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 int (*get_flags)(const u32 *addr);
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 int of_bus_default_get_flags(const u32 *addr)
158 return IORESOURCE_MEM;
162 * PCI bus specific translator
165 static int of_bus_pci_match(struct device_node *np)
167 if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
168 /* Do not do PCI specific frobbing if the
169 * PCI bridge lacks a ranges property. We
170 * want to pass it through up to the next
171 * parent as-is, not with the PCI translate
172 * method which chops off the top address cell.
174 if (!of_find_property(np, "ranges", NULL))
183 static void of_bus_pci_count_cells(struct device_node *np,
184 int *addrc, int *sizec)
192 static int of_bus_pci_map(u32 *addr, const u32 *range,
193 int na, int ns, int pna)
195 u32 result[OF_MAX_ADDR_CELLS];
198 /* Check address type match */
199 if ((addr[0] ^ range[0]) & 0x03000000)
202 if (of_out_of_range(addr + 1, range + 1, range + na + pna,
206 /* Start with the parent range base. */
207 memcpy(result, range + na, pna * 4);
209 /* Add in the child address offset, skipping high cell. */
210 for (i = 0; i < na - 1; i++)
211 result[pna - 1 - i] +=
215 memcpy(addr, result, pna * 4);
220 static unsigned int of_bus_pci_get_flags(const u32 *addr)
222 unsigned int flags = 0;
225 switch((w >> 24) & 0x03) {
227 flags |= IORESOURCE_IO;
228 case 0x02: /* 32 bits */
229 case 0x03: /* 64 bits */
230 flags |= IORESOURCE_MEM;
233 flags |= IORESOURCE_PREFETCH;
238 * SBUS bus specific translator
241 static int of_bus_sbus_match(struct device_node *np)
243 return !strcmp(np->name, "sbus") ||
244 !strcmp(np->name, "sbi");
247 static void of_bus_sbus_count_cells(struct device_node *child,
248 int *addrc, int *sizec)
256 static int of_bus_sbus_map(u32 *addr, const u32 *range, int na, int ns, int pna)
258 return of_bus_default_map(addr, range, na, ns, pna);
261 static unsigned int of_bus_sbus_get_flags(const u32 *addr)
263 return IORESOURCE_MEM;
268 * Array of bus specific translators
271 static struct of_bus of_busses[] = {
275 .addr_prop_name = "assigned-addresses",
276 .match = of_bus_pci_match,
277 .count_cells = of_bus_pci_count_cells,
278 .map = of_bus_pci_map,
279 .get_flags = of_bus_pci_get_flags,
284 .addr_prop_name = "reg",
285 .match = of_bus_sbus_match,
286 .count_cells = of_bus_sbus_count_cells,
287 .map = of_bus_sbus_map,
288 .get_flags = of_bus_sbus_get_flags,
293 .addr_prop_name = "reg",
295 .count_cells = of_bus_default_count_cells,
296 .map = of_bus_default_map,
297 .get_flags = of_bus_default_get_flags,
301 static struct of_bus *of_match_bus(struct device_node *np)
305 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
306 if (!of_busses[i].match || of_busses[i].match(np))
307 return &of_busses[i];
312 static int __init build_one_resource(struct device_node *parent,
316 int na, int ns, int pna)
322 ranges = of_get_property(parent, "ranges", &rlen);
323 if (ranges == NULL || rlen == 0) {
324 u32 result[OF_MAX_ADDR_CELLS];
327 memset(result, 0, pna * 4);
328 for (i = 0; i < na; i++)
329 result[pna - 1 - i] =
332 memcpy(addr, result, pna * 4);
336 /* Now walk through the ranges */
338 rone = na + pna + ns;
339 for (; rlen >= rone; rlen -= rone, ranges += rone) {
340 if (!bus->map(addr, ranges, na, ns, pna))
347 static int __init use_1to1_mapping(struct device_node *pp)
349 /* If we have a ranges property in the parent, use it. */
350 if (of_find_property(pp, "ranges", NULL) != NULL)
353 /* Some SBUS devices use intermediate nodes to express
354 * hierarchy within the device itself. These aren't
355 * real bus nodes, and don't have a 'ranges' property.
356 * But, we should still pass the translation work up
357 * to the SBUS itself.
359 if (!strcmp(pp->name, "dma") ||
360 !strcmp(pp->name, "espdma") ||
361 !strcmp(pp->name, "ledma") ||
362 !strcmp(pp->name, "lebuffer"))
368 static int of_resource_verbose;
370 static void __init build_device_resources(struct of_device *op,
371 struct device *parent)
373 struct of_device *p_op;
382 p_op = to_of_device(parent);
383 bus = of_match_bus(p_op->node);
384 bus->count_cells(op->node, &na, &ns);
386 preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
387 if (!preg || num_reg == 0)
390 /* Convert to num-cells. */
393 /* Conver to num-entries. */
396 for (index = 0; index < num_reg; index++) {
397 struct resource *r = &op->resource[index];
398 u32 addr[OF_MAX_ADDR_CELLS];
399 const u32 *reg = (preg + (index * ((na + ns) * 4)));
400 struct device_node *dp = op->node;
401 struct device_node *pp = p_op->node;
402 struct of_bus *pbus, *dbus;
403 u64 size, result = OF_BAD_ADDR;
408 size = of_read_addr(reg + na, ns);
409 flags = bus->get_flags(reg);
411 memcpy(addr, reg, na * 4);
413 if (use_1to1_mapping(pp)) {
414 result = of_read_addr(addr, na);
426 result = of_read_addr(addr, dna);
430 pbus = of_match_bus(pp);
431 pbus->count_cells(dp, &pna, &pns);
433 if (build_one_resource(dp, dbus, pbus, addr,
443 memset(r, 0, sizeof(*r));
445 if (of_resource_verbose)
446 printk("%s reg[%d] -> %llx\n",
447 op->node->full_name, index,
450 if (result != OF_BAD_ADDR) {
451 r->start = result & 0xffffffff;
452 r->end = result + size - 1;
453 r->flags = flags | ((result >> 32ULL) & 0xffUL);
455 r->name = op->node->name;
459 static struct of_device * __init scan_one_device(struct device_node *dp,
460 struct device *parent)
462 struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
463 const struct linux_prom_irqs *intr;
464 struct dev_archdata *sd;
470 sd = &op->dev.archdata;
476 op->clock_freq = of_getintprop_default(dp, "clock-frequency",
478 op->portid = of_getintprop_default(dp, "upa-portid", -1);
479 if (op->portid == -1)
480 op->portid = of_getintprop_default(dp, "portid", -1);
482 intr = of_get_property(dp, "intr", &len);
484 op->num_irqs = len / sizeof(struct linux_prom_irqs);
485 for (i = 0; i < op->num_irqs; i++)
486 op->irqs[i] = intr[i].pri;
488 const unsigned int *irq =
489 of_get_property(dp, "interrupts", &len);
492 op->num_irqs = len / sizeof(unsigned int);
493 for (i = 0; i < op->num_irqs; i++)
494 op->irqs[i] = irq[i];
499 if (sparc_cpu_model == sun4d) {
500 static int pil_to_sbus[] = {
501 0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
503 struct device_node *io_unit, *sbi = dp->parent;
504 const struct linux_prom_registers *regs;
508 if (!strcmp(sbi->name, "sbi"))
514 goto build_resources;
516 regs = of_get_property(dp, "reg", NULL);
518 goto build_resources;
520 slot = regs->which_io;
522 /* If SBI's parent is not io-unit or the io-unit lacks
523 * a "board#" property, something is very wrong.
525 if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
526 printk("%s: Error, parent is not io-unit.\n",
528 goto build_resources;
530 io_unit = sbi->parent;
531 board = of_getintprop_default(io_unit, "board#", -1);
533 printk("%s: Error, lacks board# property.\n",
535 goto build_resources;
538 for (i = 0; i < op->num_irqs; i++) {
539 int this_irq = op->irqs[i];
540 int sbusl = pil_to_sbus[this_irq];
543 this_irq = (((board + 1) << 5) +
547 op->irqs[i] = this_irq;
552 build_device_resources(op, parent);
554 op->dev.parent = parent;
555 op->dev.bus = &of_platform_bus_type;
557 strcpy(op->dev.bus_id, "root");
559 sprintf(op->dev.bus_id, "%08x", dp->node);
561 if (of_device_register(op)) {
562 printk("%s: Could not register of device.\n",
571 static void __init scan_tree(struct device_node *dp, struct device *parent)
574 struct of_device *op = scan_one_device(dp, parent);
577 scan_tree(dp->child, &op->dev);
583 static void __init scan_of_devices(void)
585 struct device_node *root = of_find_node_by_path("/");
586 struct of_device *parent;
588 parent = scan_one_device(root, NULL);
592 scan_tree(root->child, &parent->dev);
595 static int __init of_bus_driver_init(void)
599 err = of_bus_type_init(&of_platform_bus_type, "of");
606 postcore_initcall(of_bus_driver_init);
608 static int __init of_debug(char *str)
612 get_option(&str, &val);
614 of_resource_verbose = 1;
618 __setup("of_debug=", of_debug);