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serial: 8250: Decouple RSA probe

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Prepare for 8250 split; separate RSA probe and resource management
from base port operations. Override base port operations for the
config_port(), request_port() and release_port() methods to
implement the optional RSA probe and resource management only in
the universal/legacy 8250 driver.

Introduce 'probe' flags for 8250 ports, which allows drivers higher
up the driver stack to enable optional probes.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2015-02-24 14:25:14 -05:00 • committed by Greg Kroah-Hartman
parent 3b81c26c92
commit 4037539370
3 changed files with 78 additions and 39 deletions
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2
include/linux/serial_8250.h
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@ -102,6 +102,8 @@ struct uart_8250_port {
unsigned char canary; /* non-zero during system sleep
* if no_console_suspend
*/
unsigned char probe;
#define UART_PROBE_RSA (1 << 0)
/*
* Some bits in registers are cleared on a read, so they must