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