Merge branch 'for-2.6.31' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[linux-2.6] / arch / sparc / kernel / of_device_32.c
1 #include <linux/string.h>
2 #include <linux/kernel.h>
3 #include <linux/of.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/irq.h>
10 #include <linux/of_device.h>
11 #include <linux/of_platform.h>
12
13 #include "of_device_common.h"
14
15 /*
16  * PCI bus specific translator
17  */
18
19 static int of_bus_pci_match(struct device_node *np)
20 {
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.
27                  */
28                 if (!of_find_property(np, "ranges", NULL))
29                         return 0;
30
31                 return 1;
32         }
33
34         return 0;
35 }
36
37 static void of_bus_pci_count_cells(struct device_node *np,
38                                    int *addrc, int *sizec)
39 {
40         if (addrc)
41                 *addrc = 3;
42         if (sizec)
43                 *sizec = 2;
44 }
45
46 static int of_bus_pci_map(u32 *addr, const u32 *range,
47                           int na, int ns, int pna)
48 {
49         u32 result[OF_MAX_ADDR_CELLS];
50         int i;
51
52         /* Check address type match */
53         if ((addr[0] ^ range[0]) & 0x03000000)
54                 return -EINVAL;
55
56         if (of_out_of_range(addr + 1, range + 1, range + na + pna,
57                             na - 1, ns))
58                 return -EINVAL;
59
60         /* Start with the parent range base.  */
61         memcpy(result, range + na, pna * 4);
62
63         /* Add in the child address offset, skipping high cell.  */
64         for (i = 0; i < na - 1; i++)
65                 result[pna - 1 - i] +=
66                         (addr[na - 1 - i] -
67                          range[na - 1 - i]);
68
69         memcpy(addr, result, pna * 4);
70
71         return 0;
72 }
73
74 static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
75 {
76         u32 w = addr[0];
77
78         /* For PCI, we override whatever child busses may have used.  */
79         flags = 0;
80         switch((w >> 24) & 0x03) {
81         case 0x01:
82                 flags |= IORESOURCE_IO;
83                 break;
84
85         case 0x02: /* 32 bits */
86         case 0x03: /* 64 bits */
87                 flags |= IORESOURCE_MEM;
88                 break;
89         }
90         if (w & 0x40000000)
91                 flags |= IORESOURCE_PREFETCH;
92         return flags;
93 }
94
95 static unsigned long of_bus_sbus_get_flags(const u32 *addr, unsigned long flags)
96 {
97         return IORESOURCE_MEM;
98 }
99
100
101 /*
102  * Array of bus specific translators
103  */
104
105 static struct of_bus of_busses[] = {
106         /* PCI */
107         {
108                 .name = "pci",
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,
114         },
115         /* SBUS */
116         {
117                 .name = "sbus",
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,
123         },
124         /* Default */
125         {
126                 .name = "default",
127                 .addr_prop_name = "reg",
128                 .match = NULL,
129                 .count_cells = of_bus_default_count_cells,
130                 .map = of_bus_default_map,
131                 .get_flags = of_bus_default_get_flags,
132         },
133 };
134
135 static struct of_bus *of_match_bus(struct device_node *np)
136 {
137         int i;
138
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];
142         BUG();
143         return NULL;
144 }
145
146 static int __init build_one_resource(struct device_node *parent,
147                                      struct of_bus *bus,
148                                      struct of_bus *pbus,
149                                      u32 *addr,
150                                      int na, int ns, int pna)
151 {
152         const u32 *ranges;
153         unsigned int rlen;
154         int rone;
155
156         ranges = of_get_property(parent, "ranges", &rlen);
157         if (ranges == NULL || rlen == 0) {
158                 u32 result[OF_MAX_ADDR_CELLS];
159                 int i;
160
161                 memset(result, 0, pna * 4);
162                 for (i = 0; i < na; i++)
163                         result[pna - 1 - i] =
164                                 addr[na - 1 - i];
165
166                 memcpy(addr, result, pna * 4);
167                 return 0;
168         }
169
170         /* Now walk through the ranges */
171         rlen /= 4;
172         rone = na + pna + ns;
173         for (; rlen >= rone; rlen -= rone, ranges += rone) {
174                 if (!bus->map(addr, ranges, na, ns, pna))
175                         return 0;
176         }
177
178         return 1;
179 }
180
181 static int __init use_1to1_mapping(struct device_node *pp)
182 {
183         /* If we have a ranges property in the parent, use it.  */
184         if (of_find_property(pp, "ranges", NULL) != NULL)
185                 return 0;
186
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.
192          */
193         if (!strcmp(pp->name, "dma") ||
194             !strcmp(pp->name, "espdma") ||
195             !strcmp(pp->name, "ledma") ||
196             !strcmp(pp->name, "lebuffer"))
197                 return 0;
198
199         return 1;
200 }
201
202 static int of_resource_verbose;
203
204 static void __init build_device_resources(struct of_device *op,
205                                           struct device *parent)
206 {
207         struct of_device *p_op;
208         struct of_bus *bus;
209         int na, ns;
210         int index, num_reg;
211         const void *preg;
212
213         if (!parent)
214                 return;
215
216         p_op = to_of_device(parent);
217         bus = of_match_bus(p_op->node);
218         bus->count_cells(op->node, &na, &ns);
219
220         preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
221         if (!preg || num_reg == 0)
222                 return;
223
224         /* Convert to num-cells.  */
225         num_reg /= 4;
226
227         /* Conver to num-entries.  */
228         num_reg /= na + ns;
229
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;
238                 unsigned long flags;
239                 int dna, dns;
240                 int pna, pns;
241
242                 size = of_read_addr(reg + na, ns);
243
244                 memcpy(addr, reg, na * 4);
245
246                 flags = bus->get_flags(reg, 0);
247
248                 if (use_1to1_mapping(pp)) {
249                         result = of_read_addr(addr, na);
250                         goto build_res;
251                 }
252
253                 dna = na;
254                 dns = ns;
255                 dbus = bus;
256
257                 while (1) {
258                         dp = pp;
259                         pp = dp->parent;
260                         if (!pp) {
261                                 result = of_read_addr(addr, dna);
262                                 break;
263                         }
264
265                         pbus = of_match_bus(pp);
266                         pbus->count_cells(dp, &pna, &pns);
267
268                         if (build_one_resource(dp, dbus, pbus, addr,
269                                                dna, dns, pna))
270                                 break;
271
272                         flags = pbus->get_flags(addr, flags);
273
274                         dna = pna;
275                         dns = pns;
276                         dbus = pbus;
277                 }
278
279         build_res:
280                 memset(r, 0, sizeof(*r));
281
282                 if (of_resource_verbose)
283                         printk("%s reg[%d] -> %llx\n",
284                                op->node->full_name, index,
285                                result);
286
287                 if (result != OF_BAD_ADDR) {
288                         r->start = result & 0xffffffff;
289                         r->end = result + size - 1;
290                         r->flags = flags | ((result >> 32ULL) & 0xffUL);
291                 }
292                 r->name = op->node->name;
293         }
294 }
295
296 static struct of_device * __init scan_one_device(struct device_node *dp,
297                                                  struct device *parent)
298 {
299         struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
300         const struct linux_prom_irqs *intr;
301         struct dev_archdata *sd;
302         int len, i;
303
304         if (!op)
305                 return NULL;
306
307         sd = &op->dev.archdata;
308         sd->prom_node = dp;
309         sd->op = op;
310
311         op->node = dp;
312
313         op->clock_freq = of_getintprop_default(dp, "clock-frequency",
314                                                (25*1000*1000));
315         op->portid = of_getintprop_default(dp, "upa-portid", -1);
316         if (op->portid == -1)
317                 op->portid = of_getintprop_default(dp, "portid", -1);
318
319         intr = of_get_property(dp, "intr", &len);
320         if (intr) {
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;
324         } else {
325                 const unsigned int *irq =
326                         of_get_property(dp, "interrupts", &len);
327
328                 if (irq) {
329                         op->num_irqs = len / sizeof(unsigned int);
330                         for (i = 0; i < op->num_irqs; i++)
331                                 op->irqs[i] = irq[i];
332                 } else {
333                         op->num_irqs = 0;
334                 }
335         }
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,
339                 };
340                 struct device_node *io_unit, *sbi = dp->parent;
341                 const struct linux_prom_registers *regs;
342                 int board, slot;
343
344                 while (sbi) {
345                         if (!strcmp(sbi->name, "sbi"))
346                                 break;
347
348                         sbi = sbi->parent;
349                 }
350                 if (!sbi)
351                         goto build_resources;
352
353                 regs = of_get_property(dp, "reg", NULL);
354                 if (!regs)
355                         goto build_resources;
356
357                 slot = regs->which_io;
358
359                 /* If SBI's parent is not io-unit or the io-unit lacks
360                  * a "board#" property, something is very wrong.
361                  */
362                 if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
363                         printk("%s: Error, parent is not io-unit.\n",
364                                sbi->full_name);
365                         goto build_resources;
366                 }
367                 io_unit = sbi->parent;
368                 board = of_getintprop_default(io_unit, "board#", -1);
369                 if (board == -1) {
370                         printk("%s: Error, lacks board# property.\n",
371                                io_unit->full_name);
372                         goto build_resources;
373                 }
374
375                 for (i = 0; i < op->num_irqs; i++) {
376                         int this_irq = op->irqs[i];
377                         int sbusl = pil_to_sbus[this_irq];
378
379                         if (sbusl)
380                                 this_irq = (((board + 1) << 5) +
381                                             (sbusl << 2) +
382                                             slot);
383
384                         op->irqs[i] = this_irq;
385                 }
386         }
387
388 build_resources:
389         build_device_resources(op, parent);
390
391         op->dev.parent = parent;
392         op->dev.bus = &of_platform_bus_type;
393         if (!parent)
394                 dev_set_name(&op->dev, "root");
395         else
396                 dev_set_name(&op->dev, "%08x", dp->node);
397
398         if (of_device_register(op)) {
399                 printk("%s: Could not register of device.\n",
400                        dp->full_name);
401                 kfree(op);
402                 op = NULL;
403         }
404
405         return op;
406 }
407
408 static void __init scan_tree(struct device_node *dp, struct device *parent)
409 {
410         while (dp) {
411                 struct of_device *op = scan_one_device(dp, parent);
412
413                 if (op)
414                         scan_tree(dp->child, &op->dev);
415
416                 dp = dp->sibling;
417         }
418 }
419
420 static void __init scan_of_devices(void)
421 {
422         struct device_node *root = of_find_node_by_path("/");
423         struct of_device *parent;
424
425         parent = scan_one_device(root, NULL);
426         if (!parent)
427                 return;
428
429         scan_tree(root->child, &parent->dev);
430 }
431
432 static int __init of_bus_driver_init(void)
433 {
434         int err;
435
436         err = of_bus_type_init(&of_platform_bus_type, "of");
437         if (!err)
438                 scan_of_devices();
439
440         return err;
441 }
442
443 postcore_initcall(of_bus_driver_init);
444
445 static int __init of_debug(char *str)
446 {
447         int val = 0;
448
449         get_option(&str, &val);
450         if (val & 1)
451                 of_resource_verbose = 1;
452         return 1;
453 }
454
455 __setup("of_debug=", of_debug);