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Date: Tue, 14 May 2024 09:57:09 +0200
From: Angelo Dureghello <angelo@...nel-space.org>
To: Geert Uytterhoeven <geert@...ux-m68k.org>, Frank Li <Frank.Li@....com>
Cc: Vinod Koul <vkoul@...nel.org>,
"open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM"
<dmaengine@...r.kernel.org>, open list <linux-kernel@...r.kernel.org>,
"open list:FREESCALE eDMA DRIVER" <imx@...ts.linux.dev>,
Greg Ungerer <gerg@...ux-m68k.org>,
linux-m68k <linux-m68k@...ts.linux-m68k.org>
Subject: Re: [PATCH 1/1] dmaengine: fsl-edma: merge mcf-edma into fsl-edma
driver
Hi,
On 13/05/24 8:12 PM, Geert Uytterhoeven wrote:
> CC coldfire
>
> On Thu, May 9, 2024 at 9:35 PM Frank Li <Frank.Li@....com> wrote:
>> MCF eDMA are almost the same as FSL eDMA driver. Previously link to two
>> kernel modules, fsl-edma.ko and mcf-edma.ko. These are not problem because
>> mcf-edma is for m68k ARCH and FSL eDMA is for arm/arm64 ARCH. But often
>> build both at PPC ARCH. It also makes sense to build two drivers at the
>> same time. It causes many build warning because share a fsl-edma-common.o.
>> such as:
>>
>> powerpc64le-linux-ld: warning: orphan section `.stubs' from `drivers/dma/fsl-edma-common.o' being placed in section `.stubs'
>> powerpc64le-linux-ld: warning: orphan section `.stubs' from `drivers/dma/fsl-edma-trace.o' being placed in section `.stubs'
>>
>> Merge mcf-edma into fsl-edma driver. So use one driver (fsl-edma.ko) for
>> MCF and FSL eDMA.
>>
>> mcf-edma.ko should be replaced by fsl-edma.ko in modules, minimizing user
>> space impact because MCF eDMA remains confined to legacy ColdFire mcf5441x
>> production and mcf5441x has been in production for at least a decade and
>> NXP has long ceased ColdFire development.
when i developed mcf-edma, i tried to modify fsl-edma first. Modules are
similar but there are various edma IP versions, and i remember minimal
differences in the CF version too, some register bits and, of course,
endianness.
If a merge is possible, welcome, i have here mcf5441x, can give a try to
this patch as soon as i can.
>> Update Kconfig to make MCF_EDMA as feature of FSL_EDMA and change Makefile
>> to link mcl-edma-main.o to fsl-edma.o.
>>
>> Create a common module init/exit functions, which call original's
>> fsl-edma-init[exit]() and mcf-edma-init[exit]().
>>
>> Reported-by: kernel test robot <lkp@...el.com>
>> Closes: https://lore.kernel.org/oe-kbuild-all/202405082029.Es9umH7n-lkp@intel.com/
>> Signed-off-by: Frank Li <Frank.Li@....com>
>> ---
>> drivers/dma/Kconfig | 8 ++++----
>> drivers/dma/Makefile | 5 ++---
>> drivers/dma/fsl-edma-common.c | 28 ++++++++++++++++++++++++++++
>> drivers/dma/fsl-edma-common.h | 5 +++++
>> drivers/dma/fsl-edma-main.c | 6 ++----
>> drivers/dma/mcf-edma-main.c | 6 ++----
>> 6 files changed, 43 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
>> index 002a5ec806207..45110520f6e68 100644
>> --- a/drivers/dma/Kconfig
>> +++ b/drivers/dma/Kconfig
>> @@ -393,14 +393,14 @@ config LS2X_APB_DMA
>> It does not support memory to memory data transfer.
>>
>> config MCF_EDMA
>> - tristate "Freescale eDMA engine support, ColdFire mcf5441x SoCs"
>> + bool "Freescale eDMA engine support, ColdFire mcf5441x SoCs"
>> depends on M5441x || COMPILE_TEST
>> select DMA_ENGINE
>> select DMA_VIRTUAL_CHANNELS
>> help
>> - Support the Freescale ColdFire eDMA engine, 64-channel
>> - implementation that performs complex data transfers with
>> - minimal intervention from a host processor.
>> + Support the Freescale ColdFire eDMA engine in FSL_EDMA driver,
>> + 64-channel implementation that performs complex data transfers
>> + with minimal intervention from a host processor.
>> This module can be found on Freescale ColdFire mcf5441x SoCs.
>>
>> config MILBEAUT_HDMAC
>> diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
>> index 802ca916f05f5..0000922c7cbfe 100644
>> --- a/drivers/dma/Makefile
>> +++ b/drivers/dma/Makefile
>> @@ -33,11 +33,10 @@ obj-$(CONFIG_DW_EDMA) += dw-edma/
>> obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o
>> fsl-edma-trace-$(CONFIG_TRACING) := fsl-edma-trace.o
>> CFLAGS_fsl-edma-trace.o := -I$(src)
>> +mcf-edma-main-$(CONFIG_MCF_EDMA) := mcf-edma-main.o
>> obj-$(CONFIG_FSL_DMA) += fsldma.o
>> -fsl-edma-objs := fsl-edma-main.o fsl-edma-common.o ${fsl-edma-trace-y}
>> +fsl-edma-objs := fsl-edma-main.o fsl-edma-common.o ${fsl-edma-trace-y} ${mcf-edma-main-y}
>> obj-$(CONFIG_FSL_EDMA) += fsl-edma.o
>> -mcf-edma-objs := mcf-edma-main.o fsl-edma-common.o ${fsl-edma-trace-y}
>> -obj-$(CONFIG_MCF_EDMA) += mcf-edma.o
>> obj-$(CONFIG_FSL_QDMA) += fsl-qdma.o
>> obj-$(CONFIG_FSL_RAID) += fsl_raid.o
>> obj-$(CONFIG_HISI_DMA) += hisi_dma.o
>> diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
>> index 3af4307873157..ac04a2ce4fa1f 100644
>> --- a/drivers/dma/fsl-edma-common.c
>> +++ b/drivers/dma/fsl-edma-common.c
>> @@ -888,4 +888,32 @@ void fsl_edma_setup_regs(struct fsl_edma_engine *edma)
>> }
>> }
>>
>> +static int __init fsl_edma_common_init(void)
>> +{
>> + int ret;
>> +
>> + ret = fsl_edma_init();
>> + if (ret)
>> + return ret;
>> +
>> +#ifdef CONFIG_MCF_EDMA
>> + ret = mcf_edma_init();
>> + if (ret)
>> + return ret;
>> +#endif
>> + return 0;
>> +}
>> +
>> +subsys_initcall(fsl_edma_common_init);
>> +
>> +static void __exit fsl_edma_common_exit(void)
>> +{
>> + fsl_edma_exit();
>> +
>> +#ifdef CONFIG_MCF_EDMA
>> + mcf_edma_exit();
>> +#endif
>> +}
>> +module_exit(fsl_edma_common_exit);
>> +
>> MODULE_LICENSE("GPL v2");
>> diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
>> index ac66222c16040..dfbdcc922ceea 100644
>> --- a/drivers/dma/fsl-edma-common.h
>> +++ b/drivers/dma/fsl-edma-common.h
>> @@ -488,4 +488,9 @@ void fsl_edma_free_chan_resources(struct dma_chan *chan);
>> void fsl_edma_cleanup_vchan(struct dma_device *dmadev);
>> void fsl_edma_setup_regs(struct fsl_edma_engine *edma);
>>
>> +int __init fsl_edma_init(void);
>> +void __exit fsl_edma_exit(void);
>> +int __init mcf_edma_init(void);
>> +void __exit mcf_edma_exit(void);
>> +
>> #endif /* _FSL_EDMA_COMMON_H_ */
>> diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c
>> index 391e4f13dfeb0..a1c3c4ed869c5 100644
>> --- a/drivers/dma/fsl-edma-main.c
>> +++ b/drivers/dma/fsl-edma-main.c
>> @@ -724,17 +724,15 @@ static struct platform_driver fsl_edma_driver = {
>> .remove_new = fsl_edma_remove,
>> };
>>
>> -static int __init fsl_edma_init(void)
>> +int __init fsl_edma_init(void)
>> {
>> return platform_driver_register(&fsl_edma_driver);
>> }
>> -subsys_initcall(fsl_edma_init);
>>
>> -static void __exit fsl_edma_exit(void)
>> +void __exit fsl_edma_exit(void)
>> {
>> platform_driver_unregister(&fsl_edma_driver);
>> }
>> -module_exit(fsl_edma_exit);
>>
>> MODULE_ALIAS("platform:fsl-edma");
>> MODULE_DESCRIPTION("Freescale eDMA engine driver");
>> diff --git a/drivers/dma/mcf-edma-main.c b/drivers/dma/mcf-edma-main.c
>> index 78c606f6d0026..d97991a1e9518 100644
>> --- a/drivers/dma/mcf-edma-main.c
>> +++ b/drivers/dma/mcf-edma-main.c
>> @@ -284,17 +284,15 @@ bool mcf_edma_filter_fn(struct dma_chan *chan, void *param)
>> }
>> EXPORT_SYMBOL(mcf_edma_filter_fn);
>>
>> -static int __init mcf_edma_init(void)
>> +int __init mcf_edma_init(void)
>> {
>> return platform_driver_register(&mcf_edma_driver);
>> }
>> -subsys_initcall(mcf_edma_init);
>>
>> -static void __exit mcf_edma_exit(void)
>> +void __exit mcf_edma_exit(void)
>> {
>> platform_driver_unregister(&mcf_edma_driver);
>> }
>> -module_exit(mcf_edma_exit);
>>
>> MODULE_ALIAS("platform:mcf-edma");
>> MODULE_DESCRIPTION("Freescale eDMA engine driver, ColdFire family");
>> --
>> 2.34.1
Regards,
angelo
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