diff options
| author | Arindam Nath <arindam.nath@amd.com> | 2011-05-05 12:19:06 +0530 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-05-24 23:53:48 -0400 |
| commit | c3ed3877625f10d600b0eca2ca48a68c46aed660 (patch) | |
| tree | d8170541551dca7abcefa118c4681d7294e3456d /drivers/mmc/host/sdhci.h | |
| parent | 4d55c5a13a189a80d40383f02c8026f9a87d7c87 (diff) | |
| download | linux-c3ed3877625f10d600b0eca2ca48a68c46aed660.tar.gz | |
mmc: sdhci: add support for programmable clock mode
Host Controller v3.00 supports programmable clock mode as an optional feature. The support for this mode is indicated by non-zero value in bits 48-55 of the Capabilities register. If supported, the actual value of Clock Multiplier is one more than the value provided in the bit fields. We only set Clock Generator Select (bit 5) and SDCLK Frequency Select (bits 8-15) of the Clock Control register in case Preset Value Enable is not set, otherwise these fields are automatically set by the Host Controller based on the UHS mode selected. Also, since the maximum and minimum clock frequency in this mode can be (Base Clock * Clock Mul) and (Base Clock * Clock Mul)/1024 respectively, f_max and f_min have been recalculated to reflect this change. 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.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index e62367491eee..6b0a0ee9ac6e 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -101,6 +101,7 @@ #define SDHCI_DIV_MASK 0xFF #define SDHCI_DIV_MASK_LEN 8 #define SDHCI_DIV_HI_MASK 0x300 +#define SDHCI_PROG_CLOCK_MODE 0x0020 #define SDHCI_CLOCK_CARD_EN 0x0004 #define SDHCI_CLOCK_INT_STABLE 0x0002 #define SDHCI_CLOCK_INT_EN 0x0001 @@ -191,6 +192,8 @@ #define SDHCI_DRIVER_TYPE_C 0x00000020 #define SDHCI_DRIVER_TYPE_D 0x00000040 #define SDHCI_USE_SDR50_TUNING 0x00002000 +#define SDHCI_CLOCK_MUL_MASK 0x00FF0000 +#define SDHCI_CLOCK_MUL_SHIFT 16 #define SDHCI_CAPABILITIES_1 0x44 |