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| author | Stephen Warren <swarren@wwwdotorg.org> | 2015-03-24 20:07:33 -0600 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2015-04-14 05:47:59 +0200 |
| commit | 927c1fa266ead17acb09e9397dbd33578f3ee267 (patch) | |
| tree | 58a8b23869008d8a1b99bb2e33969095bbf4e53e /drivers | |
| parent | fc909c0563da20f3a564aa598dbe5966defabdcc (diff) | |
| download | u-boot-imx-927c1fa266ead17acb09e9397dbd33578f3ee267.zip u-boot-imx-927c1fa266ead17acb09e9397dbd33578f3ee267.tar.gz u-boot-imx-927c1fa266ead17acb09e9397dbd33578f3ee267.tar.bz2 | |
Create API to map between CPU physical and bus addresses
On some SoCs, DMA-capable peripherals see a different address space to
the CPU's physical address space. Create an API to allow platform-agnostic
drivers to convert between the two address spaces when programming DMA
operations.
This API will exist on all platforms, but will have a dummy implementation
when this feature is not required. Other platforms will enable
CONFIG_PHYS_TO_BUS and provide the required implementation.
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/Kconfig | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/Kconfig b/drivers/Kconfig index dcce532..941aa0c 100644 --- a/drivers/Kconfig +++ b/drivers/Kconfig @@ -53,3 +53,11 @@ source "drivers/crypto/Kconfig" source "drivers/thermal/Kconfig" endmenu + +config PHYS_TO_BUS + bool + help + Some SoCs use a different address map for CPU physical addresses and + peripheral DMA master accesses. If yours does, select this option in + your platform's Kconfig, and implement the appropriate mapping + functions in your platform's support code. |