FreeBSD/Linux Kernel Cross Reference
sys/dev/pcf/pcf_isa.c
1 /*-
2 * Copyright (c) 2004 Joerg Wunsch
3 *
4 * derived from sys/i386/isa/pcf.c which is:
5 *
6 * Copyright (c) 1998 Nicolas Souchu, Marc Bouget
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 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
32
33 /*
34 * Hardware driver for a Philips PCF8584 I2C bus controller sitting
35 * on a generic ISA bus.
36 */
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/bus.h>
41 #include <sys/kernel.h>
42 #include <sys/module.h>
43 #include <sys/resource.h>
44
45 #include <machine/bus.h>
46 #include <machine/resource.h>
47
48 #include <sys/rman.h>
49
50 #include <isa/isareg.h>
51 #include <isa/isavar.h>
52
53 #include <dev/iicbus/iiconf.h>
54 #include <dev/pcf/pcfvar.h>
55 #include "iicbus_if.h"
56
57 #define PCF_NAME "pcf"
58
59 static void pcf_isa_identify(driver_t *, device_t);
60 static int pcf_isa_probe(device_t);
61 static int pcf_isa_attach(device_t);
62 static int pcf_isa_detach(device_t);
63
64 static device_method_t pcf_isa_methods[] = {
65 /* device interface */
66 DEVMETHOD(device_identify, pcf_isa_identify),
67 DEVMETHOD(device_probe, pcf_isa_probe),
68 DEVMETHOD(device_attach, pcf_isa_attach),
69 DEVMETHOD(device_detach, pcf_isa_detach),
70
71 /* iicbus interface */
72 DEVMETHOD(iicbus_callback, iicbus_null_callback),
73 DEVMETHOD(iicbus_repeated_start, pcf_repeated_start),
74 DEVMETHOD(iicbus_start, pcf_start),
75 DEVMETHOD(iicbus_stop, pcf_stop),
76 DEVMETHOD(iicbus_write, pcf_write),
77 DEVMETHOD(iicbus_read, pcf_read),
78 DEVMETHOD(iicbus_reset, pcf_rst_card),
79 { 0, 0 }
80 };
81
82 static devclass_t pcf_isa_devclass;
83
84 static driver_t pcf_isa_driver = {
85 PCF_NAME,
86 pcf_isa_methods,
87 sizeof(struct pcf_softc),
88 };
89
90 static void
91 pcf_isa_identify(driver_t *driver, device_t parent)
92 {
93 BUS_ADD_CHILD(parent, ISA_ORDER_SPECULATIVE, PCF_NAME, 0);
94
95 return;
96 }
97
98 static int
99 pcf_isa_probe(device_t dev)
100 {
101 u_long start, count;
102 u_int rid = 0, port, error;
103
104 bus_get_resource(dev, SYS_RES_IOPORT, rid, &start, &count);
105
106 /* The port address must be explicitly specified */
107 if ((error = resource_int_value(PCF_NAME, 0, "port", &port) != 0))
108 return (error);
109
110 /* Probe is only successfull for the specified base io */
111 if (port != (u_int)start)
112 return (ENXIO);
113
114 device_set_desc(dev, "PCF8584 I2C bus controller");
115
116 return (0);
117 }
118
119 static int
120 pcf_isa_attach(device_t dev)
121 {
122 struct pcf_softc *sc;
123 int rv = ENXIO;
124
125 sc = DEVTOSOFTC(dev);
126 bzero(sc, sizeof(struct pcf_softc));
127
128 /* IO port is mandatory */
129 sc->res_ioport = bus_alloc_resource_any(dev, SYS_RES_IOPORT,
130 &sc->rid_ioport, RF_ACTIVE);
131 if (sc->res_ioport == 0) {
132 device_printf(dev, "cannot reserve I/O port range\n");
133 goto error;
134 }
135 sc->bt_ioport = rman_get_bustag(sc->res_ioport);
136 sc->bh_ioport = rman_get_bushandle(sc->res_ioport);
137
138 sc->pcf_flags = device_get_flags(dev);
139
140 if (!(sc->pcf_flags & IIC_POLLED)) {
141 sc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->rid_irq,
142 RF_ACTIVE);
143 if (sc->res_irq == 0) {
144 device_printf(dev, "can't reserve irq, polled mode.\n");
145 sc->pcf_flags |= IIC_POLLED;
146 }
147 }
148
149 /* reset the chip */
150 pcf_rst_card(dev, IIC_FASTEST, PCF_DEFAULT_ADDR, NULL);
151
152 if (sc->res_irq) {
153 rv = BUS_SETUP_INTR(device_get_parent(dev), dev, sc->res_irq,
154 INTR_TYPE_NET /* | INTR_ENTROPY */,
155 pcf_intr, sc, &sc->intr_cookie);
156 if (rv) {
157 device_printf(dev, "could not setup IRQ\n");
158 goto error;
159 }
160 }
161
162 if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL)
163 device_printf(dev, "could not allocate iicbus instance\n");
164
165 /* probe and attach the iicbus */
166 bus_generic_attach(dev);
167
168 return (0);
169
170 error:
171 if (sc->res_irq != 0) {
172 bus_deactivate_resource(dev, SYS_RES_IRQ, sc->rid_irq,
173 sc->res_irq);
174 bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq,
175 sc->res_irq);
176 }
177 if (sc->res_ioport != 0) {
178 bus_deactivate_resource(dev, SYS_RES_IOPORT, sc->rid_ioport,
179 sc->res_ioport);
180 bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport,
181 sc->res_ioport);
182 }
183 return (rv);
184 }
185
186 static int
187 pcf_isa_detach(device_t dev)
188 {
189 struct pcf_softc *sc;
190 int rv;
191
192 sc = DEVTOSOFTC(dev);
193
194 if ((rv = bus_generic_detach(dev)) != 0)
195 return (rv);
196
197 if ((rv = device_delete_child(dev, sc->iicbus)) != 0)
198 return (rv);
199
200 if (sc->res_irq != 0) {
201 BUS_TEARDOWN_INTR(device_get_parent(dev), dev, sc->res_irq,
202 sc->intr_cookie);
203 bus_deactivate_resource(dev, SYS_RES_IRQ, sc->rid_irq, sc->res_irq);
204 bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq, sc->res_irq);
205 }
206
207 bus_deactivate_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, sc->res_ioport);
208 bus_release_resource(dev, SYS_RES_IOPORT, sc->rid_ioport, sc->res_ioport);
209
210 return (0);
211 }
212
213 DRIVER_MODULE(pcf_isa, isa, pcf_isa_driver, pcf_isa_devclass, 0, 0);
214 MODULE_DEPEND(pcf_isa, iicbus, PCF_MINVER, PCF_PREFVER, PCF_MAXVER);
215 MODULE_VERSION(pcf_isa, PCF_MODVER);
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