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[NET] smc91x: prepare for SMC_IO_SHIFT to be a platform configurable variable

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Now one can use the following code

  #define SMC_IO_SHIFT	lp->io_shift

to make SMC_IO_SHIFT a variable. This, however, will slightly increase
the CPU overhead and have negative impact on the network performance.
The tradeoff is, this can be specified in the smc91x platform data so
that multiple boards support can be built in a single zImage.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Acked-by: Nicolas Pitre <nico@cam.org>
Acked-by: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Eric Miao
2008-06-24 13:38:50 +08:00
committed by Russell King
parent c4f0e76747
commit 159198862a
3 changed files with 41 additions and 26 deletions
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include/linux/smc91x.h
+7
View File
@@ -7,6 +7,13 @@
#define SMC91X_NOWAIT (1 << 3)
/* two bits for IO_SHIFT, let's hope later designs will keep this sane */
#define SMC91X_IO_SHIFT_0 (0 << 4)
#define SMC91X_IO_SHIFT_1 (1 << 4)
#define SMC91X_IO_SHIFT_2 (2 << 4)
#define SMC91X_IO_SHIFT_3 (3 << 4)
#define SMC91X_IO_SHIFT(x) (((x) >> 4) & 0x3)
struct smc91x_platdata {
unsigned long flags;
};