[PATCH 1/2] i2c: ocores: Add support for IO mapper registers.

[Andrew Lunn <andrew@xxxxxxx>]

Some implementations of the OCORES i2c bus master use IO mapped
registers. Add support for getting the IO registers from the platform
data, and register accessor functions.

Signed-off-by: Andrew Lunn <andrew@xxxxxxx>
---
 drivers/i2c/busses/i2c-ocores.c | 32 +++++++++++++++++++++++++++++---
 1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c
index b32d67c90d67..0d90a82a2c03 100644
--- a/drivers/i2c/busses/i2c-ocores.c
+++ b/drivers/i2c/busses/i2c-ocores.c
@@ -34,6 +34,7 @@
  */
 struct ocores_i2c {
 	void __iomem *base;
+	int iobase;
 	u32 reg_shift;
 	u32 reg_io_width;
 	unsigned long flags;
@@ -135,6 +136,16 @@ static inline u8 oc_getreg_32be(struct ocores_i2c *i2c, int reg)
 	return ioread32be(i2c->base + (reg << i2c->reg_shift));
 }
 
+static void oc_setreg_io_8(struct ocores_i2c *i2c, int reg, u8 value)
+{
+	outb(value, i2c->iobase + reg);
+}
+
+static inline u8 oc_getreg_io_8(struct ocores_i2c *i2c, int reg)
+{
+	return inb(i2c->iobase + reg);
+}
+
 static inline void oc_setreg(struct ocores_i2c *i2c, int reg, u8 value)
 {
 	i2c->setreg(i2c, reg, value);
@@ -593,9 +604,24 @@ static int ocores_i2c_probe(struct platform_device *pdev)
 	spin_lock_init(&i2c->process_lock);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	i2c->base = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(i2c->base))
-		return PTR_ERR(i2c->base);
+	if (res) {
+		i2c->base = devm_ioremap_resource(&pdev->dev, res);
+		if (IS_ERR(i2c->base))
+			return PTR_ERR(i2c->base);
+	} else {
+		res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+		if (!res)
+			return -EINVAL;
+		i2c->iobase = res->start;
+		if (!devm_request_region(&pdev->dev, res->start,
+					 resource_size(res),
+					 pdev->name)) {
+			dev_err(&pdev->dev, "Can't get I/O resource.\n");
+			return -EBUSY;
+		}
+		i2c->setreg = oc_setreg_io_8;
+		i2c->getreg = oc_getreg_io_8;
+	}
 
 	pdata = dev_get_platdata(&pdev->dev);
 	if (pdata) {
-- 
2.20.1