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 Notorious Cy82C693 chip. */
76 /* The generic legacy mode IDE fixup in drivers/pci/probe.c
77 doesn't work correctly with the Cypress IDE controller as
78 it has non-standard register layout. Fix that. */
79 if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE) {
80 dev->resource[2].start = dev->resource[3].start = 0;
81 dev->resource[2].end = dev->resource[3].end = 0;
82 dev->resource[2].flags = dev->resource[3].flags = 0;
83 if (PCI_FUNC(dev->devfn) == 2) {
84 dev->resource[0].start = 0x170;
85 dev->resource[0].end = 0x177;
86 dev->resource[1].start = 0x376;
87 dev->resource[1].end = 0x376;
91 /* The Cypress bridge responds on the PCI bus in the address range
92 0xffff0000-0xffffffff (conventional x86 BIOS ROM). There is no
93 way to turn this off. The bridge also supports several extended
94 BIOS ranges (disabled after power-up), and some consoles do turn
95 them on. So if we use a large direct-map window, or a large SG
96 window, we must avoid the entire 0xfff00000-0xffffffff region. */
97 if (dev->class >> 8 == PCI_CLASS_BRIDGE_ISA) {
98 if (__direct_map_base + __direct_map_size >= 0xfff00000UL)
99 __direct_map_size = 0xfff00000UL - __direct_map_base;
101 struct pci_controller *hose = dev->sysdata;
102 struct pci_iommu_arena *pci = hose->sg_pci;
103 if (pci && pci->dma_base + pci->size >= 0xfff00000UL)
104 pci->size = 0xfff00000UL - pci->dma_base;
108 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693, quirk_cypress);
110 /* Called for each device after PCI setup is done. */
112 pcibios_fixup_final(struct pci_dev *dev)
114 unsigned int class = dev->class >> 8;
116 if (class == PCI_CLASS_BRIDGE_ISA || class == PCI_CLASS_BRIDGE_EISA) {
117 dev->dma_mask = MAX_ISA_DMA_ADDRESS - 1;
121 DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, pcibios_fixup_final);
123 /* Just declaring that the power-of-ten prefixes are actually the
124 power-of-two ones doesn't make it true :) */
130 pcibios_align_resource(void *data, struct resource *res,
131 resource_size_t size, resource_size_t align)
133 struct pci_dev *dev = data;
134 struct pci_controller *hose = dev->sysdata;
135 unsigned long alignto;
136 resource_size_t start = res->start;
138 if (res->flags & IORESOURCE_IO) {
139 /* Make sure we start at our min on all hoses */
140 if (start - hose->io_space->start < PCIBIOS_MIN_IO)
141 start = PCIBIOS_MIN_IO + hose->io_space->start;
144 * Put everything into 0x00-0xff region modulo 0x400
147 start = (start + 0x3ff) & ~0x3ff;
149 else if (res->flags & IORESOURCE_MEM) {
150 /* Make sure we start at our min on all hoses */
151 if (start - hose->mem_space->start < PCIBIOS_MIN_MEM)
152 start = PCIBIOS_MIN_MEM + hose->mem_space->start;
155 * The following holds at least for the Low Cost
156 * Alpha implementation of the PCI interface:
158 * In sparse memory address space, the first
159 * octant (16MB) of every 128MB segment is
160 * aliased to the very first 16 MB of the
161 * address space (i.e., it aliases the ISA
162 * memory address space). Thus, we try to
163 * avoid allocating PCI devices in that range.
164 * Can be allocated in 2nd-7th octant only.
165 * Devices that need more than 112MB of
166 * address space must be accessed through
167 * dense memory space only!
170 /* Align to multiple of size of minimum base. */
171 alignto = max(0x1000UL, align);
172 start = ALIGN(start, alignto);
173 if (hose->sparse_mem_base && size <= 7 * 16*MB) {
174 if (((start / (16*MB)) & 0x7) == 0) {
175 start &= ~(128*MB - 1);
177 start = ALIGN(start, alignto);
179 if (start/(128*MB) != (start + size - 1)/(128*MB)) {
180 start &= ~(128*MB - 1);
181 start += (128 + 16)*MB;
182 start = ALIGN(start, alignto);
196 if (alpha_mv.init_pci)
201 subsys_initcall(pcibios_init);
204 pcibios_setup(char *str)
209 #ifdef ALPHA_RESTORE_SRM_SETUP
210 static struct pdev_srm_saved_conf *srm_saved_configs;
213 pdev_save_srm_config(struct pci_dev *dev)
215 struct pdev_srm_saved_conf *tmp;
216 static int printed = 0;
218 if (!alpha_using_srm || pci_probe_only)
222 printk(KERN_INFO "pci: enabling save/restore of SRM state\n");
226 tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
228 printk(KERN_ERR "%s: kmalloc() failed!\n", __func__);
231 tmp->next = srm_saved_configs;
236 srm_saved_configs = tmp;
240 pci_restore_srm_config(void)
242 struct pdev_srm_saved_conf *tmp;
244 /* No need to restore if probed only. */
248 /* Restore SRM config. */
249 for (tmp = srm_saved_configs; tmp; tmp = tmp->next) {
250 pci_restore_state(tmp->dev);
256 pcibios_fixup_resource(struct resource *res, struct resource *root)
258 res->start += root->start;
259 res->end += root->start;
263 pcibios_fixup_device_resources(struct pci_dev *dev, struct pci_bus *bus)
265 /* Update device resources. */
266 struct pci_controller *hose = (struct pci_controller *)bus->sysdata;
269 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
270 if (!dev->resource[i].start)
272 if (dev->resource[i].flags & IORESOURCE_IO)
273 pcibios_fixup_resource(&dev->resource[i],
275 else if (dev->resource[i].flags & IORESOURCE_MEM)
276 pcibios_fixup_resource(&dev->resource[i],
282 pcibios_fixup_bus(struct pci_bus *bus)
284 /* Propagate hose info into the subordinate devices. */
286 struct pci_controller *hose = bus->sysdata;
287 struct pci_dev *dev = bus->self;
292 u32 sg_base = hose->sg_pci ? hose->sg_pci->dma_base : ~0;
295 bus->resource[0] = hose->io_space;
296 bus->resource[1] = hose->mem_space;
298 /* Adjust hose mem_space limit to prevent PCI allocations
299 in the iommu windows. */
300 pci_mem_end = min((u32)__direct_map_base, sg_base) - 1;
301 end = hose->mem_space->start + pci_mem_end;
302 if (hose->mem_space->end > end)
303 hose->mem_space->end = end;
304 } else if (pci_probe_only &&
305 (dev->class >> 8) == PCI_CLASS_BRIDGE_PCI) {
306 pci_read_bridge_bases(bus);
307 pcibios_fixup_device_resources(dev, bus);
310 list_for_each_entry(dev, &bus->devices, bus_list) {
311 pdev_save_srm_config(dev);
312 if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
313 pcibios_fixup_device_resources(dev, bus);
318 pcibios_update_irq(struct pci_dev *dev, int irq)
320 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
324 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
325 struct resource *res)
327 struct pci_controller *hose = (struct pci_controller *)dev->sysdata;
328 unsigned long offset = 0;
330 if (res->flags & IORESOURCE_IO)
331 offset = hose->io_space->start;
332 else if (res->flags & IORESOURCE_MEM)
333 offset = hose->mem_space->start;
335 region->start = res->start - offset;
336 region->end = res->end - offset;
339 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
340 struct pci_bus_region *region)
342 struct pci_controller *hose = (struct pci_controller *)dev->sysdata;
343 unsigned long offset = 0;
345 if (res->flags & IORESOURCE_IO)
346 offset = hose->io_space->start;
347 else if (res->flags & IORESOURCE_MEM)
348 offset = hose->mem_space->start;
350 res->start = region->start + offset;
351 res->end = region->end + offset;
354 #ifdef CONFIG_HOTPLUG
355 EXPORT_SYMBOL(pcibios_resource_to_bus);
356 EXPORT_SYMBOL(pcibios_bus_to_resource);
360 pcibios_enable_device(struct pci_dev *dev, int mask)
362 return pci_enable_resources(dev, mask);
366 * If we set up a device for bus mastering, we need to check the latency
367 * timer as certain firmware forgets to set it properly, as seen
368 * on SX164 and LX164 with SRM.
371 pcibios_set_master(struct pci_dev *dev)
374 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
375 if (lat >= 16) return;
376 printk("PCI: Setting latency timer of device %s to 64\n",
378 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
382 pcibios_claim_one_bus(struct pci_bus *b)
385 struct pci_bus *child_bus;
387 list_for_each_entry(dev, &b->devices, bus_list) {
390 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
391 struct resource *r = &dev->resource[i];
393 if (r->parent || !r->start || !r->flags)
395 if (pci_probe_only || (r->flags & IORESOURCE_PCI_FIXED))
396 pci_claim_resource(dev, i);
400 list_for_each_entry(child_bus, &b->children, node)
401 pcibios_claim_one_bus(child_bus);
405 pcibios_claim_console_setup(void)
409 list_for_each_entry(b, &pci_root_buses, node)
410 pcibios_claim_one_bus(b);
414 common_init_pci(void)
416 struct pci_controller *hose;
419 int need_domain_info = 0;
421 /* Scan all of the recorded PCI controllers. */
422 for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
423 bus = pci_scan_bus(next_busno, alpha_mv.pci_ops, hose);
425 hose->need_domain_info = need_domain_info;
426 next_busno = bus->subordinate + 1;
427 /* Don't allow 8-bit bus number overflow inside the hose -
428 reserve some space for bridges. */
429 if (next_busno > 224) {
431 need_domain_info = 1;
435 pcibios_claim_console_setup();
437 pci_assign_unassigned_resources();
438 pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq);
442 struct pci_controller * __init
443 alloc_pci_controller(void)
445 struct pci_controller *hose;
447 hose = alloc_bootmem(sizeof(*hose));
450 hose_tail = &hose->next;
455 struct resource * __init
458 struct resource *res;
460 res = alloc_bootmem(sizeof(*res));
466 /* Provide information on locations of various I/O regions in physical
467 memory. Do this on a per-card basis so that we choose the right hose. */
470 sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
472 struct pci_controller *hose;
475 /* from hose or from bus.devfn */
476 if (which & IOBASE_FROM_HOSE) {
477 for(hose = hose_head; hose; hose = hose->next)
478 if (hose->index == bus) break;
479 if (!hose) return -ENODEV;
481 /* Special hook for ISA access. */
482 if (bus == 0 && dfn == 0) {
485 dev = pci_get_bus_and_slot(bus, dfn);
493 switch (which & ~IOBASE_FROM_HOSE) {
496 case IOBASE_SPARSE_MEM:
497 return hose->sparse_mem_base;
498 case IOBASE_DENSE_MEM:
499 return hose->dense_mem_base;
500 case IOBASE_SPARSE_IO:
501 return hose->sparse_io_base;
502 case IOBASE_DENSE_IO:
503 return hose->dense_io_base;
504 case IOBASE_ROOT_BUS:
505 return hose->bus->number;
511 /* Create an __iomem token from a PCI BAR. Copied from lib/iomap.c with
512 no changes, since we don't want the other things in that object file. */
514 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
516 resource_size_t start = pci_resource_start(dev, bar);
517 resource_size_t len = pci_resource_len(dev, bar);
518 unsigned long flags = pci_resource_flags(dev, bar);
522 if (maxlen && len > maxlen)
524 if (flags & IORESOURCE_IO)
525 return ioport_map(start, len);
526 if (flags & IORESOURCE_MEM) {
527 /* Not checking IORESOURCE_CACHEABLE because alpha does
528 not distinguish between ioremap and ioremap_nocache. */
529 return ioremap(start, len);
534 /* Destroy that token. Not copied from lib/iomap.c. */
536 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
542 EXPORT_SYMBOL(pci_iomap);
543 EXPORT_SYMBOL(pci_iounmap);
545 /* FIXME: Some boxes have multiple ISA bridges! */
546 struct pci_dev *isa_bridge;
547 EXPORT_SYMBOL(isa_bridge);