1 /* $NetBSD: gtmr_acpi.c,v 1.5 2021/08/07 16:18:42 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 2018 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jared McNeill <jmcneill@invisible.ca>.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: gtmr_acpi.c,v 1.5 2021/08/07 16:18:42 thorpej Exp $");
34
35 #include <sys/param.h>
36 #include <sys/bus.h>
37 #include <sys/cpu.h>
38 #include <sys/device.h>
39
40 #include <dev/acpi/acpireg.h>
41 #include <dev/acpi/acpivar.h>
42
43 #include <arm/cortex/gtmr_intr.h>
44 #include <arm/cortex/mpcore_var.h>
45 #include <arm/cortex/gtmr_var.h>
46
47 #include <dev/fdt/fdtvar.h>
48 #include <arm/fdt/arm_fdtvar.h>
49
50 extern struct bus_space arm_generic_bs_tag;
51
52 static int gtmr_acpi_match(device_t, cfdata_t, void *);
53 static void gtmr_acpi_attach(device_t, device_t, void *);
54
55 static void gtmr_acpi_cpu_hatch(void *, struct cpu_info *);
56
57 CFATTACH_DECL_NEW(gtmr_acpi, 0, gtmr_acpi_match, gtmr_acpi_attach, NULL, NULL);
58
59 static int
gtmr_acpi_match(device_t parent,cfdata_t cf,void * aux)60 gtmr_acpi_match(device_t parent, cfdata_t cf, void *aux)
61 {
62 ACPI_TABLE_HEADER *hdrp = aux;
63
64 return memcmp(hdrp->Signature, ACPI_SIG_GTDT, ACPI_NAMESEG_SIZE) == 0;
65 }
66
67 static void
gtmr_acpi_attach(device_t parent,device_t self,void * aux)68 gtmr_acpi_attach(device_t parent, device_t self, void *aux)
69 {
70 ACPI_TABLE_GTDT *gtdt = aux;
71 struct mpcore_attach_args mpcaa;
72 void *ih;
73
74 const int irq = gtdt->VirtualTimerInterrupt;
75 const int ipl = IPL_CLOCK;
76 const int type = (gtdt->VirtualTimerFlags & ACPI_GTDT_INTERRUPT_MODE) ?
77 IST_EDGE : IST_LEVEL;
78
79 aprint_naive("\n");
80 aprint_normal(": irq %d\n", irq);
81
82 ih = intr_establish_xname(irq, ipl, type | IST_MPSAFE, gtmr_intr, NULL, device_xname(self));
83 if (ih == NULL) {
84 aprint_error_dev(self, "couldn't install interrupt handler\n");
85 return;
86 }
87
88 memset(&mpcaa, 0, sizeof(mpcaa));
89 mpcaa.mpcaa_name = "armgtmr";
90 mpcaa.mpcaa_irq = -1;
91 config_found(self, &mpcaa, NULL, CFARGS_NONE);
92
93 arm_fdt_cpu_hatch_register(self, gtmr_acpi_cpu_hatch);
94 arm_fdt_timer_register(gtmr_cpu_initclocks);
95 }
96
97 static void
gtmr_acpi_cpu_hatch(void * priv,struct cpu_info * ci)98 gtmr_acpi_cpu_hatch(void *priv, struct cpu_info *ci)
99 {
100 gtmr_init_cpu_clock(ci);
101 }
102