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 { 0, 0 } 80 }; 81 82 static driver_t ppc_isa_driver = { 83 ppc_driver_name, 84 ppc_isa_methods, 85 sizeof(struct ppc_data), 86 }; 87 88 static struct isa_pnp_id lpc_ids[] = { 89 { 0x0004d041, "Standard parallel printer port" }, /* PNP0400 */ 90 { 0x0104d041, "ECP parallel printer port" }, /* PNP0401 */ 91 { 0 } 92 }; 93 94 static void 95 ppc_isa_dmadone(struct ppc_data *ppc) 96 { 97 isa_dmadone(ppc->ppc_dmaflags, ppc->ppc_dmaddr, ppc->ppc_dmacnt, 98 ppc->ppc_dmachan); 99 } 100 101 int 102 ppc_isa_attach(device_t dev) 103 { 104 struct ppc_data *ppc = device_get_softc(dev); 105 106 if ((ppc->ppc_avm & PPB_ECP) && (ppc->ppc_dmachan > 0)) { 107 /* acquire the DMA channel forever */ /* XXX */ 108 isa_dma_acquire(ppc->ppc_dmachan); 109 isa_dmainit(ppc->ppc_dmachan, 1024); /* nlpt.BUFSIZE */ 110 ppc->ppc_dmadone = ppc_isa_dmadone; 111 } 112 113 return (ppc_attach(dev)); 114 } 115 116 static int 117 ppc_isa_probe(device_t dev) 118 { 119 device_t parent; 120 int error; 121 122 parent = device_get_parent(dev); 123 124 error = ISA_PNP_PROBE(parent, dev, lpc_ids); 125 if (error == ENXIO) 126 return (ENXIO); 127 if (error != 0) /* XXX shall be set after detection */ 128 device_set_desc(dev, "Parallel port"); 129 130 return (ppc_probe(dev, 0)); 131 } 132 133 /* 134 * Call this function if you want to send data in any advanced mode 135 * of your parallel port: FIFO, DMA 136 * 137 * If what you want is not possible (no ECP, no DMA...), 138 * EINVAL is returned 139 */ 140 int 141 ppc_isa_write(device_t dev, char *buf, int len, int how) 142 { 143 struct ppc_data *ppc = device_get_softc(dev); 144 char ecr, ecr_sav, ctr, ctr_sav; 145 int error = 0; 146 int spin; 147 148 PPC_ASSERT_LOCKED(ppc); 149 if (!(ppc->ppc_avm & PPB_ECP)) 150 return (EINVAL); 151 if (ppc->ppc_dmachan == 0) 152 return (EINVAL); 153 154 #ifdef PPC_DEBUG 155 printf("w"); 156 #endif 157 158 ecr_sav = r_ecr(ppc); 159 ctr_sav = r_ctr(ppc); 160 161 /* 162 * Send buffer with DMA, FIFO and interrupts 163 */ 164 165 /* byte mode, no intr, no DMA, dir=0, flush fifo */ 166 ecr = PPC_ECR_STD | PPC_DISABLE_INTR; 167 w_ecr(ppc, ecr); 168 169 /* disable nAck interrupts */ 170 ctr = r_ctr(ppc); 171 ctr &= ~IRQENABLE; 172 w_ctr(ppc, ctr); 173 174 ppc->ppc_dmaflags = 0; 175 ppc->ppc_dmaddr = (caddr_t)buf; 176 ppc->ppc_dmacnt = (u_int)len; 177 178 switch (ppc->ppc_mode) { 179 case PPB_COMPATIBLE: 180 /* compatible mode with FIFO, no intr, DMA, dir=0 */ 181 ecr = PPC_ECR_FIFO | PPC_DISABLE_INTR | PPC_ENABLE_DMA; 182 break; 183 case PPB_ECP: 184 ecr = PPC_ECR_ECP | PPC_DISABLE_INTR | PPC_ENABLE_DMA; 185 break; 186 default: 187 error = EINVAL; 188 goto error; 189 } 190 191 w_ecr(ppc, ecr); 192 ecr = r_ecr(ppc); 193 194 ppc->ppc_dmastat = PPC_DMA_INIT; 195 196 /* enable interrupts */ 197 ecr &= ~PPC_SERVICE_INTR; 198 ppc->ppc_irqstat = PPC_IRQ_DMA; 199 w_ecr(ppc, ecr); 200 201 isa_dmastart(ppc->ppc_dmaflags, ppc->ppc_dmaddr, ppc->ppc_dmacnt, 202 ppc->ppc_dmachan); 203 ppc->ppc_dmastat = PPC_DMA_STARTED; 204 205 #ifdef PPC_DEBUG 206 printf("s%d", ppc->ppc_dmacnt); 207 #endif 208 209 /* Wait for the DMA completed interrupt. We hope we won't 210 * miss it, otherwise a signal will be necessary to unlock the 211 * process. 212 */ 213 do { 214 /* release CPU */ 215 error = mtx_sleep(ppc, &ppc->ppc_lock, PPBPRI | PCATCH, 216 "ppcdma", 0); 217 } while (error == EWOULDBLOCK); 218 219 if (error) { 220 #ifdef PPC_DEBUG 221 printf("i"); 222 #endif 223 /* stop DMA */ 224 isa_dmadone(ppc->ppc_dmaflags, ppc->ppc_dmaddr, 225 ppc->ppc_dmacnt, ppc->ppc_dmachan); 226 227 /* no dma, no interrupt, flush the fifo */ 228 w_ecr(ppc, PPC_ECR_RESET); 229 230 ppc->ppc_dmastat = PPC_DMA_INTERRUPTED; 231 goto error; 232 } 233 234 /* wait for an empty fifo */ 235 while (!(r_ecr(ppc) & PPC_FIFO_EMPTY)) { 236 for (spin=100; spin; spin--) 237 if (r_ecr(ppc) & PPC_FIFO_EMPTY) 238 goto fifo_empty; 239 #ifdef PPC_DEBUG 240 printf("Z"); 241 #endif 242 error = mtx_sleep(ppc, &ppc->ppc_lock, PPBPRI | PCATCH, 243 "ppcfifo", hz / 100); 244 if (error != EWOULDBLOCK) { 245 #ifdef PPC_DEBUG 246 printf("I"); 247 #endif 248 /* no dma, no interrupt, flush the fifo */ 249 w_ecr(ppc, PPC_ECR_RESET); 250 251 ppc->ppc_dmastat = PPC_DMA_INTERRUPTED; 252 error = EINTR; 253 goto error; 254 } 255 } 256 257 fifo_empty: 258 /* no dma, no interrupt, flush the fifo */ 259 w_ecr(ppc, PPC_ECR_RESET); 260 261 error: 262 /* PDRQ must be kept unasserted until nPDACK is 263 * deasserted for a minimum of 350ns (SMC datasheet) 264 * 265 * Consequence may be a FIFO that never empty 266 */ 267 DELAY(1); 268 269 w_ecr(ppc, ecr_sav); 270 w_ctr(ppc, ctr_sav); 271 return (error); 272 } 273 274 DRIVER_MODULE(ppc, isa, ppc_isa_driver, 0, 0); 275 ISA_PNP_INFO(lpc_ids); 276