1 /* $NetBSD: ast.c,v 1.47 2001/11/13 08:01:10 lukem 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/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: ast.c,v 1.47 2001/11/13 08:01:10 lukem Exp $"); 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/device.h> 42 #include <sys/termios.h> 43 44 #include <machine/bus.h> 45 #include <machine/intr.h> 46 47 #include <dev/ic/comreg.h> 48 #include <dev/ic/comvar.h> 49 50 #include <dev/isa/isavar.h> 51 #include <dev/isa/com_multi.h> 52 53 #define NSLAVES 4 54 55 struct ast_softc { 56 struct device sc_dev; 57 void *sc_ih; 58 59 bus_space_tag_t sc_iot; 60 int sc_iobase; 61 62 int sc_alive; /* mask of slave units attached */ 63 void *sc_slaves[NSLAVES]; /* com device unit numbers */ 64 bus_space_handle_t sc_slaveioh[NSLAVES]; 65 }; 66 67 int astprobe __P((struct device *, struct cfdata *, void *)); 68 void astattach __P((struct device *, struct device *, void *)); 69 int astintr __P((void *)); 70 int astprint __P((void *, const char *)); 71 72 struct cfattach ast_ca = { 73 sizeof(struct ast_softc), astprobe, astattach 74 }; 75 76 int 77 astprobe(parent, self, aux) 78 struct device *parent; 79 struct cfdata *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 /* Disallow wildcarded i/o address. */ 96 if (ia->ia_iobase == ISACF_PORT_DEFAULT) 97 return (0); 98 99 /* if the first port is in use as console, then it. */ 100 if (com_is_console(iot, iobase, 0)) 101 goto checkmappings; 102 103 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 104 rv = 0; 105 goto out; 106 } 107 rv = comprobe1(iot, ioh); 108 bus_space_unmap(iot, ioh, COM_NPORTS); 109 if (rv == 0) 110 goto out; 111 112 checkmappings: 113 for (i = 1; i < NSLAVES; i++) { 114 iobase += COM_NPORTS; 115 116 if (com_is_console(iot, iobase, 0)) 117 continue; 118 119 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 120 rv = 0; 121 goto out; 122 } 123 bus_space_unmap(iot, ioh, COM_NPORTS); 124 } 125 126 out: 127 if (rv) 128 ia->ia_iosize = NSLAVES * COM_NPORTS; 129 return (rv); 130 } 131 132 int 133 astprint(aux, pnp) 134 void *aux; 135 const char *pnp; 136 { 137 struct commulti_attach_args *ca = aux; 138 139 if (pnp) 140 printf("com at %s", pnp); 141 printf(" slave %d", ca->ca_slave); 142 return (UNCONF); 143 } 144 145 void 146 astattach(parent, self, aux) 147 struct device *parent, *self; 148 void *aux; 149 { 150 struct ast_softc *sc = (void *)self; 151 struct isa_attach_args *ia = aux; 152 struct commulti_attach_args ca; 153 bus_space_tag_t iot = ia->ia_iot; 154 int i, iobase; 155 156 printf("\n"); 157 158 sc->sc_iot = ia->ia_iot; 159 sc->sc_iobase = ia->ia_iobase; 160 161 for (i = 0; i < NSLAVES; i++) { 162 iobase = sc->sc_iobase + i * COM_NPORTS; 163 if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) && 164 bus_space_map(iot, iobase, COM_NPORTS, 0, 165 &sc->sc_slaveioh[i])) { 166 printf("%s: can't map i/o space for slave %d\n", 167 sc->sc_dev.dv_xname, i); 168 return; 169 } 170 } 171 172 /* 173 * Enable the master interrupt. 174 */ 175 bus_space_write_1(iot, sc->sc_slaveioh[3], com_scratch, 0x80); 176 177 for (i = 0; i < NSLAVES; i++) { 178 ca.ca_slave = i; 179 ca.ca_iot = sc->sc_iot; 180 ca.ca_ioh = sc->sc_slaveioh[i]; 181 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS; 182 ca.ca_noien = 1; 183 184 sc->sc_slaves[i] = config_found(self, &ca, astprint); 185 if (sc->sc_slaves[i] != NULL) 186 sc->sc_alive |= 1 << i; 187 } 188 189 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq, IST_EDGE, 190 IPL_SERIAL, astintr, sc); 191 } 192 193 int 194 astintr(arg) 195 void *arg; 196 { 197 struct ast_softc *sc = arg; 198 bus_space_tag_t iot = sc->sc_iot; 199 int alive = sc->sc_alive; 200 int bits; 201 202 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], com_scratch) & alive; 203 if (bits == 0) 204 return (0); 205 206 for (;;) { 207 #define TRY(n) \ 208 if (bits & (1 << (n))) \ 209 comintr(sc->sc_slaves[n]); 210 TRY(0); 211 TRY(1); 212 TRY(2); 213 TRY(3); 214 #undef TRY 215 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 216 com_scratch) & alive; 217 if (bits == 0) 218 return (1); 219 } 220 } 221