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usb: musb: use a Kconfig choice to pick the right DMA method

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The logic to allow only one DMA driver in MUSB is currently
flawed, because it also allows picking no DMA driver at all
and also not selecting PIO mode.

Using a choice statement makes this foolproof for now and
also simplifies the Makefile.

Unfortunately, we will have to revisit this when we start
supporting multiple ARM platforms in a single kernel binary,
because at that point we will actually need to select
multiple DMA drivers and pick the right one at run-time.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Felipe Balbi <balbi@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Arnd Bergmann 2011-10-02 16:45:45 +02:00 committed by Felipe Balbi
parent e25bec1601
commit 2e7fc3ba68
2 changed files with 38 additions and 45 deletions
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57
drivers/usb/musb/Kconfig
View File

@ -65,46 +65,57 @@ config USB_MUSB_UX500
endchoice
config MUSB_PIO_ONLY
bool 'Disable DMA (always use PIO)'
depends on USB_MUSB_HDRC
default USB_MUSB_TUSB6010 || USB_MUSB_DA8XX || USB_MUSB_AM35X
choice
prompt 'MUSB DMA mode'
default USB_UX500_DMA if USB_MUSB_UX500
default USB_INVENTRA_DMA if USB_MUSB_OMAP2PLUS || USB_MUSB_BLACKFIN
default USB_TI_CPPI_DMA if USB_MUSB_DAVINCI
default USB_TUSB_OMAP_DMA if USB_MUSB_TUSB6010
default MUSB_PIO_ONLY if USB_MUSB_TUSB6010 || USB_MUSB_DA8XX || USB_MUSB_AM35X
help
All data is copied between memory and FIFO by the CPU.
DMA controllers are ignored.
Do not select 'n' here unless DMA support for your SOC or board
is unavailable (or unstable). When DMA is enabled at compile time,
you can still disable it at run time using the "use_dma=n" module
parameter.
Unfortunately, only one option can be enabled here. Ideally one
should be able to build all these drivers into one kernel to
allow using DMA on multiplatform kernels.
config USB_UX500_DMA
bool
depends on USB_MUSB_HDRC && !MUSB_PIO_ONLY
default USB_MUSB_UX500
bool 'ST Ericsson U8500 and U5500'
depends on USB_MUSB_HDRC
depends on USB_MUSB_UX500
help
Enable DMA transfers on UX500 platforms.
config USB_INVENTRA_DMA
bool
depends on USB_MUSB_HDRC && !MUSB_PIO_ONLY
default USB_MUSB_OMAP2PLUS || USB_MUSB_BLACKFIN
bool 'Inventra'
depends on USB_MUSB_HDRC
depends on USB_MUSB_OMAP2PLUS || USB_MUSB_BLACKFIN
help
Enable DMA transfers using Mentor's engine.
config USB_TI_CPPI_DMA
bool
depends on USB_MUSB_HDRC && !MUSB_PIO_ONLY
default USB_MUSB_DAVINCI
bool 'TI CPPI (Davinci)'
depends on USB_MUSB_HDRC
depends on USB_MUSB_DAVINCI
help
Enable DMA transfers when TI CPPI DMA is available.
config USB_TUSB_OMAP_DMA
bool
depends on USB_MUSB_HDRC && !MUSB_PIO_ONLY
bool 'TUSB 6010'
depends on USB_MUSB_HDRC
depends on USB_MUSB_TUSB6010
depends on ARCH_OMAP
default y
help
Enable DMA transfers on TUSB 6010 when OMAP DMA is available.
config MUSB_PIO_ONLY
bool 'Disable DMA (always use PIO)'
depends on USB_MUSB_HDRC
help
All data is copied between memory and FIFO by the CPU.
DMA controllers are ignored.
Do not choose this unless DMA support for your SOC or board
is unavailable (or unstable). When DMA is enabled at compile time,
you can still disable it at run time using the "use_dma=n" module
parameter.
endchoice

26
drivers/usb/musb/Makefile
View File

@ -24,25 +24,7 @@ obj-$(CONFIG_USB_MUSB_UX500) += ux500.o
# PIO only, or DMA (several potential schemes).
# though PIO is always there to back up DMA, and for ep0
ifneq ($(CONFIG_MUSB_PIO_ONLY),y)
ifeq ($(CONFIG_USB_INVENTRA_DMA),y)
musb_hdrc-y += musbhsdma.o
else
ifeq ($(CONFIG_USB_TI_CPPI_DMA),y)
musb_hdrc-y += cppi_dma.o
else
ifeq ($(CONFIG_USB_TUSB_OMAP_DMA),y)
musb_hdrc-y += tusb6010_omap.o
else
ifeq ($(CONFIG_USB_UX500_DMA),y)
musb_hdrc-y += ux500_dma.o
endif
endif
endif
endif
endif
musb_hdrc-$(CONFIG_USB_INVENTRA_DMA) += musbhsdma.o
musb_hdrc-$(CONFIG_USB_TI_CPPI_DMA) += cppi_dma.o
musb_hdrc-$(CONFIG_USB_TUSB_OMAP_DMA) += tusb6010_omap.o
musb_hdrc-$(CONFIG_USB_UX500_DMA) += ux500_dma.o