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| author | Sonic Zhang <sonic.zhang@analog.com> | 2013-07-01 11:24:46 +0800 |
|---|---|---|
| committer | Steven Miao <realmz6@gmail.com> | 2013-11-15 17:33:41 +0800 |
| commit | f70de486b2dd21b60705e57afecdc5f6a79be4e7 (patch) | |
| tree | 636ec819180492fc6d6f2947e111fda26a35efde /arch | |
| parent | 5e01dc7b26d9f24f39abace5da98ccbd6a5ceb52 (diff) | |
| download | linux-f70de486b2dd21b60705e57afecdc5f6a79be4e7.tar.bz2 | |
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')
| -rw-r--r-- | arch/blackfin/kernel/bfin_gpio.c | 23 |
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) |