diff options
| author | Joerg Roedel <jroedel@suse.de> | 2015-07-16 08:29:13 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-24 00:49:42 (GMT) |
| commit | da891641b6c92e260966dfce3dd93111d08656c8 (patch) | |
| tree | de80d6df1227a72d0bfa45f876445ac4a8877dce /drivers/tty/serial/8250 | |
| parent | ee3ad90be5ec5e94a45aac597a23b1050cd4f1b0 (diff) | |
| download | linux-da891641b6c92e260966dfce3dd93111d08656c8.tar.xz | |
serial: 8250: Do XR17V35X specific wakeup in serial8250_do_startup
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>
Diffstat (limited to 'drivers/tty/serial/8250')
| -rw-r--r-- | drivers/tty/serial/8250/8250_port.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index de6655d..54e6c8d 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -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()) |