drivers/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/ps3.h>
  29 #include <asm/lv1call.h>
  30 #include <asm/firmware.h>
  31
  32 #define dump_mmio_region(_a) _dump_mmio_region(_a, __func__, __LINE__)
  33 static void _dump_mmio_region(const struct ps3_mmio_region* r,
  34         const char* func, int line)
  35 {
  36         pr_debug("%s:%d: dev       %u:%u\n", func, line, r->did.bus_id,
  37                 r->did.dev_id);
  38         pr_debug("%s:%d: bus_addr  %lxh\n", func, line, r->bus_addr);
  39         pr_debug("%s:%d: len       %lxh\n", func, line, r->len);
  40         pr_debug("%s:%d: lpar_addr %lxh\n", func, line, r->lpar_addr);
  41 }
  42
  43 int ps3_mmio_region_create(struct ps3_mmio_region *r)
  44 {
  45         int result;
  46
  47         result = lv1_map_device_mmio_region(r->did.bus_id, r->did.dev_id,
  48                 r->bus_addr, r->len, r->page_size, &r->lpar_addr);
  49
  50         if (result) {
  51                 pr_debug("%s:%d: lv1_map_device_mmio_region failed: %s\n",
  52                         __func__, __LINE__, ps3_result(result));
  53                 r->lpar_addr = r->len = r->bus_addr = 0;
  54         }
  55
  56         dump_mmio_region(r);
  57         return result;
  58 }
  59
  60 int ps3_free_mmio_region(struct ps3_mmio_region *r)
  61 {
  62         int result;
  63
  64         result = lv1_unmap_device_mmio_region(r->did.bus_id, r->did.dev_id,
  65                 r->bus_addr);
  66
  67         if (result)
  68                 pr_debug("%s:%d: lv1_unmap_device_mmio_region failed: %s\n",
  69                         __func__, __LINE__, ps3_result(result));
  70
  71         r->lpar_addr = r->len = r->bus_addr = 0;
  72         return result;
  73 }
  74
  75 static int ps3_system_bus_match(struct device *_dev,
  76         struct device_driver *_drv)
  77 {
  78         int result;
  79         struct ps3_system_bus_driver *drv = to_ps3_system_bus_driver(_drv);
  80         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
  81
  82         result = dev->match_id == drv->match_id;
  83
  84         pr_info("%s:%d: dev=%u(%s), drv=%u(%s): %s\n", __func__, __LINE__,
  85                 dev->match_id, dev->core.bus_id, drv->match_id, drv->core.name,
  86                 (result ? "match" : "miss"));
  87         return result;
  88 }
  89
  90 static int ps3_system_bus_probe(struct device *_dev)
  91 {
  92         int result;
  93         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
  94         struct ps3_system_bus_driver *drv =
  95                 to_ps3_system_bus_driver(_dev->driver);
  96
  97         result = lv1_open_device(dev->did.bus_id, dev->did.dev_id, 0);
  98
  99         if (result) {
 100                 pr_debug("%s:%d: lv1_open_device failed (%d)\n",
 101                         __func__, __LINE__, result);
 102                 result = -EACCES;
 103                 goto clean_none;
 104         }
 105
 106         if (dev->d_region->did.bus_id) {
 107                 result = ps3_dma_region_create(dev->d_region);
 108
 109                 if (result) {
 110                         pr_debug("%s:%d: ps3_dma_region_create failed (%d)\n",
 111                                 __func__, __LINE__, result);
 112                         BUG_ON("check region type");
 113                         result = -EINVAL;
 114                         goto clean_device;
 115                 }
 116         }
 117
 118         BUG_ON(!drv);
 119
 120         if (drv->probe)
 121                 result = drv->probe(dev);
 122         else
 123                 pr_info("%s:%d: %s no probe method\n", __func__, __LINE__,
 124                         dev->core.bus_id);
 125
 126         if (result) {
 127                 pr_debug("%s:%d: drv->probe failed\n", __func__, __LINE__);
 128                 goto clean_dma;
 129         }
 130
 131         return result;
 132
 133 clean_dma:
 134         ps3_dma_region_free(dev->d_region);
 135 clean_device:
 136         lv1_close_device(dev->did.bus_id, dev->did.dev_id);
 137 clean_none:
 138         return result;
 139 }
 140
 141 static int ps3_system_bus_remove(struct device *_dev)
 142 {
 143         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 144         struct ps3_system_bus_driver *drv =
 145                 to_ps3_system_bus_driver(_dev->driver);
 146
 147         if (drv->remove)
 148                 drv->remove(dev);
 149         else
 150                 pr_info("%s:%d: %s no remove method\n", __func__, __LINE__,
 151                         dev->core.bus_id);
 152
 153         ps3_dma_region_free(dev->d_region);
 154         ps3_free_mmio_region(dev->m_region);
 155         lv1_close_device(dev->did.bus_id, dev->did.dev_id);
 156
 157         return 0;
 158 }
 159
 160 struct bus_type ps3_system_bus_type = {
 161         .name = "ps3_system_bus",
 162         .match = ps3_system_bus_match,
 163         .probe = ps3_system_bus_probe,
 164         .remove = ps3_system_bus_remove,
 165 };
 166
 167 int __init ps3_system_bus_init(void)
 168 {
 169         int result;
 170
 171         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
 172                 return 0;
 173
 174         result = bus_register(&ps3_system_bus_type);
 175         BUG_ON(result);
 176         return result;
 177 }
 178
 179 core_initcall(ps3_system_bus_init);
 180
 181 /* Allocates a contiguous real buffer and creates mappings over it.
 182  * Returns the virtual address of the buffer and sets dma_handle
 183  * to the dma address (mapping) of the first page.
 184  */
 185
 186 static void * ps3_alloc_coherent(struct device *_dev, size_t size,
 187         dma_addr_t *dma_handle, gfp_t flag)
 188 {
 189         int result;
 190         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 191         unsigned long virt_addr;
 192
 193         BUG_ON(!dev->d_region->bus_addr);
 194
 195         flag &= ~(__GFP_DMA | __GFP_HIGHMEM);
 196         flag |= __GFP_ZERO;
 197
 198         virt_addr = __get_free_pages(flag, get_order(size));
 199
 200         if (!virt_addr) {
 201                 pr_debug("%s:%d: get_free_pages failed\n", __func__, __LINE__);
 202                 goto clean_none;
 203         }
 204
 205         result = ps3_dma_map(dev->d_region, virt_addr, size, dma_handle);
 206
 207         if (result) {
 208                 pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
 209                         __func__, __LINE__, result);
 210                 BUG_ON("check region type");
 211                 goto clean_alloc;
 212         }
 213
 214         return (void*)virt_addr;
 215
 216 clean_alloc:
 217         free_pages(virt_addr, get_order(size));
 218 clean_none:
 219         dma_handle = NULL;
 220         return NULL;
 221 }
 222
 223 static void ps3_free_coherent(struct device *_dev, size_t size, void *vaddr,
 224         dma_addr_t dma_handle)
 225 {
 226         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 227
 228         ps3_dma_unmap(dev->d_region, dma_handle, size);
 229         free_pages((unsigned long)vaddr, get_order(size));
 230 }
 231
 232 /* Creates TCEs for a user provided buffer.  The user buffer must be
 233  * contiguous real kernel storage (not vmalloc).  The address of the buffer
 234  * passed here is the kernel (virtual) address of the buffer.  The buffer
 235  * need not be page aligned, the dma_addr_t returned will point to the same
 236  * byte within the page as vaddr.
 237  */
 238
 239 static dma_addr_t ps3_map_single(struct device *_dev, void *ptr, size_t size,
 240         enum dma_data_direction direction)
 241 {
 242         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 243         int result;
 244         unsigned long bus_addr;
 245
 246         result = ps3_dma_map(dev->d_region, (unsigned long)ptr, size,
 247                 &bus_addr);
 248
 249         if (result) {
 250                 pr_debug("%s:%d: ps3_dma_map failed (%d)\n",
 251                         __func__, __LINE__, result);
 252         }
 253
 254         return bus_addr;
 255 }
 256
 257 static void ps3_unmap_single(struct device *_dev, dma_addr_t dma_addr,
 258         size_t size, enum dma_data_direction direction)
 259 {
 260         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 261         int result;
 262
 263         result = ps3_dma_unmap(dev->d_region, dma_addr, size);
 264
 265         if (result) {
 266                 pr_debug("%s:%d: ps3_dma_unmap failed (%d)\n",
 267                         __func__, __LINE__, result);
 268         }
 269 }
 270
 271 static int ps3_map_sg(struct device *_dev, struct scatterlist *sg, int nents,
 272         enum dma_data_direction direction)
 273 {
 274 #if defined(CONFIG_PS3_DYNAMIC_DMA)
 275         BUG_ON("do");
 276 #endif
 277         return 0;
 278 }
 279
 280 static void ps3_unmap_sg(struct device *_dev, struct scatterlist *sg,
 281         int nents, enum dma_data_direction direction)
 282 {
 283 #if defined(CONFIG_PS3_DYNAMIC_DMA)
 284         BUG_ON("do");
 285 #endif
 286 }
 287
 288 static int ps3_dma_supported(struct device *_dev, u64 mask)
 289 {
 290         return 1;
 291 }
 292
 293 static struct dma_mapping_ops ps3_dma_ops = {
 294         .alloc_coherent = ps3_alloc_coherent,
 295         .free_coherent = ps3_free_coherent,
 296         .map_single = ps3_map_single,
 297         .unmap_single = ps3_unmap_single,
 298         .map_sg = ps3_map_sg,
 299         .unmap_sg = ps3_unmap_sg,
 300         .dma_supported = ps3_dma_supported
 301 };
 302
 303 /**
 304  * ps3_system_bus_release_device - remove a device from the system bus
 305  */
 306
 307 static void ps3_system_bus_release_device(struct device *_dev)
 308 {
 309         struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev);
 310         kfree(dev);
 311 }
 312
 313 /**
 314  * ps3_system_bus_device_register - add a device to the system bus
 315  *
 316  * ps3_system_bus_device_register() expects the dev object to be allocated
 317  * dynamically by the caller.  The system bus takes ownership of the dev
 318  * object and frees the object in ps3_system_bus_release_device().
 319  */
 320
 321 int ps3_system_bus_device_register(struct ps3_system_bus_device *dev)
 322 {
 323         int result;
 324         static unsigned int dev_count = 1;
 325
 326         dev->core.parent = NULL;
 327         dev->core.bus = &ps3_system_bus_type;
 328         dev->core.release = ps3_system_bus_release_device;
 329
 330         dev->core.archdata.of_node = NULL;
 331         dev->core.archdata.dma_ops = &ps3_dma_ops;
 332         dev->core.archdata.numa_node = 0;
 333
 334         snprintf(dev->core.bus_id, sizeof(dev->core.bus_id), "sb_%02x",
 335                 dev_count++);
 336
 337         pr_debug("%s:%d add %s\n", __func__, __LINE__, dev->core.bus_id);
 338
 339         result = device_register(&dev->core);
 340         return result;
 341 }
 342
 343 EXPORT_SYMBOL_GPL(ps3_system_bus_device_register);
 344
 345 int ps3_system_bus_driver_register(struct ps3_system_bus_driver *drv)
 346 {
 347         int result;
 348
 349         drv->core.bus = &ps3_system_bus_type;
 350
 351         result = driver_register(&drv->core);
 352         return result;
 353 }
 354
 355 EXPORT_SYMBOL_GPL(ps3_system_bus_driver_register);
 356
 357 void ps3_system_bus_driver_unregister(struct ps3_system_bus_driver *drv)
 358 {
 359         driver_unregister(&drv->core);
 360 }
 361
 362 EXPORT_SYMBOL_GPL(ps3_system_bus_driver_unregister);