2 * linux/arch/alpha/kernel/pci.c
4 * Extruded from code written by
5 * Dave Rusling (david.rusling@reo.mts.dec.com)
6 * David Mosberger (davidm@cs.arizona.edu)
9 /* 2.3.x PCI/resources, 1999 Andrea Arcangeli <andrea@suse.de> */
12 * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
13 * PCI-PCI bridges cleanup
15 #include <linux/string.h>
16 #include <linux/pci.h>
17 #include <linux/init.h>
18 #include <linux/ioport.h>
19 #include <linux/kernel.h>
20 #include <linux/bootmem.h>
21 #include <linux/module.h>
22 #include <linux/cache.h>
23 #include <linux/slab.h>
24 #include <asm/machvec.h>
31 * Some string constants used by the various core logics.
34 const char *const pci_io_names[] = {
35 "PCI IO bus 0", "PCI IO bus 1", "PCI IO bus 2", "PCI IO bus 3",
36 "PCI IO bus 4", "PCI IO bus 5", "PCI IO bus 6", "PCI IO bus 7"
39 const char *const pci_mem_names[] = {
40 "PCI mem bus 0", "PCI mem bus 1", "PCI mem bus 2", "PCI mem bus 3",
41 "PCI mem bus 4", "PCI mem bus 5", "PCI mem bus 6", "PCI mem bus 7"
44 const char pci_hae0_name[] = "HAE0";
46 /* Indicate whether we respect the PCI setup left by console. */
48 * Make this long-lived so that we know when shutting down
49 * whether we probed only or not.
54 * The PCI controller list.
57 struct pci_controller *hose_head, **hose_tail = &hose_head;
58 struct pci_controller *pci_isa_hose;
65 quirk_isa_bridge(struct pci_dev *dev)
67 dev->class = PCI_CLASS_BRIDGE_ISA << 8;
69 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82378, quirk_isa_bridge);
72 quirk_cypress(struct pci_dev *dev)
74 /* The Cypress bridge responds on the PCI bus in the address range
75 0xffff0000-0xffffffff (conventional x86 BIOS ROM). There is no
76 way to turn this off. The bridge also supports several extended
77 BIOS ranges (disabled after power-up), and some consoles do turn
78 them on. So if we use a large direct-map window, or a large SG
79 window, we must avoid the entire 0xfff00000-0xffffffff region. */
80 if (dev->class >> 8 == PCI_CLASS_BRIDGE_ISA) {
81 if (__direct_map_base + __direct_map_size >= 0xfff00000UL)
82 __direct_map_size = 0xfff00000UL - __direct_map_base;
84 struct pci_controller *hose = dev->sysdata;
85 struct pci_iommu_arena *pci = hose->sg_pci;
86 if (pci && pci->dma_base + pci->size >= 0xfff00000UL)
87 pci->size = 0xfff00000UL - pci->dma_base;
91 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693, quirk_cypress);
93 /* Called for each device after PCI setup is done. */
95 pcibios_fixup_final(struct pci_dev *dev)
97 unsigned int class = dev->class >> 8;
99 if (class == PCI_CLASS_BRIDGE_ISA || class == PCI_CLASS_BRIDGE_EISA) {
100 dev->dma_mask = MAX_ISA_DMA_ADDRESS - 1;
104 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_final);
106 /* Just declaring that the power-of-ten prefixes are actually the
107 power-of-two ones doesn't make it true :) */
113 pcibios_align_resource(void *data, struct resource *res,
114 resource_size_t size, resource_size_t align)
116 struct pci_dev *dev = data;
117 struct pci_controller *hose = dev->sysdata;
118 unsigned long alignto;
119 resource_size_t start = res->start;
121 if (res->flags & IORESOURCE_IO) {
122 /* Make sure we start at our min on all hoses */
123 if (start - hose->io_space->start < PCIBIOS_MIN_IO)
124 start = PCIBIOS_MIN_IO + hose->io_space->start;
127 * Put everything into 0x00-0xff region modulo 0x400
130 start = (start + 0x3ff) & ~0x3ff;
132 else if (res->flags & IORESOURCE_MEM) {
133 /* Make sure we start at our min on all hoses */
134 if (start - hose->mem_space->start < PCIBIOS_MIN_MEM)
135 start = PCIBIOS_MIN_MEM + hose->mem_space->start;
138 * The following holds at least for the Low Cost
139 * Alpha implementation of the PCI interface:
141 * In sparse memory address space, the first
142 * octant (16MB) of every 128MB segment is
143 * aliased to the very first 16 MB of the
144 * address space (i.e., it aliases the ISA
145 * memory address space). Thus, we try to
146 * avoid allocating PCI devices in that range.
147 * Can be allocated in 2nd-7th octant only.
148 * Devices that need more than 112MB of
149 * address space must be accessed through
150 * dense memory space only!
153 /* Align to multiple of size of minimum base. */
154 alignto = max(0x1000UL, align);
155 start = ALIGN(start, alignto);
156 if (hose->sparse_mem_base && size <= 7 * 16*MB) {
157 if (((start / (16*MB)) & 0x7) == 0) {
158 start &= ~(128*MB - 1);
160 start = ALIGN(start, alignto);
162 if (start/(128*MB) != (start + size - 1)/(128*MB)) {
163 start &= ~(128*MB - 1);
164 start += (128 + 16)*MB;
165 start = ALIGN(start, alignto);
179 if (alpha_mv.init_pci)
184 subsys_initcall(pcibios_init);
187 pcibios_setup(char *str)
192 #ifdef ALPHA_RESTORE_SRM_SETUP
193 static struct pdev_srm_saved_conf *srm_saved_configs;
196 pdev_save_srm_config(struct pci_dev *dev)
198 struct pdev_srm_saved_conf *tmp;
199 static int printed = 0;
201 if (!alpha_using_srm || pci_probe_only)
205 printk(KERN_INFO "pci: enabling save/restore of SRM state\n");
209 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
211 printk(KERN_ERR "%s: kmalloc() failed!\n", __func__);
214 tmp->next = srm_saved_configs;
219 srm_saved_configs = tmp;
223 pci_restore_srm_config(void)
225 struct pdev_srm_saved_conf *tmp;
227 /* No need to restore if probed only. */
231 /* Restore SRM config. */
232 for (tmp = srm_saved_configs; tmp; tmp = tmp->next) {
233 pci_restore_state(tmp->dev);
239 pcibios_fixup_resource(struct resource *res, struct resource *root)
241 res->start += root->start;
242 res->end += root->start;
246 pcibios_fixup_device_resources(struct pci_dev *dev, struct pci_bus *bus)
248 /* Update device resources. */
249 struct pci_controller *hose = (struct pci_controller *)bus->sysdata;
252 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
253 if (!dev->resource[i].start)
255 if (dev->resource[i].flags & IORESOURCE_IO)
256 pcibios_fixup_resource(&dev->resource[i],
258 else if (dev->resource[i].flags & IORESOURCE_MEM)
259 pcibios_fixup_resource(&dev->resource[i],
265 pcibios_fixup_bus(struct pci_bus *bus)
267 /* Propagate hose info into the subordinate devices. */
269 struct pci_controller *hose = bus->sysdata;
270 struct pci_dev *dev = bus->self;
275 u32 sg_base = hose->sg_pci ? hose->sg_pci->dma_base : ~0;
278 bus->resource[0] = hose->io_space;
279 bus->resource[1] = hose->mem_space;
281 /* Adjust hose mem_space limit to prevent PCI allocations
282 in the iommu windows. */
283 pci_mem_end = min((u32)__direct_map_base, sg_base) - 1;
284 end = hose->mem_space->start + pci_mem_end;
285 if (hose->mem_space->end > end)
286 hose->mem_space->end = end;
287 } else if (pci_probe_only &&
288 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
289 pci_read_bridge_bases(bus);
290 pcibios_fixup_device_resources(dev, bus);
293 list_for_each_entry(dev, &bus->devices, bus_list) {
294 pdev_save_srm_config(dev);
295 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
296 pcibios_fixup_device_resources(dev, bus);
301 pcibios_update_irq(struct pci_dev *dev, int irq)
303 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
306 /* Most Alphas have straight-forward swizzling needs. */
309 common_swizzle(struct pci_dev *dev, u8 *pinp)
313 while (dev->bus->parent) {
314 pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
315 /* Move up the chain of bridges. */
316 dev = dev->bus->self;
320 /* The slot is the slot of the last bridge. */
321 return PCI_SLOT(dev->devfn);
325 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
326 struct resource *res)
328 struct pci_controller *hose = (struct pci_controller *)dev->sysdata;
329 unsigned long offset = 0;
331 if (res->flags & IORESOURCE_IO)
332 offset = hose->io_space->start;
333 else if (res->flags & IORESOURCE_MEM)
334 offset = hose->mem_space->start;
336 region->start = res->start - offset;
337 region->end = res->end - offset;
340 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
341 struct pci_bus_region *region)
343 struct pci_controller *hose = (struct pci_controller *)dev->sysdata;
344 unsigned long offset = 0;
346 if (res->flags & IORESOURCE_IO)
347 offset = hose->io_space->start;
348 else if (res->flags & IORESOURCE_MEM)
349 offset = hose->mem_space->start;
351 res->start = region->start + offset;
352 res->end = region->end + offset;
355 #ifdef CONFIG_HOTPLUG
356 EXPORT_SYMBOL(pcibios_resource_to_bus);
357 EXPORT_SYMBOL(pcibios_bus_to_resource);
361 pcibios_enable_device(struct pci_dev *dev, int mask)
363 return pci_enable_resources(dev, mask);
367 * If we set up a device for bus mastering, we need to check the latency
368 * timer as certain firmware forgets to set it properly, as seen
369 * on SX164 and LX164 with SRM.
372 pcibios_set_master(struct pci_dev *dev)
375 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
376 if (lat >= 16) return;
377 printk("PCI: Setting latency timer of device %s to 64\n",
379 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
383 pcibios_claim_one_bus(struct pci_bus *b)
386 struct pci_bus *child_bus;
388 list_for_each_entry(dev, &b->devices, bus_list) {
391 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
392 struct resource *r = &dev->resource[i];
394 if (r->parent || !r->start || !r->flags)
396 if (pci_probe_only || (r->flags & IORESOURCE_PCI_FIXED))
397 pci_claim_resource(dev, i);
401 list_for_each_entry(child_bus, &b->children, node)
402 pcibios_claim_one_bus(child_bus);
406 pcibios_claim_console_setup(void)
410 list_for_each_entry(b, &pci_root_buses, node)
411 pcibios_claim_one_bus(b);
415 common_init_pci(void)
417 struct pci_controller *hose;
420 int need_domain_info = 0;
422 /* Scan all of the recorded PCI controllers. */
423 for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
424 bus = pci_scan_bus(next_busno, alpha_mv.pci_ops, hose);
426 hose->need_domain_info = need_domain_info;
427 next_busno = bus->subordinate + 1;
428 /* Don't allow 8-bit bus number overflow inside the hose -
429 reserve some space for bridges. */
430 if (next_busno > 224) {
432 need_domain_info = 1;
436 pcibios_claim_console_setup();
438 pci_assign_unassigned_resources();
439 pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq);
443 struct pci_controller * __init
444 alloc_pci_controller(void)
446 struct pci_controller *hose;
448 hose = alloc_bootmem(sizeof(*hose));
451 hose_tail = &hose->next;
456 struct resource * __init
459 struct resource *res;
461 res = alloc_bootmem(sizeof(*res));
467 /* Provide information on locations of various I/O regions in physical
468 memory. Do this on a per-card basis so that we choose the right hose. */
471 sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
473 struct pci_controller *hose;
476 /* from hose or from bus.devfn */
477 if (which & IOBASE_FROM_HOSE) {
478 for(hose = hose_head; hose; hose = hose->next)
479 if (hose->index == bus) break;
480 if (!hose) return -ENODEV;
482 /* Special hook for ISA access. */
483 if (bus == 0 && dfn == 0) {
486 dev = pci_get_bus_and_slot(bus, dfn);
494 switch (which & ~IOBASE_FROM_HOSE) {
497 case IOBASE_SPARSE_MEM:
498 return hose->sparse_mem_base;
499 case IOBASE_DENSE_MEM:
500 return hose->dense_mem_base;
501 case IOBASE_SPARSE_IO:
502 return hose->sparse_io_base;
503 case IOBASE_DENSE_IO:
504 return hose->dense_io_base;
505 case IOBASE_ROOT_BUS:
506 return hose->bus->number;
512 /* Create an __iomem token from a PCI BAR. Copied from lib/iomap.c with
513 no changes, since we don't want the other things in that object file. */
515 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
517 resource_size_t start = pci_resource_start(dev, bar);
518 resource_size_t len = pci_resource_len(dev, bar);
519 unsigned long flags = pci_resource_flags(dev, bar);
523 if (maxlen && len > maxlen)
525 if (flags & IORESOURCE_IO)
526 return ioport_map(start, len);
527 if (flags & IORESOURCE_MEM) {
528 /* Not checking IORESOURCE_CACHEABLE because alpha does
529 not distinguish between ioremap and ioremap_nocache. */
530 return ioremap(start, len);
535 /* Destroy that token. Not copied from lib/iomap.c. */
537 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
543 EXPORT_SYMBOL(pci_iomap);
544 EXPORT_SYMBOL(pci_iounmap);
546 /* FIXME: Some boxes have multiple ISA bridges! */
547 struct pci_dev *isa_bridge;
548 EXPORT_SYMBOL(isa_bridge);