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>
9 #include <linux/of_device.h>
10 #include <linux/of_platform.h>
12 static int node_match(struct device *dev, void *data)
14 struct of_device *op = to_of_device(dev);
15 struct device_node *dp = data;
17 return (op->node == dp);
20 struct of_device *of_find_device_by_node(struct device_node *dp)
22 struct device *dev = bus_find_device(&of_platform_bus_type, NULL,
26 return to_of_device(dev);
30 EXPORT_SYMBOL(of_find_device_by_node);
32 unsigned int irq_of_parse_and_map(struct device_node *node, int index)
34 struct of_device *op = of_find_device_by_node(node);
36 if (!op || index >= op->num_irqs)
39 return op->irqs[index];
41 EXPORT_SYMBOL(irq_of_parse_and_map);
43 /* Take the archdata values for IOMMU, STC, and HOSTDATA found in
44 * BUS and propagate to all child of_device objects.
46 void of_propagate_archdata(struct of_device *bus)
48 struct dev_archdata *bus_sd = &bus->dev.archdata;
49 struct device_node *bus_dp = bus->node;
50 struct device_node *dp;
52 for (dp = bus_dp->child; dp; dp = dp->sibling) {
53 struct of_device *op = of_find_device_by_node(dp);
55 op->dev.archdata.iommu = bus_sd->iommu;
56 op->dev.archdata.stc = bus_sd->stc;
57 op->dev.archdata.host_controller = bus_sd->host_controller;
58 op->dev.archdata.numa_node = bus_sd->numa_node;
61 of_propagate_archdata(op);
65 struct bus_type of_platform_bus_type;
66 EXPORT_SYMBOL(of_platform_bus_type);
68 static inline u64 of_read_addr(const u32 *cell, int size)
72 r = (r << 32) | *(cell++);
76 static void __init get_cells(struct device_node *dp,
77 int *addrc, int *sizec)
80 *addrc = of_n_addr_cells(dp);
82 *sizec = of_n_size_cells(dp);
85 /* Max address size we deal with */
86 #define OF_MAX_ADDR_CELLS 4
90 const char *addr_prop_name;
91 int (*match)(struct device_node *parent);
92 void (*count_cells)(struct device_node *child,
93 int *addrc, int *sizec);
94 int (*map)(u32 *addr, const u32 *range,
95 int na, int ns, int pna);
96 unsigned long (*get_flags)(const u32 *addr, unsigned long);
100 * Default translator (generic bus)
103 static void of_bus_default_count_cells(struct device_node *dev,
104 int *addrc, int *sizec)
106 get_cells(dev, addrc, sizec);
109 /* Make sure the least significant 64-bits are in-range. Even
110 * for 3 or 4 cell values it is a good enough approximation.
112 static int of_out_of_range(const u32 *addr, const u32 *base,
113 const u32 *size, int na, int ns)
115 u64 a = of_read_addr(addr, na);
116 u64 b = of_read_addr(base, na);
121 b += of_read_addr(size, ns);
128 static int of_bus_default_map(u32 *addr, const u32 *range,
129 int na, int ns, int pna)
131 u32 result[OF_MAX_ADDR_CELLS];
135 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
139 if (of_out_of_range(addr, range, range + na + pna, na, ns))
142 /* Start with the parent range base. */
143 memcpy(result, range + na, pna * 4);
145 /* Add in the child address offset. */
146 for (i = 0; i < na; i++)
147 result[pna - 1 - i] +=
151 memcpy(addr, result, pna * 4);
156 static unsigned long of_bus_default_get_flags(const u32 *addr, unsigned long flags)
160 return IORESOURCE_MEM;
164 * PCI bus specific translator
167 static int of_bus_pci_match(struct device_node *np)
169 if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
170 /* Do not do PCI specific frobbing if the
171 * PCI bridge lacks a ranges property. We
172 * want to pass it through up to the next
173 * parent as-is, not with the PCI translate
174 * method which chops off the top address cell.
176 if (!of_find_property(np, "ranges", NULL))
185 static void of_bus_pci_count_cells(struct device_node *np,
186 int *addrc, int *sizec)
194 static int of_bus_pci_map(u32 *addr, const u32 *range,
195 int na, int ns, int pna)
197 u32 result[OF_MAX_ADDR_CELLS];
200 /* Check address type match */
201 if ((addr[0] ^ range[0]) & 0x03000000)
204 if (of_out_of_range(addr + 1, range + 1, range + na + pna,
208 /* Start with the parent range base. */
209 memcpy(result, range + na, pna * 4);
211 /* Add in the child address offset, skipping high cell. */
212 for (i = 0; i < na - 1; i++)
213 result[pna - 1 - i] +=
217 memcpy(addr, result, pna * 4);
222 static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
226 /* For PCI, we override whatever child busses may have used. */
228 switch((w >> 24) & 0x03) {
230 flags |= IORESOURCE_IO;
233 case 0x02: /* 32 bits */
234 case 0x03: /* 64 bits */
235 flags |= IORESOURCE_MEM;
239 flags |= IORESOURCE_PREFETCH;
244 * SBUS bus specific translator
247 static int of_bus_sbus_match(struct device_node *np)
249 struct device_node *dp = np;
252 if (!strcmp(dp->name, "sbus") ||
253 !strcmp(dp->name, "sbi"))
256 /* Have a look at use_1to1_mapping(). We're trying
257 * to match SBUS if that's the top-level bus and we
258 * don't have some intervening real bus that provides
259 * ranges based translations.
261 if (of_find_property(dp, "ranges", NULL) != NULL)
270 static void of_bus_sbus_count_cells(struct device_node *child,
271 int *addrc, int *sizec)
279 static int of_bus_sbus_map(u32 *addr, const u32 *range, int na, int ns, int pna)
281 return of_bus_default_map(addr, range, na, ns, pna);
284 static unsigned long of_bus_sbus_get_flags(const u32 *addr, unsigned long flags)
286 return IORESOURCE_MEM;
291 * Array of bus specific translators
294 static struct of_bus of_busses[] = {
298 .addr_prop_name = "assigned-addresses",
299 .match = of_bus_pci_match,
300 .count_cells = of_bus_pci_count_cells,
301 .map = of_bus_pci_map,
302 .get_flags = of_bus_pci_get_flags,
307 .addr_prop_name = "reg",
308 .match = of_bus_sbus_match,
309 .count_cells = of_bus_sbus_count_cells,
310 .map = of_bus_sbus_map,
311 .get_flags = of_bus_sbus_get_flags,
316 .addr_prop_name = "reg",
318 .count_cells = of_bus_default_count_cells,
319 .map = of_bus_default_map,
320 .get_flags = of_bus_default_get_flags,
324 static struct of_bus *of_match_bus(struct device_node *np)
328 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
329 if (!of_busses[i].match || of_busses[i].match(np))
330 return &of_busses[i];
335 static int __init build_one_resource(struct device_node *parent,
339 int na, int ns, int pna)
345 ranges = of_get_property(parent, "ranges", &rlen);
346 if (ranges == NULL || rlen == 0) {
347 u32 result[OF_MAX_ADDR_CELLS];
350 memset(result, 0, pna * 4);
351 for (i = 0; i < na; i++)
352 result[pna - 1 - i] =
355 memcpy(addr, result, pna * 4);
359 /* Now walk through the ranges */
361 rone = na + pna + ns;
362 for (; rlen >= rone; rlen -= rone, ranges += rone) {
363 if (!bus->map(addr, ranges, na, ns, pna))
370 static int __init use_1to1_mapping(struct device_node *pp)
372 /* If we have a ranges property in the parent, use it. */
373 if (of_find_property(pp, "ranges", NULL) != NULL)
376 /* Some SBUS devices use intermediate nodes to express
377 * hierarchy within the device itself. These aren't
378 * real bus nodes, and don't have a 'ranges' property.
379 * But, we should still pass the translation work up
380 * to the SBUS itself.
382 if (!strcmp(pp->name, "dma") ||
383 !strcmp(pp->name, "espdma") ||
384 !strcmp(pp->name, "ledma") ||
385 !strcmp(pp->name, "lebuffer"))
391 static int of_resource_verbose;
393 static void __init build_device_resources(struct of_device *op,
394 struct device *parent)
396 struct of_device *p_op;
405 p_op = to_of_device(parent);
406 bus = of_match_bus(p_op->node);
407 bus->count_cells(op->node, &na, &ns);
409 preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
410 if (!preg || num_reg == 0)
413 /* Convert to num-cells. */
416 /* Conver to num-entries. */
419 for (index = 0; index < num_reg; index++) {
420 struct resource *r = &op->resource[index];
421 u32 addr[OF_MAX_ADDR_CELLS];
422 const u32 *reg = (preg + (index * ((na + ns) * 4)));
423 struct device_node *dp = op->node;
424 struct device_node *pp = p_op->node;
425 struct of_bus *pbus, *dbus;
426 u64 size, result = OF_BAD_ADDR;
431 size = of_read_addr(reg + na, ns);
433 memcpy(addr, reg, na * 4);
435 flags = bus->get_flags(reg, 0);
437 if (use_1to1_mapping(pp)) {
438 result = of_read_addr(addr, na);
450 result = of_read_addr(addr, dna);
454 pbus = of_match_bus(pp);
455 pbus->count_cells(dp, &pna, &pns);
457 if (build_one_resource(dp, dbus, pbus, addr,
461 flags = pbus->get_flags(addr, flags);
469 memset(r, 0, sizeof(*r));
471 if (of_resource_verbose)
472 printk("%s reg[%d] -> %llx\n",
473 op->node->full_name, index,
476 if (result != OF_BAD_ADDR) {
477 r->start = result & 0xffffffff;
478 r->end = result + size - 1;
479 r->flags = flags | ((result >> 32ULL) & 0xffUL);
481 r->name = op->node->name;
485 static struct of_device * __init scan_one_device(struct device_node *dp,
486 struct device *parent)
488 struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
489 const struct linux_prom_irqs *intr;
490 struct dev_archdata *sd;
496 sd = &op->dev.archdata;
502 op->clock_freq = of_getintprop_default(dp, "clock-frequency",
504 op->portid = of_getintprop_default(dp, "upa-portid", -1);
505 if (op->portid == -1)
506 op->portid = of_getintprop_default(dp, "portid", -1);
508 intr = of_get_property(dp, "intr", &len);
510 op->num_irqs = len / sizeof(struct linux_prom_irqs);
511 for (i = 0; i < op->num_irqs; i++)
512 op->irqs[i] = intr[i].pri;
514 const unsigned int *irq =
515 of_get_property(dp, "interrupts", &len);
518 op->num_irqs = len / sizeof(unsigned int);
519 for (i = 0; i < op->num_irqs; i++)
520 op->irqs[i] = irq[i];
525 if (sparc_cpu_model == sun4d) {
526 static int pil_to_sbus[] = {
527 0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
529 struct device_node *io_unit, *sbi = dp->parent;
530 const struct linux_prom_registers *regs;
534 if (!strcmp(sbi->name, "sbi"))
540 goto build_resources;
542 regs = of_get_property(dp, "reg", NULL);
544 goto build_resources;
546 slot = regs->which_io;
548 /* If SBI's parent is not io-unit or the io-unit lacks
549 * a "board#" property, something is very wrong.
551 if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
552 printk("%s: Error, parent is not io-unit.\n",
554 goto build_resources;
556 io_unit = sbi->parent;
557 board = of_getintprop_default(io_unit, "board#", -1);
559 printk("%s: Error, lacks board# property.\n",
561 goto build_resources;
564 for (i = 0; i < op->num_irqs; i++) {
565 int this_irq = op->irqs[i];
566 int sbusl = pil_to_sbus[this_irq];
569 this_irq = (((board + 1) << 5) +
573 op->irqs[i] = this_irq;
578 build_device_resources(op, parent);
580 op->dev.parent = parent;
581 op->dev.bus = &of_platform_bus_type;
583 dev_set_name(&op->dev, "root");
585 dev_set_name(&op->dev, "%08x", dp->node);
587 if (of_device_register(op)) {
588 printk("%s: Could not register of device.\n",
597 static void __init scan_tree(struct device_node *dp, struct device *parent)
600 struct of_device *op = scan_one_device(dp, parent);
603 scan_tree(dp->child, &op->dev);
609 static void __init scan_of_devices(void)
611 struct device_node *root = of_find_node_by_path("/");
612 struct of_device *parent;
614 parent = scan_one_device(root, NULL);
618 scan_tree(root->child, &parent->dev);
621 static int __init of_bus_driver_init(void)
625 err = of_bus_type_init(&of_platform_bus_type, "of");
632 postcore_initcall(of_bus_driver_init);
634 static int __init of_debug(char *str)
638 get_option(&str, &val);
640 of_resource_verbose = 1;
644 __setup("of_debug=", of_debug);