1 /* $NetBSD: ast.c,v 1.61 2008/05/30 10:59:42 martin 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 1.61 2008/05/30 10:59:42 martin 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 <sys/bus.h> 45 #include <sys/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 softc pointers */ 64 bus_space_handle_t sc_slaveioh[NSLAVES]; 65 }; 66 67 int astprobe(struct device *, struct cfdata *, void *); 68 void astattach(struct device *, struct device *, void *); 69 int astintr(void *); 70 71 CFATTACH_DECL(ast, sizeof(struct ast_softc), 72 astprobe, astattach, NULL, NULL); 73 74 int 75 astprobe(struct device *parent, struct cfdata *self, 76 void *aux) 77 { 78 struct isa_attach_args *ia = aux; 79 bus_space_tag_t iot = ia->ia_iot; 80 bus_space_handle_t ioh; 81 int i, iobase, rv = 1; 82 83 /* 84 * Do the normal com probe for the first UART and assume 85 * its presence, and the ability to map the other UARTS, 86 * means there is a multiport board there. 87 * XXX Needs more robustness. 88 */ 89 90 if (ia->ia_nio < 1) 91 return (0); 92 if (ia->ia_nirq < 1) 93 return (0); 94 95 if (ISA_DIRECT_CONFIG(ia)) 96 return (0); 97 98 /* Disallow wildcarded i/o address. */ 99 if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT) 100 return (0); 101 102 if (ia->ia_irq[0].ir_irq == ISA_UNKNOWN_IRQ) 103 return (0); 104 105 /* if the first port is in use as console, then it. */ 106 if (com_is_console(iot, ia->ia_io[0].ir_addr, 0)) 107 goto checkmappings; 108 109 if (bus_space_map(iot, ia->ia_io[0].ir_addr, COM_NPORTS, 0, &ioh)) { 110 rv = 0; 111 goto out; 112 } 113 rv = comprobe1(iot, ioh); 114 bus_space_unmap(iot, ioh, COM_NPORTS); 115 if (rv == 0) 116 goto out; 117 118 checkmappings: 119 for (i = 1, iobase = ia->ia_io[0].ir_addr; i < NSLAVES; i++) { 120 iobase += COM_NPORTS; 121 122 if (com_is_console(iot, iobase, 0)) 123 continue; 124 125 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 126 rv = 0; 127 goto out; 128 } 129 bus_space_unmap(iot, ioh, COM_NPORTS); 130 } 131 132 out: 133 if (rv) { 134 ia->ia_nio = 1; 135 ia->ia_io[0].ir_size = NSLAVES * COM_NPORTS; 136 137 ia->ia_nirq = 1; 138 139 ia->ia_niomem = 0; 140 ia->ia_ndrq = 0; 141 } 142 return (rv); 143 } 144 145 void 146 astattach(struct device *parent, struct device *self, void *aux) 147 { 148 struct ast_softc *sc = device_private(self); 149 struct isa_attach_args *ia = aux; 150 struct commulti_attach_args ca; 151 bus_space_tag_t iot = ia->ia_iot; 152 int i, iobase; 153 device_t slave; 154 155 printf("\n"); 156 157 sc->sc_iot = ia->ia_iot; 158 sc->sc_iobase = ia->ia_io[0].ir_addr; 159 160 for (i = 0; i < NSLAVES; i++) { 161 iobase = sc->sc_iobase + i * COM_NPORTS; 162 if (!com_is_console(iot, iobase, &sc->sc_slaveioh[i]) && 163 bus_space_map(iot, iobase, COM_NPORTS, 0, 164 &sc->sc_slaveioh[i])) { 165 aprint_error_dev(&sc->sc_dev, "can't map i/o space for slave %d\n", i); 166 return; 167 } 168 } 169 170 /* 171 * Enable the master interrupt. 172 */ 173 bus_space_write_1(iot, sc->sc_slaveioh[3], com_scratch, 0x80); 174 175 for (i = 0; i < NSLAVES; i++) { 176 ca.ca_slave = i; 177 ca.ca_iot = sc->sc_iot; 178 ca.ca_ioh = sc->sc_slaveioh[i]; 179 ca.ca_iobase = sc->sc_iobase + i * COM_NPORTS; 180 ca.ca_noien = 1; 181 182 slave = config_found(self, &ca, commultiprint); 183 if (slave != NULL) { 184 sc->sc_alive |= 1 << i; 185 sc->sc_slaves[i] = device_private(slave); 186 } 187 } 188 189 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq, 190 IST_EDGE, 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