1 /*-
2 * Copyright (c) 2019 Emmanuel Vadot <manu@FreeBSD.org>
3 *
4 * Copyright (c) 2020 Oskar Holmlund <oskar.holmlund@ohdata.se>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
22 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27 /* Based on sys/arm/ti/ti_sysc.c */
28
29 #include <sys/param.h>
30 #include <sys/systm.h>
31 #include <sys/kernel.h>
32 #include <sys/module.h>
33 #include <sys/bus.h>
34 #include <sys/resource.h>
35 #include <sys/rman.h>
36 #include <sys/lock.h>
37 #include <sys/mutex.h>
38
39 #include <machine/bus.h>
40 #include <machine/resource.h>
41
42 #include <dev/fdt/simplebus.h>
43
44 #include <dev/ofw/openfirm.h>
45 #include <dev/ofw/ofw_bus.h>
46 #include <dev/ofw/ofw_bus_subr.h>
47
48 #include <arm/ti/ti_sysc.h>
49
50 #if 0
51 #define DPRINTF(dev, msg...) device_printf(dev, msg)
52 #else
53 #define DPRINTF(dev, msg...)
54 #endif
55
56 struct ti_am3359_cppi41_softc {
57 device_t dev;
58 struct syscon * syscon;
59 struct resource * res[4];
60 bus_space_tag_t bst;
61 bus_space_handle_t bsh;
62 struct mtx mtx;
63 };
64
65 static struct resource_spec ti_am3359_cppi41_res_spec[] = {
66 { SYS_RES_MEMORY, 0, RF_ACTIVE | RF_SHAREABLE },
67 { SYS_RES_MEMORY, 1, RF_ACTIVE | RF_SHAREABLE },
68 { SYS_RES_MEMORY, 2, RF_ACTIVE | RF_SHAREABLE },
69 { SYS_RES_MEMORY, 3, RF_ACTIVE | RF_SHAREABLE },
70 { -1, 0 }
71 };
72
73 /* Device */
74 static struct ofw_compat_data compat_data[] = {
75 { "ti,am3359-cppi41", 1 },
76 { NULL, 0 }
77 };
78
79 static int
ti_am3359_cppi41_write_4(device_t dev,bus_addr_t addr,uint32_t val)80 ti_am3359_cppi41_write_4(device_t dev, bus_addr_t addr, uint32_t val)
81 {
82 struct ti_am3359_cppi41_softc *sc;
83
84 sc = device_get_softc(dev);
85 DPRINTF(sc->dev, "offset=%lx write %x\n", addr, val);
86 mtx_lock(&sc->mtx);
87 bus_space_write_4(sc->bst, sc->bsh, addr, val);
88 mtx_unlock(&sc->mtx);
89 return (0);
90 }
91
92 static uint32_t
ti_am3359_cppi41_read_4(device_t dev,bus_addr_t addr)93 ti_am3359_cppi41_read_4(device_t dev, bus_addr_t addr)
94 {
95 struct ti_am3359_cppi41_softc *sc;
96 uint32_t val;
97
98 sc = device_get_softc(dev);
99
100 mtx_lock(&sc->mtx);
101 val = bus_space_read_4(sc->bst, sc->bsh, addr);
102 mtx_unlock(&sc->mtx);
103 DPRINTF(sc->dev, "offset=%lx Read %x\n", addr, val);
104 return (val);
105 }
106
107 /* device interface */
108 static int
ti_am3359_cppi41_probe(device_t dev)109 ti_am3359_cppi41_probe(device_t dev)
110 {
111 if (!ofw_bus_status_okay(dev))
112 return (ENXIO);
113
114 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
115 return (ENXIO);
116
117 device_set_desc(dev, "TI AM3359 CPPI 41");
118 return(BUS_PROBE_DEFAULT);
119 }
120
121 static int
ti_am3359_cppi41_attach(device_t dev)122 ti_am3359_cppi41_attach(device_t dev)
123 {
124 struct ti_am3359_cppi41_softc *sc;
125 uint32_t reg, reset_bit, timeout=10;
126 uint64_t sysc_address;
127 device_t parent;
128
129 sc = device_get_softc(dev);
130 sc->dev = dev;
131
132 if (bus_alloc_resources(dev, ti_am3359_cppi41_res_spec, sc->res)) {
133 device_printf(sc->dev, "Cant allocate resources\n");
134 return (ENXIO);
135 }
136
137 sc->dev = dev;
138 sc->bst = rman_get_bustag(sc->res[0]);
139 sc->bsh = rman_get_bushandle(sc->res[0]);
140
141 mtx_init(&sc->mtx, device_get_nameunit(sc->dev), NULL, MTX_DEF);
142
143 /* variant of am335x_usbss.c */
144 DPRINTF(dev, "-- RESET USB --\n");
145 parent = device_get_parent(dev);
146 reset_bit = ti_sysc_get_soft_reset_bit(parent);
147 if (reset_bit == 0) {
148 DPRINTF(dev, "Dont have reset bit\n");
149 return (0);
150 }
151 sysc_address = ti_sysc_get_sysc_address_offset_host(parent);
152 DPRINTF(dev, "sysc_address %x\n", sysc_address);
153 ti_am3359_cppi41_write_4(dev, sysc_address, reset_bit);
154 DELAY(100);
155 reg = ti_am3359_cppi41_read_4(dev, sysc_address);
156 if ((reg & reset_bit) && timeout--) {
157 DPRINTF(dev, "Reset still ongoing - wait a little bit longer\n");
158 DELAY(100);
159 reg = ti_am3359_cppi41_read_4(dev, sysc_address);
160 }
161 if (timeout == 0)
162 device_printf(dev, "USB Reset timeout\n");
163
164 return (0);
165 }
166
167 static device_method_t ti_am3359_cppi41_methods[] = {
168 DEVMETHOD(device_probe, ti_am3359_cppi41_probe),
169 DEVMETHOD(device_attach, ti_am3359_cppi41_attach),
170
171 DEVMETHOD_END
172 };
173
174 DEFINE_CLASS_1(ti_am3359_cppi41, ti_am3359_cppi41_driver,
175 ti_am3359_cppi41_methods,sizeof(struct ti_am3359_cppi41_softc),
176 simplebus_driver);
177
178 EARLY_DRIVER_MODULE(ti_am3359_cppi41, simplebus, ti_am3359_cppi41_driver, 0, 0,
179 BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
180 MODULE_VERSION(ti_am3359_cppi41, 1);
181 MODULE_DEPEND(ti_am3359_cppi41, ti_sysc, 1, 1, 1);
182