fdt_powerpc.c revision 265959 
1/*-
2 * Copyright (c) 2009-2010 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Semihalf under sponsorship from
6 * the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD: stable/10/sys/dev/fdt/fdt_powerpc.c 265959 2014-05-13 17:12:07Z ian $");
32
33#include <sys/param.h>
34#include <sys/systm.h>
35#include <sys/kernel.h>
36#include <sys/module.h>
37#include <sys/bus.h>
38
39#include <machine/intr_machdep.h>
40
41#include <dev/ofw/ofw_bus.h>
42#include <dev/ofw/ofw_bus_subr.h>
43#include <dev/ofw/openfirm.h>
44
45#include "ofw_bus_if.h"
46#include "fdt_common.h"
47
48static void
49fdt_fixup_busfreq(phandle_t root)
50{
51	phandle_t sb, cpus, child;
52	pcell_t freq;
53
54	/*
55	 * Do a strict check so as to skip non-SOC nodes, which also claim
56	 * simple-bus compatibility such as eLBC etc.
57	 */
58	if ((sb = fdt_find_compatible(root, "simple-bus", 1)) == 0)
59		return;
60
61	/*
62	 * This fixup uses /cpus/ bus-frequency prop value to set simple-bus
63	 * bus-frequency property.
64	 */
65	if ((cpus = OF_finddevice("/cpus")) == -1)
66		return;
67
68	if ((child = OF_child(cpus)) == 0)
69		return;
70
71	if (OF_getprop(child, "bus-frequency", (void *)&freq,
72	    sizeof(freq)) <= 0)
73		return;
74
75	OF_setprop(sb, "bus-frequency", (void *)&freq, sizeof(freq));
76}
77
78struct fdt_fixup_entry fdt_fixup_table[] = {
79	{ "fsl,MPC8572DS", &fdt_fixup_busfreq },
80	{ "MPC8555CDS", &fdt_fixup_busfreq },
81	{ NULL, NULL }
82};
83
84static int
85fdt_pic_decode_iic(phandle_t node, pcell_t *intr, int *interrupt, int *trig,
86    int *pol)
87{
88	if (!fdt_is_compatible(node, "chrp,iic"))
89		return (ENXIO);
90
91	*interrupt = intr[0];
92
93	switch (intr[1]) {
94	case 0:
95		/* Active L level */
96		*trig = INTR_TRIGGER_LEVEL;
97		*pol = INTR_POLARITY_LOW;
98		break;
99	case 1:
100		/* Active H level */
101		*trig = INTR_TRIGGER_LEVEL;
102		*pol = INTR_POLARITY_HIGH;
103		break;
104	case 2:
105		/* H to L edge */
106		*trig = INTR_TRIGGER_EDGE;
107		*pol = INTR_POLARITY_LOW;
108		break;
109	case 3:
110		/* L to H edge */
111		*trig = INTR_TRIGGER_EDGE;
112		*pol = INTR_POLARITY_HIGH;
113		break;
114	default:
115		*trig = INTR_TRIGGER_CONFORM;
116		*pol = INTR_POLARITY_CONFORM;
117	}
118	return (0);
119}
120
121static int
122fdt_pic_decode_openpic(phandle_t node, pcell_t *intr, int *interrupt,
123    int *trig, int *pol)
124{
125
126	if (!fdt_is_compatible(node, "chrp,open-pic") &&
127	    !fdt_is_type(node, "open-pic"))
128		return (ENXIO);
129
130	/*
131	 * XXX The interrupt number read out from the MPC85XX device tree is
132	 * already offset by 16 to reflect the 'internal' IRQ range shift on
133	 * the OpenPIC.
134	 */
135	*interrupt = intr[0];
136
137	switch (intr[1]) {
138	case 0:
139		/* L to H edge */
140		*trig = INTR_TRIGGER_EDGE;
141		*pol = INTR_POLARITY_HIGH;
142		break;
143	case 1:
144		/* Active L level */
145		*trig = INTR_TRIGGER_LEVEL;
146		*pol = INTR_POLARITY_LOW;
147		break;
148	case 2:
149		/* Active H level */
150		*trig = INTR_TRIGGER_LEVEL;
151		*pol = INTR_POLARITY_HIGH;
152		break;
153	case 3:
154		/* H to L edge */
155		*trig = INTR_TRIGGER_EDGE;
156		*pol = INTR_POLARITY_LOW;
157		break;
158	default:
159		*trig = INTR_TRIGGER_CONFORM;
160		*pol = INTR_POLARITY_CONFORM;
161	}
162	return (0);
163}
164
165fdt_pic_decode_t fdt_pic_table[] = {
166	&fdt_pic_decode_iic,
167	&fdt_pic_decode_openpic,
168	NULL
169};
170