[PATCH 8/9] bus: brcmstb_gisb: Honor the "big-endian" and "native-endian" DT properties

[Kevin Cernekee]

On chips strapped for BE, we'll need to use ioread32be/iowrite32be instead of
ioread32/iowrite32.

Signed-off-by: Kevin Cernekee <cerne...@gmail.com>
---
 drivers/bus/brcmstb_gisb.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/bus/brcmstb_gisb.c b/drivers/bus/brcmstb_gisb.c
index 172908d..969b992 100644
--- a/drivers/bus/brcmstb_gisb.c
+++ b/drivers/bus/brcmstb_gisb.c
@@ -90,6 +90,7 @@ static const int gisb_offsets_bcm7445[] = {
 struct brcmstb_gisb_arb_device {
        void __iomem    *base;
        const int       *gisb_offsets;
+       bool            big_endian;
        struct mutex    lock;
        struct list_head next;
        u32 valid_mask;
@@ -106,7 +107,10 @@ static u32 gisb_read(struct brcmstb_gisb_arb_device *gdev, 
int reg)
        if (offset == -1)
                return 1;
 
-       return ioread32(gdev->base + offset);
+       if (gdev->big_endian)
+               return ioread32be(gdev->base + offset);
+       else
+               return ioread32(gdev->base + offset);
 }
 
 static void gisb_write(struct brcmstb_gisb_arb_device *gdev, u32 val, int reg)
@@ -115,7 +119,11 @@ static void gisb_write(struct brcmstb_gisb_arb_device 
*gdev, u32 val, int reg)
 
        if (offset == -1)
                return;
-       iowrite32(val, gdev->base + reg);
+
+       if (gdev->big_endian)
+               iowrite32be(val, gdev->base + reg);
+       else
+               iowrite32(val, gdev->base + reg);
 }
 
 static ssize_t gisb_arb_get_timeout(struct device *dev,
@@ -300,6 +308,7 @@ static int brcmstb_gisb_arb_probe(struct platform_device 
*pdev)
                return -EINVAL;
        }
        gdev->gisb_offsets = of_id->data;
+       gdev->big_endian = of_device_is_big_endian(dn);
 
        err = devm_request_irq(&pdev->dev, timeout_irq,
                                brcmstb_gisb_timeout_handler, 0, pdev->name,
-- 
2.1.0

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