[PATCH] mtd: ofpart: support partitions of 4 GB and larger

[PATCH] mtd: ofpart: support partitions of 4 GB and larger

[Aaron Sierra]

Author: Joe Schaack <jschaack@xes-inc.com>

Previously, partitions were limited to less than 4 GB in size because
the address and size were read as 32-bit values. Add support for 64-bit
values to support devices of 4 GB 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>
---
 drivers/mtd/ofpart.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/ofpart.c b/drivers/mtd/ofpart.c
index 30bd907..553d6d6 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)
-- 
1.7.9.5

Re: [PATCH] mtd: ofpart: support partitions of 4 GB and larger

[Huang Shijie]

于 2013年02月20日 06:23, Aaron Sierra 写道:
> Author: Joe Schaack<jschaack@xes-inc.com>
>
> Previously, partitions were limited to less than 4 GB in size because
> the address and size were read as 32-bit values. Add support for 64-bit
> values to support devices of 4 GB 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>
> ---
>   drivers/mtd/ofpart.c |    7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mtd/ofpart.c b/drivers/mtd/ofpart.c
> index 30bd907..553d6d6 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)
I think it's better to update the 
Documentation/devicetree/bindings/mtd/partition.txt too. for example, 
add a example for the
partition larger then 4G.

thanks
Huang Shijie

Re: [PATCH] mtd: ofpart: support partitions of 4 GB and larger

[Aaron Sierra]

> > Previously, partitions were limited to less than 4 GB in size
> > because
> > the address and size were read as 32-bit values. Add support for
> > 64-bit
> > values to support devices of 4 GB 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>
> > ---
> >   drivers/mtd/ofpart.c |    7 +++++--
> >   1 file changed, 5 insertions(+), 2 deletions(-)

> I think it's better to update the
> Documentation/devicetree/bindings/mtd/partition.txt too. for example,
> add a example for the partition larger then 4G.
> 
> thanks
> Huang Shijie
> 

Good idea Huang, I'm on it.

-Aaron S.