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Currently the IOMEM AHCI registers space is mapped by means of the two functions invocation: platform_get_resource() is used to get the very first memory resource and devm_ioremap_resource() is called to remap that resource. Device-managed kernel API provides a handy wrapper to perform the same in single function call: devm_platform_ioremap_resource(). While at it seeing many AHCI platform drivers rely on having the AHCI CSR space marked with "ahci" name let's first try to find and remap the CSR IO-mem with that name and only if it fails fallback to getting the very first registers space platform resource. Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Reviewed-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
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 Restructured Text 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.