serial8250: Introduce serial8250_register_8250_port()

Introduce yet another 8250 registration function.
This time it is serial8250_register_8250_port() and it
allows us to register 8250 hardware instances using struct
uart_8250_port. The new function makes it possible to
register 8250 hardware that makes use of 8250 specific
callbacks such as ->dl_read() and ->dl_write().

Signed-off-by: Magnus Damm <damm@opensource.se>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250.c b/drivers/tty/serial/8250/8250.c
index 662188d..47d061b 100644 (file)
--- a/drivers/tty/serial/8250/8250.c
+++ b/drivers/tty/serial/8250/8250.c
@@ -3112,7 +3112,7 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *
 }
 
 /**
- *     serial8250_register_port - register a serial port
+ *     serial8250_register_8250_port - register a serial port
  *     @port: serial port template
  *
  *     Configure the serial port specified by the request. If the
@@ -3124,52 +3124,56 @@ static struct uart_8250_port *serial8250_find_match_or_unused(struct uart_port *
  *
  *     On success the port is ready to use and the line number is returned.
  */
-int serial8250_register_port(struct uart_port *port)
+int serial8250_register_8250_port(struct uart_8250_port *up)
 {
        struct uart_8250_port *uart;
        int ret = -ENOSPC;
 
-       if (port->uartclk == 0)
+       if (up->port.uartclk == 0)
                return -EINVAL;
 
        mutex_lock(&serial_mutex);
 
-       uart = serial8250_find_match_or_unused(port);
+       uart = serial8250_find_match_or_unused(&up->port);
        if (uart) {
                uart_remove_one_port(&serial8250_reg, &uart->port);
 
-               uart->port.iobase       = port->iobase;
-               uart->port.membase      = port->membase;
-               uart->port.irq          = port->irq;
-               uart->port.irqflags     = port->irqflags;
-               uart->port.uartclk      = port->uartclk;
-               uart->port.fifosize     = port->fifosize;
-               uart->port.regshift     = port->regshift;
-               uart->port.iotype       = port->iotype;
-               uart->port.flags        = port->flags | UPF_BOOT_AUTOCONF;
-               uart->port.mapbase      = port->mapbase;
-               uart->port.private_data = port->private_data;
-               if (port->dev)
-                       uart->port.dev = port->dev;
-
-               if (port->flags & UPF_FIXED_TYPE)
-                       serial8250_init_fixed_type_port(uart, port->type);
+               uart->port.iobase       = up->port.iobase;
+               uart->port.membase      = up->port.membase;
+               uart->port.irq          = up->port.irq;
+               uart->port.irqflags     = up->port.irqflags;
+               uart->port.uartclk      = up->port.uartclk;
+               uart->port.fifosize     = up->port.fifosize;
+               uart->port.regshift     = up->port.regshift;
+               uart->port.iotype       = up->port.iotype;
+               uart->port.flags        = up->port.flags | UPF_BOOT_AUTOCONF;
+               uart->port.mapbase      = up->port.mapbase;
+               uart->port.private_data = up->port.private_data;
+               if (up->port.dev)
+                       uart->port.dev = up->port.dev;
+
+               if (up->port.flags & UPF_FIXED_TYPE)
+                       serial8250_init_fixed_type_port(uart, up->port.type);
 
                set_io_from_upio(&uart->port);
                /* Possibly override default I/O functions.  */
-               if (port->serial_in)
-                       uart->port.serial_in = port->serial_in;
-               if (port->serial_out)
-                       uart->port.serial_out = port->serial_out;
-               if (port->handle_irq)
-                       uart->port.handle_irq = port->handle_irq;
+               if (up->port.serial_in)
+                       uart->port.serial_in = up->port.serial_in;
+               if (up->port.serial_out)
+                       uart->port.serial_out = up->port.serial_out;
+               if (up->port.handle_irq)
+                       uart->port.handle_irq = up->port.handle_irq;
                /*  Possibly override set_termios call */
-               if (port->set_termios)
-                       uart->port.set_termios = port->set_termios;
-               if (port->pm)
-                       uart->port.pm = port->pm;
-               if (port->handle_break)
-                       uart->port.handle_break = port->handle_break;
+               if (up->port.set_termios)
+                       uart->port.set_termios = up->port.set_termios;
+               if (up->port.pm)
+                       uart->port.pm = up->port.pm;
+               if (up->port.handle_break)
+                       uart->port.handle_break = up->port.handle_break;
+               if (up->dl_read)
+                       uart->dl_read = up->dl_read;
+               if (up->dl_write)
+                       uart->dl_write = up->dl_write;
 
                if (serial8250_isa_config != NULL)
                        serial8250_isa_config(0, &uart->port,
@@ -3183,6 +3187,29 @@ int serial8250_register_port(struct uart_port *port)
 
        return ret;
 }
+EXPORT_SYMBOL(serial8250_register_8250_port);
+
+/**
+ *     serial8250_register_port - register a serial port
+ *     @port: serial port template
+ *
+ *     Configure the serial port specified by the request. If the
+ *     port exists and is in use, it is hung up and unregistered
+ *     first.
+ *
+ *     The port is then probed and if necessary the IRQ is autodetected
+ *     If this fails an error is returned.
+ *
+ *     On success the port is ready to use and the line number is returned.
+ */
+int serial8250_register_port(struct uart_port *port)
+{
+       struct uart_8250_port up;
+
+       memset(&up, 0, sizeof(up));
+       memcpy(&up.port, port, sizeof(*port));
+       return serial8250_register_8250_port(&up);
+}
 EXPORT_SYMBOL(serial8250_register_port);
 
 /**

diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h
index a522fd9..10dbce5 100644 (file)
--- a/include/linux/serial_8250.h
+++ b/include/linux/serial_8250.h
@@ -69,6 +69,7 @@ enum {
 struct uart_port;
 struct uart_8250_port;
 
+int serial8250_register_8250_port(struct uart_8250_port *);
 int serial8250_register_port(struct uart_port *);
 void serial8250_unregister_port(int line);
 void serial8250_suspend_port(int line);