1 /* $NetBSD: acpi_pci_n1sdp.c,v 1.7 2022/10/15 11:07:38 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 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_n1sdp.c,v 1.7 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 extern struct bus_space arm_generic_bs_tag;
55
56 /* Shared memory location written by the SCP at boot */
57 #define N1SDP_SHARED_MEM_BASE 0x06000000
58
59 #define N1SDP_NSEGS 2
60 #define N1SDP_TABLE_SIZE 0x4000
61
62 #define N1SDP_BUS_SHIFT 20
63 #define N1SDP_DEV_SHIFT 15
64 #define N1SDP_FUNC_SHIFT 12
65
66 struct n1sdp_pcie_discovery_data {
67 uint32_t rc_base_addr;
68 uint32_t nr_bdfs;
69 uint32_t valid_bdfs[0];
70 };
71
72 static struct n1sdp_pcie_discovery_data *n1sdp_data[N1SDP_NSEGS];
73
74 static bool
acpi_pci_n1sdp_valid(pci_chipset_tag_t pc,pcitag_t tag)75 acpi_pci_n1sdp_valid(pci_chipset_tag_t pc, pcitag_t tag)
76 {
77 struct acpi_pci_context *ap = pc->pc_conf_v;
78 u_int n, bdfaddr;
79 int b, d, f;
80
81 if (ap->ap_seg >= N1SDP_NSEGS || n1sdp_data[ap->ap_seg] == NULL)
82 return false;
83
84 pci_decompose_tag(pc, tag, &b, &d, &f);
85
86 bdfaddr = (b << N1SDP_BUS_SHIFT) +
87 (d << N1SDP_DEV_SHIFT) +
88 (f << N1SDP_FUNC_SHIFT);
89
90 for (n = 0; n < n1sdp_data[ap->ap_seg]->nr_bdfs; n++) {
91 if (n1sdp_data[ap->ap_seg]->valid_bdfs[n] == bdfaddr)
92 return true;
93 }
94
95 return false;
96 }
97
98 static int
acpi_pci_n1sdp_conf_read(pci_chipset_tag_t pc,pcitag_t tag,int reg,pcireg_t * data)99 acpi_pci_n1sdp_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t *data)
100 {
101 struct acpi_pci_context *ap = pc->pc_conf_v;
102 int b, d, f;
103
104 pci_decompose_tag(pc, tag, &b, &d, &f);
105
106 if (ap->ap_bus == b) {
107 if (d > 0 || f > 0 || reg >= PCI_EXTCONF_SIZE) {
108 *data = -1;
109 return EINVAL;
110 }
111 *data = bus_space_read_4(ap->ap_bst, ap->ap_conf_bsh, reg);
112 return 0;
113 }
114
115 if (!acpi_pci_n1sdp_valid(pc, tag)) {
116 *data = -1;
117 return 0;
118 }
119
120 return acpimcfg_conf_read(pc, tag, reg, data);
121 }
122
123 static int
acpi_pci_n1sdp_conf_write(pci_chipset_tag_t pc,pcitag_t tag,int reg,pcireg_t data)124 acpi_pci_n1sdp_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t data)
125 {
126 struct acpi_pci_context *ap = pc->pc_conf_v;
127 int b, d, f;
128
129 pci_decompose_tag(pc, tag, &b, &d, &f);
130
131 if (ap->ap_bus == b) {
132 if (d > 0 || f > 0 || reg >= PCI_EXTCONF_SIZE) {
133 return EINVAL;
134 }
135 bus_space_write_4(ap->ap_bst, ap->ap_conf_bsh, reg, data);
136 return 0;
137 }
138
139 if (!acpi_pci_n1sdp_valid(pc, tag))
140 return 0;
141
142 return acpimcfg_conf_write(pc, tag, reg, data);
143 }
144
145 void
acpi_pci_n1sdp_init(struct acpi_pci_context * ap)146 acpi_pci_n1sdp_init(struct acpi_pci_context *ap)
147 {
148 bus_space_tag_t bst = &arm_generic_bs_tag;
149 bus_space_handle_t bsh;
150 paddr_t pa;
151 int error;
152 u_int n;
153
154 if (ap->ap_seg >= N1SDP_NSEGS)
155 return;
156
157 if (n1sdp_data[ap->ap_seg] == NULL) {
158 aprint_normal_dev(ap->ap_dev, "applying N1SDP quirk for segment %d\n", ap->ap_seg);
159
160 pa = N1SDP_SHARED_MEM_BASE + ap->ap_seg * N1SDP_TABLE_SIZE;
161 if (bus_space_map(bst, pa, N1SDP_TABLE_SIZE, BUS_SPACE_MAP_LINEAR, &bsh) != 0)
162 panic("acpi_pci_n1sdp_init: couldn't map PCIe discovery table");
163
164 n1sdp_data[ap->ap_seg] = bus_space_vaddr(bst, bsh);
165 if (n1sdp_data[ap->ap_seg] == NULL)
166 panic("acpi_pci_n1sdp_init: couldn't get PCIe discovery table VA");
167
168 error = bus_space_map(bst, n1sdp_data[ap->ap_seg]->rc_base_addr, PCI_EXTCONF_SIZE,
169 BUS_SPACE_MAP_NONPOSTED, &ap->ap_conf_bsh);
170 if (error != 0)
171 panic("acpi_pci_n1sdp_init: couldn't map segment %d", ap->ap_seg);
172
173 aprint_debug_dev(ap->ap_dev, "N1SDP: RC @ 0x%08x, %d devices\n",
174 n1sdp_data[ap->ap_seg]->rc_base_addr, n1sdp_data[ap->ap_seg]->nr_bdfs);
175 for (n = 0; n < n1sdp_data[ap->ap_seg]->nr_bdfs; n++) {
176 const uint32_t bdf = le32toh(n1sdp_data[ap->ap_seg]->valid_bdfs[n]);
177 const int b = (bdf >> N1SDP_BUS_SHIFT) & 0xff;
178 const int d = (bdf >> N1SDP_DEV_SHIFT) & 0x1f;
179 const int f = (bdf >> N1SDP_FUNC_SHIFT) & 0x7;
180 aprint_debug_dev(ap->ap_dev, "N1SDP: %02x:%02x.%x (%08x)\n", b, d, f, bdf);
181 }
182 }
183
184 ap->ap_conf_read = acpi_pci_n1sdp_conf_read;
185 ap->ap_conf_write = acpi_pci_n1sdp_conf_write;
186
187 /* IO space access seems to cause async SErrors, so disable for now */
188 ap->ap_pciflags_clear = PCI_FLAGS_IO_OKAY;
189 }
190