sys/arch/hp700/gsc/com_gsc.c

   1 /*      $NetBSD: com_gsc.c,v 1.13 2009/05/24 06:53:35 skrll 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 1.13 2009/05/24 06:53:35 skrll 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 <machine/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 <hp700/dev/cpudevs.h>
  54 #include <hp700/gsc/gscbusvar.h>
  55 #include <hp700/hp700/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 = hp700_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                         hp700_pagezero_unmap(pagezero_cookie);
 123                         return;
 124                 }
 125         }
 126         hp700_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 = hp700_intr_establish(sc->sc_dev, IPL_TTY,
 142             comintr, sc, ga->ga_int_reg, 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 */