1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/param.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/lock.h> 35 #include <sys/module.h> 36 #include <sys/mutex.h> 37 #include <sys/bus.h> 38 #include <machine/bus.h> 39 #include <sys/malloc.h> 40 #include <sys/rman.h> 41 42 #include <isa/isavar.h> 43 44 #include <dev/ppbus/ppbconf.h> 45 #include <dev/ppbus/ppb_msq.h> 46 #include <dev/ppc/ppcvar.h> 47 #include <dev/ppc/ppcreg.h> 48 49 #include "ppbus_if.h" 50 51 static int ppc_isa_probe(device_t dev); 52 53 int ppc_isa_attach(device_t dev); 54 int ppc_isa_write(device_t, char *, int, int); 55 56 static device_method_t ppc_isa_methods[] = { 57 /* device interface */ 58 DEVMETHOD(device_probe, ppc_isa_probe), 59 DEVMETHOD(device_attach, ppc_isa_attach), 60 DEVMETHOD(device_detach, ppc_detach), 61 62 /* bus interface */ 63 DEVMETHOD(bus_read_ivar, ppc_read_ivar), 64 DEVMETHOD(bus_write_ivar, ppc_write_ivar), 65 DEVMETHOD(bus_alloc_resource, ppc_alloc_resource), 66 DEVMETHOD(bus_release_resource, ppc_release_resource), 67 68 /* ppbus interface */ 69 DEVMETHOD(ppbus_io, ppc_io), 70 DEVMETHOD(ppbus_exec_microseq, ppc_exec_microseq), 71 DEVMETHOD(ppbus_reset_epp, ppc_reset_epp), 72 DEVMETHOD(ppbus_setmode, ppc_setmode), 73 DEVMETHOD(ppbus_ecp_sync, ppc_ecp_sync), 74 DEVMETHOD(ppbus_read, ppc_read), 75 DEVMETHOD(ppbus_write, ppc_isa_write), 76 { 0, 0 } 77 }; 78 79 static driver_t ppc_isa_driver = { 80 ppc_driver_name, 81 ppc_isa_methods, 82 sizeof(struct ppc_data), 83 }; 84 85 static struct isa_pnp_id lpc_ids[] = { 86 { 0x0004d041, "Standard parallel printer port" }, /* PNP0400 */ 87 { 0x0104d041, "ECP parallel printer port" }, /* PNP0401 */ 88 { 0 } 89 }; 90 91 static void 92 ppc_isa_dmadone(struct ppc_data *ppc) 93 { 94 isa_dmadone(ppc->ppc_dmaflags, ppc->ppc_dmaddr, ppc->ppc_dmacnt, 95 ppc->ppc_dmachan); 96 } 97 98 int 99 ppc_isa_attach(device_t dev) 100 { 101 struct ppc_data *ppc = device_get_softc(dev); 102 103 if ((ppc->ppc_avm & PPB_ECP) && (ppc->ppc_dmachan > 0)) { 104 /* acquire the DMA channel forever */ /* XXX */ 105 isa_dma_acquire(ppc->ppc_dmachan); 106 isa_dmainit(ppc->ppc_dmachan, 1024); /* nlpt.BUFSIZE */ 107 ppc->ppc_dmadone = ppc_isa_dmadone; 108 } 109 110 return (ppc_attach(dev)); 111 } 112 113 static int 114 ppc_isa_probe(device_t dev) 115 { 116 device_t parent; 117 int error; 118 119 parent = device_get_parent(dev); 120 121 error = ISA_PNP_PROBE(parent, dev, lpc_ids); 122 if (error == ENXIO) 123 return (ENXIO); 124 if (error != 0) /* XXX shall be set after detection */ 125 device_set_desc(dev, "Parallel port"); 126 127 return (ppc_probe(dev, 0)); 128 } 129 130 /* 131 * Call this function if you want to send data in any advanced mode 132 * of your parallel port: FIFO, DMA 133 * 134 * If what you want is not possible (no ECP, no DMA...), 135 * EINVAL is returned 136 */ 137 int 138 ppc_isa_write(device_t dev, char *buf, int len, int how) 139 { 140 struct ppc_data *ppc = device_get_softc(dev); 141 char ecr, ecr_sav, ctr, ctr_sav; 142 int error = 0; 143 int spin; 144 145 PPC_ASSERT_LOCKED(ppc); 146 if (!(ppc->ppc_avm & PPB_ECP)) 147 return (EINVAL); 148 if (ppc->ppc_dmachan == 0) 149 return (EINVAL); 150 151 #ifdef PPC_DEBUG 152 printf("w"); 153 #endif 154 155 ecr_sav = r_ecr(ppc); 156 ctr_sav = r_ctr(ppc); 157 158 /* 159 * Send buffer with DMA, FIFO and interrupts 160 */ 161 162 /* byte mode, no intr, no DMA, dir=0, flush fifo */ 163 ecr = PPC_ECR_STD | PPC_DISABLE_INTR; 164 w_ecr(ppc, ecr); 165 166 /* disable nAck interrupts */ 167 ctr = r_ctr(ppc); 168 ctr &= ~IRQENABLE; 169 w_ctr(ppc, ctr); 170 171 ppc->ppc_dmaflags = 0; 172 ppc->ppc_dmaddr = (caddr_t)buf; 173 ppc->ppc_dmacnt = (u_int)len; 174 175 switch (ppc->ppc_mode) { 176 case PPB_COMPATIBLE: 177 /* compatible mode with FIFO, no intr, DMA, dir=0 */ 178 ecr = PPC_ECR_FIFO | PPC_DISABLE_INTR | PPC_ENABLE_DMA; 179 break; 180 case PPB_ECP: 181 ecr = PPC_ECR_ECP | PPC_DISABLE_INTR | PPC_ENABLE_DMA; 182 break; 183 default: 184 error = EINVAL; 185 goto error; 186 } 187 188 w_ecr(ppc, ecr); 189 ecr = r_ecr(ppc); 190 191 ppc->ppc_dmastat = PPC_DMA_INIT; 192 193 /* enable interrupts */ 194 ecr &= ~PPC_SERVICE_INTR; 195 ppc->ppc_irqstat = PPC_IRQ_DMA; 196 w_ecr(ppc, ecr); 197 198 isa_dmastart(ppc->ppc_dmaflags, ppc->ppc_dmaddr, ppc->ppc_dmacnt, 199 ppc->ppc_dmachan); 200 ppc->ppc_dmastat = PPC_DMA_STARTED; 201 202 #ifdef PPC_DEBUG 203 printf("s%d", ppc->ppc_dmacnt); 204 #endif 205 206 /* Wait for the DMA completed interrupt. We hope we won't 207 * miss it, otherwise a signal will be necessary to unlock the 208 * process. 209 */ 210 do { 211 /* release CPU */ 212 error = mtx_sleep(ppc, &ppc->ppc_lock, PPBPRI | PCATCH, 213 "ppcdma", 0); 214 } while (error == EWOULDBLOCK); 215 216 if (error) { 217 #ifdef PPC_DEBUG 218 printf("i"); 219 #endif 220 /* stop DMA */ 221 isa_dmadone(ppc->ppc_dmaflags, ppc->ppc_dmaddr, 222 ppc->ppc_dmacnt, ppc->ppc_dmachan); 223 224 /* no dma, no interrupt, flush the fifo */ 225 w_ecr(ppc, PPC_ECR_RESET); 226 227 ppc->ppc_dmastat = PPC_DMA_INTERRUPTED; 228 goto error; 229 } 230 231 /* wait for an empty fifo */ 232 while (!(r_ecr(ppc) & PPC_FIFO_EMPTY)) { 233 for (spin=100; spin; spin--) 234 if (r_ecr(ppc) & PPC_FIFO_EMPTY) 235 goto fifo_empty; 236 #ifdef PPC_DEBUG 237 printf("Z"); 238 #endif 239 error = mtx_sleep(ppc, &ppc->ppc_lock, PPBPRI | PCATCH, 240 "ppcfifo", hz / 100); 241 if (error != EWOULDBLOCK) { 242 #ifdef PPC_DEBUG 243 printf("I"); 244 #endif 245 /* no dma, no interrupt, flush the fifo */ 246 w_ecr(ppc, PPC_ECR_RESET); 247 248 ppc->ppc_dmastat = PPC_DMA_INTERRUPTED; 249 error = EINTR; 250 goto error; 251 } 252 } 253 254 fifo_empty: 255 /* no dma, no interrupt, flush the fifo */ 256 w_ecr(ppc, PPC_ECR_RESET); 257 258 error: 259 /* PDRQ must be kept unasserted until nPDACK is 260 * deasserted for a minimum of 350ns (SMC datasheet) 261 * 262 * Consequence may be a FIFO that never empty 263 */ 264 DELAY(1); 265 266 w_ecr(ppc, ecr_sav); 267 w_ctr(ppc, ctr_sav); 268 return (error); 269 } 270 271 DRIVER_MODULE(ppc, isa, ppc_isa_driver, 0, 0); 272 ISA_PNP_INFO(lpc_ids); 273