summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/pci_32.c
blob: 678f87a63645718e0f63488f52ff5ae6fc72ae06 (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
/*
 * Common pmac/prep/chrp pci routines. -- Cort
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/capability.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/bootmem.h>
#include <linux/irq.h>
#include <linux/list.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <linux/export.h>

#include <asm/processor.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/sections.h>
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include <asm/machdep.h>

#undef DEBUG

unsigned long isa_io_base     = 0;
unsigned long pci_dram_offset = 0;
int pcibios_assign_bus_offset = 1;
EXPORT_SYMBOL(isa_io_base);
EXPORT_SYMBOL(pci_dram_offset);

void pcibios_make_OF_bus_map(void);

static void fixup_cpc710_pci64(struct pci_dev* dev);
static u8* pci_to_OF_bus_map;

/* By default, we don't re-assign bus numbers. We do this only on
 * some pmacs
 */
static int pci_assign_all_buses;

static int pci_bus_count;

/* This will remain NULL for now, until isa-bridge.c is made common
 * to both 32-bit and 64-bit.
 */
struct pci_dev *isa_bridge_pcidev;
EXPORT_SYMBOL_GPL(isa_bridge_pcidev);

static void
fixup_cpc710_pci64(struct pci_dev* dev)
{
	/* Hide the PCI64 BARs from the kernel as their content doesn't
	 * fit well in the resource management
	 */
	dev->resource[0].start = dev->resource[0].end = 0;
	dev->resource[0].flags = 0;
	dev->resource[1].start = dev->resource[1].end = 0;
	dev->resource[1].flags = 0;
}
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,	PCI_DEVICE_ID_IBM_CPC710_PCI64,	fixup_cpc710_pci64);

/*
 * Functions below are used on OpenFirmware machines.
 */
static void
make_one_node_map(struct device_node* node, u8 pci_bus)
{
	const int *bus_range;
	int len;

	if (pci_bus >= pci_bus_count)
		return;
	bus_range = of_get_property(node, "bus-range", &len);
	if (bus_range == NULL || len < 2 * sizeof(int)) {
		printk(KERN_WARNING "Can't get bus-range for %s, "
		       "assuming it starts at 0\n", node->full_name);
		pci_to_OF_bus_map[pci_bus] = 0;
	} else
		pci_to_OF_bus_map[pci_bus] = bus_range[0];

	for_each_child_of_node(node, node) {
		struct pci_dev* dev;
		const unsigned int *class_code, *reg;
	
		class_code = of_get_property(node, "class-code", NULL);
		if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
			continue;
		reg = of_get_property(node, "reg", NULL);
		if (!reg)
			continue;
		dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
		if (!dev || !dev->subordinate) {
			pci_dev_put(dev);
			continue;
		}
		make_one_node_map(node, dev->subordinate->number);
		pci_dev_put(dev);
	}
}
	
void
pcibios_make_OF_bus_map(void)
{
	int i;
	struct pci_controller *hose, *tmp;
	struct property *map_prop;
	struct device_node *dn;

	pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
	if (!pci_to_OF_bus_map) {
		printk(KERN_ERR "Can't allocate OF bus map !\n");
		return;
	}

	/* We fill the bus map with invalid values, that helps
	 * debugging.
	 */
	for (i=0; i<pci_bus_count; i++)
		pci_to_OF_bus_map[i] = 0xff;

	/* For each hose, we begin searching bridges */
	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
		struct device_node* node = hose->dn;

		if (!node)
			continue;
		make_one_node_map(node, hose->first_busno);
	}
	dn = of_find_node_by_path("/");
	map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
	if (map_prop) {
		BUG_ON(pci_bus_count > map_prop->length);
		memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
	}
	of_node_put(dn);
#ifdef DEBUG
	printk("PCI->OF bus map:\n");
	for (i=0; i<pci_bus_count; i++) {
		if (pci_to_OF_bus_map[i] == 0xff)
			continue;
		printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
	}
#endif
}


/*
 * Returns the PCI device matching a given OF node
 */
int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
{
	struct pci_dev *dev = NULL;
	const __be32 *reg;
	int size;

	/* Check if it might have a chance to be a PCI device */
	if (!pci_find_hose_for_OF_device(node))
		return -ENODEV;

	reg = of_get_property(node, "reg", &size);
	if (!reg || size < 5 * sizeof(u32))
		return -ENODEV;

	*bus = (be32_to_cpup(&reg[0]) >> 16) & 0xff;
	*devfn = (be32_to_cpup(&reg[0]) >> 8) & 0xff;

	/* Ok, here we need some tweak. If we have already renumbered
	 * all busses, we can't rely on the OF bus number any more.
	 * the pci_to_OF_bus_map is not enough as several PCI busses
	 * may match the same OF bus number.
	 */
	if (!pci_to_OF_bus_map)
		return 0;

	for_each_pci_dev(dev)
		if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
				dev->devfn == *devfn) {
			*bus = dev->bus->number;
			pci_dev_put(dev);
			return 0;
		}

	return -ENODEV;
}
EXPORT_SYMBOL(pci_device_from_OF_node);

/* We create the "pci-OF-bus-map" property now so it appears in the
 * /proc device tree
 */
void __init
pci_create_OF_bus_map(void)
{
	struct property* of_prop;
	struct device_node *dn;

	of_prop = memblock_virt_alloc(sizeof(struct property) + 256, 0);
	dn = of_find_node_by_path("/");
	if (dn) {
		memset(of_prop, -1, sizeof(struct property) + 256);
		of_prop->name = "pci-OF-bus-map";
		of_prop->length = 256;
		of_prop->value = &of_prop[1];
		of_add_property(dn, of_prop);
		of_node_put(dn);
	}
}

void pcibios_setup_phb_io_space(struct pci_controller *hose)
{
	unsigned long io_offset;
	struct resource *res = &hose->io_resource;

	/* Fixup IO space offset */
	io_offset = pcibios_io_space_offset(hose);
	res->start += io_offset;
	res->end += io_offset;
}

static int __init pcibios_init(void)
{
	struct pci_controller *hose, *tmp;
	int next_busno = 0;

	printk(KERN_INFO "PCI: Probing PCI hardware\n");

	if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
		pci_assign_all_buses = 1;

	/* Scan all of the recorded PCI controllers.  */
	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
		if (pci_assign_all_buses)
			hose->first_busno = next_busno;
		hose->last_busno = 0xff;
		pcibios_scan_phb(hose);
		pci_bus_add_devices(hose->bus);
		if (pci_assign_all_buses || next_busno <= hose->last_busno)
			next_busno = hose->last_busno + pcibios_assign_bus_offset;
	}
	pci_bus_count = next_busno;

	/* OpenFirmware based machines need a map of OF bus
	 * numbers vs. kernel bus numbers since we may have to
	 * remap them.
	 */
	if (pci_assign_all_buses)
		pcibios_make_OF_bus_map();

	/* Call common code to handle resource allocation */
	pcibios_resource_survey();

	/* Call machine dependent post-init code */
	if (ppc_md.pcibios_after_init)
		ppc_md.pcibios_after_init();

	return 0;
}

subsys_initcall(pcibios_init);

static struct pci_controller*
pci_bus_to_hose(int bus)
{
	struct pci_controller *hose, *tmp;

	list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
		if (bus >= hose->first_busno && bus <= hose->last_busno)
			return hose;
	return NULL;
}

/* Provide information on locations of various I/O regions in physical
 * memory.  Do this on a per-card basis so that we choose the right
 * root bridge.
 * Note that the returned IO or memory base is a physical address
 */

long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
{
	struct pci_controller* hose;
	long result = -EOPNOTSUPP;

	hose = pci_bus_to_hose(bus);
	if (!hose)
		return -ENODEV;

	switch (which) {
	case IOBASE_BRIDGE_NUMBER:
		return (long)hose->first_busno;
	case IOBASE_MEMORY:
		return (long)hose->mem_offset[0];
	case IOBASE_IO:
		return (long)hose->io_base_phys;
	case IOBASE_ISA_IO:
		return (long)isa_io_base;
	case IOBASE_ISA_MEM:
		return (long)isa_mem_base;
	}

	return result;
}