
 299                         switch (*romvec->pv_stdout) {
 300                         case PROMDEV_TTYA:
 301                                 strcat(of_console_path, ":a");
 302                                 break;
 303                         case PROMDEV_TTYB:
 304                                 strcat(of_console_path, ":b");
 305                                 break;
 306                         }
 307                 } else {
 308                         const char *path;
 309
 310                         dp = of_find_node_by_path("/");
 311                         path = of_get_property(dp, "stdout-path", NULL);
 312                         if (!path) {
 313                                 prom_printf("No stdout-path in root node.\n");
 314                                 prom_halt();
 315                         }
 316                         strcpy(of_console_path, path);
 317                 }
 318                 break;
 319         }
 320
 321         of_console_options = strrchr(of_console_path, ':');
 322         if (of_console_options) {
 323                 of_console_options++;
 324                 if (*of_console_options == '\0')
 325                         of_console_options = NULL;
 326         }
 327
 328         printk(msg, of_console_path);
 329 }
 330
 331 void __init of_fill_in_cpu_data(void)
 332 {
 333 }
 334
 335 void __init irq_trans_init(struct device_node *dp)
 336 {
 337 }