arch/powerpc/sysdev/ppc4xx_ocm.c

   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);