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authorStephen Warren <swarren@wwwdotorg.org>2015-03-24 20:07:33 -0600
committerMarek Vasut <marex@denx.de>2015-04-14 05:47:59 +0200
commit927c1fa266ead17acb09e9397dbd33578f3ee267 (patch)
tree58a8b23869008d8a1b99bb2e33969095bbf4e53e /drivers
parentfc909c0563da20f3a564aa598dbe5966defabdcc (diff)
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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/Kconfig8
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.