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net: smc1111: add a quirk for pxa pxa27x platforms 

As hinted in the linux kernel driver, pxa platforms such as mainstone,
stargate and idp have a broken design, where half-word writes not
aligned to a word address are not working.

This patch is a taking back the half-word write accessor for this
specific case from the linux kernel.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Robert Jarzmik 2015-04-11 23:42:42 +02:00 committed by Sascha Hauer
parent 6393f1345a
commit 1e72d3c622
2 changed files with 30 additions and 0 deletions
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29
drivers/net/smc91111.c
View File

@ -560,6 +560,20 @@ static inline void a32_insl(void __iomem *base, unsigned int offset, void *data,
readsl(base + (offset << shift), data, count);
}
static void a16_outw_algn4(unsigned value, void __iomem *base,
unsigned int offset, unsigned shift)
{
u32 v;
if ((offset << shift) & 2) {
v = value << 16;
v |= (a32_inl(base, offset & ~2, shift) & 0xffff);
a32_outl(v, base, offset & ~2, shift);
} else {
writew(value, base + (offset << shift));
}
}
static const struct accessors access_via_16bit = {
.ob = a8_outb,
.ow = a16_outw,
@ -583,6 +597,18 @@ static const struct accessors access_via_32bit = {
.isl = a32_insl,
};
/* access happens via a 32 bit bus, writes must by word aligned */
static const struct accessors access_via_32bit_aligned_short_writes = {
.ob = a8_outb,
.ow = a16_outw_algn4,
.ol = a32_outl,
.osl = a32_outsl,
.ib = a8_inb,
.iw = a16_inw,
.il = a32_inl,
.isl = a32_insl,
};
/* ------------------------------------------------------------------------ */
static unsigned last_bank;
@ -1435,6 +1461,9 @@ static int smc91c111_probe(struct device_d *dev)
priv->shift = pdata->addr_shift;
if (pdata->bus_width == 16)
priv->a = access_via_16bit;
if (((pdata->bus_width == 0) || (pdata->bus_width == 32)) &&
(pdata->word_aligned_short_writes))
priv->a = access_via_32bit_aligned_short_writes;
priv->config_setup = pdata->config_setup;
priv->control_setup = pdata->control_setup;
}

1
include/net/smc91111.h
View File

@ -11,6 +11,7 @@ struct smc91c111_pdata {
int qemu_fixup;
int addr_shift;
int bus_width;
bool word_aligned_short_writes;
int config_setup;
int control_setup;
};