1 /* $NetBSD: gic_acpi.c,v 1.8 2023/11/25 20:17:52 jmcneill 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 "pci.h"
33
34 #include <sys/cdefs.h>
35 __KERNEL_RCSID(0, "$NetBSD: gic_acpi.c,v 1.8 2023/11/25 20:17:52 jmcneill Exp $");
36
37 #include <sys/param.h>
38 #include <sys/bus.h>
39 #include <sys/cpu.h>
40 #include <sys/device.h>
41 #include <sys/kmem.h>
42
43 #include <dev/acpi/acpireg.h>
44 #include <dev/acpi/acpivar.h>
45
46 #include <dev/fdt/fdtvar.h>
47
48 #include <arm/cortex/gic_intr.h>
49 #include <arm/cortex/gic_reg.h>
50 #include <arm/cortex/gic_v2m.h>
51 #include <arm/cortex/mpcore_var.h>
52
53 #include <arm/acpi/gic_v2m_acpi.h>
54
55 #define GICD_SIZE 0x1000
56 #define GICC_SIZE 0x1000
57
58 extern struct bus_space arm_generic_bs_tag;
59 extern struct pic_softc *pic_list[];
60
61 static int gic_acpi_match(device_t, cfdata_t, void *);
62 static void gic_acpi_attach(device_t, device_t, void *);
63
64 static ACPI_STATUS gic_acpi_find_gicc(ACPI_SUBTABLE_HEADER *, void *);
65
66 CFATTACH_DECL_NEW(gic_acpi, 0, gic_acpi_match, gic_acpi_attach, NULL, NULL);
67
68 static int
gic_acpi_match(device_t parent,cfdata_t cf,void * aux)69 gic_acpi_match(device_t parent, cfdata_t cf, void *aux)
70 {
71 ACPI_SUBTABLE_HEADER *hdrp = aux;
72 ACPI_MADT_GENERIC_DISTRIBUTOR *gicd;
73
74 if (hdrp->Type != ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR)
75 return 0;
76
77 gicd = (ACPI_MADT_GENERIC_DISTRIBUTOR *)hdrp;
78
79 switch (gicd->Version) {
80 case ACPI_MADT_GIC_VERSION_NONE:
81 return __SHIFTOUT(reg_id_aa64pfr0_el1_read(), ID_AA64PFR0_EL1_GIC) == 0;
82 case ACPI_MADT_GIC_VERSION_V1:
83 case ACPI_MADT_GIC_VERSION_V2:
84 return 1;
85 default:
86 return 0;
87 }
88 }
89
90 static void
gic_acpi_attach(device_t parent,device_t self,void * aux)91 gic_acpi_attach(device_t parent, device_t self, void *aux)
92 {
93 ACPI_MADT_GENERIC_DISTRIBUTOR *gicd = aux;
94 ACPI_MADT_GENERIC_INTERRUPT *gicc = NULL;
95 bus_space_handle_t bsh;
96 device_t armgic;
97 int error;
98
99 acpi_madt_walk(gic_acpi_find_gicc, &gicc);
100 if (gicc == NULL) {
101 aprint_error(": couldn't find GICC registers\n");
102 return;
103 }
104
105 const bus_addr_t addr = ulmin(gicd->BaseAddress, gicc->BaseAddress);
106 const bus_size_t end = ulmax(gicd->BaseAddress + GICD_SIZE, gicc->BaseAddress + GICC_SIZE);
107 const bus_size_t size = end - addr;
108
109 error = bus_space_map(&arm_generic_bs_tag, addr, size, 0, &bsh);
110 if (error) {
111 aprint_error(": couldn't map registers: %d\n", error);
112 return;
113 }
114
115 aprint_naive("\n");
116 aprint_normal(": GIC\n");
117
118 struct mpcore_attach_args mpcaa = {
119 .mpcaa_name = "armgic",
120 .mpcaa_memt = &arm_generic_bs_tag,
121 .mpcaa_memh = bsh,
122 .mpcaa_off1 = gicd->BaseAddress - addr,
123 .mpcaa_off2 = gicc->BaseAddress - addr,
124 };
125
126 armgic = config_found(self, &mpcaa, NULL, CFARGS_NONE);
127 if (armgic != NULL) {
128 arm_fdt_irq_set_handler(armgic_irq_handler);
129
130 #if NPCI > 0
131 acpi_madt_walk(gic_v2m_acpi_find_msi_frame, armgic);
132 #endif
133 }
134 }
135
136 static ACPI_STATUS
gic_acpi_find_gicc(ACPI_SUBTABLE_HEADER * hdrp,void * aux)137 gic_acpi_find_gicc(ACPI_SUBTABLE_HEADER *hdrp, void *aux)
138 {
139 ACPI_MADT_GENERIC_INTERRUPT **giccp = aux;
140
141 if (hdrp->Type != ACPI_MADT_TYPE_GENERIC_INTERRUPT)
142 return AE_OK;
143
144 *giccp = (ACPI_MADT_GENERIC_INTERRUPT *)hdrp;
145
146 return AE_LIMIT;
147 }
148