~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/powerpc/kernel/pci_32.c

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 %s, "
 83                        "assuming it starts at 0\n", node->full_name);
 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_bus_and_slot(pci_bus, ((reg[0] >> 8) & 0xff));
100                 if (!dev || !dev->subordinate) {
101                         pci_dev_put(dev);
102                         continue;
103                 }
104                 make_one_node_map(node, dev->subordinate->number);
105                 pci_dev_put(dev);
106         }
107 }
108         
109 void
110 pcibios_make_OF_bus_map(void)
111 {
112         int i;
113         struct pci_controller *hose, *tmp;
114         struct property *map_prop;
115         struct device_node *dn;
116 
117         pci_to_OF_bus_map = kmalloc(pci_bus_count, GFP_KERNEL);
118         if (!pci_to_OF_bus_map) {
119                 printk(KERN_ERR "Can't allocate OF bus map !\n");
120                 return;
121         }
122 
123         /* We fill the bus map with invalid values, that helps
124          * debugging.
125          */
126         for (i=0; i<pci_bus_count; i++)
127                 pci_to_OF_bus_map[i] = 0xff;
128 
129         /* For each hose, we begin searching bridges */
130         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
131                 struct device_node* node = hose->dn;
132 
133                 if (!node)
134                         continue;
135                 make_one_node_map(node, hose->first_busno);
136         }
137         dn = of_find_node_by_path("/");
138         map_prop = of_find_property(dn, "pci-OF-bus-map", NULL);
139         if (map_prop) {
140                 BUG_ON(pci_bus_count > map_prop->length);
141                 memcpy(map_prop->value, pci_to_OF_bus_map, pci_bus_count);
142         }
143         of_node_put(dn);
144 #ifdef DEBUG
145         printk("PCI->OF bus map:\n");
146         for (i=0; i<pci_bus_count; i++) {
147                 if (pci_to_OF_bus_map[i] == 0xff)
148                         continue;
149                 printk("%d -> %d\n", i, pci_to_OF_bus_map[i]);
150         }
151 #endif
152 }
153 
154 
155 /*
156  * Returns the PCI device matching a given OF node
157  */
158 int pci_device_from_OF_node(struct device_node *node, u8 *bus, u8 *devfn)
159 {
160         struct pci_dev *dev = NULL;
161         const __be32 *reg;
162         int size;
163 
164         /* Check if it might have a chance to be a PCI device */
165         if (!pci_find_hose_for_OF_device(node))
166                 return -ENODEV;
167 
168         reg = of_get_property(node, "reg", &size);
169         if (!reg || size < 5 * sizeof(u32))
170                 return -ENODEV;
171 
172         *bus = (be32_to_cpup(&reg[0]) >> 16) & 0xff;
173         *devfn = (be32_to_cpup(&reg[0]) >> 8) & 0xff;
174 
175         /* Ok, here we need some tweak. If we have already renumbered
176          * all busses, we can't rely on the OF bus number any more.
177          * the pci_to_OF_bus_map is not enough as several PCI busses
178          * may match the same OF bus number.
179          */
180         if (!pci_to_OF_bus_map)
181                 return 0;
182 
183         for_each_pci_dev(dev)
184                 if (pci_to_OF_bus_map[dev->bus->number] == *bus &&
185                                 dev->devfn == *devfn) {
186                         *bus = dev->bus->number;
187                         pci_dev_put(dev);
188                         return 0;
189                 }
190 
191         return -ENODEV;
192 }
193 EXPORT_SYMBOL(pci_device_from_OF_node);
194 
195 /* We create the "pci-OF-bus-map" property now so it appears in the
196  * /proc device tree
197  */
198 void __init
199 pci_create_OF_bus_map(void)
200 {
201         struct property* of_prop;
202         struct device_node *dn;
203 
204         of_prop = memblock_virt_alloc(sizeof(struct property) + 256, 0);
205         dn = of_find_node_by_path("/");
206         if (dn) {
207                 memset(of_prop, -1, sizeof(struct property) + 256);
208                 of_prop->name = "pci-OF-bus-map";
209                 of_prop->length = 256;
210                 of_prop->value = &of_prop[1];
211                 of_add_property(dn, of_prop);
212                 of_node_put(dn);
213         }
214 }
215 
216 void pcibios_setup_phb_io_space(struct pci_controller *hose)
217 {
218         unsigned long io_offset;
219         struct resource *res = &hose->io_resource;
220 
221         /* Fixup IO space offset */
222         io_offset = pcibios_io_space_offset(hose);
223         res->start += io_offset;
224         res->end += io_offset;
225 }
226 
227 static int __init pcibios_init(void)
228 {
229         struct pci_controller *hose, *tmp;
230         int next_busno = 0;
231 
232         printk(KERN_INFO "PCI: Probing PCI hardware\n");
233 
234         if (pci_has_flag(PCI_REASSIGN_ALL_BUS))
235                 pci_assign_all_buses = 1;
236 
237         /* Scan all of the recorded PCI controllers.  */
238         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
239                 if (pci_assign_all_buses)
240                         hose->first_busno = next_busno;
241                 hose->last_busno = 0xff;
242                 pcibios_scan_phb(hose);
243                 pci_bus_add_devices(hose->bus);
244                 if (pci_assign_all_buses || next_busno <= hose->last_busno)
245                         next_busno = hose->last_busno + pcibios_assign_bus_offset;
246         }
247         pci_bus_count = next_busno;
248 
249         /* OpenFirmware based machines need a map of OF bus
250          * numbers vs. kernel bus numbers since we may have to
251          * remap them.
252          */
253         if (pci_assign_all_buses)
254                 pcibios_make_OF_bus_map();
255 
256         /* Call common code to handle resource allocation */
257         pcibios_resource_survey();
258 
259         /* Call machine dependent post-init code */
260         if (ppc_md.pcibios_after_init)
261                 ppc_md.pcibios_after_init();
262 
263         return 0;
264 }
265 
266 subsys_initcall(pcibios_init);
267 
268 static struct pci_controller*
269 pci_bus_to_hose(int bus)
270 {
271         struct pci_controller *hose, *tmp;
272 
273         list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
274                 if (bus >= hose->first_busno && bus <= hose->last_busno)
275                         return hose;
276         return NULL;
277 }
278 
279 /* Provide information on locations of various I/O regions in physical
280  * memory.  Do this on a per-card basis so that we choose the right
281  * root bridge.
282  * Note that the returned IO or memory base is a physical address
283  */
284 
285 long sys_pciconfig_iobase(long which, unsigned long bus, unsigned long devfn)
286 {
287         struct pci_controller* hose;
288         long result = -EOPNOTSUPP;
289 
290         hose = pci_bus_to_hose(bus);
291         if (!hose)
292                 return -ENODEV;
293 
294         switch (which) {
295         case IOBASE_BRIDGE_NUMBER:
296                 return (long)hose->first_busno;
297         case IOBASE_MEMORY:
298                 return (long)hose->mem_offset[0];
299         case IOBASE_IO:
300                 return (long)hose->io_base_phys;
301         case IOBASE_ISA_IO:
302                 return (long)isa_io_base;
303         case IOBASE_ISA_MEM:
304                 return (long)isa_mem_base;
305         }
306 
307         return result;
308 }
309 
310 
311 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp