2 * Copyright IBM Corp. 2012
5 * Jan Glauber <jang@linux.vnet.ibm.com>
7 * The System z PCI code is a rewrite from a prototype by
8 * the following people (Kudoz!):
18 #define COMPONENT "zPCI"
19 #define pr_fmt(fmt) COMPONENT ": " fmt
21 #include <linux/kernel.h>
22 #include <linux/slab.h>
23 #include <linux/err.h>
24 #include <linux/export.h>
25 #include <linux/delay.h>
26 #include <linux/irq.h>
27 #include <linux/kernel_stat.h>
28 #include <linux/seq_file.h>
29 #include <linux/pci.h>
30 #include <linux/msi.h>
34 #include <asm/facility.h>
35 #include <asm/pci_insn.h>
36 #include <asm/pci_clp.h>
37 #include <asm/pci_dma.h>
39 #define DEBUG /* enable pr_debug */
41 #define SIC_IRQ_MODE_ALL 0
42 #define SIC_IRQ_MODE_SINGLE 1
44 #define ZPCI_NR_DMA_SPACES 1
45 #define ZPCI_NR_DEVICES CONFIG_PCI_NR_FUNCTIONS
47 /* list of all detected zpci devices */
48 static LIST_HEAD(zpci_list);
49 static DEFINE_SPINLOCK(zpci_list_lock);
51 static void zpci_enable_irq(struct irq_data *data);
52 static void zpci_disable_irq(struct irq_data *data);
54 static struct irq_chip zpci_irq_chip = {
56 .irq_unmask = zpci_enable_irq,
57 .irq_mask = zpci_disable_irq,
60 static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
61 static DEFINE_SPINLOCK(zpci_domain_lock);
63 static struct airq_iv *zpci_aisb_iv;
64 static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];
66 /* Adapter interrupt definitions */
67 static void zpci_irq_handler(struct airq_struct *airq);
69 static struct airq_struct zpci_airq = {
70 .handler = zpci_irq_handler,
75 static DEFINE_SPINLOCK(zpci_iomap_lock);
76 static DECLARE_BITMAP(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
77 struct zpci_iomap_entry *zpci_iomap_start;
78 EXPORT_SYMBOL_GPL(zpci_iomap_start);
80 static struct kmem_cache *zdev_fmb_cache;
82 struct zpci_dev *get_zdev(struct pci_dev *pdev)
84 return (struct zpci_dev *) pdev->sysdata;
87 struct zpci_dev *get_zdev_by_fid(u32 fid)
89 struct zpci_dev *tmp, *zdev = NULL;
91 spin_lock(&zpci_list_lock);
92 list_for_each_entry(tmp, &zpci_list, entry) {
93 if (tmp->fid == fid) {
98 spin_unlock(&zpci_list_lock);
102 static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
104 return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
107 int pci_domain_nr(struct pci_bus *bus)
109 return ((struct zpci_dev *) bus->sysdata)->domain;
111 EXPORT_SYMBOL_GPL(pci_domain_nr);
113 int pci_proc_domain(struct pci_bus *bus)
115 return pci_domain_nr(bus);
117 EXPORT_SYMBOL_GPL(pci_proc_domain);
119 /* Modify PCI: Register adapter interruptions */
120 static int zpci_set_airq(struct zpci_dev *zdev)
122 u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
123 struct zpci_fib *fib;
126 fib = (void *) get_zeroed_page(GFP_KERNEL);
131 fib->sum = 1; /* enable summary notifications */
132 fib->noi = airq_iv_end(zdev->aibv);
133 fib->aibv = (unsigned long) zdev->aibv->vector;
134 fib->aibvo = 0; /* each zdev has its own interrupt vector */
135 fib->aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
136 fib->aisbo = zdev->aisb & 63;
138 rc = zpci_mod_fc(req, fib);
140 free_page((unsigned long) fib);
144 struct mod_pci_args {
151 static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
153 u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
154 struct zpci_fib *fib;
157 /* The FIB must be available even if it's not used */
158 fib = (void *) get_zeroed_page(GFP_KERNEL);
162 fib->pba = args->base;
163 fib->pal = args->limit;
164 fib->iota = args->iota;
165 fib->fmb_addr = args->fmb_addr;
167 rc = zpci_mod_fc(req, fib);
168 free_page((unsigned long) fib);
172 /* Modify PCI: Register I/O address translation parameters */
173 int zpci_register_ioat(struct zpci_dev *zdev, u8 dmaas,
174 u64 base, u64 limit, u64 iota)
176 struct mod_pci_args args = { base, limit, iota, 0 };
178 WARN_ON_ONCE(iota & 0x3fff);
179 args.iota |= ZPCI_IOTA_RTTO_FLAG;
180 return mod_pci(zdev, ZPCI_MOD_FC_REG_IOAT, dmaas, &args);
183 /* Modify PCI: Unregister I/O address translation parameters */
184 int zpci_unregister_ioat(struct zpci_dev *zdev, u8 dmaas)
186 struct mod_pci_args args = { 0, 0, 0, 0 };
188 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_IOAT, dmaas, &args);
191 /* Modify PCI: Unregister adapter interruptions */
192 static int zpci_clear_airq(struct zpci_dev *zdev)
194 struct mod_pci_args args = { 0, 0, 0, 0 };
196 return mod_pci(zdev, ZPCI_MOD_FC_DEREG_INT, 0, &args);
199 /* Modify PCI: Set PCI function measurement parameters */
200 int zpci_fmb_enable_device(struct zpci_dev *zdev)
202 struct mod_pci_args args = { 0, 0, 0, 0 };
207 zdev->fmb = kmem_cache_zalloc(zdev_fmb_cache, GFP_KERNEL);
210 WARN_ON((u64) zdev->fmb & 0xf);
212 args.fmb_addr = virt_to_phys(zdev->fmb);
213 return mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
216 /* Modify PCI: Disable PCI function measurement */
217 int zpci_fmb_disable_device(struct zpci_dev *zdev)
219 struct mod_pci_args args = { 0, 0, 0, 0 };
225 /* Function measurement is disabled if fmb address is zero */
226 rc = mod_pci(zdev, ZPCI_MOD_FC_SET_MEASURE, 0, &args);
228 kmem_cache_free(zdev_fmb_cache, zdev->fmb);
233 #define ZPCI_PCIAS_CFGSPC 15
235 static int zpci_cfg_load(struct zpci_dev *zdev, int offset, u32 *val, u8 len)
237 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
241 rc = zpci_load(&data, req, offset);
243 data = data << ((8 - len) * 8);
244 data = le64_to_cpu(data);
251 static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
253 u64 req = ZPCI_CREATE_REQ(zdev->fh, ZPCI_PCIAS_CFGSPC, len);
257 data = cpu_to_le64(data);
258 data = data >> ((8 - len) * 8);
259 rc = zpci_store(data, req, offset);
263 static int zpci_msi_set_mask_bits(struct msi_desc *msi, u32 mask, u32 flag)
268 if (msi->msi_attrib.is_msix) {
269 offset = msi->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
270 PCI_MSIX_ENTRY_VECTOR_CTRL;
271 msi->masked = readl(msi->mask_base + offset);
272 writel(flag, msi->mask_base + offset);
273 } else if (msi->msi_attrib.maskbit) {
274 pos = (long) msi->mask_base;
275 pci_read_config_dword(msi->dev, pos, &mask_bits);
276 mask_bits &= ~(mask);
277 mask_bits |= flag & mask;
278 pci_write_config_dword(msi->dev, pos, mask_bits);
282 msi->msi_attrib.maskbit = !!flag;
286 static void zpci_enable_irq(struct irq_data *data)
288 struct msi_desc *msi = irq_get_msi_desc(data->irq);
290 zpci_msi_set_mask_bits(msi, 1, 0);
293 static void zpci_disable_irq(struct irq_data *data)
295 struct msi_desc *msi = irq_get_msi_desc(data->irq);
297 zpci_msi_set_mask_bits(msi, 1, 1);
300 void pcibios_fixup_bus(struct pci_bus *bus)
304 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
305 resource_size_t size,
306 resource_size_t align)
311 /* combine single writes by using store-block insn */
312 void __iowrite64_copy(void __iomem *to, const void *from, size_t count)
314 zpci_memcpy_toio(to, from, count);
317 /* Create a virtual mapping cookie for a PCI BAR */
318 void __iomem *pci_iomap(struct pci_dev *pdev, int bar, unsigned long max)
320 struct zpci_dev *zdev = get_zdev(pdev);
324 if ((bar & 7) != bar)
327 idx = zdev->bars[bar].map_idx;
328 spin_lock(&zpci_iomap_lock);
329 zpci_iomap_start[idx].fh = zdev->fh;
330 zpci_iomap_start[idx].bar = bar;
331 spin_unlock(&zpci_iomap_lock);
333 addr = ZPCI_IOMAP_ADDR_BASE | ((u64) idx << 48);
334 return (void __iomem *) addr;
336 EXPORT_SYMBOL_GPL(pci_iomap);
338 void pci_iounmap(struct pci_dev *pdev, void __iomem *addr)
342 idx = (((__force u64) addr) & ~ZPCI_IOMAP_ADDR_BASE) >> 48;
343 spin_lock(&zpci_iomap_lock);
344 zpci_iomap_start[idx].fh = 0;
345 zpci_iomap_start[idx].bar = 0;
346 spin_unlock(&zpci_iomap_lock);
348 EXPORT_SYMBOL_GPL(pci_iounmap);
350 static int pci_read(struct pci_bus *bus, unsigned int devfn, int where,
353 struct zpci_dev *zdev = get_zdev_by_bus(bus);
356 if (!zdev || devfn != ZPCI_DEVFN)
359 ret = zpci_cfg_load(zdev, where, val, size);
364 static int pci_write(struct pci_bus *bus, unsigned int devfn, int where,
367 struct zpci_dev *zdev = get_zdev_by_bus(bus);
370 if (!zdev || devfn != ZPCI_DEVFN)
373 ret = zpci_cfg_store(zdev, where, val, size);
378 static struct pci_ops pci_root_ops = {
383 static void zpci_irq_handler(struct airq_struct *airq)
385 unsigned long si, ai;
386 struct airq_iv *aibv;
389 inc_irq_stat(IRQIO_PCI);
391 /* Scan adapter summary indicator bit vector */
392 si = airq_iv_scan(zpci_aisb_iv, si, airq_iv_end(zpci_aisb_iv));
395 /* End of second scan with interrupts on. */
397 /* First scan complete, reenable interrupts. */
398 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
403 /* Scan the adapter interrupt vector for this device. */
404 aibv = zpci_aibv[si];
406 ai = airq_iv_scan(aibv, ai, airq_iv_end(aibv));
409 inc_irq_stat(IRQIO_MSI);
410 airq_iv_lock(aibv, ai);
411 generic_handle_irq(airq_iv_get_data(aibv, ai));
412 airq_iv_unlock(aibv, ai);
417 int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
419 struct zpci_dev *zdev = get_zdev(pdev);
420 unsigned int hwirq, irq, msi_vecs;
422 struct msi_desc *msi;
426 if (type != PCI_CAP_ID_MSIX && type != PCI_CAP_ID_MSI)
428 msi_vecs = min(nvec, ZPCI_MSI_VEC_MAX);
429 msi_vecs = min_t(unsigned int, msi_vecs, CONFIG_PCI_NR_MSI);
431 /* Allocate adapter summary indicator bit */
433 aisb = airq_iv_alloc_bit(zpci_aisb_iv);
438 /* Create adapter interrupt vector */
440 zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK);
444 /* Wire up shortcut pointer */
445 zpci_aibv[aisb] = zdev->aibv;
447 /* Request MSI interrupts */
449 list_for_each_entry(msi, &pdev->msi_list, list) {
451 irq = irq_alloc_desc(0); /* Alloc irq on node 0 */
454 rc = irq_set_msi_desc(irq, msi);
457 irq_set_chip_and_handler(irq, &zpci_irq_chip,
460 msg.address_lo = zdev->msi_addr & 0xffffffff;
461 msg.address_hi = zdev->msi_addr >> 32;
462 write_msi_msg(irq, &msg);
463 airq_iv_set_data(zdev->aibv, hwirq, irq);
467 /* Enable adapter interrupts */
468 rc = zpci_set_airq(zdev);
472 return (msi_vecs == nvec) ? 0 : msi_vecs;
475 list_for_each_entry(msi, &pdev->msi_list, list) {
478 irq_set_msi_desc(msi->irq, NULL);
479 irq_free_desc(msi->irq);
480 msi->msg.address_lo = 0;
481 msi->msg.address_hi = 0;
485 zpci_aibv[aisb] = NULL;
486 airq_iv_release(zdev->aibv);
488 airq_iv_free_bit(zpci_aisb_iv, aisb);
493 void arch_teardown_msi_irqs(struct pci_dev *pdev)
495 struct zpci_dev *zdev = get_zdev(pdev);
496 struct msi_desc *msi;
499 /* Disable adapter interrupts */
500 rc = zpci_clear_airq(zdev);
504 /* Release MSI interrupts */
505 list_for_each_entry(msi, &pdev->msi_list, list) {
506 zpci_msi_set_mask_bits(msi, 1, 1);
507 irq_set_msi_desc(msi->irq, NULL);
508 irq_free_desc(msi->irq);
509 msi->msg.address_lo = 0;
510 msi->msg.address_hi = 0;
515 zpci_aibv[zdev->aisb] = NULL;
516 airq_iv_release(zdev->aibv);
517 airq_iv_free_bit(zpci_aisb_iv, zdev->aisb);
520 static void zpci_map_resources(struct zpci_dev *zdev)
522 struct pci_dev *pdev = zdev->pdev;
526 for (i = 0; i < PCI_BAR_COUNT; i++) {
527 len = pci_resource_len(pdev, i);
530 pdev->resource[i].start = (resource_size_t) pci_iomap(pdev, i, 0);
531 pdev->resource[i].end = pdev->resource[i].start + len - 1;
535 static void zpci_unmap_resources(struct zpci_dev *zdev)
537 struct pci_dev *pdev = zdev->pdev;
541 for (i = 0; i < PCI_BAR_COUNT; i++) {
542 len = pci_resource_len(pdev, i);
545 pci_iounmap(pdev, (void *) pdev->resource[i].start);
549 struct zpci_dev *zpci_alloc_device(void)
551 struct zpci_dev *zdev;
553 /* Alloc memory for our private pci device data */
554 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
555 return zdev ? : ERR_PTR(-ENOMEM);
558 void zpci_free_device(struct zpci_dev *zdev)
563 int pcibios_add_platform_entries(struct pci_dev *pdev)
565 return zpci_sysfs_add_device(&pdev->dev);
568 static int __init zpci_irq_init(void)
572 rc = register_adapter_interrupt(&zpci_airq);
575 /* Set summary to 1 to be called every time for the ISC. */
576 *zpci_airq.lsi_ptr = 1;
579 zpci_aisb_iv = airq_iv_create(ZPCI_NR_DEVICES, AIRQ_IV_ALLOC);
583 zpci_set_irq_ctrl(SIC_IRQ_MODE_SINGLE, NULL, PCI_ISC);
587 unregister_adapter_interrupt(&zpci_airq);
592 static void zpci_irq_exit(void)
594 airq_iv_release(zpci_aisb_iv);
595 unregister_adapter_interrupt(&zpci_airq);
598 static struct resource *zpci_alloc_bus_resource(unsigned long start, unsigned long size,
599 unsigned long flags, int domain)
605 r = kzalloc(sizeof(*r), GFP_KERNEL);
607 return ERR_PTR(-ENOMEM);
609 r->end = r->start + size - 1;
611 r->parent = &iomem_resource;
612 name = kmalloc(18, GFP_KERNEL);
615 return ERR_PTR(-ENOMEM);
617 sprintf(name, "PCI Bus: %04x:%02x", domain, ZPCI_BUS_NR);
620 rc = request_resource(&iomem_resource, r);
624 return ERR_PTR(-ENOMEM);
629 static int zpci_alloc_iomap(struct zpci_dev *zdev)
633 spin_lock(&zpci_iomap_lock);
634 entry = find_first_zero_bit(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
635 if (entry == ZPCI_IOMAP_MAX_ENTRIES) {
636 spin_unlock(&zpci_iomap_lock);
639 set_bit(entry, zpci_iomap);
640 spin_unlock(&zpci_iomap_lock);
644 static void zpci_free_iomap(struct zpci_dev *zdev, int entry)
646 spin_lock(&zpci_iomap_lock);
647 memset(&zpci_iomap_start[entry], 0, sizeof(struct zpci_iomap_entry));
648 clear_bit(entry, zpci_iomap);
649 spin_unlock(&zpci_iomap_lock);
652 int pcibios_add_device(struct pci_dev *pdev)
654 struct zpci_dev *zdev = get_zdev(pdev);
655 struct resource *res;
659 zpci_map_resources(zdev);
661 for (i = 0; i < PCI_BAR_COUNT; i++) {
662 res = &pdev->resource[i];
663 if (res->parent || !res->flags)
665 pci_claim_resource(pdev, i);
671 int pcibios_enable_device(struct pci_dev *pdev, int mask)
673 struct zpci_dev *zdev = get_zdev(pdev);
674 struct resource *res;
679 zpci_debug_init_device(zdev);
680 zpci_fmb_enable_device(zdev);
681 zpci_map_resources(zdev);
683 pci_read_config_word(pdev, PCI_COMMAND, &cmd);
684 for (i = 0; i < PCI_BAR_COUNT; i++) {
685 res = &pdev->resource[i];
687 if (res->flags & IORESOURCE_IO)
690 if (res->flags & IORESOURCE_MEM)
691 cmd |= PCI_COMMAND_MEMORY;
693 pci_write_config_word(pdev, PCI_COMMAND, cmd);
697 void pcibios_disable_device(struct pci_dev *pdev)
699 struct zpci_dev *zdev = get_zdev(pdev);
701 zpci_unmap_resources(zdev);
702 zpci_fmb_disable_device(zdev);
703 zpci_debug_exit_device(zdev);
707 #ifdef CONFIG_HIBERNATE_CALLBACKS
708 static int zpci_restore(struct device *dev)
710 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
713 if (zdev->state != ZPCI_FN_STATE_ONLINE)
716 ret = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
720 zpci_map_resources(zdev);
721 zpci_register_ioat(zdev, 0, zdev->start_dma + PAGE_OFFSET,
722 zdev->start_dma + zdev->iommu_size - 1,
723 (u64) zdev->dma_table);
729 static int zpci_freeze(struct device *dev)
731 struct zpci_dev *zdev = get_zdev(to_pci_dev(dev));
733 if (zdev->state != ZPCI_FN_STATE_ONLINE)
736 zpci_unregister_ioat(zdev, 0);
737 return clp_disable_fh(zdev);
740 struct dev_pm_ops pcibios_pm_ops = {
741 .thaw_noirq = zpci_restore,
742 .freeze_noirq = zpci_freeze,
743 .restore_noirq = zpci_restore,
744 .poweroff_noirq = zpci_freeze,
746 #endif /* CONFIG_HIBERNATE_CALLBACKS */
748 static int zpci_scan_bus(struct zpci_dev *zdev)
750 struct resource *res;
751 LIST_HEAD(resources);
754 /* allocate mapping entry for each used bar */
755 for (i = 0; i < PCI_BAR_COUNT; i++) {
756 unsigned long addr, size, flags;
759 if (!zdev->bars[i].size)
761 entry = zpci_alloc_iomap(zdev);
764 zdev->bars[i].map_idx = entry;
766 /* only MMIO is supported */
767 flags = IORESOURCE_MEM;
768 if (zdev->bars[i].val & 8)
769 flags |= IORESOURCE_PREFETCH;
770 if (zdev->bars[i].val & 4)
771 flags |= IORESOURCE_MEM_64;
773 addr = ZPCI_IOMAP_ADDR_BASE + ((u64) entry << 48);
775 size = 1UL << zdev->bars[i].size;
777 res = zpci_alloc_bus_resource(addr, size, flags, zdev->domain);
779 zpci_free_iomap(zdev, entry);
782 pci_add_resource(&resources, res);
785 zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
790 zdev->bus->max_bus_speed = zdev->max_bus_speed;
794 static int zpci_alloc_domain(struct zpci_dev *zdev)
796 spin_lock(&zpci_domain_lock);
797 zdev->domain = find_first_zero_bit(zpci_domain, ZPCI_NR_DEVICES);
798 if (zdev->domain == ZPCI_NR_DEVICES) {
799 spin_unlock(&zpci_domain_lock);
802 set_bit(zdev->domain, zpci_domain);
803 spin_unlock(&zpci_domain_lock);
807 static void zpci_free_domain(struct zpci_dev *zdev)
809 spin_lock(&zpci_domain_lock);
810 clear_bit(zdev->domain, zpci_domain);
811 spin_unlock(&zpci_domain_lock);
814 int zpci_enable_device(struct zpci_dev *zdev)
818 rc = clp_enable_fh(zdev, ZPCI_NR_DMA_SPACES);
822 rc = zpci_dma_init_device(zdev);
826 zdev->state = ZPCI_FN_STATE_ONLINE;
830 clp_disable_fh(zdev);
834 EXPORT_SYMBOL_GPL(zpci_enable_device);
836 int zpci_disable_device(struct zpci_dev *zdev)
838 zpci_dma_exit_device(zdev);
839 return clp_disable_fh(zdev);
841 EXPORT_SYMBOL_GPL(zpci_disable_device);
843 int zpci_create_device(struct zpci_dev *zdev)
847 rc = zpci_alloc_domain(zdev);
851 if (zdev->state == ZPCI_FN_STATE_CONFIGURED) {
852 rc = zpci_enable_device(zdev);
856 rc = zpci_scan_bus(zdev);
860 spin_lock(&zpci_list_lock);
861 list_add_tail(&zdev->entry, &zpci_list);
862 spin_unlock(&zpci_list_lock);
864 zpci_init_slot(zdev);
869 if (zdev->state == ZPCI_FN_STATE_ONLINE)
870 zpci_disable_device(zdev);
872 zpci_free_domain(zdev);
877 void zpci_stop_device(struct zpci_dev *zdev)
879 zpci_dma_exit_device(zdev);
881 * Note: SCLP disables fh via set-pci-fn so don't
885 EXPORT_SYMBOL_GPL(zpci_stop_device);
887 static inline int barsize(u8 size)
889 return (size) ? (1 << size) >> 10 : 0;
892 static int zpci_mem_init(void)
894 zdev_fmb_cache = kmem_cache_create("PCI_FMB_cache", sizeof(struct zpci_fmb),
899 /* TODO: use realloc */
900 zpci_iomap_start = kzalloc(ZPCI_IOMAP_MAX_ENTRIES * sizeof(*zpci_iomap_start),
902 if (!zpci_iomap_start)
907 kmem_cache_destroy(zdev_fmb_cache);
912 static void zpci_mem_exit(void)
914 kfree(zpci_iomap_start);
915 kmem_cache_destroy(zdev_fmb_cache);
918 static unsigned int s390_pci_probe;
920 char * __init pcibios_setup(char *str)
922 if (!strcmp(str, "on")) {
929 static int __init pci_base_init(void)
936 if (!test_facility(2) || !test_facility(69)
937 || !test_facility(71) || !test_facility(72))
940 rc = zpci_debug_init();
944 rc = zpci_mem_init();
948 rc = zpci_irq_init();
952 rc = zpci_dma_init();
956 rc = clp_scan_pci_devices();
973 subsys_initcall_sync(pci_base_init);
975 void zpci_rescan(void)
977 clp_rescan_pci_devices_simple();