1 /* $NetBSD: ast.c,v 1.40 1997/10/19 18:56:46 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/ic/comreg.h> 45 #include <dev/ic/comvar.h> 46 47 #include <dev/isa/isavar.h> 48 #include <dev/isa/com_multi.h> 49 50 #define NSLAVES 4 51 52 struct ast_softc { 53 struct device sc_dev; 54 void *sc_ih; 55 56 bus_space_tag_t sc_iot; 57 int sc_iobase; 58 59 int sc_alive; /* mask of slave units attached */ 60 void *sc_slaves[NSLAVES]; /* com device unit numbers */ 61 bus_space_handle_t sc_slaveioh[NSLAVES]; 62 }; 63 64 #ifdef __BROKEN_INDIRECT_CONFIG 65 int astprobe __P((struct device *, void *, void *)); 66 #else 67 int astprobe __P((struct device *, struct cfdata *, void *)); 68 #endif 69 void astattach __P((struct device *, struct device *, void *)); 70 int astintr __P((void *)); 71 int astprint __P((void *, const char *)); 72 73 struct cfattach ast_ca = { 74 sizeof(struct ast_softc), astprobe, astattach 75 }; 76 77 struct cfdriver ast_cd = { 78 NULL, "ast", DV_TTY 79 }; 80 81 int 82 astprobe(parent, self, aux) 83 struct device *parent; 84 #ifdef __BROKEN_INDIRECT_CONFIG 85 void *self; 86 #else 87 struct cfdata *self; 88 #endif 89 void *aux; 90 { 91 struct isa_attach_args *ia = aux; 92 int iobase = ia->ia_iobase; 93 bus_space_tag_t iot = ia->ia_iot; 94 bus_space_handle_t ioh; 95 int i, rv = 1; 96 97 /* 98 * Do the normal com probe for the first UART and assume 99 * its presence, and the ability to map the other UARTS, 100 * means there is a multiport board there. 101 * XXX Needs more robustness. 102 */ 103 104 /* Disallow wildcarded i/o address. */ 105 if (ia->ia_iobase == ISACF_PORT_DEFAULT) 106 return (0); 107 108 /* if the first port is in use as console, then it. */ 109 if (com_is_console(iot, iobase, 0)) 110 goto checkmappings; 111 112 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 113 rv = 0; 114 goto out; 115 } 116 rv = comprobe1(iot, ioh, iobase); 117 bus_space_unmap(iot, ioh, COM_NPORTS); 118 if (rv == 0) 119 goto out; 120 121 checkmappings: 122 for (i = 1; i < NSLAVES; i++) { 123 iobase += COM_NPORTS; 124 125 if (com_is_console(iot, iobase, 0)) 126 continue; 127 128 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 129 rv = 0; 130 goto out; 131 } 132 bus_space_unmap(iot, ioh, COM_NPORTS); 133 } 134 135 out: 136 if (rv) 137 ia->ia_iosize = NSLAVES * COM_NPORTS; 138 return (rv); 139 } 140 141 int 142 astprint(aux, pnp) 143 void *aux; 144 const char *pnp; 145 { 146 struct commulti_attach_args *ca = aux; 147 148 if (pnp) 149 printf("com at %s", pnp); 150 printf(" slave %d", ca->ca_slave); 151 return (UNCONF); 152 } 153 154 void 155 astattach(parent, self, aux) 156 struct device *parent, *self; 157 void *aux; 158 { 159 struct ast_softc *sc = (void *)self; 160 struct isa_attach_args *ia = aux; 161 struct commulti_attach_args ca; 162 bus_space_tag_t iot = ia->ia_iot; 163 int i, iobase; 164 165 sc->sc_iot = ia->ia_iot; 166 sc->sc_iobase = ia->ia_iobase; 167 168 for (i = 0; i < NSLAVES; i++) { 169 iobase = sc->sc_iobase + i * COM_NPORTS; 170 if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) && 171 bus_space_map(iot, iobase, COM_NPORTS, 0, 172 &sc->sc_slaveioh[i])) 173 panic("astattach: couldn't map slave %d", i); 174 } 175 176 /* 177 * Enable the master interrupt. 178 */ 179 bus_space_write_1(iot, sc->sc_slaveioh[3], 7, 0x80); 180 181 printf("\n"); 182 183 for (i = 0; i < NSLAVES; i++) { 184 ca.ca_slave = i; 185 ca.ca_iot = sc->sc_iot; 186 ca.ca_ioh = sc->sc_slaveioh[i]; 187 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS; 188 ca.ca_noien = 1; 189 190 sc->sc_slaves[i] = config_found(self, &ca, astprint); 191 if (sc->sc_slaves[i] != NULL) 192 sc->sc_alive |= 1 << i; 193 } 194 195 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE, 196 IPL_SERIAL, astintr, sc); 197 } 198 199 int 200 astintr(arg) 201 void *arg; 202 { 203 struct ast_softc *sc = arg; 204 bus_space_tag_t iot = sc->sc_iot; 205 int alive = sc->sc_alive; 206 int bits; 207 208 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive; 209 if (bits == 0) 210 return (0); 211 212 for (;;) { 213 #define TRY(n) \ 214 if (bits & (1 << (n))) \ 215 comintr(sc->sc_slaves[n]); 216 TRY(0); 217 TRY(1); 218 TRY(2); 219 TRY(3); 220 #undef TRY 221 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 7) & alive; 222 if (bits == 0) 223 return (1); 224 } 225 } 226