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1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (c) 2004 Joerg Wunsch
5  *
6  * derived from sys/i386/isa/pcf.c which is:
7  *
8  * Copyright (c) 1998 Nicolas Souchu, Marc Bouget
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without
12  * modification, are permitted provided that the following conditions
13  * are met:
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright
17  *    notice, this list of conditions and the following disclaimer in the
18  *    documentation and/or other materials provided with the distribution.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
34
35 /*
36  * Device specific driver for the SUNW,envctrl device found on some
37  * UltraSPARC Sun systems.  This device is a Philips PCF8584 sitting
38  * on the Ebus2.
39  */
40
41 #include <sys/param.h>
42 #include <sys/bus.h>
43 #include <sys/conf.h>
44 #include <sys/kernel.h>
45 #include <sys/lock.h>
46 #include <sys/malloc.h>
47 #include <sys/module.h>
48 #include <sys/mutex.h>
49 #include <sys/resource.h>
50 #include <sys/systm.h>
51 #include <sys/uio.h>
52
53 #include <dev/ofw/ofw_bus.h>
54
55 #include <machine/bus.h>
56 #include <machine/resource.h>
57
58 #include <sys/rman.h>
59
60 #include <dev/iicbus/iicbus.h>
61 #include <dev/iicbus/iiconf.h>
62 #include <dev/pcf/pcfvar.h>
63 #include "iicbus_if.h"
64
65 #undef PCF_DEFAULT_ADDR
66 #define PCF_DEFAULT_ADDR        0x55 /* SUNW,pcf default */
67
68 static int envctrl_probe(device_t);
69 static int envctrl_attach(device_t);
70 static int envctrl_detach(device_t);
71
72 static device_method_t envctrl_methods[] = {
73         /* device interface */
74         DEVMETHOD(device_probe,         envctrl_probe),
75         DEVMETHOD(device_attach,        envctrl_attach),
76         DEVMETHOD(device_detach,        envctrl_detach),
77
78         /* iicbus interface */
79         DEVMETHOD(iicbus_callback,      iicbus_null_callback),
80         DEVMETHOD(iicbus_repeated_start, pcf_repeated_start),
81         DEVMETHOD(iicbus_start,         pcf_start),
82         DEVMETHOD(iicbus_stop,          pcf_stop),
83         DEVMETHOD(iicbus_write,         pcf_write),
84         DEVMETHOD(iicbus_read,          pcf_read),
85         DEVMETHOD(iicbus_reset,         pcf_rst_card),
86         { 0, 0 }
87 };
88
89 static devclass_t envctrl_devclass;
90
91 static driver_t envctrl_driver = {
92         "envctrl",
93         envctrl_methods,
94         sizeof(struct pcf_softc),
95 };
96
97 static int
98 envctrl_probe(device_t dev)
99 {
100
101         if (strcmp("SUNW,envctrl", ofw_bus_get_name(dev)) == 0) {
102                 device_set_desc(dev, "EBus SUNW,envctrl");
103                 return (0);
104         }
105         return (ENXIO);
106 }
107
108 static int
109 envctrl_attach(device_t dev)
110 {
111         struct pcf_softc *sc;
112         int rv = ENXIO;
113
114         sc = DEVTOSOFTC(dev);
115         mtx_init(&sc->pcf_lock, device_get_nameunit(dev), "pcf", MTX_DEF);
116
117         /* IO port is mandatory */
118         sc->res_ioport = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
119                                                 &sc->rid_ioport, RF_ACTIVE);
120         if (sc->res_ioport == 0) {
121                 device_printf(dev, "cannot reserve I/O port range\n");
122                 goto error;
123         }
124
125         sc->pcf_flags = device_get_flags(dev);
126
127         if (!(sc->pcf_flags & IIC_POLLED)) {
128                 sc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &sc->rid_irq,
129                                                      RF_ACTIVE);
130                 if (sc->res_irq == 0) {
131                         device_printf(dev, "can't reserve irq, polled mode.\n");
132                         sc->pcf_flags |= IIC_POLLED;
133                 }
134         }
135
136         /* reset the chip */
137         pcf_rst_card(dev, IIC_FASTEST, PCF_DEFAULT_ADDR, NULL);
138
139         rv = bus_setup_intr(dev, sc->res_irq,
140                             INTR_TYPE_NET | INTR_MPSAFE /* | INTR_ENTROPY */,
141                             NULL, pcf_intr, sc, &sc->intr_cookie);
142         if (rv) {
143                 device_printf(dev, "could not setup IRQ\n");
144                 goto error;
145         }
146
147         if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL)
148                 device_printf(dev, "could not allocate iicbus instance\n");
149
150         /* probe and attach the iicbus */
151         bus_generic_attach(dev);
152
153         return (0);
154
155 error:
156         if (sc->res_irq != 0) {
157                 bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq,
158                                      sc->res_irq);
159         }
160         if (sc->res_ioport != 0) {
161                 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid_ioport,
162                                      sc->res_ioport);
163         }
164         mtx_destroy(&sc->pcf_lock);
165         return (rv);
166 }
167
168 static int
169 envctrl_detach(device_t dev)
170 {
171         struct pcf_softc *sc;
172         int rv;
173
174         sc = DEVTOSOFTC(dev);
175
176         if ((rv = bus_generic_detach(dev)) != 0)
177                 return (rv);
178
179         if ((rv = device_delete_child(dev, sc->iicbus)) != 0)
180                 return (rv);
181
182         if (sc->res_irq != 0) {
183                 bus_teardown_intr(dev, sc->res_irq, sc->intr_cookie);
184                 bus_release_resource(dev, SYS_RES_IRQ, sc->rid_irq, sc->res_irq);
185         }
186
187         bus_release_resource(dev, SYS_RES_MEMORY, sc->rid_ioport, sc->res_ioport);
188         mtx_destroy(&sc->pcf_lock);
189
190         return (0);
191 }
192
193 DRIVER_MODULE(envctrl, ebus, envctrl_driver, envctrl_devclass, 0, 0);
194 DRIVER_MODULE(iicbus, envctrl, iicbus_driver, iicbus_devclass, 0, 0);