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tty: serial8250: add helpers for the DesignWare 8250

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The Synopsys DesignWare 8250 is an 8250 that has an extra interrupt that
gets raised when writing to the LCR when busy.  To handle this we need
special serial_out, serial_in and handle_irq methods.  Add a new
function serial8250_use_designware_io() that configures a uart_port with
these accessors.

Cc: Alan Cox <alan@linux.intel.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jamie Iles
2011-08-16 17:47:46 +01:00
committed by Greg Kroah-Hartman
parent 4834d02897
commit 6b1a98d1c4
4 changed files with 115 additions and 0 deletions
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8
include/linux/serial_8250.h
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@@ -86,5 +86,13 @@ int serial8250_handle_irq(struct uart_port *port, unsigned int iir);
extern void serial8250_set_isa_configurator(void (*v)
(int port, struct uart_port *up,
unsigned short *capabilities));
#ifndef SERIAL_8250_DW
extern int serial8250_use_designware_io(struct uart_port *up);
#else
static inline int serial8250_use_designware_io(struct uart_port *up)
{
return -EIO;
}
#endif
#endif