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4a3f77ea77
Switch to iomapped register access as a prerequisite for adding support for MMIO register access. This changes replaces the delayed inb_p()/outb_p() calls with calls to ioread8()/iowrite8() which don't have this extra delay. According to Documentation/driver-api/device-io.rst the _p versions are needed for ISA device access only, therefore switching to the non-delayed versions should not cause problems. However a certain risk remains, which on the other hand is significantly reduced by the fact that recent systems will use MMIO instead of PIO. ICH7 datasheet from 2012 mentions already that SMBus register space is also memory-mapped. So all systems from at least the last 10 yrs should be safe. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Andi Shyti <andi.shyti@kernel.org> Link: https://lore.kernel.org/r/67535b17-c3fb-4507-b083-9c1884b4dd7d@gmail.com |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.