>     Why you chose to use ioread32() and iowrite32() if your device is 
> strictly 
> memory mapped? Those functions add some overhead, and boil down to readl() 
> and 

There are distinct portability advantages but you shouldn't mix
ioread32/iowrite32 with ioremap as that isn't guaranteed to work.
readl/writel does fine and fixes up the driver.

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