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
ppc_isa_dmadone(struct ppc_data * ppc)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
ppc_isa_attach(device_t dev)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
ppc_isa_probe(device_t dev)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
ppc_isa_write(device_t dev,char * buf,int len,int how)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