1/*	$NetBSD: i80312_i2c.c,v 1.5 2011/07/01 20:32:51 dyoung 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 1.5 2011/07/01 20:32:51 dyoung 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
61static int
62iic312_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
72static void
73iic312_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	mutex_init(&sc->sc_buslock, MUTEX_DEFAULT, IPL_NONE);
95
96	/* XXX We don't currently use interrupts.  Fix this some day. */
97#if 0
98	sc->sc_ih = i80321_intr_establish(ICU_INT_I2C, IPL_BIO,
99					  iopiic_intr, sc);
100	if (sc->sc_ih == NULL) {
101		aprint_error_dev(self,
102		    "unable to establish interrupt handler\n");
103		return;
104	}
105#endif
106
107	/*
108	 * Enable the I2C unit as a master running at 100.0 kHz (ICCR=0x1f4
109	 * per p.12-8 of the i80312 developer's manual).
110	 * No, we do not support slave mode.
111	 */
112	sc->sc_icr = IIC_ICR_GCD | IIC_ICR_UE | IIC_ICR_SCLE;
113	bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, 0);
114	bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICCR, 0x1f4);
115	bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ISAR, 0);
116	bus_space_write_4(sc->sc_st, sc->sc_sh, IIC_ICR, sc->sc_icr);
117
118	iopiic_attach(sc);
119}
120
121CFATTACH_DECL_NEW(iopiic, sizeof(struct iopiic_softc),
122    iic312_match, iic312_attach, NULL, NULL);
123