1/* $NetBSD: dwcwdt_fdt.c,v 1.6 2023/04/16 16:51:38 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2018, 2023 Jared McNeill <jmcneill@invisible.ca>
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 ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * 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#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: dwcwdt_fdt.c,v 1.6 2023/04/16 16:51:38 jmcneill Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/device.h>
35#include <sys/intr.h>
36#include <sys/systm.h>
37#include <sys/mutex.h>
38#include <sys/wdog.h>
39
40#include <dev/sysmon/sysmonvar.h>
41#include <dev/ic/dwc_wdt_var.h>
42
43#include <dev/fdt/fdtvar.h>
44
45static const struct device_compatible_entry compat_data[] = {
46	{ .compat = "snps,dw-wdt" },
47	DEVICE_COMPAT_EOL
48};
49
50static int
51dwcwdt_fdt_match(device_t parent, cfdata_t cf, void *aux)
52{
53	struct fdt_attach_args * const faa = aux;
54
55	return of_compatible_match(faa->faa_phandle, compat_data);
56}
57
58static void
59dwcwdt_fdt_attach(device_t parent, device_t self, void *aux)
60{
61	struct dwcwdt_softc * const sc = device_private(self);
62	struct fdt_attach_args * const faa = aux;
63	const int phandle = faa->faa_phandle;
64	struct fdtbus_reset *rst;
65	struct clk *clk;
66	bus_addr_t addr;
67	bus_size_t size;
68
69	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
70		aprint_error(": couldn't get registers\n");
71		return;
72	}
73
74	clk = fdtbus_clock_get_index(phandle, 0);
75	if (clk == NULL || clk_enable(clk) != 0) {
76		aprint_error(": couldn't enable clock\n");
77		return;
78	}
79	rst = fdtbus_reset_get_index(phandle, 0);
80	if (rst && fdtbus_reset_assert(rst) != 0) {
81		aprint_error(": couldn't assert reset\n");
82		return;
83	}
84	if (rst && fdtbus_reset_deassert(rst) != 0) {
85		aprint_error(": couldn't de-assert reset\n");
86		return;
87	}
88
89	sc->sc_dev = self;
90	sc->sc_bst = faa->faa_bst;
91	if (bus_space_map(sc->sc_bst, addr, size, 0, &sc->sc_bsh) != 0) {
92		aprint_error(": couldn't map registers\n");
93		return;
94	}
95	sc->sc_clkrate = clk_get_rate(clk);
96
97	aprint_naive("\n");
98	aprint_normal(": DesignWare Watchdog Timer\n");
99
100	dwcwdt_init(sc);
101}
102
103CFATTACH_DECL_NEW(dwcwdt_fdt, sizeof(struct dwcwdt_softc),
104	dwcwdt_fdt_match, dwcwdt_fdt_attach, NULL, NULL);
105