2 * Copyright (c) 2011 The Chromium OS Authors.
3 * SPDX-License-Identifier: GPL-2.0+
12 #include <linux/ctype.h>
16 DECLARE_GLOBAL_DATA_PTR;
19 * Here are the type we know about. One day we might allow drivers to
20 * register. For now we just put them here. The COMPAT macro allows us to
21 * turn this into a sparse list later, and keeps the ID with the name.
23 #define COMPAT(id, name) name
24 static const char * const compat_names[COMPAT_COUNT] = {
25 COMPAT(UNKNOWN, "<none>"),
26 COMPAT(NVIDIA_TEGRA20_USB, "nvidia,tegra20-ehci"),
27 COMPAT(NVIDIA_TEGRA30_USB, "nvidia,tegra30-ehci"),
28 COMPAT(NVIDIA_TEGRA114_USB, "nvidia,tegra114-ehci"),
29 COMPAT(NVIDIA_TEGRA114_I2C, "nvidia,tegra114-i2c"),
30 COMPAT(NVIDIA_TEGRA20_I2C, "nvidia,tegra20-i2c"),
31 COMPAT(NVIDIA_TEGRA20_DVC, "nvidia,tegra20-i2c-dvc"),
32 COMPAT(NVIDIA_TEGRA20_EMC, "nvidia,tegra20-emc"),
33 COMPAT(NVIDIA_TEGRA20_EMC_TABLE, "nvidia,tegra20-emc-table"),
34 COMPAT(NVIDIA_TEGRA20_KBC, "nvidia,tegra20-kbc"),
35 COMPAT(NVIDIA_TEGRA20_NAND, "nvidia,tegra20-nand"),
36 COMPAT(NVIDIA_TEGRA20_PWM, "nvidia,tegra20-pwm"),
37 COMPAT(NVIDIA_TEGRA20_DC, "nvidia,tegra20-dc"),
38 COMPAT(NVIDIA_TEGRA124_SDMMC, "nvidia,tegra124-sdhci"),
39 COMPAT(NVIDIA_TEGRA30_SDMMC, "nvidia,tegra30-sdhci"),
40 COMPAT(NVIDIA_TEGRA20_SDMMC, "nvidia,tegra20-sdhci"),
41 COMPAT(NVIDIA_TEGRA20_SFLASH, "nvidia,tegra20-sflash"),
42 COMPAT(NVIDIA_TEGRA20_SLINK, "nvidia,tegra20-slink"),
43 COMPAT(NVIDIA_TEGRA114_SPI, "nvidia,tegra114-spi"),
44 COMPAT(SMSC_LAN9215, "smsc,lan9215"),
45 COMPAT(SAMSUNG_EXYNOS5_SROMC, "samsung,exynos-sromc"),
46 COMPAT(SAMSUNG_S3C2440_I2C, "samsung,s3c2440-i2c"),
47 COMPAT(SAMSUNG_EXYNOS5_SOUND, "samsung,exynos-sound"),
48 COMPAT(WOLFSON_WM8994_CODEC, "wolfson,wm8994-codec"),
49 COMPAT(SAMSUNG_EXYNOS_SPI, "samsung,exynos-spi"),
50 COMPAT(GOOGLE_CROS_EC, "google,cros-ec"),
51 COMPAT(GOOGLE_CROS_EC_KEYB, "google,cros-ec-keyb"),
52 COMPAT(SAMSUNG_EXYNOS_EHCI, "samsung,exynos-ehci"),
53 COMPAT(SAMSUNG_EXYNOS5_XHCI, "samsung,exynos5250-xhci"),
54 COMPAT(SAMSUNG_EXYNOS_USB_PHY, "samsung,exynos-usb-phy"),
55 COMPAT(SAMSUNG_EXYNOS5_USB3_PHY, "samsung,exynos5250-usb3-phy"),
56 COMPAT(SAMSUNG_EXYNOS_TMU, "samsung,exynos-tmu"),
57 COMPAT(SAMSUNG_EXYNOS_FIMD, "samsung,exynos-fimd"),
58 COMPAT(SAMSUNG_EXYNOS_MIPI_DSI, "samsung,exynos-mipi-dsi"),
59 COMPAT(SAMSUNG_EXYNOS5_DP, "samsung,exynos5-dp"),
60 COMPAT(SAMSUNG_EXYNOS_DWMMC, "samsung,exynos-dwmmc"),
61 COMPAT(SAMSUNG_EXYNOS_MMC, "samsung,exynos-mmc"),
62 COMPAT(SAMSUNG_EXYNOS_SERIAL, "samsung,exynos4210-uart"),
63 COMPAT(MAXIM_MAX77686_PMIC, "maxim,max77686_pmic"),
64 COMPAT(GENERIC_SPI_FLASH, "spi-flash"),
65 COMPAT(MAXIM_98095_CODEC, "maxim,max98095-codec"),
66 COMPAT(INFINEON_SLB9635_TPM, "infineon,slb9635-tpm"),
67 COMPAT(INFINEON_SLB9645_TPM, "infineon,slb9645-tpm"),
68 COMPAT(SAMSUNG_EXYNOS5_I2C, "samsung,exynos5-hsi2c"),
69 COMPAT(SANDBOX_HOST_EMULATION, "sandbox,host-emulation"),
70 COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"),
71 COMPAT(TI_TPS65090, "ti,tps65090"),
72 COMPAT(COMPAT_NXP_PTN3460, "nxp,ptn3460"),
73 COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"),
74 COMPAT(PARADE_PS8625, "parade,ps8625"),
75 COMPAT(COMPAT_INTEL_LPC, "intel,lpc"),
78 const char *fdtdec_get_compatible(enum fdt_compat_id id)
80 /* We allow reading of the 'unknown' ID for testing purposes */
81 assert(id >= 0 && id < COMPAT_COUNT);
82 return compat_names[id];
85 fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
86 const char *prop_name, fdt_size_t *sizep)
88 const fdt_addr_t *cell;
91 debug("%s: %s: ", __func__, prop_name);
92 cell = fdt_getprop(blob, node, prop_name, &len);
93 if (cell && ((!sizep && len == sizeof(fdt_addr_t)) ||
94 len == sizeof(fdt_addr_t) * 2)) {
95 fdt_addr_t addr = fdt_addr_to_cpu(*cell);
97 const fdt_size_t *size;
99 size = (fdt_size_t *)((char *)cell +
101 *sizep = fdt_size_to_cpu(*size);
102 debug("addr=%08lx, size=%08x\n",
103 (ulong)addr, *sizep);
105 debug("%08lx\n", (ulong)addr);
109 debug("(not found)\n");
110 return FDT_ADDR_T_NONE;
113 fdt_addr_t fdtdec_get_addr(const void *blob, int node,
114 const char *prop_name)
116 return fdtdec_get_addr_size(blob, node, prop_name, NULL);
119 uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
120 uint64_t default_val)
122 const uint64_t *cell64;
125 cell64 = fdt_getprop(blob, node, prop_name, &length);
126 if (!cell64 || length < sizeof(*cell64))
129 return fdt64_to_cpu(*cell64);
132 int fdtdec_get_is_enabled(const void *blob, int node)
137 * It should say "okay", so only allow that. Some fdts use "ok" but
138 * this is a bug. Please fix your device tree source file. See here
141 * http://www.mail-archive.com/u-boot@lists.denx.de/msg71598.html
143 cell = fdt_getprop(blob, node, "status", NULL);
145 return 0 == strcmp(cell, "okay");
149 enum fdt_compat_id fdtdec_lookup(const void *blob, int node)
151 enum fdt_compat_id id;
153 /* Search our drivers */
154 for (id = COMPAT_UNKNOWN; id < COMPAT_COUNT; id++)
155 if (0 == fdt_node_check_compatible(blob, node,
158 return COMPAT_UNKNOWN;
161 int fdtdec_next_compatible(const void *blob, int node,
162 enum fdt_compat_id id)
164 return fdt_node_offset_by_compatible(blob, node, compat_names[id]);
167 int fdtdec_next_compatible_subnode(const void *blob, int node,
168 enum fdt_compat_id id, int *depthp)
171 node = fdt_next_node(blob, node, depthp);
172 } while (*depthp > 1);
174 /* If this is a direct subnode, and compatible, return it */
175 if (*depthp == 1 && 0 == fdt_node_check_compatible(
176 blob, node, compat_names[id]))
179 return -FDT_ERR_NOTFOUND;
182 int fdtdec_next_alias(const void *blob, const char *name,
183 enum fdt_compat_id id, int *upto)
185 #define MAX_STR_LEN 20
186 char str[MAX_STR_LEN + 20];
189 /* snprintf() is not available */
190 assert(strlen(name) < MAX_STR_LEN);
191 sprintf(str, "%.*s%d", MAX_STR_LEN, name, *upto);
192 node = fdt_path_offset(blob, str);
195 err = fdt_node_check_compatible(blob, node, compat_names[id]);
199 return -FDT_ERR_NOTFOUND;
204 int fdtdec_find_aliases_for_id(const void *blob, const char *name,
205 enum fdt_compat_id id, int *node_list, int maxcount)
207 memset(node_list, '\0', sizeof(*node_list) * maxcount);
209 return fdtdec_add_aliases_for_id(blob, name, id, node_list, maxcount);
212 /* TODO: Can we tighten this code up a little? */
213 int fdtdec_add_aliases_for_id(const void *blob, const char *name,
214 enum fdt_compat_id id, int *node_list, int maxcount)
216 int name_len = strlen(name);
224 /* find the alias node if present */
225 alias_node = fdt_path_offset(blob, "/aliases");
228 * start with nothing, and we can assume that the root node can't
231 memset(nodes, '\0', sizeof(nodes));
233 /* First find all the compatible nodes */
234 for (node = count = 0; node >= 0 && count < maxcount;) {
235 node = fdtdec_next_compatible(blob, node, id);
237 nodes[count++] = node;
240 debug("%s: warning: maxcount exceeded with alias '%s'\n",
243 /* Now find all the aliases */
244 for (offset = fdt_first_property_offset(blob, alias_node);
246 offset = fdt_next_property_offset(blob, offset)) {
247 const struct fdt_property *prop;
253 prop = fdt_get_property_by_offset(blob, offset, NULL);
254 path = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
255 if (prop->len && 0 == strncmp(path, name, name_len))
256 node = fdt_path_offset(blob, prop->data);
260 /* Get the alias number */
261 number = simple_strtoul(path + name_len, NULL, 10);
262 if (number < 0 || number >= maxcount) {
263 debug("%s: warning: alias '%s' is out of range\n",
268 /* Make sure the node we found is actually in our list! */
270 for (j = 0; j < count; j++)
271 if (nodes[j] == node) {
277 debug("%s: warning: alias '%s' points to a node "
278 "'%s' that is missing or is not compatible "
279 " with '%s'\n", __func__, path,
280 fdt_get_name(blob, node, NULL),
286 * Add this node to our list in the right place, and mark
289 if (fdtdec_get_is_enabled(blob, node)) {
290 if (node_list[number]) {
291 debug("%s: warning: alias '%s' requires that "
292 "a node be placed in the list in a "
293 "position which is already filled by "
294 "node '%s'\n", __func__, path,
295 fdt_get_name(blob, node, NULL));
298 node_list[number] = node;
299 if (number >= num_found)
300 num_found = number + 1;
305 /* Add any nodes not mentioned by an alias */
306 for (i = j = 0; i < maxcount; i++) {
308 for (; j < maxcount; j++)
310 fdtdec_get_is_enabled(blob, nodes[j]))
313 /* Have we run out of nodes to add? */
317 assert(!node_list[i]);
318 node_list[i] = nodes[j++];
327 int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
330 int base_len = strlen(base);
331 const char *find_name;
336 find_name = fdt_get_name(blob, offset, &find_namelen);
337 debug("Looking for '%s' at %d, name %s\n", base, offset, find_name);
339 aliases = fdt_path_offset(blob, "/aliases");
340 for (prop_offset = fdt_first_property_offset(blob, aliases);
342 prop_offset = fdt_next_property_offset(blob, prop_offset)) {
349 prop = fdt_getprop_by_offset(blob, prop_offset, &name, &len);
350 debug(" - %s, %s\n", name, prop);
351 if (len < find_namelen || *prop != '/' || prop[len - 1] ||
352 strncmp(name, base, base_len))
355 slash = strrchr(prop, '/');
356 if (strcmp(slash + 1, find_name))
358 for (p = name; *p; p++) {
360 *seqp = simple_strtoul(p, NULL, 10);
361 debug("Found seq %d\n", *seqp);
367 debug("Not found\n");
371 int fdtdec_get_alias_node(const void *blob, const char *name)
378 return -FDT_ERR_NOTFOUND;
379 alias_node = fdt_path_offset(blob, "/aliases");
380 prop = fdt_getprop(blob, alias_node, name, &len);
382 return -FDT_ERR_NOTFOUND;
383 return fdt_path_offset(blob, prop);
386 int fdtdec_get_chosen_node(const void *blob, const char *name)
393 return -FDT_ERR_NOTFOUND;
394 chosen_node = fdt_path_offset(blob, "/chosen");
395 prop = fdt_getprop(blob, chosen_node, name, &len);
397 return -FDT_ERR_NOTFOUND;
398 return fdt_path_offset(blob, prop);
401 int fdtdec_check_fdt(void)
404 * We must have an FDT, but we cannot panic() yet since the console
405 * is not ready. So for now, just assert(). Boards which need an early
406 * FDT (prior to console ready) will need to make their own
407 * arrangements and do their own checks.
409 assert(!fdtdec_prepare_fdt());
414 * This function is a little odd in that it accesses global data. At some
415 * point if the architecture board.c files merge this will make more sense.
416 * Even now, it is common code.
418 int fdtdec_prepare_fdt(void)
420 if (!gd->fdt_blob || ((uintptr_t)gd->fdt_blob & 3) ||
421 fdt_check_header(gd->fdt_blob)) {
422 printf("No valid FDT found - please append one to U-Boot "
423 "binary, use u-boot-dtb.bin or define "
424 "CONFIG_OF_EMBED. For sandbox, use -d <file.dtb>\n");
430 int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name)
435 debug("%s: %s\n", __func__, prop_name);
436 phandle = fdt_getprop(blob, node, prop_name, NULL);
438 return -FDT_ERR_NOTFOUND;
440 lookup = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*phandle));
445 * Look up a property in a node and check that it has a minimum length.
447 * @param blob FDT blob
448 * @param node node to examine
449 * @param prop_name name of property to find
450 * @param min_len minimum property length in bytes
451 * @param err 0 if ok, or -FDT_ERR_NOTFOUND if the property is not
452 found, or -FDT_ERR_BADLAYOUT if not enough data
453 * @return pointer to cell, which is only valid if err == 0
455 static const void *get_prop_check_min_len(const void *blob, int node,
456 const char *prop_name, int min_len, int *err)
461 debug("%s: %s\n", __func__, prop_name);
462 cell = fdt_getprop(blob, node, prop_name, &len);
464 *err = -FDT_ERR_NOTFOUND;
465 else if (len < min_len)
466 *err = -FDT_ERR_BADLAYOUT;
472 int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
473 u32 *array, int count)
478 debug("%s: %s\n", __func__, prop_name);
479 cell = get_prop_check_min_len(blob, node, prop_name,
480 sizeof(u32) * count, &err);
482 for (i = 0; i < count; i++)
483 array[i] = fdt32_to_cpu(cell[i]);
488 const u32 *fdtdec_locate_array(const void *blob, int node,
489 const char *prop_name, int count)
494 cell = get_prop_check_min_len(blob, node, prop_name,
495 sizeof(u32) * count, &err);
496 return err ? NULL : cell;
499 int fdtdec_get_bool(const void *blob, int node, const char *prop_name)
504 debug("%s: %s\n", __func__, prop_name);
505 cell = fdt_getprop(blob, node, prop_name, &len);
510 * Decode a list of GPIOs from an FDT. This creates a list of GPIOs with no
513 * @param blob FDT blob to use
514 * @param node Node to look at
515 * @param prop_name Node property name
516 * @param gpio Array of gpio elements to fill from FDT. This will be
517 * untouched if either 0 or an error is returned
518 * @param max_count Maximum number of elements allowed
519 * @return number of GPIOs read if ok, -FDT_ERR_BADLAYOUT if max_count would
520 * be exceeded, or -FDT_ERR_NOTFOUND if the property is missing.
522 int fdtdec_decode_gpios(const void *blob, int node, const char *prop_name,
523 struct fdt_gpio_state *gpio, int max_count)
525 const struct fdt_property *prop;
530 debug("%s: %s\n", __func__, prop_name);
531 assert(max_count > 0);
532 prop = fdt_get_property(blob, node, prop_name, &len);
534 debug("%s: property '%s' missing\n", __func__, prop_name);
535 return -FDT_ERR_NOTFOUND;
538 /* We will use the name to tag the GPIO */
539 name = fdt_string(blob, fdt32_to_cpu(prop->nameoff));
540 cell = (u32 *)prop->data;
541 len /= sizeof(u32) * 3; /* 3 cells per GPIO record */
542 if (len > max_count) {
543 debug(" %s: too many GPIOs / cells for "
544 "property '%s'\n", __func__, prop_name);
545 return -FDT_ERR_BADLAYOUT;
548 /* Read out the GPIO data from the cells */
549 for (i = 0; i < len; i++, cell += 3) {
550 gpio[i].gpio = fdt32_to_cpu(cell[1]);
551 gpio[i].flags = fdt32_to_cpu(cell[2]);
558 int fdtdec_decode_gpio(const void *blob, int node, const char *prop_name,
559 struct fdt_gpio_state *gpio)
563 debug("%s: %s\n", __func__, prop_name);
564 gpio->gpio = FDT_GPIO_NONE;
566 err = fdtdec_decode_gpios(blob, node, prop_name, gpio, 1);
567 return err == 1 ? 0 : err;
570 int fdtdec_get_gpio(struct fdt_gpio_state *gpio)
574 if (!fdt_gpio_isvalid(gpio))
577 val = gpio_get_value(gpio->gpio);
578 return gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
581 int fdtdec_set_gpio(struct fdt_gpio_state *gpio, int val)
583 if (!fdt_gpio_isvalid(gpio))
586 val = gpio->flags & FDT_GPIO_ACTIVE_LOW ? val ^ 1 : val;
587 return gpio_set_value(gpio->gpio, val);
590 int fdtdec_setup_gpio(struct fdt_gpio_state *gpio)
593 * Return success if there is no GPIO defined. This is used for
596 if (!fdt_gpio_isvalid(gpio))
599 if (gpio_request(gpio->gpio, gpio->name))
604 int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
605 u8 *array, int count)
610 cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
612 memcpy(array, cell, count);
616 const u8 *fdtdec_locate_byte_array(const void *blob, int node,
617 const char *prop_name, int count)
622 cell = get_prop_check_min_len(blob, node, prop_name, count, &err);
628 int fdtdec_get_config_int(const void *blob, const char *prop_name,
633 debug("%s: %s\n", __func__, prop_name);
634 config_node = fdt_path_offset(blob, "/config");
637 return fdtdec_get_int(blob, config_node, prop_name, default_val);
640 int fdtdec_get_config_bool(const void *blob, const char *prop_name)
645 debug("%s: %s\n", __func__, prop_name);
646 config_node = fdt_path_offset(blob, "/config");
649 prop = fdt_get_property(blob, config_node, prop_name, NULL);
654 char *fdtdec_get_config_string(const void *blob, const char *prop_name)
660 debug("%s: %s\n", __func__, prop_name);
661 nodeoffset = fdt_path_offset(blob, "/config");
665 nodep = fdt_getprop(blob, nodeoffset, prop_name, &len);
669 return (char *)nodep;
672 int fdtdec_decode_region(const void *blob, int node,
673 const char *prop_name, void **ptrp, size_t *size)
675 const fdt_addr_t *cell;
678 debug("%s: %s\n", __func__, prop_name);
679 cell = fdt_getprop(blob, node, prop_name, &len);
680 if (!cell || (len != sizeof(fdt_addr_t) * 2))
683 *ptrp = map_sysmem(fdt_addr_to_cpu(*cell), *size);
684 *size = fdt_size_to_cpu(cell[1]);
685 debug("%s: size=%zx\n", __func__, *size);
690 * Read a flash entry from the fdt
692 * @param blob FDT blob
693 * @param node Offset of node to read
694 * @param name Name of node being read
695 * @param entry Place to put offset and size of this node
696 * @return 0 if ok, -ve on error
698 int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
699 struct fmap_entry *entry)
703 if (fdtdec_get_int_array(blob, node, "reg", reg, 2)) {
704 debug("Node '%s' has bad/missing 'reg' property\n", name);
705 return -FDT_ERR_NOTFOUND;
707 entry->offset = reg[0];
708 entry->length = reg[1];
713 static u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells)
718 number = (number << 32) | fdt32_to_cpu(*ptr++);
723 int fdt_get_resource(const void *fdt, int node, const char *property,
724 unsigned int index, struct fdt_resource *res)
726 const fdt32_t *ptr, *end;
727 int na, ns, len, parent;
730 parent = fdt_parent_offset(fdt, node);
734 na = fdt_address_cells(fdt, parent);
735 ns = fdt_size_cells(fdt, parent);
737 ptr = fdt_getprop(fdt, node, property, &len);
741 end = ptr + len / sizeof(*ptr);
743 while (ptr + na + ns <= end) {
745 res->start = res->end = fdtdec_get_number(ptr, na);
746 res->end += fdtdec_get_number(&ptr[na], ns) - 1;
754 return -FDT_ERR_NOTFOUND;
757 int fdt_get_named_resource(const void *fdt, int node, const char *property,
758 const char *prop_names, const char *name,
759 struct fdt_resource *res)
763 index = fdt_find_string(fdt, node, prop_names, name);
767 return fdt_get_resource(fdt, node, property, index, res);
770 int fdtdec_pci_get_bdf(const void *fdt, int node, int *bdf)
775 prop = fdt_getprop(fdt, node, "reg", &len);
779 *bdf = fdt32_to_cpu(*prop) & 0xffffff;