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>
10 #include <linux/of_device.h>
11 #include <linux/of_platform.h>
13 #include "of_device_common.h"
16 * PCI bus specific translator
19 static int of_bus_pci_match(struct device_node *np)
21 if (!strcmp(np->type, "pci") || !strcmp(np->type, "pciex")) {
22 /* Do not do PCI specific frobbing if the
23 * PCI bridge lacks a ranges property. We
24 * want to pass it through up to the next
25 * parent as-is, not with the PCI translate
26 * method which chops off the top address cell.
28 if (!of_find_property(np, "ranges", NULL))
37 static void of_bus_pci_count_cells(struct device_node *np,
38 int *addrc, int *sizec)
46 static int of_bus_pci_map(u32 *addr, const u32 *range,
47 int na, int ns, int pna)
49 u32 result[OF_MAX_ADDR_CELLS];
52 /* Check address type match */
53 if ((addr[0] ^ range[0]) & 0x03000000)
56 if (of_out_of_range(addr + 1, range + 1, range + na + pna,
60 /* Start with the parent range base. */
61 memcpy(result, range + na, pna * 4);
63 /* Add in the child address offset, skipping high cell. */
64 for (i = 0; i < na - 1; i++)
65 result[pna - 1 - i] +=
69 memcpy(addr, result, pna * 4);
74 static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
78 /* For PCI, we override whatever child busses may have used. */
80 switch((w >> 24) & 0x03) {
82 flags |= IORESOURCE_IO;
85 case 0x02: /* 32 bits */
86 case 0x03: /* 64 bits */
87 flags |= IORESOURCE_MEM;
91 flags |= IORESOURCE_PREFETCH;
95 static unsigned long of_bus_sbus_get_flags(const u32 *addr, unsigned long flags)
97 return IORESOURCE_MEM;
102 * Array of bus specific translators
105 static struct of_bus of_busses[] = {
109 .addr_prop_name = "assigned-addresses",
110 .match = of_bus_pci_match,
111 .count_cells = of_bus_pci_count_cells,
112 .map = of_bus_pci_map,
113 .get_flags = of_bus_pci_get_flags,
118 .addr_prop_name = "reg",
119 .match = of_bus_sbus_match,
120 .count_cells = of_bus_sbus_count_cells,
121 .map = of_bus_default_map,
122 .get_flags = of_bus_sbus_get_flags,
127 .addr_prop_name = "reg",
129 .count_cells = of_bus_default_count_cells,
130 .map = of_bus_default_map,
131 .get_flags = of_bus_default_get_flags,
135 static struct of_bus *of_match_bus(struct device_node *np)
139 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
140 if (!of_busses[i].match || of_busses[i].match(np))
141 return &of_busses[i];
146 static int __init build_one_resource(struct device_node *parent,
150 int na, int ns, int pna)
156 ranges = of_get_property(parent, "ranges", &rlen);
157 if (ranges == NULL || rlen == 0) {
158 u32 result[OF_MAX_ADDR_CELLS];
161 memset(result, 0, pna * 4);
162 for (i = 0; i < na; i++)
163 result[pna - 1 - i] =
166 memcpy(addr, result, pna * 4);
170 /* Now walk through the ranges */
172 rone = na + pna + ns;
173 for (; rlen >= rone; rlen -= rone, ranges += rone) {
174 if (!bus->map(addr, ranges, na, ns, pna))
181 static int __init use_1to1_mapping(struct device_node *pp)
183 /* If we have a ranges property in the parent, use it. */
184 if (of_find_property(pp, "ranges", NULL) != NULL)
187 /* Some SBUS devices use intermediate nodes to express
188 * hierarchy within the device itself. These aren't
189 * real bus nodes, and don't have a 'ranges' property.
190 * But, we should still pass the translation work up
191 * to the SBUS itself.
193 if (!strcmp(pp->name, "dma") ||
194 !strcmp(pp->name, "espdma") ||
195 !strcmp(pp->name, "ledma") ||
196 !strcmp(pp->name, "lebuffer"))
202 static int of_resource_verbose;
204 static void __init build_device_resources(struct of_device *op,
205 struct device *parent)
207 struct of_device *p_op;
216 p_op = to_of_device(parent);
217 bus = of_match_bus(p_op->node);
218 bus->count_cells(op->node, &na, &ns);
220 preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
221 if (!preg || num_reg == 0)
224 /* Convert to num-cells. */
227 /* Conver to num-entries. */
230 for (index = 0; index < num_reg; index++) {
231 struct resource *r = &op->resource[index];
232 u32 addr[OF_MAX_ADDR_CELLS];
233 const u32 *reg = (preg + (index * ((na + ns) * 4)));
234 struct device_node *dp = op->node;
235 struct device_node *pp = p_op->node;
236 struct of_bus *pbus, *dbus;
237 u64 size, result = OF_BAD_ADDR;
242 size = of_read_addr(reg + na, ns);
244 memcpy(addr, reg, na * 4);
246 flags = bus->get_flags(reg, 0);
248 if (use_1to1_mapping(pp)) {
249 result = of_read_addr(addr, na);
261 result = of_read_addr(addr, dna);
265 pbus = of_match_bus(pp);
266 pbus->count_cells(dp, &pna, &pns);
268 if (build_one_resource(dp, dbus, pbus, addr,
272 flags = pbus->get_flags(addr, flags);
280 memset(r, 0, sizeof(*r));
282 if (of_resource_verbose)
283 printk("%s reg[%d] -> %llx\n",
284 op->node->full_name, index,
287 if (result != OF_BAD_ADDR) {
288 r->start = result & 0xffffffff;
289 r->end = result + size - 1;
290 r->flags = flags | ((result >> 32ULL) & 0xffUL);
292 r->name = op->node->name;
296 static struct of_device * __init scan_one_device(struct device_node *dp,
297 struct device *parent)
299 struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
300 const struct linux_prom_irqs *intr;
301 struct dev_archdata *sd;
307 sd = &op->dev.archdata;
313 op->clock_freq = of_getintprop_default(dp, "clock-frequency",
315 op->portid = of_getintprop_default(dp, "upa-portid", -1);
316 if (op->portid == -1)
317 op->portid = of_getintprop_default(dp, "portid", -1);
319 intr = of_get_property(dp, "intr", &len);
321 op->num_irqs = len / sizeof(struct linux_prom_irqs);
322 for (i = 0; i < op->num_irqs; i++)
323 op->irqs[i] = intr[i].pri;
325 const unsigned int *irq =
326 of_get_property(dp, "interrupts", &len);
329 op->num_irqs = len / sizeof(unsigned int);
330 for (i = 0; i < op->num_irqs; i++)
331 op->irqs[i] = irq[i];
336 if (sparc_cpu_model == sun4d) {
337 static int pil_to_sbus[] = {
338 0, 0, 1, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 0, 0,
340 struct device_node *io_unit, *sbi = dp->parent;
341 const struct linux_prom_registers *regs;
345 if (!strcmp(sbi->name, "sbi"))
351 goto build_resources;
353 regs = of_get_property(dp, "reg", NULL);
355 goto build_resources;
357 slot = regs->which_io;
359 /* If SBI's parent is not io-unit or the io-unit lacks
360 * a "board#" property, something is very wrong.
362 if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
363 printk("%s: Error, parent is not io-unit.\n",
365 goto build_resources;
367 io_unit = sbi->parent;
368 board = of_getintprop_default(io_unit, "board#", -1);
370 printk("%s: Error, lacks board# property.\n",
372 goto build_resources;
375 for (i = 0; i < op->num_irqs; i++) {
376 int this_irq = op->irqs[i];
377 int sbusl = pil_to_sbus[this_irq];
380 this_irq = (((board + 1) << 5) +
384 op->irqs[i] = this_irq;
389 build_device_resources(op, parent);
391 op->dev.parent = parent;
392 op->dev.bus = &of_platform_bus_type;
394 dev_set_name(&op->dev, "root");
396 dev_set_name(&op->dev, "%08x", dp->node);
398 if (of_device_register(op)) {
399 printk("%s: Could not register of device.\n",
408 static void __init scan_tree(struct device_node *dp, struct device *parent)
411 struct of_device *op = scan_one_device(dp, parent);
414 scan_tree(dp->child, &op->dev);
420 static void __init scan_of_devices(void)
422 struct device_node *root = of_find_node_by_path("/");
423 struct of_device *parent;
425 parent = scan_one_device(root, NULL);
429 scan_tree(root->child, &parent->dev);
432 static int __init of_bus_driver_init(void)
436 err = of_bus_type_init(&of_platform_bus_type, "of");
443 postcore_initcall(of_bus_driver_init);
445 static int __init of_debug(char *str)
449 get_option(&str, &val);
451 of_resource_verbose = 1;
455 __setup("of_debug=", of_debug);