1 /* $NetBSD: acpi_pci_graviton.c,v 1.5 2022/10/15 11:07:38 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2018, 2020 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: acpi_pci_graviton.c,v 1.5 2022/10/15 11:07:38 jmcneill Exp $");
34
35 #include <sys/param.h>
36 #include <sys/bus.h>
37 #include <sys/device.h>
38 #include <sys/intr.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
41 #include <sys/kmem.h>
42 #include <sys/cpu.h>
43
44 #include <dev/pci/pcireg.h>
45 #include <dev/pci/pcivar.h>
46 #include <dev/pci/pciconf.h>
47
48 #include <dev/acpi/acpivar.h>
49 #include <dev/acpi/acpi_pci.h>
50 #include <dev/acpi/acpi_mcfg.h>
51
52 #include <arm/acpi/acpi_pci_machdep.h>
53
54 static int
acpi_pci_graviton_conf_read(pci_chipset_tag_t pc,pcitag_t tag,int reg,pcireg_t * data)55 acpi_pci_graviton_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t *data)
56 {
57 struct acpi_pci_context *ap = pc->pc_conf_v;
58 int b, d, f;
59
60 pci_decompose_tag(pc, tag, &b, &d, &f);
61
62 if (ap->ap_bus == b) {
63 if (d > 0 || f > 0) {
64 *data = -1;
65 return EINVAL;
66 }
67 *data = bus_space_read_4(ap->ap_bst, ap->ap_conf_bsh, reg);
68 return 0;
69 }
70
71 return acpimcfg_conf_read(pc, tag, reg, data);
72 }
73
74 static int
acpi_pci_graviton_conf_write(pci_chipset_tag_t pc,pcitag_t tag,int reg,pcireg_t data)75 acpi_pci_graviton_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t data)
76 {
77 struct acpi_pci_context *ap = pc->pc_conf_v;
78 int b, d, f;
79
80 pci_decompose_tag(pc, tag, &b, &d, &f);
81
82 if (ap->ap_bus == b) {
83 if (d > 0 || f > 0) {
84 return EINVAL;
85 }
86 bus_space_write_4(ap->ap_bst, ap->ap_conf_bsh, reg, data);
87 return 0;
88 }
89
90 return acpimcfg_conf_write(pc, tag, reg, data);
91 }
92
93 static ACPI_STATUS
acpi_pci_graviton_map(ACPI_HANDLE handle,UINT32 level,void * ctx,void ** retval)94 acpi_pci_graviton_map(ACPI_HANDLE handle, UINT32 level, void *ctx, void **retval)
95 {
96 struct acpi_pci_context *ap = ctx;
97 struct acpi_resources res;
98 struct acpi_mem *mem;
99 ACPI_HANDLE parent;
100 ACPI_INTEGER seg;
101 ACPI_STATUS rv;
102 int error;
103
104 rv = AcpiGetParent(handle, &parent);
105 if (ACPI_FAILURE(rv))
106 return rv;
107 rv = acpi_eval_integer(parent, "_SEG", &seg);
108 if (ACPI_FAILURE(rv))
109 seg = 0;
110 if (ap->ap_seg != seg)
111 return AE_OK;
112
113 rv = acpi_resource_parse(ap->ap_dev, handle, "_CRS", &res, &acpi_resource_parse_ops_quiet);
114 if (ACPI_FAILURE(rv))
115 return rv;
116
117 mem = acpi_res_mem(&res, 0);
118 if (mem == NULL) {
119 acpi_resource_cleanup(&res);
120 return AE_NOT_FOUND;
121 }
122
123 error = bus_space_map(ap->ap_bst, mem->ar_base, mem->ar_length,
124 BUS_SPACE_MAP_NONPOSTED, &ap->ap_conf_bsh);
125 if (error != 0)
126 return AE_NO_MEMORY;
127
128 ap->ap_conf_read = acpi_pci_graviton_conf_read;
129 ap->ap_conf_write = acpi_pci_graviton_conf_write;
130
131 return AE_CTRL_TERMINATE;
132 }
133
134 void
acpi_pci_graviton_init(struct acpi_pci_context * ap)135 acpi_pci_graviton_init(struct acpi_pci_context *ap)
136 {
137 ACPI_STATUS rv;
138
139 rv = AcpiGetDevices(__UNCONST("AMZN0001"), acpi_pci_graviton_map, ap, NULL);
140 if (ACPI_FAILURE(rv))
141 return;
142 }
143