[PATCH v2 0/5] MIPS: XBurst: fix the JZ4755's clocksource

[PATCH v2 0/5] MIPS: XBurst: fix the JZ4755's clocksource

[Antony Pavlov]

This patch series fixes error in JZ4755's clocksource code.

First, it fixes common {BIG,LITTLE}_ENDIAN defines
to make work MIPS little-endian clocksource code.

Next, the patch series fixes the JZ4755's clocksource code itself.

[PATCH v2 1/5] byteorder: fix {BIG,LITTLE}_ENDIAN defines
[PATCH v2 2/5] byteorder: add sanity check
[PATCH v2 3/5] clocksource: move the NSEC_PER_SEC constant to common
[PATCH v2 4/5] MIPS: XBurst: fix the JZ4755's clocksource input
[PATCH v2 5/5] MIPS: XBurst: use clocks_calc_mult_shift() for

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[PATCH v2 1/5] byteorder: fix {BIG,LITTLE}_ENDIAN defines

[Antony Pavlov]

In the Linux kernel sources the only one byteorder macro
can be defined (__BIG_ENDIAN or __LITTLE_ENDIAN) at a time.

In barebox we have the __BIG_ENDIAN and __LITTLE_ENDIAN macros
defined simultaneously introduced in

    commit 9ad1fe64abb12baac918ec177d9a52bbf2980d16
    Author: Baruch Siach <baruch@tkos.co.il>
    Date:   Sun Jun 27 08:46:05 2010 +0300

      byteorder: add missing {BIG,LITTLE}_ENDIAN defines

      This fixes build warnings when testing __BYTE_ORDER
      of the other kin

But in arch/mips/lib/libgcc.h (from Linux) we have

 #ifdef __BIG_ENDIAN
 struct DWstruct {
         int high, low;
 };
 #elif defined(__LITTLE_ENDIAN)
 struct DWstruct {
         int low, high;
 };
 #else
 #error I feel sick.
 #endif

This means that regardless of current byteorder the big-endian
DWstruct will be selected. By turn this breaks the __lshrdi3()
function and the clocksource code on little-endian MIPS.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 drivers/ata/disk_ata_drive.c      |    2 +-
 drivers/nor/cfi_flash.c           |    6 +++---
 include/cramfs/cramfs_fs.h        |    4 ++--
 include/envfs.h                   |   16 ++++++++++++----
 include/linux/byteorder/generic.h |    7 -------
 include/usb/usb.h                 |    2 +-
 6 files changed, 19 insertions(+), 18 deletions(-)

diff --git a/drivers/ata/disk_ata_drive.c b/drivers/ata/disk_ata_drive.c
index 4602af3..d5c5837 100644
--- a/drivers/ata/disk_ata_drive.c
+++ b/drivers/ata/disk_ata_drive.c
@@ -231,7 +231,7 @@ static void __maybe_unused ata_dump_id(uint16_t *id)
  */
 static void ata_fix_endianess(uint16_t *buf, unsigned wds)
 {
-#if __BYTE_ORDER == __BIG_ENDIAN
+#ifdef __BIG_ENDIAN
 	unsigned u;
 
 	for (u = 0; u < wds; u++)
diff --git a/drivers/nor/cfi_flash.c b/drivers/nor/cfi_flash.c
index 654e647..02340e6 100644
--- a/drivers/nor/cfi_flash.c
+++ b/drivers/nor/cfi_flash.c
@@ -82,7 +82,7 @@ static void flash_add_byte (struct flash_info *info, cfiword_t * cword, uchar c)
 		return;
 	}
 
-#if __BYTE_ORDER == __BIG_ENDIAN
+#ifdef __BIG_ENDIAN
 	*cword = (*cword << 8) | c;
 #else
 
@@ -167,7 +167,7 @@ static void flash_printqry (struct cfi_qry *qry)
 uchar flash_read_uchar (struct flash_info *info, uint offset)
 {
 	uchar *cp = flash_make_addr(info, 0, offset);
-#if __BYTE_ORDER == __LITTLE_ENDIAN
+#ifdef __LITTLE_ENDIAN
 	return flash_read8(cp);
 #else
 	return flash_read8(cp + info->portwidth - 1);
@@ -195,7 +195,7 @@ static ulong flash_read_long (struct flash_info *info, flash_sect_t sect, uint o
 		debug ("addr[%x] = 0x%x\n", x, flash_read8(addr + x));
 	}
 #endif
-#if __BYTE_ORDER == __LITTLE_ENDIAN
+#ifdef __LITTLE_ENDIAN
 	retval = ((flash_read8(addr) << 16) |
 		  (flash_read8(addr + info->portwidth) << 24) |
 		  (flash_read8(addr + 2 * info->portwidth)) |
diff --git a/include/cramfs/cramfs_fs.h b/include/cramfs/cramfs_fs.h
index af2940b..a7e9504 100644
--- a/include/cramfs/cramfs_fs.h
+++ b/include/cramfs/cramfs_fs.h
@@ -88,7 +88,7 @@ struct cramfs_super {
 #error "No byte order defined in __BYTE_ORDER"
 #endif
 
-#if __BYTE_ORDER == __LITTLE_ENDIAN
+#ifdef __LITTLE_ENDIAN
 #define CRAMFS_16(x)	(x)
 #define CRAMFS_24(x)	(x)
 #define CRAMFS_32(x)	(x)
@@ -96,7 +96,7 @@ struct cramfs_super {
 #define CRAMFS_GET_OFFSET(x)	((x)->offset)
 #define CRAMFS_SET_OFFSET(x,y)	((x)->offset = (y))
 #define CRAMFS_SET_NAMELEN(x,y) ((x)->namelen = (y))
-#elif __BYTE_ORDER ==__BIG_ENDIAN
+#elif defined(__BIG_ENDIAN)
 #ifdef __KERNEL__
 #define CRAMFS_16(x)	swab16(x)
 #define CRAMFS_24(x)	((swab32(x)) >> 8)
diff --git a/include/envfs.h b/include/envfs.h
index 67b8902..cb1c648 100644
--- a/include/envfs.h
+++ b/include/envfs.h
@@ -38,6 +38,11 @@ struct envfs_super {
 #error "No byte order defined in __BYTE_ORDER"
 #endif
 
+#if __BYTE_ORDER != __LITTLE_ENDIAN && __BYTE_ORDER != __BIG_ENDIAN
+#error "__BYTE_ORDER must be __LITTLE_ENDIAN or __BIG_ENDIAN"
+#endif
+
+#ifdef __LITTLE_ENDIAN
 #if __BYTE_ORDER == __LITTLE_ENDIAN
 #define ENVFS_16(x)	(x)
 #define ENVFS_24(x)	(x)
@@ -46,7 +51,11 @@ struct envfs_super {
 #define ENVFS_GET_OFFSET(x)	((x)->offset)
 #define ENVFS_SET_OFFSET(x,y)	((x)->offset = (y))
 #define ENVFS_SET_NAMELEN(x,y) ((x)->namelen = (y))
-#elif __BYTE_ORDER == __BIG_ENDIAN
+#endif /* __BYTE_ORDER == __LITTLE_ENDIAN */
+#endif /* __LITTLE_ENDIAN */
+
+#ifdef __BIG_ENDIAN
+#if __BYTE_ORDER == __BIG_ENDIAN
 #ifdef __KERNEL__
 #define ENVFS_16(x)	swab16(x)
 #define ENVFS_24(x)	((swab32(x)) >> 8)
@@ -60,9 +69,8 @@ struct envfs_super {
 #define ENVFS_GET_OFFSET(x)	ENVFS_32(((x)->offset))
 #define ENVFS_SET_NAMELEN(x,y)((x)->offset = ENVFS_32((y)))
 #define ENVFS_SET_OFFSET(x,y) ((x)->namelen = ENVFS_32((y)))
-#else
-#error "__BYTE_ORDER must be __LITTLE_ENDIAN or __BIG_ENDIAN"
-#endif
+#endif /* __BYTE_ORDER == __BIG_ENDIAN */
+#endif /* __BIG_ENDIAN */
 
 #endif /* _ENVFS_H */
 
diff --git a/include/linux/byteorder/generic.h b/include/linux/byteorder/generic.h
index aab8f4b..2d68d99 100644
--- a/include/linux/byteorder/generic.h
+++ b/include/linux/byteorder/generic.h
@@ -78,13 +78,6 @@
  *
  */
 
-#ifndef __LITTLE_ENDIAN
-#define __LITTLE_ENDIAN	1234
-#endif
-#ifndef __BIG_ENDIAN
-#define __BIG_ENDIAN	4321
-#endif
-
 #if defined(__KERNEL__)
 /*
  * inside the kernel, we can use nicknames;
diff --git a/include/usb/usb.h b/include/usb/usb.h
index f273983..e13d549 100644
--- a/include/usb/usb.h
+++ b/include/usb/usb.h
@@ -271,7 +271,7 @@ void usb_rescan(void);
 		((x_ & 0xFF000000UL) >> 24)); \
 	})
 
-#if __BYTE_ORDER == __LITTLE_ENDIAN
+#ifdef __LITTLE_ENDIAN
 # define swap_16(x) (x)
 # define swap_32(x) (x)
 #else
-- 
1.7.10


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Re: [PATCH v2 1/5] byteorder: fix {BIG,LITTLE}_ENDIAN defines

[Sascha Hauer]

On Thu, Jun 28, 2012 at 10:32:30PM +0400, Antony Pavlov wrote:
> In the Linux kernel sources the only one byteorder macro
> can be defined (__BIG_ENDIAN or __LITTLE_ENDIAN) at a time.
> 
> In barebox we have the __BIG_ENDIAN and __LITTLE_ENDIAN macros
> defined simultaneously introduced in
> 
>     commit 9ad1fe64abb12baac918ec177d9a52bbf2980d16
>     Author: Baruch Siach <baruch@tkos.co.il>
>     Date:   Sun Jun 27 08:46:05 2010 +0300
> 
>       byteorder: add missing {BIG,LITTLE}_ENDIAN defines
> 
>       This fixes build warnings when testing __BYTE_ORDER
>       of the other kin
> 
> But in arch/mips/lib/libgcc.h (from Linux) we have
> 
>  #ifdef __BIG_ENDIAN
>  struct DWstruct {
>          int high, low;
>  };
>  #elif defined(__LITTLE_ENDIAN)
>  struct DWstruct {
>          int low, high;
>  };
>  #else
>  #error I feel sick.
>  #endif
> 
> This means that regardless of current byteorder the big-endian
> DWstruct will be selected. By turn this breaks the __lshrdi3()
> function and the clocksource code on little-endian MIPS.
> 
> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> ---
>  drivers/ata/disk_ata_drive.c      |    2 +-
>  drivers/nor/cfi_flash.c           |    6 +++---
>  include/cramfs/cramfs_fs.h        |    4 ++--
>  include/envfs.h                   |   16 ++++++++++++----
>  include/linux/byteorder/generic.h |    7 -------
>  include/usb/usb.h                 |    2 +-
>  6 files changed, 19 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/ata/disk_ata_drive.c b/drivers/ata/disk_ata_drive.c
> index 4602af3..d5c5837 100644
> --- a/drivers/ata/disk_ata_drive.c
> +++ b/drivers/ata/disk_ata_drive.c
> @@ -231,7 +231,7 @@ static void __maybe_unused ata_dump_id(uint16_t *id)
>   */
>  static void ata_fix_endianess(uint16_t *buf, unsigned wds)
>  {
> -#if __BYTE_ORDER == __BIG_ENDIAN
> +#ifdef __BIG_ENDIAN
>  	unsigned u;
>  
>  	for (u = 0; u < wds; u++)
> diff --git a/drivers/nor/cfi_flash.c b/drivers/nor/cfi_flash.c
> index 654e647..02340e6 100644
> --- a/drivers/nor/cfi_flash.c
> +++ b/drivers/nor/cfi_flash.c
> @@ -82,7 +82,7 @@ static void flash_add_byte (struct flash_info *info, cfiword_t * cword, uchar c)
>  		return;
>  	}
>  
> -#if __BYTE_ORDER == __BIG_ENDIAN
> +#ifdef __BIG_ENDIAN
>  	*cword = (*cword << 8) | c;
>  #else
>  
> @@ -167,7 +167,7 @@ static void flash_printqry (struct cfi_qry *qry)
>  uchar flash_read_uchar (struct flash_info *info, uint offset)
>  {
>  	uchar *cp = flash_make_addr(info, 0, offset);
> -#if __BYTE_ORDER == __LITTLE_ENDIAN
> +#ifdef __LITTLE_ENDIAN
>  	return flash_read8(cp);
>  #else
>  	return flash_read8(cp + info->portwidth - 1);
> @@ -195,7 +195,7 @@ static ulong flash_read_long (struct flash_info *info, flash_sect_t sect, uint o
>  		debug ("addr[%x] = 0x%x\n", x, flash_read8(addr + x));
>  	}
>  #endif
> -#if __BYTE_ORDER == __LITTLE_ENDIAN
> +#ifdef __LITTLE_ENDIAN
>  	retval = ((flash_read8(addr) << 16) |
>  		  (flash_read8(addr + info->portwidth) << 24) |
>  		  (flash_read8(addr + 2 * info->portwidth)) |
> diff --git a/include/cramfs/cramfs_fs.h b/include/cramfs/cramfs_fs.h
> index af2940b..a7e9504 100644
> --- a/include/cramfs/cramfs_fs.h
> +++ b/include/cramfs/cramfs_fs.h
> @@ -88,7 +88,7 @@ struct cramfs_super {
>  #error "No byte order defined in __BYTE_ORDER"
>  #endif
>  
> -#if __BYTE_ORDER == __LITTLE_ENDIAN
> +#ifdef __LITTLE_ENDIAN
>  #define CRAMFS_16(x)	(x)
>  #define CRAMFS_24(x)	(x)
>  #define CRAMFS_32(x)	(x)
> @@ -96,7 +96,7 @@ struct cramfs_super {
>  #define CRAMFS_GET_OFFSET(x)	((x)->offset)
>  #define CRAMFS_SET_OFFSET(x,y)	((x)->offset = (y))
>  #define CRAMFS_SET_NAMELEN(x,y) ((x)->namelen = (y))
> -#elif __BYTE_ORDER ==__BIG_ENDIAN
> +#elif defined(__BIG_ENDIAN)
>  #ifdef __KERNEL__
>  #define CRAMFS_16(x)	swab16(x)
>  #define CRAMFS_24(x)	((swab32(x)) >> 8)
> diff --git a/include/envfs.h b/include/envfs.h
> index 67b8902..cb1c648 100644
> --- a/include/envfs.h
> +++ b/include/envfs.h
> @@ -38,6 +38,11 @@ struct envfs_super {
>  #error "No byte order defined in __BYTE_ORDER"
>  #endif
>  
> +#if __BYTE_ORDER != __LITTLE_ENDIAN && __BYTE_ORDER != __BIG_ENDIAN
> +#error "__BYTE_ORDER must be __LITTLE_ENDIAN or __BIG_ENDIAN"
> +#endif

On Big Endian systems __LITTLE_ENDIAN is undefined and this results in:

In file included from common/environment.c:37:
include/envfs.h:41:21: warning: "__LITTLE_ENDIAN" is not defined

> +
> +#ifdef __LITTLE_ENDIAN

As said, this file is included from scripts/bareboxenv.c which is
compiled for userspace. __LITTLE_ENDIAN will always be defined in
userspace.

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: [PATCH v2 1/5] byteorder: fix {BIG,LITTLE}_ENDIAN defines

[Sascha Hauer]

On Fri, Jun 29, 2012 at 09:25:17AM +0200, Sascha Hauer wrote:
> >  
> > +#if __BYTE_ORDER != __LITTLE_ENDIAN && __BYTE_ORDER != __BIG_ENDIAN
> > +#error "__BYTE_ORDER must be __LITTLE_ENDIAN or __BIG_ENDIAN"
> > +#endif
> 
> On Big Endian systems __LITTLE_ENDIAN is undefined and this results in:
> 
> In file included from common/environment.c:37:
> include/envfs.h:41:21: warning: "__LITTLE_ENDIAN" is not defined

In the meantime I applied my original patch. Please let me know if there
is something wrong with it, we can still change it.

Sascha


-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: [PATCH v2 1/5] byteorder: fix {BIG,LITTLE}_ENDIAN defines

[Antony Pavlov]

On 29 June 2012 11:25, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> On Thu, Jun 28, 2012 at 10:32:30PM +0400, Antony Pavlov wrote:
>> In the Linux kernel sources the only one byteorder macro
>> can be defined (__BIG_ENDIAN or __LITTLE_ENDIAN) at a time.
>>
>> In barebox we have the __BIG_ENDIAN and __LITTLE_ENDIAN macros
>> defined simultaneously introduced in
>>
>>     commit 9ad1fe64abb12baac918ec177d9a52bbf2980d16
>>     Author: Baruch Siach <baruch@tkos.co.il>
>>     Date:   Sun Jun 27 08:46:05 2010 +0300
>>
>>       byteorder: add missing {BIG,LITTLE}_ENDIAN defines
>>
>>       This fixes build warnings when testing __BYTE_ORDER
>>       of the other kin
>>
>> But in arch/mips/lib/libgcc.h (from Linux) we have
>>
>>  #ifdef __BIG_ENDIAN
>>  struct DWstruct {
>>          int high, low;
>>  };
>>  #elif defined(__LITTLE_ENDIAN)
>>  struct DWstruct {
>>          int low, high;
>>  };
>>  #else
>>  #error I feel sick.
>>  #endif
>>
>> This means that regardless of current byteorder the big-endian
>> DWstruct will be selected. By turn this breaks the __lshrdi3()
>> function and the clocksource code on little-endian MIPS.
>>
>> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
>> ---
>>  drivers/ata/disk_ata_drive.c      |    2 +-
>>  drivers/nor/cfi_flash.c           |    6 +++---
>>  include/cramfs/cramfs_fs.h        |    4 ++--
>>  include/envfs.h                   |   16 ++++++++++++----
>>  include/linux/byteorder/generic.h |    7 -------
>>  include/usb/usb.h                 |    2 +-
>>  6 files changed, 19 insertions(+), 18 deletions(-)
>>
>> diff --git a/drivers/ata/disk_ata_drive.c b/drivers/ata/disk_ata_drive.c
>> index 4602af3..d5c5837 100644
>> --- a/drivers/ata/disk_ata_drive.c
>> +++ b/drivers/ata/disk_ata_drive.c
>> @@ -231,7 +231,7 @@ static void __maybe_unused ata_dump_id(uint16_t *id)
>>   */
>>  static void ata_fix_endianess(uint16_t *buf, unsigned wds)
>>  {
>> -#if __BYTE_ORDER == __BIG_ENDIAN
>> +#ifdef __BIG_ENDIAN
>>       unsigned u;
>>
>>       for (u = 0; u < wds; u++)
>> diff --git a/drivers/nor/cfi_flash.c b/drivers/nor/cfi_flash.c
>> index 654e647..02340e6 100644
>> --- a/drivers/nor/cfi_flash.c
>> +++ b/drivers/nor/cfi_flash.c
>> @@ -82,7 +82,7 @@ static void flash_add_byte (struct flash_info *info, cfiword_t * cword, uchar c)
>>               return;
>>       }
>>
>> -#if __BYTE_ORDER == __BIG_ENDIAN
>> +#ifdef __BIG_ENDIAN
>>       *cword = (*cword << 8) | c;
>>  #else
>>
>> @@ -167,7 +167,7 @@ static void flash_printqry (struct cfi_qry *qry)
>>  uchar flash_read_uchar (struct flash_info *info, uint offset)
>>  {
>>       uchar *cp = flash_make_addr(info, 0, offset);
>> -#if __BYTE_ORDER == __LITTLE_ENDIAN
>> +#ifdef __LITTLE_ENDIAN
>>       return flash_read8(cp);
>>  #else
>>       return flash_read8(cp + info->portwidth - 1);
>> @@ -195,7 +195,7 @@ static ulong flash_read_long (struct flash_info *info, flash_sect_t sect, uint o
>>               debug ("addr[%x] = 0x%x\n", x, flash_read8(addr + x));
>>       }
>>  #endif
>> -#if __BYTE_ORDER == __LITTLE_ENDIAN
>> +#ifdef __LITTLE_ENDIAN
>>       retval = ((flash_read8(addr) << 16) |
>>                 (flash_read8(addr + info->portwidth) << 24) |
>>                 (flash_read8(addr + 2 * info->portwidth)) |
>> diff --git a/include/cramfs/cramfs_fs.h b/include/cramfs/cramfs_fs.h
>> index af2940b..a7e9504 100644
>> --- a/include/cramfs/cramfs_fs.h
>> +++ b/include/cramfs/cramfs_fs.h
>> @@ -88,7 +88,7 @@ struct cramfs_super {
>>  #error "No byte order defined in __BYTE_ORDER"
>>  #endif
>>
>> -#if __BYTE_ORDER == __LITTLE_ENDIAN
>> +#ifdef __LITTLE_ENDIAN
>>  #define CRAMFS_16(x) (x)
>>  #define CRAMFS_24(x) (x)
>>  #define CRAMFS_32(x) (x)
>> @@ -96,7 +96,7 @@ struct cramfs_super {
>>  #define CRAMFS_GET_OFFSET(x) ((x)->offset)
>>  #define CRAMFS_SET_OFFSET(x,y)       ((x)->offset = (y))
>>  #define CRAMFS_SET_NAMELEN(x,y) ((x)->namelen = (y))
>> -#elif __BYTE_ORDER ==__BIG_ENDIAN
>> +#elif defined(__BIG_ENDIAN)
>>  #ifdef __KERNEL__
>>  #define CRAMFS_16(x) swab16(x)
>>  #define CRAMFS_24(x) ((swab32(x)) >> 8)
>> diff --git a/include/envfs.h b/include/envfs.h
>> index 67b8902..cb1c648 100644
>> --- a/include/envfs.h
>> +++ b/include/envfs.h
>> @@ -38,6 +38,11 @@ struct envfs_super {
>>  #error "No byte order defined in __BYTE_ORDER"
>>  #endif
>>
>> +#if __BYTE_ORDER != __LITTLE_ENDIAN && __BYTE_ORDER != __BIG_ENDIAN
>> +#error "__BYTE_ORDER must be __LITTLE_ENDIAN or __BIG_ENDIAN"
>> +#endif
>
> On Big Endian systems __LITTLE_ENDIAN is undefined and this results in:
>
> In file included from common/environment.c:37:
> include/envfs.h:41:21: warning: "__LITTLE_ENDIAN" is not defined

You are right.

>> +
>> +#ifdef __LITTLE_ENDIAN
>
> As said, this file is included from scripts/bareboxenv.c which is
> compiled for userspace. __LITTLE_ENDIAN will always be defined in
> userspace.

But it included from common/environment.c too!

Moreover, in my company there is Processor Core Testing Department.
These folks like to rebuild full MIPS Linux distribution on our
big-endian MIPS system natively just for testing purposes. So, I have
a chance to build MIPS barebox on big-endian system :))

>
> --
> Pengutronix e.K.                           |                             |
> Industrial Linux Solutions                 | http://www.pengutronix.de/  |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |



-- 
Best regards,
  Antony Pavlov

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Re: [PATCH v2 1/5] byteorder: fix {BIG,LITTLE}_ENDIAN defines

[Sascha Hauer]

On Fri, Jun 29, 2012 at 12:48:23PM +0400, Antony Pavlov wrote:
> On 29 June 2012 11:25, Sascha Hauer <s.hauer@pengutronix.de> wrote:
> >
> > In file included from common/environment.c:37:
> > include/envfs.h:41:21: warning: "__LITTLE_ENDIAN" is not defined
> 
> You are right.
> 
> >> +
> >> +#ifdef __LITTLE_ENDIAN
> >
> > As said, this file is included from scripts/bareboxenv.c which is
> > compiled for userspace. __LITTLE_ENDIAN will always be defined in
> > userspace.
> 
> But it included from common/environment.c too!

That's why I have the following:

#ifdef __BAREBOX__
#  ifdef __LITTLE_ENDIAN
#    define ENVFS_ORDER_LITTLE
#  elif defined __BIG_ENDIAN
#    define ENVFS_ORDER_BIG
#  else
#    error "could not determine byte order"
#  endif
#else
#  if __BYTE_ORDER == __LITTLE_ENDIAN
#    define ENVFS_ORDER_LITTLE
#  elif __BYTE_ORDER == __BIG_ENDIAN
#    define ENVFS_ORDER_BIG
#  else
#    error "could not determine byte order"
#  endif
#endif

This should work as expected. Maybe the name ENVFS_ORDER_LITTLE and
ENVFS_ORDER_BIG are a bit confusing, should probably better ENVFS_ORDER_NATIVE
and ENVFS_ORDER_SWAP.

Sascha

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Pengutronix e.K.                           |                             |
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[PATCH v2 2/5] byteorder: add sanity check

[Antony Pavlov]

The Linux Kernel defines only one of __LITTLE_ENDIAN and
__BIG_ENDIAN. Endianess can then be tested with #ifdef __xx_ENDIAN.

Userspace always defined both __LITTLE_ENDIAN and __BIG_ENDIAN
and byteorder can then be tested with #if __BYTE_ORDER == __xx_ENDIAN.

As we tend to use a lot of Kernel code in barebox we use
the kernel way of determing the byte order. Make sure here
 that architecture code properly defines it.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 include/common.h |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/common.h b/include/common.h
index 9745aeb..ece3d13 100644
--- a/include/common.h
+++ b/include/common.h
@@ -241,4 +241,22 @@ static inline void barebox_banner(void) {}
 		(__x < 0) ? -__x : __x;         \
 	})
 
+/*
+ * sanity check. The Linux Kernel defines only one of __LITTLE_ENDIAN and
+ * __BIG_ENDIAN. Endianess can then be tested with #ifdef __xx_ENDIAN.
+ * Userspace always defined both __LITTLE_ENDIAN and __BIG_ENDIAN and
+ * byteorder can then be tested with #if __BYTE_ORDER == __xx_ENDIAN.
+ *
+ * As we tend to use a lot of Kernel code in barebox we use the kernel way of
+ * determing the byte order. Make sure here that architecture code properly
+ * defines it.
+ */
+#include <asm/byteorder.h>
+#if defined(__LITTLE_ENDIAN) && defined(__BIG_ENDIAN)
+#error "both __LITTLE_ENDIAN and __BIG_ENDIAN are defined"
+#endif
+#if !defined(__LITTLE_ENDIAN) && !defined(__BIG_ENDIAN)
+#error "None of __LITTLE_ENDIAN and __BIG_ENDIAN are defined"
+#endif
+
 #endif	/* __COMMON_H_ */
-- 
1.7.10


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[PATCH v2 3/5] clocksource: move the NSEC_PER_SEC constant to common header

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/ppc/mach-mpc85xx/include/mach/clocks.h |    2 --
 include/clock.h                             |    2 ++
 include/linux/time.h                        |    1 +
 3 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/ppc/mach-mpc85xx/include/mach/clocks.h b/arch/ppc/mach-mpc85xx/include/mach/clocks.h
index 9477168..2ab367b 100644
--- a/arch/ppc/mach-mpc85xx/include/mach/clocks.h
+++ b/arch/ppc/mach-mpc85xx/include/mach/clocks.h
@@ -10,8 +10,6 @@ struct sys_info {
 	unsigned long freqLocalBus;
 };
 
-#define NSEC_PER_SEC	1000000000L
-
 unsigned long fsl_get_bus_freq(ulong dummy);
 unsigned long fsl_get_timebase_clock(void);
 void fsl_get_sys_info(struct sys_info *sysInfo);
diff --git a/include/clock.h b/include/clock.h
index 123f874..c01a8d0 100644
--- a/include/clock.h
+++ b/include/clock.h
@@ -3,6 +3,8 @@
 #ifndef CLOCK_H
 #define CLOCK_H
 
+#include <linux/time.h>
+
 #define CLOCKSOURCE_MASK(bits) (uint64_t)((bits) < 64 ? ((1ULL<<(bits))-1) : -1)
 
 struct clocksource {
diff --git a/include/linux/time.h b/include/linux/time.h
index bf12b99..a1be8fe 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -9,6 +9,7 @@
 
 #define _REENT_ONLY
 
+#define NSEC_PER_SEC	1000000000L
 #define SECSPERMIN	60L
 #define MINSPERHOUR	60L
 #define HOURSPERDAY	24L
-- 
1.7.10


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Re: [PATCH v2 3/5] clocksource: move the NSEC_PER_SEC constant to common header

[Sascha Hauer]

On Thu, Jun 28, 2012 at 10:32:32PM +0400, Antony Pavlov wrote:
> Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> ---
>  arch/ppc/mach-mpc85xx/include/mach/clocks.h |    2 --
>  include/clock.h                             |    2 ++
>  include/linux/time.h                        |    1 +
>  3 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/ppc/mach-mpc85xx/include/mach/clocks.h b/arch/ppc/mach-mpc85xx/include/mach/clocks.h
> index 9477168..2ab367b 100644
> --- a/arch/ppc/mach-mpc85xx/include/mach/clocks.h
> +++ b/arch/ppc/mach-mpc85xx/include/mach/clocks.h
> @@ -10,8 +10,6 @@ struct sys_info {
>  	unsigned long freqLocalBus;
>  };
>  
> -#define NSEC_PER_SEC	1000000000L
> -
>  unsigned long fsl_get_bus_freq(ulong dummy);
>  unsigned long fsl_get_timebase_clock(void);
>  void fsl_get_sys_info(struct sys_info *sysInfo);
> diff --git a/include/clock.h b/include/clock.h
> index 123f874..c01a8d0 100644
> --- a/include/clock.h
> +++ b/include/clock.h
> @@ -3,6 +3,8 @@
>  #ifndef CLOCK_H
>  #define CLOCK_H
>  
> +#include <linux/time.h>

This breaks compilation on some ARM boards:

In file included from include/clock.h:6:0,
                 from drivers/i2c/i2c.c:19:
include/linux/time.h: In function 'asctime_r':
include/linux/time.h:62:5: warning: implicit declaration of function
'sprintf' [-Wimplicit-function-declaration]
In file included from include/clock.h:6:0,
                 from drivers/i2c/busses/i2c-imx.c:36:

I'll fold the following into this patch:

8<-----------------------------------------------------

include/linux/time.h: remove dead code

include/linux/time.h contains several unused functions derived from U-Boot
code. Since this is a file under include/linux/ it should contain only code
from the kernel, so remove all this.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
---
 include/linux/time.h |  151 --------------------------------------------------
 1 file changed, 151 deletions(-)

diff --git a/include/linux/time.h b/include/linux/time.h
index a1be8fe..3942e82 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -3,157 +3,6 @@
 
 #include <linux/types.h>
 
-#define _DEFUN(a,b,c) a(c)
-#define _CONST const
-#define _AND ,
-
-#define _REENT_ONLY
-
 #define NSEC_PER_SEC	1000000000L
-#define SECSPERMIN	60L
-#define MINSPERHOUR	60L
-#define HOURSPERDAY	24L
-#define SECSPERHOUR	(SECSPERMIN * MINSPERHOUR)
-#define SECSPERDAY	(SECSPERHOUR * HOURSPERDAY)
-#define DAYSPERWEEK	7
-#define MONSPERYEAR	12
-
-#define YEAR_BASE	1900
-#define EPOCH_YEAR      1970
-#define EPOCH_WDAY      4
-
-#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
-
-
-/* Used by other time functions.  */
-struct tm {
-    int tm_sec;                   /* Seconds.     [0-60] (1 leap second) */
-    int tm_min;                   /* Minutes.     [0-59] */
-    int tm_hour;                  /* Hours.       [0-23] */
-    int tm_mday;                  /* Day.         [1-31] */
-    int tm_mon;                   /* Month.       [0-11] */
-    int tm_year;                  /* Year - 1900.  */
-    int tm_wday;                  /* Day of week. [0-6] */
-    int tm_yday;                  /* Days in year.[0-365] */
-    int tm_isdst;                 /* DST.         [-1/0/1]*/
-
-# ifdef __USE_BSD
-    long int tm_gmtoff;           /* Seconds east of UTC.  */
-    __const char *tm_zone;        /* Timezone abbreviation.  */
-# else
-    long int __tm_gmtoff;         /* Seconds east of UTC.  */
-    __const char *__tm_zone;      /* Timezone abbreviation.  */
-# endif
-};
-
-static inline char *
-_DEFUN (asctime_r, (tim_p, result),
-	_CONST struct tm *tim_p _AND
-	char *result)
-{
-    static _CONST char day_name[7][3] = {
-	"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
-    };
-    static _CONST char mon_name[12][3] = {
-	"Jan", "Feb", "Mar", "Apr", "May", "Jun",
-	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
-    };
-
-    sprintf (result, "%.3s %.3s %.2d %.2d:%.2d:%.2d %d\n",
-	    day_name[tim_p->tm_wday],
-	    mon_name[tim_p->tm_mon],
-	    tim_p->tm_mday, tim_p->tm_hour, tim_p->tm_min,
-	    tim_p->tm_sec, 1900 + tim_p->tm_year);
-    return result;
-}
-
-static inline struct tm *
-_DEFUN (localtime_r, (tim_p, res),
-	_CONST time_t * tim_p _AND
-	struct tm *res)
-{
-    static _CONST int mon_lengths[2][MONSPERYEAR] = {
-      {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
-      {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
-    } ;
-
-    static _CONST int year_lengths[2] = {
-      365,
-      366
-    } ;
-
-    long days, rem;
-    int y;
-    int yleap;
-    _CONST int *ip;
-
-    days = ((long) *tim_p) / SECSPERDAY;
-    rem = ((long) *tim_p) % SECSPERDAY;
-    while (rem < 0)
-    {
-	rem += SECSPERDAY;
-	--days;
-    }
-    while (rem >= SECSPERDAY)
-    {
-	rem -= SECSPERDAY;
-	++days;
-    }
-
-    /* compute hour, min, and sec */
-    res->tm_hour = (int) (rem / SECSPERHOUR);
-    rem %= SECSPERHOUR;
-    res->tm_min = (int) (rem / SECSPERMIN);
-    res->tm_sec = (int) (rem % SECSPERMIN);
-
-    /* compute day of week */
-    if ((res->tm_wday = ((EPOCH_WDAY + days) % DAYSPERWEEK)) < 0)
-	res->tm_wday += DAYSPERWEEK;
-
-    /* compute year & day of year */
-    y = EPOCH_YEAR;
-    if (days >= 0)
-    {
-	for (;;)
-	{
-	    yleap = isleap(y);
-	    if (days < year_lengths[yleap])
-		break;
-	    y++;
-	    days -= year_lengths[yleap];
-	}
-    }
-    else
-    {
-	do
-	{
-	    --y;
-	    yleap = isleap(y);
-	    days += year_lengths[yleap];
-	} while (days < 0);
-    }
-
-    res->tm_year = y - YEAR_BASE;
-    res->tm_yday = days;
-    ip = mon_lengths[yleap];
-    for (res->tm_mon = 0; days >= ip[res->tm_mon]; ++res->tm_mon)
-	days -= ip[res->tm_mon];
-    res->tm_mday = days + 1;
-
-    /* set daylight saving time flag */
-    res->tm_isdst = -1;
-
-    return (res);
-}
-
-static inline char *
-_DEFUN (ctime_r, (tim_p, result),
-	_CONST time_t * tim_p _AND
-	char * result)
-
-{
-    struct tm tm;
-    return asctime_r (localtime_r (tim_p, &tm), result);
-}
 
 #endif
-- 
1.7.10

-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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[PATCH v2 4/5] MIPS: XBurst: fix the JZ4755's clocksource input frequency value

[Antony Pavlov]

The 40 KHz frequency value was used to parry
__lshrdi3() error on little-endian MIPS because
the __lshrdi3() function is used in clocksource code.

The true value of the JZ4755's external clock frequency is 24 MHz.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/mips/mach-xburst/csrc-jz4750.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/mach-xburst/csrc-jz4750.c b/arch/mips/mach-xburst/csrc-jz4750.c
index f625b70..dc7135a 100644
--- a/arch/mips/mach-xburst/csrc-jz4750.c
+++ b/arch/mips/mach-xburst/csrc-jz4750.c
@@ -28,7 +28,7 @@
 #include <io.h>
 #include <mach/jz4750d_regs.h>
 
-#define JZ_TIMER_CLOCK 40000
+#define JZ_TIMER_CLOCK 24000000
 
 static uint64_t jz4750_cs_read(void)
 {
-- 
1.7.10


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[PATCH v2 5/5] MIPS: XBurst: use clocks_calc_mult_shift() for JZ4755's clocksource

[Antony Pavlov]

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/mips/mach-xburst/csrc-jz4750.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/mips/mach-xburst/csrc-jz4750.c b/arch/mips/mach-xburst/csrc-jz4750.c
index dc7135a..36e401e 100644
--- a/arch/mips/mach-xburst/csrc-jz4750.c
+++ b/arch/mips/mach-xburst/csrc-jz4750.c
@@ -38,12 +38,13 @@ static uint64_t jz4750_cs_read(void)
 static struct clocksource jz4750_cs = {
 	.read	= jz4750_cs_read,
 	.mask   = CLOCKSOURCE_MASK(32),
-	.shift  = 10,
 };
 
 static int clocksource_init(void)
 {
-	jz4750_cs.mult = clocksource_hz2mult(JZ_TIMER_CLOCK, jz4750_cs.shift);
+	clocks_calc_mult_shift(&jz4750_cs.mult, &jz4750_cs.shift,
+		JZ_TIMER_CLOCK, NSEC_PER_SEC, 10);
+
 	init_clock(&jz4750_cs);
 
 	__raw_writel(TCU_OSTCSR_PRESCALE1 | TCU_OSTCSR_EXT_EN,
-- 
1.7.10


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