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);
323 /* Most Alphas have straight-forward swizzling needs. */
326 common_swizzle(struct pci_dev *dev, u8 *pinp)
330 while (dev->bus->parent) {
331 pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
332 /* Move up the chain of bridges. */
333 dev = dev->bus->self;
337 /* The slot is the slot of the last bridge. */
338 return PCI_SLOT(dev->devfn);
342 pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
343 struct resource *res)
345 struct pci_controller *hose = (struct pci_controller *)dev->sysdata;
346 unsigned long offset = 0;
348 if (res->flags & IORESOURCE_IO)
349 offset = hose->io_space->start;
350 else if (res->flags & IORESOURCE_MEM)
351 offset = hose->mem_space->start;
353 region->start = res->start - offset;
354 region->end = res->end - offset;
357 void pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
358 struct pci_bus_region *region)
360 struct pci_controller *hose = (struct pci_controller *)dev->sysdata;
361 unsigned long offset = 0;
363 if (res->flags & IORESOURCE_IO)
364 offset = hose->io_space->start;
365 else if (res->flags & IORESOURCE_MEM)
366 offset = hose->mem_space->start;
368 res->start = region->start + offset;
369 res->end = region->end + offset;
372 #ifdef CONFIG_HOTPLUG
373 EXPORT_SYMBOL(pcibios_resource_to_bus);
374 EXPORT_SYMBOL(pcibios_bus_to_resource);
378 pcibios_enable_device(struct pci_dev *dev, int mask)
380 return pci_enable_resources(dev, mask);
384 * If we set up a device for bus mastering, we need to check the latency
385 * timer as certain firmware forgets to set it properly, as seen
386 * on SX164 and LX164 with SRM.
389 pcibios_set_master(struct pci_dev *dev)
392 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
393 if (lat >= 16) return;
394 printk("PCI: Setting latency timer of device %s to 64\n",
396 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64);
400 pcibios_claim_one_bus(struct pci_bus *b)
403 struct pci_bus *child_bus;
405 list_for_each_entry(dev, &b->devices, bus_list) {
408 for (i = 0; i < PCI_NUM_RESOURCES; i++) {
409 struct resource *r = &dev->resource[i];
411 if (r->parent || !r->start || !r->flags)
413 if (pci_probe_only || (r->flags & IORESOURCE_PCI_FIXED))
414 pci_claim_resource(dev, i);
418 list_for_each_entry(child_bus, &b->children, node)
419 pcibios_claim_one_bus(child_bus);
423 pcibios_claim_console_setup(void)
427 list_for_each_entry(b, &pci_root_buses, node)
428 pcibios_claim_one_bus(b);
432 common_init_pci(void)
434 struct pci_controller *hose;
437 int need_domain_info = 0;
439 /* Scan all of the recorded PCI controllers. */
440 for (next_busno = 0, hose = hose_head; hose; hose = hose->next) {
441 bus = pci_scan_bus(next_busno, alpha_mv.pci_ops, hose);
443 hose->need_domain_info = need_domain_info;
444 next_busno = bus->subordinate + 1;
445 /* Don't allow 8-bit bus number overflow inside the hose -
446 reserve some space for bridges. */
447 if (next_busno > 224) {
449 need_domain_info = 1;
453 pcibios_claim_console_setup();
455 pci_assign_unassigned_resources();
456 pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq);
460 struct pci_controller * __init
461 alloc_pci_controller(void)
463 struct pci_controller *hose;
465 hose = alloc_bootmem(sizeof(*hose));
468 hose_tail = &hose->next;
473 struct resource * __init
476 struct resource *res;
478 res = alloc_bootmem(sizeof(*res));
484 /* Provide information on locations of various I/O regions in physical
485 memory. Do this on a per-card basis so that we choose the right hose. */
488 sys_pciconfig_iobase(long which, unsigned long bus, unsigned long dfn)
490 struct pci_controller *hose;
493 /* from hose or from bus.devfn */
494 if (which & IOBASE_FROM_HOSE) {
495 for(hose = hose_head; hose; hose = hose->next)
496 if (hose->index == bus) break;
497 if (!hose) return -ENODEV;
499 /* Special hook for ISA access. */
500 if (bus == 0 && dfn == 0) {
503 dev = pci_get_bus_and_slot(bus, dfn);
511 switch (which & ~IOBASE_FROM_HOSE) {
514 case IOBASE_SPARSE_MEM:
515 return hose->sparse_mem_base;
516 case IOBASE_DENSE_MEM:
517 return hose->dense_mem_base;
518 case IOBASE_SPARSE_IO:
519 return hose->sparse_io_base;
520 case IOBASE_DENSE_IO:
521 return hose->dense_io_base;
522 case IOBASE_ROOT_BUS:
523 return hose->bus->number;
529 /* Create an __iomem token from a PCI BAR. Copied from lib/iomap.c with
530 no changes, since we don't want the other things in that object file. */
532 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
534 resource_size_t start = pci_resource_start(dev, bar);
535 resource_size_t len = pci_resource_len(dev, bar);
536 unsigned long flags = pci_resource_flags(dev, bar);
540 if (maxlen && len > maxlen)
542 if (flags & IORESOURCE_IO)
543 return ioport_map(start, len);
544 if (flags & IORESOURCE_MEM) {
545 /* Not checking IORESOURCE_CACHEABLE because alpha does
546 not distinguish between ioremap and ioremap_nocache. */
547 return ioremap(start, len);
552 /* Destroy that token. Not copied from lib/iomap.c. */
554 void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
560 EXPORT_SYMBOL(pci_iomap);
561 EXPORT_SYMBOL(pci_iounmap);
563 /* FIXME: Some boxes have multiple ISA bridges! */
564 struct pci_dev *isa_bridge;
565 EXPORT_SYMBOL(isa_bridge);