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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>
This commit is contained in:
Joe Schaack 2013-02-21 16:29:45 -06:00 committed by David Woodhouse
parent e66e280c36
commit 05ff8c258c
2 changed files with 39 additions and 4 deletions
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36
Documentation/devicetree/bindings/mtd/partition.txt
View File

@ -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>;
};
};

7
drivers/mtd/ofpart.c
View File

@ -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)