Root/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/module.h>
15#include <linux/of.h>
16#include <linux/of_fdt.h>
17#include <linux/string.h>
18#include <linux/errno.h>
19#include <linux/slab.h>
20
21#include <asm/setup.h> /* for COMMAND_LINE_SIZE */
22#ifdef CONFIG_PPC
23#include <asm/machdep.h>
24#endif /* CONFIG_PPC */
25
26#include <asm/page.h>
27
28char *of_fdt_get_string(struct boot_param_header *blob, u32 offset)
29{
30    return ((char *)blob) +
31        be32_to_cpu(blob->off_dt_strings) + offset;
32}
33
34/**
35 * of_fdt_get_property - Given a node in the given flat blob, return
36 * the property ptr
37 */
38void *of_fdt_get_property(struct boot_param_header *blob,
39               unsigned long node, const char *name,
40               unsigned long *size)
41{
42    unsigned long p = node;
43
44    do {
45        u32 tag = be32_to_cpup((__be32 *)p);
46        u32 sz, noff;
47        const char *nstr;
48
49        p += 4;
50        if (tag == OF_DT_NOP)
51            continue;
52        if (tag != OF_DT_PROP)
53            return NULL;
54
55        sz = be32_to_cpup((__be32 *)p);
56        noff = be32_to_cpup((__be32 *)(p + 4));
57        p += 8;
58        if (be32_to_cpu(blob->version) < 0x10)
59            p = ALIGN(p, sz >= 8 ? 8 : 4);
60
61        nstr = of_fdt_get_string(blob, noff);
62        if (nstr == NULL) {
63            pr_warning("Can't find property index name !\n");
64            return NULL;
65        }
66        if (strcmp(name, nstr) == 0) {
67            if (size)
68                *size = sz;
69            return (void *)p;
70        }
71        p += sz;
72        p = ALIGN(p, 4);
73    } while (1);
74}
75
76/**
77 * of_fdt_is_compatible - Return true if given node from the given blob has
78 * compat in its compatible list
79 * @blob: A device tree blob
80 * @node: node to test
81 * @compat: compatible string to compare with compatible list.
82 *
83 * On match, returns a non-zero value with smaller values returned for more
84 * specific compatible values.
85 */
86int of_fdt_is_compatible(struct boot_param_header *blob,
87              unsigned long node, const char *compat)
88{
89    const char *cp;
90    unsigned long cplen, l, score = 0;
91
92    cp = of_fdt_get_property(blob, node, "compatible", &cplen);
93    if (cp == NULL)
94        return 0;
95    while (cplen > 0) {
96        score++;
97        if (of_compat_cmp(cp, compat, strlen(compat)) == 0)
98            return score;
99        l = strlen(cp) + 1;
100        cp += l;
101        cplen -= l;
102    }
103
104    return 0;
105}
106
107/**
108 * of_fdt_match - Return true if node matches a list of compatible values
109 */
110int of_fdt_match(struct boot_param_header *blob, unsigned long node,
111                 const char *const *compat)
112{
113    unsigned int tmp, score = 0;
114
115    if (!compat)
116        return 0;
117
118    while (*compat) {
119        tmp = of_fdt_is_compatible(blob, node, *compat);
120        if (tmp && (score == 0 || (tmp < score)))
121            score = tmp;
122        compat++;
123    }
124
125    return score;
126}
127
128static void *unflatten_dt_alloc(unsigned long *mem, unsigned long size,
129                       unsigned long align)
130{
131    void *res;
132
133    *mem = ALIGN(*mem, align);
134    res = (void *)*mem;
135    *mem += size;
136
137    return res;
138}
139
140/**
141 * unflatten_dt_node - Alloc and populate a device_node from the flat tree
142 * @blob: The parent device tree blob
143 * @mem: Memory chunk to use for allocating device nodes and properties
144 * @p: pointer to node in flat tree
145 * @dad: Parent struct device_node
146 * @allnextpp: pointer to ->allnext from last allocated device_node
147 * @fpsize: Size of the node path up at the current depth.
148 */
149static unsigned long unflatten_dt_node(struct boot_param_header *blob,
150                unsigned long mem,
151                unsigned long *p,
152                struct device_node *dad,
153                struct device_node ***allnextpp,
154                unsigned long fpsize)
155{
156    struct device_node *np;
157    struct property *pp, **prev_pp = NULL;
158    char *pathp;
159    u32 tag;
160    unsigned int l, allocl;
161    int has_name = 0;
162    int new_format = 0;
163
164    tag = be32_to_cpup((__be32 *)(*p));
165    if (tag != OF_DT_BEGIN_NODE) {
166        pr_err("Weird tag at start of node: %x\n", tag);
167        return mem;
168    }
169    *p += 4;
170    pathp = (char *)*p;
171    l = allocl = strlen(pathp) + 1;
172    *p = ALIGN(*p + l, 4);
173
174    /* version 0x10 has a more compact unit name here instead of the full
175     * path. we accumulate the full path size using "fpsize", we'll rebuild
176     * it later. We detect this because the first character of the name is
177     * not '/'.
178     */
179    if ((*pathp) != '/') {
180        new_format = 1;
181        if (fpsize == 0) {
182            /* root node: special case. fpsize accounts for path
183             * plus terminating zero. root node only has '/', so
184             * fpsize should be 2, but we want to avoid the first
185             * level nodes to have two '/' so we use fpsize 1 here
186             */
187            fpsize = 1;
188            allocl = 2;
189        } else {
190            /* account for '/' and path size minus terminal 0
191             * already in 'l'
192             */
193            fpsize += l;
194            allocl = fpsize;
195        }
196    }
197
198    np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl,
199                __alignof__(struct device_node));
200    if (allnextpp) {
201        memset(np, 0, sizeof(*np));
202        np->full_name = ((char *)np) + sizeof(struct device_node);
203        if (new_format) {
204            char *fn = np->full_name;
205            /* rebuild full path for new format */
206            if (dad && dad->parent) {
207                strcpy(fn, dad->full_name);
208#ifdef DEBUG
209                if ((strlen(fn) + l + 1) != allocl) {
210                    pr_debug("%s: p: %d, l: %d, a: %d\n",
211                        pathp, (int)strlen(fn),
212                        l, allocl);
213                }
214#endif
215                fn += strlen(fn);
216            }
217            *(fn++) = '/';
218            memcpy(fn, pathp, l);
219        } else
220            memcpy(np->full_name, pathp, l);
221        prev_pp = &np->properties;
222        **allnextpp = np;
223        *allnextpp = &np->allnext;
224        if (dad != NULL) {
225            np->parent = dad;
226            /* we temporarily use the next field as `last_child'*/
227            if (dad->next == NULL)
228                dad->child = np;
229            else
230                dad->next->sibling = np;
231            dad->next = np;
232        }
233        kref_init(&np->kref);
234    }
235    /* process properties */
236    while (1) {
237        u32 sz, noff;
238        char *pname;
239
240        tag = be32_to_cpup((__be32 *)(*p));
241        if (tag == OF_DT_NOP) {
242            *p += 4;
243            continue;
244        }
245        if (tag != OF_DT_PROP)
246            break;
247        *p += 4;
248        sz = be32_to_cpup((__be32 *)(*p));
249        noff = be32_to_cpup((__be32 *)((*p) + 4));
250        *p += 8;
251        if (be32_to_cpu(blob->version) < 0x10)
252            *p = ALIGN(*p, sz >= 8 ? 8 : 4);
253
254        pname = of_fdt_get_string(blob, noff);
255        if (pname == NULL) {
256            pr_info("Can't find property name in list !\n");
257            break;
258        }
259        if (strcmp(pname, "name") == 0)
260            has_name = 1;
261        l = strlen(pname) + 1;
262        pp = unflatten_dt_alloc(&mem, sizeof(struct property),
263                    __alignof__(struct property));
264        if (allnextpp) {
265            /* We accept flattened tree phandles either in
266             * ePAPR-style "phandle" properties, or the
267             * legacy "linux,phandle" properties. If both
268             * appear and have different values, things
269             * will get weird. Don't do that. */
270            if ((strcmp(pname, "phandle") == 0) ||
271                (strcmp(pname, "linux,phandle") == 0)) {
272                if (np->phandle == 0)
273                    np->phandle = be32_to_cpup((__be32*)*p);
274            }
275            /* And we process the "ibm,phandle" property
276             * used in pSeries dynamic device tree
277             * stuff */
278            if (strcmp(pname, "ibm,phandle") == 0)
279                np->phandle = be32_to_cpup((__be32 *)*p);
280            pp->name = pname;
281            pp->length = sz;
282            pp->value = (void *)*p;
283            *prev_pp = pp;
284            prev_pp = &pp->next;
285        }
286        *p = ALIGN((*p) + sz, 4);
287    }
288    /* with version 0x10 we may not have the name property, recreate
289     * it here from the unit name if absent
290     */
291    if (!has_name) {
292        char *p1 = pathp, *ps = pathp, *pa = NULL;
293        int sz;
294
295        while (*p1) {
296            if ((*p1) == '@')
297                pa = p1;
298            if ((*p1) == '/')
299                ps = p1 + 1;
300            p1++;
301        }
302        if (pa < ps)
303            pa = p1;
304        sz = (pa - ps) + 1;
305        pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz,
306                    __alignof__(struct property));
307        if (allnextpp) {
308            pp->name = "name";
309            pp->length = sz;
310            pp->value = pp + 1;
311            *prev_pp = pp;
312            prev_pp = &pp->next;
313            memcpy(pp->value, ps, sz - 1);
314            ((char *)pp->value)[sz - 1] = 0;
315            pr_debug("fixed up name for %s -> %s\n", pathp,
316                (char *)pp->value);
317        }
318    }
319    if (allnextpp) {
320        *prev_pp = NULL;
321        np->name = of_get_property(np, "name", NULL);
322        np->type = of_get_property(np, "device_type", NULL);
323
324        if (!np->name)
325            np->name = "<NULL>";
326        if (!np->type)
327            np->type = "<NULL>";
328    }
329    while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
330        if (tag == OF_DT_NOP)
331            *p += 4;
332        else
333            mem = unflatten_dt_node(blob, mem, p, np, allnextpp,
334                        fpsize);
335        tag = be32_to_cpup((__be32 *)(*p));
336    }
337    if (tag != OF_DT_END_NODE) {
338        pr_err("Weird tag at end of node: %x\n", tag);
339        return mem;
340    }
341    *p += 4;
342    return mem;
343}
344
345/**
346 * __unflatten_device_tree - create tree of device_nodes from flat blob
347 *
348 * unflattens a device-tree, creating the
349 * tree of struct device_node. It also fills the "name" and "type"
350 * pointers of the nodes so the normal device-tree walking functions
351 * can be used.
352 * @blob: The blob to expand
353 * @mynodes: The device_node tree created by the call
354 * @dt_alloc: An allocator that provides a virtual address to memory
355 * for the resulting tree
356 */
357static void __unflatten_device_tree(struct boot_param_header *blob,
358                 struct device_node **mynodes,
359                 void * (*dt_alloc)(u64 size, u64 align))
360{
361    unsigned long start, mem, size;
362    struct device_node **allnextp = mynodes;
363
364    pr_debug(" -> unflatten_device_tree()\n");
365
366    if (!blob) {
367        pr_debug("No device tree pointer\n");
368        return;
369    }
370
371    pr_debug("Unflattening device tree:\n");
372    pr_debug("magic: %08x\n", be32_to_cpu(blob->magic));
373    pr_debug("size: %08x\n", be32_to_cpu(blob->totalsize));
374    pr_debug("version: %08x\n", be32_to_cpu(blob->version));
375
376    if (be32_to_cpu(blob->magic) != OF_DT_HEADER) {
377        pr_err("Invalid device tree blob header\n");
378        return;
379    }
380
381    /* First pass, scan for size */
382    start = ((unsigned long)blob) +
383        be32_to_cpu(blob->off_dt_struct);
384    size = unflatten_dt_node(blob, 0, &start, NULL, NULL, 0);
385    size = (size | 3) + 1;
386
387    pr_debug(" size is %lx, allocating...\n", size);
388
389    /* Allocate memory for the expanded device tree */
390    mem = (unsigned long)
391        dt_alloc(size + 4, __alignof__(struct device_node));
392
393    ((__be32 *)mem)[size / 4] = cpu_to_be32(0xdeadbeef);
394
395    pr_debug(" unflattening %lx...\n", mem);
396
397    /* Second pass, do actual unflattening */
398    start = ((unsigned long)blob) +
399        be32_to_cpu(blob->off_dt_struct);
400    unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0);
401    if (be32_to_cpup((__be32 *)start) != OF_DT_END)
402        pr_warning("Weird tag at end of tree: %08x\n", *((u32 *)start));
403    if (be32_to_cpu(((__be32 *)mem)[size / 4]) != 0xdeadbeef)
404        pr_warning("End of tree marker overwritten: %08x\n",
405               be32_to_cpu(((__be32 *)mem)[size / 4]));
406    *allnextp = NULL;
407
408    pr_debug(" <- unflatten_device_tree()\n");
409}
410
411static void *kernel_tree_alloc(u64 size, u64 align)
412{
413    return kzalloc(size, GFP_KERNEL);
414}
415
416/**
417 * of_fdt_unflatten_tree - create tree of device_nodes from flat blob
418 *
419 * unflattens the device-tree passed by the firmware, creating the
420 * tree of struct device_node. It also fills the "name" and "type"
421 * pointers of the nodes so the normal device-tree walking functions
422 * can be used.
423 */
424void of_fdt_unflatten_tree(unsigned long *blob,
425            struct device_node **mynodes)
426{
427    struct boot_param_header *device_tree =
428        (struct boot_param_header *)blob;
429    __unflatten_device_tree(device_tree, mynodes, &kernel_tree_alloc);
430}
431EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree);
432
433/* Everything below here references initial_boot_params directly. */
434int __initdata dt_root_addr_cells;
435int __initdata dt_root_size_cells;
436
437struct boot_param_header *initial_boot_params;
438
439#ifdef CONFIG_OF_EARLY_FLATTREE
440
441/**
442 * of_scan_flat_dt - scan flattened tree blob and call callback on each.
443 * @it: callback function
444 * @data: context data pointer
445 *
446 * This function is used to scan the flattened device-tree, it is
447 * used to extract the memory information at boot before we can
448 * unflatten the tree
449 */
450int __init of_scan_flat_dt(int (*it)(unsigned long node,
451                     const char *uname, int depth,
452                     void *data),
453               void *data)
454{
455    unsigned long p = ((unsigned long)initial_boot_params) +
456        be32_to_cpu(initial_boot_params->off_dt_struct);
457    int rc = 0;
458    int depth = -1;
459
460    do {
461        u32 tag = be32_to_cpup((__be32 *)p);
462        char *pathp;
463
464        p += 4;
465        if (tag == OF_DT_END_NODE) {
466            depth--;
467            continue;
468        }
469        if (tag == OF_DT_NOP)
470            continue;
471        if (tag == OF_DT_END)
472            break;
473        if (tag == OF_DT_PROP) {
474            u32 sz = be32_to_cpup((__be32 *)p);
475            p += 8;
476            if (be32_to_cpu(initial_boot_params->version) < 0x10)
477                p = ALIGN(p, sz >= 8 ? 8 : 4);
478            p += sz;
479            p = ALIGN(p, 4);
480            continue;
481        }
482        if (tag != OF_DT_BEGIN_NODE) {
483            pr_err("Invalid tag %x in flat device tree!\n", tag);
484            return -EINVAL;
485        }
486        depth++;
487        pathp = (char *)p;
488        p = ALIGN(p + strlen(pathp) + 1, 4);
489        if ((*pathp) == '/') {
490            char *lp, *np;
491            for (lp = NULL, np = pathp; *np; np++)
492                if ((*np) == '/')
493                    lp = np+1;
494            if (lp != NULL)
495                pathp = lp;
496        }
497        rc = it(p, pathp, depth, data);
498        if (rc != 0)
499            break;
500    } while (1);
501
502    return rc;
503}
504
505/**
506 * of_get_flat_dt_root - find the root node in the flat blob
507 */
508unsigned long __init of_get_flat_dt_root(void)
509{
510    unsigned long p = ((unsigned long)initial_boot_params) +
511        be32_to_cpu(initial_boot_params->off_dt_struct);
512
513    while (be32_to_cpup((__be32 *)p) == OF_DT_NOP)
514        p += 4;
515    BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE);
516    p += 4;
517    return ALIGN(p + strlen((char *)p) + 1, 4);
518}
519
520/**
521 * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr
522 *
523 * This function can be used within scan_flattened_dt callback to get
524 * access to properties
525 */
526void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
527                 unsigned long *size)
528{
529    return of_fdt_get_property(initial_boot_params, node, name, size);
530}
531
532/**
533 * of_flat_dt_is_compatible - Return true if given node has compat in compatible list
534 * @node: node to test
535 * @compat: compatible string to compare with compatible list.
536 */
537int __init of_flat_dt_is_compatible(unsigned long node, const char *compat)
538{
539    return of_fdt_is_compatible(initial_boot_params, node, compat);
540}
541
542/**
543 * of_flat_dt_match - Return true if node matches a list of compatible values
544 */
545int __init of_flat_dt_match(unsigned long node, const char *const *compat)
546{
547    return of_fdt_match(initial_boot_params, node, compat);
548}
549
550#ifdef CONFIG_BLK_DEV_INITRD
551/**
552 * early_init_dt_check_for_initrd - Decode initrd location from flat tree
553 * @node: reference to node containing initrd location ('chosen')
554 */
555void __init early_init_dt_check_for_initrd(unsigned long node)
556{
557    unsigned long start, end, len;
558    __be32 *prop;
559
560    pr_debug("Looking for initrd properties... ");
561
562    prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);
563    if (!prop)
564        return;
565    start = of_read_ulong(prop, len/4);
566
567    prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);
568    if (!prop)
569        return;
570    end = of_read_ulong(prop, len/4);
571
572    early_init_dt_setup_initrd_arch(start, end);
573    pr_debug("initrd_start=0x%lx initrd_end=0x%lx\n", start, end);
574}
575#else
576inline void early_init_dt_check_for_initrd(unsigned long node)
577{
578}
579#endif /* CONFIG_BLK_DEV_INITRD */
580
581/**
582 * early_init_dt_scan_root - fetch the top level address and size cells
583 */
584int __init early_init_dt_scan_root(unsigned long node, const char *uname,
585                   int depth, void *data)
586{
587    __be32 *prop;
588
589    if (depth != 0)
590        return 0;
591
592    dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
593    dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
594
595    prop = of_get_flat_dt_prop(node, "#size-cells", NULL);
596    if (prop)
597        dt_root_size_cells = be32_to_cpup(prop);
598    pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells);
599
600    prop = of_get_flat_dt_prop(node, "#address-cells", NULL);
601    if (prop)
602        dt_root_addr_cells = be32_to_cpup(prop);
603    pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells);
604
605    /* break now */
606    return 1;
607}
608
609u64 __init dt_mem_next_cell(int s, __be32 **cellp)
610{
611    __be32 *p = *cellp;
612
613    *cellp = p + s;
614    return of_read_number(p, s);
615}
616
617/**
618 * early_init_dt_scan_memory - Look for an parse memory nodes
619 */
620int __init early_init_dt_scan_memory(unsigned long node, const char *uname,
621                     int depth, void *data)
622{
623    char *type = of_get_flat_dt_prop(node, "device_type", NULL);
624    __be32 *reg, *endp;
625    unsigned long l;
626
627    /* We are scanning "memory" nodes only */
628    if (type == NULL) {
629        /*
630         * The longtrail doesn't have a device_type on the
631         * /memory node, so look for the node called /memory@0.
632         */
633        if (depth != 1 || strcmp(uname, "memory@0") != 0)
634            return 0;
635    } else if (strcmp(type, "memory") != 0)
636        return 0;
637
638    reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l);
639    if (reg == NULL)
640        reg = of_get_flat_dt_prop(node, "reg", &l);
641    if (reg == NULL)
642        return 0;
643
644    endp = reg + (l / sizeof(__be32));
645
646    pr_debug("memory scan node %s, reg size %ld, data: %x %x %x %x,\n",
647        uname, l, reg[0], reg[1], reg[2], reg[3]);
648
649    while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) {
650        u64 base, size;
651
652        base = dt_mem_next_cell(dt_root_addr_cells, &reg);
653        size = dt_mem_next_cell(dt_root_size_cells, &reg);
654
655        if (size == 0)
656            continue;
657        pr_debug(" - %llx , %llx\n", (unsigned long long)base,
658            (unsigned long long)size);
659
660        early_init_dt_add_memory_arch(base, size);
661    }
662
663    return 0;
664}
665
666int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
667                     int depth, void *data)
668{
669    unsigned long l;
670    char *p;
671
672    pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
673
674    if (depth != 1 || !data ||
675        (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
676        return 0;
677
678    early_init_dt_check_for_initrd(node);
679
680    /* Retrieve command line */
681    p = of_get_flat_dt_prop(node, "bootargs", &l);
682    if (p != NULL && l > 0)
683        strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE));
684
685    /*
686     * CONFIG_CMDLINE is meant to be a default in case nothing else
687     * managed to set the command line, unless CONFIG_CMDLINE_FORCE
688     * is set in which case we override whatever was found earlier.
689     */
690#ifdef CONFIG_CMDLINE
691#ifndef CONFIG_CMDLINE_FORCE
692    if (!((char *)data)[0])
693#endif
694        strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
695#endif /* CONFIG_CMDLINE */
696
697    pr_debug("Command line is: %s\n", (char*)data);
698
699    /* break now */
700    return 1;
701}
702
703/**
704 * unflatten_device_tree - create tree of device_nodes from flat blob
705 *
706 * unflattens the device-tree passed by the firmware, creating the
707 * tree of struct device_node. It also fills the "name" and "type"
708 * pointers of the nodes so the normal device-tree walking functions
709 * can be used.
710 */
711void __init unflatten_device_tree(void)
712{
713    __unflatten_device_tree(initial_boot_params, &allnodes,
714                early_init_dt_alloc_memory_arch);
715
716    /* Get pointer to "/chosen" and "/aliasas" nodes for use everywhere */
717    of_alias_scan(early_init_dt_alloc_memory_arch);
718}
719
720#endif /* CONFIG_OF_EARLY_FLATTREE */
721

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