diff options
Diffstat (limited to 'drivers/of/fdt.c')
| -rw-r--r-- | drivers/of/fdt.c | 1145 |
1 files changed, 1145 insertions, 0 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c new file mode 100644 index 000000000..cde35c5d0 --- /dev/null +++ b/drivers/of/fdt.c @@ -0,0 +1,1145 @@ +/* + * Functions for working with the Flattened Device Tree data format + * + * Copyright 2009 Benjamin Herrenschmidt, IBM Corp + * benh@kernel.crashing.org + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + */ + +#include <linux/crc32.h> +#include <linux/kernel.h> +#include <linux/initrd.h> +#include <linux/memblock.h> +#include <linux/of.h> +#include <linux/of_fdt.h> +#include <linux/of_reserved_mem.h> +#include <linux/sizes.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/libfdt.h> +#include <linux/debugfs.h> +#include <linux/serial_core.h> +#include <linux/sysfs.h> + +#include <asm/setup.h> /* for COMMAND_LINE_SIZE */ +#include <asm/page.h> + +/* + * of_fdt_limit_memory - limit the number of regions in the /memory node + * @limit: maximum entries + * + * Adjust the flattened device tree to have at most 'limit' number of + * memory entries in the /memory node. This function may be called + * any time after initial_boot_param is set. + */ +void of_fdt_limit_memory(int limit) +{ + int memory; + int len; + const void *val; + int nr_address_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; + int nr_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; + const uint32_t *addr_prop; + const uint32_t *size_prop; + int root_offset; + int cell_size; + + root_offset = fdt_path_offset(initial_boot_params, "/"); + if (root_offset < 0) + return; + + addr_prop = fdt_getprop(initial_boot_params, root_offset, + "#address-cells", NULL); + if (addr_prop) + nr_address_cells = fdt32_to_cpu(*addr_prop); + + size_prop = fdt_getprop(initial_boot_params, root_offset, + "#size-cells", NULL); + if (size_prop) + nr_size_cells = fdt32_to_cpu(*size_prop); + + cell_size = sizeof(uint32_t)*(nr_address_cells + nr_size_cells); + + memory = fdt_path_offset(initial_boot_params, "/memory"); + if (memory > 0) { + val = fdt_getprop(initial_boot_params, memory, "reg", &len); + if (len > limit*cell_size) { + len = limit*cell_size; + pr_debug("Limiting number of entries to %d\n", limit); + fdt_setprop(initial_boot_params, memory, "reg", val, + len); + } + } +} + +/** + * of_fdt_is_compatible - Return true if given node from the given blob has + * compat in its compatible list + * @blob: A device tree blob + * @node: node to test + * @compat: compatible string to compare with compatible list. + * + * On match, returns a non-zero value with smaller values returned for more + * specific compatible values. + */ +int of_fdt_is_compatible(const void *blob, + unsigned long node, const char *compat) +{ + const char *cp; + int cplen; + unsigned long l, score = 0; + + cp = fdt_getprop(blob, node, "compatible", &cplen); + if (cp == NULL) + return 0; + while (cplen > 0) { + score++; + if (of_compat_cmp(cp, compat, strlen(compat)) == 0) + return score; + l = strlen(cp) + 1; + cp += l; + cplen -= l; + } + + return 0; +} + +/** + * of_fdt_is_big_endian - Return true if given node needs BE MMIO accesses + * @blob: A device tree blob + * @node: node to test + * + * Returns true if the node has a "big-endian" property, or if the kernel + * was compiled for BE *and* the node has a "native-endian" property. + * Returns false otherwise. + */ +bool of_fdt_is_big_endian(const void *blob, unsigned long node) +{ + if (fdt_getprop(blob, node, "big-endian", NULL)) + return true; + if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && + fdt_getprop(blob, node, "native-endian", NULL)) + return true; + return false; +} + +/** + * of_fdt_match - Return true if node matches a list of compatible values + */ +int of_fdt_match(const void *blob, unsigned long node, + const char *const *compat) +{ + unsigned int tmp, score = 0; + + if (!compat) + return 0; + + while (*compat) { + tmp = of_fdt_is_compatible(blob, node, *compat); + if (tmp && (score == 0 || (tmp < score))) + score = tmp; + compat++; + } + + return score; +} + +static void *unflatten_dt_alloc(void **mem, unsigned long size, + unsigned long align) +{ + void *res; + + *mem = PTR_ALIGN(*mem, align); + res = *mem; + *mem += size; + + return res; +} + +/** + * unflatten_dt_node - Alloc and populate a device_node from the flat tree + * @blob: The parent device tree blob + * @mem: Memory chunk to use for allocating device nodes and properties + * @p: pointer to node in flat tree + * @dad: Parent struct device_node + * @fpsize: Size of the node path up at the current depth. + */ +static void * unflatten_dt_node(void *blob, + void *mem, + int *poffset, + struct device_node *dad, + struct device_node **nodepp, + unsigned long fpsize, + bool dryrun) +{ + const __be32 *p; + struct device_node *np; + struct property *pp, **prev_pp = NULL; + const char *pathp; + unsigned int l, allocl; + static int depth = 0; + int old_depth; + int offset; + int has_name = 0; + int new_format = 0; + + pathp = fdt_get_name(blob, *poffset, &l); + if (!pathp) + return mem; + + allocl = ++l; + + /* version 0x10 has a more compact unit name here instead of the full + * path. we accumulate the full path size using "fpsize", we'll rebuild + * it later. We detect this because the first character of the name is + * not '/'. + */ + if ((*pathp) != '/') { + new_format = 1; + if (fpsize == 0) { + /* root node: special case. fpsize accounts for path + * plus terminating zero. root node only has '/', so + * fpsize should be 2, but we want to avoid the first + * level nodes to have two '/' so we use fpsize 1 here + */ + fpsize = 1; + allocl = 2; + l = 1; + pathp = ""; + } else { + /* account for '/' and path size minus terminal 0 + * already in 'l' + */ + fpsize += l; + allocl = fpsize; + } + } + + np = unflatten_dt_alloc(&mem, sizeof(struct device_node) + allocl, + __alignof__(struct device_node)); + if (!dryrun) { + char *fn; + of_node_init(np); + np->full_name = fn = ((char *)np) + sizeof(*np); + if (new_format) { + /* rebuild full path for new format */ + if (dad && dad->parent) { + strcpy(fn, dad->full_name); +#ifdef DEBUG + if ((strlen(fn) + l + 1) != allocl) { + pr_debug("%s: p: %d, l: %d, a: %d\n", + pathp, (int)strlen(fn), + l, allocl); + } +#endif + fn += strlen(fn); + } + *(fn++) = '/'; + } + memcpy(fn, pathp, l); + + prev_pp = &np->properties; + if (dad != NULL) { + np->parent = dad; + np->sibling = dad->child; + dad->child = np; + } + } + /* process properties */ + for (offset = fdt_first_property_offset(blob, *poffset); + (offset >= 0); + (offset = fdt_next_property_offset(blob, offset))) { + const char *pname; + u32 sz; + + if (!(p = fdt_getprop_by_offset(blob, offset, &pname, &sz))) { + offset = -FDT_ERR_INTERNAL; + break; + } + + if (pname == NULL) { + pr_info("Can't find property name in list !\n"); + break; + } + if (strcmp(pname, "name") == 0) + has_name = 1; + pp = unflatten_dt_alloc(&mem, sizeof(struct property), + __alignof__(struct property)); + if (!dryrun) { + /* We accept flattened tree phandles either in + * ePAPR-style "phandle" properties, or the + * legacy "linux,phandle" properties. If both + * appear and have different values, things + * will get weird. Don't do that. */ + if ((strcmp(pname, "phandle") == 0) || + (strcmp(pname, "linux,phandle") == 0)) { + if (np->phandle == 0) + np->phandle = be32_to_cpup(p); + } + /* And we process the "ibm,phandle" property + * used in pSeries dynamic device tree + * stuff */ + if (strcmp(pname, "ibm,phandle") == 0) + np->phandle = be32_to_cpup(p); + pp->name = (char *)pname; + pp->length = sz; + pp->value = (__be32 *)p; + *prev_pp = pp; + prev_pp = &pp->next; + } + } + /* with version 0x10 we may not have the name property, recreate + * it here from the unit name if absent + */ + if (!has_name) { + const char *p1 = pathp, *ps = pathp, *pa = NULL; + int sz; + + while (*p1) { + if ((*p1) == '@') + pa = p1; + if ((*p1) == '/') + ps = p1 + 1; + p1++; + } + if (pa < ps) + pa = p1; + sz = (pa - ps) + 1; + pp = unflatten_dt_alloc(&mem, sizeof(struct property) + sz, + __alignof__(struct property)); + if (!dryrun) { + pp->name = "name"; + pp->length = sz; + pp->value = pp + 1; + *prev_pp = pp; + prev_pp = &pp->next; + memcpy(pp->value, ps, sz - 1); + ((char *)pp->value)[sz - 1] = 0; + pr_debug("fixed up name for %s -> %s\n", pathp, + (char *)pp->value); + } + } + if (!dryrun) { + *prev_pp = NULL; + np->name = of_get_property(np, "name", NULL); + np->type = of_get_property(np, "device_type", NULL); + + if (!np->name) + np->name = "<NULL>"; + if (!np->type) + np->type = "<NULL>"; + } + + old_depth = depth; + *poffset = fdt_next_node(blob, *poffset, &depth); + if (depth < 0) + depth = 0; + while (*poffset > 0 && depth > old_depth) + mem = unflatten_dt_node(blob, mem, poffset, np, NULL, + fpsize, dryrun); + + if (*poffset < 0 && *poffset != -FDT_ERR_NOTFOUND) + pr_err("unflatten: error %d processing FDT\n", *poffset); + + /* + * Reverse the child list. Some drivers assumes node order matches .dts + * node order + */ + if (!dryrun && np->child) { + struct device_node *child = np->child; + np->child = NULL; + while (child) { + struct device_node *next = child->sibling; + child->sibling = np->child; + np->child = child; + child = next; + } + } + + if (nodepp) + *nodepp = np; + + return mem; +} + +/** + * __unflatten_device_tree - create tree of device_nodes from flat blob + * + * unflattens a device-tree, creating the + * tree of struct device_node. It also fills the "name" and "type" + * pointers of the nodes so the normal device-tree walking functions + * can be used. + * @blob: The blob to expand + * @mynodes: The device_node tree created by the call + * @dt_alloc: An allocator that provides a virtual address to memory + * for the resulting tree + */ +static void __unflatten_device_tree(void *blob, + struct device_node **mynodes, + void * (*dt_alloc)(u64 size, u64 align)) +{ + unsigned long size; + int start; + void *mem; + + pr_debug(" -> unflatten_device_tree()\n"); + + if (!blob) { + pr_debug("No device tree pointer\n"); + return; + } + + pr_debug("Unflattening device tree:\n"); + pr_debug("magic: %08x\n", fdt_magic(blob)); + pr_debug("size: %08x\n", fdt_totalsize(blob)); + pr_debug("version: %08x\n", fdt_version(blob)); + + if (fdt_check_header(blob)) { + pr_err("Invalid device tree blob header\n"); + return; + } + + /* First pass, scan for size */ + start = 0; + size = (unsigned long)unflatten_dt_node(blob, NULL, &start, NULL, NULL, 0, true); + size = ALIGN(size, 4); + + pr_debug(" size is %lx, allocating...\n", size); + + /* Allocate memory for the expanded device tree */ + mem = dt_alloc(size + 4, __alignof__(struct device_node)); + memset(mem, 0, size); + + *(__be32 *)(mem + size) = cpu_to_be32(0xdeadbeef); + + pr_debug(" unflattening %p...\n", mem); + + /* Second pass, do actual unflattening */ + start = 0; + unflatten_dt_node(blob, mem, &start, NULL, mynodes, 0, false); + if (be32_to_cpup(mem + size) != 0xdeadbeef) + pr_warning("End of tree marker overwritten: %08x\n", + be32_to_cpup(mem + size)); + + pr_debug(" <- unflatten_device_tree()\n"); +} + +static void *kernel_tree_alloc(u64 size, u64 align) +{ + return kzalloc(size, GFP_KERNEL); +} + +/** + * of_fdt_unflatten_tree - create tree of device_nodes from flat blob + * + * unflattens the device-tree passed by the firmware, creating the + * tree of struct device_node. It also fills the "name" and "type" + * pointers of the nodes so the normal device-tree walking functions + * can be used. + */ +void of_fdt_unflatten_tree(unsigned long *blob, + struct device_node **mynodes) +{ + __unflatten_device_tree(blob, mynodes, &kernel_tree_alloc); +} +EXPORT_SYMBOL_GPL(of_fdt_unflatten_tree); + +/* Everything below here references initial_boot_params directly. */ +int __initdata dt_root_addr_cells; +int __initdata dt_root_size_cells; + +void *initial_boot_params; + +#ifdef CONFIG_OF_EARLY_FLATTREE + +static u32 of_fdt_crc32; + +/** + * res_mem_reserve_reg() - reserve all memory described in 'reg' property + */ +static int __init __reserved_mem_reserve_reg(unsigned long node, + const char *uname) +{ + int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32); + phys_addr_t base, size; + int len; + const __be32 *prop; + int nomap, first = 1; + + prop = of_get_flat_dt_prop(node, "reg", &len); + if (!prop) + return -ENOENT; + + if (len && len % t_len != 0) { + pr_err("Reserved memory: invalid reg property in '%s', skipping node.\n", + uname); + return -EINVAL; + } + + nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; + + while (len >= t_len) { + base = dt_mem_next_cell(dt_root_addr_cells, &prop); + size = dt_mem_next_cell(dt_root_size_cells, &prop); + + if (size && + early_init_dt_reserve_memory_arch(base, size, nomap) == 0) + pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %ld MiB\n", + uname, &base, (unsigned long)size / SZ_1M); + else + pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %ld MiB\n", + uname, &base, (unsigned long)size / SZ_1M); + + len -= t_len; + if (first) { + fdt_reserved_mem_save_node(node, uname, base, size); + first = 0; + } + } + return 0; +} + +/** + * __reserved_mem_check_root() - check if #size-cells, #address-cells provided + * in /reserved-memory matches the values supported by the current implementation, + * also check if ranges property has been provided + */ +static int __init __reserved_mem_check_root(unsigned long node) +{ + const __be32 *prop; + + prop = of_get_flat_dt_prop(node, "#size-cells", NULL); + if (!prop || be32_to_cpup(prop) != dt_root_size_cells) + return -EINVAL; + + prop = of_get_flat_dt_prop(node, "#address-cells", NULL); + if (!prop || be32_to_cpup(prop) != dt_root_addr_cells) + return -EINVAL; + + prop = of_get_flat_dt_prop(node, "ranges", NULL); + if (!prop) + return -EINVAL; + return 0; +} + +/** + * fdt_scan_reserved_mem() - scan a single FDT node for reserved memory + */ +static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname, + int depth, void *data) +{ + static int found; + const char *status; + int err; + + if (!found && depth == 1 && strcmp(uname, "reserved-memory") == 0) { + if (__reserved_mem_check_root(node) != 0) { + pr_err("Reserved memory: unsupported node format, ignoring\n"); + /* break scan */ + return 1; + } + found = 1; + /* scan next node */ + return 0; + } else if (!found) { + /* scan next node */ + return 0; + } else if (found && depth < 2) { + /* scanning of /reserved-memory has been finished */ + return 1; + } + + status = of_get_flat_dt_prop(node, "status", NULL); + if (status && strcmp(status, "okay") != 0 && strcmp(status, "ok") != 0) + return 0; + + err = __reserved_mem_reserve_reg(node, uname); + if (err == -ENOENT && of_get_flat_dt_prop(node, "size", NULL)) + fdt_reserved_mem_save_node(node, uname, 0, 0); + + /* scan next node */ + return 0; +} + +/** + * early_init_fdt_scan_reserved_mem() - create reserved memory regions + * + * This function grabs memory from early allocator for device exclusive use + * defined in device tree structures. It should be called by arch specific code + * once the early allocator (i.e. memblock) has been fully activated. + */ +void __init early_init_fdt_scan_reserved_mem(void) +{ + int n; + u64 base, size; + + if (!initial_boot_params) + return; + + /* Reserve the dtb region */ + early_init_dt_reserve_memory_arch(__pa(initial_boot_params), + fdt_totalsize(initial_boot_params), + 0); + + /* Process header /memreserve/ fields */ + for (n = 0; ; n++) { + fdt_get_mem_rsv(initial_boot_params, n, &base, &size); + if (!size) + break; + early_init_dt_reserve_memory_arch(base, size, 0); + } + + of_scan_flat_dt(__fdt_scan_reserved_mem, NULL); + fdt_init_reserved_mem(); +} + +/** + * of_scan_flat_dt - scan flattened tree blob and call callback on each. + * @it: callback function + * @data: context data pointer + * + * This function is used to scan the flattened device-tree, it is + * used to extract the memory information at boot before we can + * unflatten the tree + */ +int __init of_scan_flat_dt(int (*it)(unsigned long node, + const char *uname, int depth, + void *data), + void *data) +{ + const void *blob = initial_boot_params; + const char *pathp; + int offset, rc = 0, depth = -1; + + for (offset = fdt_next_node(blob, -1, &depth); + offset >= 0 && depth >= 0 && !rc; + offset = fdt_next_node(blob, offset, &depth)) { + + pathp = fdt_get_name(blob, offset, NULL); + if (*pathp == '/') + pathp = kbasename(pathp); + rc = it(offset, pathp, depth, data); + } + return rc; +} + +/** + * of_get_flat_dt_root - find the root node in the flat blob + */ +unsigned long __init of_get_flat_dt_root(void) +{ + return 0; +} + +/** + * of_get_flat_dt_size - Return the total size of the FDT + */ +int __init of_get_flat_dt_size(void) +{ + return fdt_totalsize(initial_boot_params); +} + +/** + * of_get_flat_dt_prop - Given a node in the flat blob, return the property ptr + * + * This function can be used within scan_flattened_dt callback to get + * access to properties + */ +const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, + int *size) +{ + return fdt_getprop(initial_boot_params, node, name, size); +} + +/** + * of_flat_dt_is_compatible - Return true if given node has compat in compatible list + * @node: node to test + * @compat: compatible string to compare with compatible list. + */ +int __init of_flat_dt_is_compatible(unsigned long node, const char *compat) +{ + return of_fdt_is_compatible(initial_boot_params, node, compat); +} + +/** + * of_flat_dt_match - Return true if node matches a list of compatible values + */ +int __init of_flat_dt_match(unsigned long node, const char *const *compat) +{ + return of_fdt_match(initial_boot_params, node, compat); +} + +struct fdt_scan_status { + const char *name; + int namelen; + int depth; + int found; + int (*iterator)(unsigned long node, const char *uname, int depth, void *data); + void *data; +}; + +const char * __init of_flat_dt_get_machine_name(void) +{ + const char *name; + unsigned long dt_root = of_get_flat_dt_root(); + + name = of_get_flat_dt_prop(dt_root, "model", NULL); + if (!name) + name = of_get_flat_dt_prop(dt_root, "compatible", NULL); + return name; +} + +/** + * of_flat_dt_match_machine - Iterate match tables to find matching machine. + * + * @default_match: A machine specific ptr to return in case of no match. + * @get_next_compat: callback function to return next compatible match table. + * + * Iterate through machine match tables to find the best match for the machine + * compatible string in the FDT. + */ +const void * __init of_flat_dt_match_machine(const void *default_match, + const void * (*get_next_compat)(const char * const**)) +{ + const void *data = NULL; + const void *best_data = default_match; + const char *const *compat; + unsigned long dt_root; + unsigned int best_score = ~1, score = 0; + + dt_root = of_get_flat_dt_root(); + while ((data = get_next_compat(&compat))) { + score = of_flat_dt_match(dt_root, compat); + if (score > 0 && score < best_score) { + best_data = data; + best_score = score; + } + } + if (!best_data) { + const char *prop; + int size; + + pr_err("\n unrecognized device tree list:\n[ "); + + prop = of_get_flat_dt_prop(dt_root, "compatible", &size); + if (prop) { + while (size > 0) { + printk("'%s' ", prop); + size -= strlen(prop) + 1; + prop += strlen(prop) + 1; + } + } + printk("]\n\n"); + return NULL; + } + + pr_info("Machine model: %s\n", of_flat_dt_get_machine_name()); + + return best_data; +} + +#ifdef CONFIG_BLK_DEV_INITRD +/** + * early_init_dt_check_for_initrd - Decode initrd location from flat tree + * @node: reference to node containing initrd location ('chosen') + */ +static void __init early_init_dt_check_for_initrd(unsigned long node) +{ + u64 start, end; + int len; + const __be32 *prop; + + pr_debug("Looking for initrd properties... "); + + prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len); + if (!prop) + return; + start = of_read_number(prop, len/4); + + prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len); + if (!prop) + return; + end = of_read_number(prop, len/4); + + initrd_start = (unsigned long)__va(start); + initrd_end = (unsigned long)__va(end); + initrd_below_start_ok = 1; + + pr_debug("initrd_start=0x%llx initrd_end=0x%llx\n", + (unsigned long long)start, (unsigned long long)end); +} +#else +static inline void early_init_dt_check_for_initrd(unsigned long node) +{ +} +#endif /* CONFIG_BLK_DEV_INITRD */ + +#ifdef CONFIG_SERIAL_EARLYCON +extern struct of_device_id __earlycon_of_table[]; + +static int __init early_init_dt_scan_chosen_serial(void) +{ + int offset; + const char *p; + int l; + const struct of_device_id *match = __earlycon_of_table; + const void *fdt = initial_boot_params; + + offset = fdt_path_offset(fdt, "/chosen"); + if (offset < 0) + offset = fdt_path_offset(fdt, "/chosen@0"); + if (offset < 0) + return -ENOENT; + + p = fdt_getprop(fdt, offset, "stdout-path", &l); + if (!p) + p = fdt_getprop(fdt, offset, "linux,stdout-path", &l); + if (!p || !l) + return -ENOENT; + + /* Get the node specified by stdout-path */ + offset = fdt_path_offset(fdt, p); + if (offset < 0) + return -ENODEV; + + while (match->compatible[0]) { + unsigned long addr; + if (fdt_node_check_compatible(fdt, offset, match->compatible)) { + match++; + continue; + } + + addr = fdt_translate_address(fdt, offset); + if (!addr) + return -ENXIO; + + of_setup_earlycon(addr, match->data); + return 0; + } + return -ENODEV; +} + +static int __init setup_of_earlycon(char *buf) +{ + if (buf) + return 0; + + return early_init_dt_scan_chosen_serial(); +} +early_param("earlycon", setup_of_earlycon); +#endif + +/** + * early_init_dt_scan_root - fetch the top level address and size cells + */ +int __init early_init_dt_scan_root(unsigned long node, const char *uname, + int depth, void *data) +{ + const __be32 *prop; + + if (depth != 0) + return 0; + + dt_root_size_cells = OF_ROOT_NODE_SIZE_CELLS_DEFAULT; + dt_root_addr_cells = OF_ROOT_NODE_ADDR_CELLS_DEFAULT; + + prop = of_get_flat_dt_prop(node, "#size-cells", NULL); + if (prop) + dt_root_size_cells = be32_to_cpup(prop); + pr_debug("dt_root_size_cells = %x\n", dt_root_size_cells); + + prop = of_get_flat_dt_prop(node, "#address-cells", NULL); + if (prop) + dt_root_addr_cells = be32_to_cpup(prop); + pr_debug("dt_root_addr_cells = %x\n", dt_root_addr_cells); + + /* break now */ + return 1; +} + +u64 __init dt_mem_next_cell(int s, const __be32 **cellp) +{ + const __be32 *p = *cellp; + + *cellp = p + s; + return of_read_number(p, s); +} + +/** + * early_init_dt_scan_memory - Look for an parse memory nodes + */ +int __init early_init_dt_scan_memory(unsigned long node, const char *uname, + int depth, void *data) +{ + const char *type = of_get_flat_dt_prop(node, "device_type", NULL); + const __be32 *reg, *endp; + int l; + + /* We are scanning "memory" nodes only */ + if (type == NULL) { + /* + * The longtrail doesn't have a device_type on the + * /memory node, so look for the node called /memory@0. + */ + if (!IS_ENABLED(CONFIG_PPC32) || depth != 1 || strcmp(uname, "memory@0") != 0) + return 0; + } else if (strcmp(type, "memory") != 0) + return 0; + + reg = of_get_flat_dt_prop(node, "linux,usable-memory", &l); + if (reg == NULL) + reg = of_get_flat_dt_prop(node, "reg", &l); + if (reg == NULL) + return 0; + + endp = reg + (l / sizeof(__be32)); + + pr_debug("memory scan node %s, reg size %d,\n", uname, l); + + while ((endp - reg) >= (dt_root_addr_cells + dt_root_size_cells)) { + u64 base, size; + + base = dt_mem_next_cell(dt_root_addr_cells, ®); + size = dt_mem_next_cell(dt_root_size_cells, ®); + + if (size == 0) + continue; + pr_debug(" - %llx , %llx\n", (unsigned long long)base, + (unsigned long long)size); + + early_init_dt_add_memory_arch(base, size); + } + + return 0; +} + +int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, + int depth, void *data) +{ + int l; + const char *p; + + pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname); + + if (depth != 1 || !data || + (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) + return 0; + + early_init_dt_check_for_initrd(node); + + /* Retrieve command line */ + p = of_get_flat_dt_prop(node, "bootargs", &l); + if (p != NULL && l > 0) + strlcpy(data, p, min((int)l, COMMAND_LINE_SIZE)); + + /* + * CONFIG_CMDLINE is meant to be a default in case nothing else + * managed to set the command line, unless CONFIG_CMDLINE_FORCE + * is set in which case we override whatever was found earlier. + */ +#ifdef CONFIG_CMDLINE +#ifndef CONFIG_CMDLINE_FORCE + if (!((char *)data)[0]) +#endif + strlcpy(data, CONFIG_CMDLINE, COMMAND_LINE_SIZE); +#endif /* CONFIG_CMDLINE */ + + pr_debug("Command line is: %s\n", (char*)data); + + /* break now */ + return 1; +} + +#ifdef CONFIG_HAVE_MEMBLOCK +#define MAX_PHYS_ADDR ((phys_addr_t)~0) + +void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) +{ + const u64 phys_offset = __pa(PAGE_OFFSET); + + if (!PAGE_ALIGNED(base)) { + if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { + pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", + base, base + size); + return; + } + size -= PAGE_SIZE - (base & ~PAGE_MASK); + base = PAGE_ALIGN(base); + } + size &= PAGE_MASK; + + if (base > MAX_PHYS_ADDR) { + pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", + base, base + size); + return; + } + + if (base + size - 1 > MAX_PHYS_ADDR) { + pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", + ((u64)MAX_PHYS_ADDR) + 1, base + size); + size = MAX_PHYS_ADDR - base + 1; + } + + if (base + size < phys_offset) { + pr_warning("Ignoring memory block 0x%llx - 0x%llx\n", + base, base + size); + return; + } + if (base < phys_offset) { + pr_warning("Ignoring memory range 0x%llx - 0x%llx\n", + base, phys_offset); + size -= phys_offset - base; + base = phys_offset; + } + memblock_add(base, size); +} + +int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, + phys_addr_t size, bool nomap) +{ + if (nomap) + return memblock_remove(base, size); + return memblock_reserve(base, size); +} + +/* + * called from unflatten_device_tree() to bootstrap devicetree itself + * Architectures can override this definition if memblock isn't used + */ +void * __init __weak early_init_dt_alloc_memory_arch(u64 size, u64 align) +{ + return __va(memblock_alloc(size, align)); +} +#else +int __init __weak early_init_dt_reserve_memory_arch(phys_addr_t base, + phys_addr_t size, bool nomap) +{ + pr_err("Reserved memory not supported, ignoring range 0x%pa - 0x%pa%s\n", + &base, &size, nomap ? " (nomap)" : ""); + return -ENOSYS; +} +#endif + +bool __init early_init_dt_verify(void *params) +{ + if (!params) + return false; + + /* check device tree validity */ + if (fdt_check_header(params)) + return false; + + /* Setup flat device-tree pointer */ + initial_boot_params = params; + of_fdt_crc32 = crc32_be(~0, initial_boot_params, + fdt_totalsize(initial_boot_params)); + return true; +} + + +void __init early_init_dt_scan_nodes(void) +{ + /* Retrieve various information from the /chosen node */ + of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); + + /* Initialize {size,address}-cells info */ + of_scan_flat_dt(early_init_dt_scan_root, NULL); + + /* Setup memory, calling early_init_dt_add_memory_arch */ + of_scan_flat_dt(early_init_dt_scan_memory, NULL); +} + +bool __init early_init_dt_scan(void *params) +{ + bool status; + + status = early_init_dt_verify(params); + if (!status) + return false; + + early_init_dt_scan_nodes(); + return true; +} + +/** + * unflatten_device_tree - create tree of device_nodes from flat blob + * + * unflattens the device-tree passed by the firmware, creating the + * tree of struct device_node. It also fills the "name" and "type" + * pointers of the nodes so the normal device-tree walking functions + * can be used. + */ +void __init unflatten_device_tree(void) +{ + __unflatten_device_tree(initial_boot_params, &of_root, + early_init_dt_alloc_memory_arch); + + /* Get pointer to "/chosen" and "/aliases" nodes for use everywhere */ + of_alias_scan(early_init_dt_alloc_memory_arch); +} + +/** + * unflatten_and_copy_device_tree - copy and create tree of device_nodes from flat blob + * + * Copies and unflattens the device-tree passed by the firmware, creating the + * tree of struct device_node. It also fills the "name" and "type" + * pointers of the nodes so the normal device-tree walking functions + * can be used. This should only be used when the FDT memory has not been + * reserved such is the case when the FDT is built-in to the kernel init + * section. If the FDT memory is reserved already then unflatten_device_tree + * should be used instead. + */ +void __init unflatten_and_copy_device_tree(void) +{ + int size; + void *dt; + + if (!initial_boot_params) { + pr_warn("No valid device tree found, continuing without\n"); + return; + } + + size = fdt_totalsize(initial_boot_params); + dt = early_init_dt_alloc_memory_arch(size, + roundup_pow_of_two(FDT_V17_SIZE)); + + if (dt) { + memcpy(dt, initial_boot_params, size); + initial_boot_params = dt; + } + unflatten_device_tree(); +} + +#ifdef CONFIG_SYSFS +static ssize_t of_fdt_raw_read(struct file *filp, struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + memcpy(buf, initial_boot_params + off, count); + return count; +} + +static int __init of_fdt_raw_init(void) +{ + static struct bin_attribute of_fdt_raw_attr = + __BIN_ATTR(fdt, S_IRUSR, of_fdt_raw_read, NULL, 0); + + if (!initial_boot_params) + return 0; + + if (of_fdt_crc32 != crc32_be(~0, initial_boot_params, + fdt_totalsize(initial_boot_params))) { + pr_warn("fdt: not creating '/sys/firmware/fdt': CRC check failed\n"); + return 0; + } + of_fdt_raw_attr.size = fdt_totalsize(initial_boot_params); + return sysfs_create_bin_file(firmware_kobj, &of_fdt_raw_attr); +} +late_initcall(of_fdt_raw_init); +#endif + +#endif /* CONFIG_OF_EARLY_FLATTREE */ |