mmc: Add new VUB300 USB-to-SD/SDIO/MMC driver
Add a driver for Elan Digital System's VUB300 chip which is a USB
connected SDIO/SDmem/MMC host controller. A VUB300 chip enables a USB 2.0
or USB 1.1 connected host computer to use SDIO/SD/MMC cards without the
need for a directly connected, for example via PCI, SDIO host controller.
Signed-off-by: Anthony F Olech <tony.olech@elandigitalsystems.com>
[cjb: various punctuation and style fixes]
Tested-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index b981715..56dbf3f 100644
--- a/drivers/mmc/host/Kconfig
+++ b/drivers/mmc/host/Kconfig
@@ -535,6 +535,37 @@
If you have a board based on such a SoC and with a SD/MMC slot,
say Y or M here.
+config MMC_VUB300
+ tristate "VUB300 USB to SDIO/SD/MMC Host Controller support"
+ depends on USB
+ help
+ This selects support for Elan Digital Systems' VUB300 chip.
+
+ The VUB300 is a USB-SDIO Host Controller Interface chip
+ that enables the host computer to use SDIO/SD/MMC cards
+ via a USB 2.0 or USB 1.1 host.
+
+ The VUB300 chip will be found in both physically separate
+ USB to SDIO/SD/MMC adapters and embedded on some motherboards.
+
+ The VUB300 chip supports SD and MMC memory cards in addition
+ to single and multifunction SDIO cards.
+
+ Some SDIO cards will need a firmware file to be loaded and
+ sent to VUB300 chip in order to achieve better data throughput.
+ Download these "Offload Pseudocode" from Elan Digital Systems'
+ web-site http://www.elandigitalsystems.com/support/downloads.php
+ and put them in /lib/firmware. Note that without these additional
+ firmware files the VUB300 chip will still function, but not at
+ the best obtainable data rate.
+
+ To compile this mmc host controller driver as a module,
+ choose M here: the module will be called vub300.
+
+ If you have a computer with an embedded VUB300 chip
+ or if you intend connecting a USB adapter based on a
+ VUB300 chip say Y or M here.
+
config MMC_USHC
tristate "USB SD Host Controller (USHC) support"
depends on USB