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authorMarcin Wojtas <mw@semihalf.com>2016-03-14 11:38:56 +0300
committerDavid S. Miller <davem@davemloft.net>2016-03-14 19:19:45 +0300
commiteb43e023130b5021c1ffad4d5c84cb310ffcb0f6 (patch)
treeb56f01e32ba60c6ddeeb983d2e114c351bc602af /drivers/misc/sram.c
parentd3bf9b19ff06bdcc4aacdd6eb395c742138a9dc9 (diff)
downloadlinux-eb43e023130b5021c1ffad4d5c84cb310ffcb0f6.tar.xz
misc: sram: add optional ioremap without write combining
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>
Diffstat (limited to 'drivers/misc/sram.c')
-rw-r--r--drivers/misc/sram.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index 736dae715dbf..69cdabea9c03 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -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);