1 /* $NetBSD: ast.c,v 1.46 2000/05/20 18:25:41 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1996 Christopher G. Demetriou. All rights reserved. 5 * Copyright (c) 1995 Charles M. 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 M. 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 int astprobe __P((struct device *, struct cfdata *, void *)); 65 void astattach __P((struct device *, struct device *, void *)); 66 int astintr __P((void *)); 67 int astprint __P((void *, const char *)); 68 69 struct cfattach ast_ca = { 70 sizeof(struct ast_softc), astprobe, astattach 71 }; 72 73 int 74 astprobe(parent, self, aux) 75 struct device *parent; 76 struct cfdata *self; 77 void *aux; 78 { 79 struct isa_attach_args *ia = aux; 80 int iobase = ia->ia_iobase; 81 bus_space_tag_t iot = ia->ia_iot; 82 bus_space_handle_t ioh; 83 int i, rv = 1; 84 85 /* 86 * Do the normal com probe for the first UART and assume 87 * its presence, and the ability to map the other UARTS, 88 * means there is a multiport board there. 89 * XXX Needs more robustness. 90 */ 91 92 /* Disallow wildcarded i/o address. */ 93 if (ia->ia_iobase == ISACF_PORT_DEFAULT) 94 return (0); 95 96 /* if the first port is in use as console, then it. */ 97 if (com_is_console(iot, iobase, 0)) 98 goto checkmappings; 99 100 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 101 rv = 0; 102 goto out; 103 } 104 rv = comprobe1(iot, ioh); 105 bus_space_unmap(iot, ioh, COM_NPORTS); 106 if (rv == 0) 107 goto out; 108 109 checkmappings: 110 for (i = 1; i < NSLAVES; i++) { 111 iobase += COM_NPORTS; 112 113 if (com_is_console(iot, iobase, 0)) 114 continue; 115 116 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 117 rv = 0; 118 goto out; 119 } 120 bus_space_unmap(iot, ioh, COM_NPORTS); 121 } 122 123 out: 124 if (rv) 125 ia->ia_iosize = NSLAVES * COM_NPORTS; 126 return (rv); 127 } 128 129 int 130 astprint(aux, pnp) 131 void *aux; 132 const char *pnp; 133 { 134 struct commulti_attach_args *ca = aux; 135 136 if (pnp) 137 printf("com at %s", pnp); 138 printf(" slave %d", ca->ca_slave); 139 return (UNCONF); 140 } 141 142 void 143 astattach(parent, self, aux) 144 struct device *parent, *self; 145 void *aux; 146 { 147 struct ast_softc *sc = (void *)self; 148 struct isa_attach_args *ia = aux; 149 struct commulti_attach_args ca; 150 bus_space_tag_t iot = ia->ia_iot; 151 int i, iobase; 152 153 printf("\n"); 154 155 sc->sc_iot = ia->ia_iot; 156 sc->sc_iobase = ia->ia_iobase; 157 158 for (i = 0; i < NSLAVES; i++) { 159 iobase = sc->sc_iobase + i * COM_NPORTS; 160 if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) && 161 bus_space_map(iot, iobase, COM_NPORTS, 0, 162 &sc->sc_slaveioh[i])) { 163 printf("%s: can't map i/o space for slave %d\n", 164 sc->sc_dev.dv_xname, i); 165 return; 166 } 167 } 168 169 /* 170 * Enable the master interrupt. 171 */ 172 bus_space_write_1(iot, sc->sc_slaveioh[3], com_scratch, 0x80); 173 174 for (i = 0; i < NSLAVES; i++) { 175 ca.ca_slave = i; 176 ca.ca_iot = sc->sc_iot; 177 ca.ca_ioh = sc->sc_slaveioh[i]; 178 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS; 179 ca.ca_noien = 1; 180 181 sc->sc_slaves[i] = config_found(self, &ca, astprint); 182 if (sc->sc_slaves[i] != NULL) 183 sc->sc_alive |= 1 << i; 184 } 185 186 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE, 187 IPL_SERIAL, astintr, sc); 188 } 189 190 int 191 astintr(arg) 192 void *arg; 193 { 194 struct ast_softc *sc = arg; 195 bus_space_tag_t iot = sc->sc_iot; 196 int alive = sc->sc_alive; 197 int bits; 198 199 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], com_scratch) & alive; 200 if (bits == 0) 201 return (0); 202 203 for (;;) { 204 #define TRY(n) \ 205 if (bits & (1 << (n))) \ 206 comintr(sc->sc_slaves[n]); 207 TRY(0); 208 TRY(1); 209 TRY(2); 210 TRY(3); 211 #undef TRY 212 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 213 com_scratch) & alive; 214 if (bits == 0) 215 return (1); 216 } 217 } 218