2 * Copyright (c) 1997-2000 Nicolas Souchu
3 * Copyright (c) 2001 Alcove - Nicolas Souchu
4 * Copyright (c) 2006 Marcel Moolenaar
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/kernel.h>
36 #include <sys/module.h>
37 #include <sys/mutex.h>
39 #include <machine/bus.h>
40 #include <sys/malloc.h>
43 #include <isa/isavar.h>
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>
52 static int ppc_isa_probe(device_t dev);
54 int ppc_isa_attach(device_t dev);
55 int ppc_isa_write(device_t, char *, int, int);
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),
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),
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),
81 static driver_t ppc_isa_driver = {
84 sizeof(struct ppc_data),
87 static struct isa_pnp_id lpc_ids[] = {
88 { 0x0004d041, "Standard parallel printer port" }, /* PNP0400 */
89 { 0x0104d041, "ECP parallel printer port" }, /* PNP0401 */
94 ppc_isa_dmadone(struct ppc_data *ppc)
96 isa_dmadone(ppc->ppc_dmaflags, ppc->ppc_dmaddr, ppc->ppc_dmacnt,
101 ppc_isa_attach(device_t dev)
103 struct ppc_data *ppc = device_get_softc(dev);
105 if ((ppc->ppc_avm & PPB_ECP) && (ppc->ppc_dmachan > 0)) {
106 /* acquire the DMA channel forever */ /* XXX */
107 isa_dma_acquire(ppc->ppc_dmachan);
108 isa_dmainit(ppc->ppc_dmachan, 1024); /* nlpt.BUFSIZE */
109 ppc->ppc_dmadone = ppc_isa_dmadone;
112 return (ppc_attach(dev));
116 ppc_isa_probe(device_t dev)
121 parent = device_get_parent(dev);
123 error = ISA_PNP_PROBE(parent, dev, lpc_ids);
126 if (error != 0) /* XXX shall be set after detection */
127 device_set_desc(dev, "Parallel port");
129 return (ppc_probe(dev, 0));
133 * Call this function if you want to send data in any advanced mode
134 * of your parallel port: FIFO, DMA
136 * If what you want is not possible (no ECP, no DMA...),
140 ppc_isa_write(device_t dev, char *buf, int len, int how)
142 struct ppc_data *ppc = device_get_softc(dev);
143 char ecr, ecr_sav, ctr, ctr_sav;
147 PPC_ASSERT_LOCKED(ppc);
148 if (!(ppc->ppc_avm & PPB_ECP))
150 if (ppc->ppc_dmachan == 0)
157 ecr_sav = r_ecr(ppc);
158 ctr_sav = r_ctr(ppc);
161 * Send buffer with DMA, FIFO and interrupts
164 /* byte mode, no intr, no DMA, dir=0, flush fifo */
165 ecr = PPC_ECR_STD | PPC_DISABLE_INTR;
168 /* disable nAck interrupts */
173 ppc->ppc_dmaflags = 0;
174 ppc->ppc_dmaddr = (caddr_t)buf;
175 ppc->ppc_dmacnt = (u_int)len;
177 switch (ppc->ppc_mode) {
179 /* compatible mode with FIFO, no intr, DMA, dir=0 */
180 ecr = PPC_ECR_FIFO | PPC_DISABLE_INTR | PPC_ENABLE_DMA;
183 ecr = PPC_ECR_ECP | PPC_DISABLE_INTR | PPC_ENABLE_DMA;
193 ppc->ppc_dmastat = PPC_DMA_INIT;
195 /* enable interrupts */
196 ecr &= ~PPC_SERVICE_INTR;
197 ppc->ppc_irqstat = PPC_IRQ_DMA;
200 isa_dmastart(ppc->ppc_dmaflags, ppc->ppc_dmaddr, ppc->ppc_dmacnt,
202 ppc->ppc_dmastat = PPC_DMA_STARTED;
205 printf("s%d", ppc->ppc_dmacnt);
208 /* Wait for the DMA completed interrupt. We hope we won't
209 * miss it, otherwise a signal will be necessary to unlock the
214 error = mtx_sleep(ppc, &ppc->ppc_lock, PPBPRI | PCATCH,
216 } while (error == EWOULDBLOCK);
223 isa_dmadone(ppc->ppc_dmaflags, ppc->ppc_dmaddr,
224 ppc->ppc_dmacnt, ppc->ppc_dmachan);
226 /* no dma, no interrupt, flush the fifo */
227 w_ecr(ppc, PPC_ECR_RESET);
229 ppc->ppc_dmastat = PPC_DMA_INTERRUPTED;
233 /* wait for an empty fifo */
234 while (!(r_ecr(ppc) & PPC_FIFO_EMPTY)) {
236 for (spin=100; spin; spin--)
237 if (r_ecr(ppc) & PPC_FIFO_EMPTY)
242 error = mtx_sleep(ppc, &ppc->ppc_lock, PPBPRI | PCATCH,
243 "ppcfifo", hz / 100);
244 if (error != EWOULDBLOCK) {
248 /* no dma, no interrupt, flush the fifo */
249 w_ecr(ppc, PPC_ECR_RESET);
251 ppc->ppc_dmastat = PPC_DMA_INTERRUPTED;
258 /* no dma, no interrupt, flush the fifo */
259 w_ecr(ppc, PPC_ECR_RESET);
262 /* PDRQ must be kept unasserted until nPDACK is
263 * deasserted for a minimum of 350ns (SMC datasheet)
265 * Consequence may be a FIFO that never empty
274 DRIVER_MODULE(ppc, isa, ppc_isa_driver, ppc_devclass, 0, 0);