U6715 16550A serial driver support

UART Features extract from STEricsson U6715 data-sheet (arm926 SoC for mobile phone):
* Fully compatible with industry standard 16C550 and 16C450 from various
manufacturers
* RX and TX 64 byte FIFO reduces CPU interrupts
* Full double buffering
* Modem control signals include CTS, RTS, (and DSR, DTR on UART1 only)
* Automatic baud rate selection
* Manual or automatic RTS/CTS smart hardware flow control
* Programmable serial characteristics:
– Baud rate generation (50 to 3.25M baud)
– 5, 6, 7 or 8-bit characters
– Even, odd or no-parity bit generation and detection
– 1, 1.5 or 2 stop bit generation
* Independent control of transmit, receive, line status, data set interrupts and FIFOs
* Full status-reporting capabilities
* Separate DMA signaling for RX and TX
* Timed interrupt to spread receive interrupt on known duration
* DMA time-out interrupt to allow detection of end of reception
* Carkit pulse coding and decoding compliant with USB carkit control interface [40]

In 16550A auto-configuration, if the fifo size is 64 then it's an U6 16550A port
Add set_termios hook & export serial8250_do_set_termios to change uart
clock following baudrate

Signed-off-by: Philippe Langlais <philippe.langlais@stericsson.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 10 insertions, 1 deletions

diff --git a/include/linux/serial.h b/include/linux/serial.h
index ef914061511e..1ebc694a6d52 100644
--- a/include/linux/serial.h
+++ b/include/linux/serial.h
@@ -77,7 +77,8 @@ struct serial_struct {
 #define PORT_16654      11
 #define PORT_16850      12
 #define PORT_RSA        13      /* RSA-DV II/S card */
-#define PORT_MAX        13
+#define PORT_U6_16550A  14
+#define PORT_MAX        14
 
 #define SERIAL_IO_PORT  0
 #define SERIAL_IO_HUB6  1
diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index fb46aba11fb5..7638deaaba65 100644
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -32,6 +32,9 @@ struct plat_serial8250_port {
         unsigned int    type;           /* If UPF_FIXED_TYPE */
         unsigned int    (*serial_in)(struct uart_port *, int);
         void            (*serial_out)(struct uart_port *, int, int);
+        void            (*set_termios)(struct uart_port *,
+                                       struct ktermios *new,
+                                       struct ktermios *old);
 };
 
 /*
@@ -71,5 +74,7 @@ extern int early_serial_setup(struct uart_port *port);
 extern int serial8250_find_port(struct uart_port *p);
 extern int serial8250_find_port_for_earlycon(void);
 extern int setup_early_serial8250_console(char *cmdline);
+extern void serial8250_do_set_termios(struct uart_port *port,
+                struct ktermios *termios, struct ktermios *old);
 
 #endif
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index f8fce351463d..8129ca2d57e3 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -282,6 +282,9 @@ struct uart_port {
         unsigned char __iomem   *membase;               /* read/write[bwl] */
         unsigned int            (*serial_in)(struct uart_port *, int);
         void                    (*serial_out)(struct uart_port *, int, int);
+        void                    (*set_termios)(struct uart_port *,
+                                               struct ktermios *new,
+                                               struct ktermios *old);
         unsigned int            irq;                    /* irq number */
         unsigned long           irqflags;               /* irq flags  */
         unsigned int            uartclk;                /* base uart clock */