summaryrefslogtreecommitdiff
path: root/arch/sh/drivers/pci/pci.c
blob: c8b36b7ceb982c2b87ea365ef7231b43dab6f286 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
/*
 * New-style PCI core.
 *
 * Copyright (c) 2004 - 2009  Paul Mundt
 * Copyright (c) 2002  M. R. Brown
 *
 * Modelled after arch/mips/pci/pci.c:
 *  Copyright (C) 2003, 04 Ralf Baechle (ralf@linux-mips.org)
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/dma-debug.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/export.h>

unsigned long PCIBIOS_MIN_IO = 0x0000;
unsigned long PCIBIOS_MIN_MEM = 0;

/*
 * The PCI controller list.
 */
static struct pci_channel *hose_head, **hose_tail = &hose_head;

static int pci_initialized;

static void pcibios_scanbus(struct pci_channel *hose)
{
	static int next_busno;
	static int need_domain_info;
	LIST_HEAD(resources);
	struct resource *res;
	resource_size_t offset;
	int i;
	struct pci_bus *bus;

	for (i = 0; i < hose->nr_resources; i++) {
		res = hose->resources + i;
		offset = 0;
		if (res->flags & IORESOURCE_IO)
			offset = hose->io_offset;
		else if (res->flags & IORESOURCE_MEM)
			offset = hose->mem_offset;
		pci_add_resource_offset(&resources, res, offset);
	}

	bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose,
				&resources);
	hose->bus = bus;

	need_domain_info = need_domain_info || hose->index;
	hose->need_domain_info = need_domain_info;

	if (!bus) {
		pci_free_resource_list(&resources);
		return;
	}

	next_busno = bus->busn_res.end + 1;
	/* Don't allow 8-bit bus number overflow inside the hose -
	   reserve some space for bridges. */
	if (next_busno > 224) {
		next_busno = 0;
		need_domain_info = 1;
	}

	pci_bus_size_bridges(bus);
	pci_bus_assign_resources(bus);
	pci_bus_add_devices(bus);
}

/*
 * This interrupt-safe spinlock protects all accesses to PCI
 * configuration space.
 */
DEFINE_RAW_SPINLOCK(pci_config_lock);
static DEFINE_MUTEX(pci_scan_mutex);

int register_pci_controller(struct pci_channel *hose)
{
	int i;

	for (i = 0; i < hose->nr_resources; i++) {
		struct resource *res = hose->resources + i;

		if (res->flags & IORESOURCE_IO) {
			if (request_resource(&ioport_resource, res) < 0)
				goto out;
		} else {
			if (request_resource(&iomem_resource, res) < 0)
				goto out;
		}
	}

	*hose_tail = hose;
	hose_tail = &hose->next;

	/*
	 * Do not panic here but later - this might happen before console init.
	 */
	if (!hose->io_map_base) {
		printk(KERN_WARNING
		       "registering PCI controller with io_map_base unset\n");
	}

	/*
	 * Setup the ERR/PERR and SERR timers, if available.
	 */
	pcibios_enable_timers(hose);

	/*
	 * Scan the bus if it is register after the PCI subsystem
	 * initialization.
	 */
	if (pci_initialized) {
		mutex_lock(&pci_scan_mutex);
		pcibios_scanbus(hose);
		mutex_unlock(&pci_scan_mutex);
	}

	return 0;

out:
	for (--i; i >= 0; i--)
		release_resource(&hose->resources[i]);

	printk(KERN_WARNING "Skipping PCI bus scan due to resource conflict\n");
	return -1;
}

static int __init pcibios_init(void)
{
	struct pci_channel *hose;

	/* Scan all of the recorded PCI controllers.  */
	for (hose = hose_head; hose; hose = hose->next)
		pcibios_scanbus(hose);

	pci_fixup_irqs(pci_common_swizzle, pcibios_map_platform_irq);

	dma_debug_add_bus(&pci_bus_type);

	pci_initialized = 1;

	return 0;
}
subsys_initcall(pcibios_init);

/*
 *  Called after each bus is probed, but before its children
 *  are examined.
 */
void pcibios_fixup_bus(struct pci_bus *bus)
{
}

/*
 * We need to avoid collisions with `mirrored' VGA ports
 * and other strange ISA hardware, so we always want the
 * addresses to be allocated in the 0x000-0x0ff region
 * modulo 0x400.
 */
resource_size_t pcibios_align_resource(void *data, const struct resource *res,
				resource_size_t size, resource_size_t align)
{
	struct pci_dev *dev = data;
	struct pci_channel *hose = dev->sysdata;
	resource_size_t start = res->start;

	if (res->flags & IORESOURCE_IO) {
		if (start < PCIBIOS_MIN_IO + hose->resources[0].start)
			start = PCIBIOS_MIN_IO + hose->resources[0].start;

		/*
                 * Put everything into 0x00-0xff region modulo 0x400.
		 */
		if (start & 0x300)
			start = (start + 0x3ff) & ~0x3ff;
	}

	return start;
}

static void __init
pcibios_bus_report_status_early(struct pci_channel *hose,
				int top_bus, int current_bus,
				unsigned int status_mask, int warn)
{
	unsigned int pci_devfn;
	u16 status;
	int ret;

	for (pci_devfn = 0; pci_devfn < 0xff; pci_devfn++) {
		if (PCI_FUNC(pci_devfn))
			continue;
		ret = early_read_config_word(hose, top_bus, current_bus,
					     pci_devfn, PCI_STATUS, &status);
		if (ret != PCIBIOS_SUCCESSFUL)
			continue;
		if (status == 0xffff)
			continue;

		early_write_config_word(hose, top_bus, current_bus,
					pci_devfn, PCI_STATUS,
					status & status_mask);
		if (warn)
			printk("(%02x:%02x: %04X) ", current_bus,
			       pci_devfn, status);
	}
}

/*
 * We can't use pci_find_device() here since we are
 * called from interrupt context.
 */
static void __ref
pcibios_bus_report_status(struct pci_bus *bus, unsigned int status_mask,
			  int warn)
{
	struct pci_dev *dev;

	list_for_each_entry(dev, &bus->devices, bus_list) {
		u16 status;

		/*
		 * ignore host bridge - we handle
		 * that separately
		 */
		if (dev->bus->number == 0 && dev->devfn == 0)
			continue;

		pci_read_config_word(dev, PCI_STATUS, &status);
		if (status == 0xffff)
			continue;

		if ((status & status_mask) == 0)
			continue;

		/* clear the status errors */
		pci_write_config_word(dev, PCI_STATUS, status & status_mask);

		if (warn)
			printk("(%s: %04X) ", pci_name(dev), status);
	}

	list_for_each_entry(dev, &bus->devices, bus_list)
		if (dev->subordinate)
			pcibios_bus_report_status(dev->subordinate, status_mask, warn);
}

void __ref pcibios_report_status(unsigned int status_mask, int warn)
{
	struct pci_channel *hose;

	for (hose = hose_head; hose; hose = hose->next) {
		if (unlikely(!hose->bus))
			pcibios_bus_report_status_early(hose, hose_head->index,
					hose->index, status_mask, warn);
		else
			pcibios_bus_report_status(hose->bus, status_mask, warn);
	}
}

int pci_mmap_page_range(struct pci_dev *dev, int bar,
			struct vm_area_struct *vma,
			enum pci_mmap_state mmap_state, int write_combine)
{
	/*
	 * I/O space can be accessed via normal processor loads and stores on
	 * this platform but for now we elect not to do this and portable
	 * drivers should not do this anyway.
	 */
	if (mmap_state == pci_mmap_io)
		return -EINVAL;

	/*
	 * Ignore write-combine; for now only return uncached mappings.
	 */
	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

	return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
			       vma->vm_end - vma->vm_start,
			       vma->vm_page_prot);
}

#ifndef CONFIG_GENERIC_IOMAP

void __iomem *__pci_ioport_map(struct pci_dev *dev,
			       unsigned long port, unsigned int nr)
{
	struct pci_channel *chan = dev->sysdata;

	if (unlikely(!chan->io_map_base)) {
		chan->io_map_base = sh_io_port_base;

		if (pci_domains_supported)
			panic("To avoid data corruption io_map_base MUST be "
			      "set with multiple PCI domains.");
	}

	return (void __iomem *)(chan->io_map_base + port);
}

void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
{
	iounmap(addr);
}
EXPORT_SYMBOL(pci_iounmap);

#endif /* CONFIG_GENERIC_IOMAP */

EXPORT_SYMBOL(PCIBIOS_MIN_IO);
EXPORT_SYMBOL(PCIBIOS_MIN_MEM);