1 #include <linux/string.h>
2 #include <linux/kernel.h>
4 #include <linux/init.h>
5 #include <linux/module.h>
6 #include <linux/mod_devicetable.h>
7 #include <linux/slab.h>
8 #include <linux/errno.h>
10 #include <linux/of_device.h>
11 #include <linux/of_platform.h>
13 void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
15 unsigned long ret = res->start + offset;
18 if (res->flags & IORESOURCE_MEM)
19 r = request_mem_region(ret, size, name);
21 r = request_region(ret, size, name);
25 return (void __iomem *) ret;
27 EXPORT_SYMBOL(of_ioremap);
29 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
31 if (res->flags & IORESOURCE_MEM)
32 release_mem_region((unsigned long) base, size);
34 release_region((unsigned long) base, size);
36 EXPORT_SYMBOL(of_iounmap);
38 static int node_match(struct device *dev, void *data)
40 struct of_device *op = to_of_device(dev);
41 struct device_node *dp = data;
43 return (op->node == dp);
46 struct of_device *of_find_device_by_node(struct device_node *dp)
48 struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
52 return to_of_device(dev);
56 EXPORT_SYMBOL(of_find_device_by_node);
58 unsigned int irq_of_parse_and_map(struct device_node *node, int index)
60 struct of_device *op = of_find_device_by_node(node);
62 if (!op || index >= op->num_irqs)
65 return op->irqs[index];
67 EXPORT_SYMBOL(irq_of_parse_and_map);
69 /* Take the archdata values for IOMMU, STC, and HOSTDATA found in
70 * BUS and propagate to all child of_device objects.
72 void of_propagate_archdata(struct of_device *bus)
74 struct dev_archdata *bus_sd = &bus->dev.archdata;
75 struct device_node *bus_dp = bus->node;
76 struct device_node *dp;
78 for (dp = bus_dp->child; dp; dp = dp->sibling) {
79 struct of_device *op = of_find_device_by_node(dp);
81 op->dev.archdata.iommu = bus_sd->iommu;
82 op->dev.archdata.stc = bus_sd->stc;
83 op->dev.archdata.host_controller = bus_sd->host_controller;
84 op->dev.archdata.numa_node = bus_sd->numa_node;
87 of_propagate_archdata(op);
91 struct bus_type of_platform_bus_type;
92 EXPORT_SYMBOL(of_platform_bus_type);
94 static inline u64 of_read_addr(const u32 *cell, int size)
98 r = (r << 32) | *(cell++);
102 static void get_cells(struct device_node *dp, int *addrc, int *sizec)
105 *addrc = of_n_addr_cells(dp);
107 *sizec = of_n_size_cells(dp);
110 /* Max address size we deal with */
111 #define OF_MAX_ADDR_CELLS 4
115 const char *addr_prop_name;
116 int (*match)(struct device_node *parent);
117 void (*count_cells)(struct device_node *child,
118 int *addrc, int *sizec);
119 int (*map)(u32 *addr, const u32 *range,
120 int na, int ns, int pna);
121 unsigned long (*get_flags)(const u32 *addr, unsigned long);
125 * Default translator (generic bus)
128 static void of_bus_default_count_cells(struct device_node *dev,
129 int *addrc, int *sizec)
131 get_cells(dev, addrc, sizec);
134 /* Make sure the least significant 64-bits are in-range. Even
135 * for 3 or 4 cell values it is a good enough approximation.
137 static int of_out_of_range(const u32 *addr, const u32 *base,
138 const u32 *size, int na, int ns)
140 u64 a = of_read_addr(addr, na);
141 u64 b = of_read_addr(base, na);
146 b += of_read_addr(size, ns);
153 static int of_bus_default_map(u32 *addr, const u32 *range,
154 int na, int ns, int pna)
156 u32 result[OF_MAX_ADDR_CELLS];
160 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
164 if (of_out_of_range(addr, range, range + na + pna, na, ns))
167 /* Start with the parent range base. */
168 memcpy(result, range + na, pna * 4);
170 /* Add in the child address offset. */
171 for (i = 0; i < na; i++)
172 result[pna - 1 - i] +=
176 memcpy(addr, result, pna * 4);
181 static unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
185 return IORESOURCE_MEM;
189 * PCI bus specific translator
192 static int of_bus_pci_match(struct device_node *np)
194 if (!strcmp(np->name, "pci")) {
195 const char *model = of_get_property(np, "model", NULL);
197 if (model && !strcmp(model, "SUNW,simba"))
200 /* Do not do PCI specific frobbing if the
201 * PCI bridge lacks a ranges property. We
202 * want to pass it through up to the next
203 * parent as-is, not with the PCI translate
204 * method which chops off the top address cell.
206 if (!of_find_property(np, "ranges", NULL))
215 static int of_bus_simba_match(struct device_node *np)
217 const char *model = of_get_property(np, "model", NULL);
219 if (model && !strcmp(model, "SUNW,simba"))
222 /* Treat PCI busses lacking ranges property just like
225 if (!strcmp(np->name, "pci")) {
226 if (!of_find_property(np, "ranges", NULL))
233 static int of_bus_simba_map(u32 *addr, const u32 *range,
234 int na, int ns, int pna)
239 static void of_bus_pci_count_cells(struct device_node *np,
240 int *addrc, int *sizec)
248 static int of_bus_pci_map(u32 *addr, const u32 *range,
249 int na, int ns, int pna)
251 u32 result[OF_MAX_ADDR_CELLS];
254 /* Check address type match */
255 if ((addr[0] ^ range[0]) & 0x03000000)
258 if (of_out_of_range(addr + 1, range + 1, range + na + pna,
262 /* Start with the parent range base. */
263 memcpy(result, range + na, pna * 4);
265 /* Add in the child address offset, skipping high cell. */
266 for (i = 0; i < na - 1; i++)
267 result[pna - 1 - i] +=
271 memcpy(addr, result, pna * 4);
276 static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
280 /* For PCI, we override whatever child busses may have used. */
282 switch((w >> 24) & 0x03) {
284 flags |= IORESOURCE_IO;
287 case 0x02: /* 32 bits */
288 case 0x03: /* 64 bits */
289 flags |= IORESOURCE_MEM;
293 flags |= IORESOURCE_PREFETCH;
298 * SBUS bus specific translator
301 static int of_bus_sbus_match(struct device_node *np)
303 struct device_node *dp = np;
306 if (!strcmp(dp->name, "sbus") ||
307 !strcmp(dp->name, "sbi"))
310 /* Have a look at use_1to1_mapping(). We're trying
311 * to match SBUS if that's the top-level bus and we
312 * don't have some intervening real bus that provides
313 * ranges based translations.
315 if (of_find_property(dp, "ranges", NULL) != NULL)
324 static void of_bus_sbus_count_cells(struct device_node *child,
325 int *addrc, int *sizec)
334 * FHC/Central bus specific translator.
336 * This is just needed to hard-code the address and size cell
337 * counts. 'fhc' and 'central' nodes lack the #address-cells and
338 * #size-cells properties, and if you walk to the root on such
339 * Enterprise boxes all you'll get is a #size-cells of 2 which is
340 * not what we want to use.
342 static int of_bus_fhc_match(struct device_node *np)
344 return !strcmp(np->name, "fhc") ||
345 !strcmp(np->name, "central");
348 #define of_bus_fhc_count_cells of_bus_sbus_count_cells
351 * Array of bus specific translators
354 static struct of_bus of_busses[] = {
358 .addr_prop_name = "assigned-addresses",
359 .match = of_bus_pci_match,
360 .count_cells = of_bus_pci_count_cells,
361 .map = of_bus_pci_map,
362 .get_flags = of_bus_pci_get_flags,
367 .addr_prop_name = "assigned-addresses",
368 .match = of_bus_simba_match,
369 .count_cells = of_bus_pci_count_cells,
370 .map = of_bus_simba_map,
371 .get_flags = of_bus_pci_get_flags,
376 .addr_prop_name = "reg",
377 .match = of_bus_sbus_match,
378 .count_cells = of_bus_sbus_count_cells,
379 .map = of_bus_default_map,
380 .get_flags = of_bus_default_get_flags,
385 .addr_prop_name = "reg",
386 .match = of_bus_fhc_match,
387 .count_cells = of_bus_fhc_count_cells,
388 .map = of_bus_default_map,
389 .get_flags = of_bus_default_get_flags,
394 .addr_prop_name = "reg",
396 .count_cells = of_bus_default_count_cells,
397 .map = of_bus_default_map,
398 .get_flags = of_bus_default_get_flags,
402 static struct of_bus *of_match_bus(struct device_node *np)
406 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
407 if (!of_busses[i].match || of_busses[i].match(np))
408 return &of_busses[i];
413 static int __init build_one_resource(struct device_node *parent,
417 int na, int ns, int pna)
422 ranges = of_get_property(parent, "ranges", &rlen);
423 if (ranges == NULL || rlen == 0) {
424 u32 result[OF_MAX_ADDR_CELLS];
427 memset(result, 0, pna * 4);
428 for (i = 0; i < na; i++)
429 result[pna - 1 - i] =
432 memcpy(addr, result, pna * 4);
436 /* Now walk through the ranges */
438 rone = na + pna + ns;
439 for (; rlen >= rone; rlen -= rone, ranges += rone) {
440 if (!bus->map(addr, ranges, na, ns, pna))
444 /* When we miss an I/O space match on PCI, just pass it up
445 * to the next PCI bridge and/or controller.
447 if (!strcmp(bus->name, "pci") &&
448 (addr[0] & 0x03000000) == 0x01000000)
454 static int __init use_1to1_mapping(struct device_node *pp)
456 /* If we have a ranges property in the parent, use it. */
457 if (of_find_property(pp, "ranges", NULL) != NULL)
460 /* If the parent is the dma node of an ISA bus, pass
461 * the translation up to the root.
463 * Some SBUS devices use intermediate nodes to express
464 * hierarchy within the device itself. These aren't
465 * real bus nodes, and don't have a 'ranges' property.
466 * But, we should still pass the translation work up
467 * to the SBUS itself.
469 if (!strcmp(pp->name, "dma") ||
470 !strcmp(pp->name, "espdma") ||
471 !strcmp(pp->name, "ledma") ||
472 !strcmp(pp->name, "lebuffer"))
475 /* Similarly for all PCI bridges, if we get this far
476 * it lacks a ranges property, and this will include
479 if (!strcmp(pp->name, "pci"))
485 static int of_resource_verbose;
487 static void __init build_device_resources(struct of_device *op,
488 struct device *parent)
490 struct of_device *p_op;
499 p_op = to_of_device(parent);
500 bus = of_match_bus(p_op->node);
501 bus->count_cells(op->node, &na, &ns);
503 preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
504 if (!preg || num_reg == 0)
507 /* Convert to num-cells. */
510 /* Convert to num-entries. */
513 /* Prevent overrunning the op->resources[] array. */
514 if (num_reg > PROMREG_MAX) {
515 printk(KERN_WARNING "%s: Too many regs (%d), "
517 op->node->full_name, num_reg, PROMREG_MAX);
518 num_reg = PROMREG_MAX;
521 for (index = 0; index < num_reg; index++) {
522 struct resource *r = &op->resource[index];
523 u32 addr[OF_MAX_ADDR_CELLS];
524 const u32 *reg = (preg + (index * ((na + ns) * 4)));
525 struct device_node *dp = op->node;
526 struct device_node *pp = p_op->node;
527 struct of_bus *pbus, *dbus;
528 u64 size, result = OF_BAD_ADDR;
533 size = of_read_addr(reg + na, ns);
534 memcpy(addr, reg, na * 4);
536 flags = bus->get_flags(addr, 0);
538 if (use_1to1_mapping(pp)) {
539 result = of_read_addr(addr, na);
551 result = of_read_addr(addr, dna);
555 pbus = of_match_bus(pp);
556 pbus->count_cells(dp, &pna, &pns);
558 if (build_one_resource(dp, dbus, pbus, addr,
562 flags = pbus->get_flags(addr, flags);
570 memset(r, 0, sizeof(*r));
572 if (of_resource_verbose)
573 printk("%s reg[%d] -> %llx\n",
574 op->node->full_name, index,
577 if (result != OF_BAD_ADDR) {
578 if (tlb_type == hypervisor)
579 result &= 0x0fffffffffffffffUL;
582 r->end = result + size - 1;
585 r->name = op->node->name;
589 static struct device_node * __init
590 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
591 const u32 *imap, int imlen, const u32 *imask,
594 struct device_node *cp;
595 unsigned int irq = *irq_p;
601 bus = of_match_bus(pp);
602 bus->count_cells(dp, &na, NULL);
604 reg = of_get_property(dp, "reg", &num_reg);
605 if (!reg || !num_reg)
608 imlen /= ((na + 3) * 4);
610 for (i = 0; i < imlen; i++) {
613 for (j = 0; j < na; j++) {
614 if ((reg[j] & imask[j]) != imap[j])
617 if (imap[na] == irq) {
618 handle = imap[na + 1];
627 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
628 * properties that do not include the on-board device
629 * interrupts. Instead, the device's 'interrupts' property
630 * is already a fully specified INO value.
632 * Handle this by deciding that, if we didn't get a
633 * match in the parent's 'interrupt-map', and the
634 * parent is an IRQ translater, then use the parent as
635 * our IRQ controller.
644 cp = of_find_node_by_phandle(handle);
649 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
650 struct device_node *pp,
653 const struct linux_prom_pci_registers *regs;
654 unsigned int bus, devfn, slot, ret;
656 if (irq < 1 || irq > 4)
659 regs = of_get_property(dp, "reg", NULL);
663 bus = (regs->phys_hi >> 16) & 0xff;
664 devfn = (regs->phys_hi >> 8) & 0xff;
665 slot = (devfn >> 3) & 0x1f;
668 /* Derived from Table 8-3, U2P User's Manual. This branch
669 * is handling a PCI controller that lacks a proper set of
670 * interrupt-map and interrupt-map-mask properties. The
671 * Ultra-E450 is one example.
673 * The bit layout is BSSLL, where:
674 * B: 0 on bus A, 1 on bus B
675 * D: 2-bit slot number, derived from PCI device number as
676 * (dev - 1) for bus A, or (dev - 2) for bus B
677 * L: 2-bit line number
682 slot = (slot - 1) << 2;
686 slot = (slot - 2) << 2;
690 ret = (bus | slot | irq);
692 /* Going through a PCI-PCI bridge that lacks a set of
693 * interrupt-map and interrupt-map-mask properties.
695 ret = ((irq - 1 + (slot & 3)) & 3) + 1;
701 static int of_irq_verbose;
703 static unsigned int __init build_one_device_irq(struct of_device *op,
704 struct device *parent,
707 struct device_node *dp = op->node;
708 struct device_node *pp, *ip;
709 unsigned int orig_irq = irq;
712 if (irq == 0xffffffff)
716 irq = dp->irq_trans->irq_build(dp, irq,
717 dp->irq_trans->data);
720 printk("%s: direct translate %x --> %x\n",
721 dp->full_name, orig_irq, irq);
726 /* Something more complicated. Walk up to the root, applying
727 * interrupt-map or bus specific translations, until we hit
730 * If we hit a bus type or situation we cannot handle, we
731 * stop and assume that the original IRQ number was in a
732 * format which has special meaning to it's immediate parent.
737 const void *imap, *imsk;
740 imap = of_get_property(pp, "interrupt-map", &imlen);
741 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
743 struct device_node *iret;
744 int this_orig_irq = irq;
746 iret = apply_interrupt_map(dp, pp,
751 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
753 pp->full_name, this_orig_irq,
754 (iret ? iret->full_name : "NULL"), irq);
759 if (iret->irq_trans) {
764 if (!strcmp(pp->name, "pci")) {
765 unsigned int this_orig_irq = irq;
767 irq = pci_irq_swizzle(dp, pp, irq);
769 printk("%s: PCI swizzle [%s] "
772 pp->full_name, this_orig_irq,
788 irq = ip->irq_trans->irq_build(op->node, irq,
789 ip->irq_trans->data);
791 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
792 op->node->full_name, ip->full_name, orig_irq, irq);
795 nid = of_node_to_nid(dp);
797 cpumask_t numa_mask = *cpumask_of_node(nid);
799 irq_set_affinity(irq, &numa_mask);
805 static struct of_device * __init scan_one_device(struct device_node *dp,
806 struct device *parent)
808 struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
809 const unsigned int *irq;
810 struct dev_archdata *sd;
816 sd = &op->dev.archdata;
822 op->clock_freq = of_getintprop_default(dp, "clock-frequency",
824 op->portid = of_getintprop_default(dp, "upa-portid", -1);
825 if (op->portid == -1)
826 op->portid = of_getintprop_default(dp, "portid", -1);
828 irq = of_get_property(dp, "interrupts", &len);
830 op->num_irqs = len / 4;
832 /* Prevent overrunning the op->irqs[] array. */
833 if (op->num_irqs > PROMINTR_MAX) {
834 printk(KERN_WARNING "%s: Too many irqs (%d), "
836 dp->full_name, op->num_irqs, PROMINTR_MAX);
837 op->num_irqs = PROMINTR_MAX;
839 memcpy(op->irqs, irq, op->num_irqs * 4);
844 build_device_resources(op, parent);
845 for (i = 0; i < op->num_irqs; i++)
846 op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);
848 op->dev.parent = parent;
849 op->dev.bus = &of_platform_bus_type;
851 dev_set_name(&op->dev, "root");
853 dev_set_name(&op->dev, "%08x", dp->node);
855 if (of_device_register(op)) {
856 printk("%s: Could not register of device.\n",
865 static void __init scan_tree(struct device_node *dp, struct device *parent)
868 struct of_device *op = scan_one_device(dp, parent);
871 scan_tree(dp->child, &op->dev);
877 static void __init scan_of_devices(void)
879 struct device_node *root = of_find_node_by_path("/");
880 struct of_device *parent;
882 parent = scan_one_device(root, NULL);
886 scan_tree(root->child, &parent->dev);
889 static int __init of_bus_driver_init(void)
893 err = of_bus_type_init(&of_platform_bus_type, "of");
900 postcore_initcall(of_bus_driver_init);
902 static int __init of_debug(char *str)
906 get_option(&str, &val);
908 of_resource_verbose = 1;
914 __setup("of_debug=", of_debug);