1/*-
2 * Copyright (c) 2013 Ganbold Tsagaankhuu <ganbold@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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
24 * SUCH DAMAGE.
25 */
26
27/* CPU configuration module for Allwinner A20 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/bus.h>
35#include <sys/kernel.h>
36#include <sys/module.h>
37#include <sys/malloc.h>
38#include <sys/rman.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/intr.h>
45
46#include <dev/fdt/fdt_common.h>
47#include <dev/ofw/openfirm.h>
48#include <dev/ofw/ofw_bus.h>
49#include <dev/ofw/ofw_bus_subr.h>
50
51#include <machine/bus.h>
52
53#include "a20_cpu_cfg.h"
54
55struct a20_cpu_cfg_softc {
56	struct resource 	*res;
57	bus_space_tag_t 	bst;
58	bus_space_handle_t	bsh;
59};
60
61static struct a20_cpu_cfg_softc *a20_cpu_cfg_sc = NULL;
62
63#define cpu_cfg_read_4(sc, reg) 	\
64	bus_space_read_4((sc)->bst, (sc)->bsh, (reg))
65#define cpu_cfg_write_4(sc, reg, val)	\
66	bus_space_write_4((sc)->bst, (sc)->bsh, (reg), (val))
67
68static int
69a20_cpu_cfg_probe(device_t dev)
70{
71
72	if (!ofw_bus_status_okay(dev))
73		return (ENXIO);
74
75	if (ofw_bus_is_compatible(dev, "allwinner,sun7i-cpu-cfg")) {
76		device_set_desc(dev, "A20 CPU Configuration Module");
77		return(BUS_PROBE_DEFAULT);
78	}
79
80	return (ENXIO);
81}
82
83static int
84a20_cpu_cfg_attach(device_t dev)
85{
86	struct a20_cpu_cfg_softc *sc = device_get_softc(dev);
87	int rid = 0;
88
89	if (a20_cpu_cfg_sc)
90		return (ENXIO);
91
92	sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
93	if (!sc->res) {
94		device_printf(dev, "could not allocate resource\n");
95		return (ENXIO);
96	}
97
98	sc->bst = rman_get_bustag(sc->res);
99	sc->bsh = rman_get_bushandle(sc->res);
100
101	a20_cpu_cfg_sc = sc;
102
103	return (0);
104}
105
106static device_method_t a20_cpu_cfg_methods[] = {
107	DEVMETHOD(device_probe, 	a20_cpu_cfg_probe),
108	DEVMETHOD(device_attach,	a20_cpu_cfg_attach),
109	{ 0, 0 }
110};
111
112static driver_t a20_cpu_cfg_driver = {
113	"a20_cpu_cfg",
114	a20_cpu_cfg_methods,
115	sizeof(struct a20_cpu_cfg_softc),
116};
117
118static devclass_t a20_cpu_cfg_devclass;
119
120EARLY_DRIVER_MODULE(a20_cpu_cfg, simplebus, a20_cpu_cfg_driver, a20_cpu_cfg_devclass, 0, 0,
121    BUS_PASS_RESOURCE + BUS_PASS_ORDER_MIDDLE);
122
123uint64_t
124a20_read_counter64(void)
125{
126	uint32_t lo, hi;
127
128	/* Latch counter, wait for it to be ready to read. */
129	cpu_cfg_write_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG, CNT64_RL_EN);
130	while (cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_CTRL_REG) & CNT64_RL_EN)
131		continue;
132
133	hi = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_HIGH_REG);
134	lo = cpu_cfg_read_4(a20_cpu_cfg_sc, OSC24M_CNT64_LOW_REG);
135
136	return (((uint64_t)hi << 32) | lo);
137}
138
139