exynos5_pmu.c revision 269369 
1/*-
2 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
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/*
28 * Exynos 5 Power Management Unit (PMU)
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: head/sys/arm/samsung/exynos/exynos5_pmu.c 269369 2014-08-01 06:20:25Z br $");
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/bus.h>
37#include <sys/kernel.h>
38#include <sys/module.h>
39#include <sys/malloc.h>
40#include <sys/rman.h>
41#include <sys/timeet.h>
42#include <sys/timetc.h>
43#include <sys/watchdog.h>
44
45#include <dev/fdt/fdt_common.h>
46#include <dev/ofw/openfirm.h>
47#include <dev/ofw/ofw_bus.h>
48#include <dev/ofw/ofw_bus_subr.h>
49
50#include <machine/bus.h>
51#include <machine/fdt.h>
52#include <machine/cpu.h>
53#include <machine/intr.h>
54
55#include <arm/samsung/exynos/exynos5_common.h>
56#include <arm/samsung/exynos/exynos5_pmu.h>
57
58#define	EXYNOS5250	1
59#define	EXYNOS5420	2
60
61/* PWR control */
62#define	EXYNOS5_PWR_USBHOST_PHY		0x708
63#define	EXYNOS5_USBDRD_PHY_CTRL		0x704
64#define	EXYNOS5420_USBDRD1_PHY_CTRL	0x708
65
66#define	PHY_POWER_ON			1
67#define	PHY_POWER_OFF			0
68
69struct pmu_softc {
70	struct resource		*res[1];
71	bus_space_tag_t		bst;
72	bus_space_handle_t	bsh;
73	device_t		dev;
74	int			model;
75};
76
77struct pmu_softc *pmu_sc;
78
79static struct ofw_compat_data compat_data[] = {
80	{"samsung,exynos5420-pmu",	EXYNOS5420},
81	{"samsung,exynos5250-pmu",	EXYNOS5250},
82	{NULL, 0}
83};
84
85static struct resource_spec pmu_spec[] = {
86	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },
87	{ -1, 0 }
88};
89
90static int
91pmu_probe(device_t dev)
92{
93
94	if (!ofw_bus_status_okay(dev))
95		return (ENXIO);
96
97	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) {
98		device_set_desc(dev, "Samsung Exynos 5 Power Management Unit");
99		return (BUS_PROBE_DEFAULT);
100	}
101
102	return (ENXIO);
103}
104
105int
106usb2_phy_power_on(void)
107{
108	struct pmu_softc *sc;
109
110	sc = pmu_sc;
111	if (sc == NULL)
112		return (-1);
113
114	/* EHCI */
115	WRITE4(sc, EXYNOS5_PWR_USBHOST_PHY, PHY_POWER_ON);
116
117	return (0);
118}
119
120int
121usbdrd_phy_power_on(void)
122{
123	struct pmu_softc *sc;
124
125	sc = pmu_sc;
126	if (sc == NULL)
127		return (-1);
128
129	/*
130	 * First XHCI controller (left-side USB port on chromebook2)
131	 */
132	WRITE4(sc, EXYNOS5_USBDRD_PHY_CTRL, PHY_POWER_ON);
133
134	/*
135	 * Second XHCI controller (right-side USB port on chrombook2)
136	 * Only available on 5420.
137	 */
138	if (sc->model == EXYNOS5420)
139		WRITE4(sc, EXYNOS5420_USBDRD1_PHY_CTRL, PHY_POWER_ON);
140
141	return (0);
142}
143
144static int
145pmu_attach(device_t dev)
146{
147	struct pmu_softc *sc;
148
149	sc = device_get_softc(dev);
150	sc->dev = dev;
151	sc->model = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
152
153	if (bus_alloc_resources(dev, pmu_spec, sc->res)) {
154		device_printf(dev, "could not allocate resources\n");
155		return (ENXIO);
156	}
157
158	/* Memory interface */
159	sc->bst = rman_get_bustag(sc->res[0]);
160	sc->bsh = rman_get_bushandle(sc->res[0]);
161
162	pmu_sc = sc;
163
164	return (0);
165}
166
167static device_method_t pmu_methods[] = {
168	DEVMETHOD(device_probe,		pmu_probe),
169	DEVMETHOD(device_attach,	pmu_attach),
170	{ 0, 0 }
171};
172
173static driver_t pmu_driver = {
174	"pmu",
175	pmu_methods,
176	sizeof(struct pmu_softc),
177};
178
179static devclass_t pmu_devclass;
180
181DRIVER_MODULE(pmu, simplebus, pmu_driver, pmu_devclass, 0, 0);
182