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 /* CPU configuration module for Allwinner A20 */
30
31 #include <sys/param.h>
32 #include <sys/systm.h>
33 #include <sys/bus.h>
34 #include <sys/kernel.h>
35 #include <sys/module.h>
36 #include <sys/malloc.h>
37 #include <sys/rman.h>
38 #include <sys/timeet.h>
39 #include <sys/timetc.h>
40 #include <sys/watchdog.h>
41 #include <machine/bus.h>
42 #include <machine/cpu.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 <machine/bus.h>
50
51 #include "a20_cpu_cfg.h"
52
53 struct a20_cpu_cfg_softc {
54 struct resource *res;
55 bus_space_tag_t bst;
56 bus_space_handle_t bsh;
57 };
58
59 static struct a20_cpu_cfg_softc *a20_cpu_cfg_sc = NULL;
60
61 #define cpu_cfg_read_4(sc, reg) \
62 bus_space_read_4((sc)->bst, (sc)->bsh, (reg))
63 #define cpu_cfg_write_4(sc, reg, val) \
64 bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val))
65
66 static int
a20_cpu_cfg_probe(device_t dev)67 a20_cpu_cfg_probe(device_t dev)
68 {
69
70 if (!ofw_bus_status_okay(dev))
71 return (ENXIO);
72
73 if (ofw_bus_is_compatible(dev, "allwinner,sun7i-cpu-cfg")) {
74 device_set_desc(dev, "A20 CPU Configuration Module");
75 return(BUS_PROBE_DEFAULT);
76 }
77
78 return (ENXIO);
79 }
80
81 static int
a20_cpu_cfg_attach(device_t dev)82 a20_cpu_cfg_attach(device_t dev)
83 {
84 struct a20_cpu_cfg_softc *sc = device_get_softc(dev);
85 int rid = 0;
86
87 if (a20_cpu_cfg_sc)
88 return (ENXIO);
89
90 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
91 if (!sc->res) {
92 device_printf(dev, "could not allocate resource\n");
93 return (ENXIO);
94 }
95
96 sc->bst = rman_get_bustag(sc->res);
97 sc->bsh = rman_get_bushandle(sc->res);
98
99 a20_cpu_cfg_sc = sc;
100
101 return (0);
102 }
103
104 static device_method_t a20_cpu_cfg_methods[] = {
105 DEVMETHOD(device_probe, a20_cpu_cfg_probe),
106 DEVMETHOD(device_attach, a20_cpu_cfg_attach),
107 { 0, 0 }
108 };
109
110 static driver_t a20_cpu_cfg_driver = {
111 "a20_cpu_cfg",
112 a20_cpu_cfg_methods,
113 sizeof(struct a20_cpu_cfg_softc),
114 };
115
116 EARLY_DRIVER_MODULE(a20_cpu_cfg, simplebus, a20_cpu_cfg_driver, 0, 0,
117 BUS_PASS_CPU + BUS_PASS_ORDER_FIRST);
118
119 uint64_t
a20_read_counter64(void)120 a20_read_counter64(void)
121 {
122 uint32_t lo, hi;
123
124 /* Latch counter, wait for it to be ready to read. */
125 cpu_cfg_write_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG, CNT64_RL_EN);
126 while (cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG) & CNT64_RL_EN)
127 continue;
128
129 hi = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_HIGH_REG);
130 lo = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_LOW_REG);
131
132 return (((uint64_t)hi << 32) | lo);
133 }
134