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 } 338