linux-kernel - Re: [PATCH v10 4/5] QE/CPM: move muram management functions to qe

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Message-ID: <20150921225405.GB12709@home.buserror.net>
Date:	Mon, 21 Sep 2015 17:54:05 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Zhao Qiang <qiang.zhao@...escale.com>
CC:	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<lauraa@...eaurora.org>, <X.xie@...escale.com>,
	<benh@...nel.crashing.org>, <leoli@...escale.com>,
	<paulus@...ba.org>
Subject: Re: [PATCH v10 4/5] QE/CPM: move muram management functions to
 qe_common

On Fri, Sep 18, 2015 at 03:15:20PM +0800, Zhao Qiang wrote:
> QE and CPM have the same muram, they use the same management
> functions. Now QE support both ARM and PowerPC, it is necessary
> to move QE to "driver/soc", so move the muram management functions
> from cpm_common to qe_common for preparing to move QE code to "driver/soc"
> 
> Signed-off-by: Zhao Qiang <qiang.zhao@...escale.com>
> ---
> Changes for v2:
> 	- no changes
> Changes for v3:
> 	- no changes
> Changes for v4:
> 	- no changes
> Changes for v5:
> 	- no changes
> Changes for v6:
> 	- using genalloc instead rheap to manage QE MURAM
> 	- remove qe_reset from platform file, using 
> 	- subsys_initcall to call qe_init function.

Why is the init change in the same patch as moving the muram code?

> Changes for v7:
> 	- move this patch from 3/3 to 2/3
> 	- convert cpm with genalloc
> 	- check for gen_pool allocation failure
> Changes for v8:
> 	- rebase
> 	- move BD_SC_* macro instead of copy
> Changes for v9:
> 	- doesn't modify CPM, add a new patch to modify.
> 	- rebase
> Changes for v10:
> 	- rebase
> 
>  arch/powerpc/include/asm/cpm.h            |  59 --------
>  arch/powerpc/include/asm/qe.h             |  51 ++++++-
>  arch/powerpc/platforms/83xx/km83xx.c      |   2 -
>  arch/powerpc/platforms/83xx/mpc832x_mds.c |   2 -
>  arch/powerpc/platforms/83xx/mpc832x_rdb.c |   2 -
>  arch/powerpc/platforms/83xx/mpc836x_mds.c |   2 -
>  arch/powerpc/platforms/83xx/mpc836x_rdk.c |   3 -
>  arch/powerpc/platforms/85xx/common.c      |   1 -
>  arch/powerpc/sysdev/cpm_common.c          | 206 +------------------------
>  arch/powerpc/sysdev/qe_lib/Makefile       |   2 +-
>  arch/powerpc/sysdev/qe_lib/qe.c           |  15 ++
>  arch/powerpc/sysdev/qe_lib/qe_common.c    | 242 ++++++++++++++++++++++++++++++
>  12 files changed, 302 insertions(+), 285 deletions(-)
>  create mode 100644 arch/powerpc/sysdev/qe_lib/qe_common.c
> 
> diff --git a/arch/powerpc/include/asm/cpm.h b/arch/powerpc/include/asm/cpm.h
> index 4398a6c..003a736 100644
> --- a/arch/powerpc/include/asm/cpm.h
> +++ b/arch/powerpc/include/asm/cpm.h
> @@ -93,22 +93,6 @@ typedef struct cpm_buf_desc {
>   */
>  
>  #define BD_SC_EMPTY	(0x8000)	/* Receive is empty */
> -#define BD_SC_READY	(0x8000)	/* Transmit is ready */
> -#define BD_SC_WRAP	(0x2000)	/* Last buffer descriptor */
> -#define BD_SC_INTRPT	(0x1000)	/* Interrupt on change */
> -#define BD_SC_LAST	(0x0800)	/* Last buffer in frame */
> -#define BD_SC_TC	(0x0400)	/* Transmit CRC */
> -#define BD_SC_CM	(0x0200)	/* Continuous mode */
> -#define BD_SC_ID	(0x0100)	/* Rec'd too many idles */
> -#define BD_SC_P		(0x0100)	/* xmt preamble */
> -#define BD_SC_BR	(0x0020)	/* Break received */
> -#define BD_SC_FR	(0x0010)	/* Framing error */
> -#define BD_SC_PR	(0x0008)	/* Parity error */
> -#define BD_SC_NAK	(0x0004)	/* NAK - did not respond */
> -#define BD_SC_OV	(0x0002)	/* Overrun */
> -#define BD_SC_UN	(0x0002)	/* Underrun */
> -#define BD_SC_CD	(0x0001)	/* */
> -#define BD_SC_CL	(0x0001)	/* Collision */

What does this have to do with muram?

> -/* we actually use cpm_muram implementation, define this for convenience */
> -#define qe_muram_init cpm_muram_init
> -#define qe_muram_alloc cpm_muram_alloc
> -#define qe_muram_alloc_fixed cpm_muram_alloc_fixed
> -#define qe_muram_free cpm_muram_free
> -#define qe_muram_addr cpm_muram_addr
> -#define qe_muram_offset cpm_muram_offset
> +/* we actually use qe_muram implementation, define this for convenience */
> +#define cpm_muram_init qe_muram_init
> +#define cpm_muram_alloc qe_muram_alloc
> +#define cpm_muram_alloc_fixed qe_muram_alloc_fixed
> +#define cpm_muram_free qe_muram_free
> +#define cpm_muram_addr qe_muram_addr
> +#define cpm_muram_offset qe_muram_offset

I've said many times now that any changes to the code, including renaming
functions, needs to be a separate patch from moving the code.

-Scott
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