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      1 /*	$NetBSD: com_gsc.c,v 1.2 2018/12/08 17:46:11 thorpej Exp $	*/
      2 
      3 /*	$OpenBSD: com_gsc.c,v 1.8 2000/03/13 14:39:59 mickey Exp $	*/
      4 
      5 /*
      6  * Copyright (c) 1998-2004 Michael Shalayeff
      7  * All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT,
     22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     24  * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
     27  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     28  * THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/cdefs.h>
     32 __KERNEL_RCSID(0, "$NetBSD: com_gsc.c,v 1.2 2018/12/08 17:46:11 thorpej Exp $");
     33 
     34 #include "opt_kgdb.h"
     35 
     36 #include <sys/param.h>
     37 #include <sys/systm.h>
     38 #include <sys/device.h>
     39 #include <sys/tty.h>
     40 
     41 #ifdef KGDB
     42 #include <sys/kgdb.h>
     43 #endif
     44 
     45 #include <sys/bus.h>
     46 #include <machine/intr.h>
     47 #include <machine/iomod.h>
     48 #include <machine/autoconf.h>
     49 
     50 #include <dev/ic/comreg.h>
     51 #include <dev/ic/comvar.h>
     52 
     53 #include <hppa/dev/cpudevs.h>
     54 #include <hppa/gsc/gscbusvar.h>
     55 #include <hppa/hppa/machdep.h>
     56 
     57 #define	COMGSC_OFFSET	0x800
     58 #define	COMGSC_FREQUENCY (1843200 * 4) /* 16-bit baud rate divisor */
     59 
     60 struct com_gsc_regs {
     61 	uint8_t reset;
     62 };
     63 
     64 struct com_gsc_softc {
     65 	struct	com_softc sc_com;	/* real "com" softc */
     66 
     67 	/* GSC-specific goo. */
     68 	void	*sc_ih;			/* interrupt handler */
     69 };
     70 
     71 int	com_gsc_probe(device_t, cfdata_t , void *);
     72 void	com_gsc_attach(device_t, device_t, void *);
     73 
     74 CFATTACH_DECL_NEW(com_gsc, sizeof(struct com_gsc_softc),
     75     com_gsc_probe, com_gsc_attach, NULL, NULL);
     76 
     77 int
     78 com_gsc_probe(device_t parent, cfdata_t match, void *aux)
     79 {
     80 	struct gsc_attach_args *ga = aux;
     81 
     82 	if (ga->ga_type.iodc_type != HPPA_TYPE_FIO ||
     83 	    (ga->ga_type.iodc_sv_model != HPPA_FIO_GRS232 &&
     84 	     ga->ga_type.iodc_sv_model != HPPA_FIO_RS232))
     85 		return 0;
     86 
     87 	return 1;
     88 }
     89 
     90 void
     91 com_gsc_attach(device_t parent, device_t self, void *aux)
     92 {
     93 	struct com_gsc_softc *gsc = device_private(self);
     94 	struct com_softc *sc = &gsc->sc_com;
     95 	struct gsc_attach_args *ga = aux;
     96 	int pagezero_cookie;
     97 	bus_space_tag_t iot;
     98 	bus_space_handle_t ioh;
     99 	bus_addr_t iobase;
    100 
    101 	sc->sc_dev = self;
    102 	sc->sc_hwflags = 0;
    103 	sc->sc_swflags = 0;
    104 	iot = ga->ga_iot;
    105 	iobase = (bus_addr_t)ga->ga_hpa + COMGSC_OFFSET;
    106 	sc->sc_frequency = COMGSC_FREQUENCY;
    107 
    108 	/* Test if this is the console.  Compare either HPA or device path. */
    109 	pagezero_cookie = hppa_pagezero_map();
    110 	if ((hppa_hpa_t)PAGE0->mem_cons.pz_hpa == ga->ga_hpa ) {
    111 
    112 		/*
    113 		 * This port is the console.  In this case we must call
    114 		 * comcnattach() and later com_is_console() to initialize
    115 		 * everything properly.
    116 		 */
    117 
    118 		if (comcnattach(iot, iobase, B9600,
    119 			sc->sc_frequency, COM_TYPE_NORMAL,
    120 			(TTYDEF_CFLAG & ~(CSIZE | PARENB)) | CS8) != 0) {
    121 			aprint_error(": can't comcnattach\n");
    122 			hppa_pagezero_unmap(pagezero_cookie);
    123 			return;
    124 		}
    125 	}
    126 	hppa_pagezero_unmap(pagezero_cookie);
    127 
    128 	/*
    129 	 * Get the already initialized console ioh via com_is_console() if
    130 	 * this is the console or map the I/O space if this isn't the console.
    131 	 */
    132 
    133 	if (!com_is_console(iot, iobase, &ioh) &&
    134 	    bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh) != 0) {
    135 		aprint_error(": can't map I/O space\n");
    136 		return;
    137 	}
    138 	com_init_regs(&sc->sc_regs, iot, ioh, iobase);
    139 
    140 	com_attach_subr(sc);
    141 	gsc->sc_ih = hppa_intr_establish(IPL_TTY, comintr, sc, ga->ga_ir,
    142 	    ga->ga_irq);
    143 }
    144 
    145 #ifdef	KGDB
    146 int com_gsc_kgdb_attach(void);
    147 int
    148 com_gsc_kgdb_attach(void)
    149 {
    150 	int error;
    151 
    152 	printf("kgdb: attaching com at 0x%x at %d baud...",
    153 		KGDBADDR, KGDBRATE);
    154 	error = com_kgdb_attach(&hppa_bustag, KGDBADDR + COMGSC_OFFSET,
    155 				KGDBRATE, COMGSC_FREQUENCY, COM_TYPE_NORMAL,
    156 				((TTYDEF_CFLAG & ~(CSIZE | CSTOPB | PARENB)) |
    157 				 CS8));
    158 	if (error) {
    159 		printf(" failed (%d)\n", error);
    160 	} else {
    161 		printf(" ok\n");
    162 	}
    163 	return (error);
    164 }
    165 #endif	/* KGDB */
    166