Re: [PATCH 1/1] dmaengine: fsl-edma: merge mcf-edma into fsl-edma driver

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Hi,

On 14/05/24 6:16 PM, Frank Li wrote:
On Tue, May 14, 2024 at 09:57:09AM +0200, Angelo Dureghello wrote:
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@xxxxxxx> 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.
Thanks. I am not sure if recent eDMAv3 and eDMAv5 patch impact mcf5441.
eDMAv3 is quite big change. If you can test on mcf5441x, can I send to you
a futher clean up for mcf5441x?


sure


This patch are just simple glue two
driver together to avoid a build warning.




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@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202405082029.Es9umH7n-lkp@xxxxxxxxx/
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
   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

Regards,
angelo






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