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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Copyright (C) 2003, 04, 11 Ralf Baechle (ralf@linux-mips.org)
5 * Copyright (C) 2011 Wind River Systems,
6 * written by Ralf Baechle (ralf@linux-mips.org)
7 */
8#include <linux/bug.h>
9#include <linux/kernel.h>
10#include <linux/mm.h>
11#include <linux/memblock.h>
12#include <linux/export.h>
13#include <linux/init.h>
14#include <linux/types.h>
15#include <linux/pci.h>
16#include <linux/of_address.h>
17
18#include <asm/cpu-info.h>
19
20unsigned long PCIBIOS_MIN_IO;
21EXPORT_SYMBOL(PCIBIOS_MIN_IO);
22
23unsigned long PCIBIOS_MIN_MEM;
24EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
25
26static int __init pcibios_set_cache_line_size(void)
27{
28 unsigned int lsize;
29
30 /*
31 * Set PCI cacheline size to that of the highest level in the
32 * cache hierarchy.
33 */
34 lsize = cpu_dcache_line_size();
35 lsize = cpu_scache_line_size() ? : lsize;
36 lsize = cpu_tcache_line_size() ? : lsize;
37
38 BUG_ON(!lsize);
39
40 pci_dfl_cache_line_size = lsize >> 2;
41
42 pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize);
43 return 0;
44}
45arch_initcall(pcibios_set_cache_line_size);
46
47void pci_resource_to_user(const struct pci_dev *dev, int bar,
48 const struct resource *rsrc, resource_size_t *start,
49 resource_size_t *end)
50{
51 phys_addr_t size = resource_size(rsrc);
52
53 *start = fixup_bigphys_addr(rsrc->start, size);
54 *end = rsrc->start + size - 1;
55}
1/*
2 * This program is free software; you can redistribute it and/or modify it
3 * under the terms of the GNU General Public License as published by the
4 * Free Software Foundation; either version 2 of the License, or (at your
5 * option) any later version.
6 *
7 * Copyright (C) 2003, 04, 11 Ralf Baechle (ralf@linux-mips.org)
8 * Copyright (C) 2011 Wind River Systems,
9 * written by Ralf Baechle (ralf@linux-mips.org)
10 */
11#include <linux/bug.h>
12#include <linux/kernel.h>
13#include <linux/mm.h>
14#include <linux/bootmem.h>
15#include <linux/export.h>
16#include <linux/init.h>
17#include <linux/types.h>
18#include <linux/pci.h>
19#include <linux/of_address.h>
20
21#include <asm/cpu-info.h>
22
23/*
24 * If PCI_PROBE_ONLY in pci_flags is set, we don't change any PCI resource
25 * assignments.
26 */
27
28/*
29 * The PCI controller list.
30 */
31
32static struct pci_controller *hose_head, **hose_tail = &hose_head;
33
34unsigned long PCIBIOS_MIN_IO;
35unsigned long PCIBIOS_MIN_MEM;
36
37static int pci_initialized;
38
39/*
40 * We need to avoid collisions with `mirrored' VGA ports
41 * and other strange ISA hardware, so we always want the
42 * addresses to be allocated in the 0x000-0x0ff region
43 * modulo 0x400.
44 *
45 * Why? Because some silly external IO cards only decode
46 * the low 10 bits of the IO address. The 0x00-0xff region
47 * is reserved for motherboard devices that decode all 16
48 * bits, so it's ok to allocate at, say, 0x2800-0x28ff,
49 * but we want to try to avoid allocating at 0x2900-0x2bff
50 * which might have be mirrored at 0x0100-0x03ff..
51 */
52resource_size_t
53pcibios_align_resource(void *data, const struct resource *res,
54 resource_size_t size, resource_size_t align)
55{
56 struct pci_dev *dev = data;
57 struct pci_controller *hose = dev->sysdata;
58 resource_size_t start = res->start;
59
60 if (res->flags & IORESOURCE_IO) {
61 /* Make sure we start at our min on all hoses */
62 if (start < PCIBIOS_MIN_IO + hose->io_resource->start)
63 start = PCIBIOS_MIN_IO + hose->io_resource->start;
64
65 /*
66 * Put everything into 0x00-0xff region modulo 0x400
67 */
68 if (start & 0x300)
69 start = (start + 0x3ff) & ~0x3ff;
70 } else if (res->flags & IORESOURCE_MEM) {
71 /* Make sure we start at our min on all hoses */
72 if (start < PCIBIOS_MIN_MEM + hose->mem_resource->start)
73 start = PCIBIOS_MIN_MEM + hose->mem_resource->start;
74 }
75
76 return start;
77}
78
79static void __devinit pcibios_scanbus(struct pci_controller *hose)
80{
81 static int next_busno;
82 static int need_domain_info;
83 LIST_HEAD(resources);
84 struct pci_bus *bus;
85
86 if (!hose->iommu)
87 PCI_DMA_BUS_IS_PHYS = 1;
88
89 if (hose->get_busno && pci_has_flag(PCI_PROBE_ONLY))
90 next_busno = (*hose->get_busno)();
91
92 pci_add_resource_offset(&resources,
93 hose->mem_resource, hose->mem_offset);
94 pci_add_resource_offset(&resources, hose->io_resource, hose->io_offset);
95 bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose,
96 &resources);
97 if (!bus)
98 pci_free_resource_list(&resources);
99
100 hose->bus = bus;
101
102 need_domain_info = need_domain_info || hose->index;
103 hose->need_domain_info = need_domain_info;
104 if (bus) {
105 next_busno = bus->subordinate + 1;
106 /* Don't allow 8-bit bus number overflow inside the hose -
107 reserve some space for bridges. */
108 if (next_busno > 224) {
109 next_busno = 0;
110 need_domain_info = 1;
111 }
112
113 if (!pci_has_flag(PCI_PROBE_ONLY)) {
114 pci_bus_size_bridges(bus);
115 pci_bus_assign_resources(bus);
116 pci_enable_bridges(bus);
117 }
118 bus->dev.of_node = hose->of_node;
119 }
120}
121
122#ifdef CONFIG_OF
123void __devinit pci_load_of_ranges(struct pci_controller *hose,
124 struct device_node *node)
125{
126 const __be32 *ranges;
127 int rlen;
128 int pna = of_n_addr_cells(node);
129 int np = pna + 5;
130
131 pr_info("PCI host bridge %s ranges:\n", node->full_name);
132 ranges = of_get_property(node, "ranges", &rlen);
133 if (ranges == NULL)
134 return;
135 hose->of_node = node;
136
137 while ((rlen -= np * 4) >= 0) {
138 u32 pci_space;
139 struct resource *res = NULL;
140 u64 addr, size;
141
142 pci_space = be32_to_cpup(&ranges[0]);
143 addr = of_translate_address(node, ranges + 3);
144 size = of_read_number(ranges + pna + 3, 2);
145 ranges += np;
146 switch ((pci_space >> 24) & 0x3) {
147 case 1: /* PCI IO space */
148 pr_info(" IO 0x%016llx..0x%016llx\n",
149 addr, addr + size - 1);
150 hose->io_map_base =
151 (unsigned long)ioremap(addr, size);
152 res = hose->io_resource;
153 res->flags = IORESOURCE_IO;
154 break;
155 case 2: /* PCI Memory space */
156 case 3: /* PCI 64 bits Memory space */
157 pr_info(" MEM 0x%016llx..0x%016llx\n",
158 addr, addr + size - 1);
159 res = hose->mem_resource;
160 res->flags = IORESOURCE_MEM;
161 break;
162 }
163 if (res != NULL) {
164 res->start = addr;
165 res->name = node->full_name;
166 res->end = res->start + size - 1;
167 res->parent = NULL;
168 res->sibling = NULL;
169 res->child = NULL;
170 }
171 }
172}
173#endif
174
175static DEFINE_MUTEX(pci_scan_mutex);
176
177void __devinit register_pci_controller(struct pci_controller *hose)
178{
179 if (request_resource(&iomem_resource, hose->mem_resource) < 0)
180 goto out;
181 if (request_resource(&ioport_resource, hose->io_resource) < 0) {
182 release_resource(hose->mem_resource);
183 goto out;
184 }
185
186 *hose_tail = hose;
187 hose_tail = &hose->next;
188
189 /*
190 * Do not panic here but later - this might happen before console init.
191 */
192 if (!hose->io_map_base) {
193 printk(KERN_WARNING
194 "registering PCI controller with io_map_base unset\n");
195 }
196
197 /*
198 * Scan the bus if it is register after the PCI subsystem
199 * initialization.
200 */
201 if (pci_initialized) {
202 mutex_lock(&pci_scan_mutex);
203 pcibios_scanbus(hose);
204 mutex_unlock(&pci_scan_mutex);
205 }
206
207 return;
208
209out:
210 printk(KERN_WARNING
211 "Skipping PCI bus scan due to resource conflict\n");
212}
213
214static void __init pcibios_set_cache_line_size(void)
215{
216 struct cpuinfo_mips *c = ¤t_cpu_data;
217 unsigned int lsize;
218
219 /*
220 * Set PCI cacheline size to that of the highest level in the
221 * cache hierarchy.
222 */
223 lsize = c->dcache.linesz;
224 lsize = c->scache.linesz ? : lsize;
225 lsize = c->tcache.linesz ? : lsize;
226
227 BUG_ON(!lsize);
228
229 pci_dfl_cache_line_size = lsize >> 2;
230
231 pr_debug("PCI: pci_cache_line_size set to %d bytes\n", lsize);
232}
233
234static int __init pcibios_init(void)
235{
236 struct pci_controller *hose;
237
238 pcibios_set_cache_line_size();
239
240 /* Scan all of the recorded PCI controllers. */
241 for (hose = hose_head; hose; hose = hose->next)
242 pcibios_scanbus(hose);
243
244 pci_fixup_irqs(pci_common_swizzle, pcibios_map_irq);
245
246 pci_initialized = 1;
247
248 return 0;
249}
250
251subsys_initcall(pcibios_init);
252
253static int pcibios_enable_resources(struct pci_dev *dev, int mask)
254{
255 u16 cmd, old_cmd;
256 int idx;
257 struct resource *r;
258
259 pci_read_config_word(dev, PCI_COMMAND, &cmd);
260 old_cmd = cmd;
261 for (idx=0; idx < PCI_NUM_RESOURCES; idx++) {
262 /* Only set up the requested stuff */
263 if (!(mask & (1<<idx)))
264 continue;
265
266 r = &dev->resource[idx];
267 if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
268 continue;
269 if ((idx == PCI_ROM_RESOURCE) &&
270 (!(r->flags & IORESOURCE_ROM_ENABLE)))
271 continue;
272 if (!r->start && r->end) {
273 printk(KERN_ERR "PCI: Device %s not available "
274 "because of resource collisions\n",
275 pci_name(dev));
276 return -EINVAL;
277 }
278 if (r->flags & IORESOURCE_IO)
279 cmd |= PCI_COMMAND_IO;
280 if (r->flags & IORESOURCE_MEM)
281 cmd |= PCI_COMMAND_MEMORY;
282 }
283 if (cmd != old_cmd) {
284 printk("PCI: Enabling device %s (%04x -> %04x)\n",
285 pci_name(dev), old_cmd, cmd);
286 pci_write_config_word(dev, PCI_COMMAND, cmd);
287 }
288 return 0;
289}
290
291unsigned int pcibios_assign_all_busses(void)
292{
293 return 1;
294}
295
296int pcibios_enable_device(struct pci_dev *dev, int mask)
297{
298 int err;
299
300 if ((err = pcibios_enable_resources(dev, mask)) < 0)
301 return err;
302
303 return pcibios_plat_dev_init(dev);
304}
305
306void __devinit pcibios_fixup_bus(struct pci_bus *bus)
307{
308 struct pci_dev *dev = bus->self;
309
310 if (pci_has_flag(PCI_PROBE_ONLY) && dev &&
311 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
312 pci_read_bridge_bases(bus);
313 }
314}
315
316void __init
317pcibios_update_irq(struct pci_dev *dev, int irq)
318{
319 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
320}
321
322#ifdef CONFIG_HOTPLUG
323EXPORT_SYMBOL(PCIBIOS_MIN_IO);
324EXPORT_SYMBOL(PCIBIOS_MIN_MEM);
325#endif
326
327int pci_mmap_page_range(struct pci_dev *dev, struct vm_area_struct *vma,
328 enum pci_mmap_state mmap_state, int write_combine)
329{
330 unsigned long prot;
331
332 /*
333 * I/O space can be accessed via normal processor loads and stores on
334 * this platform but for now we elect not to do this and portable
335 * drivers should not do this anyway.
336 */
337 if (mmap_state == pci_mmap_io)
338 return -EINVAL;
339
340 /*
341 * Ignore write-combine; for now only return uncached mappings.
342 */
343 prot = pgprot_val(vma->vm_page_prot);
344 prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;
345 vma->vm_page_prot = __pgprot(prot);
346
347 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
348 vma->vm_end - vma->vm_start, vma->vm_page_prot);
349}
350
351char * (*pcibios_plat_setup)(char *str) __devinitdata;
352
353char *__devinit pcibios_setup(char *str)
354{
355 if (pcibios_plat_setup)
356 return pcibios_plat_setup(str);
357 return str;
358}