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serial: 8250: Do XR17V35X specific wakeup in serial8250_do_startup

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The XR17V35X UART needs the ECB bit set in its XR_EFR
register to enable access to IER [7:5], ISR [5:4], FCR[5:4],
MCR[7:5], and MSR [7:0].

Also reset the IER register to mask interrupts after access
to all bits of this register has been enabled.

This makes my 8-port XR17V35X working with the in-kernel
serial driver.

Cc: Joe Schultz <jschultz@xes-inc.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Reviewed-by: Peter Hurley <peter@hurleysoftware.com>
Reviewed-by: Michael Welling <mwelling@ieee.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Joerg Roedel 2015-07-16 10:29:13 +02:00 committed by Greg Kroah-Hartman
parent ee3ad90be5
commit da891641b6
1 changed files with 15 additions and 0 deletions
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15
drivers/tty/serial/8250/8250_port.c
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@ -1834,6 +1834,21 @@ int serial8250_do_startup(struct uart_port *port)
*/
enable_rsa(up);
#endif
if (port->type == PORT_XR17V35X) {
/*
* First enable access to IER [7:5], ISR [5:4], FCR [5:4],
* MCR [7:5] and MSR [7:0]
*/
serial_port_out(port, UART_XR_EFR, UART_EFR_ECB);
/*
* Make sure all interrups are masked until initialization is
* complete and the FIFOs are cleared
*/
serial_port_out(port, UART_IER, 0);
}
/*
* Clear the FIFO buffers and disable them.
* (they will be reenabled in set_termios())