1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Port for PPC64 David Engebretsen, IBM Corp.
4 * Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
5 *
6 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
7 * Rework, based on alpha PCI code.
8 */
9
10 #undef DEBUG
11
12 #include <linux/kernel.h>
13 #include <linux/pci.h>
14 #include <linux/string.h>
15 #include <linux/init.h>
16 #include <linux/export.h>
17 #include <linux/mm.h>
18 #include <linux/list.h>
19 #include <linux/syscalls.h>
20 #include <linux/irq.h>
21 #include <linux/vmalloc.h>
22
23 #include <asm/processor.h>
24 #include <asm/io.h>
25 #include <asm/prom.h>
26 #include <asm/pci-bridge.h>
27 #include <asm/byteorder.h>
28 #include <asm/machdep.h>
29 #include <asm/ppc-pci.h>
30
31 /* pci_io_base -- the base address from which io bars are offsets.
32 * This is the lowest I/O base address (so bar values are always positive),
33 * and it *must* be the start of ISA space if an ISA bus exists because
34 * ISA drivers use hard coded offsets. If no ISA bus exists nothing
35 * is mapped on the first 64K of IO space
36 */
37 unsigned long pci_io_base;
38 EXPORT_SYMBOL(pci_io_base);
39
pcibios_init(void)40 static int __init pcibios_init(void)
41 {
42 struct pci_controller *hose, *tmp;
43
44 printk(KERN_INFO "PCI: Probing PCI hardware\n");
45
46 /* For now, override phys_mem_access_prot. If we need it,g
47 * later, we may move that initialization to each ppc_md
48 */
49 ppc_md.phys_mem_access_prot = pci_phys_mem_access_prot;
50
51 /* On ppc64, we always enable PCI domains and we keep domain 0
52 * backward compatible in /proc for video cards
53 */
54 pci_add_flags(PCI_ENABLE_PROC_DOMAINS | PCI_COMPAT_DOMAIN_0);
55
56 /* Scan all of the recorded PCI controllers. */
57 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
58 pcibios_scan_phb(hose);
59
60 /* Call common code to handle resource allocation */
61 pcibios_resource_survey();
62
63 /* Add devices. */
64 list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
65 pci_bus_add_devices(hose->bus);
66
67 /* Call machine dependent fixup */
68 if (ppc_md.pcibios_fixup)
69 ppc_md.pcibios_fixup();
70
71 printk(KERN_DEBUG "PCI: Probing PCI hardware done\n");
72
73 return 0;
74 }
75
76 subsys_initcall(pcibios_init);
77
pcibios_unmap_io_space(struct pci_bus * bus)78 int pcibios_unmap_io_space(struct pci_bus *bus)
79 {
80 struct pci_controller *hose;
81
82 WARN_ON(bus == NULL);
83
84 /* If this is not a PHB, we only flush the hash table over
85 * the area mapped by this bridge. We don't play with the PTE
86 * mappings since we might have to deal with sub-page alignments
87 * so flushing the hash table is the only sane way to make sure
88 * that no hash entries are covering that removed bridge area
89 * while still allowing other busses overlapping those pages
90 *
91 * Note: If we ever support P2P hotplug on Book3E, we'll have
92 * to do an appropriate TLB flush here too
93 */
94 if (bus->self) {
95 #ifdef CONFIG_PPC_BOOK3S_64
96 struct resource *res = bus->resource[0];
97 #endif
98
99 pr_debug("IO unmapping for PCI-PCI bridge %s\n",
100 pci_name(bus->self));
101
102 #ifdef CONFIG_PPC_BOOK3S_64
103 __flush_hash_table_range(&init_mm, res->start + _IO_BASE,
104 res->end + _IO_BASE + 1);
105 #endif
106 return 0;
107 }
108
109 /* Get the host bridge */
110 hose = pci_bus_to_host(bus);
111
112 /* Check if we have IOs allocated */
113 if (hose->io_base_alloc == NULL)
114 return 0;
115
116 pr_debug("IO unmapping for PHB %pOF\n", hose->dn);
117 pr_debug(" alloc=0x%p\n", hose->io_base_alloc);
118
119 /* This is a PHB, we fully unmap the IO area */
120 vunmap(hose->io_base_alloc);
121
122 return 0;
123 }
124 EXPORT_SYMBOL_GPL(pcibios_unmap_io_space);
125
pcibios_map_phb_io_space(struct pci_controller * hose)126 static int pcibios_map_phb_io_space(struct pci_controller *hose)
127 {
128 struct vm_struct *area;
129 unsigned long phys_page;
130 unsigned long size_page;
131 unsigned long io_virt_offset;
132
133 phys_page = _ALIGN_DOWN(hose->io_base_phys, PAGE_SIZE);
134 size_page = _ALIGN_UP(hose->pci_io_size, PAGE_SIZE);
135
136 /* Make sure IO area address is clear */
137 hose->io_base_alloc = NULL;
138
139 /* If there's no IO to map on that bus, get away too */
140 if (hose->pci_io_size == 0 || hose->io_base_phys == 0)
141 return 0;
142
143 /* Let's allocate some IO space for that guy. We don't pass
144 * VM_IOREMAP because we don't care about alignment tricks that
145 * the core does in that case. Maybe we should due to stupid card
146 * with incomplete address decoding but I'd rather not deal with
147 * those outside of the reserved 64K legacy region.
148 */
149 area = __get_vm_area(size_page, 0, PHB_IO_BASE, PHB_IO_END);
150 if (area == NULL)
151 return -ENOMEM;
152 hose->io_base_alloc = area->addr;
153 hose->io_base_virt = (void __iomem *)(area->addr +
154 hose->io_base_phys - phys_page);
155
156 pr_debug("IO mapping for PHB %pOF\n", hose->dn);
157 pr_debug(" phys=0x%016llx, virt=0x%p (alloc=0x%p)\n",
158 hose->io_base_phys, hose->io_base_virt, hose->io_base_alloc);
159 pr_debug(" size=0x%016llx (alloc=0x%016lx)\n",
160 hose->pci_io_size, size_page);
161
162 /* Establish the mapping */
163 if (__ioremap_at(phys_page, area->addr, size_page,
164 pgprot_noncached(PAGE_KERNEL)) == NULL)
165 return -ENOMEM;
166
167 /* Fixup hose IO resource */
168 io_virt_offset = pcibios_io_space_offset(hose);
169 hose->io_resource.start += io_virt_offset;
170 hose->io_resource.end += io_virt_offset;
171
172 pr_debug(" hose->io_resource=%pR\n", &hose->io_resource);
173
174 return 0;
175 }
176
pcibios_map_io_space(struct pci_bus * bus)177 int pcibios_map_io_space(struct pci_bus *bus)
178 {
179 WARN_ON(bus == NULL);
180
181 /* If this not a PHB, nothing to do, page tables still exist and
182 * thus HPTEs will be faulted in when needed
183 */
184 if (bus->self) {
185 pr_debug("IO mapping for PCI-PCI bridge %s\n",
186 pci_name(bus->self));
187 pr_debug(" virt=0x%016llx...0x%016llx\n",
188 bus->resource[0]->start + _IO_BASE,
189 bus->resource[0]->end + _IO_BASE);
190 return 0;
191 }
192
193 return pcibios_map_phb_io_space(pci_bus_to_host(bus));
194 }
195 EXPORT_SYMBOL_GPL(pcibios_map_io_space);
196
pcibios_setup_phb_io_space(struct pci_controller * hose)197 void pcibios_setup_phb_io_space(struct pci_controller *hose)
198 {
199 pcibios_map_phb_io_space(hose);
200 }
201
202 #define IOBASE_BRIDGE_NUMBER 0
203 #define IOBASE_MEMORY 1
204 #define IOBASE_IO 2
205 #define IOBASE_ISA_IO 3
206 #define IOBASE_ISA_MEM 4
207
SYSCALL_DEFINE3(pciconfig_iobase,long,which,unsigned long,in_bus,unsigned long,in_devfn)208 SYSCALL_DEFINE3(pciconfig_iobase, long, which, unsigned long, in_bus,
209 unsigned long, in_devfn)
210 {
211 struct pci_controller* hose;
212 struct pci_bus *tmp_bus, *bus = NULL;
213 struct device_node *hose_node;
214
215 /* Argh ! Please forgive me for that hack, but that's the
216 * simplest way to get existing XFree to not lockup on some
217 * G5 machines... So when something asks for bus 0 io base
218 * (bus 0 is HT root), we return the AGP one instead.
219 */
220 if (in_bus == 0 && of_machine_is_compatible("MacRISC4")) {
221 struct device_node *agp;
222
223 agp = of_find_compatible_node(NULL, NULL, "u3-agp");
224 if (agp)
225 in_bus = 0xf0;
226 of_node_put(agp);
227 }
228
229 /* That syscall isn't quite compatible with PCI domains, but it's
230 * used on pre-domains setup. We return the first match
231 */
232
233 list_for_each_entry(tmp_bus, &pci_root_buses, node) {
234 if (in_bus >= tmp_bus->number &&
235 in_bus <= tmp_bus->busn_res.end) {
236 bus = tmp_bus;
237 break;
238 }
239 }
240 if (bus == NULL || bus->dev.of_node == NULL)
241 return -ENODEV;
242
243 hose_node = bus->dev.of_node;
244 hose = PCI_DN(hose_node)->phb;
245
246 switch (which) {
247 case IOBASE_BRIDGE_NUMBER:
248 return (long)hose->first_busno;
249 case IOBASE_MEMORY:
250 return (long)hose->mem_offset[0];
251 case IOBASE_IO:
252 return (long)hose->io_base_phys;
253 case IOBASE_ISA_IO:
254 return (long)isa_io_base;
255 case IOBASE_ISA_MEM:
256 return -EINVAL;
257 }
258
259 return -EOPNOTSUPP;
260 }
261
262 #ifdef CONFIG_NUMA
pcibus_to_node(struct pci_bus * bus)263 int pcibus_to_node(struct pci_bus *bus)
264 {
265 struct pci_controller *phb = pci_bus_to_host(bus);
266 return phb->node;
267 }
268 EXPORT_SYMBOL(pcibus_to_node);
269 #endif
270