vmxnet3: Disable napi in suspend, reenable in resume.
[linux-2.6.git] / drivers / of / fdt.c
1 /*
2  * Functions for working with the Flattened Device Tree data format
3  *
4  * Copyright 2009 Benjamin Herrenschmidt, IBM Corp
5  * benh@kernel.crashing.org
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * version 2 as published by the Free Software Foundation.
10  */
11
12 #include <linux/kernel.h>
13 #include <linux/initrd.h>
14 #include <linux/of.h>
15 #include <linux/of_fdt.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18
19 #ifdef CONFIG_PPC
20 #include <asm/machdep.h>
21 #endif /* CONFIG_PPC */
22
23 #include <asm/page.h>
24
25 int __initdata dt_root_addr_cells;
26 int __initdata dt_root_size_cells;
27
28 struct boot_param_header *initial_boot_params;
29
30 char *find_flat_dt_string(u32 offset)
31 {
32         return ((char *)initial_boot_params) +
33                 be32_to_cpu(initial_boot_params->off_dt_strings) + offset;
34 }
35
36 /**
37  * of_scan_flat_dt - scan flattened tree blob and call callback on each.
38  * @it: callback function
39  * @data: context data pointer
40  *
41  * This function is used to scan the flattened device-tree, it is
42  * used to extract the memory information at boot before we can
43  * unflatten the tree
44  */
45 int __init of_scan_flat_dt(int (*it)(unsigned long node,
46                                      const char *uname, int depth,
47                                      void *data),
48                            void *data)
49 {
50         unsigned long p = ((unsigned long)initial_boot_params) +
51                 be32_to_cpu(initial_boot_params->off_dt_struct);
52         int rc = 0;
53         int depth = -1;
54
55         do {
56                 u32 tag = be32_to_cpup((__be32 *)p);
57                 char *pathp;
58
59                 p += 4;
60                 if (tag == OF_DT_END_NODE) {
61                         depth--;
62                         continue;
63                 }
64                 if (tag == OF_DT_NOP)
65                         continue;
66                 if (tag == OF_DT_END)
67                         break;
68                 if (tag == OF_DT_PROP) {
69                         u32 sz = be32_to_cpup((__be32 *)p);
70                         p += 8;
71                         if (be32_to_cpu(initial_boot_params->version) < 0x10)
72                                 p = ALIGN(p, sz >= 8 ? 8 : 4);
73                         p += sz;
74                         p = ALIGN(p, 4);
75                         continue;
76                 }
77                 if (tag != OF_DT_BEGIN_NODE) {
78                         pr_err("Invalid tag %x in flat device tree!\n", tag);
79                         return -EINVAL;
80                 }
81                 depth++;
82                 pathp = (char *)p;
83                 p = ALIGN(p + strlen(pathp) + 1, 4);
84                 if ((*pathp) == '/') {
85                         char *lp, *np;
86                         for (lp = NULL, np = pathp; *np; np++)
87                                 if ((*np) == '/')
88                                         lp = np+1;
89                         if (lp != NULL)
90                                 pathp = lp;
91                 }
92                 rc = it(p, pathp, depth, data);
93                 if (rc != 0)
94                         break;
95         } while (1);
96
97         return rc;
98 }
99
100 /**
101  * of_get_flat_dt_root - find the root node in the flat blob
102  */
103 unsigned long __init of_get_flat_dt_root(void)
104 {
105         unsigned long p = ((unsigned long)initial_boot_params) +
106                 be32_to_cpu(initial_boot_params->off_dt_struct);
107
108         while (be32_to_cpup((__be32 *)p) == OF_DT_NOP)
109                 p += 4;
110         BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE);
111         p += 4;
112         return ALIGN(p + strlen((char *)p) + 1, 4);
113 }
114
115 /**
116  * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
117  *
118  * This function can be used within scan_flattened_dt callback to get
119  * access to properties
120  */
121 void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
122                                  unsigned long *size)
123 {
124         unsigned long p = node;
125
126         do {
127                 u32 tag = be32_to_cpup((__be32 *)p);
128                 u32 sz, noff;
129                 const char *nstr;
130
131                 p += 4;
132                 if (tag == OF_DT_NOP)
133                         continue;
134                 if (tag != OF_DT_PROP)
135                         return NULL;
136
137                 sz = be32_to_cpup((__be32 *)p);
138                 noff = be32_to_cpup((__be32 *)(p + 4));
139                 p += 8;
140                 if (be32_to_cpu(initial_boot_params->version) < 0x10)
141                         p = ALIGN(p, sz >= 8 ? 8 : 4);
142
143                 nstr = find_flat_dt_string(noff);
144                 if (nstr == NULL) {
145                         pr_warning("Can't find property index name !\n");
146                         return NULL;
147                 }
148                 if (strcmp(name, nstr) == 0) {
149                         if (size)
150                                 *size = sz;
151                         return (void *)p;
152                 }
153                 p += sz;
154                 p = ALIGN(p, 4);
155         } while (1);
156 }
157
158 /**
159  * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
160  * @node: node to test
161  * @compat: compatible string to compare with compatible list.
162  */
163 int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
164 {
165         const char *cp;
166         unsigned long cplen, l;
167
168         cp = of_get_flat_dt_prop(node, "compatible", &cplen);
169         if (cp == NULL)
170                 return 0;
171         while (cplen > 0) {
172                 if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
173                         return 1;
174                 l = strlen(cp) + 1;
175                 cp += l;
176                 cplen -= l;
177         }
178
179         return 0;
180 }
181
182 static void *__init unflatten_dt_alloc(unsigned long *mem, unsigned long size,
183                                        unsigned long align)
184 {
185         void *res;
186
187         *mem = ALIGN(*mem, align);
188         res = (void *)*mem;
189         *mem += size;
190
191         return res;
192 }
193
194 /**
195  * unflatten_dt_node - Alloc and populate a device_node from the flat tree
196  * @p: pointer to node in flat tree
197  * @dad: Parent struct device_node
198  * @allnextpp: pointer to ->allnext from last allocated device_node
199  * @fpsize: Size of the node path up at the current depth.
200  */
201 unsigned long __init unflatten_dt_node(unsigned long mem,
202                                         unsigned long *p,
203                                         struct device_node *dad,
204                                         struct device_node ***allnextpp,
205                                         unsigned long fpsize)
206 {
207         struct device_node *np;
208         struct property *pp, **prev_pp = NULL;
209         char *pathp;
210         u32 tag;
211         unsigned int l, allocl;
212         int has_name = 0;
213         int new_format = 0;
214
215         tag = be32_to_cpup((__be32 *)(*p));
216         if (tag != OF_DT_BEGIN_NODE) {
217                 pr_err("Weird tag at start of node: %x\n", tag);
218                 return mem;
219         }
220         *p += 4;
221         pathp = (char *)*p;
222         l = allocl = strlen(pathp) + 1;
223         *p = ALIGN(*p + l, 4);
224
225         /* version 0x10 has a more compact unit name here instead of the full
226          * path. we accumulate the full path size using "fpsize", we'll rebuild
227          * it later. We detect this because the first character of the name is
228          * not '/'.
229          */
230         if ((*pathp) != '/') {
231                 new_format = 1;
232                 if (fpsize == 0) {
233                         /* root node: special case. fpsize accounts for path
234                          * plus terminating zero. root node only has '/', so
235                          * fpsize should be 2, but we want to avoid the first
236                          * level nodes to have two '/' so we use fpsize 1 here
237                          */
238                         fpsize = 1;
239                         allocl = 2;
240                 } else {
241                         /* account for '/' and path size minus terminal 0
242                          * already in 'l'
243                          */
244                         fpsize += l;
245                         allocl = fpsize;
246                 }
247         }
248
249         np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
250                                 __alignof__(struct device_node));
251         if (allnextpp) {
252                 memset(np, 0, sizeof(*np));
253                 np->full_name = ((char *)np) + sizeof(struct device_node);
254                 if (new_format) {
255                         char *fn = np->full_name;
256                         /* rebuild full path for new format */
257                         if (dad && dad->parent) {
258                                 strcpy(fn, dad->full_name);
259 #ifdef DEBUG
260                                 if ((strlen(fn) + l + 1) != allocl) {
261                                         pr_debug("%s: p: %d, l: %d, a: %d\n",
262                                                 pathp, (int)strlen(fn),
263                                                 l, allocl);
264                                 }
265 #endif
266                                 fn += strlen(fn);
267                         }
268                         *(fn++) = '/';
269                         memcpy(fn, pathp, l);
270                 } else
271                         memcpy(np->full_name, pathp, l);
272                 prev_pp = &np->properties;
273                 **allnextpp = np;
274                 *allnextpp = &np->allnext;
275                 if (dad != NULL) {
276                         np->parent = dad;
277                         /* we temporarily use the next field as `last_child'*/
278                         if (dad->next == NULL)
279                                 dad->child = np;
280                         else
281                                 dad->next->sibling = np;
282                         dad->next = np;
283                 }
284                 kref_init(&np->kref);
285         }
286         while (1) {
287                 u32 sz, noff;
288                 char *pname;
289
290                 tag = be32_to_cpup((__be32 *)(*p));
291                 if (tag == OF_DT_NOP) {
292                         *p += 4;
293                         continue;
294                 }
295                 if (tag != OF_DT_PROP)
296                         break;
297                 *p += 4;
298                 sz = be32_to_cpup((__be32 *)(*p));
299                 noff = be32_to_cpup((__be32 *)((*p) + 4));
300                 *p += 8;
301                 if (be32_to_cpu(initial_boot_params->version) < 0x10)
302                         *p = ALIGN(*p, sz >= 8 ? 8 : 4);
303
304                 pname = find_flat_dt_string(noff);
305                 if (pname == NULL) {
306                         pr_info("Can't find property name in list !\n");
307                         break;
308                 }
309                 if (strcmp(pname, "name") == 0)
310                         has_name = 1;
311                 l = strlen(pname) + 1;
312                 pp = unflatten_dt_alloc(&mem, sizeof(struct property),
313                                         __alignof__(struct property));
314                 if (allnextpp) {
315                         /* We accept flattened tree phandles either in
316                          * ePAPR-style "phandle" properties, or the
317                          * legacy "linux,phandle" properties.  If both
318                          * appear and have different values, things
319                          * will get weird.  Don't do that. */
320                         if ((strcmp(pname, "phandle") == 0) ||
321                             (strcmp(pname, "linux,phandle") == 0)) {
322                                 if (np->phandle == 0)
323                                         np->phandle = be32_to_cpup((__be32*)*p);
324                         }
325                         /* And we process the "ibm,phandle" property
326                          * used in pSeries dynamic device tree
327                          * stuff */
328                         if (strcmp(pname, "ibm,phandle") == 0)
329                                 np->phandle = be32_to_cpup((__be32 *)*p);
330                         pp->name = pname;
331                         pp->length = sz;
332                         pp->value = (void *)*p;
333                         *prev_pp = pp;
334                         prev_pp = &pp->next;
335                 }
336                 *p = ALIGN((*p) + sz, 4);
337         }
338         /* with version 0x10 we may not have the name property, recreate
339          * it here from the unit name if absent
340          */
341         if (!has_name) {
342                 char *p1 = pathp, *ps = pathp, *pa = NULL;
343                 int sz;
344
345                 while (*p1) {
346                         if ((*p1) == '@')
347                                 pa = p1;
348                         if ((*p1) == '/')
349                                 ps = p1 + 1;
350                         p1++;
351                 }
352                 if (pa < ps)
353                         pa = p1;
354                 sz = (pa - ps) + 1;
355                 pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
356                                         __alignof__(struct property));
357                 if (allnextpp) {
358                         pp->name = "name";
359                         pp->length = sz;
360                         pp->value = pp + 1;
361                         *prev_pp = pp;
362                         prev_pp = &pp->next;
363                         memcpy(pp->value, ps, sz - 1);
364                         ((char *)pp->value)[sz - 1] = 0;
365                         pr_debug("fixed up name for %s -> %s\n", pathp,
366                                 (char *)pp->value);
367                 }
368         }
369         if (allnextpp) {
370                 *prev_pp = NULL;
371                 np->name = of_get_property(np, "name", NULL);
372                 np->type = of_get_property(np, "device_type", NULL);
373
374                 if (!np->name)
375                         np->name = "<NULL>";
376                 if (!np->type)
377                         np->type = "<NULL>";
378         }
379         while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
380                 if (tag == OF_DT_NOP)
381                         *p += 4;
382                 else
383                         mem = unflatten_dt_node(mem, p, np, allnextpp, fpsize);
384                 tag = be32_to_cpup((__be32 *)(*p));
385         }
386         if (tag != OF_DT_END_NODE) {
387                 pr_err("Weird tag at end of node: %x\n", tag);
388                 return mem;
389         }
390         *p += 4;
391         return mem;
392 }
393
394 #ifdef CONFIG_BLK_DEV_INITRD
395 /**
396  * early_init_dt_check_for_initrd - Decode initrd location from flat tree
397  * @node: reference to node containing initrd location ('chosen')
398  */
399 void __init early_init_dt_check_for_initrd(unsigned long node)
400 {
401         unsigned long start, end, len;
402         __be32 *prop;
403
404         pr_debug("Looking for initrd properties... ");
405
406         prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
407         if (!prop)
408                 return;
409         start = of_read_ulong(prop, len/4);
410
411         prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
412         if (!prop)
413                 return;
414         end = of_read_ulong(prop, len/4);
415
416         early_init_dt_setup_initrd_arch(start, end);
417         pr_debug("initrd_start=0x%lx  initrd_end=0x%lx\n", start, end);
418 }
419 #else
420 inline void early_init_dt_check_for_initrd(unsigned long node)
421 {
422 }
423 #endif /* CONFIG_BLK_DEV_INITRD */
424
425 /**
426  * early_init_dt_scan_root - fetch the top level address and size cells
427  */
428 int __init early_init_dt_scan_root(unsigned long node, const char *uname,
429                                    int depth, void *data)
430 {
431         __be32 *prop;
432
433         if (depth != 0)
434                 return 0;
435
436         dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
437         dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
438
439         prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
440         if (prop)
441                 dt_root_size_cells = be32_to_cpup(prop);
442         pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
443
444         prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
445         if (prop)
446                 dt_root_addr_cells = be32_to_cpup(prop);
447         pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
448
449         /* break now */
450         return 1;
451 }
452
453 u64 __init dt_mem_next_cell(int s, __be32 **cellp)
454 {
455         __be32 *p = *cellp;
456
457         *cellp = p + s;
458         return of_read_number(p, s);
459 }
460
461 /**
462  * early_init_dt_scan_memory - Look for an parse memory nodes
463  */
464 int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
465                                      int depth, void *data)
466 {
467         char *type = of_get_flat_dt_prop(node, "device_type", NULL);
468         __be32 *reg, *endp;
469         unsigned long l;
470
471         /* We are scanning "memory" nodes only */
472         if (type == NULL) {
473                 /*
474                  * The longtrail doesn't have a device_type on the
475                  * /memory node, so look for the node called /memory@0.
476                  */
477                 if (depth != 1 || strcmp(uname, "memory@0") != 0)
478                         return 0;
479         } else if (strcmp(type, "memory") != 0)
480                 return 0;
481
482         reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
483         if (reg == NULL)
484                 reg = of_get_flat_dt_prop(node, "reg", &l);
485         if (reg == NULL)
486                 return 0;
487
488         endp = reg + (l / sizeof(__be32));
489
490         pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
491             uname, l, reg[0], reg[1], reg[2], reg[3]);
492
493         while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
494                 u64 base, size;
495
496                 base = dt_mem_next_cell(dt_root_addr_cells, &reg);
497                 size = dt_mem_next_cell(dt_root_size_cells, &reg);
498
499                 if (size == 0)
500                         continue;
501                 pr_debug(" - %llx ,  %llx\n", (unsigned long long)base,
502                     (unsigned long long)size);
503
504                 early_init_dt_add_memory_arch(base, size);
505         }
506
507         return 0;
508 }
509
510 int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
511                                      int depth, void *data)
512 {
513         unsigned long l;
514         char *p;
515
516         pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
517
518         if (depth != 1 ||
519             (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
520                 return 0;
521
522         early_init_dt_check_for_initrd(node);
523
524         /* Retreive command line */
525         p = of_get_flat_dt_prop(node, "bootargs", &l);
526         if (p != NULL && l > 0)
527                 strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
528
529 #ifdef CONFIG_CMDLINE
530 #ifndef CONFIG_CMDLINE_FORCE
531         if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
532 #endif
533                 strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
534 #endif /* CONFIG_CMDLINE */
535
536         pr_debug("Command line is: %s\n", cmd_line);
537
538         /* break now */
539         return 1;
540 }
541
542 /**
543  * unflatten_device_tree - create tree of device_nodes from flat blob
544  *
545  * unflattens the device-tree passed by the firmware, creating the
546  * tree of struct device_node. It also fills the "name" and "type"
547  * pointers of the nodes so the normal device-tree walking functions
548  * can be used.
549  */
550 void __init unflatten_device_tree(void)
551 {
552         unsigned long start, mem, size;
553         struct device_node **allnextp = &allnodes;
554
555         pr_debug(" -> unflatten_device_tree()\n");
556
557         if (!initial_boot_params) {
558                 pr_debug("No device tree pointer\n");
559                 return;
560         }
561
562         pr_debug("Unflattening device tree:\n");
563         pr_debug("magic: %08x\n", be32_to_cpu(initial_boot_params->magic));
564         pr_debug("size: %08x\n", be32_to_cpu(initial_boot_params->totalsize));
565         pr_debug("version: %08x\n", be32_to_cpu(initial_boot_params->version));
566
567         if (be32_to_cpu(initial_boot_params->magic) != OF_DT_HEADER) {
568                 pr_err("Invalid device tree blob header\n");
569                 return;
570         }
571
572         /* First pass, scan for size */
573         start = ((unsigned long)initial_boot_params) +
574                 be32_to_cpu(initial_boot_params->off_dt_struct);
575         size = unflatten_dt_node(0, &start, NULL, NULL, 0);
576         size = (size | 3) + 1;
577
578         pr_debug("  size is %lx, allocating...\n", size);
579
580         /* Allocate memory for the expanded device tree */
581         mem = early_init_dt_alloc_memory_arch(size + 4,
582                         __alignof__(struct device_node));
583         mem = (unsigned long) __va(mem);
584
585         ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef);
586
587         pr_debug("  unflattening %lx...\n", mem);
588
589         /* Second pass, do actual unflattening */
590         start = ((unsigned long)initial_boot_params) +
591                 be32_to_cpu(initial_boot_params->off_dt_struct);
592         unflatten_dt_node(mem, &start, NULL, &allnextp, 0);
593         if (be32_to_cpup((__be32 *)start) != OF_DT_END)
594                 pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start));
595         if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef)
596                 pr_warning("End of tree marker overwritten: %08x\n",
597                            be32_to_cpu(((__be32 *)mem)[size / 4]));
598         *allnextp = NULL;
599
600         /* Get pointer to OF "/chosen" node for use everywhere */
601         of_chosen = of_find_node_by_path("/chosen");
602         if (of_chosen == NULL)
603                 of_chosen = of_find_node_by_path("/chosen@0");
604
605         pr_debug(" <- unflatten_device_tree()\n");
606 }