schppm.c revision 190103 
1/*-
2 * Copyright (c) 2008 Marius Strobl <marius@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/sparc64/sparc64/schppm.c 190103 2009-03-19 20:38:45Z marius $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33#include <sys/kernel.h>
34#include <sys/module.h>
35#include <sys/resource.h>
36#include <sys/rman.h>
37
38#include <dev/ofw/ofw_bus.h>
39
40#include <machine/bus.h>
41#include <machine/resource.h>
42
43#define	SCHPPM_NREG	1
44
45#define	SCHPPM_ESTAR	0
46
47#define	SCHPPM_ESTAR_CTRL		0x00
48#define	SCHPPM_ESTAR_CTRL_1		0x00000001
49#define	SCHPPM_ESTAR_CTRL_2		0x00000002
50#define	SCHPPM_ESTAR_CTRL_32		0x00000020
51#define	SCHPPM_ESTAR_CTRL_MASK						\
52	(SCHPPM_ESTAR_CTRL_1 | SCHPPM_ESTAR_CTRL_2 | SCHPPM_ESTAR_CTRL_32)
53
54static struct resource_spec schppm_res_spec[] = {
55	{ SYS_RES_MEMORY, SCHPPM_ESTAR, RF_ACTIVE },
56	{ -1, 0 }
57};
58
59struct schppm_softc {
60	struct resource		*sc_res[SCHPPM_NREG];
61};
62
63#define	SCHPPM_READ(sc, reg, off)					\
64	bus_read_8((sc)->sc_res[(reg)], (off))
65#define	SCHPPM_WRITE(sc, reg, off, val)					\
66	bus_write_8((sc)->sc_res[(reg)], (off), (val))
67
68static device_probe_t schppm_probe;
69static device_attach_t schppm_attach;
70
71static device_method_t schppm_methods[] = {
72	/* Device interface */
73	DEVMETHOD(device_probe,		schppm_probe),
74	DEVMETHOD(device_attach,	schppm_attach),
75
76	KOBJMETHOD_END
77};
78
79static devclass_t schppm_devclass;
80
81DEFINE_CLASS_0(schppm, schppm_driver, schppm_methods,
82    sizeof(struct schppm_softc));
83DRIVER_MODULE(schppm, nexus, schppm_driver, schppm_devclass, 0, 0);
84
85static int
86schppm_probe(device_t dev)
87{
88	const char* compat;
89
90	compat = ofw_bus_get_compat(dev);
91	if (compat != NULL && strcmp(ofw_bus_get_name(dev), "ppm") == 0 &&
92	    strcmp(compat, "gp2-ppm") == 0) {
93		device_set_desc(dev, "Schizo power management");
94		return (BUS_PROBE_DEFAULT);
95	}
96	return (ENXIO);
97}
98
99static int
100schppm_attach(device_t dev)
101{
102	struct schppm_softc *sc;
103
104	sc = device_get_softc(dev);
105	if (bus_alloc_resources(dev, schppm_res_spec, sc->sc_res)) {
106		device_printf(dev, "failed to allocate resources\n");
107		bus_release_resources(dev, schppm_res_spec, sc->sc_res);
108		return (ENXIO);
109	}
110
111	if (bootverbose) {
112		device_printf(dev, "running at ");
113		switch (SCHPPM_READ(sc, SCHPPM_ESTAR, SCHPPM_ESTAR_CTRL) &
114		    SCHPPM_ESTAR_CTRL_MASK) {
115		case SCHPPM_ESTAR_CTRL_1:
116			printf("full");
117			break;
118		case SCHPPM_ESTAR_CTRL_2:
119			printf("half");
120			break;
121		case SCHPPM_ESTAR_CTRL_32:
122			printf("1/32");
123			break;
124		default:
125			printf("unknown");
126			break;
127		}
128		printf(" speed\n");
129	}
130
131	return (0);
132}
133