1 /* $NetBSD: i80321_i2c.c,v 1.6 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: i80321_i2c.c,v 1.6 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/i80321reg.h>
55 #include <arm/xscale/i80321var.h>
56
57 #include <dev/i2c/i2cvar.h>
58
59 #include <arm/xscale/iopi2creg.h>
60 #include <arm/xscale/iopi2cvar.h>
61
62 static int
iic321_match(device_t parent,cfdata_t cf,void * aux)63 iic321_match(device_t parent, cfdata_t cf, void *aux)
64 {
65 struct iopxs_attach_args *ia = aux;
66
67 if (strcmp(cf->cf_name, ia->ia_name) == 0)
68 return (1);
69
70 return (0);
71 }
72
73 static void
iic321_attach(device_t parent,device_t self,void * aux)74 iic321_attach(device_t parent, device_t self, void *aux)
75 {
76 struct iopiic_softc *sc = device_private(self);
77 struct iopxs_attach_args *ia = aux;
78 int error;
79 uint8_t gpio_bits;
80
81 aprint_naive(": I2C controller\n");
82 aprint_normal(": I2C controller\n");
83
84 sc->sc_dev = self;
85 sc->sc_st = ia->ia_st;
86 if ((error = bus_space_subregion(sc->sc_st, ia->ia_sh,
87 ia->ia_offset, ia->ia_size,
88 &sc->sc_sh)) != 0) {
89 aprint_error_dev(self,
90 "unable to subregion registers, error = %d\n", error);
91 return;
92 }
93
94 gpio_bits = (ia->ia_offset == VERDE_I2C_BASE0) ?
95 (1U << 7) | (1U << 6) : (1U << 5) | (1U << 4);
96 i80321_gpio_set_val(gpio_bits, 0);
97 i80321_gpio_set_direction(gpio_bits, 0);
98
99 /* XXX Reset the I2C unit? */
100
101 /* XXX We don't currently use interrupts. Fix this some day. */
102 #if 0
103 sc->sc_ih = i80321_intr_establish((ia->ia_offset == VERDE_I2C_BASE0) ?
104 ICU_INT_I2C0 : ICU_INT_I2C1, IPL_BIO, iopiic_intr, sc);
105 if (sc->sc_ih == NULL) {
106 aprint_error_dev(self,
107 "unable to establish interrupt handler\n");
108 return;
109 }
110 #endif
111
112 /*
113 * Enable the I2C unit as a master.
114 * No, we do not support slave mode.
115 */
116 sc->sc_icr = IIC_ICR_GCD | IIC_ICR_UE | IIC_ICR_SCLE;
117 bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, 0);
118 bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ISAR, 0);
119 bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, sc->sc_icr);
120
121 iopiic_attach(sc);
122 }
123
124 CFATTACH_DECL_NEW(iopiic, sizeof(struct iopiic_softc),
125 iic321_match, iic321_attach, NULL, NULL);
126