Linux kernel device driver address mapping notes

#include <asm/io.h>
#define ioremap(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE)
//cookie indicates the physical address, size indicates the mapping size. ioremap maps the specified physical address to an idle virtual address void __iomem *
__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
{
return __arm_ioremap_caller(phys_addr, size, mtype,
__builtin_return_address(0));
}

ioread8(address)/readb()
ioread16(address)/readw()
ioread32(address)/readl()

iowrite8(value, address) / writeb
iowrite16(value, address) / writew
iowrite32(value, address) / writel

#include <asm/sizes.h>
SZ_4K
SZ_1M