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/arch/powerpc/kernel/pci_32.c

http://github.com/mirrors/linux
C | 320 lines | 226 code | 48 blank | 46 comment | 38 complexity | 4539b2c91039719860d1f71286fee64c MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Common pmac/prep/chrp pci routines. -- Cort
  4 */
  5
  6#include <linux/kernel.h>
  7#include <linux/pci.h>
  8#include <linux/delay.h>
  9#include <linux/string.h>
 10#include <linux/init.h>
 11#include <linux/capability.h>
 12#include <linux/sched.h>
 13#include <linux/errno.h>
 14#include <linux/memblock.h>
 15#include <linux/syscalls.h>
 16#include <linux/irq.h>
 17#include <linux/list.h>
 18#include <linux/of.h>
 19#include <linux/slab.h>
 20#include <linux/export.h>
 21
 22#include <asm/processor.h>
 23#include <asm/io.h>
 24#include <asm/prom.h>
 25#include <asm/sections.h>
 26#include <asm/pci-bridge.h>
 27#include <asm/ppc-pci.h>
 28#include <asm/byteorder.h>
 29#include <linux/uaccess.h>
 30#include <asm/machdep.h>
 31
 32#undef DEBUG
 33
 34unsigned long isa_io_base     = 0;
 35unsigned long pci_dram_offset = 0;
 36int pcibios_assign_bus_offset = 1;
 37EXPORT_SYMBOL(isa_io_base);
 38EXPORT_SYMBOL(pci_dram_offset);
 39
 40void pcibios_make_OF_bus_map(void);
 41
 42static void fixup_cpc710_pci64(struct pci_dev* dev);
 43static u8* pci_to_OF_bus_map;
 44
 45/* By default, we don't re-assign bus numbers. We do this only on
 46 * some pmacs
 47 */
 48static int pci_assign_all_buses;
 49
 50static int pci_bus_count;
 51
 52/* This will remain NULL for now, until isa-bridge.c is made common
 53 * to both 32-bit and 64-bit.
 54 */
 55struct pci_dev *isa_bridge_pcidev;
 56EXPORT_SYMBOL_GPL(isa_bridge_pcidev);
 57
 58static void
 59fixup_cpc710_pci64(struct pci_dev* dev)
 60{
 61	/* Hide the PCI64 BARs from the kernel as their content doesn't
 62	 * fit well in the resource management
 63	 */
 64	dev->resource[0].start = dev->resource[0].end = 0;
 65	dev->resource[0].flags = 0;
 66	dev->resource[1].start = dev->resource[1].end = 0;
 67	dev->resource[1].flags = 0;
 68}
 69DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_IBM,	PCI_DEVICE_ID_IBM_CPC710_PCI64,	fixup_cpc710_pci64);
 70
 71/*
 72 * Functions below are used on OpenFirmware machines.
 73 */
 74static void
 75make_one_node_map(struct device_node* node, u8 pci_bus)
 76{
 77	const int *bus_range;
 78	int len;
 79
 80	if (pci_bus >= pci_bus_count)
 81		return;
 82	bus_range = of_get_property(node, "bus-range", &len);
 83	if (bus_range == NULL || len < 2 * sizeof(int)) {
 84		printk(KERN_WARNING "Can't get bus-range for %pOF, "
 85		       "assuming it starts at 0\n", node);
 86		pci_to_OF_bus_map[pci_bus] = 0;
 87	} else
 88		pci_to_OF_bus_map[pci_bus] = bus_range[0];
 89
 90	for_each_child_of_node(node, node) {
 91		struct pci_dev* dev;
 92		const unsigned int *class_code, *reg;
 93	
 94		class_code = of_get_property(node, "class-code", NULL);
 95		if (!class_code || ((*class_code >> 8) != PCI_CLASS_BRIDGE_PCI &&
 96			(*class_code >> 8) != PCI_CLASS_BRIDGE_CARDBUS))
 97			continue;
 98		reg = of_get_property(node, "reg", NULL);
 99		if (!reg)
100			continue;
101		dev = pci_get_domain_bus_and_slot(0, pci_bus,
102						  ((reg[0] >> 8) & 0xff));
103		if (!dev || !dev->subordinate) {
104			pci_dev_put(dev);
105			continue;
106		}
107		make_one_node_map(node, dev->subordinate->number);
108		pci_dev_put(dev);
109	}
110}
111	
112void
113pcibios_make_OF_bus_map(void)
114{
115	int i;
116	struct pci_controller *hose, *tmp;
117	struct property *map_prop;
118	struct device_node *dn;
119
120	pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
121	if (!pci_to_OF_bus_map) {
122		printk(KERN_ERR "Can't allocate OF bus map !\n");
123		return;
124	}
125
126	/* We fill the bus map with invalid values, that helps
127	 * debugging.
128	 */
129	for (i=0; i<pci_bus_count; i++)
130		pci_to_OF_bus_map[i] = 0xff;
131
132	/* For each hose, we begin searching bridges */
133	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
134		struct device_node* node = hose->dn;
135
136		if (!node)
137			continue;
138		make_one_node_map(node, hose->first_busno);
139	}
140	dn = of_find_node_by_path("/");
141	map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
142	if (map_prop) {
143		BUG_ON(pci_bus_count > map_prop->length);
144		memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
145	}
146	of_node_put(dn);
147#ifdef DEBUG
148	printk("PCI->OF bus map:\n");
149	for (i=0; i<pci_bus_count; i++) {
150		if (pci_to_OF_bus_map[i] == 0xff)
151			continue;
152		printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
153	}
154#endif
155}
156
157
158/*
159 * Returns the PCI device matching a given OF node
160 */
161int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
162{
163	struct pci_dev *dev = NULL;
164	const __be32 *reg;
165	int size;
166
167	/* Check if it might have a chance to be a PCI device */
168	if (!pci_find_hose_for_OF_device(node))
169		return -ENODEV;
170
171	reg = of_get_property(node, "reg", &size);
172	if (!reg || size < 5 * sizeof(u32))
173		return -ENODEV;
174
175	*bus = (be32_to_cpup(&reg[0]) >> 16) & 0xff;
176	*devfn = (be32_to_cpup(&reg[0]) >> 8) & 0xff;
177
178	/* Ok, here we need some tweak. If we have already renumbered
179	 * all busses, we can't rely on the OF bus number any more.
180	 * the pci_to_OF_bus_map is not enough as several PCI busses
181	 * may match the same OF bus number.
182	 */
183	if (!pci_to_OF_bus_map)
184		return 0;
185
186	for_each_pci_dev(dev)
187		if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
188				dev->devfn == *devfn) {
189			*bus = dev->bus->number;
190			pci_dev_put(dev);
191			return 0;
192		}
193
194	return -ENODEV;
195}
196EXPORT_SYMBOL(pci_device_from_OF_node);
197
198/* We create the "pci-OF-bus-map" property now so it appears in the
199 * /proc device tree
200 */
201void __init
202pci_create_OF_bus_map(void)
203{
204	struct property* of_prop;
205	struct device_node *dn;
206
207	of_prop = memblock_alloc(sizeof(struct property) + 256,
208				 SMP_CACHE_BYTES);
209	if (!of_prop)
210		panic("%s: Failed to allocate %zu bytes\n", __func__,
211		      sizeof(struct property) + 256);
212	dn = of_find_node_by_path("/");
213	if (dn) {
214		memset(of_prop, -1, sizeof(struct property) + 256);
215		of_prop->name = "pci-OF-bus-map";
216		of_prop->length = 256;
217		of_prop->value = &of_prop[1];
218		of_add_property(dn, of_prop);
219		of_node_put(dn);
220	}
221}
222
223void pcibios_setup_phb_io_space(struct pci_controller *hose)
224{
225	unsigned long io_offset;
226	struct resource *res = &hose->io_resource;
227
228	/* Fixup IO space offset */
229	io_offset = pcibios_io_space_offset(hose);
230	res->start += io_offset;
231	res->end += io_offset;
232}
233
234static int __init pcibios_init(void)
235{
236	struct pci_controller *hose, *tmp;
237	int next_busno = 0;
238
239	printk(KERN_INFO "PCI: Probing PCI hardware\n");
240
241	if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
242		pci_assign_all_buses = 1;
243
244	/* Scan all of the recorded PCI controllers.  */
245	list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
246		if (pci_assign_all_buses)
247			hose->first_busno = next_busno;
248		hose->last_busno = 0xff;
249		pcibios_scan_phb(hose);
250		pci_bus_add_devices(hose->bus);
251		if (pci_assign_all_buses || next_busno <= hose->last_busno)
252			next_busno = hose->last_busno + pcibios_assign_bus_offset;
253	}
254	pci_bus_count = next_busno;
255
256	/* OpenFirmware based machines need a map of OF bus
257	 * numbers vs. kernel bus numbers since we may have to
258	 * remap them.
259	 */
260	if (pci_assign_all_buses)
261		pcibios_make_OF_bus_map();
262
263	/* Call common code to handle resource allocation */
264	pcibios_resource_survey();
265
266	/* Call machine dependent fixup */
267	if (ppc_md.pcibios_fixup)
268		ppc_md.pcibios_fixup();
269
270	/* Call machine dependent post-init code */
271	if (ppc_md.pcibios_after_init)
272		ppc_md.pcibios_after_init();
273
274	return 0;
275}
276
277subsys_initcall(pcibios_init);
278
279static struct pci_controller*
280pci_bus_to_hose(int bus)
281{
282	struct pci_controller *hose, *tmp;
283
284	list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
285		if (bus >= hose->first_busno && bus <= hose->last_busno)
286			return hose;
287	return NULL;
288}
289
290/* Provide information on locations of various I/O regions in physical
291 * memory.  Do this on a per-card basis so that we choose the right
292 * root bridge.
293 * Note that the returned IO or memory base is a physical address
294 */
295
296SYSCALL_DEFINE3(pciconfig_iobase, long, which,
297		unsigned long, bus, unsigned long, devfn)
298{
299	struct pci_controller* hose;
300	long result = -EOPNOTSUPP;
301
302	hose = pci_bus_to_hose(bus);
303	if (!hose)
304		return -ENODEV;
305
306	switch (which) {
307	case IOBASE_BRIDGE_NUMBER:
308		return (long)hose->first_busno;
309	case IOBASE_MEMORY:
310		return (long)hose->mem_offset[0];
311	case IOBASE_IO:
312		return (long)hose->io_base_phys;
313	case IOBASE_ISA_IO:
314		return (long)isa_io_base;
315	case IOBASE_ISA_MEM:
316		return (long)isa_mem_base;
317	}
318
319	return result;
320}