1 /* $NetBSD: ast.c,v 1.33 1997/04/09 16:44:21 mycroft 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 #include <dev/isa/com_multi.h> 48 49 #define NSLAVES 4 50 51 struct ast_softc { 52 struct device sc_dev; 53 void *sc_ih; 54 55 bus_space_tag_t sc_iot; 56 int sc_iobase; 57 58 int sc_alive; /* mask of slave units attached */ 59 void *sc_slaves[NSLAVES]; /* com device unit numbers */ 60 bus_space_handle_t sc_slaveioh[NSLAVES]; 61 }; 62 63 int astprobe __P((struct device *, void *, void *)); 64 void astattach __P((struct device *, struct device *, void *)); 65 int astintr __P((void *)); 66 int astprint __P((void *, const char *)); 67 68 struct cfattach ast_ca = { 69 sizeof(struct ast_softc), astprobe, astattach 70 }; 71 72 struct cfdriver ast_cd = { 73 NULL, "ast", DV_TTY 74 }; 75 76 int 77 astprobe(parent, self, aux) 78 struct device *parent; 79 void *self; 80 void *aux; 81 { 82 struct isa_attach_args *ia = aux; 83 int iobase = ia->ia_iobase; 84 bus_space_tag_t iot = ia->ia_iot; 85 bus_space_handle_t ioh; 86 int i, rv = 1; 87 88 /* 89 * Do the normal com probe for the first UART and assume 90 * its presence, and the ability to map the other UARTS, 91 * means there is a multiport board there. 92 * XXX Needs more robustness. 93 */ 94 95 /* if the first port is in use as console, then it. */ 96 if (iobase == comconsaddr && !comconsattached) 97 goto checkmappings; 98 99 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 100 rv = 0; 101 goto out; 102 } 103 rv = comprobe1(iot, ioh, iobase); 104 bus_space_unmap(iot, ioh, COM_NPORTS); 105 if (rv == 0) 106 goto out; 107 108 checkmappings: 109 for (i = 1; i < NSLAVES; i++) { 110 iobase += COM_NPORTS; 111 112 if (iobase == comconsaddr && !comconsattached) 113 continue; 114 115 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 116 rv = 0; 117 goto out; 118 } 119 bus_space_unmap(iot, ioh, COM_NPORTS); 120 } 121 122 out: 123 if (rv) 124 ia->ia_iosize = NSLAVES * COM_NPORTS; 125 return (rv); 126 } 127 128 int 129 astprint(aux, pnp) 130 void *aux; 131 const char *pnp; 132 { 133 struct commulti_attach_args *ca = aux; 134 135 if (pnp) 136 printf("com at %s", pnp); 137 printf(" slave %d", ca->ca_slave); 138 return (UNCONF); 139 } 140 141 void 142 astattach(parent, self, aux) 143 struct device *parent, *self; 144 void *aux; 145 { 146 struct ast_softc *sc = (void *)self; 147 struct isa_attach_args *ia = aux; 148 struct commulti_attach_args ca; 149 bus_space_tag_t iot = ia->ia_iot; 150 int i; 151 152 sc->sc_iot = ia->ia_iot; 153 sc->sc_iobase = ia->ia_iobase; 154 155 for (i = 0; i < NSLAVES; i++) 156 if (bus_space_map(iot, sc->sc_iobase + i * COM_NPORTS, 157 COM_NPORTS, 0, &sc->sc_slaveioh[i])) 158 panic("astattach: couldn't map slave %d", i); 159 160 /* 161 * Enable the master interrupt. 162 */ 163 bus_space_write_1(iot, sc->sc_slaveioh[3], 7, 0x80); 164 165 printf("\n"); 166 167 for (i = 0; i < NSLAVES; i++) { 168 ca.ca_slave = i; 169 ca.ca_iot = sc->sc_iot; 170 ca.ca_ioh = sc->sc_slaveioh[i]; 171 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS; 172 ca.ca_noien = 1; 173 174 sc->sc_slaves[i] = config_found(self, &ca, astprint); 175 if (sc->sc_slaves[i] != NULL) 176 sc->sc_alive |= 1 << i; 177 } 178 179 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE, 180 IPL_SERIAL, astintr, sc); 181 } 182 183 int 184 astintr(arg) 185 void *arg; 186 { 187 struct ast_softc *sc = arg; 188 bus_space_tag_t iot = sc->sc_iot; 189 int alive = sc->sc_alive; 190 int bits; 191 192 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive; 193 if (bits == 0) 194 return (0); 195 196 for (;;) { 197 #define TRY(n) \ 198 if (bits & (1 << (n))) \ 199 comintr(sc->sc_slaves[n]); 200 TRY(0); 201 TRY(1); 202 TRY(2); 203 TRY(3); 204 #undef TRY 205 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive; 206 if (bits == 0) 207 return (1); 208 } 209 } 210