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git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
Blackfin: SIC: cut down on IAR MMR reads a bit
Tweak the for loops that operate on the SIC IAR system MMRs to avoid
re-reading them multiple times in a row. System MMRs are a little
slower to access, so avoid the penalty when possible.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
+18
-15
arch/blackfin/mach-common/ints-priority.c
+18
-15
arch/blackfin/mach-common/ints-priority.c
···
92
{
93
unsigned ivg, irq_pos = 0;
94
for (ivg = 0; ivg <= IVG13 - IVG7; ivg++) {
95
-
int irqn;
96
97
ivg7_13[ivg].istop = ivg7_13[ivg].ifirst = &ivg_table[irq_pos];
98
99
-
for (irqn = 0; irqn < NR_PERI_INTS; irqn++) {
100
-
int iar_shift = (irqn & 7) * 4;
101
-
if (ivg == (0xf &
102
-
#if defined(CONFIG_BF52x) || defined(CONFIG_BF538) \
103
-
|| defined(CONFIG_BF539) || defined(CONFIG_BF51x)
104
-
bfin_read32((unsigned long *)SIC_IAR0 +
105
-
((irqn % 32) >> 3) + ((irqn / 32) *
106
-
((SIC_IAR4 - SIC_IAR0) / 4))) >> iar_shift)) {
107
#else
108
-
bfin_read32((unsigned long *)SIC_IAR0 +
109
-
(irqn >> 3)) >> iar_shift)) {
110
#endif
111
-
ivg_table[irq_pos].irqno = IVG7 + irqn;
112
-
ivg_table[irq_pos].isrflag = 1 << (irqn % 32);
113
-
ivg7_13[ivg].istop++;
114
-
irq_pos++;
115
}
116
}
117
}
···
92
{
93
unsigned ivg, irq_pos = 0;
94
for (ivg = 0; ivg <= IVG13 - IVG7; ivg++) {
95
+
int irqN;
96
97
ivg7_13[ivg].istop = ivg7_13[ivg].ifirst = &ivg_table[irq_pos];
98
99
+
for (irqN = 0; irqN < NR_PERI_INTS; irqN += 4) {
100
+
int irqn;
101
+
u32 iar = bfin_read32((unsigned long *)SIC_IAR0 +
102
+
#if defined(CONFIG_BF51x) || defined(CONFIG_BF52x) || \
103
+
defined(CONFIG_BF538) || defined(CONFIG_BF539)
104
+
((irqN % 32) >> 3) + ((irqN / 32) * ((SIC_IAR4 - SIC_IAR0) / 4))
105
#else
106
+
(irqN >> 3)
107
#endif
108
+
);
109
+
110
+
for (irqn = irqN; irqn < irqN + 4; ++irqn) {
111
+
int iar_shift = (irqn & 7) * 4;
112
+
if (ivg == (0xf & (iar >> iar_shift))) {
113
+
ivg_table[irq_pos].irqno = IVG7 + irqn;
114
+
ivg_table[irq_pos].isrflag = 1 << (irqn % 32);
115
+
ivg7_13[ivg].istop++;
116
+
irq_pos++;
117
+
}
118
}
119
}
120
}