xref: /openbmc/linux/drivers/crypto/caam/jr.c (revision e0bf6c5c)
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 		goto out_kill_deq;
388 	}
389 
390 	error = caam_reset_hw_jr(dev);
391 	if (error)
392 		goto out_free_irq;
393 
394 	error = -ENOMEM;
395 	jrp->inpring = dma_alloc_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH,
396 					  &inpbusaddr, GFP_KERNEL);
397 	if (!jrp->inpring)
398 		goto out_free_irq;
399 
400 	jrp->outring = dma_alloc_coherent(dev, sizeof(struct jr_outentry) *
401 					  JOBR_DEPTH, &outbusaddr, GFP_KERNEL);
402 	if (!jrp->outring)
403 		goto out_free_inpring;
404 
405 	jrp->entinfo = kzalloc(sizeof(struct caam_jrentry_info) * JOBR_DEPTH,
406 			       GFP_KERNEL);
407 	if (!jrp->entinfo)
408 		goto out_free_outring;
409 
410 	for (i = 0; i < JOBR_DEPTH; i++)
411 		jrp->entinfo[i].desc_addr_dma = !0;
412 
413 	/* Setup rings */
414 	jrp->inp_ring_write_index = 0;
415 	jrp->out_ring_read_index = 0;
416 	jrp->head = 0;
417 	jrp->tail = 0;
418 
419 	wr_reg64(&jrp->rregs->inpring_base, inpbusaddr);
420 	wr_reg64(&jrp->rregs->outring_base, outbusaddr);
421 	wr_reg32(&jrp->rregs->inpring_size, JOBR_DEPTH);
422 	wr_reg32(&jrp->rregs->outring_size, JOBR_DEPTH);
423 
424 	jrp->ringsize = JOBR_DEPTH;
425 
426 	spin_lock_init(&jrp->inplock);
427 	spin_lock_init(&jrp->outlock);
428 
429 	/* Select interrupt coalescing parameters */
430 	setbits32(&jrp->rregs->rconfig_lo, JOBR_INTC |
431 		  (JOBR_INTC_COUNT_THLD << JRCFG_ICDCT_SHIFT) |
432 		  (JOBR_INTC_TIME_THLD << JRCFG_ICTT_SHIFT));
433 
434 	return 0;
435 
436 out_free_outring:
437 	dma_free_coherent(dev, sizeof(struct jr_outentry) * JOBR_DEPTH,
438 			  jrp->outring, outbusaddr);
439 out_free_inpring:
440 	dma_free_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH,
441 			  jrp->inpring, inpbusaddr);
442 	dev_err(dev, "can't allocate job rings for %d\n", jrp->ridx);
443 out_free_irq:
444 	free_irq(jrp->irq, dev);
445 out_kill_deq:
446 	tasklet_kill(&jrp->irqtask);
447 	return error;
448 }
449 
450 
451 /*
452  * Probe routine for each detected JobR subsystem.
453  */
454 static int caam_jr_probe(struct platform_device *pdev)
455 {
456 	struct device *jrdev;
457 	struct device_node *nprop;
458 	struct caam_job_ring __iomem *ctrl;
459 	struct caam_drv_private_jr *jrpriv;
460 	static int total_jobrs;
461 	int error;
462 
463 	jrdev = &pdev->dev;
464 	jrpriv = devm_kmalloc(jrdev, sizeof(struct caam_drv_private_jr),
465 			      GFP_KERNEL);
466 	if (!jrpriv)
467 		return -ENOMEM;
468 
469 	dev_set_drvdata(jrdev, jrpriv);
470 
471 	/* save ring identity relative to detection */
472 	jrpriv->ridx = total_jobrs++;
473 
474 	nprop = pdev->dev.of_node;
475 	/* Get configuration properties from device tree */
476 	/* First, get register page */
477 	ctrl = of_iomap(nprop, 0);
478 	if (!ctrl) {
479 		dev_err(jrdev, "of_iomap() failed\n");
480 		return -ENOMEM;
481 	}
482 
483 	jrpriv->rregs = (struct caam_job_ring __force *)ctrl;
484 
485 	if (sizeof(dma_addr_t) == sizeof(u64))
486 		if (of_device_is_compatible(nprop, "fsl,sec-v5.0-job-ring"))
487 			dma_set_mask_and_coherent(jrdev, DMA_BIT_MASK(40));
488 		else
489 			dma_set_mask_and_coherent(jrdev, DMA_BIT_MASK(36));
490 	else
491 		dma_set_mask_and_coherent(jrdev, DMA_BIT_MASK(32));
492 
493 	/* Identify the interrupt */
494 	jrpriv->irq = irq_of_parse_and_map(nprop, 0);
495 
496 	/* Now do the platform independent part */
497 	error = caam_jr_init(jrdev); /* now turn on hardware */
498 	if (error) {
499 		irq_dispose_mapping(jrpriv->irq);
500 		return error;
501 	}
502 
503 	jrpriv->dev = jrdev;
504 	spin_lock(&driver_data.jr_alloc_lock);
505 	list_add_tail(&jrpriv->list_node, &driver_data.jr_list);
506 	spin_unlock(&driver_data.jr_alloc_lock);
507 
508 	atomic_set(&jrpriv->tfm_count, 0);
509 
510 	return 0;
511 }
512 
513 static struct of_device_id caam_jr_match[] = {
514 	{
515 		.compatible = "fsl,sec-v4.0-job-ring",
516 	},
517 	{
518 		.compatible = "fsl,sec4.0-job-ring",
519 	},
520 	{},
521 };
522 MODULE_DEVICE_TABLE(of, caam_jr_match);
523 
524 static struct platform_driver caam_jr_driver = {
525 	.driver = {
526 		.name = "caam_jr",
527 		.of_match_table = caam_jr_match,
528 	},
529 	.probe       = caam_jr_probe,
530 	.remove      = caam_jr_remove,
531 };
532 
533 static int __init jr_driver_init(void)
534 {
535 	spin_lock_init(&driver_data.jr_alloc_lock);
536 	INIT_LIST_HEAD(&driver_data.jr_list);
537 	return platform_driver_register(&caam_jr_driver);
538 }
539 
540 static void __exit jr_driver_exit(void)
541 {
542 	platform_driver_unregister(&caam_jr_driver);
543 }
544 
545 module_init(jr_driver_init);
546 module_exit(jr_driver_exit);
547 
548 MODULE_LICENSE("GPL");
549 MODULE_DESCRIPTION("FSL CAAM JR request backend");
550 MODULE_AUTHOR("Freescale Semiconductor - NMG/STC");
551