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authorFlorian Fainelli <f.fainelli@gmail.com>2016-01-06 10:55:22 -0800
committerLinus Walleij <linus.walleij@linaro.org>2016-01-07 16:25:09 +0100
commitce5a7e81390b9ae28f8dc82505afa96c1787d312 (patch)
tree8c18c00d5eb62a37ccc474d4c8eb72ada410ad54 /drivers/gpio
parent780c43dd61a09ce7d9cdb1e7c33d3341ec471ff0 (diff)
gpio: brcmstb: Set endian flags for big-endian MIPS
Broadcom MIPS-based STB chips endianness is configured by boot strap, which also reverses all bus endianness (i.e., big-endian CPU + big endian bus ==> native endian I/O). Other architectures (e.g., ARM) either do not support big endian, or else leave I/O in little endian mode. Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Acked-by: Gregory Fong <gregory.0xf0@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpio-brcmstb.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-brcmstb.c b/drivers/gpio/gpio-brcmstb.c
index dc3f0395693b..d7644251e869 100644
--- a/drivers/gpio/gpio-brcmstb.c
+++ b/drivers/gpio/gpio-brcmstb.c
@@ -409,6 +409,7 @@ static int brcmstb_gpio_probe(struct platform_device *pdev)
int num_banks = 0;
int err;
static int gpio_base;
+ unsigned long flags = 0;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -438,6 +439,18 @@ static int brcmstb_gpio_probe(struct platform_device *pdev)
if (brcmstb_gpio_sanity_check_banks(dev, np, res))
return -EINVAL;
+ /*
+ * MIPS endianness is configured by boot strap, which also reverses all
+ * bus endianness (i.e., big-endian CPU + big endian bus ==> native
+ * endian I/O).
+ *
+ * Other architectures (e.g., ARM) either do not support big endian, or
+ * else leave I/O in little endian mode.
+ */
+#if defined(CONFIG_MIPS) && defined(__BIG_ENDIAN)
+ flags = BGPIOF_BIG_ENDIAN_BYTE_ORDER;
+#endif
+
of_property_for_each_u32(np, "brcm,gpio-bank-widths", prop, p,
bank_width) {
struct brcmstb_gpio_bank *bank;
@@ -466,7 +479,7 @@ static int brcmstb_gpio_probe(struct platform_device *pdev)
err = bgpio_init(gc, dev, 4,
reg_base + GIO_DATA(bank->id),
NULL, NULL, NULL,
- reg_base + GIO_IODIR(bank->id), 0);
+ reg_base + GIO_IODIR(bank->id), flags);
if (err) {
dev_err(dev, "bgpio_init() failed\n");
goto fail;