diff options
| author | Axel Lin <axel.lin@ingics.com> | 2013-06-28 14:45:06 +0800 |
|---|---|---|
| committer | Sonic Zhang <sonic.zhang@analog.com> | 2013-07-31 16:56:03 +0800 |
| commit | 9868b1426315fc5ac4883b5267d5337b2dfcbd95 (patch) | |
| tree | efbdc234058f9534633c840c00db8129f77b02d4 /arch/blackfin/cpu/gpio.c | |
| parent | 2ced773a1ac20de2bf3d642944eb8de028420573 (diff) | |
| download | u-boot-imx-9868b1426315fc5ac4883b5267d5337b2dfcbd95.zip u-boot-imx-9868b1426315fc5ac4883b5267d5337b2dfcbd95.tar.gz u-boot-imx-9868b1426315fc5ac4883b5267d5337b2dfcbd95.tar.bz2 | |
blackfin: gpio: Use proper mask for comparing function
The function return from P_FUNCT2MUX(per) takes 2 bits, however
for BF537_FAMILY with offset != 1 the function is 1 bit.
Also has small refactor for better readability.
In portmux_setup(), it looks odd having "muxreg &= ~(3 << 1);"
while in current code we do muxreg |= (function << offset);.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Diffstat (limited to 'arch/blackfin/cpu/gpio.c')
| -rw-r--r-- | arch/blackfin/cpu/gpio.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/arch/blackfin/cpu/gpio.c b/arch/blackfin/cpu/gpio.c index a4d10d5..f9aff4d 100644 --- a/arch/blackfin/cpu/gpio.c +++ b/arch/blackfin/cpu/gpio.c @@ -247,7 +247,7 @@ static struct { static void portmux_setup(unsigned short per) { - u16 y, offset, muxreg; + u16 y, offset, muxreg, mask; u16 function = P_FUNCT2MUX(per); for (y = 0; y < ARRAY_SIZE(port_mux_lut); y++) { @@ -258,12 +258,13 @@ static void portmux_setup(unsigned short per) offset = port_mux_lut[y].offset; muxreg = bfin_read_PORT_MUX(); - if (offset != 1) - muxreg &= ~(1 << offset); + if (offset == 1) + mask = 3; else - muxreg &= ~(3 << 1); + mask = 1; - muxreg |= (function << offset); + muxreg &= ~(mask << offset); + muxreg |= ((function & mask) << offset); bfin_write_PORT_MUX(muxreg); } } |