arch/mips/rb532/serial.c

   1 /*
   2  *  BRIEF MODULE DESCRIPTION
   3  *     Serial port initialisation.
   4  *
   5  *  Copyright 2004 IDT Inc. (rischelp@idt.com)
   6  *
   7  *  This program is free software; you can redistribute  it and/or modify it
   8  *  under  the terms of  the GNU General  Public License as published by the
   9  *  Free Software Foundation;  either version 2 of the  License, or (at your
  10  *  option) any later version.
  11  *
  12  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  13  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  14  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  15  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  16  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  17  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  18  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  19  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  20  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  21  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  22  *
  23  *  You should have received a copy of the  GNU General Public License along
  24  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  25  *  675 Mass Ave, Cambridge, MA 02139, USA.
  26  */
  27
  28 #include <linux/init.h>
  29 #include <linux/tty.h>
  30 #include <linux/serial_core.h>
  31 #include <linux/serial_8250.h>
  32
  33 #include <asm/serial.h>
  34 #include <asm/mach-rc32434/rb.h>
  35
  36 extern unsigned int idt_cpu_freq;
  37
  38 static struct uart_port rb532_uart = {
  39         .flags = UPF_BOOT_AUTOCONF,
  40         .line = 0,
  41         .irq = UART0_IRQ,
  42         .iotype = UPIO_MEM,
  43         .membase = (char *)KSEG1ADDR(REGBASE + UART0BASE),
  44         .regshift = 2
  45 };
  46
  47 int __init setup_serial_port(void)
  48 {
  49         rb532_uart.uartclk = idt_cpu_freq;
  50
  51         return early_serial_setup(&rb532_uart);
  52 }
  53 arch_initcall(setup_serial_port);