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com_mainbus.c revision 1.9 
      1 /*	$NetBSD: com_mainbus.c,v 1.9 2004/08/29 16:14:15 tsutsui Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2000 Soren S. Jorvang.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions, and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     25  * SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: com_mainbus.c,v 1.9 2004/08/29 16:14:15 tsutsui Exp $");
     30 
     31 #include <sys/param.h>
     32 #include <sys/systm.h>
     33 #include <sys/device.h>
     34 #include <sys/termios.h>
     35 
     36 #include <machine/autoconf.h>
     37 #include <machine/intr.h>
     38 #include <machine/bus.h>
     39 #include <machine/nvram.h>
     40 #include <machine/bootinfo.h>
     41 
     42 #include <dev/ic/comreg.h>
     43 #include <dev/ic/comvar.h>
     44 
     45 #include <cobalt/dev/com_mainbusvar.h>
     46 
     47 extern int console_present;
     48 
     49 struct com_mainbus_softc {
     50 	struct com_softc sc_com;
     51 	void *sc_ih;
     52 };
     53 
     54 #define COM_MAINBUS_FREQ	(COM_FREQ * 10)
     55 #define CONMODE ((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) | CS8) /* 8N1 */
     56 
     57 static int	com_mainbus_probe(struct device *, struct cfdata *, void *);
     58 static void	com_mainbus_attach(struct device *, struct device *, void *);
     59 
     60 CFATTACH_DECL(com_mainbus, sizeof(struct com_mainbus_softc),
     61     com_mainbus_probe, com_mainbus_attach, NULL, NULL);
     62 
     63 int
     64 com_mainbus_probe(struct device *parent, struct cfdata *match, void *aux)
     65 {
     66 
     67 	return console_present != 0;
     68 }
     69 
     70 void
     71 com_mainbus_attach(struct device *parent, struct device *self, void *aux)
     72 {
     73 	struct com_mainbus_softc *msc = (void *)self;
     74 	struct com_softc *sc = &msc->sc_com;
     75 	struct mainbus_attach_args *maa = aux;
     76 
     77 	sc->sc_iot = maa->ma_iot;
     78 	sc->sc_iobase = maa->ma_addr;
     79 
     80 #if 0	/* XXX */
     81 	if (!com_is_console(sc->sc_iot, sc->sc_iobase, &sc->sc_ioh) &&
     82 	    bus_space_map(sc->sc_iot, sc->sc_iobase, COM_NPORTS, 0,
     83 	    &sc->sc_ioh)) {
     84 		printf(": can't map i/o space\n");
     85 		return;
     86 	}
     87 #else
     88 	sc->sc_ioh = maa->ma_ioh;
     89 #endif
     90 
     91 	sc->sc_frequency = COM_MAINBUS_FREQ;
     92 
     93 	com_attach_subr(sc);
     94 
     95 	cpu_intr_establish(maa->ma_level, IPL_SERIAL, comintr, sc);
     96 
     97 	return;
     98 }
     99 
    100 void
    101 com_mainbus_cnprobe(struct consdev *cn)
    102 {
    103 	struct btinfo_flags *bi_flags;
    104 
    105 	/*
    106 	 * Linux code has a comment that serial console must be probed
    107 	 * early, otherwise the value which allows to detect serial port
    108 	 * could be overwritten. Okay, probe here and record the result
    109 	 * for the future use.
    110 	 *
    111 	 * Note that if the kernel was booted with a boot loader,
    112 	 * the latter *has* to provide a flag indicating whether console
    113 	 * is present or not because the value might be overwritten by
    114 	 * the loaded kernel.
    115 	 */
    116 	if ((bi_flags = lookup_bootinfo(BTINFO_FLAGS)) == NULL) {
    117 		/* No boot information, probe console now */
    118 		console_present = *(volatile u_int32_t *)
    119 					MIPS_PHYS_TO_KSEG1(0x0020001c);
    120 	} else {
    121 		/* Get the value determined by the boot loader. */
    122 		console_present = bi_flags->bi_flags & BI_SERIAL_CONSOLE;
    123 	}
    124 
    125 	cn->cn_pri = (console_present != 0) ? CN_NORMAL : CN_DEAD;
    126 }
    127 
    128 void
    129 com_mainbus_cninit(struct consdev *cn)
    130 {
    131 
    132 	comcnattach(0, 0x1c800000, 115200, COM_MAINBUS_FREQ, COM_TYPE_NORMAL,
    133 	    CONMODE);
    134 }
    135