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      1 /*	$NetBSD: com_ebus.c,v 1.17 2018/12/08 17:46:13 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Charles M. Hannum.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: com_ebus.c,v 1.17 2018/12/08 17:46:13 thorpej Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 #include <sys/device.h>
     38 #include <sys/termios.h>
     39 
     40 #include <sys/bus.h>
     41 #include <machine/autoconf.h>
     42 #include <machine/intr.h>
     43 
     44 #include <dev/ebus/ebusreg.h>
     45 #include <dev/ebus/ebusvar.h>
     46 
     47 #include <dev/ic/comreg.h>
     48 #include <dev/ic/comvar.h>
     49 
     50 struct com_ebus_softc {
     51 	struct com_softc ebsc_com;	/* real "com" softc */
     52 
     53 	/* this space for rent */
     54 };
     55 
     56 static int com_ebus_match(device_t, cfdata_t , void *);
     57 static void com_ebus_attach(device_t, device_t, void *);
     58 
     59 CFATTACH_DECL_NEW(com_ebus, sizeof(struct com_ebus_softc),
     60     com_ebus_match, com_ebus_attach, NULL, NULL);
     61 
     62 static int
     63 com_ebus_match(device_t parent, cfdata_t cf, void *aux)
     64 {
     65 	struct ebus_attach_args *ea = aux;
     66 	bus_space_handle_t ioh;
     67 	int match;
     68 
     69 	if (strcmp(ea->ea_name, "su") != 0)
     70 		return (0);
     71 
     72 	match = 0;
     73 	if (bus_space_map(ea->ea_bustag, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]),
     74 			  ea->ea_reg[0].size, 0, &ioh) == 0)
     75 	{
     76 		match = comprobe1(ea->ea_bustag, ioh);
     77 		bus_space_unmap(ea->ea_bustag, ioh, ea->ea_reg[0].size);
     78 	}
     79 
     80 	return (match);
     81 }
     82 
     83 static void
     84 com_ebus_attach(device_t parent, device_t self, void *aux)
     85 {
     86 	struct com_ebus_softc *ebsc = device_private(self);
     87 	struct com_softc *sc = &ebsc->ebsc_com;
     88 	struct ebus_attach_args *ea = aux;
     89 	bus_space_tag_t iot;
     90 	bus_space_handle_t ioh;
     91 	bus_addr_t iobase;
     92 
     93 	sc->sc_dev = self;
     94 	iot = ea->ea_bustag;
     95 	iobase = EBUS_ADDR_FROM_REG(&ea->ea_reg[0]);
     96 	sc->sc_frequency = COM_FREQ;
     97 	sc->sc_hwflags = COM_HW_NO_TXPRELOAD;
     98 
     99 	/*
    100 	 * XXX: It would be nice to be able to split console input and
    101 	 * output to different devices.  For now switch to serial
    102 	 * console if PROM stdin is on serial (so that we can use DDB).
    103 	 */
    104 	if (prom_instance_to_package(prom_stdin()) == ea->ea_node)
    105 		comcnattach(iot, iobase, B9600, sc->sc_frequency,
    106 		    COM_TYPE_NORMAL, (CLOCAL | CREAD | CS8));
    107 
    108 	if (!com_is_console(iot, iobase, &ioh)
    109 	    && bus_space_map(iot, iobase, ea->ea_reg[0].size,
    110 			     0, &ioh) != 0)
    111 	{
    112 		aprint_error(": unable to map device registers\n");
    113 		return;
    114 	}
    115 
    116 	com_init_regs(&sc->sc_regs, iot, ioh, iobase);
    117 
    118 	com_attach_subr(sc);
    119 
    120 	if (ea->ea_nintr != 0)
    121 		(void)bus_intr_establish(iot, ea->ea_intr[0], IPL_SERIAL,
    122 					 comintr, sc);
    123 }
    124