1 /* 2 * CAAM/SEC 4.x transport/backend driver 3 * JobR backend functionality 4 * 5 * Copyright 2008-2012 Freescale Semiconductor, Inc. 6 */ 7 8 #include <linux/of_irq.h> 9 #include <linux/of_address.h> 10 11 #include "compat.h" 12 #include "regs.h" 13 #include "jr.h" 14 #include "desc.h" 15 #include "intern.h" 16 17 struct jr_driver_data { 18 /* List of Physical JobR's with the Driver */ 19 struct list_head jr_list; 20 spinlock_t jr_alloc_lock; /* jr_list lock */ 21 } ____cacheline_aligned; 22 23 static struct jr_driver_data driver_data; 24 25 static int caam_reset_hw_jr(struct device *dev) 26 { 27 struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); 28 unsigned int timeout = 100000; 29 30 /* 31 * mask interrupts since we are going to poll 32 * for reset completion status 33 */ 34 setbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK); 35 36 /* initiate flush (required prior to reset) */ 37 wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET); 38 while (((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) == 39 JRINT_ERR_HALT_INPROGRESS) && --timeout) 40 cpu_relax(); 41 42 if ((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) != 43 JRINT_ERR_HALT_COMPLETE || timeout == 0) { 44 dev_err(dev, "failed to flush job ring %d\n", jrp->ridx); 45 return -EIO; 46 } 47 48 /* initiate reset */ 49 timeout = 100000; 50 wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET); 51 while ((rd_reg32(&jrp->rregs->jrcommand) & JRCR_RESET) && --timeout) 52 cpu_relax(); 53 54 if (timeout == 0) { 55 dev_err(dev, "failed to reset job ring %d\n", jrp->ridx); 56 return -EIO; 57 } 58 59 /* unmask interrupts */ 60 clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK); 61 62 return 0; 63 } 64 65 /* 66 * Shutdown JobR independent of platform property code 67 */ 68 int caam_jr_shutdown(struct device *dev) 69 { 70 struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); 71 dma_addr_t inpbusaddr, outbusaddr; 72 int ret; 73 74 ret = caam_reset_hw_jr(dev); 75 76 tasklet_kill(&jrp->irqtask); 77 78 /* Release interrupt */ 79 free_irq(jrp->irq, dev); 80 81 /* Free rings */ 82 inpbusaddr = rd_reg64(&jrp->rregs->inpring_base); 83 outbusaddr = rd_reg64(&jrp->rregs->outring_base); 84 dma_free_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH, 85 jrp->inpring, inpbusaddr); 86 dma_free_coherent(dev, sizeof(struct jr_outentry) * JOBR_DEPTH, 87 jrp->outring, outbusaddr); 88 kfree(jrp->entinfo); 89 90 return ret; 91 } 92 93 static int caam_jr_remove(struct platform_device *pdev) 94 { 95 int ret; 96 struct device *jrdev; 97 struct caam_drv_private_jr *jrpriv; 98 99 jrdev = &pdev->dev; 100 jrpriv = dev_get_drvdata(jrdev); 101 102 /* 103 * Return EBUSY if job ring already allocated. 104 */ 105 if (atomic_read(&jrpriv->tfm_count)) { 106 dev_err(jrdev, "Device is busy\n"); 107 return -EBUSY; 108 } 109 110 /* Remove the node from Physical JobR list maintained by driver */ 111 spin_lock(&driver_data.jr_alloc_lock); 112 list_del(&jrpriv->list_node); 113 spin_unlock(&driver_data.jr_alloc_lock); 114 115 /* Release ring */ 116 ret = caam_jr_shutdown(jrdev); 117 if (ret) 118 dev_err(jrdev, "Failed to shut down job ring\n"); 119 irq_dispose_mapping(jrpriv->irq); 120 121 return ret; 122 } 123 124 /* Main per-ring interrupt handler */ 125 static irqreturn_t caam_jr_interrupt(int irq, void *st_dev) 126 { 127 struct device *dev = st_dev; 128 struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); 129 u32 irqstate; 130 131 /* 132 * Check the output ring for ready responses, kick 133 * tasklet if jobs done. 134 */ 135 irqstate = rd_reg32(&jrp->rregs->jrintstatus); 136 if (!irqstate) 137 return IRQ_NONE; 138 139 /* 140 * If JobR error, we got more development work to do 141 * Flag a bug now, but we really need to shut down and 142 * restart the queue (and fix code). 143 */ 144 if (irqstate & JRINT_JR_ERROR) { 145 dev_err(dev, "job ring error: irqstate: %08x\n", irqstate); 146 BUG(); 147 } 148 149 /* mask valid interrupts */ 150 setbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK); 151 152 /* Have valid interrupt at this point, just ACK and trigger */ 153 wr_reg32(&jrp->rregs->jrintstatus, irqstate); 154 155 preempt_disable(); 156 tasklet_schedule(&jrp->irqtask); 157 preempt_enable(); 158 159 return IRQ_HANDLED; 160 } 161 162 /* Deferred service handler, run as interrupt-fired tasklet */ 163 static void caam_jr_dequeue(unsigned long devarg) 164 { 165 int hw_idx, sw_idx, i, head, tail; 166 struct device *dev = (struct device *)devarg; 167 struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); 168 void (*usercall)(struct device *dev, u32 *desc, u32 status, void *arg); 169 u32 *userdesc, userstatus; 170 void *userarg; 171 172 while (rd_reg32(&jrp->rregs->outring_used)) { 173 174 head = ACCESS_ONCE(jrp->head); 175 176 spin_lock(&jrp->outlock); 177 178 sw_idx = tail = jrp->tail; 179 hw_idx = jrp->out_ring_read_index; 180 181 for (i = 0; CIRC_CNT(head, tail + i, JOBR_DEPTH) >= 1; i++) { 182 sw_idx = (tail + i) & (JOBR_DEPTH - 1); 183 184 if (jrp->outring[hw_idx].desc == 185 jrp->entinfo[sw_idx].desc_addr_dma) 186 break; /* found */ 187 } 188 /* we should never fail to find a matching descriptor */ 189 BUG_ON(CIRC_CNT(head, tail + i, JOBR_DEPTH) <= 0); 190 191 /* Unmap just-run descriptor so we can post-process */ 192 dma_unmap_single(dev, jrp->outring[hw_idx].desc, 193 jrp->entinfo[sw_idx].desc_size, 194 DMA_TO_DEVICE); 195 196 /* mark completed, avoid matching on a recycled desc addr */ 197 jrp->entinfo[sw_idx].desc_addr_dma = 0; 198 199 /* Stash callback params for use outside of lock */ 200 usercall = jrp->entinfo[sw_idx].callbk; 201 userarg = jrp->entinfo[sw_idx].cbkarg; 202 userdesc = jrp->entinfo[sw_idx].desc_addr_virt; 203 userstatus = jrp->outring[hw_idx].jrstatus; 204 205 /* set done */ 206 wr_reg32(&jrp->rregs->outring_rmvd, 1); 207 208 jrp->out_ring_read_index = (jrp->out_ring_read_index + 1) & 209 (JOBR_DEPTH - 1); 210 211 /* 212 * if this job completed out-of-order, do not increment 213 * the tail. Otherwise, increment tail by 1 plus the 214 * number of subsequent jobs already completed out-of-order 215 */ 216 if (sw_idx == tail) { 217 do { 218 tail = (tail + 1) & (JOBR_DEPTH - 1); 219 } while (CIRC_CNT(head, tail, JOBR_DEPTH) >= 1 && 220 jrp->entinfo[tail].desc_addr_dma == 0); 221 222 jrp->tail = tail; 223 } 224 225 spin_unlock(&jrp->outlock); 226 227 /* Finally, execute user's callback */ 228 usercall(dev, userdesc, userstatus, userarg); 229 } 230 231 /* reenable / unmask IRQs */ 232 clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK); 233 } 234 235 /** 236 * caam_jr_alloc() - Alloc a job ring for someone to use as needed. 237 * 238 * returns : pointer to the newly allocated physical 239 * JobR dev can be written to if successful. 240 **/ 241 struct device *caam_jr_alloc(void) 242 { 243 struct caam_drv_private_jr *jrpriv, *min_jrpriv = NULL; 244 struct device *dev = NULL; 245 int min_tfm_cnt = INT_MAX; 246 int tfm_cnt; 247 248 spin_lock(&driver_data.jr_alloc_lock); 249 250 if (list_empty(&driver_data.jr_list)) { 251 spin_unlock(&driver_data.jr_alloc_lock); 252 return ERR_PTR(-ENODEV); 253 } 254 255 list_for_each_entry(jrpriv, &driver_data.jr_list, list_node) { 256 tfm_cnt = atomic_read(&jrpriv->tfm_count); 257 if (tfm_cnt < min_tfm_cnt) { 258 min_tfm_cnt = tfm_cnt; 259 min_jrpriv = jrpriv; 260 } 261 if (!min_tfm_cnt) 262 break; 263 } 264 265 if (min_jrpriv) { 266 atomic_inc(&min_jrpriv->tfm_count); 267 dev = min_jrpriv->dev; 268 } 269 spin_unlock(&driver_data.jr_alloc_lock); 270 271 return dev; 272 } 273 EXPORT_SYMBOL(caam_jr_alloc); 274 275 /** 276 * caam_jr_free() - Free the Job Ring 277 * @rdev - points to the dev that identifies the Job ring to 278 * be released. 279 **/ 280 void caam_jr_free(struct device *rdev) 281 { 282 struct caam_drv_private_jr *jrpriv = dev_get_drvdata(rdev); 283 284 atomic_dec(&jrpriv->tfm_count); 285 } 286 EXPORT_SYMBOL(caam_jr_free); 287 288 /** 289 * caam_jr_enqueue() - Enqueue a job descriptor head. Returns 0 if OK, 290 * -EBUSY if the queue is full, -EIO if it cannot map the caller's 291 * descriptor. 292 * @dev: device of the job ring to be used. This device should have 293 * been assigned prior by caam_jr_register(). 294 * @desc: points to a job descriptor that execute our request. All 295 * descriptors (and all referenced data) must be in a DMAable 296 * region, and all data references must be physical addresses 297 * accessible to CAAM (i.e. within a PAMU window granted 298 * to it). 299 * @cbk: pointer to a callback function to be invoked upon completion 300 * of this request. This has the form: 301 * callback(struct device *dev, u32 *desc, u32 stat, void *arg) 302 * where: 303 * @dev: contains the job ring device that processed this 304 * response. 305 * @desc: descriptor that initiated the request, same as 306 * "desc" being argued to caam_jr_enqueue(). 307 * @status: untranslated status received from CAAM. See the 308 * reference manual for a detailed description of 309 * error meaning, or see the JRSTA definitions in the 310 * register header file 311 * @areq: optional pointer to an argument passed with the 312 * original request 313 * @areq: optional pointer to a user argument for use at callback 314 * time. 315 **/ 316 int caam_jr_enqueue(struct device *dev, u32 *desc, 317 void (*cbk)(struct device *dev, u32 *desc, 318 u32 status, void *areq), 319 void *areq) 320 { 321 struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); 322 struct caam_jrentry_info *head_entry; 323 int head, tail, desc_size; 324 dma_addr_t desc_dma; 325 326 desc_size = (*desc & HDR_JD_LENGTH_MASK) * sizeof(u32); 327 desc_dma = dma_map_single(dev, desc, desc_size, DMA_TO_DEVICE); 328 if (dma_mapping_error(dev, desc_dma)) { 329 dev_err(dev, "caam_jr_enqueue(): can't map jobdesc\n"); 330 return -EIO; 331 } 332 333 spin_lock_bh(&jrp->inplock); 334 335 head = jrp->head; 336 tail = ACCESS_ONCE(jrp->tail); 337 338 if (!rd_reg32(&jrp->rregs->inpring_avail) || 339 CIRC_SPACE(head, tail, JOBR_DEPTH) <= 0) { 340 spin_unlock_bh(&jrp->inplock); 341 dma_unmap_single(dev, desc_dma, desc_size, DMA_TO_DEVICE); 342 return -EBUSY; 343 } 344 345 head_entry = &jrp->entinfo[head]; 346 head_entry->desc_addr_virt = desc; 347 head_entry->desc_size = desc_size; 348 head_entry->callbk = (void *)cbk; 349 head_entry->cbkarg = areq; 350 head_entry->desc_addr_dma = desc_dma; 351 352 jrp->inpring[jrp->inp_ring_write_index] = desc_dma; 353 354 smp_wmb(); 355 356 jrp->inp_ring_write_index = (jrp->inp_ring_write_index + 1) & 357 (JOBR_DEPTH - 1); 358 jrp->head = (head + 1) & (JOBR_DEPTH - 1); 359 360 wr_reg32(&jrp->rregs->inpring_jobadd, 1); 361 362 spin_unlock_bh(&jrp->inplock); 363 364 return 0; 365 } 366 EXPORT_SYMBOL(caam_jr_enqueue); 367 368 /* 369 * Init JobR independent of platform property detection 370 */ 371 static int caam_jr_init(struct device *dev) 372 { 373 struct caam_drv_private_jr *jrp; 374 dma_addr_t inpbusaddr, outbusaddr; 375 int i, error; 376 377 jrp = dev_get_drvdata(dev); 378 379 tasklet_init(&jrp->irqtask, caam_jr_dequeue, (unsigned long)dev); 380 381 /* Connect job ring interrupt handler. */ 382 error = request_irq(jrp->irq, caam_jr_interrupt, IRQF_SHARED, 383 dev_name(dev), dev); 384 if (error) { 385 dev_err(dev, "can't connect JobR %d interrupt (%d)\n", 386 jrp->ridx, jrp->irq); 387 irq_dispose_mapping(jrp->irq); 388 jrp->irq = 0; 389 return -EINVAL; 390 } 391 392 error = caam_reset_hw_jr(dev); 393 if (error) 394 return error; 395 396 jrp->inpring = dma_alloc_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH, 397 &inpbusaddr, GFP_KERNEL); 398 399 jrp->outring = dma_alloc_coherent(dev, sizeof(struct jr_outentry) * 400 JOBR_DEPTH, &outbusaddr, GFP_KERNEL); 401 402 jrp->entinfo = kzalloc(sizeof(struct caam_jrentry_info) * JOBR_DEPTH, 403 GFP_KERNEL); 404 405 if ((jrp->inpring == NULL) || (jrp->outring == NULL) || 406 (jrp->entinfo == NULL)) { 407 dev_err(dev, "can't allocate job rings for %d\n", 408 jrp->ridx); 409 return -ENOMEM; 410 } 411 412 for (i = 0; i < JOBR_DEPTH; i++) 413 jrp->entinfo[i].desc_addr_dma = !0; 414 415 /* Setup rings */ 416 jrp->inp_ring_write_index = 0; 417 jrp->out_ring_read_index = 0; 418 jrp->head = 0; 419 jrp->tail = 0; 420 421 wr_reg64(&jrp->rregs->inpring_base, inpbusaddr); 422 wr_reg64(&jrp->rregs->outring_base, outbusaddr); 423 wr_reg32(&jrp->rregs->inpring_size, JOBR_DEPTH); 424 wr_reg32(&jrp->rregs->outring_size, JOBR_DEPTH); 425 426 jrp->ringsize = JOBR_DEPTH; 427 428 spin_lock_init(&jrp->inplock); 429 spin_lock_init(&jrp->outlock); 430 431 /* Select interrupt coalescing parameters */ 432 setbits32(&jrp->rregs->rconfig_lo, JOBR_INTC | 433 (JOBR_INTC_COUNT_THLD << JRCFG_ICDCT_SHIFT) | 434 (JOBR_INTC_TIME_THLD << JRCFG_ICTT_SHIFT)); 435 436 return 0; 437 } 438 439 440 /* 441 * Probe routine for each detected JobR subsystem. 442 */ 443 static int caam_jr_probe(struct platform_device *pdev) 444 { 445 struct device *jrdev; 446 struct device_node *nprop; 447 struct caam_job_ring __iomem *ctrl; 448 struct caam_drv_private_jr *jrpriv; 449 static int total_jobrs; 450 int error; 451 452 jrdev = &pdev->dev; 453 jrpriv = devm_kmalloc(jrdev, sizeof(struct caam_drv_private_jr), 454 GFP_KERNEL); 455 if (!jrpriv) 456 return -ENOMEM; 457 458 dev_set_drvdata(jrdev, jrpriv); 459 460 /* save ring identity relative to detection */ 461 jrpriv->ridx = total_jobrs++; 462 463 nprop = pdev->dev.of_node; 464 /* Get configuration properties from device tree */ 465 /* First, get register page */ 466 ctrl = of_iomap(nprop, 0); 467 if (!ctrl) { 468 dev_err(jrdev, "of_iomap() failed\n"); 469 return -ENOMEM; 470 } 471 472 jrpriv->rregs = (struct caam_job_ring __force *)ctrl; 473 474 if (sizeof(dma_addr_t) == sizeof(u64)) 475 if (of_device_is_compatible(nprop, "fsl,sec-v5.0-job-ring")) 476 dma_set_mask_and_coherent(jrdev, DMA_BIT_MASK(40)); 477 else 478 dma_set_mask_and_coherent(jrdev, DMA_BIT_MASK(36)); 479 else 480 dma_set_mask_and_coherent(jrdev, DMA_BIT_MASK(32)); 481 482 /* Identify the interrupt */ 483 jrpriv->irq = irq_of_parse_and_map(nprop, 0); 484 485 /* Now do the platform independent part */ 486 error = caam_jr_init(jrdev); /* now turn on hardware */ 487 if (error) 488 return error; 489 490 jrpriv->dev = jrdev; 491 spin_lock(&driver_data.jr_alloc_lock); 492 list_add_tail(&jrpriv->list_node, &driver_data.jr_list); 493 spin_unlock(&driver_data.jr_alloc_lock); 494 495 atomic_set(&jrpriv->tfm_count, 0); 496 497 return 0; 498 } 499 500 static struct of_device_id caam_jr_match[] = { 501 { 502 .compatible = "fsl,sec-v4.0-job-ring", 503 }, 504 { 505 .compatible = "fsl,sec4.0-job-ring", 506 }, 507 {}, 508 }; 509 MODULE_DEVICE_TABLE(of, caam_jr_match); 510 511 static struct platform_driver caam_jr_driver = { 512 .driver = { 513 .name = "caam_jr", 514 .of_match_table = caam_jr_match, 515 }, 516 .probe = caam_jr_probe, 517 .remove = caam_jr_remove, 518 }; 519 520 static int __init jr_driver_init(void) 521 { 522 spin_lock_init(&driver_data.jr_alloc_lock); 523 INIT_LIST_HEAD(&driver_data.jr_list); 524 return platform_driver_register(&caam_jr_driver); 525 } 526 527 static void __exit jr_driver_exit(void) 528 { 529 platform_driver_unregister(&caam_jr_driver); 530 } 531 532 module_init(jr_driver_init); 533 module_exit(jr_driver_exit); 534 535 MODULE_LICENSE("GPL"); 536 MODULE_DESCRIPTION("FSL CAAM JR request backend"); 537 MODULE_AUTHOR("Freescale Semiconductor - NMG/STC"); 538