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));
}1. Virtual address after mapping from physical address
2. 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 Summarize The above is the full content of this article. I hope that the content of this article will have certain reference learning value for your study or work. Thank you for your support of 123WORDPRESS.COM. If you want to learn more about this, please check out the following links You may also be interested in:
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