Shad Ansari | 2f7f9be | 2017-06-07 13:34:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | <:copyright-BRCM:2016:DUAL/GPL:standard |
| 3 | |
| 4 | Broadcom Proprietary and Confidential.(c) 2016 Broadcom |
| 5 | All Rights Reserved |
| 6 | |
| 7 | Unless you and Broadcom execute a separate written software license |
| 8 | agreement governing use of this software, this software is licensed |
| 9 | to you under the terms of the GNU General Public License version 2 |
| 10 | (the "GPL"), available at http://www.broadcom.com/licenses/GPLv2.php, |
| 11 | with the following added to such license: |
| 12 | |
| 13 | As a special exception, the copyright holders of this software give |
| 14 | you permission to link this software with independent modules, and |
| 15 | to copy and distribute the resulting executable under terms of your |
| 16 | choice, provided that you also meet, for each linked independent |
| 17 | module, the terms and conditions of the license of that module. |
| 18 | An independent module is a module which is not derived from this |
| 19 | software. The special exception does not apply to any modifications |
| 20 | of the software. |
| 21 | |
| 22 | Not withstanding the above, under no circumstances may you combine |
| 23 | this software in any way with any other Broadcom software provided |
| 24 | under a license other than the GPL, without Broadcom's express prior |
| 25 | written consent. |
| 26 | |
| 27 | :> |
| 28 | */ |
| 29 | |
| 30 | /* |
| 31 | * bcmos_system.c |
| 32 | * |
| 33 | * This file implements a subset of OS Abstraction services |
| 34 | * for linux kernel |
| 35 | */ |
| 36 | |
| 37 | #include <bcmos_system.h> |
| 38 | |
| 39 | #include <linux/delay.h> |
| 40 | #include <linux/pci.h> |
| 41 | #include <asm-generic/pci-dma-compat.h> |
| 42 | #include <linux/fs.h> |
| 43 | #include <linux/fdtable.h> |
| 44 | |
| 45 | #include <bcmolt_llpcie.h> |
| 46 | |
| 47 | /* task control blocks */ |
| 48 | extern STAILQ_HEAD(task_list, bcmos_task) task_list; |
| 49 | |
| 50 | /* global OS lock */ |
| 51 | extern bcmos_mutex bcmos_res_lock; |
| 52 | |
| 53 | /* Initialize system library */ |
| 54 | bcmos_errno bcmos_sys_init(void) |
| 55 | { |
| 56 | return BCM_ERR_OK; |
| 57 | } |
| 58 | /* Clean-up system library */ |
| 59 | void bcmos_sys_exit(void) |
| 60 | { |
| 61 | } |
| 62 | |
| 63 | /* |
| 64 | * Thread handler |
| 65 | */ |
| 66 | static int bcmos_task_handler(void *data) |
| 67 | { |
| 68 | bcmos_task *task = (bcmos_task *)data; |
| 69 | F_bcmos_task_handler handler; |
| 70 | long handler_data; |
| 71 | |
| 72 | task->sys_task.t = current; |
| 73 | |
| 74 | if (task->parm.handler) |
| 75 | { |
| 76 | /* "traditional task */ |
| 77 | handler = task->parm.handler; |
| 78 | handler_data = task->parm.data; |
| 79 | } |
| 80 | else |
| 81 | { |
| 82 | /* "integrated" task */ |
| 83 | handler = bcmos_dft_task_handler; |
| 84 | handler_data = (long)task; |
| 85 | } |
| 86 | handler(handler_data); |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | void _bcmos_backtrace(void) |
| 92 | { |
| 93 | /*todo implement this*/ |
| 94 | } |
| 95 | |
| 96 | /* Create a new task. |
| 97 | * Attention! Priority is ignored. |
| 98 | */ |
| 99 | bcmos_errno bcmos_task_create(bcmos_task *task, const bcmos_task_parm *parm) |
| 100 | { |
| 101 | struct task_struct *t; |
| 102 | bcmos_errno rc; |
| 103 | |
| 104 | if (!task || !parm) |
| 105 | return BCM_ERR_PARM; |
| 106 | |
| 107 | memset(task, 0, sizeof(*task)); |
| 108 | task->parm = *parm; |
| 109 | if (!parm->handler) |
| 110 | { |
| 111 | /* Initialize and lock mutex to wait on */ |
| 112 | rc = bcmos_sem_create(&task->active_sem, 0, task->parm.flags, parm->name); |
| 113 | if (rc) |
| 114 | { |
| 115 | BCMOS_TRACE_ERR("Task %s: can't create active_sem. Error %s (%d)\n", |
| 116 | task->parm.name, bcmos_strerror(rc), rc); |
| 117 | return rc; |
| 118 | } |
| 119 | } |
| 120 | /* Copy name to make sure that it is not released - in case it was on the stack */ |
| 121 | if (task->parm.name) |
| 122 | { |
| 123 | strncpy(task->name, task->parm.name, sizeof(task->name) - 1); |
| 124 | task->parm.name = task->name; |
| 125 | } |
| 126 | bcmos_fastlock_init(&task->active_lock, 0); |
| 127 | task->magic = BCMOS_TASK_MAGIC; |
| 128 | bcmos_mutex_lock(&bcmos_res_lock); |
| 129 | STAILQ_INSERT_TAIL(&task_list, task, list); |
| 130 | bcmos_mutex_unlock(&bcmos_res_lock); |
| 131 | |
| 132 | t = kthread_run(bcmos_task_handler, task, parm->name); |
| 133 | if (t == ERR_PTR(-ENOMEM)) |
| 134 | { |
| 135 | bcmos_mutex_lock(&bcmos_res_lock); |
| 136 | STAILQ_REMOVE(&task_list, task, bcmos_task, list); |
| 137 | bcmos_mutex_unlock(&bcmos_res_lock); |
| 138 | task->magic = 0; |
| 139 | return BCM_ERR_NOMEM; |
| 140 | } |
| 141 | |
| 142 | return BCM_ERR_OK; |
| 143 | } |
| 144 | |
| 145 | /* Destroy task */ |
| 146 | bcmos_errno bcmos_task_destroy(bcmos_task *task) |
| 147 | { |
| 148 | if (task->magic != BCMOS_TASK_MAGIC) |
| 149 | { |
| 150 | return BCM_ERR_PARM; |
| 151 | } |
| 152 | if (!task->sys_task.t) |
| 153 | { |
| 154 | return BCM_ERR_NOENT; |
| 155 | } |
| 156 | task->destroy_request = BCMOS_TRUE; |
| 157 | task->magic = BCMOS_TASK_MAGIC_DESTROYED; |
| 158 | bcmos_mutex_lock(&bcmos_res_lock); |
| 159 | STAILQ_REMOVE(&task_list, task, bcmos_task, list); |
| 160 | bcmos_mutex_unlock(&bcmos_res_lock); |
| 161 | /* The task may be waiting on semaphore. Kick it */ |
| 162 | if (!task->parm.handler) |
| 163 | { |
| 164 | bcmos_sem_post(&task->active_sem); |
| 165 | } |
| 166 | |
| 167 | /* Sometimes by the time we get here the task has already been disposed of. |
| 168 | * TODO: investigate why */ |
| 169 | if (task->sys_task.t->cred != NULL) |
| 170 | { |
| 171 | kthread_stop(task->sys_task.t); |
| 172 | } |
| 173 | return BCM_ERR_OK; |
| 174 | } |
| 175 | |
| 176 | /** Get current task |
| 177 | * \returns task handle or NULL if not in task context |
| 178 | */ |
| 179 | bcmos_task *bcmos_task_current(void) |
| 180 | { |
| 181 | struct task_struct *kt = current; |
| 182 | bcmos_task *t, *tmp; |
| 183 | |
| 184 | STAILQ_FOREACH_SAFE(t, &task_list, list, tmp) |
| 185 | { |
| 186 | if (t->sys_task.t == kt) |
| 187 | break; |
| 188 | } |
| 189 | return t; |
| 190 | } |
| 191 | |
| 192 | /* timer signal handler */ |
| 193 | static void sys_timer_handler(unsigned long data) |
| 194 | { |
| 195 | bcmos_sys_timer *timer = (bcmos_sys_timer *)data; |
| 196 | timer->handler(timer->data); |
| 197 | } |
| 198 | |
| 199 | /* Create timer */ |
| 200 | bcmos_errno bcmos_sys_timer_create(bcmos_sys_timer *timer, bcmos_sys_timer_handler handler, void *data) |
| 201 | { |
| 202 | if (!timer || !handler) |
| 203 | BCMOS_TRACE_RETURN(BCM_ERR_PARM, "timer %p, handler %p\n", timer, handler); |
| 204 | |
| 205 | timer->handler = handler; |
| 206 | timer->data = data; |
| 207 | init_timer(&timer->t); |
| 208 | timer->t.function = sys_timer_handler; |
| 209 | timer->t.data = (unsigned long)timer; |
| 210 | |
| 211 | return BCM_ERR_OK; |
| 212 | } |
| 213 | |
| 214 | /* Destroy timer */ |
| 215 | void bcmos_sys_timer_destroy(bcmos_sys_timer *timer) |
| 216 | { |
| 217 | del_timer_sync(&timer->t); |
| 218 | } |
| 219 | |
| 220 | /* (Re)start timer */ |
| 221 | void bcmos_sys_timer_start(bcmos_sys_timer *timer, uint32_t delay) |
| 222 | { |
| 223 | /* Convert delay us --> ticks */ |
| 224 | uint32_t ticks = usecs_to_jiffies(delay); |
| 225 | mod_timer(&timer->t, jiffies + ticks); |
| 226 | } |
| 227 | |
| 228 | /* Stop timer if running */ |
| 229 | void bcmos_sys_timer_stop(bcmos_sys_timer *timer) |
| 230 | { |
| 231 | /* No need to do anything. System timer isn't running */ |
| 232 | } |
| 233 | |
| 234 | void bcmos_usleep(uint32_t u) |
| 235 | { |
| 236 | if (u >= 10000) |
| 237 | msleep((u + 999) / 1000); |
| 238 | else |
| 239 | udelay(u); |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | * Semaphore |
| 244 | */ |
| 245 | |
| 246 | /* Decrement semaphore counter. Wait if the counter is 0. |
| 247 | */ |
| 248 | bcmos_errno bcmos_sem_wait(bcmos_sem *sem, uint32_t timeout) |
| 249 | { |
| 250 | if (timeout) |
| 251 | { |
| 252 | if (timeout != BCMOS_WAIT_FOREVER) |
| 253 | { |
| 254 | if (down_timeout(&sem->s, usecs_to_jiffies(timeout))) |
| 255 | return BCM_ERR_TIMEOUT; |
| 256 | } |
| 257 | else |
| 258 | { |
| 259 | if (down_interruptible(&sem->s)) |
| 260 | return BCM_ERR_INTERNAL; |
| 261 | } |
| 262 | return BCM_ERR_OK; |
| 263 | } |
| 264 | |
| 265 | /* 0 timeout */ |
| 266 | if (down_trylock(&sem->s)) |
| 267 | { |
| 268 | return BCM_ERR_NOENT; |
| 269 | } |
| 270 | return BCM_ERR_OK; |
| 271 | } |
| 272 | |
| 273 | |
| 274 | /* |
| 275 | * Byte memory pool |
| 276 | */ |
| 277 | |
| 278 | /* Memory block header */ |
| 279 | typedef struct bcmos_byte_memblk |
| 280 | { |
| 281 | bcmos_byte_pool *pool; /** pool that owns the block */ |
| 282 | uint32_t size; /** block size (bytes) including bcmos_byte_memblk header */ |
| 283 | #ifdef BCMOS_MEM_DEBUG |
| 284 | uint32_t magic; /** magic number */ |
| 285 | #define BCMOS_MEM_MAGIC_ALLOC (('m'<<24) | ('b' << 16) | ('l' << 8) | 'k') |
| 286 | #define BCMOS_MEM_MAGIC_FREE (('m'<<24) | ('b' << 16) | ('l' << 8) | '~') |
| 287 | #endif |
| 288 | } bcmos_byte_memblk; |
| 289 | |
| 290 | /* Create byte memory pool */ |
| 291 | bcmos_errno bcmos_byte_pool_create(bcmos_byte_pool *pool, const bcmos_byte_pool_parm *parm) |
| 292 | { |
| 293 | if (!pool || !parm) |
| 294 | { |
| 295 | BCMOS_TRACE_RETURN(BCM_ERR_PARM, "pool %p, parm %p\n", pool, parm); |
| 296 | } |
| 297 | |
| 298 | BCM_MEMZERO_STRUCT(pool); |
| 299 | pool->parm = *parm; |
| 300 | if (!pool->parm.size) |
| 301 | { |
| 302 | BCMOS_TRACE_RETURN(BCM_ERR_PARM, "size %u\n", parm->size); |
| 303 | } |
| 304 | #ifdef BCMOS_MEM_DEBUG |
| 305 | pool->magic = BCMOS_BYTE_POOL_VALID; |
| 306 | #endif |
| 307 | return BCM_ERR_OK; |
| 308 | } |
| 309 | |
| 310 | /* Destroy memory pool */ |
| 311 | bcmos_errno bcmos_byte_pool_destroy(bcmos_byte_pool *pool) |
| 312 | { |
| 313 | if (pool->allocated) |
| 314 | { |
| 315 | BCMOS_TRACE_RETURN(BCM_ERR_STATE, "%u bytes of memory are still allocated from the pool %s\n", |
| 316 | pool->allocated, pool->parm.name); |
| 317 | } |
| 318 | #ifdef BCMOS_MEM_DEBUG |
| 319 | pool->magic = BCMOS_BYTE_POOL_DELETED; |
| 320 | #endif |
| 321 | return BCM_ERR_OK; |
| 322 | } |
| 323 | |
| 324 | /* Allocate memory from memory pool */ |
| 325 | void *bcmos_byte_pool_alloc(bcmos_byte_pool *pool, uint32_t size) |
| 326 | { |
| 327 | bcmos_byte_memblk *blk; |
| 328 | uint32_t byte_size; |
| 329 | void *ptr; |
| 330 | |
| 331 | #ifdef BCMOS_MEM_DEBUG |
| 332 | BUG_ON(pool->magic != BCMOS_BYTE_POOL_VALID); |
| 333 | #endif |
| 334 | |
| 335 | if (size + pool->allocated > pool->parm.size) |
| 336 | return NULL; |
| 337 | |
| 338 | byte_size = size + sizeof(bcmos_byte_memblk); |
| 339 | #ifdef BCMOS_MEM_DEBUG |
| 340 | byte_size += sizeof(uint32_t); /* block suffix */ |
| 341 | #endif |
| 342 | /* ToDo: Maintain LL of allocated blocks */ |
| 343 | blk = (bcmos_byte_memblk *)bcmos_alloc(byte_size); |
| 344 | if (!blk) |
| 345 | return NULL; |
| 346 | ptr = (void *)(blk + 1); |
| 347 | blk->size = byte_size; |
| 348 | pool->allocated += byte_size; |
| 349 | blk->pool = pool; |
| 350 | #ifdef BCMOS_MEM_DEBUG |
| 351 | blk->magic = BCMOS_MEM_MAGIC_ALLOC; |
| 352 | *(uint32_t *)((long)blk + byte_size - sizeof(uint32_t)) = BCMOS_MEM_MAGIC_ALLOC; |
| 353 | #endif |
| 354 | |
| 355 | return ptr; |
| 356 | } |
| 357 | |
| 358 | /* Release memory allocated using bcmos_byte_pool_alloc() */ |
| 359 | void bcmos_byte_pool_free(void *ptr) |
| 360 | { |
| 361 | bcmos_byte_memblk *blk; |
| 362 | bcmos_byte_pool *pool; |
| 363 | |
| 364 | BUG_ON(!ptr); |
| 365 | blk = (bcmos_byte_memblk *)((long)ptr - sizeof(bcmos_byte_memblk)); |
| 366 | pool = blk->pool; |
| 367 | #ifdef BCMOS_MEM_DEBUG |
| 368 | BUG_ON(pool->magic != BCMOS_BYTE_POOL_VALID); |
| 369 | BUG_ON(blk->magic != BCMOS_MEM_MAGIC_ALLOC); |
| 370 | BUG_ON(*(uint32_t *)((long)blk + blk->size - sizeof(uint32_t)) != BCMOS_MEM_MAGIC_ALLOC); |
| 371 | blk->magic = BCMOS_MEM_MAGIC_FREE; |
| 372 | #endif |
| 373 | pool->allocated -= blk->size; |
| 374 | bcmos_free(blk); |
| 375 | } |
| 376 | |
| 377 | /* |
| 378 | * DMA-able memory management |
| 379 | */ |
| 380 | |
| 381 | /* Dma-able block header */ |
| 382 | typedef struct |
| 383 | { |
| 384 | struct pci_dev *pdev; |
| 385 | dma_addr_t dma_handle; |
| 386 | uint32_t size; |
| 387 | } bcmos_dma_mem_hdr; |
| 388 | |
| 389 | /* Allocate DMA-able memory */ |
| 390 | void *bcmos_dma_alloc(uint8_t device, uint32_t size) |
| 391 | { |
| 392 | bcmos_dma_mem_hdr hdr = |
| 393 | { |
| 394 | .pdev = (struct pci_dev *)bcm_ll_pcie_dev_get(device), |
| 395 | .size = size |
| 396 | }; |
| 397 | void *ptr; |
| 398 | |
| 399 | if (!hdr.pdev) |
| 400 | { |
| 401 | return NULL; |
| 402 | } |
| 403 | |
| 404 | ptr = pci_alloc_consistent(hdr.pdev, size + sizeof(bcmos_dma_mem_hdr), &hdr.dma_handle); |
| 405 | if (ptr) |
| 406 | { |
| 407 | memcpy(ptr, &hdr, sizeof(hdr)); |
| 408 | } |
| 409 | return (void *)((long)ptr + sizeof(hdr)); |
| 410 | } |
| 411 | |
| 412 | /* Release DMA-able memory */ |
| 413 | void bcmos_dma_free(uint8_t device, void *ptr) |
| 414 | { |
| 415 | bcmos_dma_mem_hdr hdr; |
| 416 | |
| 417 | /* Step back to prefix area */ |
| 418 | ptr = (void *)((long)ptr - sizeof(hdr)); |
| 419 | memcpy(&hdr, ptr, sizeof(hdr)); |
| 420 | |
| 421 | /* Sanity check */ |
| 422 | if (!hdr.pdev || hdr.pdev != bcm_ll_pcie_dev_get(device)) |
| 423 | { |
| 424 | BCMOS_TRACE_ERR("!!!Attempt to release insane DMA-able pointer. ptr=%p pdev=%p/%p\n", |
| 425 | ptr, hdr.pdev, bcm_ll_pcie_dev_get(device)); |
| 426 | return; |
| 427 | } |
| 428 | pci_free_consistent(hdr.pdev, hdr.size, ptr, hdr.dma_handle); |
| 429 | } |
| 430 | |
| 431 | /* |
| 432 | * Print to the current process' stdout |
| 433 | */ |
| 434 | |
| 435 | #ifndef STDOUT_FILENO |
| 436 | #define STDOUT_FILENO 1 |
| 437 | #endif |
| 438 | |
| 439 | static int _bcmos_write(struct file *fd, const unsigned char *buf, int len) |
| 440 | { |
| 441 | mm_segment_t oldfs; |
| 442 | int len0 = len; |
| 443 | oldfs = get_fs(); |
| 444 | set_fs(KERNEL_DS); |
| 445 | while(len) |
| 446 | { |
| 447 | int lw; |
| 448 | lw = vfs_write(fd, (char *)buf, len, &fd->f_pos); |
| 449 | if (lw < 0) |
| 450 | break; |
| 451 | len -= lw; |
| 452 | if (len) |
| 453 | { |
| 454 | if (msleep_interruptible(1)) |
| 455 | break; |
| 456 | buf += lw; |
| 457 | } |
| 458 | } |
| 459 | set_fs(oldfs); |
| 460 | return (len0 - len); |
| 461 | } |
| 462 | |
| 463 | int bcmos_sys_vprintf(const char *format, va_list args) |
| 464 | { |
| 465 | struct file *f; |
| 466 | int rc=0; |
| 467 | |
| 468 | /* Get stdout file handle if any */ |
| 469 | if (in_interrupt() || !current || !current->files) |
| 470 | f = 0; |
| 471 | else |
| 472 | f = fcheck(STDOUT_FILENO); |
| 473 | if (!f) |
| 474 | { |
| 475 | rc = vprintk(format, args); |
| 476 | } |
| 477 | else |
| 478 | { |
| 479 | char printbuf[1024]; |
| 480 | char *p1=printbuf, *p2; |
| 481 | vscnprintf(printbuf, sizeof(printbuf)-1, format, args); |
| 482 | printbuf[sizeof(printbuf)-1]=0; |
| 483 | do |
| 484 | { |
| 485 | p2 = strchr(p1, '\n'); |
| 486 | if (p2) |
| 487 | { |
| 488 | rc += _bcmos_write(f, (unsigned char*) p1, p2-p1+1); |
| 489 | rc += _bcmos_write(f, (unsigned char*)"\r", 1); |
| 490 | } |
| 491 | else |
| 492 | { |
| 493 | rc += _bcmos_write(f, (unsigned char*)p1, strlen(p1)); |
| 494 | } |
| 495 | p1 = p2 + 1; |
| 496 | } while(p2); |
| 497 | } |
| 498 | return rc; |
| 499 | } |
| 500 | |
| 501 | static int os_linux_module_init(void) |
| 502 | { |
| 503 | bcmos_errno rc; |
| 504 | |
| 505 | rc = bcmos_init(); |
| 506 | |
| 507 | return rc ? -EINVAL : 0; |
| 508 | } |
| 509 | |
| 510 | static void os_linux_module_exit(void) |
| 511 | { |
| 512 | bcmos_exit(); |
| 513 | } |
| 514 | |
| 515 | module_init(os_linux_module_init); |
| 516 | module_exit(os_linux_module_exit); |
| 517 | |
| 518 | MODULE_DESCRIPTION("OS Abstraction"); |
| 519 | MODULE_LICENSE("Dual BSD/GPL"); |
| 520 | |
| 521 | EXPORT_SYMBOL(bcmos_task_create); |
| 522 | EXPORT_SYMBOL(bcmos_task_destroy); |
| 523 | EXPORT_SYMBOL(bcmos_task_current); |
| 524 | EXPORT_SYMBOL(bcmos_sem_wait); |
| 525 | EXPORT_SYMBOL(bcmos_sys_trace_level); |
| 526 | EXPORT_SYMBOL(bcmos_usleep); |
| 527 | EXPORT_SYMBOL(bcmos_byte_pool_create); |
| 528 | EXPORT_SYMBOL(bcmos_byte_pool_destroy); |
| 529 | EXPORT_SYMBOL(bcmos_byte_pool_alloc); |
| 530 | EXPORT_SYMBOL(bcmos_byte_pool_free); |
| 531 | EXPORT_SYMBOL(bcmos_sys_vprintf); |
| 532 | EXPORT_SYMBOL(bcmos_dma_alloc); |
| 533 | EXPORT_SYMBOL(bcmos_dma_free); |
| 534 | EXPORT_SYMBOL(_bcmos_backtrace); |
| 535 | EXPORT_SYMBOL(sw_error_handler); |
| 536 | EXPORT_SYMBOL(bcmos_exit); |