1 /* $NetBSD: ast.c,v 1.48 2002/01/07 21:47:04 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/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: ast.c,v 1.48 2002/01/07 21:47:04 thorpej 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 bus_space_tag_t iot = ia->ia_iot; 84 bus_space_handle_t ioh; 85 int i, iobase, 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 (ia->ia_nio < 1) 95 return (0); 96 if (ia->ia_nirq < 1) 97 return (0); 98 99 if (ISA_DIRECT_CONFIG(ia)) 100 return (0); 101 102 /* Disallow wildcarded i/o address. */ 103 if (ia->ia_io[0].ir_addr == ISACF_PORT_DEFAULT) 104 return (0); 105 106 if (ia->ia_irq[0].ir_irq == ISACF_IRQ_DEFAULT) 107 return (0); 108 109 /* if the first port is in use as console, then it. */ 110 if (com_is_console(iot, ia->ia_io[0].ir_addr, 0)) 111 goto checkmappings; 112 113 if (bus_space_map(iot, ia->ia_io[0].ir_addr, COM_NPORTS, 0, &ioh)) { 114 rv = 0; 115 goto out; 116 } 117 rv = comprobe1(iot, ioh); 118 bus_space_unmap(iot, ioh, COM_NPORTS); 119 if (rv == 0) 120 goto out; 121 122 checkmappings: 123 for (i = 1, iobase = ia->ia_io[0].ir_addr; i < NSLAVES; i++) { 124 iobase += COM_NPORTS; 125 126 if (com_is_console(iot, iobase, 0)) 127 continue; 128 129 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 130 rv = 0; 131 goto out; 132 } 133 bus_space_unmap(iot, ioh, COM_NPORTS); 134 } 135 136 out: 137 if (rv) { 138 ia->ia_nio = 1; 139 ia->ia_io[0].ir_size = NSLAVES * COM_NPORTS; 140 141 ia->ia_nirq = 1; 142 143 ia->ia_niomem = 0; 144 ia->ia_ndrq = 0; 145 } 146 return (rv); 147 } 148 149 int 150 astprint(aux, pnp) 151 void *aux; 152 const char *pnp; 153 { 154 struct commulti_attach_args *ca = aux; 155 156 if (pnp) 157 printf("com at %s", pnp); 158 printf(" slave %d", ca->ca_slave); 159 return (UNCONF); 160 } 161 162 void 163 astattach(parent, self, aux) 164 struct device *parent, *self; 165 void *aux; 166 { 167 struct ast_softc *sc = (void *)self; 168 struct isa_attach_args *ia = aux; 169 struct commulti_attach_args ca; 170 bus_space_tag_t iot = ia->ia_iot; 171 int i, iobase; 172 173 printf("\n"); 174 175 sc->sc_iot = ia->ia_iot; 176 sc->sc_iobase = ia->ia_io[0].ir_addr; 177 178 for (i = 0; i < NSLAVES; i++) { 179 iobase = sc->sc_iobase + i * COM_NPORTS; 180 if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) && 181 bus_space_map(iot, iobase, COM_NPORTS, 0, 182 &sc->sc_slaveioh[i])) { 183 printf("%s: can't map i/o space for slave %d\n", 184 sc->sc_dev.dv_xname, i); 185 return; 186 } 187 } 188 189 /* 190 * Enable the master interrupt. 191 */ 192 bus_space_write_1(iot, sc->sc_slaveioh[3], com_scratch, 0x80); 193 194 for (i = 0; i < NSLAVES; i++) { 195 ca.ca_slave = i; 196 ca.ca_iot = sc->sc_iot; 197 ca.ca_ioh = sc->sc_slaveioh[i]; 198 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS; 199 ca.ca_noien = 1; 200 201 sc->sc_slaves[i] = config_found(self, &ca, astprint); 202 if (sc->sc_slaves[i] != NULL) 203 sc->sc_alive |= 1 << i; 204 } 205 206 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq, 207 IST_EDGE, IPL_SERIAL, astintr, sc); 208 } 209 210 int 211 astintr(arg) 212 void *arg; 213 { 214 struct ast_softc *sc = arg; 215 bus_space_tag_t iot = sc->sc_iot; 216 int alive = sc->sc_alive; 217 int bits; 218 219 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], com_scratch) & alive; 220 if (bits == 0) 221 return (0); 222 223 for (;;) { 224 #define TRY(n) \ 225 if (bits & (1 << (n))) \ 226 comintr(sc->sc_slaves[n]); 227 TRY(0); 228 TRY(1); 229 TRY(2); 230 TRY(3); 231 #undef TRY 232 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 233 com_scratch) & alive; 234 if (bits == 0) 235 return (1); 236 } 237 } 238