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26#include <linux/kernel.h>
27#include <linux/dma-mapping.h>
28#include <linux/of.h>
29#include <asm/rheap.h>
30#include <asm/ppc4xx_ocm.h>
31#include <linux/slab.h>
32#include <linux/debugfs.h>
33
34#define OCM_DISABLED 0
35#define OCM_ENABLED 1
36
37struct ocm_block {
38 struct list_head list;
39 void __iomem *addr;
40 int size;
41 const char *owner;
42};
43
44
45struct ocm_region {
46 phys_addr_t phys;
47 void __iomem *virt;
48
49 int memtotal;
50 int memfree;
51
52 rh_info_t *rh;
53 struct list_head list;
54};
55
56struct ocm_info {
57 int index;
58 int status;
59 int ready;
60
61 phys_addr_t phys;
62
63 int alignment;
64 int memtotal;
65 int cache_size;
66
67 struct ocm_region nc;
68 struct ocm_region c;
69};
70
71static struct ocm_info *ocm_nodes;
72static int ocm_count;
73
74static struct ocm_info *ocm_get_node(unsigned int index)
75{
76 if (index >= ocm_count) {
77 printk(KERN_ERR "PPC4XX OCM: invalid index");
78 return NULL;
79 }
80
81 return &ocm_nodes[index];
82}
83
84static int ocm_free_region(struct ocm_region *ocm_reg, const void *addr)
85{
86 struct ocm_block *blk, *tmp;
87 unsigned long offset;
88
89 if (!ocm_reg->virt)
90 return 0;
91
92 list_for_each_entry_safe(blk, tmp, &ocm_reg->list, list) {
93 if (blk->addr == addr) {
94 offset = addr - ocm_reg->virt;
95 ocm_reg->memfree += blk->size;
96 rh_free(ocm_reg->rh, offset);
97 list_del(&blk->list);
98 kfree(blk);
99 return 1;
100 }
101 }
102
103 return 0;
104}
105
106static void __init ocm_init_node(int count, struct device_node *node)
107{
108 struct ocm_info *ocm;
109
110 const unsigned int *cell_index;
111 const unsigned int *cache_size;
112 int len;
113
114 struct resource rsrc;
115 int ioflags;
116
117 ocm = ocm_get_node(count);
118
119 cell_index = of_get_property(node, "cell-index", &len);
120 if (!cell_index) {
121 printk(KERN_ERR "PPC4XX OCM: missing cell-index property");
122 return;
123 }
124 ocm->index = *cell_index;
125
126 if (of_device_is_available(node))
127 ocm->status = OCM_ENABLED;
128
129 cache_size = of_get_property(node, "cached-region-size", &len);
130 if (cache_size)
131 ocm->cache_size = *cache_size;
132
133 if (of_address_to_resource(node, 0, &rsrc)) {
134 printk(KERN_ERR "PPC4XX OCM%d: could not get resource address\n",
135 ocm->index);
136 return;
137 }
138
139 ocm->phys = rsrc.start;
140 ocm->memtotal = (rsrc.end - rsrc.start + 1);
141
142 printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (%s)\n",
143 ocm->index, ocm->memtotal,
144 (ocm->status == OCM_DISABLED) ? "disabled" : "enabled");
145
146 if (ocm->status == OCM_DISABLED)
147 return;
148
149
150
151 if (!request_mem_region(ocm->phys, ocm->memtotal, "ppc4xx_ocm")) {
152 printk(KERN_ERR "PPC4XX OCM%d: could not request region\n",
153 ocm->index);
154 return;
155 }
156
157
158
159 ocm->nc.phys = ocm->phys;
160 ocm->nc.memtotal = ocm->memtotal - ocm->cache_size;
161 ocm->nc.memfree = ocm->nc.memtotal;
162
163 ocm->c.phys = ocm->phys + ocm->nc.memtotal;
164 ocm->c.memtotal = ocm->cache_size;
165 ocm->c.memfree = ocm->c.memtotal;
166
167 if (ocm->nc.memtotal == 0)
168 ocm->nc.phys = 0;
169
170 if (ocm->c.memtotal == 0)
171 ocm->c.phys = 0;
172
173 printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (non-cached)\n",
174 ocm->index, ocm->nc.memtotal);
175
176 printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (cached)\n",
177 ocm->index, ocm->c.memtotal);
178
179
180 if (ocm->nc.memtotal) {
181 ioflags = _PAGE_NO_CACHE | _PAGE_GUARDED | _PAGE_EXEC;
182 ocm->nc.virt = __ioremap(ocm->nc.phys, ocm->nc.memtotal,
183 ioflags);
184
185 if (!ocm->nc.virt) {
186 printk(KERN_ERR
187 "PPC4XX OCM%d: failed to ioremap non-cached memory\n",
188 ocm->index);
189 ocm->nc.memfree = 0;
190 return;
191 }
192 }
193
194
195
196 if (ocm->c.memtotal) {
197 ioflags = _PAGE_EXEC;
198 ocm->c.virt = __ioremap(ocm->c.phys, ocm->c.memtotal,
199 ioflags);
200
201 if (!ocm->c.virt) {
202 printk(KERN_ERR
203 "PPC4XX OCM%d: failed to ioremap cached memory\n",
204 ocm->index);
205 ocm->c.memfree = 0;
206 return;
207 }
208 }
209
210
211
212 ocm->alignment = 4;
213
214 if (ocm->nc.virt) {
215 ocm->nc.rh = rh_create(ocm->alignment);
216 rh_attach_region(ocm->nc.rh, 0, ocm->nc.memtotal);
217 }
218
219 if (ocm->c.virt) {
220 ocm->c.rh = rh_create(ocm->alignment);
221 rh_attach_region(ocm->c.rh, 0, ocm->c.memtotal);
222 }
223
224 INIT_LIST_HEAD(&ocm->nc.list);
225 INIT_LIST_HEAD(&ocm->c.list);
226
227 ocm->ready = 1;
228
229 return;
230}
231
232static int ocm_debugfs_show(struct seq_file *m, void *v)
233{
234 struct ocm_block *blk, *tmp;
235 unsigned int i;
236
237 for (i = 0; i < ocm_count; i++) {
238 struct ocm_info *ocm = ocm_get_node(i);
239
240 if (!ocm || !ocm->ready)
241 continue;
242
243 seq_printf(m, "PPC4XX OCM : %d\n", ocm->index);
244 seq_printf(m, "PhysAddr : 0x%llx\n", ocm->phys);
245 seq_printf(m, "MemTotal : %d Bytes\n", ocm->memtotal);
246 seq_printf(m, "MemTotal(NC) : %d Bytes\n", ocm->nc.memtotal);
247 seq_printf(m, "MemTotal(C) : %d Bytes\n", ocm->c.memtotal);
248
249 seq_printf(m, "\n");
250
251 seq_printf(m, "NC.PhysAddr : 0x%llx\n", ocm->nc.phys);
252 seq_printf(m, "NC.VirtAddr : 0x%p\n", ocm->nc.virt);
253 seq_printf(m, "NC.MemTotal : %d Bytes\n", ocm->nc.memtotal);
254 seq_printf(m, "NC.MemFree : %d Bytes\n", ocm->nc.memfree);
255
256 list_for_each_entry_safe(blk, tmp, &ocm->nc.list, list) {
257 seq_printf(m, "NC.MemUsed : %d Bytes (%s)\n",
258 blk->size, blk->owner);
259 }
260
261 seq_printf(m, "\n");
262
263 seq_printf(m, "C.PhysAddr : 0x%llx\n", ocm->c.phys);
264 seq_printf(m, "C.VirtAddr : 0x%p\n", ocm->c.virt);
265 seq_printf(m, "C.MemTotal : %d Bytes\n", ocm->c.memtotal);
266 seq_printf(m, "C.MemFree : %d Bytes\n", ocm->c.memfree);
267
268 list_for_each_entry_safe(blk, tmp, &ocm->c.list, list) {
269 seq_printf(m, "C.MemUsed : %d Bytes (%s)\n",
270 blk->size, blk->owner);
271 }
272
273 seq_printf(m, "\n");
274 }
275
276 return 0;
277}
278
279static int ocm_debugfs_open(struct inode *inode, struct file *file)
280{
281 return single_open(file, ocm_debugfs_show, NULL);
282}
283
284static const struct file_operations ocm_debugfs_fops = {
285 .open = ocm_debugfs_open,
286 .read = seq_read,
287 .llseek = seq_lseek,
288 .release = single_release,
289};
290
291static int ocm_debugfs_init(void)
292{
293 struct dentry *junk;
294
295 junk = debugfs_create_dir("ppc4xx_ocm", 0);
296 if (!junk) {
297 printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create dir\n");
298 return -1;
299 }
300
301 if (debugfs_create_file("info", 0644, junk, NULL, &ocm_debugfs_fops)) {
302 printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create file\n");
303 return -1;
304 }
305
306 return 0;
307}
308
309void *ppc4xx_ocm_alloc(phys_addr_t *phys, int size, int align,
310 int flags, const char *owner)
311{
312 void __iomem *addr = NULL;
313 unsigned long offset;
314 struct ocm_info *ocm;
315 struct ocm_region *ocm_reg;
316 struct ocm_block *ocm_blk;
317 int i;
318
319 for (i = 0; i < ocm_count; i++) {
320 ocm = ocm_get_node(i);
321
322 if (!ocm || !ocm->ready)
323 continue;
324
325 if (flags == PPC4XX_OCM_NON_CACHED)
326 ocm_reg = &ocm->nc;
327 else
328 ocm_reg = &ocm->c;
329
330 if (!ocm_reg->virt)
331 continue;
332
333 if (align < ocm->alignment)
334 align = ocm->alignment;
335
336 offset = rh_alloc_align(ocm_reg->rh, size, align, NULL);
337
338 if (IS_ERR_VALUE(offset))
339 continue;
340
341 ocm_blk = kzalloc(sizeof(struct ocm_block *), GFP_KERNEL);
342 if (!ocm_blk) {
343 printk(KERN_ERR "PPC4XX OCM: could not allocate ocm block");
344 rh_free(ocm_reg->rh, offset);
345 break;
346 }
347
348 *phys = ocm_reg->phys + offset;
349 addr = ocm_reg->virt + offset;
350 size = ALIGN(size, align);
351
352 ocm_blk->addr = addr;
353 ocm_blk->size = size;
354 ocm_blk->owner = owner;
355 list_add_tail(&ocm_blk->list, &ocm_reg->list);
356
357 ocm_reg->memfree -= size;
358
359 break;
360 }
361
362 return addr;
363}
364
365void ppc4xx_ocm_free(const void *addr)
366{
367 int i;
368
369 if (!addr)
370 return;
371
372 for (i = 0; i < ocm_count; i++) {
373 struct ocm_info *ocm = ocm_get_node(i);
374
375 if (!ocm || !ocm->ready)
376 continue;
377
378 if (ocm_free_region(&ocm->nc, addr) ||
379 ocm_free_region(&ocm->c, addr))
380 return;
381 }
382}
383
384static int __init ppc4xx_ocm_init(void)
385{
386 struct device_node *np;
387 int count;
388
389 count = 0;
390 for_each_compatible_node(np, NULL, "ibm,ocm")
391 count++;
392
393 if (!count)
394 return 0;
395
396 ocm_nodes = kzalloc((count * sizeof(struct ocm_info)), GFP_KERNEL);
397 if (!ocm_nodes) {
398 printk(KERN_ERR "PPC4XX OCM: failed to allocate OCM nodes!\n");
399 return -ENOMEM;
400 }
401
402 ocm_count = count;
403 count = 0;
404
405 for_each_compatible_node(np, NULL, "ibm,ocm") {
406 ocm_init_node(count, np);
407 count++;
408 }
409
410 ocm_debugfs_init();
411
412 return 0;
413}
414
415arch_initcall(ppc4xx_ocm_init);
416
