arch/sparc/kernel/prom_32.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Procedures for creating, accessing and interpreting the device tree.
   4  *
   5  * Paul Mackerras       August 1996.
   6  * Copyright (C) 1996-2005 Paul Mackerras.
   7  *
   8  *  Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
   9  *    {engebret|bergner}@us.ibm.com
  10  *
  11  *  Adapted for sparc32 by David S. Miller davem@davemloft.net
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/types.h>
  16 #include <linux/string.h>
  17 #include <linux/mm.h>
  18 #include <linux/memblock.h>
  19
  20 #include <asm/prom.h>
  21 #include <asm/oplib.h>
  22 #include <asm/leon.h>
  23 #include <asm/leon_amba.h>
  24
  25 #include "prom.h"
  26
  27 void * __init prom_early_alloc(unsigned long size)
  28 {
  29         void *ret;
  30
  31         ret = memblock_alloc(size, SMP_CACHE_BYTES);
  32         if (!ret)
  33                 panic("%s: Failed to allocate %lu bytes\n", __func__, size);
  34
  35         prom_early_allocated += size;
  36
  37         return ret;
  38 }
  39
  40 /* The following routines deal with the black magic of fully naming a
  41  * node.
  42  *
  43  * Certain well known named nodes are just the simple name string.
  44  *
  45  * Actual devices have an address specifier appended to the base name
  46  * string, like this "foo@addr".  The "addr" can be in any number of
  47  * formats, and the platform plus the type of the node determine the
  48  * format and how it is constructed.
  49  *
  50  * For children of the ROOT node, the naming convention is fixed and
  51  * determined by whether this is a sun4u or sun4v system.
  52  *
  53  * For children of other nodes, it is bus type specific.  So
  54  * we walk up the tree until we discover a "device_type" property
  55  * we recognize and we go from there.
  56  */
  57 static void __init sparc32_path_component(struct device_node *dp, char *tmp_buf)
  58 {
  59         const char *name = of_get_property(dp, "name", NULL);
  60         struct linux_prom_registers *regs;
  61         struct property *rprop;
  62
  63         rprop = of_find_property(dp, "reg", NULL);
  64         if (!rprop)
  65                 return;
  66
  67         regs = rprop->value;
  68         sprintf(tmp_buf, "%s@%x,%x",
  69                 name,
  70                 regs->which_io, regs->phys_addr);
  71 }
  72
  73 /* "name@slot,offset"  */
  74 static void __init sbus_path_component(struct device_node *dp, char *tmp_buf)
  75 {
  76         const char *name = of_get_property(dp, "name", NULL);
  77         struct linux_prom_registers *regs;
  78         struct property *prop;
  79
  80         prop = of_find_property(dp, "reg", NULL);
  81         if (!prop)
  82                 return;
  83
  84         regs = prop->value;
  85         sprintf(tmp_buf, "%s@%x,%x",
  86                 name,
  87                 regs->which_io,
  88                 regs->phys_addr);
  89 }
  90
  91 /* "name@devnum[,func]" */
  92 static void __init pci_path_component(struct device_node *dp, char *tmp_buf)
  93 {
  94         const char *name = of_get_property(dp, "name", NULL);
  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                         name,
 108                         devfn >> 3,
 109                         devfn & 0x07);
 110         } else {
 111                 sprintf(tmp_buf, "%s@%x",
 112                         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         const char *name = of_get_property(dp, "name", NULL);
 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                 name,
 132                 regs->which_io, regs->phys_addr);
 133 }
 134
 135 /* "name@irq,addrlo" */
 136 static void __init ambapp_path_component(struct device_node *dp, char *tmp_buf)
 137 {
 138         const char *name = of_get_property(dp, "name", NULL);
 139         struct amba_prom_registers *regs;
 140         unsigned int *intr;
 141         unsigned int reg0;
 142         struct property *prop;
 143         int interrupt = 0;
 144
 145         /* In order to get a unique ID in the device tree (multiple AMBA devices
 146          * may have the same name) the node number is printed
 147          */
 148         prop = of_find_property(dp, "reg", NULL);
 149         if (!prop) {
 150                 reg0 = (unsigned int)dp->phandle;
 151         } else {
 152                 regs = prop->value;
 153                 reg0 = regs->phys_addr;
 154         }
 155
 156         /* Not all cores have Interrupt */
 157         prop = of_find_property(dp, "interrupts", NULL);
 158         if (!prop)
 159                 intr = &interrupt; /* IRQ0 does not exist */
 160         else
 161                 intr = prop->value;
 162
 163         sprintf(tmp_buf, "%s@%x,%x", name, *intr, reg0);
 164 }
 165
 166 static void __init __build_path_component(struct device_node *dp, char *tmp_buf)
 167 {
 168         struct device_node *parent = dp->parent;
 169
 170         if (parent != NULL) {
 171                 if (of_node_is_type(parent, "pci") ||
 172                     of_node_is_type(parent, "pciex"))
 173                         return pci_path_component(dp, tmp_buf);
 174                 if (of_node_is_type(parent, "sbus"))
 175                         return sbus_path_component(dp, tmp_buf);
 176                 if (of_node_is_type(parent, "ebus"))
 177                         return ebus_path_component(dp, tmp_buf);
 178                 if (of_node_is_type(parent, "ambapp"))
 179                         return ambapp_path_component(dp, tmp_buf);
 180
 181                 /* "isa" is handled with platform naming */
 182         }
 183
 184         /* Use platform naming convention.  */
 185         return sparc32_path_component(dp, tmp_buf);
 186 }
 187
 188 char * __init build_path_component(struct device_node *dp)
 189 {
 190         const char *name = of_get_property(dp, "name", NULL);
 191         char tmp_buf[64], *n;
 192
 193         tmp_buf[0] = '\0';
 194         __build_path_component(dp, tmp_buf);
 195         if (tmp_buf[0] == '\0')
 196                 strcpy(tmp_buf, name);
 197
 198         n = prom_early_alloc(strlen(tmp_buf) + 1);
 199         strcpy(n, tmp_buf);
 200
 201         return n;
 202 }
 203
 204 extern void restore_current(void);
 205
 206 void __init of_console_init(void)
 207 {
 208         char *msg = "OF stdout device is: %s\n";
 209         struct device_node *dp;
 210         unsigned long flags;
 211         const char *type;
 212         phandle node;
 213         int skip, tmp, fd;
 214
 215         of_console_path = prom_early_alloc(256);
 216
 217         switch (prom_vers) {
 218         case PROM_V0:
 219                 skip = 0;
 220                 switch (*romvec->pv_stdout) {
 221                 case PROMDEV_SCREEN:
 222                         type = "display";
 223                         break;
 224
 225                 case PROMDEV_TTYB:
 226                         skip = 1;
 227                         /* FALLTHRU */
 228
 229                 case PROMDEV_TTYA:
 230                         type = "serial";
 231                         break;
 232
 233                 default:
 234                         prom_printf("Invalid PROM_V0 stdout value %u\n",
 235                                     *romvec->pv_stdout);
 236                         prom_halt();
 237                 }
 238
 239                 tmp = skip;
 240                 for_each_node_by_type(dp, type) {
 241                         if (!tmp--)
 242                                 break;
 243                 }
 244                 if (!dp) {
 245                         prom_printf("Cannot find PROM_V0 console node.\n");
 246                         prom_halt();
 247                 }
 248                 of_console_device = dp;
 249
 250                 sprintf(of_console_path, "%pOF", dp);
 251                 if (!strcmp(type, "serial")) {
 252                         strcat(of_console_path,
 253                                (skip ? ":b" : ":a"));
 254                 }
 255                 break;
 256
 257         default:
 258         case PROM_V2:
 259         case PROM_V3:
 260                 fd = *romvec->pv_v2bootargs.fd_stdout;
 261
 262                 spin_lock_irqsave(&prom_lock, flags);
 263                 node = (*romvec->pv_v2devops.v2_inst2pkg)(fd);
 264                 restore_current();
 265                 spin_unlock_irqrestore(&prom_lock, flags);
 266
 267                 if (!node) {
 268                         prom_printf("Cannot resolve stdout node from "
 269                                     "instance %08x.\n", fd);
 270                         prom_halt();
 271                 }
 272                 dp = of_find_node_by_phandle(node);
 273
 274                 if (!of_node_is_type(dp, "display") &&
 275                     !of_node_is_type(dp, "serial")) {
 276                         prom_printf("Console device_type is neither display "
 277                                     "nor serial.\n");
 278                         prom_halt();
 279                 }
 280
 281                 of_console_device = dp;
 282
 283                 if (prom_vers == PROM_V2) {
 284                         sprintf(of_console_path, "%pOF", dp);
 285                         switch (*romvec->pv_stdout) {
 286                         case PROMDEV_TTYA:
 287                                 strcat(of_console_path, ":a");
 288                                 break;
 289                         case PROMDEV_TTYB:
 290                                 strcat(of_console_path, ":b");
 291                                 break;
 292                         }
 293                 } else {
 294                         const char *path;
 295
 296                         dp = of_find_node_by_path("/");
 297                         path = of_get_property(dp, "stdout-path", NULL);
 298                         if (!path) {
 299                                 prom_printf("No stdout-path in root node.\n");
 300                                 prom_halt();
 301                         }
 302                         strcpy(of_console_path, path);
 303                 }
 304                 break;
 305         }
 306
 307         of_console_options = strrchr(of_console_path, ':');
 308         if (of_console_options) {
 309                 of_console_options++;
 310                 if (*of_console_options == '\0')
 311                         of_console_options = NULL;
 312         }
 313
 314         printk(msg, of_console_path);
 315 }
 316
 317 void __init of_fill_in_cpu_data(void)
 318 {
 319 }
 320
 321 void __init irq_trans_init(struct device_node *dp)
 322 {
 323 }