1/* $NetBSD: ast.c,v 1.68 2021/08/07 16:19:12 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 1.68 2021/08/07 16:19:12 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 <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 55struct ast_softc { 56 void *sc_ih; 57 58 bus_space_tag_t sc_iot; 59 int sc_iobase; 60 61 int sc_alive; /* mask of slave units attached */ 62 void *sc_slaves[NSLAVES]; /* com device softc pointers */ 63 bus_space_handle_t sc_slaveioh[NSLAVES]; 64}; 65 66int astprobe(device_t, cfdata_t, void *); 67void astattach(device_t, device_t, void *); 68int astintr(void *); 69 70CFATTACH_DECL_NEW(ast, sizeof(struct ast_softc), 71 astprobe, astattach, NULL, NULL); 72 73int 74astprobe(device_t parent, cfdata_t self, void *aux) 75{ 76 struct isa_attach_args *ia = aux; 77 bus_space_tag_t iot = ia->ia_iot; 78 bus_space_handle_t ioh; 79 int i, iobase, rv = 1; 80 81 /* 82 * Do the normal com probe for the first UART and assume 83 * its presence, and the ability to map the other UARTS, 84 * means there is a multiport board there. 85 * XXX Needs more robustness. 86 */ 87 88 if (ia->ia_nio < 1) 89 return (0); 90 if (ia->ia_nirq < 1) 91 return (0); 92 93 if (ISA_DIRECT_CONFIG(ia)) 94 return (0); 95 96 /* Disallow wildcarded i/o address. */ 97 if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT) 98 return (0); 99 100 if (ia->ia_irq[0].ir_irq == ISA_UNKNOWN_IRQ) 101 return (0); 102 103 /* if the first port is in use as console, then it. */ 104 if (com_is_console(iot, ia->ia_io[0].ir_addr, 0)) 105 goto checkmappings; 106 107 if (bus_space_map(iot, ia->ia_io[0].ir_addr, COM_NPORTS, 0, &ioh)) { 108 rv = 0; 109 goto out; 110 } 111 rv = comprobe1(iot, ioh); 112 bus_space_unmap(iot, ioh, COM_NPORTS); 113 if (rv == 0) 114 goto out; 115 116checkmappings: 117 for (i = 1, iobase = ia->ia_io[0].ir_addr; i < NSLAVES; i++) { 118 iobase += COM_NPORTS; 119 120 if (com_is_console(iot, iobase, 0)) 121 continue; 122 123 if (bus_space_map(iot, iobase, COM_NPORTS, 0, &ioh)) { 124 rv = 0; 125 goto out; 126 } 127 bus_space_unmap(iot, ioh, COM_NPORTS); 128 } 129 130out: 131 if (rv) { 132 ia->ia_nio = 1; 133 ia->ia_io[0].ir_size = NSLAVES * COM_NPORTS; 134 135 ia->ia_nirq = 1; 136 137 ia->ia_niomem = 0; 138 ia->ia_ndrq = 0; 139 } 140 return (rv); 141} 142 143void 144astattach(device_t parent, device_t self, void *aux) 145{ 146 struct ast_softc *sc = device_private(self); 147 struct isa_attach_args *ia = aux; 148 struct commulti_attach_args ca; 149 bus_space_tag_t iot = ia->ia_iot; 150 int i, iobase; 151 device_t slave; 152 153 printf("\n"); 154 155 sc->sc_iot = ia->ia_iot; 156 sc->sc_iobase = ia->ia_io[0].ir_addr; 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 aprint_error_dev(self, 164 "can't map i/o space for slave %d\n", 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 slave = config_found(self, &ca, commultiprint, CFARGS_NONE); 182 if (slave != NULL) { 183 sc->sc_alive |= 1 << i; 184 sc->sc_slaves[i] = device_private(slave); 185 } 186 } 187 188 sc->sc_ih = isa_intr_establish(ia->ia_ic, ia->ia_irq[0].ir_irq, 189 IST_EDGE, IPL_SERIAL, astintr, sc); 190} 191 192int 193astintr(void *arg) 194{ 195 struct ast_softc *sc = arg; 196 bus_space_tag_t iot = sc->sc_iot; 197 int alive = sc->sc_alive; 198 int bits; 199 200 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], com_scratch) & alive; 201 if (bits == 0) 202 return (0); 203 204 for (;;) { 205#define TRY(n) \ 206 if (bits & (1 << (n))) \ 207 comintr(sc->sc_slaves[n]); 208 TRY(0); 209 TRY(1); 210 TRY(2); 211 TRY(3); 212#undef TRY 213 bits = ~bus_space_read_1(iot, sc->sc_slaveioh[3], 214 com_scratch) & alive; 215 if (bits == 0) 216 return (1); 217 } 218} 219