?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
PM / sleep: Asynchronous threads for suspend_noirq
[linux/fpc-iii.git] / drivers / crypto / caam / jr.c
blob1d80bd3636c5b1f2cf4dc078d4934e64befc7f68
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 smp_read_barrier_depends();
185
186 if (jrp->outring[hw_idx].desc ==
187 jrp->entinfo[sw_idx].desc_addr_dma)
188 break; /* found */
189 }
190 /* we should never fail to find a matching descriptor */
191 BUG_ON(CIRC_CNT(head, tail + i, JOBR_DEPTH) <= 0);
192
193 /* Unmap just-run descriptor so we can post-process */
194 dma_unmap_single(dev, jrp->outring[hw_idx].desc,
195 jrp->entinfo[sw_idx].desc_size,
196 DMA_TO_DEVICE);
197
198 /* mark completed, avoid matching on a recycled desc addr */
199 jrp->entinfo[sw_idx].desc_addr_dma = 0;
200
201 /* Stash callback params for use outside of lock */
202 usercall = jrp->entinfo[sw_idx].callbk;
203 userarg = jrp->entinfo[sw_idx].cbkarg;
204 userdesc = jrp->entinfo[sw_idx].desc_addr_virt;
205 userstatus = jrp->outring[hw_idx].jrstatus;
206
207 /* set done */
208 wr_reg32(&jrp->rregs->outring_rmvd, 1);
209
210 jrp->out_ring_read_index = (jrp->out_ring_read_index + 1) &
211 (JOBR_DEPTH - 1);
212
213 /*
214 * if this job completed out-of-order, do not increment
215 * the tail. Otherwise, increment tail by 1 plus the
216 * number of subsequent jobs already completed out-of-order
217 */
218 if (sw_idx == tail) {
219 do {
220 tail = (tail + 1) & (JOBR_DEPTH - 1);
221 smp_read_barrier_depends();
222 } while (CIRC_CNT(head, tail, JOBR_DEPTH) >= 1 &&
223 jrp->entinfo[tail].desc_addr_dma == 0);
224
225 jrp->tail = tail;
226 }
227
228 spin_unlock(&jrp->outlock);
229
230 /* Finally, execute user's callback */
231 usercall(dev, userdesc, userstatus, userarg);
232 }
233
234 /* reenable / unmask IRQs */
235 clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK);
236 }
237
238 /**
239 * caam_jr_alloc() - Alloc a job ring for someone to use as needed.
240 *
241 * returns : pointer to the newly allocated physical
242 * JobR dev can be written to if successful.
243 **/
244 struct device *caam_jr_alloc(void)
245 {
246 struct caam_drv_private_jr *jrpriv, *min_jrpriv = NULL;
247 struct device *dev = NULL;
248 int min_tfm_cnt = INT_MAX;
249 int tfm_cnt;
250
251 spin_lock(&driver_data.jr_alloc_lock);
252
253 if (list_empty(&driver_data.jr_list)) {
254 spin_unlock(&driver_data.jr_alloc_lock);
255 return ERR_PTR(-ENODEV);
256 }
257
258 list_for_each_entry(jrpriv, &driver_data.jr_list, list_node) {
259 tfm_cnt = atomic_read(&jrpriv->tfm_count);
260 if (tfm_cnt < min_tfm_cnt) {
261 min_tfm_cnt = tfm_cnt;
262 min_jrpriv = jrpriv;
263 }
264 if (!min_tfm_cnt)
265 break;
266 }
267
268 if (min_jrpriv) {
269 atomic_inc(&min_jrpriv->tfm_count);
270 dev = min_jrpriv->dev;
271 }
272 spin_unlock(&driver_data.jr_alloc_lock);
273
274 return dev;
275 }
276 EXPORT_SYMBOL(caam_jr_alloc);
277
278 /**
279 * caam_jr_free() - Free the Job Ring
280 * @rdev - points to the dev that identifies the Job ring to
281 * be released.
282 **/
283 void caam_jr_free(struct device *rdev)
284 {
285 struct caam_drv_private_jr *jrpriv = dev_get_drvdata(rdev);
286
287 atomic_dec(&jrpriv->tfm_count);
288 }
289 EXPORT_SYMBOL(caam_jr_free);
290
291 /**
292 * caam_jr_enqueue() - Enqueue a job descriptor head. Returns 0 if OK,
293 * -EBUSY if the queue is full, -EIO if it cannot map the caller's
294 * descriptor.
295 * @dev: device of the job ring to be used. This device should have
296 * been assigned prior by caam_jr_register().
297 * @desc: points to a job descriptor that execute our request. All
298 * descriptors (and all referenced data) must be in a DMAable
299 * region, and all data references must be physical addresses
300 * accessible to CAAM (i.e. within a PAMU window granted
301 * to it).
302 * @cbk: pointer to a callback function to be invoked upon completion
303 * of this request. This has the form:
304 * callback(struct device *dev, u32 *desc, u32 stat, void *arg)
305 * where:
306 * @dev: contains the job ring device that processed this
307 * response.
308 * @desc: descriptor that initiated the request, same as
309 * "desc" being argued to caam_jr_enqueue().
310 * @status: untranslated status received from CAAM. See the
311 * reference manual for a detailed description of
312 * error meaning, or see the JRSTA definitions in the
313 * register header file
314 * @areq: optional pointer to an argument passed with the
315 * original request
316 * @areq: optional pointer to a user argument for use at callback
317 * time.
318 **/
319 int caam_jr_enqueue(struct device *dev, u32 *desc,
320 void (*cbk)(struct device *dev, u32 *desc,
321 u32 status, void *areq),
322 void *areq)
323 {
324 struct caam_drv_private_jr *jrp = dev_get_drvdata(dev);
325 struct caam_jrentry_info *head_entry;
326 int head, tail, desc_size;
327 dma_addr_t desc_dma;
328
329 desc_size = (*desc & HDR_JD_LENGTH_MASK) * sizeof(u32);
330 desc_dma = dma_map_single(dev, desc, desc_size, DMA_TO_DEVICE);
331 if (dma_mapping_error(dev, desc_dma)) {
332 dev_err(dev, "caam_jr_enqueue(): can't map jobdesc\n");
333 return -EIO;
334 }
335
336 spin_lock_bh(&jrp->inplock);
337
338 head = jrp->head;
339 tail = ACCESS_ONCE(jrp->tail);
340
341 if (!rd_reg32(&jrp->rregs->inpring_avail) ||
342 CIRC_SPACE(head, tail, JOBR_DEPTH) <= 0) {
343 spin_unlock_bh(&jrp->inplock);
344 dma_unmap_single(dev, desc_dma, desc_size, DMA_TO_DEVICE);
345 return -EBUSY;
346 }
347
348 head_entry = &jrp->entinfo[head];
349 head_entry->desc_addr_virt = desc;
350 head_entry->desc_size = desc_size;
351 head_entry->callbk = (void *)cbk;
352 head_entry->cbkarg = areq;
353 head_entry->desc_addr_dma = desc_dma;
354
355 jrp->inpring[jrp->inp_ring_write_index] = desc_dma;
356
357 smp_wmb();
358
359 jrp->inp_ring_write_index = (jrp->inp_ring_write_index + 1) &
360 (JOBR_DEPTH - 1);
361 jrp->head = (head + 1) & (JOBR_DEPTH - 1);
362
363 wr_reg32(&jrp->rregs->inpring_jobadd, 1);
364
365 spin_unlock_bh(&jrp->inplock);
366
367 return 0;
368 }
369 EXPORT_SYMBOL(caam_jr_enqueue);
370
371 /*
372 * Init JobR independent of platform property detection
373 */
374 static int caam_jr_init(struct device *dev)
375 {
376 struct caam_drv_private_jr *jrp;
377 dma_addr_t inpbusaddr, outbusaddr;
378 int i, error;
379
380 jrp = dev_get_drvdata(dev);
381
382 tasklet_init(&jrp->irqtask, caam_jr_dequeue, (unsigned long)dev);
383
384 /* Connect job ring interrupt handler. */
385 error = request_irq(jrp->irq, caam_jr_interrupt, IRQF_SHARED,
386 dev_name(dev), dev);
387 if (error) {
388 dev_err(dev, "can't connect JobR %d interrupt (%d)\n",
389 jrp->ridx, jrp->irq);
390 irq_dispose_mapping(jrp->irq);
391 jrp->irq = 0;
392 return -EINVAL;
393 }
394
395 error = caam_reset_hw_jr(dev);
396 if (error)
397 return error;
398
399 jrp->inpring = dma_alloc_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH,
400 &inpbusaddr, GFP_KERNEL);
401
402 jrp->outring = dma_alloc_coherent(dev, sizeof(struct jr_outentry) *
403 JOBR_DEPTH, &outbusaddr, GFP_KERNEL);
404
405 jrp->entinfo = kzalloc(sizeof(struct caam_jrentry_info) * JOBR_DEPTH,
406 GFP_KERNEL);
407
408 if ((jrp->inpring == NULL) || (jrp->outring == NULL) ||
409 (jrp->entinfo == NULL)) {
410 dev_err(dev, "can't allocate job rings for %d\n",
411 jrp->ridx);
412 return -ENOMEM;
413 }
414
415 for (i = 0; i < JOBR_DEPTH; i++)
416 jrp->entinfo[i].desc_addr_dma = !0;
417
418 /* Setup rings */
419 jrp->inp_ring_write_index = 0;
420 jrp->out_ring_read_index = 0;
421 jrp->head = 0;
422 jrp->tail = 0;
423
424 wr_reg64(&jrp->rregs->inpring_base, inpbusaddr);
425 wr_reg64(&jrp->rregs->outring_base, outbusaddr);
426 wr_reg32(&jrp->rregs->inpring_size, JOBR_DEPTH);
427 wr_reg32(&jrp->rregs->outring_size, JOBR_DEPTH);
428
429 jrp->ringsize = JOBR_DEPTH;
430
431 spin_lock_init(&jrp->inplock);
432 spin_lock_init(&jrp->outlock);
433
434 /* Select interrupt coalescing parameters */
435 setbits32(&jrp->rregs->rconfig_lo, JOBR_INTC |
436 (JOBR_INTC_COUNT_THLD << JRCFG_ICDCT_SHIFT) |
437 (JOBR_INTC_TIME_THLD << JRCFG_ICTT_SHIFT));
438
439 return 0;
440 }
441
442
443 /*
444 * Probe routine for each detected JobR subsystem.
445 */
446 static int caam_jr_probe(struct platform_device *pdev)
447 {
448 struct device *jrdev;
449 struct device_node *nprop;
450 struct caam_job_ring __iomem *ctrl;
451 struct caam_drv_private_jr *jrpriv;
452 static int total_jobrs;
453 int error;
454
455 jrdev = &pdev->dev;
456 jrpriv = kmalloc(sizeof(struct caam_drv_private_jr),
457 GFP_KERNEL);
458 if (!jrpriv)
459 return -ENOMEM;
460
461 dev_set_drvdata(jrdev, jrpriv);
462
463 /* save ring identity relative to detection */
464 jrpriv->ridx = total_jobrs++;
465
466 nprop = pdev->dev.of_node;
467 /* Get configuration properties from device tree */
468 /* First, get register page */
469 ctrl = of_iomap(nprop, 0);
470 if (!ctrl) {
471 dev_err(jrdev, "of_iomap() failed\n");
472 return -ENOMEM;
473 }
474
475 jrpriv->rregs = (struct caam_job_ring __force *)ctrl;
476
477 if (sizeof(dma_addr_t) == sizeof(u64))
478 if (of_device_is_compatible(nprop, "fsl,sec-v5.0-job-ring"))
479 dma_set_mask(jrdev, DMA_BIT_MASK(40));
480 else
481 dma_set_mask(jrdev, DMA_BIT_MASK(36));
482 else
483 dma_set_mask(jrdev, DMA_BIT_MASK(32));
484
485 /* Identify the interrupt */
486 jrpriv->irq = irq_of_parse_and_map(nprop, 0);
487
488 /* Now do the platform independent part */
489 error = caam_jr_init(jrdev); /* now turn on hardware */
490 if (error) {
491 kfree(jrpriv);
492 return error;
493 }
494
495 jrpriv->dev = jrdev;
496 spin_lock(&driver_data.jr_alloc_lock);
497 list_add_tail(&jrpriv->list_node, &driver_data.jr_list);
498 spin_unlock(&driver_data.jr_alloc_lock);
499
500 atomic_set(&jrpriv->tfm_count, 0);
501
502 return 0;
503 }
504
505 static struct of_device_id caam_jr_match[] = {
506 {
507 .compatible = "fsl,sec-v4.0-job-ring",
508 },
509 {
510 .compatible = "fsl,sec4.0-job-ring",
511 },
512 {},
513 };
514 MODULE_DEVICE_TABLE(of, caam_jr_match);
515
516 static struct platform_driver caam_jr_driver = {
517 .driver = {
518 .name = "caam_jr",
519 .owner = THIS_MODULE,
520 .of_match_table = caam_jr_match,
521 },
522 .probe = caam_jr_probe,
523 .remove = caam_jr_remove,
524 };
525
526 static int __init jr_driver_init(void)
527 {
528 spin_lock_init(&driver_data.jr_alloc_lock);
529 INIT_LIST_HEAD(&driver_data.jr_list);
530 return platform_driver_register(&caam_jr_driver);
531 }
532
533 static void __exit jr_driver_exit(void)
534 {
535 platform_driver_unregister(&caam_jr_driver);
536 }
537
538 module_init(jr_driver_init);
539 module_exit(jr_driver_exit);
540
541 MODULE_LICENSE("GPL");
542 MODULE_DESCRIPTION("FSL CAAM JR request backend");
543 MODULE_AUTHOR("Freescale Semiconductor - NMG/STC");
Linux with added FPC-III support