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| author | Joe Schaack <jschaack@xes-inc.com> | 2013-02-21 23:29:45 +0100 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2013-04-05 13:05:53 +0200 |
| commit | 05ff8c258c76dd469232a03ec8d45f7e7267e0ac (patch) | |
| tree | bbecfe3fc604264c90c6037477120d520d594ef4 | |
| parent | mtd: m25p80: n25q064 is Micron, not Intel/Numonyx (diff) | |
| download | linux-05ff8c258c76dd469232a03ec8d45f7e7267e0ac.tar.xz linux-05ff8c258c76dd469232a03ec8d45f7e7267e0ac.zip | |
mtd: ofpart: support partitions of 4 GiB and larger
Previously, partitions were limited to less than 4 GiB in size because
the address and size were read as 32-bit values. Add support for 64-bit
values to support devices of 4 GiB and larger.
Signed-off-by: Joe Schaack <jschaack@xes-inc.com>
Signed-off-by: Nate Case <ncase@xes-inc.com>
Signed-off-by: Aaron Sierra <asierra@xes-inc.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
| -rw-r--r-- | Documentation/devicetree/bindings/mtd/partition.txt | 36 | ||||
| -rw-r--r-- | drivers/mtd/ofpart.c | 7 |
2 files changed, 39 insertions, 4 deletions
diff --git a/Documentation/devicetree/bindings/mtd/partition.txt b/Documentation/devicetree/bindings/mtd/partition.txt index 6e1f61f1e789..9315ac96b49b 100644 --- a/Documentation/devicetree/bindings/mtd/partition.txt +++ b/Documentation/devicetree/bindings/mtd/partition.txt @@ -5,8 +5,12 @@ on platforms which have strong conventions about which portions of a flash are used for what purposes, but which don't use an on-flash partition table such as RedBoot. -#address-cells & #size-cells must both be present in the mtd device and be -equal to 1. +#address-cells & #size-cells must both be present in the mtd device. There are +two valid values for both: +<1>: for partitions that require a single 32-bit cell to represent their + size/address (aka the value is below 4 GiB) +<2>: for partitions that require two 32-bit cells to represent their + size/address (aka the value is 4 GiB or greater). Required properties: - reg : The partition's offset and size within the mtd bank. @@ -36,3 +40,31 @@ flash@0 { reg = <0x0100000 0x200000>; }; }; + +flash@1 { + #address-cells = <1>; + #size-cells = <2>; + + /* a 4 GiB partition */ + partition@0 { + label = "filesystem"; + reg = <0x00000000 0x1 0x00000000>; + }; +}; + +flash@2 { + #address-cells = <2>; + #size-cells = <2>; + + /* an 8 GiB partition */ + partition@0 { + label = "filesystem #1"; + reg = <0x0 0x00000000 0x2 0x00000000>; + }; + + /* a 4 GiB partition */ + partition@200000000 { + label = "filesystem #2"; + reg = <0x2 0x00000000 0x1 0x00000000>; + }; +}; diff --git a/drivers/mtd/ofpart.c b/drivers/mtd/ofpart.c index 30bd907a260a..553d6d6d5603 100644 --- a/drivers/mtd/ofpart.c +++ b/drivers/mtd/ofpart.c @@ -55,6 +55,7 @@ static int parse_ofpart_partitions(struct mtd_info *master, while ((pp = of_get_next_child(node, pp))) { const __be32 *reg; int len; + int a_cells, s_cells; reg = of_get_property(pp, "reg", &len); if (!reg) { @@ -62,8 +63,10 @@ static int parse_ofpart_partitions(struct mtd_info *master, continue; } - (*pparts)[i].offset = be32_to_cpu(reg[0]); - (*pparts)[i].size = be32_to_cpu(reg[1]); + a_cells = of_n_addr_cells(pp); + s_cells = of_n_size_cells(pp); + (*pparts)[i].offset = of_read_number(reg, a_cells); + (*pparts)[i].size = of_read_number(reg + a_cells, s_cells); partname = of_get_property(pp, "label", &len); if (!partname) |