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mmc: bcm2835: Add new driver for the sdhost controller. 

The 2835 has two SD controllers: The Arasan sdhci controller (supported
by the iproc driver) and a custom sdhost controller.  This patch adds a
driver for the latter.

The sdhci controller supports both sdcard and sdio.  The sdhost
controller supports the sdcard only, but has better performance.  Also
note that the rpi3 has sdio wifi, so driving the sdcard with the sdhost
controller allows to use the sdhci controller for wifi support.

The configuration is done by devicetree via pin muxing.  Both SD
controller are available on the same pins (2 pin groups = pin 22 to 27 +
pin 48 to 53).  So it's possible to use both SD controllers at the same
time with different pin groups.

The code was originally written by Phil Elwell in the downstream
Rasbperry Pi tree.   In preparation for the upstream merge it was
cleaned up and the code base was moderized by Eric Anholt, Stefan
Wahren and Gerd Hoffmann.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Eric Anholt 2017-03-08 10:19:03 +01:00 committed by Ulf Hansson
parent ebdb4d8e0d
commit 660fc733bd
3 changed files with 1480 additions and 0 deletions
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14
drivers/mmc/host/Kconfig
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@ -799,6 +799,20 @@ config MMC_TOSHIBA_PCI
depends on PCI
help
config MMC_BCM2835
tristate "Broadcom BCM2835 SDHOST MMC Controller support"
depends on ARCH_BCM2835 || COMPILE_TEST
depends on HAS_DMA
help
This selects the BCM2835 SDHOST MMC controller. If you have
a BCM2835 platform with SD or MMC devices, say Y or M here.
Note that the BCM2835 has two SD controllers: The Arasan
sdhci controller (supported by MMC_SDHCI_IPROC) and a custom
sdhost controller (supported by this driver).
If unsure, say N.
config MMC_MTK
tristate "MediaTek SD/MMC Card Interface support"
depends on HAS_DMA

1
drivers/mmc/host/Makefile
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@ -59,6 +59,7 @@ obj-$(CONFIG_MMC_MOXART) += moxart-mmc.o
obj-$(CONFIG_MMC_SUNXI) += sunxi-mmc.o
obj-$(CONFIG_MMC_USDHI6ROL0) += usdhi6rol0.o
obj-$(CONFIG_MMC_TOSHIBA_PCI) += toshsd.o
obj-$(CONFIG_MMC_BCM2835) += bcm2835.o
obj-$(CONFIG_MMC_REALTEK_PCI) += rtsx_pci_sdmmc.o
obj-$(CONFIG_MMC_REALTEK_USB) += rtsx_usb_sdmmc.o

1465
drivers/mmc/host/bcm2835.c Normal file
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