acpi_pci_n1sdp.c revision 1.3
1/* $NetBSD: acpi_pci_n1sdp.c,v 1.3 2020/06/15 18:57:39 ad 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 1.3 2020/06/15 18:57:39 ad 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/extent.h> 42#include <sys/kmem.h> 43#include <sys/cpu.h> 44 45#include <dev/pci/pcireg.h> 46#include <dev/pci/pcivar.h> 47#include <dev/pci/pciconf.h> 48 49#include <dev/acpi/acpivar.h> 50#include <dev/acpi/acpi_pci.h> 51#include <dev/acpi/acpi_mcfg.h> 52 53#include <arm/acpi/acpi_pci_machdep.h> 54 55extern struct bus_space arm_generic_bs_tag; 56 57/* Shared memory location written by the SCP at boot */ 58#define N1SDP_SHARED_MEM_BASE 0x06000000 59 60#define N1SDP_NSEGS 2 61#define N1SDP_TABLE_SIZE 0x4000 62 63#define N1SDP_BUS_SHIFT 20 64#define N1SDP_DEV_SHIFT 15 65#define N1SDP_FUNC_SHIFT 12 66 67struct n1sdp_pcie_discovery_data { 68 uint32_t rc_base_addr; 69 uint32_t nr_bdfs; 70 uint32_t valid_bdfs[0]; 71}; 72 73static struct n1sdp_pcie_discovery_data *n1sdp_data[N1SDP_NSEGS]; 74 75static bool 76acpi_pci_n1sdp_valid(pci_chipset_tag_t pc, pcitag_t tag) 77{ 78 struct acpi_pci_context *ap = pc->pc_conf_v; 79 u_int n, bdfaddr; 80 int b, d, f; 81 82 if (ap->ap_seg >= N1SDP_NSEGS || n1sdp_data[ap->ap_seg] == NULL) 83 return false; 84 85 pci_decompose_tag(pc, tag, &b, &d, &f); 86 87 bdfaddr = (b << N1SDP_BUS_SHIFT) + 88 (d << N1SDP_DEV_SHIFT) + 89 (f << N1SDP_FUNC_SHIFT); 90 91 for (n = 0; n < n1sdp_data[ap->ap_seg]->nr_bdfs; n++) { 92 if (n1sdp_data[ap->ap_seg]->valid_bdfs[n] == bdfaddr) 93 return true; 94 } 95 96 return false; 97} 98 99static int 100acpi_pci_n1sdp_conf_read(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t *data) 101{ 102 struct acpi_pci_context *ap = pc->pc_conf_v; 103 int b, d, f; 104 105 pci_decompose_tag(pc, tag, &b, &d, &f); 106 107 if (ap->ap_bus == b) { 108 if (d > 0 || f > 0 || reg >= PCI_EXTCONF_SIZE) { 109 *data = -1; 110 return EINVAL; 111 } 112 *data = bus_space_read_4(ap->ap_bst, ap->ap_conf_bsh, reg); 113 return 0; 114 } 115 116 if (!acpi_pci_n1sdp_valid(pc, tag)) { 117 *data = -1; 118 return 0; 119 } 120 121 return acpimcfg_conf_read(pc, tag, reg, data); 122} 123 124static int 125acpi_pci_n1sdp_conf_write(pci_chipset_tag_t pc, pcitag_t tag, int reg, pcireg_t data) 126{ 127 struct acpi_pci_context *ap = pc->pc_conf_v; 128 int b, d, f; 129 130 pci_decompose_tag(pc, tag, &b, &d, &f); 131 132 if (ap->ap_bus == b) { 133 if (d > 0 || f > 0 || reg >= PCI_EXTCONF_SIZE) { 134 return EINVAL; 135 } 136 bus_space_write_4(ap->ap_bst, ap->ap_conf_bsh, reg, data); 137 return 0; 138 } 139 140 if (!acpi_pci_n1sdp_valid(pc, tag)) 141 return 0; 142 143 return acpimcfg_conf_write(pc, tag, reg, data); 144} 145 146void 147acpi_pci_n1sdp_init(struct acpi_pci_context *ap) 148{ 149 bus_space_tag_t bst = &arm_generic_bs_tag; 150 bus_space_handle_t bsh; 151 paddr_t pa; 152 int error; 153 u_int n; 154 155 if (ap->ap_seg >= N1SDP_NSEGS) 156 return; 157 158 if (n1sdp_data[ap->ap_seg] == NULL) { 159 aprint_normal_dev(ap->ap_dev, "applying N1SDP quirk for segment %d\n", ap->ap_seg); 160 161 pa = N1SDP_SHARED_MEM_BASE + ap->ap_seg * N1SDP_TABLE_SIZE; 162 if (bus_space_map(bst, pa, N1SDP_TABLE_SIZE, BUS_SPACE_MAP_LINEAR, &bsh) != 0) 163 panic("acpi_pci_n1sdp_init: couldn't map PCIe discovery table"); 164 165 n1sdp_data[ap->ap_seg] = bus_space_vaddr(bst, bsh); 166 if (n1sdp_data[ap->ap_seg] == NULL) 167 panic("acpi_pci_n1sdp_init: couldn't get PCIe discovery table VA"); 168 169 error = bus_space_map(bst, n1sdp_data[ap->ap_seg]->rc_base_addr, PCI_EXTCONF_SIZE, 170 _ARM_BUS_SPACE_MAP_STRONGLY_ORDERED, &ap->ap_conf_bsh); 171 if (error != 0) 172 panic("acpi_pci_n1sdp_init: couldn't map segment %d", ap->ap_seg); 173 174 aprint_debug_dev(ap->ap_dev, "N1SDP: RC @ 0x%08x, %d devices\n", 175 n1sdp_data[ap->ap_seg]->rc_base_addr, n1sdp_data[ap->ap_seg]->nr_bdfs); 176 for (n = 0; n < n1sdp_data[ap->ap_seg]->nr_bdfs; n++) { 177 const uint32_t bdf = n1sdp_data[ap->ap_seg]->valid_bdfs[n]; 178 const int b = (bdf >> N1SDP_BUS_SHIFT) & 0xff; 179 const int d = (bdf >> N1SDP_DEV_SHIFT) & 0x1f; 180 const int f = (bdf >> N1SDP_FUNC_SHIFT) & 0x7; 181 aprint_debug_dev(ap->ap_dev, "N1SDP: %02x:%02x.%x (%08x)\n", b, d, f, bdf); 182 } 183 } 184 185 ap->ap_conf_read = acpi_pci_n1sdp_conf_read; 186 ap->ap_conf_write = acpi_pci_n1sdp_conf_write; 187 188 /* IO space access seems to cause async SErrors, so disable for now */ 189 ap->ap_pciflags_clear = PCI_FLAGS_IO_OKAY; 190} 191