i2c-pxa2xx: use dynamic register layout

This will prepare the driver to handle register layouts where certain
registers are not available at all.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 50 insertions, 20 deletions

diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index f4c19a97e0b3..a011455650e9 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -38,29 +38,49 @@
 #include <asm/irq.h>
 #include <plat/i2c.h>
 
+struct pxa_reg_layout {
+        u32 ibmr;
+        u32 idbr;
+        u32 icr;
+        u32 isr;
+        u32 isar;
+};
+
+enum pxa_i2c_types {
+        REGS_PXA2XX,
+        REGS_PXA3XX,
+};
+
 /*
- * I2C register offsets will be shifted 0 or 1 bit left, depending on
- * different SoCs
+ * I2C registers definitions
  */
-#define REG_SHIFT_0     (0 << 0)
-#define REG_SHIFT_1     (1 << 0)
-#define REG_SHIFT(d)    ((d) & 0x1)
+static struct pxa_reg_layout pxa_reg_layout[] = {
+        [REGS_PXA2XX] = {
+                .ibmr = 0x00,
+                .idbr = 0x10,
+                .icr =  0x20,
+                .isr =  0x30,
+                .isar = 0x40,
+        },
+        [REGS_PXA3XX] = {
+                .ibmr = 0x00,
+                .idbr = 0x08,
+                .icr =  0x10,
+                .isr =  0x18,
+                .isar = 0x20,
+        },
+};
 
 static const struct platform_device_id i2c_pxa_id_table[] = {
-        { "pxa2xx-i2c",         REG_SHIFT_1 },
-        { "pxa3xx-pwri2c",      REG_SHIFT_0 },
+        { "pxa2xx-i2c",         REGS_PXA2XX },
+        { "pxa3xx-pwri2c",      REGS_PXA3XX },
         { },
 };
 MODULE_DEVICE_TABLE(platform, i2c_pxa_id_table);
 
 /*
- * I2C registers and bit definitions
+ * I2C bit definitions
  */
-#define IBMR            (0x00)
-#define IDBR            (0x08)
-#define ICR             (0x10)
-#define ISR             (0x18)
-#define ISAR            (0x20)
 
 #define ICR_START       (1 << 0)           /* start bit */
 #define ICR_STOP        (1 << 1)           /* stop bit */
@@ -111,7 +131,11 @@ struct pxa_i2c {
         u32                     icrlog[32];
 
         void __iomem            *reg_base;
-        unsigned int            reg_shift;
+        void __iomem            *reg_ibmr;
+        void __iomem            *reg_idbr;
+        void __iomem            *reg_icr;
+        void __iomem            *reg_isr;
+        void __iomem            *reg_isar;
 
         unsigned long           iobase;
         unsigned long           iosize;
@@ -121,11 +145,11 @@ struct pxa_i2c {
         unsigned int            fast_mode :1;
 };
 
-#define _IBMR(i2c)      ((i2c)->reg_base + (0x0 << (i2c)->reg_shift))
-#define _IDBR(i2c)      ((i2c)->reg_base + (0x4 << (i2c)->reg_shift))
-#define _ICR(i2c)       ((i2c)->reg_base + (0x8 << (i2c)->reg_shift))
-#define _ISR(i2c)       ((i2c)->reg_base + (0xc << (i2c)->reg_shift))
-#define _ISAR(i2c)      ((i2c)->reg_base + (0x10 << (i2c)->reg_shift))
+#define _IBMR(i2c)      ((i2c)->reg_ibmr)
+#define _IDBR(i2c)      ((i2c)->reg_idbr)
+#define _ICR(i2c)       ((i2c)->reg_icr)
+#define _ISR(i2c)       ((i2c)->reg_isr)
+#define _ISAR(i2c)      ((i2c)->reg_isar)
 
 /*
  * I2C Slave mode address
@@ -1001,6 +1025,7 @@ static int i2c_pxa_probe(struct platform_device *dev)
         struct resource *res;
         struct i2c_pxa_platform_data *plat = dev->dev.platform_data;
         const struct platform_device_id *id = platform_get_device_id(dev);
+        enum pxa_i2c_types i2c_type = id->driver_data;
         int ret;
         int irq;
 
@@ -1044,7 +1069,12 @@ static int i2c_pxa_probe(struct platform_device *dev)
                 ret = -EIO;
                 goto eremap;
         }
-        i2c->reg_shift = REG_SHIFT(id->driver_data);
+
+        i2c->reg_ibmr = i2c->reg_base + pxa_reg_layout[i2c_type].ibmr;
+        i2c->reg_idbr = i2c->reg_base + pxa_reg_layout[i2c_type].idbr;
+        i2c->reg_icr = i2c->reg_base + pxa_reg_layout[i2c_type].icr;
+        i2c->reg_isr = i2c->reg_base + pxa_reg_layout[i2c_type].isr;
+        i2c->reg_isar = i2c->reg_base + pxa_reg_layout[i2c_type].isar;
 
         i2c->iobase = res->start;
         i2c->iosize = resource_size(res);