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 61 int ps3_free_mmio_region(struct ps3_mmio_region *r) 62 { 63 int result; 64 65 result = lv1_unmap_device_mmio_region(r->did.bus_id, r->did.dev_id, 66 r->lpar_addr); 67 68 if (result) 69 pr_debug("%s:%d: lv1_unmap_device_mmio_region failed: %s\n", 70 __func__, __LINE__, ps3_result(result)); 71 72 r->lpar_addr = 0; 73 return result; 74 } 75 76 static int ps3_system_bus_match(struct device *_dev, 77 struct device_driver *_drv) 78 { 79 int result; 80 struct ps3_system_bus_driver *drv = to_ps3_system_bus_driver(_drv); 81 struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev); 82 83 result = dev->match_id == drv->match_id; 84 85 pr_info("%s:%d: dev=%u(%s), drv=%u(%s): %s\n", __func__, __LINE__, 86 dev->match_id, dev->core.bus_id, drv->match_id, drv->core.name, 87 (result ? "match" : "miss")); 88 return result; 89 } 90 91 static int ps3_system_bus_probe(struct device *_dev) 92 { 93 int result; 94 struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev); 95 struct ps3_system_bus_driver *drv = 96 to_ps3_system_bus_driver(_dev->driver); 97 98 result = lv1_open_device(dev->did.bus_id, dev->did.dev_id, 0); 99 100 if (result) { 101 pr_debug("%s:%d: lv1_open_device failed (%d)\n", 102 __func__, __LINE__, result); 103 result = -EACCES; 104 goto clean_none; 105 } 106 107 if (dev->d_region->did.bus_id) { 108 result = ps3_dma_region_create(dev->d_region); 109 110 if (result) { 111 pr_debug("%s:%d: ps3_dma_region_create failed (%d)\n", 112 __func__, __LINE__, result); 113 BUG_ON("check region type"); 114 result = -EINVAL; 115 goto clean_device; 116 } 117 } 118 119 BUG_ON(!drv); 120 121 if (drv->probe) 122 result = drv->probe(dev); 123 else 124 pr_info("%s:%d: %s no probe method\n", __func__, __LINE__, 125 dev->core.bus_id); 126 127 if (result) { 128 pr_debug("%s:%d: drv->probe failed\n", __func__, __LINE__); 129 goto clean_dma; 130 } 131 132 return result; 133 134 clean_dma: 135 ps3_dma_region_free(dev->d_region); 136 clean_device: 137 lv1_close_device(dev->did.bus_id, dev->did.dev_id); 138 clean_none: 139 return result; 140 } 141 142 static int ps3_system_bus_remove(struct device *_dev) 143 { 144 struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev); 145 struct ps3_system_bus_driver *drv = 146 to_ps3_system_bus_driver(_dev->driver); 147 148 if (drv->remove) 149 drv->remove(dev); 150 else 151 pr_info("%s:%d: %s no remove method\n", __func__, __LINE__, 152 dev->core.bus_id); 153 154 ps3_dma_region_free(dev->d_region); 155 ps3_free_mmio_region(dev->m_region); 156 lv1_close_device(dev->did.bus_id, dev->did.dev_id); 157 158 return 0; 159 } 160 161 struct bus_type ps3_system_bus_type = { 162 .name = "ps3_system_bus", 163 .match = ps3_system_bus_match, 164 .probe = ps3_system_bus_probe, 165 .remove = ps3_system_bus_remove, 166 }; 167 168 int __init ps3_system_bus_init(void) 169 { 170 int result; 171 172 if (!firmware_has_feature(FW_FEATURE_PS3_LV1)) 173 return 0; 174 175 result = bus_register(&ps3_system_bus_type); 176 BUG_ON(result); 177 return result; 178 } 179 180 core_initcall(ps3_system_bus_init); 181 182 /* Allocates a contiguous real buffer and creates mappings over it. 183 * Returns the virtual address of the buffer and sets dma_handle 184 * to the dma address (mapping) of the first page. 185 */ 186 187 static void * ps3_alloc_coherent(struct device *_dev, size_t size, 188 dma_addr_t *dma_handle, gfp_t flag) 189 { 190 int result; 191 struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev); 192 unsigned long virt_addr; 193 194 BUG_ON(!dev->d_region->bus_addr); 195 196 flag &= ~(__GFP_DMA | __GFP_HIGHMEM); 197 flag |= __GFP_ZERO; 198 199 virt_addr = __get_free_pages(flag, get_order(size)); 200 201 if (!virt_addr) { 202 pr_debug("%s:%d: get_free_pages failed\n", __func__, __LINE__); 203 goto clean_none; 204 } 205 206 result = ps3_dma_map(dev->d_region, virt_addr, size, dma_handle); 207 208 if (result) { 209 pr_debug("%s:%d: ps3_dma_map failed (%d)\n", 210 __func__, __LINE__, result); 211 BUG_ON("check region type"); 212 goto clean_alloc; 213 } 214 215 return (void*)virt_addr; 216 217 clean_alloc: 218 free_pages(virt_addr, get_order(size)); 219 clean_none: 220 dma_handle = NULL; 221 return NULL; 222 } 223 224 static void ps3_free_coherent(struct device *_dev, size_t size, void *vaddr, 225 dma_addr_t dma_handle) 226 { 227 struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev); 228 229 ps3_dma_unmap(dev->d_region, dma_handle, size); 230 free_pages((unsigned long)vaddr, get_order(size)); 231 } 232 233 /* Creates TCEs for a user provided buffer. The user buffer must be 234 * contiguous real kernel storage (not vmalloc). The address of the buffer 235 * passed here is the kernel (virtual) address of the buffer. The buffer 236 * need not be page aligned, the dma_addr_t returned will point to the same 237 * byte within the page as vaddr. 238 */ 239 240 static dma_addr_t ps3_map_single(struct device *_dev, void *ptr, size_t size, 241 enum dma_data_direction direction) 242 { 243 struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev); 244 int result; 245 unsigned long bus_addr; 246 247 result = ps3_dma_map(dev->d_region, (unsigned long)ptr, size, 248 &bus_addr); 249 250 if (result) { 251 pr_debug("%s:%d: ps3_dma_map failed (%d)\n", 252 __func__, __LINE__, result); 253 } 254 255 return bus_addr; 256 } 257 258 static void ps3_unmap_single(struct device *_dev, dma_addr_t dma_addr, 259 size_t size, enum dma_data_direction direction) 260 { 261 struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev); 262 int result; 263 264 result = ps3_dma_unmap(dev->d_region, dma_addr, size); 265 266 if (result) { 267 pr_debug("%s:%d: ps3_dma_unmap failed (%d)\n", 268 __func__, __LINE__, result); 269 } 270 } 271 272 static int ps3_map_sg(struct device *_dev, struct scatterlist *sg, int nents, 273 enum dma_data_direction direction) 274 { 275 struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev); 276 int i; 277 278 #if defined(CONFIG_PS3_DYNAMIC_DMA) 279 BUG_ON("do"); 280 return -EPERM; 281 #else 282 for (i = 0; i < nents; i++, sg++) { 283 int result = ps3_dma_map(dev->d_region, 284 page_to_phys(sg->page) + sg->offset, sg->length, 285 &sg->dma_address); 286 287 if (result) { 288 pr_debug("%s:%d: ps3_dma_map failed (%d)\n", 289 __func__, __LINE__, result); 290 return -EINVAL; 291 } 292 293 sg->dma_length = sg->length; 294 } 295 296 return nents; 297 #endif 298 } 299 300 static void ps3_unmap_sg(struct device *_dev, struct scatterlist *sg, 301 int nents, enum dma_data_direction direction) 302 { 303 #if defined(CONFIG_PS3_DYNAMIC_DMA) 304 BUG_ON("do"); 305 #endif 306 } 307 308 static int ps3_dma_supported(struct device *_dev, u64 mask) 309 { 310 return mask >= DMA_32BIT_MASK; 311 } 312 313 static struct dma_mapping_ops ps3_dma_ops = { 314 .alloc_coherent = ps3_alloc_coherent, 315 .free_coherent = ps3_free_coherent, 316 .map_single = ps3_map_single, 317 .unmap_single = ps3_unmap_single, 318 .map_sg = ps3_map_sg, 319 .unmap_sg = ps3_unmap_sg, 320 .dma_supported = ps3_dma_supported 321 }; 322 323 /** 324 * ps3_system_bus_release_device - remove a device from the system bus 325 */ 326 327 static void ps3_system_bus_release_device(struct device *_dev) 328 { 329 struct ps3_system_bus_device *dev = to_ps3_system_bus_device(_dev); 330 kfree(dev); 331 } 332 333 /** 334 * ps3_system_bus_device_register - add a device to the system bus 335 * 336 * ps3_system_bus_device_register() expects the dev object to be allocated 337 * dynamically by the caller. The system bus takes ownership of the dev 338 * object and frees the object in ps3_system_bus_release_device(). 339 */ 340 341 int ps3_system_bus_device_register(struct ps3_system_bus_device *dev) 342 { 343 int result; 344 static unsigned int dev_count = 1; 345 346 dev->core.parent = NULL; 347 dev->core.bus = &ps3_system_bus_type; 348 dev->core.release = ps3_system_bus_release_device; 349 350 dev->core.archdata.of_node = NULL; 351 dev->core.archdata.dma_ops = &ps3_dma_ops; 352 dev->core.archdata.numa_node = 0; 353 354 snprintf(dev->core.bus_id, sizeof(dev->core.bus_id), "sb_%02x", 355 dev_count++); 356 357 pr_debug("%s:%d add %s\n", __func__, __LINE__, dev->core.bus_id); 358 359 result = device_register(&dev->core); 360 return result; 361 } 362 363 EXPORT_SYMBOL_GPL(ps3_system_bus_device_register); 364 365 int ps3_system_bus_driver_register(struct ps3_system_bus_driver *drv) 366 { 367 int result; 368 369 drv->core.bus = &ps3_system_bus_type; 370 371 result = driver_register(&drv->core); 372 return result; 373 } 374 375 EXPORT_SYMBOL_GPL(ps3_system_bus_driver_register); 376 377 void ps3_system_bus_driver_unregister(struct ps3_system_bus_driver *drv) 378 { 379 driver_unregister(&drv->core); 380 } 381 382 EXPORT_SYMBOL_GPL(ps3_system_bus_driver_unregister); 383