mfd: let asic3 use mem resource instead of bus_shift

The bus_shift parameter in platform_data is not needed
as we can tell the driver with the IOMEM_RESOURCE whether
the ASIC is located on a 16bit or 32bit memory bus.

The htc-egpio driver uses a more descriptive bus_width parameter,
but for drivers where the register map size fixed, we don't even
need this.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

2 files changed, 7 insertions, 9 deletions

diff --git a/drivers/mfd/asic3.c b/drivers/mfd/asic3.c
index f2fb233b0ff3..3b870e7fb3e1 100644
--- a/drivers/mfd/asic3.c
+++ b/drivers/mfd/asic3.c
@@ -313,6 +313,7 @@ static int __init asic3_irq_probe(struct platform_device *pdev)
         struct asic3 *asic = platform_get_drvdata(pdev);
         unsigned long clksel = 0;
         unsigned int irq, irq_base;
+        int map_size;
 
         asic->irq_nr = platform_get_irq(pdev, 0);
         if (asic->irq_nr < 0)
@@ -551,8 +552,8 @@ static int __init asic3_probe(struct platform_device *pdev)
                 goto out_free;
         }
 
-
-        asic->mapping = ioremap(mem->start, PAGE_SIZE);
+        map_size = mem->end - mem->start + 1;
+        asic->mapping = ioremap(mem->start, map_size);
         if (!asic->mapping) {
                 ret = -ENOMEM;
                 dev_err(asic->dev, "Couldn't ioremap\n");
@@ -561,10 +562,8 @@ static int __init asic3_probe(struct platform_device *pdev)
 
         asic->irq_base = pdata->irq_base;
 
-        if (pdata && pdata->bus_shift)
-                asic->bus_shift = 2 - pdata->bus_shift;
-        else
-                asic->bus_shift = 0;
+        /* calculate bus shift from mem resource */
+        asic->bus_shift = 2 - (map_size >> 12);
 
         clksel = 0;
         asic3_write_register(asic, ASIC3_OFFSET(CLOCK, SEL), clksel);
diff --git a/include/linux/mfd/asic3.h b/include/linux/mfd/asic3.h
index 8f8c46c41f44..322cd6deb9f0 100644
--- a/include/linux/mfd/asic3.h
+++ b/include/linux/mfd/asic3.h
@@ -20,8 +20,6 @@ struct asic3_platform_data {
         u16 *gpio_config;
         unsigned int gpio_config_num;
 
-        unsigned int bus_shift;
-
         unsigned int irq_base;
 
         unsigned int gpio_base;
@@ -498,6 +496,7 @@ struct asic3_platform_data {
 #define ASIC3_SDIO_CTRL_LEDCtrl              0x7C
 #define ASIC3_SDIO_CTRL_SoftwareReset        0x1C0
 
-#define ASIC3_MAP_SIZE                       0x2000
+#define ASIC3_MAP_SIZE_32BIT    0x2000
+#define ASIC3_MAP_SIZE_16BIT    0x1000
 
 #endif /* __ASIC3_H__ */