FreeBSD/Linux Kernel Cross Reference
sys/dev/uart/uart_cpu_alpha.c

     /*-
      * Copyright (c) 2003, 2004 Marcel Moolenaar
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      *
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    #include <sys/reboot.h>
    
    #include <machine/bus.h>
    #include <machine/md_var.h>
    #include <machine/rpb.h>
    
    #include <dev/uart/uart.h>
    #include <dev/uart/uart_cpu.h>
    
    bus_space_tag_t uart_bus_space_io;
    bus_space_tag_t uart_bus_space_mem;
    
    int
    uart_cpu_eqres(struct uart_bas *b1, struct uart_bas *b2)
    {
    
            if (b1->bsh != b2->bsh)
                    return (0);
            if (b1->bst == b2->bst)
                    return (1);
    
            /* Chipset drivers can have redefined the ISA tags. Deal with it. */
            if ((b1->bst == uart_bus_space_io && b2->bst == busspace_isa_io) ||
                (b1->bst == busspace_isa_io && b2->bst == uart_bus_space_io))
                    return (1);
            if ((b1->bst == uart_bus_space_mem && b2->bst == busspace_isa_mem) ||
                (b1->bst == busspace_isa_mem && b2->bst == uart_bus_space_mem))
                    return (1);
    
            return (0);
    }
    
    int
    uart_cpu_getdev(int devtype, struct uart_devinfo *di)
    {
            static int init = 0;
            struct ctb *ctb;
            unsigned int i, ivar;
    
            if (!init) {
                    uart_bus_space_io = busspace_isa_io;
                    uart_bus_space_mem = busspace_isa_mem;
                    init = 1;
            }
    
            if (devtype == UART_DEV_CONSOLE) {
                    ctb = (struct ctb *)(((caddr_t)hwrpb) + hwrpb->rpb_ctb_off);
                    if (ctb->ctb_term_type != CTB_PRINTERPORT)
                            return (ENXIO);
                    boothowto |= RB_SERIAL;
                    di->ops = uart_ns8250_ops;
                    di->bas.chan = 0;
                    di->bas.bst = uart_bus_space_io;
                    if (bus_space_map(di->bas.bst, 0x3f8, 8, 0, &di->bas.bsh) != 0)
                            return (ENXIO);
                    di->bas.regshft = 0;
                    di->bas.rclk = 0;
                    di->baudrate = 9600;
                    di->databits = 8;
                    di->stopbits = 1;
                    di->parity = UART_PARITY_NONE;
                    return (0);
            }
    
            /* Check the environment. */
            if (uart_getenv(devtype, di) == 0)
                    return (0);
   
           /*
            * Scan the hints. We only try units 0 to 3 (inclusive). This
            * covers the ISA legacy where 4 UARTs had their resources
            * predefined.
            */
           for (i = 0; i < 4; i++) {
                   if (resource_int_value("uart", i, "flags", &ivar))
                           continue;
                   if (devtype == UART_DEV_DBGPORT && !UART_FLAGS_DBGPORT(ivar))
                           continue;
                   /*
                    * We have a possible device. Make sure it's enabled and
                    * that we have an I/O port.
                    */
                   if (resource_int_value("uart", i, "disabled", &ivar) == 0 &&
                       ivar != 0)
                           continue;
                   if (resource_int_value("uart", i, "port", &ivar) != 0 ||
                       ivar == 0)
                           continue;
                   /*
                    * Got it. Fill in the instance and return it. We assume we
                    * only have ns8250 and successors on alpha.
                    */
                   di->ops = uart_ns8250_ops;
                   di->bas.chan = 0;
                   di->bas.bst = uart_bus_space_io;
                   if (bus_space_map(di->bas.bst, ivar, 8, 0, &di->bas.bsh) != 0)
                           continue;
                   di->bas.regshft = 0;
                   di->bas.rclk = 0;
                   if (resource_int_value("uart", i, "baud", &ivar) != 0)
                           ivar = 0;
                   di->baudrate = ivar;
                   di->databits = 8;
                   di->stopbits = 1;
                   di->parity = UART_PARITY_NONE;
                   return (0);
           }
   
           return (ENXIO);
   }
   
   void
   uart_cpu_identify(driver_t *driver, device_t parent)
   {
    
   }

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