1 /* $NetBSD: gttwsi.c,v 1.12 2020/01/12 17:48:42 thorpej Exp $ */
2 /*
3 * Copyright (c) 2008 Eiji Kawauchi.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed for the NetBSD Project by
17 * Eiji Kawauchi.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32 /*
33 * Copyright (c) 2005 Brocade Communcations, inc.
34 * All rights reserved.
35 *
36 * Written by Matt Thomas for Brocade Communcations, Inc.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. The name of Brocade Communications, Inc. may not be used to endorse
47 * or promote products derived from this software without specific prior
48 * written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY BROCADE COMMUNICATIONS, INC. ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL EITHER BROCADE COMMUNICATIONS, INC. BE
54 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
55 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
56 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
57 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
58 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
59 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
60 * OF THE POSSIBILITY OF SUCH DAMAGE.
61 */
62 //#define TWSI_DEBUG
63
64 /*
65 * Marvell Two-Wire Serial Interface (aka I2C) master driver
66 */
67
68 #include <sys/cdefs.h>
69 __KERNEL_RCSID(0, "$NetBSD: gttwsi.c,v 1.12 2020/01/12 17:48:42 thorpej Exp $");
70 #include "locators.h"
71
72 #include <sys/param.h>
73 #include <sys/bus.h>
74 #include <sys/condvar.h>
75 #include <sys/device.h>
76 #include <sys/errno.h>
77 #include <sys/kernel.h>
78 #include <sys/mutex.h>
79 #include <sys/systm.h>
80
81 #include <machine/cpu.h>
82 #include <machine/param.h>
83
84 #include <dev/i2c/i2cvar.h>
85 #include <dev/i2c/gttwsireg.h>
86 #include <dev/i2c/gttwsivar.h>
87
88 #include <dev/marvell/marvellvar.h>
89
90 static const bus_size_t marvell_twsi_regmap[GTTWSI_NREGS] = {
91 [TWSI_SLAVEADDR] = TWSI_MARVELL_SLAVEADDR,
92 [TWSI_EXTEND_SLAVEADDR] = TWSI_MARVELL_EXTEND_SLAVEADDR,
93 [TWSI_DATA] = TWSI_MARVELL_DATA,
94 [TWSI_CONTROL] = TWSI_MARVELL_CONTROL,
95 [TWSI_STATUS] = TWSI_MARVELL_STATUS,
96 [TWSI_BAUDRATE] = TWSI_MARVELL_BAUDRATE,
97 [TWSI_SOFTRESET] = TWSI_MARVELL_SOFTRESET,
98 };
99
100 static int gttwsi_match(device_t, cfdata_t, void *);
101 static void gttwsi_attach(device_t, device_t, void *);
102
103 CFATTACH_DECL_NEW(gttwsi_gt, sizeof(struct gttwsi_softc),
104 gttwsi_match, gttwsi_attach, NULL, NULL);
105 CFATTACH_DECL_NEW(gttwsi_mbus, sizeof(struct gttwsi_softc),
106 gttwsi_match, gttwsi_attach, NULL, NULL);
107
108 /* ARGSUSED */
109 static int
gttwsi_match(device_t parent,cfdata_t match,void * aux)110 gttwsi_match(device_t parent, cfdata_t match, void *aux)
111 {
112 struct marvell_attach_args *mva = aux;
113
114 if (strcmp(mva->mva_name, match->cf_name) != 0)
115 return 0;
116 if (mva->mva_offset == MVA_OFFSET_DEFAULT ||
117 mva->mva_irq == MVA_IRQ_DEFAULT)
118 return 0;
119
120 mva->mva_size = GTTWSI_SIZE;
121 return 1;
122 }
123
124 /* ARGSUSED */
125 static void
gttwsi_attach(device_t parent,device_t self,void * args)126 gttwsi_attach(device_t parent, device_t self, void *args)
127 {
128 struct marvell_attach_args *mva = args;
129 bus_space_handle_t ioh;
130
131 if (bus_space_subregion(mva->mva_iot, mva->mva_ioh, mva->mva_offset,
132 mva->mva_size, &ioh)) {
133 aprint_error(": cannot map registers\n");
134 return;
135 }
136
137 gttwsi_attach_subr(self, mva->mva_iot, ioh, marvell_twsi_regmap);
138
139 marvell_intr_establish(mva->mva_irq, IPL_BIO, gttwsi_intr,
140 device_private(self));
141
142 gttwsi_config_children(self);
143 }
144