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misc: sram: add optional ioremap without write combining

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Some SRAM users may require non-bufferable access to the memory, which is
impossible, because devm_ioremap_wc() is used for setting sram->virt_base.

This commit adds optional flag 'no-memory-wc', which allow to choose remap
method, using DT property. Documentation is updated accordingly.

Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcin Wojtas 2016-03-14 09:38:56 +01:00 • committed by David S. Miller
parent d3bf9b19ff
commit eb43e02313
2 changed files with 9 additions and 1 deletions
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5
drivers/misc/sram.c
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@ -360,7 +360,10 @@ static int sram_probe(struct platform_device *pdev)
return -EBUSY;
}
sram->virt_base = devm_ioremap_wc(sram->dev, res->start, size);
if (of_property_read_bool(pdev->dev.of_node, "no-memory-wc"))
sram->virt_base = devm_ioremap(sram->dev, res->start, size);
else
sram->virt_base = devm_ioremap_wc(sram->dev, res->start, size);
if (IS_ERR(sram->virt_base))
return PTR_ERR(sram->virt_base);