gtmr_fdt.c revision 1.7 
1/* $NetBSD: gtmr_fdt.c,v 1.7 2017/11/30 14:51:01 skrll 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: gtmr_fdt.c,v 1.7 2017/11/30 14:51:01 skrll 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/kernel.h>
38#include <sys/kmem.h>
39
40#include <arm/cortex/gtmr_intr.h>
41#include <arm/cortex/mpcore_var.h>
42#include <arm/cortex/gtmr_var.h>
43
44#include <dev/fdt/fdtvar.h>
45#include <arm/fdt/arm_fdtvar.h>
46
47static int	gtmr_fdt_match(device_t, cfdata_t, void *);
48static void	gtmr_fdt_attach(device_t, device_t, void *);
49
50static void	gtmr_fdt_cpu_hatch(void *, struct cpu_info *);
51
52CFATTACH_DECL_NEW(gtmr_fdt, 0, gtmr_fdt_match, gtmr_fdt_attach, NULL, NULL);
53
54/* The virtual timer list entry */
55#define GTMR_VTIMER 2
56
57static int
58gtmr_fdt_match(device_t parent, cfdata_t cf, void *aux)
59{
60	const char * const compatible[] = {
61		"arm,armv7-timer",
62		"arm,armv8-timer",
63		NULL
64	};
65	struct fdt_attach_args * const faa = aux;
66
67	return of_compatible(faa->faa_phandle, compatible) >= 0;
68}
69
70static void
71gtmr_fdt_attach(device_t parent, device_t self, void *aux)
72{
73	aprint_naive("\n");
74	aprint_normal(": Generic Timer\n");
75
76	struct mpcore_attach_args mpcaa = {
77		.mpcaa_name = "armgtmr",
78		.mpcaa_irq = -1		/* setup handler locally */
79	};
80	struct fdt_attach_args * const faa = aux;
81	const int phandle = faa->faa_phandle;
82
83	char intrstr[128];
84	if (!fdtbus_intr_str(phandle, GTMR_VTIMER, intrstr, sizeof(intrstr))) {
85		aprint_error(": failed to decode interrupt\n");
86		return;
87	}
88
89	void *ih = fdtbus_intr_establish(phandle, GTMR_VTIMER, IPL_CLOCK,
90	    FDT_INTR_MPSAFE, gtmr_intr, NULL);
91	if (ih == NULL) {
92		aprint_error_dev(self, "couldn't install interrupt handler\n");
93		return;
94	}
95	aprint_normal_dev(self, "interrupting on %s\n", intrstr);
96
97	config_found(self, &mpcaa, NULL);
98
99	arm_fdt_cpu_hatch_register(self, gtmr_fdt_cpu_hatch);
100	arm_fdt_timer_register(gtmr_cpu_initclocks);
101}
102
103static void
104gtmr_fdt_cpu_hatch(void *priv, struct cpu_info *ci)
105{
106	gtmr_init_cpu_clock(ci);
107}
108