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c19d8248 VNHT |
1 | /* |
2 | * PowerPC 4xx OCM memory allocation support | |
3 | * | |
4 | * (C) Copyright 2009, Applied Micro Circuits Corporation | |
5 | * Victor Gallardo (vgallardo@amcc.com) | |
6 | * | |
7 | * See file CREDITS for list of people who contributed to this | |
8 | * project. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation; either version 2 of | |
13 | * the License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
23 | * MA 02111-1307 USA | |
24 | */ | |
25 | ||
26 | #include <linux/kernel.h> | |
27 | #include <linux/dma-mapping.h> | |
28 | #include <linux/of.h> | |
c11eede6 | 29 | #include <linux/of_address.h> |
c19d8248 VNHT |
30 | #include <asm/rheap.h> |
31 | #include <asm/ppc4xx_ocm.h> | |
32 | #include <linux/slab.h> | |
33 | #include <linux/debugfs.h> | |
34 | ||
35 | #define OCM_DISABLED 0 | |
36 | #define OCM_ENABLED 1 | |
37 | ||
38 | struct ocm_block { | |
39 | struct list_head list; | |
40 | void __iomem *addr; | |
41 | int size; | |
42 | const char *owner; | |
43 | }; | |
44 | ||
45 | /* non-cached or cached region */ | |
46 | struct ocm_region { | |
47 | phys_addr_t phys; | |
48 | void __iomem *virt; | |
49 | ||
50 | int memtotal; | |
51 | int memfree; | |
52 | ||
53 | rh_info_t *rh; | |
54 | struct list_head list; | |
55 | }; | |
56 | ||
57 | struct ocm_info { | |
58 | int index; | |
59 | int status; | |
60 | int ready; | |
61 | ||
62 | phys_addr_t phys; | |
63 | ||
64 | int alignment; | |
65 | int memtotal; | |
66 | int cache_size; | |
67 | ||
68 | struct ocm_region nc; /* non-cached region */ | |
69 | struct ocm_region c; /* cached region */ | |
70 | }; | |
71 | ||
72 | static struct ocm_info *ocm_nodes; | |
73 | static int ocm_count; | |
74 | ||
75 | static struct ocm_info *ocm_get_node(unsigned int index) | |
76 | { | |
77 | if (index >= ocm_count) { | |
78 | printk(KERN_ERR "PPC4XX OCM: invalid index"); | |
79 | return NULL; | |
80 | } | |
81 | ||
82 | return &ocm_nodes[index]; | |
83 | } | |
84 | ||
85 | static int ocm_free_region(struct ocm_region *ocm_reg, const void *addr) | |
86 | { | |
87 | struct ocm_block *blk, *tmp; | |
88 | unsigned long offset; | |
89 | ||
90 | if (!ocm_reg->virt) | |
91 | return 0; | |
92 | ||
93 | list_for_each_entry_safe(blk, tmp, &ocm_reg->list, list) { | |
94 | if (blk->addr == addr) { | |
95 | offset = addr - ocm_reg->virt; | |
96 | ocm_reg->memfree += blk->size; | |
97 | rh_free(ocm_reg->rh, offset); | |
98 | list_del(&blk->list); | |
99 | kfree(blk); | |
100 | return 1; | |
101 | } | |
102 | } | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | static void __init ocm_init_node(int count, struct device_node *node) | |
108 | { | |
109 | struct ocm_info *ocm; | |
110 | ||
111 | const unsigned int *cell_index; | |
112 | const unsigned int *cache_size; | |
113 | int len; | |
114 | ||
115 | struct resource rsrc; | |
116 | int ioflags; | |
117 | ||
118 | ocm = ocm_get_node(count); | |
119 | ||
120 | cell_index = of_get_property(node, "cell-index", &len); | |
121 | if (!cell_index) { | |
122 | printk(KERN_ERR "PPC4XX OCM: missing cell-index property"); | |
123 | return; | |
124 | } | |
125 | ocm->index = *cell_index; | |
126 | ||
127 | if (of_device_is_available(node)) | |
128 | ocm->status = OCM_ENABLED; | |
129 | ||
130 | cache_size = of_get_property(node, "cached-region-size", &len); | |
131 | if (cache_size) | |
132 | ocm->cache_size = *cache_size; | |
133 | ||
134 | if (of_address_to_resource(node, 0, &rsrc)) { | |
135 | printk(KERN_ERR "PPC4XX OCM%d: could not get resource address\n", | |
136 | ocm->index); | |
137 | return; | |
138 | } | |
139 | ||
140 | ocm->phys = rsrc.start; | |
141 | ocm->memtotal = (rsrc.end - rsrc.start + 1); | |
142 | ||
143 | printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (%s)\n", | |
144 | ocm->index, ocm->memtotal, | |
145 | (ocm->status == OCM_DISABLED) ? "disabled" : "enabled"); | |
146 | ||
147 | if (ocm->status == OCM_DISABLED) | |
148 | return; | |
149 | ||
150 | /* request region */ | |
151 | ||
152 | if (!request_mem_region(ocm->phys, ocm->memtotal, "ppc4xx_ocm")) { | |
153 | printk(KERN_ERR "PPC4XX OCM%d: could not request region\n", | |
154 | ocm->index); | |
155 | return; | |
156 | } | |
157 | ||
158 | /* Configure non-cached and cached regions */ | |
159 | ||
160 | ocm->nc.phys = ocm->phys; | |
161 | ocm->nc.memtotal = ocm->memtotal - ocm->cache_size; | |
162 | ocm->nc.memfree = ocm->nc.memtotal; | |
163 | ||
164 | ocm->c.phys = ocm->phys + ocm->nc.memtotal; | |
165 | ocm->c.memtotal = ocm->cache_size; | |
166 | ocm->c.memfree = ocm->c.memtotal; | |
167 | ||
168 | if (ocm->nc.memtotal == 0) | |
169 | ocm->nc.phys = 0; | |
170 | ||
171 | if (ocm->c.memtotal == 0) | |
172 | ocm->c.phys = 0; | |
173 | ||
174 | printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (non-cached)\n", | |
175 | ocm->index, ocm->nc.memtotal); | |
176 | ||
177 | printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (cached)\n", | |
178 | ocm->index, ocm->c.memtotal); | |
179 | ||
180 | /* ioremap the non-cached region */ | |
181 | if (ocm->nc.memtotal) { | |
182 | ioflags = _PAGE_NO_CACHE | _PAGE_GUARDED | _PAGE_EXEC; | |
183 | ocm->nc.virt = __ioremap(ocm->nc.phys, ocm->nc.memtotal, | |
184 | ioflags); | |
185 | ||
186 | if (!ocm->nc.virt) { | |
187 | printk(KERN_ERR | |
188 | "PPC4XX OCM%d: failed to ioremap non-cached memory\n", | |
189 | ocm->index); | |
190 | ocm->nc.memfree = 0; | |
191 | return; | |
192 | } | |
193 | } | |
194 | ||
195 | /* ioremap the cached region */ | |
196 | ||
197 | if (ocm->c.memtotal) { | |
198 | ioflags = _PAGE_EXEC; | |
199 | ocm->c.virt = __ioremap(ocm->c.phys, ocm->c.memtotal, | |
200 | ioflags); | |
201 | ||
202 | if (!ocm->c.virt) { | |
203 | printk(KERN_ERR | |
204 | "PPC4XX OCM%d: failed to ioremap cached memory\n", | |
205 | ocm->index); | |
206 | ocm->c.memfree = 0; | |
207 | return; | |
208 | } | |
209 | } | |
210 | ||
211 | /* Create Remote Heaps */ | |
212 | ||
213 | ocm->alignment = 4; /* default 4 byte alignment */ | |
214 | ||
215 | if (ocm->nc.virt) { | |
216 | ocm->nc.rh = rh_create(ocm->alignment); | |
217 | rh_attach_region(ocm->nc.rh, 0, ocm->nc.memtotal); | |
218 | } | |
219 | ||
220 | if (ocm->c.virt) { | |
221 | ocm->c.rh = rh_create(ocm->alignment); | |
222 | rh_attach_region(ocm->c.rh, 0, ocm->c.memtotal); | |
223 | } | |
224 | ||
225 | INIT_LIST_HEAD(&ocm->nc.list); | |
226 | INIT_LIST_HEAD(&ocm->c.list); | |
227 | ||
228 | ocm->ready = 1; | |
229 | ||
230 | return; | |
231 | } | |
232 | ||
233 | static int ocm_debugfs_show(struct seq_file *m, void *v) | |
234 | { | |
235 | struct ocm_block *blk, *tmp; | |
236 | unsigned int i; | |
237 | ||
238 | for (i = 0; i < ocm_count; i++) { | |
239 | struct ocm_info *ocm = ocm_get_node(i); | |
240 | ||
241 | if (!ocm || !ocm->ready) | |
242 | continue; | |
243 | ||
244 | seq_printf(m, "PPC4XX OCM : %d\n", ocm->index); | |
245 | seq_printf(m, "PhysAddr : 0x%llx\n", ocm->phys); | |
246 | seq_printf(m, "MemTotal : %d Bytes\n", ocm->memtotal); | |
247 | seq_printf(m, "MemTotal(NC) : %d Bytes\n", ocm->nc.memtotal); | |
248 | seq_printf(m, "MemTotal(C) : %d Bytes\n", ocm->c.memtotal); | |
249 | ||
250 | seq_printf(m, "\n"); | |
251 | ||
252 | seq_printf(m, "NC.PhysAddr : 0x%llx\n", ocm->nc.phys); | |
253 | seq_printf(m, "NC.VirtAddr : 0x%p\n", ocm->nc.virt); | |
254 | seq_printf(m, "NC.MemTotal : %d Bytes\n", ocm->nc.memtotal); | |
255 | seq_printf(m, "NC.MemFree : %d Bytes\n", ocm->nc.memfree); | |
256 | ||
257 | list_for_each_entry_safe(blk, tmp, &ocm->nc.list, list) { | |
258 | seq_printf(m, "NC.MemUsed : %d Bytes (%s)\n", | |
259 | blk->size, blk->owner); | |
260 | } | |
261 | ||
262 | seq_printf(m, "\n"); | |
263 | ||
264 | seq_printf(m, "C.PhysAddr : 0x%llx\n", ocm->c.phys); | |
265 | seq_printf(m, "C.VirtAddr : 0x%p\n", ocm->c.virt); | |
266 | seq_printf(m, "C.MemTotal : %d Bytes\n", ocm->c.memtotal); | |
267 | seq_printf(m, "C.MemFree : %d Bytes\n", ocm->c.memfree); | |
268 | ||
269 | list_for_each_entry_safe(blk, tmp, &ocm->c.list, list) { | |
270 | seq_printf(m, "C.MemUsed : %d Bytes (%s)\n", | |
271 | blk->size, blk->owner); | |
272 | } | |
273 | ||
274 | seq_printf(m, "\n"); | |
275 | } | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static int ocm_debugfs_open(struct inode *inode, struct file *file) | |
281 | { | |
282 | return single_open(file, ocm_debugfs_show, NULL); | |
283 | } | |
284 | ||
285 | static const struct file_operations ocm_debugfs_fops = { | |
286 | .open = ocm_debugfs_open, | |
287 | .read = seq_read, | |
288 | .llseek = seq_lseek, | |
289 | .release = single_release, | |
290 | }; | |
291 | ||
292 | static int ocm_debugfs_init(void) | |
293 | { | |
294 | struct dentry *junk; | |
295 | ||
296 | junk = debugfs_create_dir("ppc4xx_ocm", 0); | |
297 | if (!junk) { | |
298 | printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create dir\n"); | |
299 | return -1; | |
300 | } | |
301 | ||
302 | if (debugfs_create_file("info", 0644, junk, NULL, &ocm_debugfs_fops)) { | |
303 | printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create file\n"); | |
304 | return -1; | |
305 | } | |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | void *ppc4xx_ocm_alloc(phys_addr_t *phys, int size, int align, | |
311 | int flags, const char *owner) | |
312 | { | |
313 | void __iomem *addr = NULL; | |
314 | unsigned long offset; | |
315 | struct ocm_info *ocm; | |
316 | struct ocm_region *ocm_reg; | |
317 | struct ocm_block *ocm_blk; | |
318 | int i; | |
319 | ||
320 | for (i = 0; i < ocm_count; i++) { | |
321 | ocm = ocm_get_node(i); | |
322 | ||
323 | if (!ocm || !ocm->ready) | |
324 | continue; | |
325 | ||
326 | if (flags == PPC4XX_OCM_NON_CACHED) | |
327 | ocm_reg = &ocm->nc; | |
328 | else | |
329 | ocm_reg = &ocm->c; | |
330 | ||
331 | if (!ocm_reg->virt) | |
332 | continue; | |
333 | ||
334 | if (align < ocm->alignment) | |
335 | align = ocm->alignment; | |
336 | ||
337 | offset = rh_alloc_align(ocm_reg->rh, size, align, NULL); | |
338 | ||
339 | if (IS_ERR_VALUE(offset)) | |
340 | continue; | |
341 | ||
1b429835 | 342 | ocm_blk = kzalloc(sizeof(struct ocm_block), GFP_KERNEL); |
c19d8248 VNHT |
343 | if (!ocm_blk) { |
344 | printk(KERN_ERR "PPC4XX OCM: could not allocate ocm block"); | |
345 | rh_free(ocm_reg->rh, offset); | |
346 | break; | |
347 | } | |
348 | ||
349 | *phys = ocm_reg->phys + offset; | |
350 | addr = ocm_reg->virt + offset; | |
351 | size = ALIGN(size, align); | |
352 | ||
353 | ocm_blk->addr = addr; | |
354 | ocm_blk->size = size; | |
355 | ocm_blk->owner = owner; | |
356 | list_add_tail(&ocm_blk->list, &ocm_reg->list); | |
357 | ||
358 | ocm_reg->memfree -= size; | |
359 | ||
360 | break; | |
361 | } | |
362 | ||
363 | return addr; | |
364 | } | |
365 | ||
366 | void ppc4xx_ocm_free(const void *addr) | |
367 | { | |
368 | int i; | |
369 | ||
370 | if (!addr) | |
371 | return; | |
372 | ||
373 | for (i = 0; i < ocm_count; i++) { | |
374 | struct ocm_info *ocm = ocm_get_node(i); | |
375 | ||
376 | if (!ocm || !ocm->ready) | |
377 | continue; | |
378 | ||
379 | if (ocm_free_region(&ocm->nc, addr) || | |
380 | ocm_free_region(&ocm->c, addr)) | |
381 | return; | |
382 | } | |
383 | } | |
384 | ||
385 | static int __init ppc4xx_ocm_init(void) | |
386 | { | |
387 | struct device_node *np; | |
388 | int count; | |
389 | ||
390 | count = 0; | |
391 | for_each_compatible_node(np, NULL, "ibm,ocm") | |
392 | count++; | |
393 | ||
394 | if (!count) | |
395 | return 0; | |
396 | ||
397 | ocm_nodes = kzalloc((count * sizeof(struct ocm_info)), GFP_KERNEL); | |
398 | if (!ocm_nodes) { | |
399 | printk(KERN_ERR "PPC4XX OCM: failed to allocate OCM nodes!\n"); | |
400 | return -ENOMEM; | |
401 | } | |
402 | ||
403 | ocm_count = count; | |
404 | count = 0; | |
405 | ||
406 | for_each_compatible_node(np, NULL, "ibm,ocm") { | |
407 | ocm_init_node(count, np); | |
408 | count++; | |
409 | } | |
410 | ||
411 | ocm_debugfs_init(); | |
412 | ||
413 | return 0; | |
414 | } | |
415 | ||
416 | arch_initcall(ppc4xx_ocm_init); |