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 #include "of_device_common.h"
15 void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
17 unsigned long ret = res->start + offset;
20 if (res->flags & IORESOURCE_MEM)
21 r = request_mem_region(ret, size, name);
23 r = request_region(ret, size, name);
27 return (void __iomem *) ret;
29 EXPORT_SYMBOL(of_ioremap);
31 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
33 if (res->flags & IORESOURCE_MEM)
34 release_mem_region((unsigned long) base, size);
36 release_region((unsigned long) base, size);
38 EXPORT_SYMBOL(of_iounmap);
41 * PCI bus specific translator
44 static int of_bus_pci_match(struct device_node *np)
46 if (!strcmp(np->name, "pci")) {
47 const char *model = of_get_property(np, "model", NULL);
49 if (model && !strcmp(model, "SUNW,simba"))
52 /* Do not do PCI specific frobbing if the
53 * PCI bridge lacks a ranges property. We
54 * want to pass it through up to the next
55 * parent as-is, not with the PCI translate
56 * method which chops off the top address cell.
58 if (!of_find_property(np, "ranges", NULL))
67 static int of_bus_simba_match(struct device_node *np)
69 const char *model = of_get_property(np, "model", NULL);
71 if (model && !strcmp(model, "SUNW,simba"))
74 /* Treat PCI busses lacking ranges property just like
77 if (!strcmp(np->name, "pci")) {
78 if (!of_find_property(np, "ranges", NULL))
85 static int of_bus_simba_map(u32 *addr, const u32 *range,
86 int na, int ns, int pna)
91 static void of_bus_pci_count_cells(struct device_node *np,
92 int *addrc, int *sizec)
100 static int of_bus_pci_map(u32 *addr, const u32 *range,
101 int na, int ns, int pna)
103 u32 result[OF_MAX_ADDR_CELLS];
106 /* Check address type match */
107 if (!((addr[0] ^ range[0]) & 0x03000000))
110 /* Special exception, we can map a 64-bit address into
113 if ((addr[0] & 0x03000000) == 0x03000000 &&
114 (range[0] & 0x03000000) == 0x02000000)
120 if (of_out_of_range(addr + 1, range + 1, range + na + pna,
124 /* Start with the parent range base. */
125 memcpy(result, range + na, pna * 4);
127 /* Add in the child address offset, skipping high cell. */
128 for (i = 0; i < na - 1; i++)
129 result[pna - 1 - i] +=
133 memcpy(addr, result, pna * 4);
138 static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
142 /* For PCI, we override whatever child busses may have used. */
144 switch((w >> 24) & 0x03) {
146 flags |= IORESOURCE_IO;
149 case 0x02: /* 32 bits */
150 case 0x03: /* 64 bits */
151 flags |= IORESOURCE_MEM;
155 flags |= IORESOURCE_PREFETCH;
160 * FHC/Central bus specific translator.
162 * This is just needed to hard-code the address and size cell
163 * counts. 'fhc' and 'central' nodes lack the #address-cells and
164 * #size-cells properties, and if you walk to the root on such
165 * Enterprise boxes all you'll get is a #size-cells of 2 which is
166 * not what we want to use.
168 static int of_bus_fhc_match(struct device_node *np)
170 return !strcmp(np->name, "fhc") ||
171 !strcmp(np->name, "central");
174 #define of_bus_fhc_count_cells of_bus_sbus_count_cells
177 * Array of bus specific translators
180 static struct of_bus of_busses[] = {
184 .addr_prop_name = "assigned-addresses",
185 .match = of_bus_pci_match,
186 .count_cells = of_bus_pci_count_cells,
187 .map = of_bus_pci_map,
188 .get_flags = of_bus_pci_get_flags,
193 .addr_prop_name = "assigned-addresses",
194 .match = of_bus_simba_match,
195 .count_cells = of_bus_pci_count_cells,
196 .map = of_bus_simba_map,
197 .get_flags = of_bus_pci_get_flags,
202 .addr_prop_name = "reg",
203 .match = of_bus_sbus_match,
204 .count_cells = of_bus_sbus_count_cells,
205 .map = of_bus_default_map,
206 .get_flags = of_bus_default_get_flags,
211 .addr_prop_name = "reg",
212 .match = of_bus_fhc_match,
213 .count_cells = of_bus_fhc_count_cells,
214 .map = of_bus_default_map,
215 .get_flags = of_bus_default_get_flags,
220 .addr_prop_name = "reg",
222 .count_cells = of_bus_default_count_cells,
223 .map = of_bus_default_map,
224 .get_flags = of_bus_default_get_flags,
228 static struct of_bus *of_match_bus(struct device_node *np)
232 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
233 if (!of_busses[i].match || of_busses[i].match(np))
234 return &of_busses[i];
239 static int __init build_one_resource(struct device_node *parent,
243 int na, int ns, int pna)
248 ranges = of_get_property(parent, "ranges", &rlen);
249 if (ranges == NULL || rlen == 0) {
250 u32 result[OF_MAX_ADDR_CELLS];
253 memset(result, 0, pna * 4);
254 for (i = 0; i < na; i++)
255 result[pna - 1 - i] =
258 memcpy(addr, result, pna * 4);
262 /* Now walk through the ranges */
264 rone = na + pna + ns;
265 for (; rlen >= rone; rlen -= rone, ranges += rone) {
266 if (!bus->map(addr, ranges, na, ns, pna))
270 /* When we miss an I/O space match on PCI, just pass it up
271 * to the next PCI bridge and/or controller.
273 if (!strcmp(bus->name, "pci") &&
274 (addr[0] & 0x03000000) == 0x01000000)
280 static int __init use_1to1_mapping(struct device_node *pp)
282 /* If we have a ranges property in the parent, use it. */
283 if (of_find_property(pp, "ranges", NULL) != NULL)
286 /* If the parent is the dma node of an ISA bus, pass
287 * the translation up to the root.
289 * Some SBUS devices use intermediate nodes to express
290 * hierarchy within the device itself. These aren't
291 * real bus nodes, and don't have a 'ranges' property.
292 * But, we should still pass the translation work up
293 * to the SBUS itself.
295 if (!strcmp(pp->name, "dma") ||
296 !strcmp(pp->name, "espdma") ||
297 !strcmp(pp->name, "ledma") ||
298 !strcmp(pp->name, "lebuffer"))
301 /* Similarly for all PCI bridges, if we get this far
302 * it lacks a ranges property, and this will include
305 if (!strcmp(pp->name, "pci"))
311 static int of_resource_verbose;
313 static void __init build_device_resources(struct platform_device *op,
314 struct device *parent)
316 struct platform_device *p_op;
325 p_op = to_platform_device(parent);
326 bus = of_match_bus(p_op->dev.of_node);
327 bus->count_cells(op->dev.of_node, &na, &ns);
329 preg = of_get_property(op->dev.of_node, bus->addr_prop_name, &num_reg);
330 if (!preg || num_reg == 0)
333 /* Convert to num-cells. */
336 /* Convert to num-entries. */
339 /* Prevent overrunning the op->resources[] array. */
340 if (num_reg > PROMREG_MAX) {
341 printk(KERN_WARNING "%s: Too many regs (%d), "
343 op->dev.of_node->full_name, num_reg, PROMREG_MAX);
344 num_reg = PROMREG_MAX;
347 op->resource = op->archdata.resource;
348 op->num_resources = num_reg;
349 for (index = 0; index < num_reg; index++) {
350 struct resource *r = &op->resource[index];
351 u32 addr[OF_MAX_ADDR_CELLS];
352 const u32 *reg = (preg + (index * ((na + ns) * 4)));
353 struct device_node *dp = op->dev.of_node;
354 struct device_node *pp = p_op->dev.of_node;
355 struct of_bus *pbus, *dbus;
356 u64 size, result = OF_BAD_ADDR;
361 size = of_read_addr(reg + na, ns);
362 memcpy(addr, reg, na * 4);
364 flags = bus->get_flags(addr, 0);
366 if (use_1to1_mapping(pp)) {
367 result = of_read_addr(addr, na);
379 result = of_read_addr(addr, dna);
383 pbus = of_match_bus(pp);
384 pbus->count_cells(dp, &pna, &pns);
386 if (build_one_resource(dp, dbus, pbus, addr,
390 flags = pbus->get_flags(addr, flags);
398 memset(r, 0, sizeof(*r));
400 if (of_resource_verbose)
401 printk("%s reg[%d] -> %llx\n",
402 op->dev.of_node->full_name, index,
405 if (result != OF_BAD_ADDR) {
406 if (tlb_type == hypervisor)
407 result &= 0x0fffffffffffffffUL;
410 r->end = result + size - 1;
413 r->name = op->dev.of_node->name;
417 static struct device_node * __init
418 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
419 const u32 *imap, int imlen, const u32 *imask,
422 struct device_node *cp;
423 unsigned int irq = *irq_p;
429 bus = of_match_bus(pp);
430 bus->count_cells(dp, &na, NULL);
432 reg = of_get_property(dp, "reg", &num_reg);
433 if (!reg || !num_reg)
436 imlen /= ((na + 3) * 4);
438 for (i = 0; i < imlen; i++) {
441 for (j = 0; j < na; j++) {
442 if ((reg[j] & imask[j]) != imap[j])
445 if (imap[na] == irq) {
446 handle = imap[na + 1];
455 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
456 * properties that do not include the on-board device
457 * interrupts. Instead, the device's 'interrupts' property
458 * is already a fully specified INO value.
460 * Handle this by deciding that, if we didn't get a
461 * match in the parent's 'interrupt-map', and the
462 * parent is an IRQ translater, then use the parent as
463 * our IRQ controller.
472 cp = of_find_node_by_phandle(handle);
477 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
478 struct device_node *pp,
481 const struct linux_prom_pci_registers *regs;
482 unsigned int bus, devfn, slot, ret;
484 if (irq < 1 || irq > 4)
487 regs = of_get_property(dp, "reg", NULL);
491 bus = (regs->phys_hi >> 16) & 0xff;
492 devfn = (regs->phys_hi >> 8) & 0xff;
493 slot = (devfn >> 3) & 0x1f;
496 /* Derived from Table 8-3, U2P User's Manual. This branch
497 * is handling a PCI controller that lacks a proper set of
498 * interrupt-map and interrupt-map-mask properties. The
499 * Ultra-E450 is one example.
501 * The bit layout is BSSLL, where:
502 * B: 0 on bus A, 1 on bus B
503 * D: 2-bit slot number, derived from PCI device number as
504 * (dev - 1) for bus A, or (dev - 2) for bus B
505 * L: 2-bit line number
510 slot = (slot - 1) << 2;
514 slot = (slot - 2) << 2;
518 ret = (bus | slot | irq);
520 /* Going through a PCI-PCI bridge that lacks a set of
521 * interrupt-map and interrupt-map-mask properties.
523 ret = ((irq - 1 + (slot & 3)) & 3) + 1;
529 static int of_irq_verbose;
531 static unsigned int __init build_one_device_irq(struct platform_device *op,
532 struct device *parent,
535 struct device_node *dp = op->dev.of_node;
536 struct device_node *pp, *ip;
537 unsigned int orig_irq = irq;
540 if (irq == 0xffffffff)
544 irq = dp->irq_trans->irq_build(dp, irq,
545 dp->irq_trans->data);
548 printk("%s: direct translate %x --> %x\n",
549 dp->full_name, orig_irq, irq);
554 /* Something more complicated. Walk up to the root, applying
555 * interrupt-map or bus specific translations, until we hit
558 * If we hit a bus type or situation we cannot handle, we
559 * stop and assume that the original IRQ number was in a
560 * format which has special meaning to it's immediate parent.
565 const void *imap, *imsk;
568 imap = of_get_property(pp, "interrupt-map", &imlen);
569 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
571 struct device_node *iret;
572 int this_orig_irq = irq;
574 iret = apply_interrupt_map(dp, pp,
579 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
580 op->dev.of_node->full_name,
581 pp->full_name, this_orig_irq,
582 (iret ? iret->full_name : "NULL"), irq);
587 if (iret->irq_trans) {
592 if (!strcmp(pp->name, "pci")) {
593 unsigned int this_orig_irq = irq;
595 irq = pci_irq_swizzle(dp, pp, irq);
597 printk("%s: PCI swizzle [%s] "
599 op->dev.of_node->full_name,
600 pp->full_name, this_orig_irq,
616 irq = ip->irq_trans->irq_build(op->dev.of_node, irq,
617 ip->irq_trans->data);
619 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
620 op->dev.of_node->full_name, ip->full_name, orig_irq, irq);
623 nid = of_node_to_nid(dp);
625 cpumask_t numa_mask = *cpumask_of_node(nid);
627 irq_set_affinity(irq, &numa_mask);
633 static struct platform_device * __init scan_one_device(struct device_node *dp,
634 struct device *parent)
636 struct platform_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
637 const unsigned int *irq;
638 struct dev_archdata *sd;
644 sd = &op->dev.archdata;
647 op->dev.of_node = dp;
649 irq = of_get_property(dp, "interrupts", &len);
651 op->archdata.num_irqs = len / 4;
653 /* Prevent overrunning the op->irqs[] array. */
654 if (op->archdata.num_irqs > PROMINTR_MAX) {
655 printk(KERN_WARNING "%s: Too many irqs (%d), "
657 dp->full_name, op->archdata.num_irqs, PROMINTR_MAX);
658 op->archdata.num_irqs = PROMINTR_MAX;
660 memcpy(op->archdata.irqs, irq, op->archdata.num_irqs * 4);
662 op->archdata.num_irqs = 0;
665 build_device_resources(op, parent);
666 for (i = 0; i < op->archdata.num_irqs; i++)
667 op->archdata.irqs[i] = build_one_device_irq(op, parent, op->archdata.irqs[i]);
669 op->dev.parent = parent;
670 op->dev.bus = &platform_bus_type;
672 dev_set_name(&op->dev, "root");
674 dev_set_name(&op->dev, "%08x", dp->phandle);
676 if (of_device_register(op)) {
677 printk("%s: Could not register of device.\n",
686 static void __init scan_tree(struct device_node *dp, struct device *parent)
689 struct platform_device *op = scan_one_device(dp, parent);
692 scan_tree(dp->child, &op->dev);
698 static int __init scan_of_devices(void)
700 struct device_node *root = of_find_node_by_path("/");
701 struct platform_device *parent;
703 parent = scan_one_device(root, NULL);
707 scan_tree(root->child, &parent->dev);
710 postcore_initcall(scan_of_devices);
712 static int __init of_debug(char *str)
716 get_option(&str, &val);
718 of_resource_verbose = 1;
724 __setup("of_debug=", of_debug);