[PATCH 13/29] of: make flatten independent of libfdt
Sascha Hauer
s.hauer at pengutronix.de
Tue Feb 26 15:18:40 EST 2013
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
common/oftree.c | 8 ++-
drivers/of/base.c | 180 ++++++++++++++++++++++++++++++++++++++++++++---------
include/of.h | 4 +-
3 files changed, 160 insertions(+), 32 deletions(-)
diff --git a/common/oftree.c b/common/oftree.c
index 0df5209..841d2c4 100644
--- a/common/oftree.c
+++ b/common/oftree.c
@@ -329,7 +329,13 @@ struct fdt_header *of_get_fixed_tree(struct fdt_header *fdt)
int size, align;
if (!fdt) {
- fdt = internalfdt = of_flatten_dtb();
+ struct device_node *root_node;
+
+ root_node = of_get_root_node();
+ if (!root_node)
+ return NULL;
+
+ fdt = internalfdt = of_flatten_dtb(root_node);
if (!fdt)
return NULL;
}
diff --git a/drivers/of/base.c b/drivers/of/base.c
index d6ca949..cd463e9 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1154,20 +1154,108 @@ err:
return ERR_PTR(ret);
}
-static int __of_flatten_dtb(void *fdt, struct device_node *node)
+struct fdt {
+ void *dt;
+ uint32_t dt_nextofs;
+ uint32_t dt_size;
+ char *strings;
+ uint32_t str_nextofs;
+ uint32_t str_size;
+};
+
+static inline uint32_t dt_next_ofs(uint32_t curofs, uint32_t len)
+{
+ return ALIGN(curofs + len, 4);
+}
+
+static int lstrcpy(char *dest, const char *src)
+{
+ int len = 0;
+ int maxlen = 1023;
+
+ while (*src) {
+ *dest++ = *src++;
+ len++;
+ if (!maxlen)
+ return -ENOSPC;
+ maxlen--;
+ }
+
+ return len;
+}
+
+static int fdt_ensure_space(struct fdt *fdt, int dtsize)
+{
+ /*
+ * We assume strings and names have a maximum length of 1024
+ * whereas properties can be longer. We allocate new memory
+ * if we have less than 1024 bytes (+ the property size left.
+ */
+ if (fdt->str_size - fdt->str_nextofs < 1024) {
+ fdt->strings = realloc(fdt->strings, fdt->str_size * 2);
+ if (!fdt->strings)
+ return -ENOMEM;
+ fdt->str_size *= 2;
+ }
+
+ if (fdt->dt_size - fdt->dt_nextofs < 1024 + dtsize) {
+ fdt->dt = realloc(fdt->dt, fdt->dt_size * 2);
+ if (!fdt->dt)
+ return -ENOMEM;
+ fdt->dt_size *= 2;
+ }
+
+ return 0;
+}
+
+static inline int dt_add_string(struct fdt *fdt, const char *str)
+{
+ uint32_t ret;
+ int len;
+
+ if (fdt_ensure_space(fdt, 0) < 0)
+ return -ENOMEM;
+
+ len = lstrcpy(fdt->strings + fdt->str_nextofs, str);
+ if (len < 0)
+ return -ENOSPC;
+
+ ret = fdt->str_nextofs;
+
+ fdt->str_nextofs += len + 1;
+
+ return ret;
+}
+
+static int __of_flatten_dtb(struct fdt *fdt, struct device_node *node)
{
struct property *p;
struct device_node *n;
int ret;
+ unsigned int len;
+ struct fdt_node_header *nh = fdt->dt + fdt->dt_nextofs;
- ret = fdt_begin_node(fdt, node->name);
- if (ret)
- return ret;
+ if (fdt_ensure_space(fdt, 0) < 0)
+ return -ENOMEM;
+
+ nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
+ len = lstrcpy(nh->name, node->name);
+ fdt->dt_nextofs = dt_next_ofs(fdt->dt_nextofs, 4 + len + 1);
list_for_each_entry(p, &node->properties, list) {
- ret = fdt_property(fdt, p->name, p->value, p->length);
- if (ret)
- return ret;
+ struct fdt_property *fp;
+
+ if (fdt_ensure_space(fdt, p->length) < 0)
+ return -ENOMEM;
+
+ fp = fdt->dt + fdt->dt_nextofs;
+
+ fp->tag = cpu_to_fdt32(FDT_PROP);
+ fp->len = cpu_to_fdt32(p->length);
+ fp->nameoff = cpu_to_fdt32(dt_add_string(fdt, p->name));
+ memcpy(fp->data, p->value, p->length);
+ fdt->dt_nextofs = dt_next_ofs(fdt->dt_nextofs,
+ sizeof(struct fdt_property) + p->length);
}
list_for_each_entry(n, &node->children, parent_list) {
@@ -1176,45 +1264,79 @@ static int __of_flatten_dtb(void *fdt, struct device_node *node)
return ret;
}
- ret = fdt_end_node(fdt);
+ nh = fdt->dt + fdt->dt_nextofs;
+ nh->tag = cpu_to_fdt32(FDT_END_NODE);
+ fdt->dt_nextofs = dt_next_ofs(fdt->dt_nextofs,
+ sizeof(struct fdt_node_header));
- return ret;
-}
+ if (fdt_ensure_space(fdt, 0) < 0)
+ return -ENOMEM;
-#define DTB_SIZE SZ_128K
+ return 0;
+}
-void *of_flatten_dtb(void)
+/**
+ * of_flatten_dtb - flatten a barebox internal devicetree to a dtb
+ * @node - the root node of the tree to be unflattened
+ */
+void *of_flatten_dtb(struct device_node *node)
{
- void *fdt;
int ret;
+ struct fdt_header header = {};
+ struct fdt fdt = {};
+ uint32_t ofs;
+ struct fdt_node_header *nh;
- if (!root_node)
- return NULL;
+ header.magic = cpu_to_fdt32(FDT_MAGIC);
+ header.version = cpu_to_fdt32(0x11);
+ header.last_comp_version = cpu_to_fdt32(0x10);
- fdt = malloc(DTB_SIZE);
- if (!fdt)
- return NULL;
+ fdt.dt = xzalloc(SZ_64K);
+ fdt.dt_size = SZ_64K;
- memset(fdt, 0, DTB_SIZE);
+ fdt.strings = xzalloc(SZ_64K);
+ fdt.str_size = SZ_64K;
- ret = fdt_create(fdt, DTB_SIZE);
- if (ret)
- goto out_free;
+ ofs = sizeof(struct fdt_header);
- ret = fdt_finish_reservemap(fdt);
- if (ret)
- goto out_free;
+ header.off_mem_rsvmap = cpu_to_fdt32(ofs);
+ ofs += sizeof(struct fdt_reserve_entry);
+
+ fdt.dt_nextofs = ofs;
- ret = __of_flatten_dtb(fdt, root_node);
+ ret = __of_flatten_dtb(&fdt, node);
if (ret)
goto out_free;
+ nh = fdt.dt + fdt.dt_nextofs;
+ nh->tag = cpu_to_fdt32(FDT_END);
+ fdt.dt_nextofs = dt_next_ofs(fdt.dt_nextofs, sizeof(struct fdt_node_header));
+
+ header.size_dt_strings = cpu_to_fdt32(fdt.str_nextofs);
+ header.size_dt_struct = cpu_to_fdt32(fdt.dt_nextofs);
+
+ header.off_dt_struct = cpu_to_fdt32(ofs);
+
+ header.off_dt_strings = cpu_to_fdt32(fdt.dt_nextofs);
+
+ if (fdt.dt_size - fdt.dt_nextofs < fdt.str_nextofs) {
+ fdt.dt = realloc(fdt.dt, fdt.dt_nextofs + fdt.str_nextofs);
+ if (!fdt.dt)
+ goto out_free;
+ }
+
+ memcpy(fdt.dt + fdt.dt_nextofs, fdt.strings, fdt.str_nextofs);
+
+ header.totalsize = cpu_to_fdt32(fdt.dt_nextofs + fdt.str_nextofs);
+
+ memcpy(fdt.dt, &header, sizeof(header));
- fdt_finish(fdt);
+ free(fdt.strings);
- return fdt;
+ return fdt.dt;
out_free:
- free(fdt);
+ free(fdt.strings);
+ free(fdt.dt);
return NULL;
}
diff --git a/include/of.h b/include/of.h
index f2fd84b..e7d74d8 100644
--- a/include/of.h
+++ b/include/of.h
@@ -140,7 +140,7 @@ int of_set_root_node(struct device_node *);
int of_alias_get_id(struct device_node *np, const char *stem);
int of_device_is_stdout_path(struct device_d *dev);
const char *of_get_model(void);
-void *of_flatten_dtb(void);
+void *of_flatten_dtb(struct device_node *node);
#else
static inline int of_parse_partitions(const char *cdevname,
struct device_node *node)
@@ -168,7 +168,7 @@ static inline const char *of_get_model(void)
return NULL;
}
-static inline void *of_flatten_dtb(void)
+static inline void *of_flatten_dtb(struct device_node *node)
{
return NULL;
}
--
1.7.10.4
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