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authorSonic Zhang <sonic.zhang@analog.com>2013-07-01 07:24:46 +0400
committerSteven Miao <realmz6@gmail.com>2013-11-15 13:33:41 +0400
commitf70de486b2dd21b60705e57afecdc5f6a79be4e7 (patch)
tree636ec819180492fc6d6f2947e111fda26a35efde /arch/blackfin
parent5e01dc7b26d9f24f39abace5da98ccbd6a5ceb52 (diff)
downloadlinux-f70de486b2dd21b60705e57afecdc5f6a79be4e7.tar.xz
Blackfin: bfin_gpio: Use proper mask for comparing pfunc
For BF537_FAMILY, when offset != 1, the mask is 1. Thus add proper mask for comparing pfunc with function. Also has small refactor for better readability. In portmux_setup(), it looks odd having "pmux &= ~(3 << 1);" while in current code we do pmux |= (function << offset);. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Diffstat (limited to 'arch/blackfin')
-rw-r--r--arch/blackfin/kernel/bfin_gpio.c23
1 files changed, 14 insertions, 9 deletions
diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c
index ed978f1c5cb9..780d27db1257 100644
--- a/arch/blackfin/kernel/bfin_gpio.c
+++ b/arch/blackfin/kernel/bfin_gpio.c
@@ -255,7 +255,7 @@ static int portmux_group_check(unsigned short per)
u16 ident = P_IDENT(per);
u16 function = P_FUNCT2MUX(per);
s8 offset = port_mux[ident];
- u16 m, pmux, pfunc;
+ u16 m, pmux, pfunc, mask;
if (offset < 0)
return 0;
@@ -270,10 +270,12 @@ static int portmux_group_check(unsigned short per)
continue;
if (offset == 1)
- pfunc = (pmux >> offset) & 3;
+ mask = 3;
else
- pfunc = (pmux >> offset) & 1;
- if (pfunc != function) {
+ mask = 1;
+
+ pfunc = (pmux >> offset) & mask;
+ if (pfunc != (function & mask)) {
pr_err("pin group conflict! request pin %d func %d conflict with pin %d func %d\n",
ident, function, m, pfunc);
return -EINVAL;
@@ -288,17 +290,20 @@ static void portmux_setup(unsigned short per)
u16 ident = P_IDENT(per);
u16 function = P_FUNCT2MUX(per);
s8 offset = port_mux[ident];
- u16 pmux;
+ u16 pmux, mask;
if (offset == -1)
return;
pmux = bfin_read_PORT_MUX();
- if (offset != 1)
- pmux &= ~(1 << offset);
+ if (offset == 1)
+ mask = 3;
else
- pmux &= ~(3 << 1);
- pmux |= (function << offset);
+ mask = 1;
+
+ pmux &= ~(mask << offset);
+ pmux |= ((function & mask) << offset);
+
bfin_write_PORT_MUX(pmux);
}
#elif defined(CONFIG_BF54x) || defined(CONFIG_BF60x)