On 02/28/2015 06:00 PM, Paul Bolle wrote: > On Tue, 2015-02-24 at 16:21 +0200, Peter Ujfalusi wrote: >> The DRA7x has more peripherals with DMA requests than the sDMA can handle: >> 205 vs 127. All DMA requests are routed through the DMA crossbar, which can >> be configured to route selected incoming DMA requests to specific sDMA >> request. >> >> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx> >> --- >> drivers/dma/Kconfig | 4 + >> drivers/dma/Makefile | 1 + >> drivers/dma/ti-dma-crossbar.c | 191 ++++++++++++++++++++++++++++++++++++++++++ >> 3 files changed, 196 insertions(+) >> create mode 100644 drivers/dma/ti-dma-crossbar.c > > A simple observation follows. > >> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig >> index a874b6ec6650..dfe72a0f46dc 100644 >> --- a/drivers/dma/Kconfig >> +++ b/drivers/dma/Kconfig >> @@ -245,6 +245,9 @@ config TI_EDMA >> Enable support for the TI EDMA controller. This DMA >> engine is found on TI DaVinci and AM33xx parts. >> >> +config TI_DMA_CROSSBAR >> + bool >> + > > This is a bool symbol... > >> config ARCH_HAS_ASYNC_TX_FIND_CHANNEL >> bool >> >> @@ -330,6 +333,7 @@ config DMA_OMAP >> depends on ARCH_OMAP >> select DMA_ENGINE >> select DMA_VIRTUAL_CHANNELS >> + select TI_DMA_CROSSBAR if SOC_DRA7XX >> >> config DMA_BCM2835 >> tristate "BCM2835 DMA engine support" >> diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile >> index f915f61ec574..bc12f9a4e62b 100644 >> --- a/drivers/dma/Makefile >> +++ b/drivers/dma/Makefile >> @@ -38,6 +38,7 @@ obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o >> obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o >> obj-$(CONFIG_MMP_TDMA) += mmp_tdma.o >> obj-$(CONFIG_DMA_OMAP) += omap-dma.o >> +obj-$(CONFIG_TI_DMA_CROSSBAR) += ti-dma-crossbar.o > > ... so this file will be either not built or built into the kernel... > >> obj-$(CONFIG_DMA_BCM2835) += bcm2835-dma.o >> obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o >> obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o >> diff --git a/drivers/dma/ti-dma-crossbar.c b/drivers/dma/ti-dma-crossbar.c >> new file mode 100644 >> index 000000000000..bf01434df46a >> --- /dev/null >> +++ b/drivers/dma/ti-dma-crossbar.c >> @@ -0,0 +1,191 @@ >> +/* >> + * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com >> + * Author: Peter Ujfalusi <peter.ujfalusi@xxxxxx> >> + * >> + * This program is free software; you can redistribute it and/or modify >> + * it under the terms of the GNU General Public License version 2 as >> + * published by the Free Software Foundation. >> + * >> + */ >> +#include <linux/slab.h> >> +#include <linux/err.h> >> +#include <linux/init.h> >> +#include <linux/list.h> >> +#include <linux/io.h> >> +#include <linux/regmap.h> >> +#include <linux/idr.h> >> +#include <linux/of_address.h> >> +#include <linux/of_device.h> >> +#include <linux/of_dma.h> >> +#include <linux/module.h> > > ... this includes linux/module.h ... > > [...] > >> +static struct platform_driver ti_dma_xbar_driver = { >> + .probe = ti_dma_xbar_probe, >> + .driver = { >> + .name = "ti-dma-crossbar", >> + .owner = THIS_MODULE, > > ... is that needed to make this work? > >> + .of_match_table = of_match_ptr(ti_dma_xbar_match), >> + }, >> +}; >> + >> +int omap_dmaxbar_init(void) >> +{ >> + return platform_driver_register(&ti_dma_xbar_driver); >> +} >> +arch_initcall(omap_dmaxbar_init); >> + >> +MODULE_DESCRIPTION("TI DMA Crossbar"); >> +MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@xxxxxx>"); >> +MODULE_LICENSE("GPL"); > > And why are these three macros needed? > > By the way: there's a mismatch between the header (which is GPL v2) and > the MODULE_LICENSE() string (which means GPL v2 or later). True, the linux/module.h and the lines with *MODULE* in it is not needed in case the driver will be not built as module. I have not really thought about this to be honest, I have had these macros in most (all?) of the drivers I wrote. They will be gone in V2 of the series. Thanks, Péter -- To unsubscribe from this list: send the line "unsubscribe dmaengine" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
