xref: /openbmc/linux/arch/powerpc/kernel/pci_32.c (revision 407e7517)
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 <linux/uaccess.h>
28 #include <asm/machdep.h>
29 
30 #undef DEBUG
31 
32 unsigned long isa_io_base     = 0;
33 unsigned long pci_dram_offset = 0;
34 int pcibios_assign_bus_offset = 1;
35 EXPORT_SYMBOL(isa_io_base);
36 EXPORT_SYMBOL(pci_dram_offset);
37 
38 void pcibios_make_OF_bus_map(void);
39 
40 static void fixup_cpc710_pci64(struct pci_dev* dev);
41 static u8* pci_to_OF_bus_map;
42 
43 /* By default, we don't re-assign bus numbers. We do this only on
44  * some pmacs
45  */
46 static int pci_assign_all_buses;
47 
48 static int pci_bus_count;
49 
50 /* This will remain NULL for now, until isa-bridge.c is made common
51  * to both 32-bit and 64-bit.
52  */
53 struct pci_dev *isa_bridge_pcidev;
54 EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
55 
56 static void
57 fixup_cpc710_pci64(struct pci_dev* dev)
58 {
59 	/* Hide the PCI64 BARs from the kernel as their content doesn't
60 	 * fit well in the resource management
61 	 */
62 	dev->resource[0].start = dev->resource[0].end = 0;
63 	dev->resource[0].flags = 0;
64 	dev->resource[1].start = dev->resource[1].end = 0;
65 	dev->resource[1].flags = 0;
66 }
67 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,	PCI_DEVICE_ID_IBM_CPC710_PCI64,	fixup_cpc710_pci64);
68 
69 /*
70  * Functions below are used on OpenFirmware machines.
71  */
72 static void
73 make_one_node_map(struct device_node* node, u8 pci_bus)
74 {
75 	const int *bus_range;
76 	int len;
77 
78 	if (pci_bus >= pci_bus_count)
79 		return;
80 	bus_range = of_get_property(node, "bus-range", &len);
81 	if (bus_range == NULL || len < 2 * sizeof(int)) {
82 		printk(KERN_WARNING "Can't get bus-range for %pOF, "
83 		       "assuming it starts at 0\n", node);
84 		pci_to_OF_bus_map[pci_bus] = 0;
85 	} else
86 		pci_to_OF_bus_map[pci_bus] = bus_range[0];
87 
88 	for_each_child_of_node(node, node) {
89 		struct pci_dev* dev;
90 		const unsigned int *class_code, *reg;
91 
92 		class_code = of_get_property(node, "class-code", NULL);
93 		if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
94 			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
95 			continue;
96 		reg = of_get_property(node, "reg", NULL);
97 		if (!reg)
98 			continue;
99 		dev = pci_get_domain_bus_and_slot(0, pci_bus,
100 						  ((reg[0] >> 8) & 0xff));
101 		if (!dev || !dev->subordinate) {
102 			pci_dev_put(dev);
103 			continue;
104 		}
105 		make_one_node_map(node, dev->subordinate->number);
106 		pci_dev_put(dev);
107 	}
108 }
109 
110 void
111 pcibios_make_OF_bus_map(void)
112 {
113 	int i;
114 	struct pci_controller *hose, *tmp;
115 	struct property *map_prop;
116 	struct device_node *dn;
117 
118 	pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
119 	if (!pci_to_OF_bus_map) {
120 		printk(KERN_ERR "Can't allocate OF bus map !\n");
121 		return;
122 	}
123 
124 	/* We fill the bus map with invalid values, that helps
125 	 * debugging.
126 	 */
127 	for (i=0; i<pci_bus_count; i++)
128 		pci_to_OF_bus_map[i] = 0xff;
129 
130 	/* For each hose, we begin searching bridges */
131 	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
132 		struct device_node* node = hose->dn;
133 
134 		if (!node)
135 			continue;
136 		make_one_node_map(node, hose->first_busno);
137 	}
138 	dn = of_find_node_by_path("/");
139 	map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
140 	if (map_prop) {
141 		BUG_ON(pci_bus_count > map_prop->length);
142 		memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
143 	}
144 	of_node_put(dn);
145 #ifdef DEBUG
146 	printk("PCI->OF bus map:\n");
147 	for (i=0; i<pci_bus_count; i++) {
148 		if (pci_to_OF_bus_map[i] == 0xff)
149 			continue;
150 		printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
151 	}
152 #endif
153 }
154 
155 
156 /*
157  * Returns the PCI device matching a given OF node
158  */
159 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
160 {
161 	struct pci_dev *dev = NULL;
162 	const __be32 *reg;
163 	int size;
164 
165 	/* Check if it might have a chance to be a PCI device */
166 	if (!pci_find_hose_for_OF_device(node))
167 		return -ENODEV;
168 
169 	reg = of_get_property(node, "reg", &size);
170 	if (!reg || size < 5 * sizeof(u32))
171 		return -ENODEV;
172 
173 	*bus = (be32_to_cpup(&reg[0]) >> 16) & 0xff;
174 	*devfn = (be32_to_cpup(&reg[0]) >> 8) & 0xff;
175 
176 	/* Ok, here we need some tweak. If we have already renumbered
177 	 * all busses, we can't rely on the OF bus number any more.
178 	 * the pci_to_OF_bus_map is not enough as several PCI busses
179 	 * may match the same OF bus number.
180 	 */
181 	if (!pci_to_OF_bus_map)
182 		return 0;
183 
184 	for_each_pci_dev(dev)
185 		if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
186 				dev->devfn == *devfn) {
187 			*bus = dev->bus->number;
188 			pci_dev_put(dev);
189 			return 0;
190 		}
191 
192 	return -ENODEV;
193 }
194 EXPORT_SYMBOL(pci_device_from_OF_node);
195 
196 /* We create the "pci-OF-bus-map" property now so it appears in the
197  * /proc device tree
198  */
199 void __init
200 pci_create_OF_bus_map(void)
201 {
202 	struct property* of_prop;
203 	struct device_node *dn;
204 
205 	of_prop = memblock_virt_alloc(sizeof(struct property) + 256, 0);
206 	dn = of_find_node_by_path("/");
207 	if (dn) {
208 		memset(of_prop, -1, sizeof(struct property) + 256);
209 		of_prop->name = "pci-OF-bus-map";
210 		of_prop->length = 256;
211 		of_prop->value = &of_prop[1];
212 		of_add_property(dn, of_prop);
213 		of_node_put(dn);
214 	}
215 }
216 
217 void pcibios_setup_phb_io_space(struct pci_controller *hose)
218 {
219 	unsigned long io_offset;
220 	struct resource *res = &hose->io_resource;
221 
222 	/* Fixup IO space offset */
223 	io_offset = pcibios_io_space_offset(hose);
224 	res->start += io_offset;
225 	res->end += io_offset;
226 }
227 
228 static int __init pcibios_init(void)
229 {
230 	struct pci_controller *hose, *tmp;
231 	int next_busno = 0;
232 
233 	printk(KERN_INFO "PCI: Probing PCI hardware\n");
234 
235 	if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
236 		pci_assign_all_buses = 1;
237 
238 	/* Scan all of the recorded PCI controllers.  */
239 	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
240 		if (pci_assign_all_buses)
241 			hose->first_busno = next_busno;
242 		hose->last_busno = 0xff;
243 		pcibios_scan_phb(hose);
244 		pci_bus_add_devices(hose->bus);
245 		if (pci_assign_all_buses || next_busno <= hose->last_busno)
246 			next_busno = hose->last_busno + pcibios_assign_bus_offset;
247 	}
248 	pci_bus_count = next_busno;
249 
250 	/* OpenFirmware based machines need a map of OF bus
251 	 * numbers vs. kernel bus numbers since we may have to
252 	 * remap them.
253 	 */
254 	if (pci_assign_all_buses)
255 		pcibios_make_OF_bus_map();
256 
257 	/* Call common code to handle resource allocation */
258 	pcibios_resource_survey();
259 
260 	/* Call machine dependent post-init code */
261 	if (ppc_md.pcibios_after_init)
262 		ppc_md.pcibios_after_init();
263 
264 	return 0;
265 }
266 
267 subsys_initcall(pcibios_init);
268 
269 static struct pci_controller*
270 pci_bus_to_hose(int bus)
271 {
272 	struct pci_controller *hose, *tmp;
273 
274 	list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
275 		if (bus >= hose->first_busno && bus <= hose->last_busno)
276 			return hose;
277 	return NULL;
278 }
279 
280 /* Provide information on locations of various I/O regions in physical
281  * memory.  Do this on a per-card basis so that we choose the right
282  * root bridge.
283  * Note that the returned IO or memory base is a physical address
284  */
285 
286 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
287 {
288 	struct pci_controller* hose;
289 	long result = -EOPNOTSUPP;
290 
291 	hose = pci_bus_to_hose(bus);
292 	if (!hose)
293 		return -ENODEV;
294 
295 	switch (which) {
296 	case IOBASE_BRIDGE_NUMBER:
297 		return (long)hose->first_busno;
298 	case IOBASE_MEMORY:
299 		return (long)hose->mem_offset[0];
300 	case IOBASE_IO:
301 		return (long)hose->io_base_phys;
302 	case IOBASE_ISA_IO:
303 		return (long)isa_io_base;
304 	case IOBASE_ISA_MEM:
305 		return (long)isa_mem_base;
306 	}
307 
308 	return result;
309 }
310 
311 
312