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authorArindam Nath <arindam.nath@amd.com>2011-05-05 12:19:01 +0530
committerChris Ball <cjb@laptop.org>2011-05-24 23:53:45 -0400
commit49c468fcf878d2c86e31920cf54aa90c88418a66 (patch)
treed8088bf8fb1a011f05ebbdefef49f2a6f4739432 /drivers/mmc/host/sdhci.h
parent758535c4e3cdd2b5b09565d9651aaa541aac3de8 (diff)
mmc: sd: add support for uhs bus speed mode selection
This patch adds support for setting UHS-I bus speed mode during UHS-I initialization procedure. Since both the host and card can support more than one bus speed, we select the highest speed based on both of their capabilities. First we set the bus speed mode for the card using CMD6 mode 1, and then we program the host controller to support the required speed mode. We also set High Speed Enable in case one of the UHS-I modes is selected. We take care to reset SD clock before setting UHS mode in the Host Control2 register, and then re-enable it as per the Host Controller spec v3.00. We then set the clock frequency for the UHS-I mode selected. Tested by Zhangfei Gao with a Toshiba uhs card and general hs card, on mmp2 in SDMA mode. Signed-off-by: Arindam Nath <arindam.nath@amd.com> Reviewed-by: Philip Rakity <prakity@marvell.com> Tested-by: Philip Rakity <prakity@marvell.com> Acked-by: Zhangfei Gao <zhangfei.gao@marvell.com> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/host/sdhci.h')
-rw-r--r--drivers/mmc/host/sdhci.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 667bf8874be..d96f6afcca1 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -149,6 +149,12 @@
#define SDHCI_ACMD12_ERR 0x3C
#define SDHCI_HOST_CONTROL2 0x3E
+#define SDHCI_CTRL_UHS_MASK 0x0007
+#define SDHCI_CTRL_UHS_SDR12 0x0000
+#define SDHCI_CTRL_UHS_SDR25 0x0001
+#define SDHCI_CTRL_UHS_SDR50 0x0002
+#define SDHCI_CTRL_UHS_SDR104 0x0003
+#define SDHCI_CTRL_UHS_DDR50 0x0004
#define SDHCI_CTRL_VDD_180 0x0008
#define SDHCI_CTRL_DRV_TYPE_MASK 0x0030
#define SDHCI_CTRL_DRV_TYPE_B 0x0000