summaryrefslogtreecommitdiffstats
path: root/drivers
diff options
context:
space:
mode:
Diffstat (limited to 'drivers')
-rw-r--r--drivers/of/Kconfig1
-rw-r--r--drivers/of/Makefile2
-rw-r--r--drivers/of/fdt.c209
3 files changed, 60 insertions, 152 deletions
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index 889005fa4d04..2dcb0541012d 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -20,6 +20,7 @@ config OF_SELFTEST
config OF_FLATTREE
bool
select DTC
+ select LIBFDT
config OF_EARLY_FLATTREE
bool
diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index ed9660adad77..9891232f999e 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -10,3 +10,5 @@ obj-$(CONFIG_OF_PCI) += of_pci.o
obj-$(CONFIG_OF_PCI_IRQ) += of_pci_irq.o
obj-$(CONFIG_OF_MTD) += of_mtd.o
obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o
+
+CFLAGS_fdt.o = -I$(src)/../../scripts/dtc/libfdt
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 1d1582bb81fb..8e820a2b106d 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -19,58 +19,11 @@
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/slab.h>
+#include <linux/libfdt.h>
#include <asm/setup.h> /* for COMMAND_LINE_SIZE */
#include <asm/page.h>
-char *of_fdt_get_string(struct boot_param_header *blob, u32 offset)
-{
- return ((char *)blob) +
- be32_to_cpu(blob->off_dt_strings) + offset;
-}
-
-/**
- * of_fdt_get_property - Given a node in the given flat blob, return
- * the property ptr
- */
-void *of_fdt_get_property(struct boot_param_header *blob,
- unsigned long node, const char *name,
- int *size)
-{
- unsigned long p = node;
-
- do {
- u32 tag = be32_to_cpup((__be32 *)p);
- u32 sz, noff;
- const char *nstr;
-
- p += 4;
- if (tag == OF_DT_NOP)
- continue;
- if (tag != OF_DT_PROP)
- return NULL;
-
- sz = be32_to_cpup((__be32 *)p);
- noff = be32_to_cpup((__be32 *)(p + 4));
- p += 8;
- if (be32_to_cpu(blob->version) < 0x10)
- p = ALIGN(p, sz >= 8 ? 8 : 4);
-
- nstr = of_fdt_get_string(blob, noff);
- if (nstr == NULL) {
- pr_warning("Can't find property index name !\n");
- return NULL;
- }
- if (strcmp(name, nstr) == 0) {
- if (size)
- *size = sz;
- return (void *)p;
- }
- p += sz;
- p = ALIGN(p, 4);
- } while (1);
-}
-
/**
* of_fdt_is_compatible - Return true if given node from the given blob has
* compat in its compatible list
@@ -88,7 +41,7 @@ int of_fdt_is_compatible(struct boot_param_header *blob,
int cplen;
unsigned long l, score = 0;
- cp = of_fdt_get_property(blob, node, "compatible", &cplen);
+ cp = fdt_getprop(blob, node, "compatible", &cplen);
if (cp == NULL)
return 0;
while (cplen > 0) {
@@ -147,28 +100,27 @@ static void *unflatten_dt_alloc(void **mem, unsigned long size,
*/
static void * unflatten_dt_node(struct boot_param_header *blob,
void *mem,
- void **p,
+ int *poffset,
struct device_node *dad,
struct device_node ***allnextpp,
unsigned long fpsize)
{
+ const __be32 *p;
struct device_node *np;
struct property *pp, **prev_pp = NULL;
- char *pathp;
- u32 tag;
+ const char *pathp;
unsigned int l, allocl;
+ static int depth = 0;
+ int old_depth;
+ int offset;
int has_name = 0;
int new_format = 0;
- tag = be32_to_cpup(*p);
- if (tag != OF_DT_BEGIN_NODE) {
- pr_err("Weird tag at start of node: %x\n", tag);
+ pathp = fdt_get_name(blob, *poffset, &l);
+ if (!pathp)
return mem;
- }
- *p += 4;
- pathp = *p;
- l = allocl = strlen(pathp) + 1;
- *p = PTR_ALIGN(*p + l, 4);
+
+ 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
@@ -186,7 +138,7 @@ static void * unflatten_dt_node(struct boot_param_header *blob,
fpsize = 1;
allocl = 2;
l = 1;
- *pathp = '\0';
+ pathp = "";
} else {
/* account for '/' and path size minus terminal 0
* already in 'l'
@@ -233,32 +185,23 @@ static void * unflatten_dt_node(struct boot_param_header *blob,
}
}
/* process properties */
- while (1) {
- u32 sz, noff;
- char *pname;
-
- tag = be32_to_cpup(*p);
- if (tag == OF_DT_NOP) {
- *p += 4;
- continue;
- }
- if (tag != OF_DT_PROP)
+ 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;
- *p += 4;
- sz = be32_to_cpup(*p);
- noff = be32_to_cpup(*p + 4);
- *p += 8;
- if (be32_to_cpu(blob->version) < 0x10)
- *p = PTR_ALIGN(*p, sz >= 8 ? 8 : 4);
-
- pname = of_fdt_get_string(blob, noff);
+ }
+
if (pname == NULL) {
pr_info("Can't find property name in list !\n");
break;
}
if (strcmp(pname, "name") == 0)
has_name = 1;
- l = strlen(pname) + 1;
pp = unflatten_dt_alloc(&mem, sizeof(struct property),
__alignof__(struct property));
if (allnextpp) {
@@ -270,26 +213,25 @@ static void * unflatten_dt_node(struct boot_param_header *blob,
if ((strcmp(pname, "phandle") == 0) ||
(strcmp(pname, "linux,phandle") == 0)) {
if (np->phandle == 0)
- np->phandle = be32_to_cpup((__be32*)*p);
+ 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((__be32 *)*p);
- pp->name = pname;
+ np->phandle = be32_to_cpup(p);
+ pp->name = (char *)pname;
pp->length = sz;
- pp->value = *p;
+ pp->value = (__be32 *)p;
*prev_pp = pp;
prev_pp = &pp->next;
}
- *p = PTR_ALIGN((*p) + sz, 4);
}
/* with version 0x10 we may not have the name property, recreate
* it here from the unit name if absent
*/
if (!has_name) {
- char *p1 = pathp, *ps = pathp, *pa = NULL;
+ const char *p1 = pathp, *ps = pathp, *pa = NULL;
int sz;
while (*p1) {
@@ -326,19 +268,18 @@ static void * unflatten_dt_node(struct boot_param_header *blob,
if (!np->type)
np->type = "<NULL>";
}
- while (tag == OF_DT_BEGIN_NODE || tag == OF_DT_NOP) {
- if (tag == OF_DT_NOP)
- *p += 4;
- else
- mem = unflatten_dt_node(blob, mem, p, np, allnextpp,
- fpsize);
- tag = be32_to_cpup(*p);
- }
- if (tag != OF_DT_END_NODE) {
- pr_err("Weird tag at end of node: %x\n", tag);
- return mem;
- }
- *p += 4;
+
+ 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, allnextpp,
+ fpsize);
+
+ if (*poffset < 0 && *poffset != -FDT_ERR_NOTFOUND)
+ pr_err("unflatten: error %d processing FDT\n", *poffset);
+
return mem;
}
@@ -359,7 +300,8 @@ static void __unflatten_device_tree(struct boot_param_header *blob,
void * (*dt_alloc)(u64 size, u64 align))
{
unsigned long size;
- void *start, *mem;
+ int start;
+ void *mem;
struct device_node **allnextp = mynodes;
pr_debug(" -> unflatten_device_tree()\n");
@@ -380,7 +322,7 @@ static void __unflatten_device_tree(struct boot_param_header *blob,
}
/* First pass, scan for size */
- start = ((void *)blob) + be32_to_cpu(blob->off_dt_struct);
+ start = 0;
size = (unsigned long)unflatten_dt_node(blob, 0, &start, NULL, NULL, 0);
size = ALIGN(size, 4);
@@ -395,10 +337,8 @@ static void __unflatten_device_tree(struct boot_param_header *blob,
pr_debug(" unflattening %p...\n", mem);
/* Second pass, do actual unflattening */
- start = ((void *)blob) + be32_to_cpu(blob->off_dt_struct);
+ start = 0;
unflatten_dt_node(blob, mem, &start, NULL, &allnextp, 0);
- if (be32_to_cpup(start) != OF_DT_END)
- pr_warning("Weird tag at end of tree: %08x\n", be32_to_cpup(start));
if (be32_to_cpup(mem + size) != 0xdeadbeef)
pr_warning("End of tree marker overwritten: %08x\n",
be32_to_cpup(mem + size));
@@ -574,47 +514,19 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
void *data),
void *data)
{
- unsigned long p = ((unsigned long)initial_boot_params) +
- be32_to_cpu(initial_boot_params->off_dt_struct);
- int rc = 0;
- int depth = -1;
-
- do {
- u32 tag = be32_to_cpup((__be32 *)p);
- const char *pathp;
-
- p += 4;
- if (tag == OF_DT_END_NODE) {
- depth--;
- continue;
- }
- if (tag == OF_DT_NOP)
- continue;
- if (tag == OF_DT_END)
- break;
- if (tag == OF_DT_PROP) {
- u32 sz = be32_to_cpup((__be32 *)p);
- p += 8;
- if (be32_to_cpu(initial_boot_params->version) < 0x10)
- p = ALIGN(p, sz >= 8 ? 8 : 4);
- p += sz;
- p = ALIGN(p, 4);
- continue;
- }
- if (tag != OF_DT_BEGIN_NODE) {
- pr_err("Invalid tag %x in flat device tree!\n", tag);
- return -EINVAL;
- }
- depth++;
- pathp = (char *)p;
- p = ALIGN(p + strlen(pathp) + 1, 4);
+ 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(p, pathp, depth, data);
- if (rc != 0)
- break;
- } while (1);
-
+ rc = it(offset, pathp, depth, data);
+ }
return rc;
}
@@ -623,14 +535,7 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
*/
unsigned long __init of_get_flat_dt_root(void)
{
- unsigned long p = ((unsigned long)initial_boot_params) +
- be32_to_cpu(initial_boot_params->off_dt_struct);
-
- while (be32_to_cpup((__be32 *)p) == OF_DT_NOP)
- p += 4;
- BUG_ON(be32_to_cpup((__be32 *)p) != OF_DT_BEGIN_NODE);
- p += 4;
- return ALIGN(p + strlen((char *)p) + 1, 4);
+ return 0;
}
/**
@@ -642,7 +547,7 @@ unsigned long __init of_get_flat_dt_root(void)
const void *__init of_get_flat_dt_prop(unsigned long node, const char *name,
int *size)
{
- return of_fdt_get_property(initial_boot_params, node, name, size);
+ return fdt_getprop(initial_boot_params, node, name, size);
}
/**
OpenPOWER on IntegriCloud