i2c: xiic: Fix big-endian register access

The driver tried to access device registers with the (little-endian)
iowrite/ioread functions. While this worked on little-endian machines
(e.g. Microblaze with AXI bus), it made the driver unusable on
big-endian machines (e.g. PPC405 with PLB).

During the probe function, the driver tried to write a 32-bit reset mask
into the reset register. This caused an error interrupt on big-endian
systems, because the device detected an invalid (byte-swapped) reset
mask. The result was an Oops.

The patch implements an endianness detection similar to the one used in
other Xilinx drivers like drivers/spi/spi-xilinx.c. It was tested on a
PPC405/PLB system.

Signed-off-by: Thomas Gessler <Thomas.Gessler@exp2.physik.uni-giessen.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c
index cc65ea0..522916a 100644 (file)
--- a/drivers/i2c/busses/i2c-xiic.c
+++ b/drivers/i2c/busses/i2c-xiic.c
@@ -46,6 +46,11 @@ enum xilinx_i2c_state {
        STATE_START
 };
 
+enum xiic_endian {
+       LITTLE,
+       BIG
+};
+
 /**
  * struct xiic_i2c - Internal representation of the XIIC I2C bus
  * @base:      Memory base of the HW registers
@@ -70,6 +75,7 @@ struct xiic_i2c {
        enum xilinx_i2c_state   state;
        struct i2c_msg          *rx_msg;
        int                     rx_pos;
+       enum xiic_endian        endianness;
 };
 
 
@@ -170,29 +176,58 @@ struct xiic_i2c {
 static void xiic_start_xfer(struct xiic_i2c *i2c);
 static void __xiic_start_xfer(struct xiic_i2c *i2c);
 
+/*
+ * For the register read and write functions, a little-endian and big-endian
+ * version are necessary. Endianness is detected during the probe function.
+ * Only the least significant byte [doublet] of the register are ever
+ * accessed. This requires an offset of 3 [2] from the base address for
+ * big-endian systems.
+ */
+
 static inline void xiic_setreg8(struct xiic_i2c *i2c, int reg, u8 value)
 {
-       iowrite8(value, i2c->base + reg);
+       if (i2c->endianness == LITTLE)
+               iowrite8(value, i2c->base + reg);
+       else
+               iowrite8(value, i2c->base + reg + 3);
 }
 
 static inline u8 xiic_getreg8(struct xiic_i2c *i2c, int reg)
 {
-       return ioread8(i2c->base + reg);
+       u8 ret;
+
+       if (i2c->endianness == LITTLE)
+               ret = ioread8(i2c->base + reg);
+       else
+               ret = ioread8(i2c->base + reg + 3);
+       return ret;
 }
 
 static inline void xiic_setreg16(struct xiic_i2c *i2c, int reg, u16 value)
 {
-       iowrite16(value, i2c->base + reg);
+       if (i2c->endianness == LITTLE)
+               iowrite16(value, i2c->base + reg);
+       else
+               iowrite16be(value, i2c->base + reg + 2);
 }
 
 static inline void xiic_setreg32(struct xiic_i2c *i2c, int reg, int value)
 {
-       iowrite32(value, i2c->base + reg);
+       if (i2c->endianness == LITTLE)
+               iowrite32(value, i2c->base + reg);
+       else
+               iowrite32be(value, i2c->base + reg);
 }
 
 static inline int xiic_getreg32(struct xiic_i2c *i2c, int reg)
 {
-       return ioread32(i2c->base + reg);
+       u32 ret;
+
+       if (i2c->endianness == LITTLE)
+               ret = ioread32(i2c->base + reg);
+       else
+               ret = ioread32be(i2c->base + reg);
+       return ret;
 }
 
 static inline void xiic_irq_dis(struct xiic_i2c *i2c, u32 mask)
@@ -692,6 +727,7 @@ static int xiic_i2c_probe(struct platform_device *pdev)
        struct resource *res;
        int ret, irq;
        u8 i;
+       u32 sr;
 
        i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
        if (!i2c)
@@ -724,6 +760,18 @@ static int xiic_i2c_probe(struct platform_device *pdev)
                return ret;
        }
 
+       /*
+        * Detect endianness
+        * Try to reset the TX FIFO. Then check the EMPTY flag. If it is not
+        * set, assume that the endianness was wrong and swap.
+        */
+       i2c->endianness = LITTLE;
+       xiic_setreg32(i2c, XIIC_CR_REG_OFFSET, XIIC_CR_TX_FIFO_RESET_MASK);
+       /* Reset is cleared in xiic_reinit */
+       sr = xiic_getreg32(i2c, XIIC_SR_REG_OFFSET);
+       if (!(sr & XIIC_SR_TX_FIFO_EMPTY_MASK))
+               i2c->endianness = BIG;
+
        xiic_reinit(i2c);
 
        /* add i2c adapter to i2c tree */