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: stable/12/sys/arm/samsung/exynos/exynos5_pmu.c 269703 2014-08-08 06:30:17Z nwhitehorn $");
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/ofw/openfirm.h>
46 #include <dev/ofw/ofw_bus.h>
47 #include <dev/ofw/ofw_bus_subr.h>
48
49 #include <machine/bus.h>
50 #include <machine/cpu.h>
51 #include <machine/intr.h>
52
53 #include <arm/samsung/exynos/exynos5_common.h>
54 #include <arm/samsung/exynos/exynos5_pmu.h>
55
56 #define EXYNOS5250 1
57 #define EXYNOS5420 2
58
59 /* PWR control */
60 #define EXYNOS5_PWR_USBHOST_PHY 0x708
61 #define EXYNOS5_USBDRD_PHY_CTRL 0x704
62 #define EXYNOS5420_USBDRD1_PHY_CTRL 0x708
63
64 #define PHY_POWER_ON 1
65 #define PHY_POWER_OFF 0
66
67 struct pmu_softc {
68 struct resource *res[1];
69 bus_space_tag_t bst;
70 bus_space_handle_t bsh;
71 device_t dev;
72 int model;
73 };
74
75 struct pmu_softc *pmu_sc;
76
77 static struct ofw_compat_data compat_data[] = {
78 {"samsung,exynos5420-pmu", EXYNOS5420},
79 {"samsung,exynos5250-pmu", EXYNOS5250},
80 {NULL, 0}
81 };
82
83 static struct resource_spec pmu_spec[] = {
84 { SYS_RES_MEMORY, 0, RF_ACTIVE },
85 { -1, 0 }
86 };
87
88 static int
pmu_probe(device_t dev)89 pmu_probe(device_t dev)
90 {
91
92 if (!ofw_bus_status_okay(dev))
93 return (ENXIO);
94
95 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data != 0) {
96 device_set_desc(dev, "Samsung Exynos 5 Power Management Unit");
97 return (BUS_PROBE_DEFAULT);
98 }
99
100 return (ENXIO);
101 }
102
103 int
usb2_phy_power_on(void)104 usb2_phy_power_on(void)
105 {
106 struct pmu_softc *sc;
107
108 sc = pmu_sc;
109 if (sc == NULL)
110 return (-1);
111
112 /* EHCI */
113 WRITE4(sc, EXYNOS5_PWR_USBHOST_PHY, PHY_POWER_ON);
114
115 return (0);
116 }
117
118 int
usbdrd_phy_power_on(void)119 usbdrd_phy_power_on(void)
120 {
121 struct pmu_softc *sc;
122
123 sc = pmu_sc;
124 if (sc == NULL)
125 return (-1);
126
127 /*
128 * First XHCI controller (left-side USB port on chromebook2)
129 */
130 WRITE4(sc, EXYNOS5_USBDRD_PHY_CTRL, PHY_POWER_ON);
131
132 /*
133 * Second XHCI controller (right-side USB port on chrombook2)
134 * Only available on 5420.
135 */
136 if (sc->model == EXYNOS5420)
137 WRITE4(sc, EXYNOS5420_USBDRD1_PHY_CTRL, PHY_POWER_ON);
138
139 return (0);
140 }
141
142 static int
pmu_attach(device_t dev)143 pmu_attach(device_t dev)
144 {
145 struct pmu_softc *sc;
146
147 sc = device_get_softc(dev);
148 sc->dev = dev;
149 sc->model = ofw_bus_search_compatible(dev, compat_data)->ocd_data;
150
151 if (bus_alloc_resources(dev, pmu_spec, sc->res)) {
152 device_printf(dev, "could not allocate resources\n");
153 return (ENXIO);
154 }
155
156 /* Memory interface */
157 sc->bst = rman_get_bustag(sc->res[0]);
158 sc->bsh = rman_get_bushandle(sc->res[0]);
159
160 pmu_sc = sc;
161
162 return (0);
163 }
164
165 static device_method_t pmu_methods[] = {
166 DEVMETHOD(device_probe, pmu_probe),
167 DEVMETHOD(device_attach, pmu_attach),
168 { 0, 0 }
169 };
170
171 static driver_t pmu_driver = {
172 "pmu",
173 pmu_methods,
174 sizeof(struct pmu_softc),
175 };
176
177 static devclass_t pmu_devclass;
178
179 DRIVER_MODULE(pmu, simplebus, pmu_driver, pmu_devclass, 0, 0);
180