~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/powerpc/sysdev/ppc4xx_ocm.c

Version: ~ [ linux-5.4-rc7 ] ~ [ linux-5.3.11 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.84 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.154 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.201 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.201 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.77 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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>
 29 #include <linux/of_address.h>
 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 
342                 ocm_blk = kzalloc(sizeof(struct ocm_block), GFP_KERNEL);
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);
417 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp