1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/string.h>
3 #include <linux/kernel.h>
4 #include <linux/of.h>
5 #include <linux/init.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_platform.h>
11 #include <linux/platform_device.h>
12 #include <linux/dma-mapping.h>
13 #include <asm/leon.h>
14 #include <asm/leon_amba.h>
15
16 #include "of_device_common.h"
17 #include "irq.h"
18
19 /*
20 * PCI bus specific translator
21 */
22
23 static int of_bus_pci_match(struct device_node *np)
24 {
25 if (of_node_is_type(np, "pci") || of_node_is_type(np, "pciex")) {
26 /* Do not do PCI specific frobbing if the
27 * PCI bridge lacks a ranges property. We
28 * want to pass it through up to the next
29 * parent as-is, not with the PCI translate
30 * method which chops off the top address cell.
31 */
32 if (!of_property_present(np, "ranges"))
33 return 0;
34
35 return 1;
36 }
37
38 return 0;
39 }
40
41 static void of_bus_pci_count_cells(struct device_node *np,
42 int *addrc, int *sizec)
43 {
44 if (addrc)
45 *addrc = 3;
46 if (sizec)
47 *sizec = 2;
48 }
49
50 static int of_bus_pci_map(u32 *addr, const u32 *range,
51 int na, int ns, int pna)
52 {
53 u32 result[OF_MAX_ADDR_CELLS];
54 int i;
55
56 /* Check address type match */
57 if ((addr[0] ^ range[0]) & 0x03000000)
58 return -EINVAL;
59
60 if (of_out_of_range(addr + 1, range + 1, range + na + pna,
61 na - 1, ns))
62 return -EINVAL;
63
64 /* Start with the parent range base. */
65 memcpy(result, range + na, pna * 4);
66
67 /* Add in the child address offset, skipping high cell. */
68 for (i = 0; i < na - 1; i++)
69 result[pna - 1 - i] +=
70 (addr[na - 1 - i] -
71 range[na - 1 - i]);
72
73 memcpy(addr, result, pna * 4);
74
75 return 0;
76 }
77
78 static unsigned long of_bus_pci_get_flags(const u32 *addr, unsigned long flags)
79 {
80 u32 w = addr[0];
81
82 /* For PCI, we override whatever child busses may have used. */
83 flags = 0;
84 switch((w >> 24) & 0x03) {
85 case 0x01:
86 flags |= IORESOURCE_IO;
87 break;
88
89 case 0x02: /* 32 bits */
90 case 0x03: /* 64 bits */
91 flags |= IORESOURCE_MEM;
92 break;
93 }
94 if (w & 0x40000000)
95 flags |= IORESOURCE_PREFETCH;
96 return flags;
97 }
98
99 static unsigned long of_bus_sbus_get_flags(const u32 *addr, unsigned long flags)
100 {
101 return IORESOURCE_MEM;
102 }
103
104 /*
105 * AMBAPP bus specific translator
106 */
107
108 static int of_bus_ambapp_match(struct device_node *np)
109 {
110 return of_node_is_type(np, "ambapp");
111 }
112
113 static void of_bus_ambapp_count_cells(struct device_node *child,
114 int *addrc, int *sizec)
115 {
116 if (addrc)
117 *addrc = 1;
118 if (sizec)
119 *sizec = 1;
120 }
121
122 static int of_bus_ambapp_map(u32 *addr, const u32 *range,
123 int na, int ns, int pna)
124 {
125 return of_bus_default_map(addr, range, na, ns, pna);
126 }
127
128 static unsigned long of_bus_ambapp_get_flags(const u32 *addr,
129 unsigned long flags)
130 {
131 return IORESOURCE_MEM;
132 }
133
134 /*
135 * Array of bus specific translators
136 */
137
138 static struct of_bus of_busses[] = {
139 /* PCI */
140 {
141 .name = "pci",
142 .addr_prop_name = "assigned-addresses",
143 .match = of_bus_pci_match,
144 .count_cells = of_bus_pci_count_cells,
145 .map = of_bus_pci_map,
146 .get_flags = of_bus_pci_get_flags,
147 },
148 /* SBUS */
149 {
150 .name = "sbus",
151 .addr_prop_name = "reg",
152 .match = of_bus_sbus_match,
153 .count_cells = of_bus_sbus_count_cells,
154 .map = of_bus_default_map,
155 .get_flags = of_bus_sbus_get_flags,
156 },
157 /* AMBA */
158 {
159 .name = "ambapp",
160 .addr_prop_name = "reg",
161 .match = of_bus_ambapp_match,
162 .count_cells = of_bus_ambapp_count_cells,
163 .map = of_bus_ambapp_map,
164 .get_flags = of_bus_ambapp_get_flags,
165 },
166 /* Default */
167 {
168 .name = "default",
169 .addr_prop_name = "reg",
170 .match = NULL,
171 .count_cells = of_bus_default_count_cells,
172 .map = of_bus_default_map,
173 .get_flags = of_bus_default_get_flags,
174 },
175 };
176
177 static struct of_bus *of_match_bus(struct device_node *np)
178 {
179 int i;
180
181 for (i = 0; i < ARRAY_SIZE(of_busses); i ++)
182 if (!of_busses[i].match || of_busses[i].match(np))
183 return &of_busses[i];
184 BUG();
185 return NULL;
186 }
187
188 static int __init build_one_resource(struct device_node *parent,
189 struct of_bus *bus,
190 struct of_bus *pbus,
191 u32 *addr,
192 int na, int ns, int pna)
193 {
194 const u32 *ranges;
195 unsigned int rlen;
196 int rone;
197
198 ranges = of_get_property(parent, "ranges", &rlen);
199 if (ranges == NULL || rlen == 0) {
200 u32 result[OF_MAX_ADDR_CELLS];
201 int i;
202
203 memset(result, 0, pna * 4);
204 for (i = 0; i < na; i++)
205 result[pna - 1 - i] =
206 addr[na - 1 - i];
207
208 memcpy(addr, result, pna * 4);
209 return 0;
210 }
211
212 /* Now walk through the ranges */
213 rlen /= 4;
214 rone = na + pna + ns;
215 for (; rlen >= rone; rlen -= rone, ranges += rone) {
216 if (!bus->map(addr, ranges, na, ns, pna))
217 return 0;
218 }
219
220 return 1;
221 }
222
223 static int __init use_1to1_mapping(struct device_node *pp)
224 {
225 /* If we have a ranges property in the parent, use it. */
226 if (of_property_present(pp, "ranges"))
227 return 0;
228
229 /* Some SBUS devices use intermediate nodes to express
230 * hierarchy within the device itself. These aren't
231 * real bus nodes, and don't have a 'ranges' property.
232 * But, we should still pass the translation work up
233 * to the SBUS itself.
234 */
235 if (of_node_name_eq(pp, "dma") ||
236 of_node_name_eq(pp, "espdma") ||
237 of_node_name_eq(pp, "ledma") ||
238 of_node_name_eq(pp, "lebuffer"))
239 return 0;
240
241 return 1;
242 }
243
244 static int of_resource_verbose;
245
246 static void __init build_device_resources(struct platform_device *op,
247 struct device *parent)
248 {
249 struct platform_device *p_op;
250 struct of_bus *bus;
251 int na, ns;
252 int index, num_reg;
253 const void *preg;
254
255 if (!parent)
256 return;
257
258 p_op = to_platform_device(parent);
259 bus = of_match_bus(p_op->dev.of_node);
260 bus->count_cells(op->dev.of_node, &na, &ns);
261
262 preg = of_get_property(op->dev.of_node, bus->addr_prop_name, &num_reg);
263 if (!preg || num_reg == 0)
264 return;
265
266 /* Convert to num-cells. */
267 num_reg /= 4;
268
269 /* Conver to num-entries. */
270 num_reg /= na + ns;
271
272 op->resource = op->archdata.resource;
273 op->num_resources = num_reg;
274 for (index = 0; index < num_reg; index++) {
275 struct resource *r = &op->resource[index];
276 u32 addr[OF_MAX_ADDR_CELLS];
277 const u32 *reg = (preg + (index * ((na + ns) * 4)));
278 struct device_node *dp = op->dev.of_node;
279 struct device_node *pp = p_op->dev.of_node;
280 struct of_bus *pbus, *dbus;
281 u64 size, result = OF_BAD_ADDR;
282 unsigned long flags;
283 int dna, dns;
284 int pna, pns;
285
286 size = of_read_addr(reg + na, ns);
287
288 memcpy(addr, reg, na * 4);
289
290 flags = bus->get_flags(reg, 0);
291
292 if (use_1to1_mapping(pp)) {
293 result = of_read_addr(addr, na);
294 goto build_res;
295 }
296
297 dna = na;
298 dns = ns;
299 dbus = bus;
300
301 while (1) {
302 dp = pp;
303 pp = dp->parent;
304 if (!pp) {
305 result = of_read_addr(addr, dna);
306 break;
307 }
308
309 pbus = of_match_bus(pp);
310 pbus->count_cells(dp, &pna, &pns);
311
312 if (build_one_resource(dp, dbus, pbus, addr,
313 dna, dns, pna))
314 break;
315
316 flags = pbus->get_flags(addr, flags);
317
318 dna = pna;
319 dns = pns;
320 dbus = pbus;
321 }
322
323 build_res:
324 memset(r, 0, sizeof(*r));
325
326 if (of_resource_verbose)
327 printk("%pOF reg[%d] -> %llx\n",
328 op->dev.of_node, index,
329 result);
330
331 if (result != OF_BAD_ADDR) {
332 r->start = result & 0xffffffff;
333 r->end = result + size - 1;
334 r->flags = flags | ((result >> 32ULL) & 0xffUL);
335 }
336 r->name = op->dev.of_node->full_name;
337 }
338 }
339
340 static struct platform_device * __init scan_one_device(struct device_node *dp,
341 struct device *parent)
342 {
343 struct platform_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
344 const struct linux_prom_irqs *intr;
345 struct dev_archdata *sd;
346 int len, i;
347
348 if (!op)
349 return NULL;
350
351 sd = &op->dev.archdata;
352 sd->op = op;
353
354 op->dev.of_node = dp;
355
356 intr = of_get_property(dp, "intr", &len);
357 if (intr) {
358 op->archdata.num_irqs = len / sizeof(struct linux_prom_irqs);
359 for (i = 0; i < op->archdata.num_irqs; i++)
360 op->archdata.irqs[i] =
361 sparc_config.build_device_irq(op, intr[i].pri);
362 } else {
363 const unsigned int *irq =
364 of_get_property(dp, "interrupts", &len);
365
366 if (irq) {
367 op->archdata.num_irqs = len / sizeof(unsigned int);
368 for (i = 0; i < op->archdata.num_irqs; i++)
369 op->archdata.irqs[i] =
370 sparc_config.build_device_irq(op, irq[i]);
371 } else {
372 op->archdata.num_irqs = 0;
373 }
374 }
375
376 build_device_resources(op, parent);
377
378 op->dev.parent = parent;
379 op->dev.bus = &platform_bus_type;
380 if (!parent)
381 dev_set_name(&op->dev, "root");
382 else
383 dev_set_name(&op->dev, "%08x", dp->phandle);
384
385 op->dev.coherent_dma_mask = DMA_BIT_MASK(32);
386 op->dev.dma_mask = &op->dev.coherent_dma_mask;
387
388 if (of_device_register(op)) {
389 printk("%pOF: Could not register of device.\n", dp);
390 kfree(op);
391 op = NULL;
392 }
393
394 return op;
395 }
396
397 static void __init scan_tree(struct device_node *dp, struct device *parent)
398 {
399 while (dp) {
400 struct platform_device *op = scan_one_device(dp, parent);
401
402 if (op)
403 scan_tree(dp->child, &op->dev);
404
405 dp = dp->sibling;
406 }
407 }
408
409 static int __init scan_of_devices(void)
410 {
411 struct device_node *root = of_find_node_by_path("/");
412 struct platform_device *parent;
413
414 parent = scan_one_device(root, NULL);
415 if (!parent)
416 return 0;
417
418 scan_tree(root->child, &parent->dev);
419 return 0;
420 }
421 postcore_initcall(scan_of_devices);
422
423 static int __init of_debug(char *str)
424 {
425 int val = 0;
426
427 get_option(&str, &val);
428 if (val & 1)
429 of_resource_verbose = 1;
430 return 1;
431 }
432
433 __setup("of_debug=", of_debug);
434
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