在2025年1月14日一月 上午9:59，Arnd Bergmann写道： [...] > > This probably requires calling set_io_port_base() with the > actual virtual address rather than self-assigning the > uninitialized mips_io_port_base. > > I assume the reason for loongson64 being different from every > other mips platform is the same as why it calls into the > logic_pio_register_range() directly. I don't understand that > code, but it's probably because it has ISA/LPC devices that > are directly wired to a non-memory-mapped set of registers > instead of them being behind a PCI bridge like the other > platforms. The idea of logic_pio is to have a more generic > way to redirect arbitrary port ranges into bus specific > function calls, where normal PCI (on non-x86) assumes that > all I/O ports are mapped into a small contiguous ranges > of virtual addresses. That's correct, Loongson systems has a memory-mapped LPC bridge accessible via MMIO. We are handling registration and mapping process here. It also has ioport capable PCI bridge, which will be taken care by platform code. I think current problem of logic_pio is it handles creation of mappings and PIO range registration separately. Thanks > > Arnd -- - Jiaxun
