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[ARM] pxa: add MFP_PULL_FLOAT 

There is currently an uncovered case for MFP configuration on PXAs which
is selected by setting the PULL_SEL bit but none of the PULL{UP,DOWN}_EN
bits. This case is needed to explicitly let pins float, even if the
selected alternate function would default to a configuration with a pull
resistor enabled.

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
hifive-unleashed-5.1
Daniel Mack 2009-08-11 14:39:09 +02:00 committed by Eric Miao
parent 9304d008d6
commit fb60870f63
2 changed files with 6 additions and 2 deletions
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5
arch/arm/plat-pxa/include/plat/mfp.h
View File

@ -325,8 +325,9 @@ typedef unsigned long mfp_cfg_t;
#define MFP_PULL_LOW (0x1 << 21)
#define MFP_PULL_HIGH (0x2 << 21)
#define MFP_PULL_BOTH (0x3 << 21)
#define MFP_PULL_MASK (0x3 << 21)
#define MFP_PULL(x) (((x) >> 21) & 0x3)
#define MFP_PULL_FLOAT (0x4 << 21)
#define MFP_PULL_MASK (0x7 << 21)
#define MFP_PULL(x) (((x) >> 21) & 0x7)
#define MFP_CFG_DEFAULT (MFP_AF0 | MFP_DS03X | MFP_LPM_DEFAULT |\
MFP_LPM_EDGE_NONE | MFP_PULL_NONE)

3
arch/arm/plat-pxa/mfp.c
View File

@ -77,11 +77,13 @@
* MFPR_PULL_LOW 1 0 1
* MFPR_PULL_HIGH 1 1 0
* MFPR_PULL_BOTH 1 1 1
* MFPR_PULL_FLOAT 1 0 0
*/
#define MFPR_PULL_NONE (0)
#define MFPR_PULL_LOW (MFPR_PULL_SEL | MFPR_PULLDOWN_EN)
#define MFPR_PULL_BOTH (MFPR_PULL_LOW | MFPR_PULLUP_EN)
#define MFPR_PULL_HIGH (MFPR_PULL_SEL | MFPR_PULLUP_EN)
#define MFPR_PULL_FLOAT (MFPR_PULL_SEL)
/* mfp_spin_lock is used to ensure that MFP register configuration
* (most likely a read-modify-write operation) is atomic, and that
@ -116,6 +118,7 @@ static const unsigned long mfpr_pull[] = {
MFPR_PULL_LOW,
MFPR_PULL_HIGH,
MFPR_PULL_BOTH,
MFPR_PULL_FLOAT,
};
/* mapping of MFP_LPM_EDGE_* definitions to MFPR_EDGE_* register bits */