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
45 static const struct device_compatible_entry compat_data[] = {
46 { .compat = "snps,dw-wdt" },
47 DEVICE_COMPAT_EOL
48 };
49
50 static int
dwcwdt_fdt_match(device_t parent,cfdata_t cf,void * aux)51 dwcwdt_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
58 static void
dwcwdt_fdt_attach(device_t parent,device_t self,void * aux)59 dwcwdt_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
103 CFATTACH_DECL_NEW(dwcwdt_fdt, sizeof(struct dwcwdt_softc),
104 dwcwdt_fdt_match, dwcwdt_fdt_attach, NULL, NULL);
105