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authorJason Gunthorpe <jgunthorpe@obsidianresearch.com>2010-03-09 12:27:56 -0700
committerDavid Woodhouse <David.Woodhouse@intel.com>2010-05-14 00:32:30 +0100
commit9d5da3a9b849cf42fc165e90b1d39e2fd1e199a8 (patch)
treef1d66bb84b510f8ba53e232e9b5d9499a1bd20a3 /drivers/mtd/maps/physmap_of.c
parent2bfefa4c9632fb09bfe3277cf7b690818b147654 (diff)
downloadlinaro-lsk-9d5da3a9b849cf42fc165e90b1d39e2fd1e199a8.tar.gz
mtd: extend physmap_of to let the device tree specify the parition probe
This is to support custom partitioning schemes for embedded PPC. To use define your own mtd_part_parser and then add something like: linux,part-probe = "my_probe", "cmdlinepart"; To the board's dts file. If linux,part-probe is not specified then this behaves the same as before. Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd/maps/physmap_of.c')
-rw-r--r--drivers/mtd/maps/physmap_of.c53
1 files changed, 48 insertions, 5 deletions
diff --git a/drivers/mtd/maps/physmap_of.c b/drivers/mtd/maps/physmap_of.c
index bbdd2194190..36dbcee1ac2 100644
--- a/drivers/mtd/maps/physmap_of.c
+++ b/drivers/mtd/maps/physmap_of.c
@@ -173,12 +173,53 @@ static struct mtd_info * __devinit obsolete_probe(struct of_device *dev,
}
}
+#ifdef CONFIG_MTD_PARTITIONS
+/* When partitions are set we look for a linux,part-probe property which
+ specifies the list of partition probers to use. If none is given then the
+ default is use. These take precedence over other device tree
+ information. */
+static const char *part_probe_types_def[] = { "cmdlinepart", "RedBoot", NULL };
+static const char ** __devinit of_get_probes(struct device_node *dp)
+{
+ const char *cp;
+ int cplen;
+ unsigned int l;
+ unsigned int count;
+ const char **res;
+
+ cp = of_get_property(dp, "linux,part-probe", &cplen);
+ if (cp == NULL)
+ return part_probe_types_def;
+
+ count = 0;
+ for (l = 0; l != cplen; l++)
+ if (cp[l] == 0)
+ count++;
+
+ res = kzalloc((count + 1)*sizeof(*res), GFP_KERNEL);
+ count = 0;
+ while (cplen > 0) {
+ res[count] = cp;
+ l = strlen(cp) + 1;
+ cp += l;
+ cplen -= l;
+ count++;
+ }
+ return res;
+}
+
+static void __devinit of_free_probes(const char **probes)
+{
+ if (probes != part_probe_types_def)
+ kfree(probes);
+}
+#endif
+
static int __devinit of_flash_probe(struct of_device *dev,
const struct of_device_id *match)
{
#ifdef CONFIG_MTD_PARTITIONS
- static const char *part_probe_types[]
- = { "cmdlinepart", "RedBoot", NULL };
+ const char **part_probe_types;
#endif
struct device_node *dp = dev->node;
struct resource res;
@@ -307,12 +348,14 @@ static int __devinit of_flash_probe(struct of_device *dev,
goto err_out;
#ifdef CONFIG_MTD_PARTITIONS
- /* First look for RedBoot table or partitions on the command
- * line, these take precedence over device tree information */
+ part_probe_types = of_get_probes(dp);
err = parse_mtd_partitions(info->cmtd, part_probe_types,
&info->parts, 0);
- if (err < 0)
+ if (err < 0) {
+ of_free_probes(part_probe_types);
return err;
+ }
+ of_free_probes(part_probe_types);
#ifdef CONFIG_MTD_OF_PARTS
if (err == 0) {