plmmc_fdt.c revision 1.4 
1/* $NetBSD: plmmc_fdt.c,v 1.4 2021/01/27 03:10:19 thorpej Exp $ */
2
3/*-
4 * Copyright (c) 2017 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: plmmc_fdt.c,v 1.4 2021/01/27 03:10:19 thorpej Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34#include <sys/device.h>
35#include <sys/systm.h>
36#include <sys/kernel.h>
37
38#include <dev/fdt/fdtvar.h>
39
40#include <dev/ic/pl181reg.h>
41#include <dev/ic/pl181var.h>
42
43static int	plmmc_fdt_match(device_t, cfdata_t, void *);
44static void	plmmc_fdt_attach(device_t, device_t, void *);
45
46static const struct device_compatible_entry compat_data[] = {
47	{ .compat = "arm,pl180" },
48	{ .compat = "arm,pl181" },
49	DEVICE_COMPAT_EOL
50};
51
52CFATTACH_DECL_NEW(plmmc_fdt, sizeof(struct plmmc_softc),
53	plmmc_fdt_match, plmmc_fdt_attach, NULL, NULL);
54
55static int
56plmmc_fdt_match(device_t parent, cfdata_t cf, void *aux)
57{
58	struct fdt_attach_args * const faa = aux;
59
60	return of_compatible_match(faa->faa_phandle, compat_data);
61}
62
63static void
64plmmc_fdt_attach(device_t parent, device_t self, void *aux)
65{
66	struct plmmc_softc * const sc = device_private(self);
67	struct fdt_attach_args * const faa = aux;
68	const int phandle = faa->faa_phandle;
69	struct clk *clk;
70	bus_addr_t addr;
71	bus_size_t size;
72	void *ih;
73
74	if (fdtbus_get_reg(phandle, 0, &addr, &size) != 0) {
75		aprint_error(": missing 'reg' property\n");
76		return;
77	}
78
79	clk = fdtbus_clock_get_index(phandle, 0);
80	if (clk == NULL) {
81		aprint_error(": couldn't get clock\n");
82		return;
83	}
84
85	if (clk_enable(clk) != 0) {
86		aprint_error(": couldn't enable clock\n");
87		return;
88	}
89
90	char intrstr[128];
91	if (!fdtbus_intr_str(phandle, 0, intrstr, sizeof(intrstr))) {
92		aprint_error(": failed to decode interrupt\n");
93		return;
94	}
95
96	sc->sc_dev = self;
97	sc->sc_clock_freq = clk_get_rate(clk);
98	of_getprop_uint32(phandle, "max-frequency", &sc->sc_max_freq);
99	sc->sc_bst = faa->faa_bst;
100	if (bus_space_map(faa->faa_bst, addr, size, 0, &sc->sc_bsh)) {
101		aprint_error(": couldn't map device\n");
102		return;
103	}
104
105	aprint_naive("\n");
106	aprint_normal("\n");
107
108	ih = fdtbus_intr_establish_xname(phandle, 0, IPL_BIO, 0, plmmc_intr, sc,
109	    device_xname(self));
110	if (ih == NULL) {
111		aprint_error_dev(self, "couldn't install interrupt handler\n");
112		return;
113	}
114	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
115
116	plmmc_init(sc);
117}
118