[RFC 08/17] ARM: shmobile: r8a7779: Add helper to read mode pins
Sergei Shtylyov
sergei.shtylyov at cogentembedded.com
Mon Nov 25 06:53:25 EST 2013
Hello.
On 25-11-2013 5:18, Simon Horman wrote:
> Add and use helper to read mode pins.
> This will be re-used when moving marzen-reference to
> the common clock framework.
> Signed-off-by: Simon Horman <horms+renesas at verge.net.au>
> ---
> arch/arm/mach-shmobile/clock-r8a7779.c | 11 ++---------
> arch/arm/mach-shmobile/include/mach/r8a7779.h | 1 +
> arch/arm/mach-shmobile/setup-r8a7779.c | 14 ++++++++++++++
> 3 files changed, 17 insertions(+), 9 deletions(-)
> diff --git a/arch/arm/mach-shmobile/clock-r8a7779.c b/arch/arm/mach-shmobile/clock-r8a7779.c
> index b7ce0e7..decf122 100644
> --- a/arch/arm/mach-shmobile/clock-r8a7779.c
> +++ b/arch/arm/mach-shmobile/clock-r8a7779.c
[...]
> diff --git a/arch/arm/mach-shmobile/setup-r8a7779.c b/arch/arm/mach-shmobile/setup-r8a7779.c
> index 8f94531..4e3fbfb 100644
> --- a/arch/arm/mach-shmobile/setup-r8a7779.c
> +++ b/arch/arm/mach-shmobile/setup-r8a7779.c
> @@ -874,6 +874,20 @@ void __init r8a7779_add_standard_devices_dt(void)
> of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
> }
>
> +#define MODEMR 0xffcc0020
> +
> +u32 __init r8a7779_read_mode_pins(void)
> +{
> + void __iomem *modemr = ioremap_nocache(MODEMR, PAGE_SIZE);
Why waste 2 4K pages if you're only interested in 4 bytes (i.e. 1 page)? I
remember I've already asked that question...
> + u32 mode;
> +
> + BUG_ON(!modemr);
> + mode = ioread32(modemr);
> + iounmap(modemr);
> +
> + return mode;
> +}
> +
WBR, Sergei
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