arch/powerpc/platforms/ps3/system-bus.c

   1 /*
   2  *  PS3 system bus driver.
   3  *
   4  *  Copyright (C) 2006 Sony Computer Entertainment Inc.
   5  *  Copyright 2006 Sony Corp.
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; version 2 of the License.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/init.h>
  23 #include <linux/module.h>
  24 #include <linux/dma-mapping.h>
  25 #include <linux/err.h>
  26
  27 #include <asm/udbg.h>
  28 #include <asm/lv1call.h>
  29 #include <asm/firmware.h>
  30
  31 #include "platform.h"
  32
  33 #define dump_mmio_region(_a) _dump_mmio_region(_a, __func__, __LINE__)
  34 static void _dump_mmio_region(const struct ps3_mmio_region* r,
  35         const char* func, int line)
  36 {
  37         pr_debug("%s:%d: dev       %u:%u\n", func, line, r->did.bus_id,
  38                 r->did.dev_id);
  39         pr_debug("%s:%d: bus_addr  %lxh\n", func, line, r->bus_addr);
  40         pr_debug("%s:%d: len       %lxh\n", func, line, r->len);
  41         pr_debug("%s:%d: lpar_addr %lxh\n", func, line, r->lpar_addr);
  42 }
  43
  44 int ps3_mmio_region_create(struct ps3_mmio_region *r)
  45 {
  46         int result;
  47
  48         result = lv1_map_device_mmio_region(r->did.bus_id, r->did.dev_id,
  49                 r->bus_addr, r->len, r->page_size, &r->lpar_addr);
  50
  51         if (result) {
  52                 pr_debug("%s:%d: lv1_map_device_mmio_region failed: %s\n",
  53                         __func__, __LINE__, ps3_result(result));
  54                 r->lpar_addr = 0;
  55         }
  56
  57         dump_mmio_region(r);
  58         return result;
  59 }
  60 EXPORT_SYMBOL_GPL(ps3_mmio_region_create);
  61
  62 int ps3_free_mmio_region(struct ps3_mmio_region *r)
  63 {
  64         int result;
  65
  66         result = lv1_unmap_device_mmio_region(r->did.bus_id, r->did.dev_id,
  67                 r->lpar_addr);
  68
  69         if (result)
  70                 pr_debug("%s:%d: lv1_unmap_device_mmio_region failed: %s\n",
  71                         __func__, __LINE__, ps3_result(result));
  72
  73         r->lpar_addr = 0;
  74         return result;
  75 }
  76 EXPORT_SYMBOL_GPL(ps3_free_mmio_region);
  77
  78 static int ps3_system_bus_match(struct device *_dev,
  79         struct device_driver *_drv)
  80 {
  81         int result;
  82         struct ps3_system_bus_driver *drv = to_ps3_system_bus_driver(_drv);
  83         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
  84
  85         result = dev->match_id == drv->match_id;
  86
  87         pr_info("%s:%d: dev=%u(%s), drv=%u(%s): %s\n", __func__, __LINE__,
  88                 dev->match_id, dev->core.bus_id, drv->match_id, drv->core.name,
  89                 (result ? "match" : "miss"));
  90         return result;
  91 }
  92
  93 static int ps3_system_bus_probe(struct device *_dev)
  94 {
  95         int result;
  96         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
  97         struct ps3_system_bus_driver *drv =
  98                 to_ps3_system_bus_driver(_dev->driver);
  99
 100         result = lv1_open_device(dev->did.bus_id, dev->did.dev_id, 0);
 101
 102         if (result) {
 103                 pr_debug("%s:%d: lv1_open_device failed (%d)\n",
 104                         __func__, __LINE__, result);
 105                 result = -EACCES;
 106                 goto clean_none;
 107         }
 108
 109         if (dev->d_region->did.bus_id) {
 110                 result = ps3_dma_region_create(dev->d_region);
 111
 112                 if (result) {
 113                         pr_debug("%s:%d: ps3_dma_region_create failed (%d)\n",
 114                                 __func__, __LINE__, result);
 115                         BUG_ON("check region type");
 116                         result = -EINVAL;
 117                         goto clean_device;
 118                 }
 119         }
 120
 121         BUG_ON(!drv);
 122
 123         if (drv->probe)
 124                 result = drv->probe(dev);
 125         else
 126                 pr_info("%s:%d: %s no probe method\n", __func__, __LINE__,
 127                         dev->core.bus_id);
 128
 129         if (result) {
 130                 pr_debug("%s:%d: drv->probe failed\n", __func__, __LINE__);
 131                 goto clean_dma;
 132         }
 133
 134         return result;
 135
 136 clean_dma:
 137         ps3_dma_region_free(dev->d_region);
 138 clean_device:
 139         lv1_close_device(dev->did.bus_id, dev->did.dev_id);
 140 clean_none:
 141         return result;
 142 }
 143
 144 static int ps3_system_bus_remove(struct device *_dev)
 145 {
 146         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 147         struct ps3_system_bus_driver *drv =
 148                 to_ps3_system_bus_driver(_dev->driver);
 149
 150         if (drv->remove)
 151                 drv->remove(dev);
 152         else
 153                 pr_info("%s:%d: %s no remove method\n", __func__, __LINE__,
 154                         dev->core.bus_id);
 155
 156         ps3_dma_region_free(dev->d_region);
 157         ps3_free_mmio_region(dev->m_region);
 158         lv1_close_device(dev->did.bus_id, dev->did.dev_id);
 159
 160         return 0;
 161 }
 162
 163 struct bus_type ps3_system_bus_type = {
 164         .name = "ps3_system_bus",
 165         .match = ps3_system_bus_match,
 166         .probe = ps3_system_bus_probe,
 167         .remove = ps3_system_bus_remove,
 168 };
 169
 170 int __init ps3_system_bus_init(void)
 171 {
 172         int result;
 173
 174         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
 175                 return -ENODEV;
 176
 177         result = bus_register(&ps3_system_bus_type);
 178         BUG_ON(result);
 179         return result;
 180 }
 181
 182 core_initcall(ps3_system_bus_init);
 183
 184 /* Allocates a contiguous real buffer and creates mappings over it.
 185  * Returns the virtual address of the buffer and sets dma_handle
 186  * to the dma address (mapping) of the first page.
 187  */
 188
 189 static void * ps3_alloc_coherent(struct device *_dev, size_t size,
 190         dma_addr_t *dma_handle, gfp_t flag)
 191 {
 192         int result;
 193         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 194         unsigned long virt_addr;
 195
 196         BUG_ON(!dev->d_region->bus_addr);
 197
 198         flag &= ~(__GFP_DMA | __GFP_HIGHMEM);
 199         flag |= __GFP_ZERO;
 200
 201         virt_addr = __get_free_pages(flag, get_order(size));
 202
 203         if (!virt_addr) {
 204                 pr_debug("%s:%d: get_free_pages failed\n", __func__, __LINE__);
 205                 goto clean_none;
 206         }
 207
 208         result = ps3_dma_map(dev->d_region, virt_addr, size, dma_handle);
 209
 210         if (result) {
 211                 pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
 212                         __func__, __LINE__, result);
 213                 BUG_ON("check region type");
 214                 goto clean_alloc;
 215         }
 216
 217         return (void*)virt_addr;
 218
 219 clean_alloc:
 220         free_pages(virt_addr, get_order(size));
 221 clean_none:
 222         dma_handle = NULL;
 223         return NULL;
 224 }
 225
 226 static void ps3_free_coherent(struct device *_dev, size_t size, void *vaddr,
 227         dma_addr_t dma_handle)
 228 {
 229         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 230
 231         ps3_dma_unmap(dev->d_region, dma_handle, size);
 232         free_pages((unsigned long)vaddr, get_order(size));
 233 }
 234
 235 /* Creates TCEs for a user provided buffer.  The user buffer must be
 236  * contiguous real kernel storage (not vmalloc).  The address of the buffer
 237  * passed here is the kernel (virtual) address of the buffer.  The buffer
 238  * need not be page aligned, the dma_addr_t returned will point to the same
 239  * byte within the page as vaddr.
 240  */
 241
 242 static dma_addr_t ps3_map_single(struct device *_dev, void *ptr, size_t size,
 243         enum dma_data_direction direction)
 244 {
 245         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 246         int result;
 247         unsigned long bus_addr;
 248
 249         result = ps3_dma_map(dev->d_region, (unsigned long)ptr, size,
 250                 &bus_addr);
 251
 252         if (result) {
 253                 pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
 254                         __func__, __LINE__, result);
 255         }
 256
 257         return bus_addr;
 258 }
 259
 260 static void ps3_unmap_single(struct device *_dev, dma_addr_t dma_addr,
 261         size_t size, enum dma_data_direction direction)
 262 {
 263         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 264         int result;
 265
 266         result = ps3_dma_unmap(dev->d_region, dma_addr, size);
 267
 268         if (result) {
 269                 pr_debug("%s:%d: ps3_dma_unmap failed (%d)\n",
 270                         __func__, __LINE__, result);
 271         }
 272 }
 273
 274 static int ps3_map_sg(struct device *_dev, struct scatterlist *sg, int nents,
 275         enum dma_data_direction direction)
 276 {
 277         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 278         int i;
 279
 280 #if defined(CONFIG_PS3_DYNAMIC_DMA)
 281         BUG_ON("do");
 282         return -EPERM;
 283 #else
 284         for (i = 0; i < nents; i++, sg++) {
 285                 int result = ps3_dma_map(dev->d_region,
 286                         page_to_phys(sg->page) + sg->offset, sg->length,
 287                         &sg->dma_address);
 288
 289                 if (result) {
 290                         pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
 291                                 __func__, __LINE__, result);
 292                         return -EINVAL;
 293                 }
 294
 295                 sg->dma_length = sg->length;
 296         }
 297
 298         return nents;
 299 #endif
 300 }
 301
 302 static void ps3_unmap_sg(struct device *_dev, struct scatterlist *sg,
 303         int nents, enum dma_data_direction direction)
 304 {
 305 #if defined(CONFIG_PS3_DYNAMIC_DMA)
 306         BUG_ON("do");
 307 #endif
 308 }
 309
 310 static int ps3_dma_supported(struct device *_dev, u64 mask)
 311 {
 312         return mask >= DMA_32BIT_MASK;
 313 }
 314
 315 static struct dma_mapping_ops ps3_dma_ops = {
 316         .alloc_coherent = ps3_alloc_coherent,
 317         .free_coherent = ps3_free_coherent,
 318         .map_single = ps3_map_single,
 319         .unmap_single = ps3_unmap_single,
 320         .map_sg = ps3_map_sg,
 321         .unmap_sg = ps3_unmap_sg,
 322         .dma_supported = ps3_dma_supported
 323 };
 324
 325 /**
 326  * ps3_system_bus_release_device - remove a device from the system bus
 327  */
 328
 329 static void ps3_system_bus_release_device(struct device *_dev)
 330 {
 331         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 332         kfree(dev);
 333 }
 334
 335 /**
 336  * ps3_system_bus_device_register - add a device to the system bus
 337  *
 338  * ps3_system_bus_device_register() expects the dev object to be allocated
 339  * dynamically by the caller.  The system bus takes ownership of the dev
 340  * object and frees the object in ps3_system_bus_release_device().
 341  */
 342
 343 int ps3_system_bus_device_register(struct ps3_system_bus_device *dev)
 344 {
 345         int result;
 346         static unsigned int dev_count = 1;
 347
 348         dev->core.parent = NULL;
 349         dev->core.bus = &ps3_system_bus_type;
 350         dev->core.release = ps3_system_bus_release_device;
 351
 352         dev->core.archdata.of_node = NULL;
 353         dev->core.archdata.dma_ops = &ps3_dma_ops;
 354         dev->core.archdata.numa_node = 0;
 355
 356         snprintf(dev->core.bus_id, sizeof(dev->core.bus_id), "sb_%02x",
 357                 dev_count++);
 358
 359         pr_debug("%s:%d add %s\n", __func__, __LINE__, dev->core.bus_id);
 360
 361         result = device_register(&dev->core);
 362         return result;
 363 }
 364
 365 EXPORT_SYMBOL_GPL(ps3_system_bus_device_register);
 366
 367 int ps3_system_bus_driver_register(struct ps3_system_bus_driver *drv)
 368 {
 369         int result;
 370
 371         drv->core.bus = &ps3_system_bus_type;
 372
 373         result = driver_register(&drv->core);
 374         return result;
 375 }
 376
 377 EXPORT_SYMBOL_GPL(ps3_system_bus_driver_register);
 378
 379 void ps3_system_bus_driver_unregister(struct ps3_system_bus_driver *drv)
 380 {
 381         driver_unregister(&drv->core);
 382 }
 383
 384 EXPORT_SYMBOL_GPL(ps3_system_bus_driver_unregister);