arch/powerpc/platforms/4xx/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
 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         /* request region */
 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         /* Configure non-cached and cached regions */
 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         /* ioremap the non-cached region */
 180         if (ocm->nc.memtotal) {
 181                 ocm->nc.virt = __ioremap(ocm->nc.phys, ocm->nc.memtotal,
 182                         _PAGE_EXEC | pgprot_val(PAGE_KERNEL_NCG));
 183
 184                 if (!ocm->nc.virt) {
 185                         printk(KERN_ERR
 186                                "PPC4XX OCM%d: failed to ioremap non-cached memory\n",
 187                                ocm->index);
 188                         ocm->nc.memfree = 0;
 189                         return;
 190                 }
 191         }
 192
 193         /* ioremap the cached region */
 194
 195         if (ocm->c.memtotal) {
 196                 ocm->c.virt = __ioremap(ocm->c.phys, ocm->c.memtotal,
 197                                         _PAGE_EXEC | pgprot_val(PAGE_KERNEL));
 198
 199                 if (!ocm->c.virt) {
 200                         printk(KERN_ERR
 201                                "PPC4XX OCM%d: failed to ioremap cached memory\n",
 202                                ocm->index);
 203                         ocm->c.memfree = 0;
 204                         return;
 205                 }
 206         }
 207
 208         /* Create Remote Heaps */
 209
 210         ocm->alignment = 4; /* default 4 byte alignment */
 211
 212         if (ocm->nc.virt) {
 213                 ocm->nc.rh = rh_create(ocm->alignment);
 214                 rh_attach_region(ocm->nc.rh, 0, ocm->nc.memtotal);
 215         }
 216
 217         if (ocm->c.virt) {
 218                 ocm->c.rh = rh_create(ocm->alignment);
 219                 rh_attach_region(ocm->c.rh, 0, ocm->c.memtotal);
 220         }
 221
 222         INIT_LIST_HEAD(&ocm->nc.list);
 223         INIT_LIST_HEAD(&ocm->c.list);
 224
 225         ocm->ready = 1;
 226 }
 227
 228 static int ocm_debugfs_show(struct seq_file *m, void *v)
 229 {
 230         struct ocm_block *blk, *tmp;
 231         unsigned int i;
 232
 233         for (i = 0; i < ocm_count; i++) {
 234                 struct ocm_info *ocm = ocm_get_node(i);
 235
 236                 if (!ocm || !ocm->ready)
 237                         continue;
 238
 239                 seq_printf(m, "PPC4XX OCM   : %d\n", ocm->index);
 240                 seq_printf(m, "PhysAddr     : %pa\n", &(ocm->phys));
 241                 seq_printf(m, "MemTotal     : %d Bytes\n", ocm->memtotal);
 242                 seq_printf(m, "MemTotal(NC) : %d Bytes\n", ocm->nc.memtotal);
 243                 seq_printf(m, "MemTotal(C)  : %d Bytes\n\n", ocm->c.memtotal);
 244
 245                 seq_printf(m, "NC.PhysAddr  : %pa\n", &(ocm->nc.phys));
 246                 seq_printf(m, "NC.VirtAddr  : 0x%p\n", ocm->nc.virt);
 247                 seq_printf(m, "NC.MemTotal  : %d Bytes\n", ocm->nc.memtotal);
 248                 seq_printf(m, "NC.MemFree   : %d Bytes\n", ocm->nc.memfree);
 249
 250                 list_for_each_entry_safe(blk, tmp, &ocm->nc.list, list) {
 251                         seq_printf(m, "NC.MemUsed   : %d Bytes (%s)\n",
 252                                                         blk->size, blk->owner);
 253                 }
 254
 255                 seq_printf(m, "\nC.PhysAddr   : %pa\n", &(ocm->c.phys));
 256                 seq_printf(m, "C.VirtAddr   : 0x%p\n", ocm->c.virt);
 257                 seq_printf(m, "C.MemTotal   : %d Bytes\n", ocm->c.memtotal);
 258                 seq_printf(m, "C.MemFree    : %d Bytes\n", ocm->c.memfree);
 259
 260                 list_for_each_entry_safe(blk, tmp, &ocm->c.list, list) {
 261                         seq_printf(m, "C.MemUsed    : %d Bytes (%s)\n",
 262                                                 blk->size, blk->owner);
 263                 }
 264
 265                 seq_putc(m, '\n');
 266         }
 267
 268         return 0;
 269 }
 270
 271 static int ocm_debugfs_open(struct inode *inode, struct file *file)
 272 {
 273         return single_open(file, ocm_debugfs_show, NULL);
 274 }
 275
 276 static const struct file_operations ocm_debugfs_fops = {
 277         .open = ocm_debugfs_open,
 278         .read = seq_read,
 279         .llseek = seq_lseek,
 280         .release = single_release,
 281 };
 282
 283 static int ocm_debugfs_init(void)
 284 {
 285         struct dentry *junk;
 286
 287         junk = debugfs_create_dir("ppc4xx_ocm", 0);
 288         if (!junk) {
 289                 printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create dir\n");
 290                 return -1;
 291         }
 292
 293         if (debugfs_create_file("info", 0644, junk, NULL, &ocm_debugfs_fops)) {
 294                 printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create file\n");
 295                 return -1;
 296         }
 297
 298         return 0;
 299 }
 300
 301 void *ppc4xx_ocm_alloc(phys_addr_t *phys, int size, int align,
 302                         int flags, const char *owner)
 303 {
 304         void __iomem *addr = NULL;
 305         unsigned long offset;
 306         struct ocm_info *ocm;
 307         struct ocm_region *ocm_reg;
 308         struct ocm_block *ocm_blk;
 309         int i;
 310
 311         for (i = 0; i < ocm_count; i++) {
 312                 ocm = ocm_get_node(i);
 313
 314                 if (!ocm || !ocm->ready)
 315                         continue;
 316
 317                 if (flags == PPC4XX_OCM_NON_CACHED)
 318                         ocm_reg = &ocm->nc;
 319                 else
 320                         ocm_reg = &ocm->c;
 321
 322                 if (!ocm_reg->virt)
 323                         continue;
 324
 325                 if (align < ocm->alignment)
 326                         align = ocm->alignment;
 327
 328                 offset = rh_alloc_align(ocm_reg->rh, size, align, NULL);
 329
 330                 if (IS_ERR_VALUE(offset))
 331                         continue;
 332
 333                 ocm_blk = kzalloc(sizeof(*ocm_blk), GFP_KERNEL);
 334                 if (!ocm_blk) {
 335                         rh_free(ocm_reg->rh, offset);
 336                         break;
 337                 }
 338
 339                 *phys = ocm_reg->phys + offset;
 340                 addr = ocm_reg->virt + offset;
 341                 size = ALIGN(size, align);
 342
 343                 ocm_blk->addr = addr;
 344                 ocm_blk->size = size;
 345                 ocm_blk->owner = owner;
 346                 list_add_tail(&ocm_blk->list, &ocm_reg->list);
 347
 348                 ocm_reg->memfree -= size;
 349
 350                 break;
 351         }
 352
 353         return addr;
 354 }
 355
 356 void ppc4xx_ocm_free(const void *addr)
 357 {
 358         int i;
 359
 360         if (!addr)
 361                 return;
 362
 363         for (i = 0; i < ocm_count; i++) {
 364                 struct ocm_info *ocm = ocm_get_node(i);
 365
 366                 if (!ocm || !ocm->ready)
 367                         continue;
 368
 369                 if (ocm_free_region(&ocm->nc, addr) ||
 370                         ocm_free_region(&ocm->c, addr))
 371                         return;
 372         }
 373 }
 374
 375 static int __init ppc4xx_ocm_init(void)
 376 {
 377         struct device_node *np;
 378         int count;
 379
 380         count = 0;
 381         for_each_compatible_node(np, NULL, "ibm,ocm")
 382                 count++;
 383
 384         if (!count)
 385                 return 0;
 386
 387         ocm_nodes = kzalloc((count * sizeof(struct ocm_info)), GFP_KERNEL);
 388         if (!ocm_nodes)
 389                 return -ENOMEM;
 390
 391         ocm_count = count;
 392         count = 0;
 393
 394         for_each_compatible_node(np, NULL, "ibm,ocm") {
 395                 ocm_init_node(count, np);
 396                 count++;
 397         }
 398
 399         ocm_debugfs_init();
 400
 401         return 0;
 402 }
 403
 404 arch_initcall(ppc4xx_ocm_init);