1/*
2 * Common pmac/prep/chrp pci routines. -- Cort
3 */
4
5#include <linux/kernel.h>
6#include <linux/pci.h>
7#include <linux/delay.h>
8#include <linux/string.h>
9#include <linux/init.h>
10#include <linux/capability.h>
11#include <linux/sched.h>
12#include <linux/errno.h>
13#include <linux/bootmem.h>
14#include <linux/irq.h>
15#include <linux/list.h>
16#include <linux/of.h>
17#include <linux/slab.h>
18#include <linux/export.h>
19
20#include <asm/processor.h>
21#include <asm/io.h>
22#include <asm/prom.h>
23#include <asm/sections.h>
24#include <asm/pci-bridge.h>
25#include <asm/ppc-pci.h>
26#include <asm/byteorder.h>
27#include <asm/uaccess.h>
28#include <asm/machdep.h>
29
30#undef DEBUG
31
32unsigned long isa_io_base     = 0;
33unsigned long pci_dram_offset = 0;
34int pcibios_assign_bus_offset = 1;
35
36void pcibios_make_OF_bus_map(void);
37
38static void fixup_cpc710_pci64(struct pci_dev* dev);
39static u8* pci_to_OF_bus_map;
40
41/* By default, we don't re-assign bus numbers. We do this only on
42 * some pmacs
43 */
44static int pci_assign_all_buses;
45
46static int pci_bus_count;
47
48/* This will remain NULL for now, until isa-bridge.c is made common
49 * to both 32-bit and 64-bit.
50 */
51struct pci_dev *isa_bridge_pcidev;
52EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
53
54static void
55fixup_cpc710_pci64(struct pci_dev* dev)
56{
57	/* Hide the PCI64 BARs from the kernel as their content doesn't
58	 * fit well in the resource management
59	 */
60	dev->resource[0].start = dev->resource[0].end = 0;
61	dev->resource[0].flags = 0;
62	dev->resource[1].start = dev->resource[1].end = 0;
63	dev->resource[1].flags = 0;
64}
65DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,	PCI_DEVICE_ID_IBM_CPC710_PCI64,	fixup_cpc710_pci64);
66
67/*
68 * Functions below are used on OpenFirmware machines.
69 */
70static void
71make_one_node_map(struct device_node* node, u8 pci_bus)
72{
73	const int *bus_range;
74	int len;
75
76	if (pci_bus >= pci_bus_count)
77		return;
78	bus_range = of_get_property(node, "bus-range", &len);
79	if (bus_range == NULL || len < 2 * sizeof(int)) {
80		printk(KERN_WARNING "Can't get bus-range for %s, "
81		       "assuming it starts at 0\n", node->full_name);
82		pci_to_OF_bus_map[pci_bus] = 0;
83	} else
84		pci_to_OF_bus_map[pci_bus] = bus_range[0];
85
86	for_each_child_of_node(node, node) {
87		struct pci_dev* dev;
88		const unsigned int *class_code, *reg;
89
90		class_code = of_get_property(node, "class-code", NULL);
91		if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
92			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
93			continue;
94		reg = of_get_property(node, "reg", NULL);
95		if (!reg)
96			continue;
97		dev = pci_get_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
98		if (!dev || !dev->subordinate) {
99			pci_dev_put(dev);
100			continue;
101		}
102		make_one_node_map(node, dev->subordinate->number);
103		pci_dev_put(dev);
104	}
105}
106
107void
108pcibios_make_OF_bus_map(void)
109{
110	int i;
111	struct pci_controller *hose, *tmp;
112	struct property *map_prop;
113	struct device_node *dn;
114
115	pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
116	if (!pci_to_OF_bus_map) {
117		printk(KERN_ERR "Can't allocate OF bus map !\n");
118		return;
119	}
120
121	/* We fill the bus map with invalid values, that helps
122	 * debugging.
123	 */
124	for (i=0; i<pci_bus_count; i++)
125		pci_to_OF_bus_map[i] = 0xff;
126
127	/* For each hose, we begin searching bridges */
128	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
129		struct device_node* node = hose->dn;
130
131		if (!node)
132			continue;
133		make_one_node_map(node, hose->first_busno);
134	}
135	dn = of_find_node_by_path("/");
136	map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
137	if (map_prop) {
138		BUG_ON(pci_bus_count > map_prop->length);
139		memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
140	}
141	of_node_put(dn);
142#ifdef DEBUG
143	printk("PCI->OF bus map:\n");
144	for (i=0; i<pci_bus_count; i++) {
145		if (pci_to_OF_bus_map[i] == 0xff)
146			continue;
147		printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
148	}
149#endif
150}
151
152
153/*
154 * Returns the PCI device matching a given OF node
155 */
156int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
157{
158	struct pci_dev *dev = NULL;
159	const __be32 *reg;
160	int size;
161
162	/* Check if it might have a chance to be a PCI device */
163	if (!pci_find_hose_for_OF_device(node))
164		return -ENODEV;
165
166	reg = of_get_property(node, "reg", &size);
167	if (!reg || size < 5 * sizeof(u32))
168		return -ENODEV;
169
170	*bus = (be32_to_cpup(&reg[0]) >> 16) & 0xff;
171	*devfn = (be32_to_cpup(&reg[0]) >> 8) & 0xff;
172
173	/* Ok, here we need some tweak. If we have already renumbered
174	 * all busses, we can't rely on the OF bus number any more.
175	 * the pci_to_OF_bus_map is not enough as several PCI busses
176	 * may match the same OF bus number.
177	 */
178	if (!pci_to_OF_bus_map)
179		return 0;
180
181	for_each_pci_dev(dev)
182		if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
183				dev->devfn == *devfn) {
184			*bus = dev->bus->number;
185			pci_dev_put(dev);
186			return 0;
187		}
188
189	return -ENODEV;
190}
191EXPORT_SYMBOL(pci_device_from_OF_node);
192
193/* We create the "pci-OF-bus-map" property now so it appears in the
194 * /proc device tree
195 */
196void __init
197pci_create_OF_bus_map(void)
198{
199	struct property* of_prop;
200	struct device_node *dn;
201
202	of_prop = memblock_virt_alloc(sizeof(struct property) + 256, 0);
203	dn = of_find_node_by_path("/");
204	if (dn) {
205		memset(of_prop, -1, sizeof(struct property) + 256);
206		of_prop->name = "pci-OF-bus-map";
207		of_prop->length = 256;
208		of_prop->value = &of_prop[1];
209		of_add_property(dn, of_prop);
210		of_node_put(dn);
211	}
212}
213
214void pcibios_setup_phb_io_space(struct pci_controller *hose)
215{
216	unsigned long io_offset;
217	struct resource *res = &hose->io_resource;
218
219	/* Fixup IO space offset */
220	io_offset = pcibios_io_space_offset(hose);
221	res->start += io_offset;
222	res->end += io_offset;
223}
224
225static int __init pcibios_init(void)
226{
227	struct pci_controller *hose, *tmp;
228	int next_busno = 0;
229
230	printk(KERN_INFO "PCI: Probing PCI hardware\n");
231
232	if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
233		pci_assign_all_buses = 1;
234
235	/* Scan all of the recorded PCI controllers.  */
236	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
237		if (pci_assign_all_buses)
238			hose->first_busno = next_busno;
239		hose->last_busno = 0xff;
240		pcibios_scan_phb(hose);
241		pci_bus_add_devices(hose->bus);
242		if (pci_assign_all_buses || next_busno <= hose->last_busno)
243			next_busno = hose->last_busno + pcibios_assign_bus_offset;
244	}
245	pci_bus_count = next_busno;
246
247	/* OpenFirmware based machines need a map of OF bus
248	 * numbers vs. kernel bus numbers since we may have to
249	 * remap them.
250	 */
251	if (pci_assign_all_buses)
252		pcibios_make_OF_bus_map();
253
254	/* Call common code to handle resource allocation */
255	pcibios_resource_survey();
256
257	/* Call machine dependent post-init code */
258	if (ppc_md.pcibios_after_init)
259		ppc_md.pcibios_after_init();
260
261	return 0;
262}
263
264subsys_initcall(pcibios_init);
265
266static struct pci_controller*
267pci_bus_to_hose(int bus)
268{
269	struct pci_controller *hose, *tmp;
270
271	list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
272		if (bus >= hose->first_busno && bus <= hose->last_busno)
273			return hose;
274	return NULL;
275}
276
277/* Provide information on locations of various I/O regions in physical
278 * memory.  Do this on a per-card basis so that we choose the right
279 * root bridge.
280 * Note that the returned IO or memory base is a physical address
281 */
282
283long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
284{
285	struct pci_controller* hose;
286	long result = -EOPNOTSUPP;
287
288	hose = pci_bus_to_hose(bus);
289	if (!hose)
290		return -ENODEV;
291
292	switch (which) {
293	case IOBASE_BRIDGE_NUMBER:
294		return (long)hose->first_busno;
295	case IOBASE_MEMORY:
296		return (long)hose->mem_offset[0];
297	case IOBASE_IO:
298		return (long)hose->io_base_phys;
299	case IOBASE_ISA_IO:
300		return (long)isa_io_base;
301	case IOBASE_ISA_MEM:
302		return (long)isa_mem_base;
303	}
304
305	return result;
306}
307
308
309