z8530_read_port(9) - phpMan
Z8530_READ_PORT(9) Internal Functions Z8530_READ_PORT(9)
z8530_read_port - Architecture specific interface function
int z8530_read_port(unsigned long p);
port to read
Provided port access methods. The Comtrol SV11 requires no delays between accesses and
uses PC I/O. Some drivers may need a 5uS delay
In the longer term this should become an architecture specific section so that this can
become a generic driver interface for all platforms. For now we only handle PC I/O ports
with or without the dread 5uS sanity delay.
The caller must hold sufficient locks to avoid violating the horrible 5uS delay rule.
Alan Cox <alan AT lxorguk.uk>
Kernel Hackers Manual 4.8. January 2017 Z8530_READ_PORT(9)