mmc: sdhci: Add 64-bit ADMA support

Add 64-bit ADMA support including:
	- add 64-bit ADMA descriptor
	- add SDHCI_USE_64_BIT_DMA flag
	- set upper 32-bits of DMA addresses
	- ability to select 64-bit ADMA
	- ability to use 64-bit ADMA sizes and alignment
	- display "ADMA 64-bit" when host is added

It is assumed that a 64-bit capable device has set a 64-bit DMA mask
and *must* do 64-bit DMA.  A driver has the opportunity to change
that during the first call to ->enable_dma().  Similarly
SDHCI_QUIRK2_BROKEN_64_BIT_DMA must be left to the drivers to
implement.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 2a72e9510833..931ac5e05453 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -100,6 +100,8 @@ struct sdhci_host {
 #define SDHCI_QUIRK2_BROKEN_DDR50                       (1<<7)
 /* Stop command (CMD12) can set Transfer Complete when not using MMC_RSP_BUSY */
 #define SDHCI_QUIRK2_STOP_WITH_TC                       (1<<8)
+/* Controller does not support 64-bit DMA */
+#define SDHCI_QUIRK2_BROKEN_64_BIT_DMA                  (1<<9)
 
         int irq;                /* Device IRQ */
         void __iomem *ioaddr;   /* Mapped address */
@@ -130,6 +132,7 @@ struct sdhci_host {
 #define SDHCI_SDIO_IRQ_ENABLED  (1<<9)  /* SDIO irq enabled */
 #define SDHCI_SDR104_NEEDS_TUNING (1<<10)       /* SDR104/HS200 needs tuning */
 #define SDHCI_USING_RETUNING_TIMER (1<<11)      /* Host is using a retuning timer for the card */
+#define SDHCI_USE_64_BIT_DMA    (1<<12) /* Use 64-bit DMA */
 
         unsigned int version;   /* SDHCI spec. version */