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);
66 struct bus_type ebus_bus_type;
67 EXPORT_SYMBOL(ebus_bus_type);
70 struct bus_type of_platform_bus_type;
71 EXPORT_SYMBOL(of_platform_bus_type);
73 static inline u64 of_read_addr(const u32 *cell, int size)
77 r = (r << 32) | *(cell++);
81 static void __init get_cells(struct device_node *dp,
82 int *addrc, int *sizec)
85 *addrc = of_n_addr_cells(dp);
87 *sizec = of_n_size_cells(dp);
90 /* Max address size we deal with */
91 #define OF_MAX_ADDR_CELLS 4
95 const char *addr_prop_name;
96 int (*match)(struct device_node *parent);
97 void (*count_cells)(struct device_node *child,
98 int *addrc, int *sizec);
99 int (*map)(u32 *addr, const u32 *range,
100 int na, int ns, int pna);
101 unsigned int (*get_flags)(const u32 *addr);
105 * Default translator (generic bus)
108 static void of_bus_default_count_cells(struct device_node *dev,
109 int *addrc, int *sizec)
111 get_cells(dev, addrc, sizec);
114 /* Make sure the least significant 64-bits are in-range. Even
115 * for 3 or 4 cell values it is a good enough approximation.
117 static int of_out_of_range(const u32 *addr, const u32 *base,
118 const u32 *size, int na, int ns)
120 u64 a = of_read_addr(addr, na);
121 u64 b = of_read_addr(base, na);
126 b += of_read_addr(size, ns);
133 static int of_bus_default_map(u32 *addr, const u32 *range,
134 int na, int ns, int pna)
136 u32 result[OF_MAX_ADDR_CELLS];
140 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
144 if (of_out_of_range(addr, range, range + na + pna, na, ns))
147 /* Start with the parent range base. */
148 memcpy(result, range + na, pna * 4);
150 /* Add in the child address offset. */
151 for (i = 0; i < na; i++)
152 result[pna - 1 - i] +=
156 memcpy(addr, result, pna * 4);
161 static unsigned int of_bus_default_get_flags(const u32 *addr)
163 return IORESOURCE_MEM;
167 * PCI bus specific translator
170 static int of_bus_pci_match(struct device_node *np)
172 if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
173 /* Do not do PCI specific frobbing if the
174 * PCI bridge lacks a ranges property. We
175 * want to pass it through up to the next
176 * parent as-is, not with the PCI translate
177 * method which chops off the top address cell.
179 if (!of_find_property(np, "ranges", NULL))
188 static void of_bus_pci_count_cells(struct device_node *np,
189 int *addrc, int *sizec)
197 static int of_bus_pci_map(u32 *addr, const u32 *range,
198 int na, int ns, int pna)
200 u32 result[OF_MAX_ADDR_CELLS];
203 /* Check address type match */
204 if ((addr[0] ^ range[0]) & 0x03000000)
207 if (of_out_of_range(addr + 1, range + 1, range + na + pna,
211 /* Start with the parent range base. */
212 memcpy(result, range + na, pna * 4);
214 /* Add in the child address offset, skipping high cell. */
215 for (i = 0; i < na - 1; i++)
216 result[pna - 1 - i] +=
220 memcpy(addr, result, pna * 4);
225 static unsigned int of_bus_pci_get_flags(const u32 *addr)
227 unsigned int flags = 0;
230 switch((w >> 24) & 0x03) {
232 flags |= IORESOURCE_IO;
233 case 0x02: /* 32 bits */
234 case 0x03: /* 64 bits */
235 flags |= IORESOURCE_MEM;
238 flags |= IORESOURCE_PREFETCH;
243 * SBUS bus specific translator
246 static int of_bus_sbus_match(struct device_node *np)
248 return !strcmp(np->name, "sbus") ||
249 !strcmp(np->name, "sbi");
252 static void of_bus_sbus_count_cells(struct device_node *child,
253 int *addrc, int *sizec)
261 static int of_bus_sbus_map(u32 *addr, const u32 *range, int na, int ns, int pna)
263 return of_bus_default_map(addr, range, na, ns, pna);
266 static unsigned int of_bus_sbus_get_flags(const u32 *addr)
268 return IORESOURCE_MEM;
273 * Array of bus specific translators
276 static struct of_bus of_busses[] = {
280 .addr_prop_name = "assigned-addresses",
281 .match = of_bus_pci_match,
282 .count_cells = of_bus_pci_count_cells,
283 .map = of_bus_pci_map,
284 .get_flags = of_bus_pci_get_flags,
289 .addr_prop_name = "reg",
290 .match = of_bus_sbus_match,
291 .count_cells = of_bus_sbus_count_cells,
292 .map = of_bus_sbus_map,
293 .get_flags = of_bus_sbus_get_flags,
298 .addr_prop_name = "reg",
300 .count_cells = of_bus_default_count_cells,
301 .map = of_bus_default_map,
302 .get_flags = of_bus_default_get_flags,
306 static struct of_bus *of_match_bus(struct device_node *np)
310 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
311 if (!of_busses[i].match || of_busses[i].match(np))
312 return &of_busses[i];
317 static int __init build_one_resource(struct device_node *parent,
321 int na, int ns, int pna)
327 ranges = of_get_property(parent, "ranges", &rlen);
328 if (ranges == NULL || rlen == 0) {
329 u32 result[OF_MAX_ADDR_CELLS];
332 memset(result, 0, pna * 4);
333 for (i = 0; i < na; i++)
334 result[pna - 1 - i] =
337 memcpy(addr, result, pna * 4);
341 /* Now walk through the ranges */
343 rone = na + pna + ns;
344 for (; rlen >= rone; rlen -= rone, ranges += rone) {
345 if (!bus->map(addr, ranges, na, ns, pna))
352 static int of_resource_verbose;
354 static void __init build_device_resources(struct of_device *op,
355 struct device *parent)
357 struct of_device *p_op;
366 p_op = to_of_device(parent);
367 bus = of_match_bus(p_op->node);
368 bus->count_cells(op->node, &na, &ns);
370 preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
371 if (!preg || num_reg == 0)
374 /* Convert to num-cells. */
377 /* Conver to num-entries. */
380 for (index = 0; index < num_reg; index++) {
381 struct resource *r = &op->resource[index];
382 u32 addr[OF_MAX_ADDR_CELLS];
383 const u32 *reg = (preg + (index * ((na + ns) * 4)));
384 struct device_node *dp = op->node;
385 struct device_node *pp = p_op->node;
386 struct of_bus *pbus, *dbus;
387 u64 size, result = OF_BAD_ADDR;
392 size = of_read_addr(reg + na, ns);
393 flags = bus->get_flags(reg);
395 memcpy(addr, reg, na * 4);
397 /* If the immediate parent has no ranges property to apply,
398 * just use a 1<->1 mapping.
400 if (of_find_property(pp, "ranges", NULL) == NULL) {
401 result = of_read_addr(addr, na);
413 result = of_read_addr(addr, dna);
417 pbus = of_match_bus(pp);
418 pbus->count_cells(dp, &pna, &pns);
420 if (build_one_resource(dp, dbus, pbus, addr,
430 memset(r, 0, sizeof(*r));
432 if (of_resource_verbose)
433 printk("%s reg[%d] -> %llx\n",
434 op->node->full_name, index,
437 if (result != OF_BAD_ADDR) {
438 r->start = result & 0xffffffff;
439 r->end = result + size - 1;
440 r->flags = flags | ((result >> 32ULL) & 0xffUL);
442 r->name = op->node->name;
446 static struct of_device * __init scan_one_device(struct device_node *dp,
447 struct device *parent)
449 struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
450 const struct linux_prom_irqs *intr;
451 struct dev_archdata *sd;
457 sd = &op->dev.archdata;
463 op->clock_freq = of_getintprop_default(dp, "clock-frequency",
465 op->portid = of_getintprop_default(dp, "upa-portid", -1);
466 if (op->portid == -1)
467 op->portid = of_getintprop_default(dp, "portid", -1);
469 intr = of_get_property(dp, "intr", &len);
471 op->num_irqs = len / sizeof(struct linux_prom_irqs);
472 for (i = 0; i < op->num_irqs; i++)
473 op->irqs[i] = intr[i].pri;
475 const unsigned int *irq =
476 of_get_property(dp, "interrupts", &len);
479 op->num_irqs = len / sizeof(unsigned int);
480 for (i = 0; i < op->num_irqs; i++)
481 op->irqs[i] = irq[i];
486 if (sparc_cpu_model == sun4d) {
487 static int pil_to_sbus[] = {
488 0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
490 struct device_node *io_unit, *sbi = dp->parent;
491 const struct linux_prom_registers *regs;
495 if (!strcmp(sbi->name, "sbi"))
501 goto build_resources;
503 regs = of_get_property(dp, "reg", NULL);
505 goto build_resources;
507 slot = regs->which_io;
509 /* If SBI's parent is not io-unit or the io-unit lacks
510 * a "board#" property, something is very wrong.
512 if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
513 printk("%s: Error, parent is not io-unit.\n",
515 goto build_resources;
517 io_unit = sbi->parent;
518 board = of_getintprop_default(io_unit, "board#", -1);
520 printk("%s: Error, lacks board# property.\n",
522 goto build_resources;
525 for (i = 0; i < op->num_irqs; i++) {
526 int this_irq = op->irqs[i];
527 int sbusl = pil_to_sbus[this_irq];
530 this_irq = (((board + 1) << 5) +
534 op->irqs[i] = this_irq;
539 build_device_resources(op, parent);
541 op->dev.parent = parent;
542 op->dev.bus = &of_platform_bus_type;
544 strcpy(op->dev.bus_id, "root");
546 sprintf(op->dev.bus_id, "%08x", dp->node);
548 if (of_device_register(op)) {
549 printk("%s: Could not register of device.\n",
558 static void __init scan_tree(struct device_node *dp, struct device *parent)
561 struct of_device *op = scan_one_device(dp, parent);
564 scan_tree(dp->child, &op->dev);
570 static void __init scan_of_devices(void)
572 struct device_node *root = of_find_node_by_path("/");
573 struct of_device *parent;
575 parent = scan_one_device(root, NULL);
579 scan_tree(root->child, &parent->dev);
582 static int __init of_bus_driver_init(void)
586 err = of_bus_type_init(&of_platform_bus_type, "of");
589 err = of_bus_type_init(&ebus_bus_type, "ebus");
598 postcore_initcall(of_bus_driver_init);
600 static int __init of_debug(char *str)
604 get_option(&str, &val);
606 of_resource_verbose = 1;
610 __setup("of_debug=", of_debug);