1 /* $NetBSD: atppc_isa.c,v 1.17 2022/09/25 17:09:36 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2001 Alcove - Nicolas Souchu
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
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.
15 *
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
26 * SUCH DAMAGE.
27 *
28 * FreeBSD: src/sys/isa/ppc.c,v 1.26.2.5 2001/10/02 05:21:45 nsouch Exp
29 *
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: atppc_isa.c,v 1.17 2022/09/25 17:09:36 thorpej Exp $");
34
35 #include "opt_atppc.h"
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
40 #include <sys/device.h>
41
42 #include <sys/intr.h>
43 #include <sys/bus.h>
44
45 #include <dev/isa/isareg.h>
46 #include <dev/isa/isavar.h>
47 #include <dev/isa/isadmavar.h>
48
49 #include <dev/ic/atppcreg.h>
50 #include <dev/ic/atppcvar.h>
51 #include <dev/isa/atppc_isadma.h>
52
53 /*
54 * ISA bus attach code for atppc driver.
55 * Note on capabilities: capabilities may exist in the chipset but may not
56 * necessarily be useable. I.e. you may specify an IRQ in the autoconfig, but
57 * will the port actually have an IRQ assigned to it at the hardware level?
58 * How can you test if the capabilities can be used? For interrupts, see if a
59 * handler exists (sc_intr != NULL). For DMA, see if the sc_dma_start() and
60 * sc_dma_finish() function pointers are not NULL.
61 */
62
63 /* Configuration data for atppc on isa bus. */
64 struct atppc_isa_softc {
65 /* Machine independent device data */
66 struct atppc_softc sc_atppc;
67
68 /* IRQ/DRQ/IO Port assignments on ISA bus */
69 int sc_irq;
70 int sc_drq;
71 int sc_iobase;
72
73 /* ISA chipset tag */
74 isa_chipset_tag_t sc_ic;
75 };
76
77 /* Probe and attach functions for a atppc device on the ISA bus. */
78 static int atppc_isa_probe(device_t, cfdata_t, void *);
79 static void atppc_isa_attach(device_t, device_t, void *);
80
81 static int atppc_isa_dma_start(struct atppc_softc *, void *, u_int,
82 u_int8_t);
83 static int atppc_isa_dma_finish(struct atppc_softc *);
84 static int atppc_isa_dma_abort(struct atppc_softc *);
85 static int atppc_isa_dma_malloc(device_t, void **, bus_addr_t *,
86 bus_size_t);
87 static void atppc_isa_dma_free(device_t, void **, bus_addr_t *,
88 bus_size_t);
89
90 CFATTACH_DECL_NEW(atppc_isa, sizeof(struct atppc_isa_softc), atppc_isa_probe,
91 atppc_isa_attach, NULL, NULL);
92
93 /*
94 * Probe function: find parallel port controller on isa bus. Combined from
95 * lpt_isa_probe() in lpt.c and atppc_detect_port() from FreeBSD's ppc.c.
96 */
97 static int
atppc_isa_probe(device_t parent,cfdata_t cf,void * aux)98 atppc_isa_probe(device_t parent, cfdata_t cf, void *aux)
99 {
100 bus_space_handle_t ioh;
101 struct isa_attach_args *ia = aux;
102 bus_space_tag_t iot = ia->ia_iot;
103 int rval = 0;
104
105 if (ia->ia_nio < 1)
106 return (0);
107
108 /* Disallow wildcarded i/o address */
109 if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
110 return (0);
111
112 if (bus_space_map(iot, ia->ia_io[0].ir_addr, IO_LPTSIZE, 0, &ioh))
113 return (0);
114
115 if (atppc_detect_port(iot, ioh) == 0)
116 rval = 1;
117
118 bus_space_unmap(iot, ioh, IO_LPTSIZE);
119
120 if (rval) {
121 ia->ia_nio = 1;
122 ia->ia_io[0].ir_size = IO_LPTSIZE;
123 ia->ia_nirq = 1;
124 ia->ia_ndrq = 1;
125 ia->ia_niomem = 0;
126 }
127 return (rval);
128 }
129
130 /* Attach function: attach and configure parallel port controller on isa bus. */
131 static void
atppc_isa_attach(device_t parent,device_t self,void * aux)132 atppc_isa_attach(device_t parent, device_t self, void *aux)
133 {
134 struct atppc_isa_softc *sc = device_private(self);
135 struct atppc_softc *lsc = &sc->sc_atppc;
136 struct isa_attach_args *ia = aux;
137
138 printf(": AT Parallel Port\n");
139
140 lsc->sc_iot = ia->ia_iot;
141 lsc->sc_dmat = ia->ia_dmat;
142 lsc->sc_has = 0;
143 sc->sc_ic = ia->ia_ic;
144 sc->sc_iobase = ia->ia_io->ir_addr;
145
146 if (bus_space_map(lsc->sc_iot, sc->sc_iobase, IO_LPTSIZE, 0,
147 &lsc->sc_ioh) != 0) {
148 aprint_error_dev(self, "attempt to map bus space failed, device not "
149 "properly attached.\n");
150 lsc->sc_dev_ok = ATPPC_NOATTACH;
151 return;
152 }
153
154 lsc->sc_dev = self;
155 lsc->sc_dev_ok = ATPPC_ATTACHED;
156
157 /* Assign interrupt handler */
158 if (!(device_cfdata(self)->cf_flags & ATPPC_FLAG_DISABLE_INTR)
159 && ia->ia_irq->ir_irq != ISA_UNKNOWN_IRQ
160 && ia->ia_nirq >= 1) {
161 sc->sc_irq = ia->ia_irq[0].ir_irq;
162 } else
163 sc->sc_irq = -1;
164
165 if (sc->sc_irq > 0) {
166 /* Establish interrupt handler. */
167 lsc->sc_ieh = isa_intr_establish(sc->sc_ic, sc->sc_irq,
168 IST_EDGE, IPL_TTY, atppcintr, lsc->sc_dev);
169
170 lsc->sc_has |= ATPPC_HAS_INTR;
171 }
172
173 /* Configure DMA */
174 if (!(device_cfdata(self)->cf_flags & ATPPC_FLAG_DISABLE_DMA)
175 && ia->ia_drq->ir_drq != ISA_UNKNOWN_DRQ
176 && ia->ia_ndrq >= 1)
177 sc->sc_drq = ia->ia_drq[0].ir_drq;
178 else
179 sc->sc_drq = -1;
180
181 if (sc->sc_drq != -1
182 && atppc_isadma_setup(lsc, sc->sc_ic, sc->sc_drq) == 0) {
183 lsc->sc_has |= ATPPC_HAS_DMA;
184
185 /* setup DMA hooks */
186 lsc->sc_dma_start = atppc_isa_dma_start;
187 lsc->sc_dma_finish = atppc_isa_dma_finish;
188 lsc->sc_dma_abort = atppc_isa_dma_abort;
189 lsc->sc_dma_malloc = atppc_isa_dma_malloc;
190 lsc->sc_dma_free = atppc_isa_dma_free;
191 }
192
193 /* Run soft configuration attach */
194 atppc_sc_attach(lsc);
195
196 return;
197 }
198
199 /* Start DMA operation over ISA bus */
200 static int
atppc_isa_dma_start(struct atppc_softc * lsc,void * buf,u_int nbytes,u_int8_t mode)201 atppc_isa_dma_start(struct atppc_softc *lsc, void *buf, u_int nbytes,
202 u_int8_t mode)
203 {
204 struct atppc_isa_softc *sc = (struct atppc_isa_softc *) lsc;
205
206 return atppc_isadma_start(sc->sc_ic, sc->sc_drq, buf, nbytes, mode);
207 }
208
209 /* Stop DMA operation over ISA bus */
210 static int
atppc_isa_dma_finish(struct atppc_softc * lsc)211 atppc_isa_dma_finish(struct atppc_softc *lsc)
212 {
213 struct atppc_isa_softc *sc = (struct atppc_isa_softc *) lsc;
214
215 return atppc_isadma_finish(sc->sc_ic, sc->sc_drq);
216 }
217
218 /* Abort DMA operation over ISA bus */
219 static int
atppc_isa_dma_abort(struct atppc_softc * lsc)220 atppc_isa_dma_abort(struct atppc_softc *lsc)
221 {
222 struct atppc_isa_softc *sc = (struct atppc_isa_softc *) lsc;
223
224 return atppc_isadma_abort(sc->sc_ic, sc->sc_drq);
225 }
226
227 /* Allocate memory for DMA over ISA bus */
228 static int
atppc_isa_dma_malloc(device_t dev,void ** buf,bus_addr_t * bus_addr,bus_size_t size)229 atppc_isa_dma_malloc(device_t dev, void **buf, bus_addr_t *bus_addr,
230 bus_size_t size)
231 {
232 struct atppc_isa_softc *sc = device_private(dev);
233
234 return atppc_isadma_malloc(sc->sc_ic, sc->sc_drq, buf, bus_addr, size);
235 }
236
237 /* Free memory allocated by atppc_isa_dma_malloc() */
238 static void
atppc_isa_dma_free(device_t dev,void ** buf,bus_addr_t * bus_addr,bus_size_t size)239 atppc_isa_dma_free(device_t dev, void **buf, bus_addr_t *bus_addr,
240 bus_size_t size)
241 {
242 struct atppc_isa_softc *sc = device_private(dev);
243
244 return atppc_isadma_free(sc->sc_ic, sc->sc_drq, buf, bus_addr, size);
245 }
246