1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/string.h>
3 #include <linux/kernel.h>
5 #include <linux/dma-mapping.h>
6 #include <linux/init.h>
7 #include <linux/export.h>
8 #include <linux/mod_devicetable.h>
9 #include <linux/slab.h>
10 #include <linux/errno.h>
11 #include <linux/irq.h>
12 #include <linux/of_device.h>
13 #include <linux/of_platform.h>
14 #include <asm/spitfire.h>
16 #include "of_device_common.h"
18 void __iomem *of_ioremap(struct resource *res, unsigned long offset, unsigned long size, char *name)
20 unsigned long ret = res->start + offset;
23 if (res->flags & IORESOURCE_MEM)
24 r = request_mem_region(ret, size, name);
26 r = request_region(ret, size, name);
30 return (void __iomem *) ret;
32 EXPORT_SYMBOL(of_ioremap);
34 void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
36 if (res->flags & IORESOURCE_MEM)
37 release_mem_region((unsigned long) base, size);
39 release_region((unsigned long) base, size);
41 EXPORT_SYMBOL(of_iounmap);
44 * PCI bus specific translator
47 static int of_bus_pci_match(struct device_node *np)
49 if (!strcmp(np->name, "pci")) {
50 const char *model = of_get_property(np, "model", NULL);
52 if (model && !strcmp(model, "SUNW,simba"))
55 /* Do not do PCI specific frobbing if the
56 * PCI bridge lacks a ranges property. We
57 * want to pass it through up to the next
58 * parent as-is, not with the PCI translate
59 * method which chops off the top address cell.
61 if (!of_find_property(np, "ranges", NULL))
70 static int of_bus_simba_match(struct device_node *np)
72 const char *model = of_get_property(np, "model", NULL);
74 if (model && !strcmp(model, "SUNW,simba"))
77 /* Treat PCI busses lacking ranges property just like
80 if (!strcmp(np->name, "pci")) {
81 if (!of_find_property(np, "ranges", NULL))
88 static int of_bus_simba_map(u32 *addr, const u32 *range,
89 int na, int ns, int pna)
94 static void of_bus_pci_count_cells(struct device_node *np,
95 int *addrc, int *sizec)
103 static int of_bus_pci_map(u32 *addr, const u32 *range,
104 int na, int ns, int pna)
106 u32 result[OF_MAX_ADDR_CELLS];
109 /* Check address type match */
110 if (!((addr[0] ^ range[0]) & 0x03000000))
113 /* Special exception, we can map a 64-bit address into
116 if ((addr[0] & 0x03000000) == 0x03000000 &&
117 (range[0] & 0x03000000) == 0x02000000)
123 if (of_out_of_range(addr + 1, range + 1, range + na + pna,
127 /* Start with the parent range base. */
128 memcpy(result, range + na, pna * 4);
130 /* Add in the child address offset, skipping high cell. */
131 for (i = 0; i < na - 1; i++)
132 result[pna - 1 - i] +=
136 memcpy(addr, result, pna * 4);
141 static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
145 /* For PCI, we override whatever child busses may have used. */
147 switch((w >> 24) & 0x03) {
149 flags |= IORESOURCE_IO;
152 case 0x02: /* 32 bits */
153 case 0x03: /* 64 bits */
154 flags |= IORESOURCE_MEM;
158 flags |= IORESOURCE_PREFETCH;
163 * FHC/Central bus specific translator.
165 * This is just needed to hard-code the address and size cell
166 * counts. 'fhc' and 'central' nodes lack the #address-cells and
167 * #size-cells properties, and if you walk to the root on such
168 * Enterprise boxes all you'll get is a #size-cells of 2 which is
169 * not what we want to use.
171 static int of_bus_fhc_match(struct device_node *np)
173 return !strcmp(np->name, "fhc") ||
174 !strcmp(np->name, "central");
177 #define of_bus_fhc_count_cells of_bus_sbus_count_cells
180 * Array of bus specific translators
183 static struct of_bus of_busses[] = {
187 .addr_prop_name = "assigned-addresses",
188 .match = of_bus_pci_match,
189 .count_cells = of_bus_pci_count_cells,
190 .map = of_bus_pci_map,
191 .get_flags = of_bus_pci_get_flags,
196 .addr_prop_name = "assigned-addresses",
197 .match = of_bus_simba_match,
198 .count_cells = of_bus_pci_count_cells,
199 .map = of_bus_simba_map,
200 .get_flags = of_bus_pci_get_flags,
205 .addr_prop_name = "reg",
206 .match = of_bus_sbus_match,
207 .count_cells = of_bus_sbus_count_cells,
208 .map = of_bus_default_map,
209 .get_flags = of_bus_default_get_flags,
214 .addr_prop_name = "reg",
215 .match = of_bus_fhc_match,
216 .count_cells = of_bus_fhc_count_cells,
217 .map = of_bus_default_map,
218 .get_flags = of_bus_default_get_flags,
223 .addr_prop_name = "reg",
225 .count_cells = of_bus_default_count_cells,
226 .map = of_bus_default_map,
227 .get_flags = of_bus_default_get_flags,
231 static struct of_bus *of_match_bus(struct device_node *np)
235 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
236 if (!of_busses[i].match || of_busses[i].match(np))
237 return &of_busses[i];
242 static int __init build_one_resource(struct device_node *parent,
246 int na, int ns, int pna)
251 ranges = of_get_property(parent, "ranges", &rlen);
252 if (ranges == NULL || rlen == 0) {
253 u32 result[OF_MAX_ADDR_CELLS];
256 memset(result, 0, pna * 4);
257 for (i = 0; i < na; i++)
258 result[pna - 1 - i] =
261 memcpy(addr, result, pna * 4);
265 /* Now walk through the ranges */
267 rone = na + pna + ns;
268 for (; rlen >= rone; rlen -= rone, ranges += rone) {
269 if (!bus->map(addr, ranges, na, ns, pna))
273 /* When we miss an I/O space match on PCI, just pass it up
274 * to the next PCI bridge and/or controller.
276 if (!strcmp(bus->name, "pci") &&
277 (addr[0] & 0x03000000) == 0x01000000)
283 static int __init use_1to1_mapping(struct device_node *pp)
285 /* If we have a ranges property in the parent, use it. */
286 if (of_find_property(pp, "ranges", NULL) != NULL)
289 /* If the parent is the dma node of an ISA bus, pass
290 * the translation up to the root.
292 * Some SBUS devices use intermediate nodes to express
293 * hierarchy within the device itself. These aren't
294 * real bus nodes, and don't have a 'ranges' property.
295 * But, we should still pass the translation work up
296 * to the SBUS itself.
298 if (!strcmp(pp->name, "dma") ||
299 !strcmp(pp->name, "espdma") ||
300 !strcmp(pp->name, "ledma") ||
301 !strcmp(pp->name, "lebuffer"))
304 /* Similarly for all PCI bridges, if we get this far
305 * it lacks a ranges property, and this will include
308 if (!strcmp(pp->name, "pci"))
314 static int of_resource_verbose;
316 static void __init build_device_resources(struct platform_device *op,
317 struct device *parent)
319 struct platform_device *p_op;
328 p_op = to_platform_device(parent);
329 bus = of_match_bus(p_op->dev.of_node);
330 bus->count_cells(op->dev.of_node, &na, &ns);
332 preg = of_get_property(op->dev.of_node, bus->addr_prop_name, &num_reg);
333 if (!preg || num_reg == 0)
336 /* Convert to num-cells. */
339 /* Convert to num-entries. */
342 /* Prevent overrunning the op->resources[] array. */
343 if (num_reg > PROMREG_MAX) {
344 printk(KERN_WARNING "%s: Too many regs (%d), "
346 op->dev.of_node->full_name, num_reg, PROMREG_MAX);
347 num_reg = PROMREG_MAX;
350 op->resource = op->archdata.resource;
351 op->num_resources = num_reg;
352 for (index = 0; index < num_reg; index++) {
353 struct resource *r = &op->resource[index];
354 u32 addr[OF_MAX_ADDR_CELLS];
355 const u32 *reg = (preg + (index * ((na + ns) * 4)));
356 struct device_node *dp = op->dev.of_node;
357 struct device_node *pp = p_op->dev.of_node;
358 struct of_bus *pbus, *dbus;
359 u64 size, result = OF_BAD_ADDR;
364 size = of_read_addr(reg + na, ns);
365 memcpy(addr, reg, na * 4);
367 flags = bus->get_flags(addr, 0);
369 if (use_1to1_mapping(pp)) {
370 result = of_read_addr(addr, na);
382 result = of_read_addr(addr, dna);
386 pbus = of_match_bus(pp);
387 pbus->count_cells(dp, &pna, &pns);
389 if (build_one_resource(dp, dbus, pbus, addr,
393 flags = pbus->get_flags(addr, flags);
401 memset(r, 0, sizeof(*r));
403 if (of_resource_verbose)
404 printk("%s reg[%d] -> %llx\n",
405 op->dev.of_node->full_name, index,
408 if (result != OF_BAD_ADDR) {
409 if (tlb_type == hypervisor)
410 result &= 0x0fffffffffffffffUL;
413 r->end = result + size - 1;
416 r->name = op->dev.of_node->name;
420 static struct device_node * __init
421 apply_interrupt_map(struct device_node *dp, struct device_node *pp,
422 const u32 *imap, int imlen, const u32 *imask,
425 struct device_node *cp;
426 unsigned int irq = *irq_p;
432 bus = of_match_bus(pp);
433 bus->count_cells(dp, &na, NULL);
435 reg = of_get_property(dp, "reg", &num_reg);
436 if (!reg || !num_reg)
439 imlen /= ((na + 3) * 4);
441 for (i = 0; i < imlen; i++) {
444 for (j = 0; j < na; j++) {
445 if ((reg[j] & imask[j]) != imap[j])
448 if (imap[na] == irq) {
449 handle = imap[na + 1];
458 /* Psycho and Sabre PCI controllers can have 'interrupt-map'
459 * properties that do not include the on-board device
460 * interrupts. Instead, the device's 'interrupts' property
461 * is already a fully specified INO value.
463 * Handle this by deciding that, if we didn't get a
464 * match in the parent's 'interrupt-map', and the
465 * parent is an IRQ translator, then use the parent as
466 * our IRQ controller.
475 cp = of_find_node_by_phandle(handle);
480 static unsigned int __init pci_irq_swizzle(struct device_node *dp,
481 struct device_node *pp,
484 const struct linux_prom_pci_registers *regs;
485 unsigned int bus, devfn, slot, ret;
487 if (irq < 1 || irq > 4)
490 regs = of_get_property(dp, "reg", NULL);
494 bus = (regs->phys_hi >> 16) & 0xff;
495 devfn = (regs->phys_hi >> 8) & 0xff;
496 slot = (devfn >> 3) & 0x1f;
499 /* Derived from Table 8-3, U2P User's Manual. This branch
500 * is handling a PCI controller that lacks a proper set of
501 * interrupt-map and interrupt-map-mask properties. The
502 * Ultra-E450 is one example.
504 * The bit layout is BSSLL, where:
505 * B: 0 on bus A, 1 on bus B
506 * D: 2-bit slot number, derived from PCI device number as
507 * (dev - 1) for bus A, or (dev - 2) for bus B
508 * L: 2-bit line number
513 slot = (slot - 1) << 2;
517 slot = (slot - 2) << 2;
521 ret = (bus | slot | irq);
523 /* Going through a PCI-PCI bridge that lacks a set of
524 * interrupt-map and interrupt-map-mask properties.
526 ret = ((irq - 1 + (slot & 3)) & 3) + 1;
532 static int of_irq_verbose;
534 static unsigned int __init build_one_device_irq(struct platform_device *op,
535 struct device *parent,
538 struct device_node *dp = op->dev.of_node;
539 struct device_node *pp, *ip;
540 unsigned int orig_irq = irq;
543 if (irq == 0xffffffff)
547 irq = dp->irq_trans->irq_build(dp, irq,
548 dp->irq_trans->data);
551 printk("%s: direct translate %x --> %x\n",
552 dp->full_name, orig_irq, irq);
557 /* Something more complicated. Walk up to the root, applying
558 * interrupt-map or bus specific translations, until we hit
561 * If we hit a bus type or situation we cannot handle, we
562 * stop and assume that the original IRQ number was in a
563 * format which has special meaning to it's immediate parent.
568 const void *imap, *imsk;
571 imap = of_get_property(pp, "interrupt-map", &imlen);
572 imsk = of_get_property(pp, "interrupt-map-mask", NULL);
574 struct device_node *iret;
575 int this_orig_irq = irq;
577 iret = apply_interrupt_map(dp, pp,
582 printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
583 op->dev.of_node->full_name,
584 pp->full_name, this_orig_irq,
585 of_node_full_name(iret), irq);
590 if (iret->irq_trans) {
595 if (!strcmp(pp->name, "pci")) {
596 unsigned int this_orig_irq = irq;
598 irq = pci_irq_swizzle(dp, pp, irq);
600 printk("%s: PCI swizzle [%s] "
602 op->dev.of_node->full_name,
603 pp->full_name, this_orig_irq,
619 irq = ip->irq_trans->irq_build(op->dev.of_node, irq,
620 ip->irq_trans->data);
622 printk("%s: Apply IRQ trans [%s] %x --> %x\n",
623 op->dev.of_node->full_name, ip->full_name, orig_irq, irq);
626 nid = of_node_to_nid(dp);
630 cpumask_copy(&numa_mask, cpumask_of_node(nid));
631 irq_set_affinity(irq, &numa_mask);
637 static struct platform_device * __init scan_one_device(struct device_node *dp,
638 struct device *parent)
640 struct platform_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
641 const unsigned int *irq;
642 struct dev_archdata *sd;
648 sd = &op->dev.archdata;
651 op->dev.of_node = dp;
653 irq = of_get_property(dp, "interrupts", &len);
655 op->archdata.num_irqs = len / 4;
657 /* Prevent overrunning the op->irqs[] array. */
658 if (op->archdata.num_irqs > PROMINTR_MAX) {
659 printk(KERN_WARNING "%s: Too many irqs (%d), "
661 dp->full_name, op->archdata.num_irqs, PROMINTR_MAX);
662 op->archdata.num_irqs = PROMINTR_MAX;
664 memcpy(op->archdata.irqs, irq, op->archdata.num_irqs * 4);
666 op->archdata.num_irqs = 0;
669 build_device_resources(op, parent);
670 for (i = 0; i < op->archdata.num_irqs; i++)
671 op->archdata.irqs[i] = build_one_device_irq(op, parent, op->archdata.irqs[i]);
673 op->dev.parent = parent;
674 op->dev.bus = &platform_bus_type;
676 dev_set_name(&op->dev, "root");
678 dev_set_name(&op->dev, "%08x", dp->phandle);
679 op->dev.coherent_dma_mask = DMA_BIT_MASK(32);
680 op->dev.dma_mask = &op->dev.coherent_dma_mask;
682 if (of_device_register(op)) {
683 printk("%s: Could not register of device.\n",
692 static void __init scan_tree(struct device_node *dp, struct device *parent)
695 struct platform_device *op = scan_one_device(dp, parent);
698 scan_tree(dp->child, &op->dev);
704 static int __init scan_of_devices(void)
706 struct device_node *root = of_find_node_by_path("/");
707 struct platform_device *parent;
709 parent = scan_one_device(root, NULL);
713 scan_tree(root->child, &parent->dev);
716 postcore_initcall(scan_of_devices);
718 static int __init of_debug(char *str)
722 get_option(&str, &val);
724 of_resource_verbose = 1;
730 __setup("of_debug=", of_debug);