2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 /* CPU configuration module for Allwinner A20 */
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/systm.h>
37 #include <sys/kernel.h>
38 #include <sys/module.h>
39 #include <sys/malloc.h>
41 #include <sys/timeet.h>
42 #include <sys/timetc.h>
43 #include <sys/watchdog.h>
44 #include <machine/bus.h>
45 #include <machine/cpu.h>
46 #include <machine/intr.h>
48 #include <dev/ofw/openfirm.h>
49 #include <dev/ofw/ofw_bus.h>
50 #include <dev/ofw/ofw_bus_subr.h>
52 #include <machine/bus.h>
54 #include "a20_cpu_cfg.h"
56 struct a20_cpu_cfg_softc {
59 bus_space_handle_t bsh;
62 static struct a20_cpu_cfg_softc *a20_cpu_cfg_sc = NULL;
64 #define cpu_cfg_read_4(sc, reg) \
65 bus_space_read_4((sc)->bst, (sc)->bsh, (reg))
66 #define cpu_cfg_write_4(sc, reg, val) \
67 bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val))
70 a20_cpu_cfg_probe(device_t dev)
73 if (!ofw_bus_status_okay(dev))
76 if (ofw_bus_is_compatible(dev, "allwinner,sun7i-cpu-cfg")) {
77 device_set_desc(dev, "A20 CPU Configuration Module");
78 return(BUS_PROBE_DEFAULT);
85 a20_cpu_cfg_attach(device_t dev)
87 struct a20_cpu_cfg_softc *sc = device_get_softc(dev);
93 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
95 device_printf(dev, "could not allocate resource\n");
99 sc->bst = rman_get_bustag(sc->res);
100 sc->bsh = rman_get_bushandle(sc->res);
107 static device_method_t a20_cpu_cfg_methods[] = {
108 DEVMETHOD(device_probe, a20_cpu_cfg_probe),
109 DEVMETHOD(device_attach, a20_cpu_cfg_attach),
113 static driver_t a20_cpu_cfg_driver = {
116 sizeof(struct a20_cpu_cfg_softc),
119 EARLY_DRIVER_MODULE(a20_cpu_cfg, simplebus, a20_cpu_cfg_driver, 0, 0,
120 BUS_PASS_CPU + BUS_PASS_ORDER_FIRST);
123 a20_read_counter64(void)
127 /* Latch counter, wait for it to be ready to read. */
128 cpu_cfg_write_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG, CNT64_RL_EN);
129 while (cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG) & CNT64_RL_EN)
132 hi = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_HIGH_REG);
133 lo = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_LOW_REG);
135 return (((uint64_t)hi << 32) | lo);