SH7760,7780,7785 sh-sci.c bugfix

hi all

I found bug in sh-sci.c

    $ echo "A" > /dev/ttySC[0-2]           open()
                                           write()
                                           close()

send more than 128 bytes into ttySC[0-2] from other machine.

$ echo "A" > /dev/ttySC[0-2] open()

kernel stoped.

Because.

SCRFDR counts upto 0x80 not 0x7F.
if recive fifo has 128 charactors, SCRFDR indicates 0x80.

               return sci_in(port, SCRFDR) & 0x7f;

this code returns zero , so ISR 's never finished.

--- linux-2.6.24_cat/drivers/serial/sh-sci.c-old 2008-03-06 19:
40:13.000000000 +0900
+++ linux-2.6.24_cat/drivers/serial/sh-sci.c 2008-03-06 19:40:27.
000000000 +0900
@@ -412,12 +412,12 @@

     defined(CONFIG_CPU_SUBTYPE_SH7785)

static inline int scif_txroom(struct uart_port *port) {
- return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0x7f);
+ return SCIF_TXROOM_MAX - (sci_in(port, SCTFDR) & 0xff);
}

static inline int scif_rxroom(struct uart_port *port) {
- return sci_in(port, SCRFDR) & 0x7f;
+ return sci_in(port, SCRFDR) & 0xff;
}
#else
static inline int scif_txroom(struct uart_port *port)