1/*-
2 * Copyright (c) 2013 Ruslan Bukin <br@bsdpad.com>
3 * Copyright (c) 2015 Semihalf
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 */
28
29#include "opt_ddb.h"
30#include "opt_platform.h"
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD$");
34
35#include <sys/param.h>
36#include <sys/systm.h>
37#include <sys/bus.h>
38#include <sys/devmap.h>
39
40#include <vm/vm.h>
41#include <vm/pmap.h>
42
43#include <machine/bus.h>
44#include <machine/fdt.h>
45#include <machine/platformvar.h>
46
47#include <dev/fdt/fdt_common.h>
48#include <dev/ofw/openfirm.h>
49
50#include <arm/annapurna/alpine/alpine_mp.h>
51
52#include "platform_if.h"
53
54#define	WDTLOAD		0x000
55#define	LOAD_MIN	0x00000001
56#define	LOAD_MAX	0xFFFFFFFF
57#define	WDTVALUE	0x004
58#define	WDTCONTROL	0x008
59/* control register masks */
60#define	INT_ENABLE	(1 << 0)
61#define	RESET_ENABLE	(1 << 1)
62#define	WDTLOCK		0xC00
63#define	UNLOCK		0x1ACCE551
64#define	LOCK		0x00000001
65
66bus_addr_t al_devmap_pa;
67bus_addr_t al_devmap_size;
68
69static int
70alpine_get_devmap_base(bus_addr_t *pa, bus_addr_t *size)
71{
72	phandle_t node;
73
74	if ((node = OF_finddevice("/")) == -1)
75		return (ENXIO);
76
77	if ((node = fdt_find_compatible(node, "simple-bus", 1)) == 0)
78		return (ENXIO);
79
80	return fdt_get_range(node, 0, pa, size);
81}
82
83static int
84alpine_get_wdt_base(uint32_t *pbase, uint32_t *psize)
85{
86	phandle_t node;
87	u_long base = 0;
88	u_long size = 0;
89
90	if (pbase == NULL || psize == NULL)
91		return (EINVAL);
92
93	if ((node = OF_finddevice("/")) == -1)
94		return (EFAULT);
95
96	if ((node = fdt_find_compatible(node, "simple-bus", 1)) == 0)
97		return (EFAULT);
98
99	if ((node =
100	    fdt_find_compatible(node, "arm,sp805", 1)) == 0)
101		return (EFAULT);
102
103	if (fdt_regsize(node, &base, &size))
104		return (EFAULT);
105
106	*pbase = base;
107	*psize = size;
108
109	return (0);
110}
111
112/*
113 * Construct devmap table with DT-derived config data.
114 */
115static int
116alpine_devmap_init(platform_t plat)
117{
118	alpine_get_devmap_base(&al_devmap_pa, &al_devmap_size);
119	devmap_add_entry(al_devmap_pa, al_devmap_size);
120	return (0);
121}
122
123static void
124alpine_cpu_reset(platform_t plat)
125{
126	uint32_t wdbase, wdsize;
127	bus_addr_t wdbaddr;
128	int ret;
129
130	ret = alpine_get_wdt_base(&wdbase, &wdsize);
131	if (ret) {
132		printf("Unable to get WDT base, do power down manually...");
133		goto infinite;
134	}
135
136	ret = bus_space_map(fdtbus_bs_tag, al_devmap_pa + wdbase,
137	    wdsize, 0, &wdbaddr);
138	if (ret) {
139		printf("Unable to map WDT base, do power down manually...");
140		goto infinite;
141	}
142
143	bus_space_write_4(fdtbus_bs_tag, wdbaddr, WDTLOCK, UNLOCK);
144	bus_space_write_4(fdtbus_bs_tag, wdbaddr, WDTLOAD, LOAD_MIN);
145	bus_space_write_4(fdtbus_bs_tag, wdbaddr, WDTCONTROL,
146	    INT_ENABLE | RESET_ENABLE);
147
148infinite:
149	while (1) {}
150}
151
152static platform_method_t alpine_methods[] = {
153	PLATFORMMETHOD(platform_devmap_init,	alpine_devmap_init),
154	PLATFORMMETHOD(platform_cpu_reset,	alpine_cpu_reset),
155
156#ifdef SMP
157	PLATFORMMETHOD(platform_mp_start_ap,	alpine_mp_start_ap),
158	PLATFORMMETHOD(platform_mp_setmaxid,	alpine_mp_setmaxid),
159#endif
160	PLATFORMMETHOD_END,
161};
162FDT_PLATFORM_DEF(alpine, "alpine", 0, "annapurna,alpine", 200);
163