summaryrefslogtreecommitdiff
path: root/common
diff options
context:
space:
mode:
authorPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>2018-11-30 22:13:25 +0100
committerTom Rini <trini@konsulko.com>2019-01-19 09:49:26 -0500
commit2acc24fc28ef782f4baef1aa0193d520ee9610b9 (patch)
tree73f102dd54eb73f1c005a4554d77f012eaa1dd23 /common
parent599fb3bc95894b48c606b133056ba2ba438f1ca0 (diff)
Kconfig: Migrate BOUNCE_BUFFER
The bounce buffer is used by a few drivers (most of the MMC drivers) to overcome limitations in their respective DMA implementation. This moves the configuration to Kconfig and makes it user-selectable (even though it will be a required feature to make those drivers work): the expected usage is for drivers depending on this to 'select' it unconditionally from their respective Kconfig (see follow-up patches). This commit includes a full migration using moveconfig.py to ensure that each commit compiles. To ensure bisectability we update dependencies of various drivers to now select BOUNCE_BUFFER when needed. [trini: Squash all patches to ensure bisectability] Signed-off-by: Tom Rini <trini@konsulko.com> Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com> Reviewed-by: Otavio Salvador <otavio@ossystems.com.br> [dw_mmc portion] Reviewed-by: Fabio Estevam <festevam@gmail.com> [mxsmmc portion] Reviewed-by: Simon Glass <sjg@chromium.org> [tegra portion]
Diffstat (limited to 'common')
-rw-r--r--common/Kconfig11
1 files changed, 11 insertions, 0 deletions
diff --git a/common/Kconfig b/common/Kconfig
index 2c017df4087..8f9d2959ba5 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -645,6 +645,17 @@ config DISPLAY_BOARDINFO_LATE
the relocation phase. The board function checkboard() is called to do
this.
+config BOUNCE_BUFFER
+ bool "Include bounce buffer API"
+ help
+ Some peripherals support DMA from a subset of physically
+ addressable memory only. To support such peripherals, the
+ bounce buffer API uses a temporary buffer: it copies data
+ to/from DMA regions while managing cache operations.
+
+ A second possible use of bounce buffers is their ability to
+ provide aligned buffers for DMA operations.
+
menu "Start-up hooks"
config ARCH_EARLY_INIT_R