1 /* $NetBSD: ast.c,v 1.52 2003/01/01 00:10:20 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 1.52 2003/01/01 00:10:20 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 CFATTACH_DECL(ast, sizeof(struct ast_softc), 73 astprobe, astattach, NULL, NULL); 74 75 int 76 astprobe(parent, self, aux) 77 struct device *parent; 78 struct cfdata *self; 79 void *aux; 80 { 81 struct isa_attach_args *ia = aux; 82 bus_space_tag_t iot = ia->ia_iot; 83 bus_space_handle_t ioh; 84 int i, iobase, rv = 1; 85 86 /* 87 * Do the normal com probe for the first UART and assume 88 * its presence, and the ability to map the other UARTS, 89 * means there is a multiport board there. 90 * XXX Needs more robustness. 91 */ 92 93 if (ia->ia_nio < 1) 94 return (0); 95 if (ia->ia_nirq < 1) 96 return (0); 97 98 if (ISA_DIRECT_CONFIG(ia)) 99 return (0); 100 101 /* Disallow wildcarded i/o address. */ 102 if (ia->ia_io[0].ir_addr == ISACF_PORT_DEFAULT) 103 return (0); 104 105 if (ia->ia_irq[0].ir_irq == ISACF_IRQ_DEFAULT) 106 return (0); 107 108 /* if the first port is in use as console, then it. */ 109 if (com_is_console(iot, ia->ia_io[0].ir_addr, 0)) 110 goto checkmappings; 111 112 if (bus_space_map(iot, ia->ia_io[0].ir_addr, COM_NPORTS, 0, &ioh)) { 113 rv = 0; 114 goto out; 115 } 116 rv = comprobe1(iot, ioh); 117 bus_space_unmap(iot, ioh, COM_NPORTS); 118 if (rv == 0) 119 goto out; 120 121 checkmappings: 122 for (i = 1, iobase = ia->ia_io[0].ir_addr; 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_nio = 1; 138 ia->ia_io[0].ir_size = NSLAVES * COM_NPORTS; 139 140 ia->ia_nirq = 1; 141 142 ia->ia_niomem = 0; 143 ia->ia_ndrq = 0; 144 } 145 return (rv); 146 } 147 148 int 149 astprint(aux, pnp) 150 void *aux; 151 const char *pnp; 152 { 153 struct commulti_attach_args *ca = aux; 154 155 if (pnp) 156 aprint_normal("com at %s", pnp); 157 aprint_normal(" slave %d", ca->ca_slave); 158 return (UNCONF); 159 } 160 161 void 162 astattach(parent, self, aux) 163 struct device *parent, *self; 164 void *aux; 165 { 166 struct ast_softc *sc = (void *)self; 167 struct isa_attach_args *ia = aux; 168 struct commulti_attach_args ca; 169 bus_space_tag_t iot = ia->ia_iot; 170 int i, iobase; 171 172 printf("\n"); 173 174 sc->sc_iot = ia->ia_iot; 175 sc->sc_iobase = ia->ia_io[0].ir_addr; 176 177 for (i = 0; i < NSLAVES; i++) { 178 iobase = sc->sc_iobase + i * COM_NPORTS; 179 if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) && 180 bus_space_map(iot, iobase, COM_NPORTS, 0, 181 &sc->sc_slaveioh[i])) { 182 printf("%s: can't map i/o space for slave %d\n", 183 sc->sc_dev.dv_xname, i); 184 return; 185 } 186 } 187 188 /* 189 * Enable the master interrupt. 190 */ 191 bus_space_write_1(iot, sc->sc_slaveioh[3], com_scratch, 0x80); 192 193 for (i = 0; i < NSLAVES; i++) { 194 ca.ca_slave = i; 195 ca.ca_iot = sc->sc_iot; 196 ca.ca_ioh = sc->sc_slaveioh[i]; 197 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS; 198 ca.ca_noien = 1; 199 200 sc->sc_slaves[i] = config_found(self, &ca, astprint); 201 if (sc->sc_slaves[i] != NULL) 202 sc->sc_alive |= 1 << i; 203 } 204 205 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq, 206 IST_EDGE, IPL_SERIAL, astintr, sc); 207 } 208 209 int 210 astintr(arg) 211 void *arg; 212 { 213 struct ast_softc *sc = arg; 214 bus_space_tag_t iot = sc->sc_iot; 215 int alive = sc->sc_alive; 216 int bits; 217 218 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], com_scratch) & alive; 219 if (bits == 0) 220 return (0); 221 222 for (;;) { 223 #define TRY(n) \ 224 if (bits & (1 << (n))) \ 225 comintr(sc->sc_slaves[n]); 226 TRY(0); 227 TRY(1); 228 TRY(2); 229 TRY(3); 230 #undef TRY 231 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 232 com_scratch) & alive; 233 if (bits == 0) 234 return (1); 235 } 236 } 237