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/memblock.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 = memblock_alloc(size, SMP_CACHE_BYTES);
  36         if (!ret)
  37                 panic("%s: Failed to allocate %lu bytes\n", __func__, 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         const char *name = of_get_property(dp, "name", NULL);
  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                 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         const char *name = of_get_property(dp, "name", NULL);
  81         struct linux_prom_registers *regs;
  82         struct property *prop;
  83
  84         prop = of_find_property(dp, "reg", NULL);
  85         if (!prop)
  86                 return;
  87
  88         regs = prop->value;
  89         sprintf(tmp_buf, "%s@%x,%x",
  90                 name,
  91                 regs->which_io,
  92                 regs->phys_addr);
  93 }
  94
  95 /* "name@devnum[,func]" */
  96 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
  97 {
  98         const char *name = of_get_property(dp, "name", NULL);
  99         struct linux_prom_pci_registers *regs;
 100         struct property *prop;
 101         unsigned int devfn;
 102
 103         prop = of_find_property(dp, "reg", NULL);
 104         if (!prop)
 105                 return;
 106
 107         regs = prop->value;
 108         devfn = (regs->phys_hi >> 8) & 0xff;
 109         if (devfn & 0x07) {
 110                 sprintf(tmp_buf, "%s@%x,%x",
 111                         name,
 112                         devfn >> 3,
 113                         devfn & 0x07);
 114         } else {
 115                 sprintf(tmp_buf, "%s@%x",
 116                         name,
 117                         devfn >> 3);
 118         }
 119 }
 120
 121 /* "name@addrhi,addrlo" */
 122 static void __init ebus_path_component(struct device_node *dp, char *tmp_buf)
 123 {
 124         const char *name = of_get_property(dp, "name", NULL);
 125         struct linux_prom_registers *regs;
 126         struct property *prop;
 127
 128         prop = of_find_property(dp, "reg", NULL);
 129         if (!prop)
 130                 return;
 131
 132         regs = prop->value;
 133
 134         sprintf(tmp_buf, "%s@%x,%x",
 135                 name,
 136                 regs->which_io, regs->phys_addr);
 137 }
 138
 139 /* "name:vendor:device@irq,addrlo" */
 140 static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
 141 {
 142         const char *name = of_get_property(dp, "name", NULL);
 143         struct amba_prom_registers *regs;
 144         unsigned int *intr, *device, *vendor, reg0;
 145         struct property *prop;
 146         int interrupt = 0;
 147
 148         /* In order to get a unique ID in the device tree (multiple AMBA devices
 149          * may have the same name) the node number is printed
 150          */
 151         prop = of_find_property(dp, "reg", NULL);
 152         if (!prop) {
 153                 reg0 = (unsigned int)dp->phandle;
 154         } else {
 155                 regs = prop->value;
 156                 reg0 = regs->phys_addr;
 157         }
 158
 159         /* Not all cores have Interrupt */
 160         prop = of_find_property(dp, "interrupts", NULL);
 161         if (!prop)
 162                 intr = &interrupt; /* IRQ0 does not exist */
 163         else
 164                 intr = prop->value;
 165
 166         prop = of_find_property(dp, "vendor", NULL);
 167         if (!prop)
 168                 return;
 169         vendor = prop->value;
 170         prop = of_find_property(dp, "device", NULL);
 171         if (!prop)
 172                 return;
 173         device = prop->value;
 174
 175         sprintf(tmp_buf, "%s:%d:%d@%x,%x",
 176                 name, *vendor, *device,
 177                 *intr, reg0);
 178 }
 179
 180 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
 181 {
 182         struct device_node *parent = dp->parent;
 183
 184         if (parent != NULL) {
 185                 if (of_node_is_type(parent, "pci") ||
 186                     of_node_is_type(parent, "pciex"))
 187                         return pci_path_component(dp, tmp_buf);
 188                 if (of_node_is_type(parent, "sbus"))
 189                         return sbus_path_component(dp, tmp_buf);
 190                 if (of_node_is_type(parent, "ebus"))
 191                         return ebus_path_component(dp, tmp_buf);
 192                 if (of_node_is_type(parent, "ambapp"))
 193                         return ambapp_path_component(dp, tmp_buf);
 194
 195                 /* "isa" is handled with platform naming */
 196         }
 197
 198         /* Use platform naming convention.  */
 199         return sparc32_path_component(dp, tmp_buf);
 200 }
 201
 202 char * __init build_path_component(struct device_node *dp)
 203 {
 204         const char *name = of_get_property(dp, "name", NULL);
 205         char tmp_buf[64], *n;
 206
 207         tmp_buf[0] = '\0';
 208         __build_path_component(dp, tmp_buf);
 209         if (tmp_buf[0] == '\0')
 210                 strcpy(tmp_buf, name);
 211
 212         n = prom_early_alloc(strlen(tmp_buf) + 1);
 213         strcpy(n, tmp_buf);
 214
 215         return n;
 216 }
 217
 218 extern void restore_current(void);
 219
 220 void __init of_console_init(void)
 221 {
 222         char *msg = "OF stdout device is: %s\n";
 223         struct device_node *dp;
 224         unsigned long flags;
 225         const char *type;
 226         phandle node;
 227         int skip, tmp, fd;
 228
 229         of_console_path = prom_early_alloc(256);
 230
 231         switch (prom_vers) {
 232         case PROM_V0:
 233                 skip = 0;
 234                 switch (*romvec->pv_stdout) {
 235                 case PROMDEV_SCREEN:
 236                         type = "display";
 237                         break;
 238
 239                 case PROMDEV_TTYB:
 240                         skip = 1;
 241                         /* FALLTHRU */
 242
 243                 case PROMDEV_TTYA:
 244                         type = "serial";
 245                         break;
 246
 247                 default:
 248                         prom_printf("Invalid PROM_V0 stdout value %u\n",
 249                                     *romvec->pv_stdout);
 250                         prom_halt();
 251                 }
 252
 253                 tmp = skip;
 254                 for_each_node_by_type(dp, type) {
 255                         if (!tmp--)
 256                                 break;
 257                 }
 258                 if (!dp) {
 259                         prom_printf("Cannot find PROM_V0 console node.\n");
 260                         prom_halt();
 261                 }
 262                 of_console_device = dp;
 263
 264                 sprintf(of_console_path, "%pOF", dp);
 265                 if (!strcmp(type, "serial")) {
 266                         strcat(of_console_path,
 267                                (skip ? ":b" : ":a"));
 268                 }
 269                 break;
 270
 271         default:
 272         case PROM_V2:
 273         case PROM_V3:
 274                 fd = *romvec->pv_v2bootargs.fd_stdout;
 275
 276                 spin_lock_irqsave(&prom_lock, flags);
 277                 node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
 278                 restore_current();
 279                 spin_unlock_irqrestore(&prom_lock, flags);
 280
 281                 if (!node) {
 282                         prom_printf("Cannot resolve stdout node from "
 283                                     "instance %08x.\n", fd);
 284                         prom_halt();
 285                 }
 286                 dp = of_find_node_by_phandle(node);
 287
 288                 if (!of_node_is_type(dp, "display") &&
 289                     !of_node_is_type(dp, "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                         sprintf(of_console_path, "%pOF", dp);
 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 }