1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
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/malloc.h>
36 #include <sys/rman.h>
37 #include <sys/timeet.h>
38 #include <sys/timetc.h>
39 #include <sys/watchdog.h>
40 #include <machine/bus.h>
41 #include <machine/cpu.h>
42 #include <machine/frame.h>
43 #include <machine/intr.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 "a10_sramc.h"
50
51 #define SRAM_CTL1_CFG 0x04
52 #define CTL1_CFG_SRAMD_MAP_USB0 (1 << 0)
53
54 struct a10_sramc_softc {
55 struct resource *res;
56 bus_space_tag_t bst;
57 bus_space_handle_t bsh;
58 };
59
60 static struct a10_sramc_softc *a10_sramc_sc;
61
62 #define sramc_read_4(sc, reg) \
63 bus_space_read_4((sc)->bst, (sc)->bsh, (reg))
64 #define sramc_write_4(sc, reg, val) \
65 bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val))
66
67 static int
a10_sramc_probe(device_t dev)68 a10_sramc_probe(device_t dev)
69 {
70
71 if (ofw_bus_is_compatible(dev, "allwinner,sun4i-a10-sram-controller")) {
72 device_set_desc(dev, "Allwinner sramc module");
73 return (BUS_PROBE_DEFAULT);
74 }
75
76 return (ENXIO);
77 }
78
79 static int
a10_sramc_attach(device_t dev)80 a10_sramc_attach(device_t dev)
81 {
82 struct a10_sramc_softc *sc = device_get_softc(dev);
83 int rid = 0;
84
85 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
86 if (!sc->res) {
87 device_printf(dev, "could not allocate resource\n");
88 return (ENXIO);
89 }
90
91 sc->bst = rman_get_bustag(sc->res);
92 sc->bsh = rman_get_bushandle(sc->res);
93
94 a10_sramc_sc = sc;
95
96 return (0);
97 }
98
99 static device_method_t a10_sramc_methods[] = {
100 DEVMETHOD(device_probe, a10_sramc_probe),
101 DEVMETHOD(device_attach, a10_sramc_attach),
102 { 0, 0 }
103 };
104
105 static driver_t a10_sramc_driver = {
106 "a10_sramc",
107 a10_sramc_methods,
108 sizeof(struct a10_sramc_softc),
109 };
110
111 EARLY_DRIVER_MODULE(a10_sramc, simplebus, a10_sramc_driver, 0, 0,
112 BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_FIRST);
113
114 int
a10_map_to_emac(void)115 a10_map_to_emac(void)
116 {
117 struct a10_sramc_softc *sc = a10_sramc_sc;
118 uint32_t reg_value;
119
120 if (sc == NULL)
121 return (ENXIO);
122
123 /* Map SRAM to EMAC, set bit 2 and 4. */
124 reg_value = sramc_read_4(sc, SRAM_CTL1_CFG);
125 reg_value |= 0x5 << 2;
126 sramc_write_4(sc, SRAM_CTL1_CFG, reg_value);
127
128 return (0);
129 }
130
131 int
a10_map_to_otg(void)132 a10_map_to_otg(void)
133 {
134 struct a10_sramc_softc *sc = a10_sramc_sc;
135 uint32_t reg_value;
136
137 if (sc == NULL)
138 return (ENXIO);
139
140 /* Map SRAM to OTG */
141 reg_value = sramc_read_4(sc, SRAM_CTL1_CFG);
142 reg_value |= CTL1_CFG_SRAMD_MAP_USB0;
143 sramc_write_4(sc, SRAM_CTL1_CFG, reg_value);
144
145 return (0);
146 }
147