2 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@gmail.com>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 /* CPU configuration module for Allwinner A20 */
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/systm.h>
35 #include <sys/kernel.h>
36 #include <sys/module.h>
37 #include <sys/malloc.h>
39 #include <sys/timeet.h>
40 #include <sys/timetc.h>
41 #include <sys/watchdog.h>
42 #include <machine/bus.h>
43 #include <machine/cpu.h>
44 #include <machine/frame.h>
45 #include <machine/intr.h>
47 #include <dev/fdt/fdt_common.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>
53 #include <machine/fdt.h>
55 #include "a20_cpu_cfg.h"
57 struct a20_cpu_cfg_softc {
60 bus_space_handle_t bsh;
63 static struct a20_cpu_cfg_softc *a20_cpu_cfg_sc = NULL;
65 #define cpu_cfg_read_4(sc, reg) \
66 bus_space_read_4((sc)->bst, (sc)->bsh, (reg))
67 #define cpu_cfg_write_4(sc, reg, val) \
68 bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val))
71 a20_cpu_cfg_probe(device_t dev)
74 if (ofw_bus_is_compatible(dev, "allwinner,sun7i-cpu-cfg")) {
75 device_set_desc(dev, "A20 CPU Configuration Module");
76 return(BUS_PROBE_DEFAULT);
83 a20_cpu_cfg_attach(device_t dev)
85 struct a20_cpu_cfg_softc *sc = device_get_softc(dev);
91 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
93 device_printf(dev, "could not allocate resource\n");
97 sc->bst = rman_get_bustag(sc->res);
98 sc->bsh = rman_get_bushandle(sc->res);
105 static device_method_t a20_cpu_cfg_methods[] = {
106 DEVMETHOD(device_probe, a20_cpu_cfg_probe),
107 DEVMETHOD(device_attach, a20_cpu_cfg_attach),
111 static driver_t a20_cpu_cfg_driver = {
114 sizeof(struct a20_cpu_cfg_softc),
117 static devclass_t a20_cpu_cfg_devclass;
119 DRIVER_MODULE(a20_cpu_cfg, simplebus, a20_cpu_cfg_driver, a20_cpu_cfg_devclass, 0, 0);
122 a20_read_counter64(void)
126 /* Latch counter, wait for it to be ready to read. */
127 cpu_cfg_write_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG, CNT64_RL_EN);
128 while (cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG) & CNT64_RL_EN)
131 hi = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_HIGH_REG);
132 lo = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_LOW_REG);
134 return (((uint64_t)hi << 32) | lo);