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>
diff --git a/drivers/mfd/asic3.c b/drivers/mfd/asic3.c
index f2fb233..3b870e7 100644
--- a/drivers/mfd/asic3.c
+++ b/drivers/mfd/asic3.c
@@ -313,6 +313,7 @@
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 @@
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 @@
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);
