1 /* $NetBSD: i80312_i2c.c,v 1.7 2019/12/22 23:23:30 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 2003 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
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 * 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.
24 *
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.
36 */
37
38 /*
39 * Intel i80321 I/O Processor I2C Controller Unit support.
40 */
41
42 #include <sys/cdefs.h>
43 __KERNEL_RCSID(0, "$NetBSD: i80312_i2c.c,v 1.7 2019/12/22 23:23:30 thorpej Exp $");
44
45 #include <sys/param.h>
46 #include <sys/mutex.h>
47 #include <sys/systm.h>
48 #include <sys/device.h>
49 #include <sys/kernel.h>
50
51 #include <sys/bus.h>
52 #include <machine/intr.h>
53
54 #include <arm/xscale/i80312var.h>
55
56 #include <dev/i2c/i2cvar.h>
57
58 #include <arm/xscale/iopi2cvar.h>
59 #include <arm/xscale/iopi2creg.h>
60
61 static int
iic312_match(device_t parent,cfdata_t cf,void * aux)62 iic312_match(device_t parent, cfdata_t cf, void *aux)
63 {
64 struct iopxs_attach_args *ia = aux;
65
66 if (strcmp(cf->cf_name, ia->ia_name) == 0)
67 return (1);
68
69 return (0);
70 }
71
72 static void
iic312_attach(device_t parent,device_t self,void * aux)73 iic312_attach(device_t parent, device_t self, void *aux)
74 {
75 struct iopiic_softc *sc = device_private(self);
76 struct iopxs_attach_args *ia = aux;
77 int error;
78
79 aprint_naive(": I2C controller\n");
80 aprint_normal(": I2C controller\n");
81
82 sc->sc_dev = self;
83 sc->sc_st = ia->ia_st;
84 if ((error = bus_space_subregion(sc->sc_st, ia->ia_sh,
85 ia->ia_offset, ia->ia_size,
86 &sc->sc_sh)) != 0) {
87 aprint_error_dev(self,
88 "unable to subregion registers, error = %d\n", error);
89 return;
90 }
91
92 /* XXX Reset the I2C unit? */
93
94 /* XXX We don't currently use interrupts. Fix this some day. */
95 #if 0
96 sc->sc_ih = i80321_intr_establish(ICU_INT_I2C, IPL_BIO,
97 iopiic_intr, sc);
98 if (sc->sc_ih == NULL) {
99 aprint_error_dev(self,
100 "unable to establish interrupt handler\n");
101 return;
102 }
103 #endif
104
105 /*
106 * Enable the I2C unit as a master running at 100.0 kHz (ICCR=0x1f4
107 * per p.12-8 of the i80312 developer's manual).
108 * No, we do not support slave mode.
109 */
110 sc->sc_icr = IIC_ICR_GCD | IIC_ICR_UE | IIC_ICR_SCLE;
111 bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, 0);
112 bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICCR, 0x1f4);
113 bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ISAR, 0);
114 bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, sc->sc_icr);
115
116 iopiic_attach(sc);
117 }
118
119 CFATTACH_DECL_NEW(iopiic, sizeof(struct iopiic_softc),
120 iic312_match, iic312_attach, NULL, NULL);
121