Sync usage with man page.
[netbsd-mini2440.git] / sys / arch / acorn26 / ioc / iociic.c
blobbc2aea386eedc91578e7ecca842e0dfe86d71183
1 /* $NetBSD: iociic.c,v 1.7 2009/01/07 22:58:38 bjh21 Exp $ */
3 /*
4 * Copyright (c) 2003 Wasabi Systems, Inc.
5 * All rights reserved.
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
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 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
38 #include <sys/param.h>
39 #include <sys/device.h>
40 #include <sys/kernel.h>
41 #include <sys/systm.h>
42 #include <sys/mutex.h>
44 #include <machine/bus.h>
45 #include <machine/cpu.h>
47 #include <acorn26/iobus/iocreg.h>
48 #include <acorn26/iobus/iocvar.h>
50 #include <dev/i2c/i2cvar.h>
51 #include <dev/i2c/i2c_bitbang.h>
53 #include <acorn26/ioc/iociicvar.h>
55 struct iociic_softc {
56 device_t sc_dev;
57 bus_space_tag_t sc_st;
58 bus_space_handle_t sc_sh;
60 struct i2c_controller sc_i2c;
61 kmutex_t sc_buslock;
64 * The SDA pin is open-drain, so we make it an input by
65 * writing a 1 to it.
67 uint32_t sc_ioc_ctl;
70 static struct iociic_softc *the_iociic;
72 static int iociic_acquire_bus(void *, int);
73 static void iociic_release_bus(void *, int);
75 static int iociic_send_start(void *, int);
76 static int iociic_send_stop(void *, int);
77 static int iociic_initiate_xfer(void *, i2c_addr_t, int);
78 static int iociic_read_byte(void *, uint8_t *, int);
79 static int iociic_write_byte(void *, uint8_t, int);
81 static void
82 iociic_bb_set_bits(void *cookie, uint32_t bits)
84 struct iociic_softc *sc = cookie;
86 ioc_ctl_write(device_parent(sc->sc_dev), sc->sc_ioc_ctl | bits,
87 IOC_CTL_SDA | IOC_CTL_SCL);
90 static void
91 iociic_bb_set_dir(void *cookie, uint32_t bits)
93 struct iociic_softc *sc = cookie;
95 sc->sc_ioc_ctl = bits;
98 static uint32_t
99 iociic_bb_read_bits(void *cookie)
101 struct iociic_softc *sc = cookie;
103 return ioc_ctl_read(device_parent(sc->sc_dev));
106 static const struct i2c_bitbang_ops iociic_bbops = {
107 iociic_bb_set_bits,
108 iociic_bb_set_dir,
109 iociic_bb_read_bits,
111 IOC_CTL_SDA, /* SDA */
112 IOC_CTL_SCL, /* SCL */
113 0, /* SDA is output */
114 IOC_CTL_SDA, /* SDA is input */
118 static int
119 iociic_match(device_t parent, cfdata_t cf, void *aux)
122 return 1;
125 static void
126 iociic_attach(device_t parent, device_t self, void *aux)
128 struct iociic_softc *sc = device_private(self);
129 struct i2cbus_attach_args iba;
131 sc->sc_dev = self;
132 if (the_iociic == NULL)
133 the_iociic = sc;
135 aprint_normal("\n");
137 mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE);
139 sc->sc_i2c.ic_cookie = sc;
140 sc->sc_i2c.ic_acquire_bus = iociic_acquire_bus;
141 sc->sc_i2c.ic_release_bus = iociic_release_bus;
142 sc->sc_i2c.ic_send_start = iociic_send_start;
143 sc->sc_i2c.ic_send_stop = iociic_send_stop;
144 sc->sc_i2c.ic_initiate_xfer = iociic_initiate_xfer;
145 sc->sc_i2c.ic_read_byte = iociic_read_byte;
146 sc->sc_i2c.ic_write_byte = iociic_write_byte;
148 iba.iba_tag = &sc->sc_i2c;
149 (void) config_found_ia(self, "i2cbus", &iba, iicbus_print);
152 CFATTACH_DECL_NEW(iociic, sizeof(struct iociic_softc),
153 iociic_match, iociic_attach, NULL, NULL);
155 i2c_tag_t
156 iociic_bootstrap_cookie(void)
159 if (the_iociic == NULL)
160 return NULL;
161 return &the_iociic->sc_i2c;
164 static int
165 iociic_acquire_bus(void *cookie, int flags)
167 struct iociic_softc *sc = cookie;
169 /* XXX What should we do for the polling case? */
170 if (flags & I2C_F_POLL)
171 return (0);
173 mutex_enter(&sc->sc_buslock);
174 return 0;
177 static void
178 iociic_release_bus(void *cookie, int flags)
180 struct iociic_softc *sc = cookie;
182 /* XXX See above. */
183 if (flags & I2C_F_POLL)
184 return;
186 mutex_exit(&sc->sc_buslock);
189 static int
190 iociic_send_start(void *cookie, int flags)
193 return i2c_bitbang_send_start(cookie, flags, &iociic_bbops);
196 static int
197 iociic_send_stop(void *cookie, int flags)
200 return (i2c_bitbang_send_stop(cookie, flags, &iociic_bbops));
203 static int
204 iociic_initiate_xfer(void *cookie, i2c_addr_t addr, int flags)
207 return i2c_bitbang_initiate_xfer(cookie, addr, flags, &iociic_bbops);
210 static int
211 iociic_read_byte(void *cookie, uint8_t *bytep, int flags)
214 return i2c_bitbang_read_byte(cookie, bytep, flags, &iociic_bbops);
217 static int
218 iociic_write_byte(void *cookie, uint8_t byte, int flags)
221 return i2c_bitbang_write_byte(cookie, byte, flags, &iociic_bbops);