1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1997-2000 Nicolas Souchu 5 * Copyright (c) 2001 Alcove - Nicolas Souchu 6 * Copyright (c) 2006 Marcel Moolenaar 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/lock.h> 38 #include <sys/module.h> 39 #include <sys/mutex.h> 40 #include <sys/bus.h> 41 #include <machine/bus.h> 42 #include <sys/malloc.h> 43 #include <sys/rman.h> 44 45 #include <isa/isavar.h> 46 47 #include <dev/ppbus/ppbconf.h> 48 #include <dev/ppbus/ppb_msq.h> 49 #include <dev/ppc/ppcvar.h> 50 #include <dev/ppc/ppcreg.h> 51 52 #include "ppbus_if.h" 53 54 static int ppc_isa_probe(device_t dev); 55 56 int ppc_isa_attach(device_t dev); 57 int ppc_isa_write(device_t, char *, int, int); 58 59 static device_method_t ppc_isa_methods[] = { 60 /* device interface */ 61 DEVMETHOD(device_probe, ppc_isa_probe), 62 DEVMETHOD(device_attach, ppc_isa_attach), 63 DEVMETHOD(device_detach, ppc_detach), 64 65 /* bus interface */ 66 DEVMETHOD(bus_read_ivar, ppc_read_ivar), 67 DEVMETHOD(bus_write_ivar, ppc_write_ivar), 68 DEVMETHOD(bus_alloc_resource, ppc_alloc_resource), 69 DEVMETHOD(bus_release_resource, ppc_release_resource), 70 71 /* ppbus interface */ 72 DEVMETHOD(ppbus_io, ppc_io), 73 DEVMETHOD(ppbus_exec_microseq, ppc_exec_microseq), 74 DEVMETHOD(ppbus_reset_epp, ppc_reset_epp), 75 DEVMETHOD(ppbus_setmode, ppc_setmode), 76 DEVMETHOD(ppbus_ecp_sync, ppc_ecp_sync), 77 DEVMETHOD(ppbus_read, ppc_read), 78 DEVMETHOD(ppbus_write, ppc_isa_write), 79 80 { 0, 0 } 81 }; 82 83 static driver_t ppc_isa_driver = { 84 ppc_driver_name, 85 ppc_isa_methods, 86 sizeof(struct ppc_data), 87 }; 88 89 static struct isa_pnp_id lpc_ids[] = { 90 { 0x0004d041, "Standard parallel printer port" }, /* PNP0400 */ 91 { 0x0104d041, "ECP parallel printer port" }, /* PNP0401 */ 92 { 0 } 93 }; 94 95 static void 96 ppc_isa_dmadone(struct ppc_data *ppc) 97 { 98 isa_dmadone(ppc->ppc_dmaflags, ppc->ppc_dmaddr, ppc->ppc_dmacnt, 99 ppc->ppc_dmachan); 100 } 101 102 int 103 ppc_isa_attach(device_t dev) 104 { 105 struct ppc_data *ppc = device_get_softc(dev); 106 107 if ((ppc->ppc_avm & PPB_ECP) && (ppc->ppc_dmachan > 0)) { 108 /* acquire the DMA channel forever */ /* XXX */ 109 isa_dma_acquire(ppc->ppc_dmachan); 110 isa_dmainit(ppc->ppc_dmachan, 1024); /* nlpt.BUFSIZE */ 111 ppc->ppc_dmadone = ppc_isa_dmadone; 112 } 113 114 return (ppc_attach(dev)); 115 } 116 117 static int 118 ppc_isa_probe(device_t dev) 119 { 120 device_t parent; 121 int error; 122 123 parent = device_get_parent(dev); 124 125 error = ISA_PNP_PROBE(parent, dev, lpc_ids); 126 if (error == ENXIO) 127 return (ENXIO); 128 if (error != 0) /* XXX shall be set after detection */ 129 device_set_desc(dev, "Parallel port"); 130 131 return (ppc_probe(dev, 0)); 132 } 133 134 /* 135 * Call this function if you want to send data in any advanced mode 136 * of your parallel port: FIFO, DMA 137 * 138 * If what you want is not possible (no ECP, no DMA...), 139 * EINVAL is returned 140 */ 141 int 142 ppc_isa_write(device_t dev, char *buf, int len, int how) 143 { 144 struct ppc_data *ppc = device_get_softc(dev); 145 char ecr, ecr_sav, ctr, ctr_sav; 146 int error = 0; 147 int spin; 148 149 PPC_ASSERT_LOCKED(ppc); 150 if (!(ppc->ppc_avm & PPB_ECP)) 151 return (EINVAL); 152 if (ppc->ppc_dmachan == 0) 153 return (EINVAL); 154 155 #ifdef PPC_DEBUG 156 printf("w"); 157 #endif 158 159 ecr_sav = r_ecr(ppc); 160 ctr_sav = r_ctr(ppc); 161 162 /* 163 * Send buffer with DMA, FIFO and interrupts 164 */ 165 166 /* byte mode, no intr, no DMA, dir=0, flush fifo */ 167 ecr = PPC_ECR_STD | PPC_DISABLE_INTR; 168 w_ecr(ppc, ecr); 169 170 /* disable nAck interrupts */ 171 ctr = r_ctr(ppc); 172 ctr &= ~IRQENABLE; 173 w_ctr(ppc, ctr); 174 175 ppc->ppc_dmaflags = 0; 176 ppc->ppc_dmaddr = (caddr_t)buf; 177 ppc->ppc_dmacnt = (u_int)len; 178 179 switch (ppc->ppc_mode) { 180 case PPB_COMPATIBLE: 181 /* compatible mode with FIFO, no intr, DMA, dir=0 */ 182 ecr = PPC_ECR_FIFO | PPC_DISABLE_INTR | PPC_ENABLE_DMA; 183 break; 184 case PPB_ECP: 185 ecr = PPC_ECR_ECP | PPC_DISABLE_INTR | PPC_ENABLE_DMA; 186 break; 187 default: 188 error = EINVAL; 189 goto error; 190 } 191 192 w_ecr(ppc, ecr); 193 ecr = r_ecr(ppc); 194 195 ppc->ppc_dmastat = PPC_DMA_INIT; 196 197 /* enable interrupts */ 198 ecr &= ~PPC_SERVICE_INTR; 199 ppc->ppc_irqstat = PPC_IRQ_DMA; 200 w_ecr(ppc, ecr); 201 202 isa_dmastart(ppc->ppc_dmaflags, ppc->ppc_dmaddr, ppc->ppc_dmacnt, 203 ppc->ppc_dmachan); 204 ppc->ppc_dmastat = PPC_DMA_STARTED; 205 206 #ifdef PPC_DEBUG 207 printf("s%d", ppc->ppc_dmacnt); 208 #endif 209 210 /* Wait for the DMA completed interrupt. We hope we won't 211 * miss it, otherwise a signal will be necessary to unlock the 212 * process. 213 */ 214 do { 215 /* release CPU */ 216 error = mtx_sleep(ppc, &ppc->ppc_lock, PPBPRI | PCATCH, 217 "ppcdma", 0); 218 } while (error == EWOULDBLOCK); 219 220 if (error) { 221 #ifdef PPC_DEBUG 222 printf("i"); 223 #endif 224 /* stop DMA */ 225 isa_dmadone(ppc->ppc_dmaflags, ppc->ppc_dmaddr, 226 ppc->ppc_dmacnt, ppc->ppc_dmachan); 227 228 /* no dma, no interrupt, flush the fifo */ 229 w_ecr(ppc, PPC_ECR_RESET); 230 231 ppc->ppc_dmastat = PPC_DMA_INTERRUPTED; 232 goto error; 233 } 234 235 /* wait for an empty fifo */ 236 while (!(r_ecr(ppc) & PPC_FIFO_EMPTY)) { 237 238 for (spin=100; spin; spin--) 239 if (r_ecr(ppc) & PPC_FIFO_EMPTY) 240 goto fifo_empty; 241 #ifdef PPC_DEBUG 242 printf("Z"); 243 #endif 244 error = mtx_sleep(ppc, &ppc->ppc_lock, PPBPRI | PCATCH, 245 "ppcfifo", hz / 100); 246 if (error != EWOULDBLOCK) { 247 #ifdef PPC_DEBUG 248 printf("I"); 249 #endif 250 /* no dma, no interrupt, flush the fifo */ 251 w_ecr(ppc, PPC_ECR_RESET); 252 253 ppc->ppc_dmastat = PPC_DMA_INTERRUPTED; 254 error = EINTR; 255 goto error; 256 } 257 } 258 259 fifo_empty: 260 /* no dma, no interrupt, flush the fifo */ 261 w_ecr(ppc, PPC_ECR_RESET); 262 263 error: 264 /* PDRQ must be kept unasserted until nPDACK is 265 * deasserted for a minimum of 350ns (SMC datasheet) 266 * 267 * Consequence may be a FIFO that never empty 268 */ 269 DELAY(1); 270 271 w_ecr(ppc, ecr_sav); 272 w_ctr(ppc, ctr_sav); 273 return (error); 274 } 275 276 DRIVER_MODULE(ppc, isa, ppc_isa_driver, ppc_devclass, 0, 0); 277 ISA_PNP_INFO(lpc_ids); 278