fixed the following compile error when use avr32 atstk1006_defconfig:
drivers/mtd/nand/atmel_nand.c: In function 'pmecc_err_location':
drivers/mtd/nand/atmel_nand.c:639: error: implicit declaration of function 'writel_relaxed'
which was introduced by commit 1c7b874d33b463 ("mtd: at91: atmel_nand: add Programmable Multibit ECC controller support").
The PMECC for nand flash code uses writel_relaxed(). But in avr32, there is no macro "writel_relaxed" defined. This patch add writex_relaxed macro definitions.
Signed-off-by: Josh Wu <[email protected]>
---
arch/avr32/include/asm/io.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/avr32/include/asm/io.h b/arch/avr32/include/asm/io.h
index cf60d0a..fc6483f 100644
--- a/arch/avr32/include/asm/io.h
+++ b/arch/avr32/include/asm/io.h
@@ -165,6 +165,10 @@ BUILDIO_IOPORT(l, u32)
#define readw_be __raw_readw
#define readl_be __raw_readl
+#define writeb_relaxed writeb
+#define writew_relaxed writew
+#define writel_relaxed writel
+
#define writeb_be __raw_writeb
#define writew_be __raw_writew
#define writel_be __raw_writel
--
1.7.9.5
Around Tue 16 Oct 2012 15:19:27 +0800 or thereabout, Josh Wu wrote:
> fixed the following compile error when use avr32 atstk1006_defconfig:
> drivers/mtd/nand/atmel_nand.c: In function 'pmecc_err_location':
> drivers/mtd/nand/atmel_nand.c:639: error: implicit declaration of function 'writel_relaxed'
>
> which was introduced by commit 1c7b874d33b463 ("mtd: at91: atmel_nand: add Programmable Multibit ECC controller support").
> The PMECC for nand flash code uses writel_relaxed(). But in avr32, there is no macro "writel_relaxed" defined. This patch add writex_relaxed macro definitions.
>
> Signed-off-by: Josh Wu <[email protected]>
> ---
> arch/avr32/include/asm/io.h | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/avr32/include/asm/io.h b/arch/avr32/include/asm/io.h
> index cf60d0a..fc6483f 100644
> --- a/arch/avr32/include/asm/io.h
> +++ b/arch/avr32/include/asm/io.h
> @@ -165,6 +165,10 @@ BUILDIO_IOPORT(l, u32)
> #define readw_be __raw_readw
> #define readl_be __raw_readl
>
> +#define writeb_relaxed writeb
> +#define writew_relaxed writew
> +#define writel_relaxed writel
> +
I'm wondering if they should be something similar to SH arch:
#define writeb_relaxed(v,c) ((void)__raw_writeb((__force u8)ioswabb(v),c))
What is the intention behind the macro? Which restriction is relaxed?
> #define writeb_be __raw_writeb
> #define writew_be __raw_writew
> #define writel_be __raw_writel
--
mvh
Hans-Christian Egtvedt
On 10/16/2012 5:17 PM, Hans-Christian Egtvedt wrote:
> Around Tue 16 Oct 2012 15:19:27 +0800 or thereabout, Josh Wu wrote:
>> fixed the following compile error when use avr32 atstk1006_defconfig:
>> drivers/mtd/nand/atmel_nand.c: In function 'pmecc_err_location':
>> drivers/mtd/nand/atmel_nand.c:639: error: implicit declaration of function 'writel_relaxed'
>>
>> which was introduced by commit 1c7b874d33b463 ("mtd: at91: atmel_nand: add Programmable Multibit ECC controller support").
>> The PMECC for nand flash code uses writel_relaxed(). But in avr32, there is no macro "writel_relaxed" defined. This patch add writex_relaxed macro definitions.
>>
>> Signed-off-by: Josh Wu <[email protected]>
>> ---
>> arch/avr32/include/asm/io.h | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/arch/avr32/include/asm/io.h b/arch/avr32/include/asm/io.h
>> index cf60d0a..fc6483f 100644
>> --- a/arch/avr32/include/asm/io.h
>> +++ b/arch/avr32/include/asm/io.h
>> @@ -165,6 +165,10 @@ BUILDIO_IOPORT(l, u32)
>> #define readw_be __raw_readw
>> #define readl_be __raw_readl
>>
>> +#define writeb_relaxed writeb
>> +#define writew_relaxed writew
>> +#define writel_relaxed writel
>> +
> I'm wondering if they should be something similar to SH arch:
>
> #define writeb_relaxed(v,c) ((void)__raw_writeb((__force u8)ioswabb(v),c))
>
> What is the intention behind the macro? Which restriction is relaxed?
According to my understanding, the xxx_relaxed() is that I/O function
without any memory barriers. for Multi-cpu, the execute order are less
limited.
So the relaxed write function should be more effective than non-relaxed one.
But for single cpu, relaxed function should work same as non-relaxed
function.
Please correct me if I'm understand in a wrong way.
Best Regards,
Josh Wu
>
>> #define writeb_be __raw_writeb
>> #define writew_be __raw_writew
>> #define writel_be __raw_writel
On 16.10.2012 11:17, Hans-Christian Egtvedt wrote:
> Around Tue 16 Oct 2012 15:19:27 +0800 or thereabout, Josh Wu wrote:
>> fixed the following compile error when use avr32 atstk1006_defconfig:
>> drivers/mtd/nand/atmel_nand.c: In function 'pmecc_err_location':
>> drivers/mtd/nand/atmel_nand.c:639: error: implicit declaration of function 'writel_relaxed'
>>
>> which was introduced by commit 1c7b874d33b463 ("mtd: at91: atmel_nand: add Programmable Multibit ECC controller support").
>> The PMECC for nand flash code uses writel_relaxed(). But in avr32, there is no macro "writel_relaxed" defined. This patch add writex_relaxed macro definitions.
>>
>> Signed-off-by: Josh Wu <[email protected]>
>> ---
>> arch/avr32/include/asm/io.h | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/arch/avr32/include/asm/io.h b/arch/avr32/include/asm/io.h
>> index cf60d0a..fc6483f 100644
>> --- a/arch/avr32/include/asm/io.h
>> +++ b/arch/avr32/include/asm/io.h
>> @@ -165,6 +165,10 @@ BUILDIO_IOPORT(l, u32)
>> #define readw_be __raw_readw
>> #define readl_be __raw_readl
>>
>> +#define writeb_relaxed writeb
>> +#define writew_relaxed writew
>> +#define writel_relaxed writel
>> +
>
> I'm wondering if they should be something similar to SH arch:
>
> #define writeb_relaxed(v,c) ((void)__raw_writeb((__force u8)ioswabb(v),c))
I think it is OK to just use the writeX here. These are in fact an
inlined function built out of a macro. The inlined function does nearly
what you have written down here and in contrast to the ARM version omits
the memory barrier.
The main difference between __raw_ access and the writeX/readX access
for AVR32 is this little __swizzle_addr_. It takes the configuration of
SMC (8/16/32 bit access) into account which would be omitted when we
switch to __raw_ accessors here. This would be a major change if one
used the writeX/readX accessors before and switched the SMC to something
different than 32 Bit access.
Best regards
Andreas Bie?mann
On Tue, Oct 16, 2012 at 12:19 AM, Josh Wu <[email protected]> wrote:
> fixed the following compile error when use avr32 atstk1006_defconfig:
> drivers/mtd/nand/atmel_nand.c: In function 'pmecc_err_location':
> drivers/mtd/nand/atmel_nand.c:639: error: implicit declaration of function 'writel_relaxed'
>
> which was introduced by commit 1c7b874d33b463 ("mtd: at91: atmel_nand: add Programmable Multibit ECC controller support").
> The PMECC for nand flash code uses writel_relaxed(). But in avr32, there is no macro "writel_relaxed" defined. This patch add writex_relaxed macro definitions.
>
> Signed-off-by: Josh Wu <[email protected]>
Acked-by: Havard Skinnemoen <[email protected]>
I think it's OK to just forward to write[bwl] -- the relaxed variants
merely provide fewer ordering guarantees than the non-relaxed
variants. The worst that could happen is a small performance hit (and
on AVR32, even that is highly unlikely).
Havard
Sorry, please drop this email. I will send out another one to include
[email protected]
Best Regards,
Josh Wu
On 4/1/2013 1:58 PM, Josh Wu wrote:
> fixed the following compile error when use avr32 atstk1006_defconfig:
> drivers/mtd/nand/atmel_nand.c: In function 'pmecc_err_location':
> drivers/mtd/nand/atmel_nand.c:639: error: implicit declaration of function 'writel_relaxed'
>
> which was introduced by commit 1c7b874d33b463 ("mtd: at91: atmel_nand: add Programmable Multibit ECC controller support").
> The PMECC for nand flash code uses writel_relaxed(). But in avr32, there is no macro "writel_relaxed" defined. This patch add writex_relaxed macro definitions.
>
> Signed-off-by: Josh Wu <[email protected]>
> Acked-by: Havard Skinnemoen <[email protected]>
> Acked-by: Hans-Christian Egtvedt <[email protected]>
>
> ---
> arch/avr32/include/asm/io.h | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/avr32/include/asm/io.h b/arch/avr32/include/asm/io.h
> index cf60d0a..fc6483f 100644
> --- a/arch/avr32/include/asm/io.h
> +++ b/arch/avr32/include/asm/io.h
> @@ -165,6 +165,10 @@ BUILDIO_IOPORT(l, u32)
> #define readw_be __raw_readw
> #define readl_be __raw_readl
>
> +#define writeb_relaxed writeb
> +#define writew_relaxed writew
> +#define writel_relaxed writel
> +
> #define writeb_be __raw_writeb
> #define writew_be __raw_writew
> #define writel_be __raw_writel