1 /* $NetBSD: ast.c,v 1.32 1996/10/21 22:40:23 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 5 * Copyright (c) 1995 Charles Hannum. All rights reserved. 6 * 7 * This code is derived from public-domain software written by 8 * Roland McGrath. 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Charles Hannum. 21 * 4. The name of the author may not be used to endorse or promote products 22 * derived from this software without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/device.h> 39 #include <sys/termios.h> 40 41 #include <machine/bus.h> 42 #include <machine/intr.h> 43 44 #include <dev/isa/isavar.h> 45 #include <dev/isa/comreg.h> 46 #include <dev/isa/comvar.h> 47 48 #define NSLAVES 4 49 50 struct ast_softc { 51 struct device sc_dev; 52 void *sc_ih; 53 54 bus_space_tag_t sc_iot; 55 int sc_iobase; 56 57 int sc_alive; /* mask of slave units attached */ 58 void *sc_slaves[NSLAVES]; /* com device unit numbers */ 59 bus_space_handle_t sc_slaveioh[NSLAVES]; 60 }; 61 62 int astprobe __P((struct device *, void *, void *)); 63 void astattach __P((struct device *, struct device *, void *)); 64 int astintr __P((void *)); 65 int astprint __P((void *, const char *)); 66 67 struct cfattach ast_ca = { 68 sizeof(struct ast_softc), astprobe, astattach 69 }; 70 71 struct cfdriver ast_cd = { 72 NULL, "ast", DV_TTY 73 }; 74 75 int 76 astprobe(parent, self, aux) 77 struct device *parent; 78 void *self; 79 void *aux; 80 { 81 struct isa_attach_args *ia = aux; 82 int iobase = ia->ia_iobase; 83 bus_space_tag_t iot = ia->ia_iot; 84 bus_space_handle_t ioh; 85 int i, rv = 1; 86 87 /* 88 * Do the normal com probe for the first UART and assume 89 * its presence, and the ability to map the other UARTS, 90 * means there is a multiport board there. 91 * XXX Needs more robustness. 92 */ 93 94 /* if the first port is in use as console, then it. */ 95 if (iobase == comconsaddr && !comconsattached) 96 goto checkmappings; 97 98 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 99 rv = 0; 100 goto out; 101 } 102 rv = comprobe1(iot, ioh, iobase); 103 bus_space_unmap(iot, ioh, COM_NPORTS); 104 if (rv == 0) 105 goto out; 106 107 checkmappings: 108 for (i = 1; i < NSLAVES; i++) { 109 iobase += COM_NPORTS; 110 111 if (iobase == comconsaddr && !comconsattached) 112 continue; 113 114 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 115 rv = 0; 116 goto out; 117 } 118 bus_space_unmap(iot, ioh, COM_NPORTS); 119 } 120 121 out: 122 if (rv) 123 ia->ia_iosize = NSLAVES * COM_NPORTS; 124 return (rv); 125 } 126 127 int 128 astprint(aux, pnp) 129 void *aux; 130 const char *pnp; 131 { 132 struct commulti_attach_args *ca = aux; 133 134 if (pnp) 135 printf("com at %s", pnp); 136 printf(" slave %d", ca->ca_slave); 137 return (UNCONF); 138 } 139 140 void 141 astattach(parent, self, aux) 142 struct device *parent, *self; 143 void *aux; 144 { 145 struct ast_softc *sc = (void *)self; 146 struct isa_attach_args *ia = aux; 147 struct commulti_attach_args ca; 148 bus_space_tag_t iot = ia->ia_iot; 149 int i; 150 151 sc->sc_iot = ia->ia_iot; 152 sc->sc_iobase = ia->ia_iobase; 153 154 for (i = 0; i < NSLAVES; i++) 155 if (bus_space_map(iot, sc->sc_iobase + i * COM_NPORTS, 156 COM_NPORTS, 0, &sc->sc_slaveioh[i])) 157 panic("astattach: couldn't map slave %d", i); 158 159 /* 160 * Enable the master interrupt. 161 */ 162 bus_space_write_1(iot, sc->sc_slaveioh[3], 7, 0x80); 163 164 printf("\n"); 165 166 for (i = 0; i < NSLAVES; i++) { 167 ca.ca_slave = i; 168 ca.ca_iot = sc->sc_iot; 169 ca.ca_ioh = sc->sc_slaveioh[i]; 170 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS; 171 ca.ca_noien = 1; 172 173 sc->sc_slaves[i] = config_found(self, &ca, astprint); 174 if (sc->sc_slaves[i] != NULL) 175 sc->sc_alive |= 1 << i; 176 } 177 178 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE, 179 IPL_TTY, astintr, sc); 180 } 181 182 int 183 astintr(arg) 184 void *arg; 185 { 186 struct ast_softc *sc = arg; 187 bus_space_tag_t iot = sc->sc_iot; 188 int alive = sc->sc_alive; 189 int bits; 190 191 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive; 192 if (bits == 0) 193 return (0); 194 195 for (;;) { 196 #define TRY(n) \ 197 if (bits & (1 << (n))) \ 198 comintr(sc->sc_slaves[n]); 199 TRY(0); 200 TRY(1); 201 TRY(2); 202 TRY(3); 203 #undef TRY 204 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive; 205 if (bits == 0) 206 return (1); 207 } 208 } 209