8250: Serial driver changes to support future Cavium OCTEON serial patches.

In order to use Cavium OCTEON specific serial i/o drivers, we first
patch the 8250 driver to use replaceable I/O functions.  Compatible
I/O functions are added for existing iotypeS.

An added benefit of this change is that it makes it easy to factor
some of the existing special cases out to board/SOC specific support
code.

The alternative is to load up 8250.c with a bunch of OCTEON specific
iotype code and bug work-arounds.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Tomaso Paoletti <tpaoletti@caviumnetworks.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index 3d37c94abbc8..77d83d929f2c 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -28,6 +28,8 @@ struct plat_serial8250_port {
         unsigned char   iotype;         /* UPIO_* */
         unsigned char   hub6;
         upf_t           flags;          /* UPF_* flags */
+        unsigned int    (*serial_in)(struct uart_port *, int);
+        void            (*serial_out)(struct uart_port *, int, int);
 };
 
 /*
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 2395969faa04..60061f44f3d8 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -248,6 +248,8 @@ struct uart_port {
         spinlock_t              lock;                   /* port lock */
         unsigned long           iobase;                 /* in/out[bwl] */
         unsigned char __iomem   *membase;               /* read/write[bwl] */
+        unsigned int            (*serial_in)(struct uart_port *, int);
+        void                    (*serial_out)(struct uart_port *, int, int);
         unsigned int            irq;                    /* irq number */
         unsigned int            uartclk;                /* base uart clock */
         unsigned int            fifosize;               /* tx fifo size */