diff options
| author | Eric Nelson | 2015-12-04 12:32:48 -0700 |
|---|---|---|
| committer | Stefano Babic | 2016-01-03 15:21:21 +0100 |
| commit | f0b5f23f32adfb790293c4f1722042026fa98416 (patch) | |
| tree | af067eff7e525a63c19c32459d496068218c0d36 /include | |
| parent | 839479dda6b449d911d1d56c599f2a9538bb2215 (diff) | |
ARM: imx: fsl_esdhc: fix usage of low 4 bits of sysctl register
The low four bits of the SYSCTL register are reserved on the USDHC
controller on i.MX6 and i.MX7 processors, but are used for clocking
operations on earlier models.
Guard against their usage by hiding the bit mask macros on those
processors.
These bits are used to prevent glitches when changing clocks on
i.MX35 et al. Use the RSTA bit instead for i.MX6 and i.MX7.
>From the i.MX6DQ RM:
To prevent possible glitch on the card clock, clear the
FRC_SDCLK_ON bit when changing clock divisor value(SDCLKFS
or DVS in System Control Register) or setting RSTA bit.
Signed-off-by: Eric Nelson <eric@nelint.com>
Reviewed-by: Fabio Estevam <fabio.estevam@freescale.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>
Reviewed-by: Hector Palacios <hector.palacios@digi.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/fsl_esdhc.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/fsl_esdhc.h b/include/fsl_esdhc.h index aa1b4cf1e4b..073048fb4be 100644 --- a/include/fsl_esdhc.h +++ b/include/fsl_esdhc.h @@ -25,10 +25,12 @@ #define SYSCTL_INITA 0x08000000 #define SYSCTL_TIMEOUT_MASK 0x000f0000 #define SYSCTL_CLOCK_MASK 0x0000fff0 +#if !defined(CONFIG_FSL_USDHC) #define SYSCTL_CKEN 0x00000008 #define SYSCTL_PEREN 0x00000004 #define SYSCTL_HCKEN 0x00000002 #define SYSCTL_IPGEN 0x00000001 +#endif #define SYSCTL_RSTA 0x01000000 #define SYSCTL_RSTC 0x02000000 #define SYSCTL_RSTD 0x04000000 |