arch/mips/sgi-ip27/ip27-dbgio.c

   1 /*
   2  *  This program is free software; you can redistribute  it and/or modify it
   3  *  under  the terms of  the GNU General  Public License as published by the
   4  *  Free Software Foundation;  either version 2 of the  License, or (at your
   5  *  option) any later version.
   6  *
   7  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
   8  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
   9  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  10  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  11  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  12  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  13  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  14  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  15  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  16  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  17  *
  18  *  You should have received a copy of the  GNU General Public License along
  19  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  20  *  675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  * Copyright 2004 Ralf Baechle <ralf@linux-mips.org>
  23  */
  24 #include <asm/sn/addrs.h>
  25 #include <asm/sn/sn0/hub.h>
  26 #include <asm/sn/klconfig.h>
  27 #include <asm/sn/ioc3.h>
  28 #include <asm/sn/sn_private.h>
  29
  30 #include <linux/serial.h>
  31 #include <linux/serial_core.h>
  32 #include <linux/serial_reg.h>
  33
  34 #define IOC3_CLK        (22000000 / 3)
  35 #define IOC3_FLAGS      (0)
  36
  37 static inline struct ioc3_uartregs *console_uart(void)
  38 {
  39         struct ioc3 *ioc3;
  40
  41         ioc3 = (struct ioc3 *)KL_CONFIG_CH_CONS_INFO(get_nasid())->memory_base;
  42
  43         return &ioc3->sregs.uarta;
  44 }
  45
  46 unsigned char getDebugChar(void)
  47 {
  48         struct ioc3_uartregs *uart = console_uart();
  49
  50         while ((uart->iu_lsr & UART_LSR_DR) == 0);
  51         return uart->iu_rbr;
  52 }
  53
  54 void putDebugChar(unsigned char c)
  55 {
  56         struct ioc3_uartregs *uart = console_uart();
  57
  58         while ((uart->iu_lsr & UART_LSR_THRE) == 0);
  59         uart->iu_thr = c;
  60 }