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);
44 struct bus_type ebus_bus_type;
45 EXPORT_SYMBOL(ebus_bus_type);
49 struct bus_type sbus_bus_type;
50 EXPORT_SYMBOL(sbus_bus_type);
53 struct bus_type of_platform_bus_type;
54 EXPORT_SYMBOL(of_platform_bus_type);
56 static inline u64 of_read_addr(const u32 *cell, int size)
60 r = (r << 32) | *(cell++);
64 static void __init get_cells(struct device_node *dp,
65 int *addrc, int *sizec)
68 *addrc = of_n_addr_cells(dp);
70 *sizec = of_n_size_cells(dp);
73 /* Max address size we deal with */
74 #define OF_MAX_ADDR_CELLS 4
78 const char *addr_prop_name;
79 int (*match)(struct device_node *parent);
80 void (*count_cells)(struct device_node *child,
81 int *addrc, int *sizec);
82 int (*map)(u32 *addr, const u32 *range,
83 int na, int ns, int pna);
84 unsigned int (*get_flags)(const u32 *addr);
88 * Default translator (generic bus)
91 static void of_bus_default_count_cells(struct device_node *dev,
92 int *addrc, int *sizec)
94 get_cells(dev, addrc, sizec);
97 /* Make sure the least significant 64-bits are in-range. Even
98 * for 3 or 4 cell values it is a good enough approximation.
100 static int of_out_of_range(const u32 *addr, const u32 *base,
101 const u32 *size, int na, int ns)
103 u64 a = of_read_addr(addr, na);
104 u64 b = of_read_addr(base, na);
109 b += of_read_addr(size, ns);
116 static int of_bus_default_map(u32 *addr, const u32 *range,
117 int na, int ns, int pna)
119 u32 result[OF_MAX_ADDR_CELLS];
123 printk("of_device: Cannot handle size cells (%d) > 2.", ns);
127 if (of_out_of_range(addr, range, range + na + pna, na, ns))
130 /* Start with the parent range base. */
131 memcpy(result, range + na, pna * 4);
133 /* Add in the child address offset. */
134 for (i = 0; i < na; i++)
135 result[pna - 1 - i] +=
139 memcpy(addr, result, pna * 4);
144 static unsigned int of_bus_default_get_flags(const u32 *addr)
146 return IORESOURCE_MEM;
150 * PCI bus specific translator
153 static int of_bus_pci_match(struct device_node *np)
155 if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
156 /* Do not do PCI specific frobbing if the
157 * PCI bridge lacks a ranges property. We
158 * want to pass it through up to the next
159 * parent as-is, not with the PCI translate
160 * method which chops off the top address cell.
162 if (!of_find_property(np, "ranges", NULL))
171 static void of_bus_pci_count_cells(struct device_node *np,
172 int *addrc, int *sizec)
180 static int of_bus_pci_map(u32 *addr, const u32 *range,
181 int na, int ns, int pna)
183 u32 result[OF_MAX_ADDR_CELLS];
186 /* Check address type match */
187 if ((addr[0] ^ range[0]) & 0x03000000)
190 if (of_out_of_range(addr + 1, range + 1, range + na + pna,
194 /* Start with the parent range base. */
195 memcpy(result, range + na, pna * 4);
197 /* Add in the child address offset, skipping high cell. */
198 for (i = 0; i < na - 1; i++)
199 result[pna - 1 - i] +=
203 memcpy(addr, result, pna * 4);
208 static unsigned int of_bus_pci_get_flags(const u32 *addr)
210 unsigned int flags = 0;
213 switch((w >> 24) & 0x03) {
215 flags |= IORESOURCE_IO;
216 case 0x02: /* 32 bits */
217 case 0x03: /* 64 bits */
218 flags |= IORESOURCE_MEM;
221 flags |= IORESOURCE_PREFETCH;
226 * SBUS bus specific translator
229 static int of_bus_sbus_match(struct device_node *np)
231 return !strcmp(np->name, "sbus") ||
232 !strcmp(np->name, "sbi");
235 static void of_bus_sbus_count_cells(struct device_node *child,
236 int *addrc, int *sizec)
244 static int of_bus_sbus_map(u32 *addr, const u32 *range, int na, int ns, int pna)
246 return of_bus_default_map(addr, range, na, ns, pna);
249 static unsigned int of_bus_sbus_get_flags(const u32 *addr)
251 return IORESOURCE_MEM;
256 * Array of bus specific translators
259 static struct of_bus of_busses[] = {
263 .addr_prop_name = "assigned-addresses",
264 .match = of_bus_pci_match,
265 .count_cells = of_bus_pci_count_cells,
266 .map = of_bus_pci_map,
267 .get_flags = of_bus_pci_get_flags,
272 .addr_prop_name = "reg",
273 .match = of_bus_sbus_match,
274 .count_cells = of_bus_sbus_count_cells,
275 .map = of_bus_sbus_map,
276 .get_flags = of_bus_sbus_get_flags,
281 .addr_prop_name = "reg",
283 .count_cells = of_bus_default_count_cells,
284 .map = of_bus_default_map,
285 .get_flags = of_bus_default_get_flags,
289 static struct of_bus *of_match_bus(struct device_node *np)
293 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
294 if (!of_busses[i].match || of_busses[i].match(np))
295 return &of_busses[i];
300 static int __init build_one_resource(struct device_node *parent,
304 int na, int ns, int pna)
310 ranges = of_get_property(parent, "ranges", &rlen);
311 if (ranges == NULL || rlen == 0) {
312 u32 result[OF_MAX_ADDR_CELLS];
315 memset(result, 0, pna * 4);
316 for (i = 0; i < na; i++)
317 result[pna - 1 - i] =
320 memcpy(addr, result, pna * 4);
324 /* Now walk through the ranges */
326 rone = na + pna + ns;
327 for (; rlen >= rone; rlen -= rone, ranges += rone) {
328 if (!bus->map(addr, ranges, na, ns, pna))
335 static int of_resource_verbose;
337 static void __init build_device_resources(struct of_device *op,
338 struct device *parent)
340 struct of_device *p_op;
349 p_op = to_of_device(parent);
350 bus = of_match_bus(p_op->node);
351 bus->count_cells(op->node, &na, &ns);
353 preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
354 if (!preg || num_reg == 0)
357 /* Convert to num-cells. */
360 /* Conver to num-entries. */
363 for (index = 0; index < num_reg; index++) {
364 struct resource *r = &op->resource[index];
365 u32 addr[OF_MAX_ADDR_CELLS];
366 const u32 *reg = (preg + (index * ((na + ns) * 4)));
367 struct device_node *dp = op->node;
368 struct device_node *pp = p_op->node;
369 struct of_bus *pbus, *dbus;
370 u64 size, result = OF_BAD_ADDR;
375 size = of_read_addr(reg + na, ns);
376 flags = bus->get_flags(reg);
378 memcpy(addr, reg, na * 4);
380 /* If the immediate parent has no ranges property to apply,
381 * just use a 1<->1 mapping.
383 if (of_find_property(pp, "ranges", NULL) == NULL) {
384 result = of_read_addr(addr, na);
396 result = of_read_addr(addr, dna);
400 pbus = of_match_bus(pp);
401 pbus->count_cells(dp, &pna, &pns);
403 if (build_one_resource(dp, dbus, pbus, addr,
413 memset(r, 0, sizeof(*r));
415 if (of_resource_verbose)
416 printk("%s reg[%d] -> %llx\n",
417 op->node->full_name, index,
420 if (result != OF_BAD_ADDR) {
421 r->start = result & 0xffffffff;
422 r->end = result + size - 1;
423 r->flags = flags | ((result >> 32ULL) & 0xffUL);
425 r->name = op->node->name;
429 static struct of_device * __init scan_one_device(struct device_node *dp,
430 struct device *parent)
432 struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
433 const struct linux_prom_irqs *intr;
434 struct dev_archdata *sd;
440 sd = &op->dev.archdata;
446 op->clock_freq = of_getintprop_default(dp, "clock-frequency",
448 op->portid = of_getintprop_default(dp, "upa-portid", -1);
449 if (op->portid == -1)
450 op->portid = of_getintprop_default(dp, "portid", -1);
452 intr = of_get_property(dp, "intr", &len);
454 op->num_irqs = len / sizeof(struct linux_prom_irqs);
455 for (i = 0; i < op->num_irqs; i++)
456 op->irqs[i] = intr[i].pri;
458 const unsigned int *irq =
459 of_get_property(dp, "interrupts", &len);
462 op->num_irqs = len / sizeof(unsigned int);
463 for (i = 0; i < op->num_irqs; i++)
464 op->irqs[i] = irq[i];
469 if (sparc_cpu_model == sun4d) {
470 static int pil_to_sbus[] = {
471 0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
473 struct device_node *io_unit, *sbi = dp->parent;
474 const struct linux_prom_registers *regs;
478 if (!strcmp(sbi->name, "sbi"))
484 goto build_resources;
486 regs = of_get_property(dp, "reg", NULL);
488 goto build_resources;
490 slot = regs->which_io;
492 /* If SBI's parent is not io-unit or the io-unit lacks
493 * a "board#" property, something is very wrong.
495 if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
496 printk("%s: Error, parent is not io-unit.\n",
498 goto build_resources;
500 io_unit = sbi->parent;
501 board = of_getintprop_default(io_unit, "board#", -1);
503 printk("%s: Error, lacks board# property.\n",
505 goto build_resources;
508 for (i = 0; i < op->num_irqs; i++) {
509 int this_irq = op->irqs[i];
510 int sbusl = pil_to_sbus[this_irq];
513 this_irq = (((board + 1) << 5) +
517 op->irqs[i] = this_irq;
522 build_device_resources(op, parent);
524 op->dev.parent = parent;
525 op->dev.bus = &of_platform_bus_type;
527 strcpy(op->dev.bus_id, "root");
529 sprintf(op->dev.bus_id, "%08x", dp->node);
531 if (of_device_register(op)) {
532 printk("%s: Could not register of device.\n",
541 static void __init scan_tree(struct device_node *dp, struct device *parent)
544 struct of_device *op = scan_one_device(dp, parent);
547 scan_tree(dp->child, &op->dev);
553 static void __init scan_of_devices(void)
555 struct device_node *root = of_find_node_by_path("/");
556 struct of_device *parent;
558 parent = scan_one_device(root, NULL);
562 scan_tree(root->child, &parent->dev);
565 static int __init of_bus_driver_init(void)
569 err = of_bus_type_init(&of_platform_bus_type, "of");
572 err = of_bus_type_init(&ebus_bus_type, "ebus");
576 err = of_bus_type_init(&sbus_bus_type, "sbus");
585 postcore_initcall(of_bus_driver_init);
587 static int __init of_debug(char *str)
591 get_option(&str, &val);
593 of_resource_verbose = 1;
597 __setup("of_debug=", of_debug);