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/config.h>
16 #include <linux/string.h>
17 #include <linux/pci.h>
18 #include <linux/init.h>
19 #include <linux/ioport.h>
20 #include <linux/kernel.h>
21 #include <linux/bootmem.h>
22 #include <linux/module.h>
23 #include <linux/cache.h>
24 #include <linux/slab.h>
25 #include <asm/machvec.h>
32 * Some string constants used by the various core logics.
35 const char *const pci_io_names[] = {
36 "PCI IO bus 0", "PCI IO bus 1", "PCI IO bus 2", "PCI IO bus 3",
37 "PCI IO bus 4", "PCI IO bus 5", "PCI IO bus 6", "PCI IO bus 7"
40 const char *const pci_mem_names[] = {
41 "PCI mem bus 0", "PCI mem bus 1", "PCI mem bus 2", "PCI mem bus 3",
42 "PCI mem bus 4", "PCI mem bus 5", "PCI mem bus 6", "PCI mem bus 7"
45 const char pci_hae0_name[] = "HAE0";
47 /* Indicate whether we respect the PCI setup left by console. */
49 * Make this long-lived so that we know when shutting down
50 * whether we probed only or not.
55 * The PCI controller list.
58 struct pci_controller *hose_head, **hose_tail = &hose_head;
59 struct pci_controller *pci_isa_hose;
66 quirk_isa_bridge(struct pci_dev *dev)
68 dev->class = PCI_CLASS_BRIDGE_ISA << 8;
70 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82378, quirk_isa_bridge);
73 quirk_cypress(struct pci_dev *dev)
75 /* The Notorious Cy82C693 chip. */
77 /* The Cypress IDE controller doesn't support native mode, but it
78 has programmable addresses of IDE command/control registers.
79 This violates PCI specifications, confuses the IDE subsystem and
80 causes resource conflicts between the primary HD_CMD register and
81 the floppy controller. Ugh. Fix that. */
82 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE) {
83 dev->resource[0].flags = 0;
84 dev->resource[1].flags = 0;
87 /* The Cypress bridge responds on the PCI bus in the address range
88 0xffff0000-0xffffffff (conventional x86 BIOS ROM). There is no
89 way to turn this off. The bridge also supports several extended
90 BIOS ranges (disabled after power-up), and some consoles do turn
91 them on. So if we use a large direct-map window, or a large SG
92 window, we must avoid the entire 0xfff00000-0xffffffff region. */
93 else if (dev->class >> 8 == PCI_CLASS_BRIDGE_ISA) {
94 if (__direct_map_base + __direct_map_size >= 0xfff00000UL)
95 __direct_map_size = 0xfff00000UL - __direct_map_base;
97 struct pci_controller *hose = dev->sysdata;
98 struct pci_iommu_arena *pci = hose->sg_pci;
99 if (pci && pci->dma_base + pci->size >= 0xfff00000UL)
100 pci->size = 0xfff00000UL - pci->dma_base;
104 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693, quirk_cypress);
106 /* Called for each device after PCI setup is done. */
108 pcibios_fixup_final(struct pci_dev *dev)
110 unsigned int class = dev->class >> 8;
112 if (class == PCI_CLASS_BRIDGE_ISA || class == PCI_CLASS_BRIDGE_EISA) {
113 dev->dma_mask = MAX_ISA_DMA_ADDRESS - 1;
117 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_final);
119 /* Just declaring that the power-of-ten prefixes are actually the
120 power-of-two ones doesn't make it true :) */
126 pcibios_align_resource(void *data, struct resource *res,
127 unsigned long size, unsigned long align)
129 struct pci_dev *dev = data;
130 struct pci_controller *hose = dev->sysdata;
131 unsigned long alignto;
132 unsigned long start = res->start;
134 if (res->flags & IORESOURCE_IO) {
135 /* Make sure we start at our min on all hoses */
136 if (start - hose->io_space->start < PCIBIOS_MIN_IO)
137 start = PCIBIOS_MIN_IO + hose->io_space->start;
140 * Put everything into 0x00-0xff region modulo 0x400
143 start = (start + 0x3ff) & ~0x3ff;
145 else if (res->flags & IORESOURCE_MEM) {
146 /* Make sure we start at our min on all hoses */
147 if (start - hose->mem_space->start < PCIBIOS_MIN_MEM)
148 start = PCIBIOS_MIN_MEM + hose->mem_space->start;
151 * The following holds at least for the Low Cost
152 * Alpha implementation of the PCI interface:
154 * In sparse memory address space, the first
155 * octant (16MB) of every 128MB segment is
156 * aliased to the very first 16 MB of the
157 * address space (i.e., it aliases the ISA
158 * memory address space). Thus, we try to
159 * avoid allocating PCI devices in that range.
160 * Can be allocated in 2nd-7th octant only.
161 * Devices that need more than 112MB of
162 * address space must be accessed through
163 * dense memory space only!
166 /* Align to multiple of size of minimum base. */
167 alignto = max(0x1000UL, align);
168 start = ALIGN(start, alignto);
169 if (hose->sparse_mem_base && size <= 7 * 16*MB) {
170 if (((start / (16*MB)) & 0x7) == 0) {
171 start &= ~(128*MB - 1);
173 start = ALIGN(start, alignto);
175 if (start/(128*MB) != (start + size - 1)/(128*MB)) {
176 start &= ~(128*MB - 1);
177 start += (128 + 16)*MB;
178 start = ALIGN(start, alignto);
192 if (alpha_mv.init_pci)
197 subsys_initcall(pcibios_init);
200 pcibios_setup(char *str)
205 #ifdef ALPHA_RESTORE_SRM_SETUP
206 static struct pdev_srm_saved_conf *srm_saved_configs;
209 pdev_save_srm_config(struct pci_dev *dev)
211 struct pdev_srm_saved_conf *tmp;
212 static int printed = 0;
214 if (!alpha_using_srm || pci_probe_only)
218 printk(KERN_INFO "pci: enabling save/restore of SRM state\n");
222 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
224 printk(KERN_ERR "%s: kmalloc() failed!\n", __FUNCTION__);
227 tmp->next = srm_saved_configs;
232 srm_saved_configs = tmp;
236 pci_restore_srm_config(void)
238 struct pdev_srm_saved_conf *tmp;
240 /* No need to restore if probed only. */
244 /* Restore SRM config. */
245 for (tmp = srm_saved_configs; tmp; tmp = tmp->next) {
246 pci_restore_state(tmp->dev);
252 pcibios_fixup_resource(struct resource *res, struct resource *root)
254 res->start += root->start;
255 res->end += root->start;
259 pcibios_fixup_device_resources(struct pci_dev *dev, struct pci_bus *bus)
261 /* Update device resources. */
262 struct pci_controller *hose = (struct pci_controller *)bus->sysdata;
265 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
266 if (!dev->resource[i].start)
268 if (dev->resource[i].flags & IORESOURCE_IO)
269 pcibios_fixup_resource(&dev->resource[i],
271 else if (dev->resource[i].flags & IORESOURCE_MEM)
272 pcibios_fixup_resource(&dev->resource[i],
278 pcibios_fixup_bus(struct pci_bus *bus)
280 /* Propagate hose info into the subordinate devices. */
282 struct pci_controller *hose = bus->sysdata;
283 struct pci_dev *dev = bus->self;
288 u32 sg_base = hose->sg_pci ? hose->sg_pci->dma_base : ~0;
291 bus->resource[0] = hose->io_space;
292 bus->resource[1] = hose->mem_space;
294 /* Adjust hose mem_space limit to prevent PCI allocations
295 in the iommu windows. */
296 pci_mem_end = min((u32)__direct_map_base, sg_base) - 1;
297 end = hose->mem_space->start + pci_mem_end;
298 if (hose->mem_space->end > end)
299 hose->mem_space->end = end;
300 } else if (pci_probe_only &&
301 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
302 pci_read_bridge_bases(bus);
303 pcibios_fixup_device_resources(dev, bus);
306 list_for_each_entry(dev, &bus->devices, bus_list) {
307 pdev_save_srm_config(dev);
308 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
309 pcibios_fixup_device_resources(dev, bus);
314 pcibios_update_irq(struct pci_dev *dev, int irq)
316 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
319 /* Most Alphas have straight-forward swizzling needs. */
322 common_swizzle(struct pci_dev *dev, u8 *pinp)
326 while (dev->bus->parent) {
327 pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
328 /* Move up the chain of bridges. */
329 dev = dev->bus->self;
333 /* The slot is the slot of the last bridge. */
334 return PCI_SLOT(dev->devfn);
338 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
339 struct resource *res)
341 struct pci_controller *hose = (struct pci_controller *)dev->sysdata;
342 unsigned long offset = 0;
344 if (res->flags & IORESOURCE_IO)
345 offset = hose->io_space->start;
346 else if (res->flags & IORESOURCE_MEM)
347 offset = hose->mem_space->start;
349 region->start = res->start - offset;
350 region->end = res->end - offset;
353 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
354 struct pci_bus_region *region)
356 struct pci_controller *hose = (struct pci_controller *)dev->sysdata;
357 unsigned long offset = 0;
359 if (res->flags & IORESOURCE_IO)
360 offset = hose->io_space->start;
361 else if (res->flags & IORESOURCE_MEM)
362 offset = hose->mem_space->start;
364 res->start = region->start + offset;
365 res->end = region->end + offset;
368 #ifdef CONFIG_HOTPLUG
369 EXPORT_SYMBOL(pcibios_resource_to_bus);
370 EXPORT_SYMBOL(pcibios_bus_to_resource);
374 pcibios_enable_device(struct pci_dev *dev, int mask)
379 pci_read_config_word(dev, PCI_COMMAND, &cmd);
382 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
383 struct resource *res = &dev->resource[i];
385 if (res->flags & IORESOURCE_IO)
386 cmd |= PCI_COMMAND_IO;
387 else if (res->flags & IORESOURCE_MEM)
388 cmd |= PCI_COMMAND_MEMORY;
392 printk(KERN_DEBUG "PCI: Enabling device: (%s), cmd %x\n",
394 /* Enable the appropriate bits in the PCI command register. */
395 pci_write_config_word(dev, PCI_COMMAND, cmd);
401 * If we set up a device for bus mastering, we need to check the latency
402 * timer as certain firmware forgets to set it properly, as seen
403 * on SX164 and LX164 with SRM.
406 pcibios_set_master(struct pci_dev *dev)
409 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
410 if (lat >= 16) return;
411 printk("PCI: Setting latency timer of device %s to 64\n",
413 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
417 pcibios_claim_one_bus(struct pci_bus *b)
420 struct pci_bus *child_bus;
422 list_for_each_entry(dev, &b->devices, bus_list) {
425 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
426 struct resource *r = &dev->resource[i];
428 if (r->parent || !r->start || !r->flags)
430 pci_claim_resource(dev, i);
434 list_for_each_entry(child_bus, &b->children, node)
435 pcibios_claim_one_bus(child_bus);
439 pcibios_claim_console_setup(void)
443 list_for_each_entry(b, &pci_root_buses, node)
444 pcibios_claim_one_bus(b);
448 common_init_pci(void)
450 struct pci_controller *hose;
453 int need_domain_info = 0;
455 /* Scan all of the recorded PCI controllers. */
456 for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
457 bus = pci_scan_bus(next_busno, alpha_mv.pci_ops, hose);
459 hose->need_domain_info = need_domain_info;
460 next_busno = bus->subordinate + 1;
461 /* Don't allow 8-bit bus number overflow inside the hose -
462 reserve some space for bridges. */
463 if (next_busno > 224) {
465 need_domain_info = 1;
470 pcibios_claim_console_setup();
472 pci_assign_unassigned_resources();
473 pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq);
477 struct pci_controller * __init
478 alloc_pci_controller(void)
480 struct pci_controller *hose;
482 hose = alloc_bootmem(sizeof(*hose));
485 hose_tail = &hose->next;
490 struct resource * __init
493 struct resource *res;
495 res = alloc_bootmem(sizeof(*res));
501 /* Provide information on locations of various I/O regions in physical
502 memory. Do this on a per-card basis so that we choose the right hose. */
505 sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
507 struct pci_controller *hose;
510 /* from hose or from bus.devfn */
511 if (which & IOBASE_FROM_HOSE) {
512 for(hose = hose_head; hose; hose = hose->next)
513 if (hose->index == bus) break;
514 if (!hose) return -ENODEV;
516 /* Special hook for ISA access. */
517 if (bus == 0 && dfn == 0) {
520 dev = pci_find_slot(bus, dfn);
527 switch (which & ~IOBASE_FROM_HOSE) {
530 case IOBASE_SPARSE_MEM:
531 return hose->sparse_mem_base;
532 case IOBASE_DENSE_MEM:
533 return hose->dense_mem_base;
534 case IOBASE_SPARSE_IO:
535 return hose->sparse_io_base;
536 case IOBASE_DENSE_IO:
537 return hose->dense_io_base;
538 case IOBASE_ROOT_BUS:
539 return hose->bus->number;
545 /* Create an __iomem token from a PCI BAR. Copied from lib/iomap.c with
546 no changes, since we don't want the other things in that object file. */
548 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
550 unsigned long start = pci_resource_start(dev, bar);
551 unsigned long len = pci_resource_len(dev, bar);
552 unsigned long flags = pci_resource_flags(dev, bar);
556 if (maxlen && len > maxlen)
558 if (flags & IORESOURCE_IO)
559 return ioport_map(start, len);
560 if (flags & IORESOURCE_MEM) {
561 /* Not checking IORESOURCE_CACHEABLE because alpha does
562 not distinguish between ioremap and ioremap_nocache. */
563 return ioremap(start, len);
568 /* Destroy that token. Not copied from lib/iomap.c. */
570 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
576 EXPORT_SYMBOL(pci_iomap);
577 EXPORT_SYMBOL(pci_iounmap);