Webu32 cur = 0; u32 pos = offset / 4 + i; cur = ioread32 (mpp_dev->reg_base + pos * 4); pr_info ("get reg [%03d]: %08x\n", pos, cur); } #endif The loop with iowrite32 writes consecutive u32 words from buffer to consecutive IO memory locations. But iowrite32_rep writes consecutive u32 words from buffer to the same IO memory location. http://blog.chinaunix.net/uid-29616823-id-4249740.html

Linux系统对IO端口和IO内存的管理 - 知乎 - 知乎专栏

WebThe loop with iowrite32 writes consecutive u32 words from buffer to consecutive IO memory locations. But iowrite32_rep writes consecutive u32 words from buffer to the … Web24 mrt. 2012 · Hello, I’m programming a loadable kernel module to access the gpio’s. But I 've problems when i tried to insert the module and specifically when I use the “iowrite32 ( )” function. But when I use the “ioread32 ()” function, I don’t have any problems. My module name is “gpio_conf.ko” and the kernel messages that i receive when I try to insert the … greed sound effect

Use 32bit ops to perform ioread/write64 - Stack Overflow

WebFrom: Gevorg Sahakyan dwc2_readl_rep/dwc2_writel_rep functions using readl/writel in a loop. Signed-off-by: Gevorg Sahakyan … Web28 jun. 2024 · 简单来说，如果你在写驱动程序时zhi候，碰到一些IO操作，在逻辑上 不能归类到read，不能归类到write，那就可以认为是ioctl 的部分。 read和write应该是写入和读出数据的 ，应该是作为单纯的数据交换的方式来处理。 而ioctl则是控制read和write一些选项的。 比如：你做了一个通用的读写IO端口的驱动模块。 read和write是从端口读写数据的，但是 … WebBased on advise from Jeff, as described in the e-mail: [PATCH] Clarify pci_iomap() usage for MMIO-only devices we shouldn't use ioread32()/iowrite32() unless we really have a need to otherwise we're creating an unnecessary branch on read/write. Lets revert this back to readl()/writel() as our devices so far have been MMIO-only. flot antonyme