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/cdefs.h>
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
35 #include <sys/lock.h>
36 #include <sys/module.h>
37 #include <sys/mutex.h>
38 #include <sys/bus.h>
39 #include <machine/bus.h>
40 #include <sys/malloc.h>
41 #include <sys/rman.h>
42
43 #include <isa/isavar.h>
44
45 #include <dev/ppbus/ppbconf.h>
46 #include <dev/ppbus/ppb_msq.h>
47 #include <dev/ppc/ppcvar.h>
48 #include <dev/ppc/ppcreg.h>
49
50 #include "ppbus_if.h"
51
52 static int ppc_isa_probe(device_t dev);
53
54 int ppc_isa_attach(device_t dev);
55 int ppc_isa_write(device_t, char *, int, int);
56
57 static device_method_t ppc_isa_methods[] = {
58 /* device interface */
59 DEVMETHOD(device_probe, ppc_isa_probe),
60 DEVMETHOD(device_attach, ppc_isa_attach),
61 DEVMETHOD(device_detach, ppc_detach),
62
63 /* bus interface */
64 DEVMETHOD(bus_read_ivar, ppc_read_ivar),
65 DEVMETHOD(bus_write_ivar, ppc_write_ivar),
66 DEVMETHOD(bus_alloc_resource, ppc_alloc_resource),
67 DEVMETHOD(bus_release_resource, ppc_release_resource),
68
69 /* ppbus interface */
70 DEVMETHOD(ppbus_io, ppc_io),
71 DEVMETHOD(ppbus_exec_microseq, ppc_exec_microseq),
72 DEVMETHOD(ppbus_reset_epp, ppc_reset_epp),
73 DEVMETHOD(ppbus_setmode, ppc_setmode),
74 DEVMETHOD(ppbus_ecp_sync, ppc_ecp_sync),
75 DEVMETHOD(ppbus_read, ppc_read),
76 DEVMETHOD(ppbus_write, ppc_isa_write),
77 { 0, 0 }
78 };
79
80 static driver_t ppc_isa_driver = {
81 ppc_driver_name,
82 ppc_isa_methods,
83 sizeof(struct ppc_data),
84 };
85
86 static struct isa_pnp_id lpc_ids[] = {
87 { 0x0004d041, "Standard parallel printer port" }, /* PNP0400 */
88 { 0x0104d041, "ECP parallel printer port" }, /* PNP0401 */
89 { 0 }
90 };
91
92 static void
ppc_isa_dmadone(struct ppc_data * ppc)93 ppc_isa_dmadone(struct ppc_data *ppc)
94 {
95 isa_dmadone(ppc->ppc_dmaflags, ppc->ppc_dmaddr, ppc->ppc_dmacnt,
96 ppc->ppc_dmachan);
97 }
98
99 int
ppc_isa_attach(device_t dev)100 ppc_isa_attach(device_t dev)
101 {
102 struct ppc_data *ppc = device_get_softc(dev);
103
104 if ((ppc->ppc_avm & PPB_ECP) && (ppc->ppc_dmachan > 0)) {
105 /* acquire the DMA channel forever */ /* XXX */
106 isa_dma_acquire(ppc->ppc_dmachan);
107 isa_dmainit(ppc->ppc_dmachan, 1024); /* nlpt.BUFSIZE */
108 ppc->ppc_dmadone = ppc_isa_dmadone;
109 }
110
111 return (ppc_attach(dev));
112 }
113
114 static int
ppc_isa_probe(device_t dev)115 ppc_isa_probe(device_t dev)
116 {
117 device_t parent;
118 int error;
119
120 parent = device_get_parent(dev);
121
122 error = ISA_PNP_PROBE(parent, dev, lpc_ids);
123 if (error == ENXIO)
124 return (ENXIO);
125 if (error != 0) /* XXX shall be set after detection */
126 device_set_desc(dev, "Parallel port");
127
128 return (ppc_probe(dev, 0));
129 }
130
131 /*
132 * Call this function if you want to send data in any advanced mode
133 * of your parallel port: FIFO, DMA
134 *
135 * If what you want is not possible (no ECP, no DMA...),
136 * EINVAL is returned
137 */
138 int
ppc_isa_write(device_t dev,char * buf,int len,int how)139 ppc_isa_write(device_t dev, char *buf, int len, int how)
140 {
141 struct ppc_data *ppc = device_get_softc(dev);
142 char ecr, ecr_sav, ctr, ctr_sav;
143 int error = 0;
144 int spin;
145
146 PPC_ASSERT_LOCKED(ppc);
147 if (!(ppc->ppc_avm & PPB_ECP))
148 return (EINVAL);
149 if (ppc->ppc_dmachan == 0)
150 return (EINVAL);
151
152 #ifdef PPC_DEBUG
153 printf("w");
154 #endif
155
156 ecr_sav = r_ecr(ppc);
157 ctr_sav = r_ctr(ppc);
158
159 /*
160 * Send buffer with DMA, FIFO and interrupts
161 */
162
163 /* byte mode, no intr, no DMA, dir=0, flush fifo */
164 ecr = PPC_ECR_STD | PPC_DISABLE_INTR;
165 w_ecr(ppc, ecr);
166
167 /* disable nAck interrupts */
168 ctr = r_ctr(ppc);
169 ctr &= ~IRQENABLE;
170 w_ctr(ppc, ctr);
171
172 ppc->ppc_dmaflags = 0;
173 ppc->ppc_dmaddr = (caddr_t)buf;
174 ppc->ppc_dmacnt = (u_int)len;
175
176 switch (ppc->ppc_mode) {
177 case PPB_COMPATIBLE:
178 /* compatible mode with FIFO, no intr, DMA, dir=0 */
179 ecr = PPC_ECR_FIFO | PPC_DISABLE_INTR | PPC_ENABLE_DMA;
180 break;
181 case PPB_ECP:
182 ecr = PPC_ECR_ECP | PPC_DISABLE_INTR | PPC_ENABLE_DMA;
183 break;
184 default:
185 error = EINVAL;
186 goto error;
187 }
188
189 w_ecr(ppc, ecr);
190 ecr = r_ecr(ppc);
191
192 ppc->ppc_dmastat = PPC_DMA_INIT;
193
194 /* enable interrupts */
195 ecr &= ~PPC_SERVICE_INTR;
196 ppc->ppc_irqstat = PPC_IRQ_DMA;
197 w_ecr(ppc, ecr);
198
199 isa_dmastart(ppc->ppc_dmaflags, ppc->ppc_dmaddr, ppc->ppc_dmacnt,
200 ppc->ppc_dmachan);
201 ppc->ppc_dmastat = PPC_DMA_STARTED;
202
203 #ifdef PPC_DEBUG
204 printf("s%d", ppc->ppc_dmacnt);
205 #endif
206
207 /* Wait for the DMA completed interrupt. We hope we won't
208 * miss it, otherwise a signal will be necessary to unlock the
209 * process.
210 */
211 do {
212 /* release CPU */
213 error = mtx_sleep(ppc, &ppc->ppc_lock, PPBPRI | PCATCH,
214 "ppcdma", 0);
215 } while (error == EWOULDBLOCK);
216
217 if (error) {
218 #ifdef PPC_DEBUG
219 printf("i");
220 #endif
221 /* stop DMA */
222 isa_dmadone(ppc->ppc_dmaflags, ppc->ppc_dmaddr,
223 ppc->ppc_dmacnt, ppc->ppc_dmachan);
224
225 /* no dma, no interrupt, flush the fifo */
226 w_ecr(ppc, PPC_ECR_RESET);
227
228 ppc->ppc_dmastat = PPC_DMA_INTERRUPTED;
229 goto error;
230 }
231
232 /* wait for an empty fifo */
233 while (!(r_ecr(ppc) & PPC_FIFO_EMPTY)) {
234 for (spin=100; spin; spin--)
235 if (r_ecr(ppc) & PPC_FIFO_EMPTY)
236 goto fifo_empty;
237 #ifdef PPC_DEBUG
238 printf("Z");
239 #endif
240 error = mtx_sleep(ppc, &ppc->ppc_lock, PPBPRI | PCATCH,
241 "ppcfifo", hz / 100);
242 if (error != EWOULDBLOCK) {
243 #ifdef PPC_DEBUG
244 printf("I");
245 #endif
246 /* no dma, no interrupt, flush the fifo */
247 w_ecr(ppc, PPC_ECR_RESET);
248
249 ppc->ppc_dmastat = PPC_DMA_INTERRUPTED;
250 error = EINTR;
251 goto error;
252 }
253 }
254
255 fifo_empty:
256 /* no dma, no interrupt, flush the fifo */
257 w_ecr(ppc, PPC_ECR_RESET);
258
259 error:
260 /* PDRQ must be kept unasserted until nPDACK is
261 * deasserted for a minimum of 350ns (SMC datasheet)
262 *
263 * Consequence may be a FIFO that never empty
264 */
265 DELAY(1);
266
267 w_ecr(ppc, ecr_sav);
268 w_ctr(ppc, ctr_sav);
269 return (error);
270 }
271
272 DRIVER_MODULE(ppc, isa, ppc_isa_driver, 0, 0);
273 ISA_PNP_INFO(lpc_ids);
274