mmc: cqhci: support for command queue enabled host

This patch adds CMDQ support for command-queue compatible
hosts.

Command queue is added in eMMC-5.1 specification. This
enables the controller to process upto 32 requests at
a time.

Adrian Hunter contributed renaming to cqhci, recovery, suspend
and resume, cqhci_off, cqhci_wait_for_idle, and external timeout
handling.

Signed-off-by: Asutosh Das <[email protected]>
Signed-off-by: Sujit Reddy Thumma <[email protected]>
Signed-off-by: Konstantin Dorfman <[email protected]>
Signed-off-by: Venkat Gopalakrishnan <[email protected]>
Signed-off-by: Subhash Jadavani <[email protected]>
Signed-off-by: Ritesh Harjani <[email protected]>
Signed-off-by: Adrian Hunter <[email protected]>
Acked-by: Linus Walleij <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>
Tested-by: Linus Walleij <[email protected]>

Author: Venkat Gopalakrishnan

drivers/mmc/host/Kconfig

@@ -857,6 +857,19 @@ config MMC_SUNXI
 	  This selects support for the SD/MMC Host Controller on
 	  Allwinner sunxi SoCs.
 
+config MMC_CQHCI
+	tristate "Command Queue Host Controller Interface support"
+	depends on HAS_DMA
+	help
+	  This selects the Command Queue Host Controller Interface (CQHCI)
+	  support present in host controllers of Qualcomm Technologies, Inc
+	  amongst others.
+	  This controller supports eMMC devices with command queue support.
+
+	  If you have a controller with this interface, say Y or M here.
+
+	  If unsure, say N.
+
 config MMC_TOSHIBA_PCI
 	tristate "Toshiba Type A SD/MMC Card Interface Driver"
 	depends on PCI

drivers/mmc/host/Makefile

@@ -92,6 +92,7 @@ obj-$(CONFIG_MMC_SDHCI_ST)		+= sdhci-st.o
 obj-$(CONFIG_MMC_SDHCI_MICROCHIP_PIC32)	+= sdhci-pic32.o
 obj-$(CONFIG_MMC_SDHCI_BRCMSTB)		+= sdhci-brcmstb.o
 obj-$(CONFIG_MMC_SDHCI_OMAP)		+= sdhci-omap.o
+obj-$(CONFIG_MMC_CQHCI)			+= cqhci.o
 
 ifeq ($(CONFIG_CB710_DEBUG),y)
 	CFLAGS-cb710-mmc	+= -DDEBUG