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ACPICA: Update version to 20080514
[linux-2.6/linux-2.6-openrd.git] / drivers / crypto / talitos.c
blobb11943dadefd7a23d85d29f5908451859e397497
1 /*
2 * talitos - Freescale Integrated Security Engine (SEC) device driver
3 *
4 * Copyright (c) 2008 Freescale Semiconductor, Inc.
5 *
6 * Scatterlist Crypto API glue code copied from files with the following:
7 * Copyright (c) 2006-2007 Herbert Xu <herbert@gondor.apana.org.au>
8 *
9 * Crypto algorithm registration code copied from hifn driver:
10 * 2007+ Copyright (c) Evgeniy Polyakov <johnpol@2ka.mipt.ru>
11 * All rights reserved.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 */
27
28 #include <linux/kernel.h>
29 #include <linux/module.h>
30 #include <linux/mod_devicetable.h>
31 #include <linux/device.h>
32 #include <linux/interrupt.h>
33 #include <linux/crypto.h>
34 #include <linux/hw_random.h>
35 #include <linux/of_platform.h>
36 #include <linux/dma-mapping.h>
37 #include <linux/io.h>
38 #include <linux/spinlock.h>
39 #include <linux/rtnetlink.h>
40
41 #include <crypto/algapi.h>
42 #include <crypto/aes.h>
43 #include <crypto/des.h>
44 #include <crypto/sha.h>
45 #include <crypto/aead.h>
46 #include <crypto/authenc.h>
47
48 #include "talitos.h"
49
50 #define TALITOS_TIMEOUT 100000
51 #define TALITOS_MAX_DATA_LEN 65535
52
53 #define DESC_TYPE(desc_hdr) ((be32_to_cpu(desc_hdr) >> 3) & 0x1f)
54 #define PRIMARY_EU(desc_hdr) ((be32_to_cpu(desc_hdr) >> 28) & 0xf)
55 #define SECONDARY_EU(desc_hdr) ((be32_to_cpu(desc_hdr) >> 16) & 0xf)
56
57 /* descriptor pointer entry */
58 struct talitos_ptr {
59 __be16 len; /* length */
60 u8 j_extent; /* jump to sg link table and/or extent */
61 u8 eptr; /* extended address */
62 __be32 ptr; /* address */
63 };
64
65 /* descriptor */
66 struct talitos_desc {
67 __be32 hdr; /* header high bits */
68 __be32 hdr_lo; /* header low bits */
69 struct talitos_ptr ptr[7]; /* ptr/len pair array */
70 };
71
72 /**
73 * talitos_request - descriptor submission request
74 * @desc: descriptor pointer (kernel virtual)
75 * @dma_desc: descriptor's physical bus address
76 * @callback: whom to call when descriptor processing is done
77 * @context: caller context (optional)
78 */
79 struct talitos_request {
80 struct talitos_desc *desc;
81 dma_addr_t dma_desc;
82 void (*callback) (struct device *dev, struct talitos_desc *desc,
83 void *context, int error);
84 void *context;
85 };
86
87 struct talitos_private {
88 struct device *dev;
89 struct of_device *ofdev;
90 void __iomem *reg;
91 int irq;
92
93 /* SEC version geometry (from device tree node) */
94 unsigned int num_channels;
95 unsigned int chfifo_len;
96 unsigned int exec_units;
97 unsigned int desc_types;
98
99 /* next channel to be assigned next incoming descriptor */
100 atomic_t last_chan;
101
102 /* per-channel request fifo */
103 struct talitos_request **fifo;
104
105 /*
106 * length of the request fifo
107 * fifo_len is chfifo_len rounded up to next power of 2
108 * so we can use bitwise ops to wrap
109 */
110 unsigned int fifo_len;
111
112 /* per-channel index to next free descriptor request */
113 int *head;
114
115 /* per-channel index to next in-progress/done descriptor request */
116 int *tail;
117
118 /* per-channel request submission (head) and release (tail) locks */
119 spinlock_t *head_lock;
120 spinlock_t *tail_lock;
121
122 /* request callback tasklet */
123 struct tasklet_struct done_task;
124 struct tasklet_struct error_task;
125
126 /* list of registered algorithms */
127 struct list_head alg_list;
128
129 /* hwrng device */
130 struct hwrng rng;
131 };
132
133 /*
134 * map virtual single (contiguous) pointer to h/w descriptor pointer
135 */
136 static void map_single_talitos_ptr(struct device *dev,
137 struct talitos_ptr *talitos_ptr,
138 unsigned short len, void *data,
139 unsigned char extent,
140 enum dma_data_direction dir)
141 {
142 talitos_ptr->len = cpu_to_be16(len);
143 talitos_ptr->ptr = cpu_to_be32(dma_map_single(dev, data, len, dir));
144 talitos_ptr->j_extent = extent;
145 }
146
147 /*
148 * unmap bus single (contiguous) h/w descriptor pointer
149 */
150 static void unmap_single_talitos_ptr(struct device *dev,
151 struct talitos_ptr *talitos_ptr,
152 enum dma_data_direction dir)
153 {
154 dma_unmap_single(dev, be32_to_cpu(talitos_ptr->ptr),
155 be16_to_cpu(talitos_ptr->len), dir);
156 }
157
158 static int reset_channel(struct device *dev, int ch)
159 {
160 struct talitos_private *priv = dev_get_drvdata(dev);
161 unsigned int timeout = TALITOS_TIMEOUT;
162
163 setbits32(priv->reg + TALITOS_CCCR(ch), TALITOS_CCCR_RESET);
164
165 while ((in_be32(priv->reg + TALITOS_CCCR(ch)) & TALITOS_CCCR_RESET)
166 && --timeout)
167 cpu_relax();
168
169 if (timeout == 0) {
170 dev_err(dev, "failed to reset channel %d\n", ch);
171 return -EIO;
172 }
173
174 /* set done writeback and IRQ */
175 setbits32(priv->reg + TALITOS_CCCR_LO(ch), TALITOS_CCCR_LO_CDWE |
176 TALITOS_CCCR_LO_CDIE);
177
178 return 0;
179 }
180
181 static int reset_device(struct device *dev)
182 {
183 struct talitos_private *priv = dev_get_drvdata(dev);
184 unsigned int timeout = TALITOS_TIMEOUT;
185
186 setbits32(priv->reg + TALITOS_MCR, TALITOS_MCR_SWR);
187
188 while ((in_be32(priv->reg + TALITOS_MCR) & TALITOS_MCR_SWR)
189 && --timeout)
190 cpu_relax();
191
192 if (timeout == 0) {
193 dev_err(dev, "failed to reset device\n");
194 return -EIO;
195 }
196
197 return 0;
198 }
199
200 /*
201 * Reset and initialize the device
202 */
203 static int init_device(struct device *dev)
204 {
205 struct talitos_private *priv = dev_get_drvdata(dev);
206 int ch, err;
207
208 /*
209 * Master reset
210 * errata documentation: warning: certain SEC interrupts
211 * are not fully cleared by writing the MCR:SWR bit,
212 * set bit twice to completely reset
213 */
214 err = reset_device(dev);
215 if (err)
216 return err;
217
218 err = reset_device(dev);
219 if (err)
220 return err;
221
222 /* reset channels */
223 for (ch = 0; ch < priv->num_channels; ch++) {
224 err = reset_channel(dev, ch);
225 if (err)
226 return err;
227 }
228
229 /* enable channel done and error interrupts */
230 setbits32(priv->reg + TALITOS_IMR, TALITOS_IMR_INIT);
231 setbits32(priv->reg + TALITOS_IMR_LO, TALITOS_IMR_LO_INIT);
232
233 return 0;
234 }
235
236 /**
237 * talitos_submit - submits a descriptor to the device for processing
238 * @dev: the SEC device to be used
239 * @desc: the descriptor to be processed by the device
240 * @callback: whom to call when processing is complete
241 * @context: a handle for use by caller (optional)
242 *
243 * desc must contain valid dma-mapped (bus physical) address pointers.
244 * callback must check err and feedback in descriptor header
245 * for device processing status.
246 */
247 static int talitos_submit(struct device *dev, struct talitos_desc *desc,
248 void (*callback)(struct device *dev,
249 struct talitos_desc *desc,
250 void *context, int error),
251 void *context)
252 {
253 struct talitos_private *priv = dev_get_drvdata(dev);
254 struct talitos_request *request;
255 unsigned long flags, ch;
256 int head;
257
258 /* select done notification */
259 desc->hdr |= DESC_HDR_DONE_NOTIFY;
260
261 /* emulate SEC's round-robin channel fifo polling scheme */
262 ch = atomic_inc_return(&priv->last_chan) & (priv->num_channels - 1);
263
264 spin_lock_irqsave(&priv->head_lock[ch], flags);
265
266 head = priv->head[ch];
267 request = &priv->fifo[ch][head];
268
269 if (request->desc) {
270 /* request queue is full */
271 spin_unlock_irqrestore(&priv->head_lock[ch], flags);
272 return -EAGAIN;
273 }
274
275 /* map descriptor and save caller data */
276 request->dma_desc = dma_map_single(dev, desc, sizeof(*desc),
277 DMA_BIDIRECTIONAL);
278 request->callback = callback;
279 request->context = context;
280
281 /* increment fifo head */
282 priv->head[ch] = (priv->head[ch] + 1) & (priv->fifo_len - 1);
283
284 smp_wmb();
285 request->desc = desc;
286
287 /* GO! */
288 wmb();
289 out_be32(priv->reg + TALITOS_FF_LO(ch), request->dma_desc);
290
291 spin_unlock_irqrestore(&priv->head_lock[ch], flags);
292
293 return -EINPROGRESS;
294 }
295
296 /*
297 * process what was done, notify callback of error if not
298 */
299 static void flush_channel(struct device *dev, int ch, int error, int reset_ch)
300 {
301 struct talitos_private *priv = dev_get_drvdata(dev);
302 struct talitos_request *request, saved_req;
303 unsigned long flags;
304 int tail, status;
305
306 spin_lock_irqsave(&priv->tail_lock[ch], flags);
307
308 tail = priv->tail[ch];
309 while (priv->fifo[ch][tail].desc) {
310 request = &priv->fifo[ch][tail];
311
312 /* descriptors with their done bits set don't get the error */
313 rmb();
314 if ((request->desc->hdr & DESC_HDR_DONE) == DESC_HDR_DONE)
315 status = 0;
316 else
317 if (!error)
318 break;
319 else
320 status = error;
321
322 dma_unmap_single(dev, request->dma_desc,
323 sizeof(struct talitos_desc), DMA_BIDIRECTIONAL);
324
325 /* copy entries so we can call callback outside lock */
326 saved_req.desc = request->desc;
327 saved_req.callback = request->callback;
328 saved_req.context = request->context;
329
330 /* release request entry in fifo */
331 smp_wmb();
332 request->desc = NULL;
333
334 /* increment fifo tail */
335 priv->tail[ch] = (tail + 1) & (priv->fifo_len - 1);
336
337 spin_unlock_irqrestore(&priv->tail_lock[ch], flags);
338 saved_req.callback(dev, saved_req.desc, saved_req.context,
339 status);
340 /* channel may resume processing in single desc error case */
341 if (error && !reset_ch && status == error)
342 return;
343 spin_lock_irqsave(&priv->tail_lock[ch], flags);
344 tail = priv->tail[ch];
345 }
346
347 spin_unlock_irqrestore(&priv->tail_lock[ch], flags);
348 }
349
350 /*
351 * process completed requests for channels that have done status
352 */
353 static void talitos_done(unsigned long data)
354 {
355 struct device *dev = (struct device *)data;
356 struct talitos_private *priv = dev_get_drvdata(dev);
357 int ch;
358
359 for (ch = 0; ch < priv->num_channels; ch++)
360 flush_channel(dev, ch, 0, 0);
361 }
362
363 /*
364 * locate current (offending) descriptor
365 */
366 static struct talitos_desc *current_desc(struct device *dev, int ch)
367 {
368 struct talitos_private *priv = dev_get_drvdata(dev);
369 int tail = priv->tail[ch];
370 dma_addr_t cur_desc;
371
372 cur_desc = in_be32(priv->reg + TALITOS_CDPR_LO(ch));
373
374 while (priv->fifo[ch][tail].dma_desc != cur_desc) {
375 tail = (tail + 1) & (priv->fifo_len - 1);
376 if (tail == priv->tail[ch]) {
377 dev_err(dev, "couldn't locate current descriptor\n");
378 return NULL;
379 }
380 }
381
382 return priv->fifo[ch][tail].desc;
383 }
384
385 /*
386 * user diagnostics; report root cause of error based on execution unit status
387 */
388 static void report_eu_error(struct device *dev, int ch, struct talitos_desc *desc)
389 {
390 struct talitos_private *priv = dev_get_drvdata(dev);
391 int i;
392
393 switch (desc->hdr & DESC_HDR_SEL0_MASK) {
394 case DESC_HDR_SEL0_AFEU:
395 dev_err(dev, "AFEUISR 0x%08x_%08x\n",
396 in_be32(priv->reg + TALITOS_AFEUISR),
397 in_be32(priv->reg + TALITOS_AFEUISR_LO));
398 break;
399 case DESC_HDR_SEL0_DEU:
400 dev_err(dev, "DEUISR 0x%08x_%08x\n",
401 in_be32(priv->reg + TALITOS_DEUISR),
402 in_be32(priv->reg + TALITOS_DEUISR_LO));
403 break;
404 case DESC_HDR_SEL0_MDEUA:
405 case DESC_HDR_SEL0_MDEUB:
406 dev_err(dev, "MDEUISR 0x%08x_%08x\n",
407 in_be32(priv->reg + TALITOS_MDEUISR),
408 in_be32(priv->reg + TALITOS_MDEUISR_LO));
409 break;
410 case DESC_HDR_SEL0_RNG:
411 dev_err(dev, "RNGUISR 0x%08x_%08x\n",
412 in_be32(priv->reg + TALITOS_RNGUISR),
413 in_be32(priv->reg + TALITOS_RNGUISR_LO));
414 break;
415 case DESC_HDR_SEL0_PKEU:
416 dev_err(dev, "PKEUISR 0x%08x_%08x\n",
417 in_be32(priv->reg + TALITOS_PKEUISR),
418 in_be32(priv->reg + TALITOS_PKEUISR_LO));
419 break;
420 case DESC_HDR_SEL0_AESU:
421 dev_err(dev, "AESUISR 0x%08x_%08x\n",
422 in_be32(priv->reg + TALITOS_AESUISR),
423 in_be32(priv->reg + TALITOS_AESUISR_LO));
424 break;
425 case DESC_HDR_SEL0_CRCU:
426 dev_err(dev, "CRCUISR 0x%08x_%08x\n",
427 in_be32(priv->reg + TALITOS_CRCUISR),
428 in_be32(priv->reg + TALITOS_CRCUISR_LO));
429 break;
430 case DESC_HDR_SEL0_KEU:
431 dev_err(dev, "KEUISR 0x%08x_%08x\n",
432 in_be32(priv->reg + TALITOS_KEUISR),
433 in_be32(priv->reg + TALITOS_KEUISR_LO));
434 break;
435 }
436
437 switch (desc->hdr & DESC_HDR_SEL1_MASK) {
438 case DESC_HDR_SEL1_MDEUA:
439 case DESC_HDR_SEL1_MDEUB:
440 dev_err(dev, "MDEUISR 0x%08x_%08x\n",
441 in_be32(priv->reg + TALITOS_MDEUISR),
442 in_be32(priv->reg + TALITOS_MDEUISR_LO));
443 break;
444 case DESC_HDR_SEL1_CRCU:
445 dev_err(dev, "CRCUISR 0x%08x_%08x\n",
446 in_be32(priv->reg + TALITOS_CRCUISR),
447 in_be32(priv->reg + TALITOS_CRCUISR_LO));
448 break;
449 }
450
451 for (i = 0; i < 8; i++)
452 dev_err(dev, "DESCBUF 0x%08x_%08x\n",
453 in_be32(priv->reg + TALITOS_DESCBUF(ch) + 8*i),
454 in_be32(priv->reg + TALITOS_DESCBUF_LO(ch) + 8*i));
455 }
456
457 /*
458 * recover from error interrupts
459 */
460 static void talitos_error(unsigned long data)
461 {
462 struct device *dev = (struct device *)data;
463 struct talitos_private *priv = dev_get_drvdata(dev);
464 unsigned int timeout = TALITOS_TIMEOUT;
465 int ch, error, reset_dev = 0, reset_ch = 0;
466 u32 isr, isr_lo, v, v_lo;
467
468 isr = in_be32(priv->reg + TALITOS_ISR);
469 isr_lo = in_be32(priv->reg + TALITOS_ISR_LO);
470
471 for (ch = 0; ch < priv->num_channels; ch++) {
472 /* skip channels without errors */
473 if (!(isr & (1 << (ch * 2 + 1))))
474 continue;
475
476 error = -EINVAL;
477
478 v = in_be32(priv->reg + TALITOS_CCPSR(ch));
479 v_lo = in_be32(priv->reg + TALITOS_CCPSR_LO(ch));
480
481 if (v_lo & TALITOS_CCPSR_LO_DOF) {
482 dev_err(dev, "double fetch fifo overflow error\n");
483 error = -EAGAIN;
484 reset_ch = 1;
485 }
486 if (v_lo & TALITOS_CCPSR_LO_SOF) {
487 /* h/w dropped descriptor */
488 dev_err(dev, "single fetch fifo overflow error\n");
489 error = -EAGAIN;
490 }
491 if (v_lo & TALITOS_CCPSR_LO_MDTE)
492 dev_err(dev, "master data transfer error\n");
493 if (v_lo & TALITOS_CCPSR_LO_SGDLZ)
494 dev_err(dev, "s/g data length zero error\n");
495 if (v_lo & TALITOS_CCPSR_LO_FPZ)
496 dev_err(dev, "fetch pointer zero error\n");
497 if (v_lo & TALITOS_CCPSR_LO_IDH)
498 dev_err(dev, "illegal descriptor header error\n");
499 if (v_lo & TALITOS_CCPSR_LO_IEU)
500 dev_err(dev, "invalid execution unit error\n");
501 if (v_lo & TALITOS_CCPSR_LO_EU)
502 report_eu_error(dev, ch, current_desc(dev, ch));
503 if (v_lo & TALITOS_CCPSR_LO_GB)
504 dev_err(dev, "gather boundary error\n");
505 if (v_lo & TALITOS_CCPSR_LO_GRL)
506 dev_err(dev, "gather return/length error\n");
507 if (v_lo & TALITOS_CCPSR_LO_SB)
508 dev_err(dev, "scatter boundary error\n");
509 if (v_lo & TALITOS_CCPSR_LO_SRL)
510 dev_err(dev, "scatter return/length error\n");
511
512 flush_channel(dev, ch, error, reset_ch);
513
514 if (reset_ch) {
515 reset_channel(dev, ch);
516 } else {
517 setbits32(priv->reg + TALITOS_CCCR(ch),
518 TALITOS_CCCR_CONT);
519 setbits32(priv->reg + TALITOS_CCCR_LO(ch), 0);
520 while ((in_be32(priv->reg + TALITOS_CCCR(ch)) &
521 TALITOS_CCCR_CONT) && --timeout)
522 cpu_relax();
523 if (timeout == 0) {
524 dev_err(dev, "failed to restart channel %d\n",
525 ch);
526 reset_dev = 1;
527 }
528 }
529 }
530 if (reset_dev || isr & ~TALITOS_ISR_CHERR || isr_lo) {
531 dev_err(dev, "done overflow, internal time out, or rngu error: "
532 "ISR 0x%08x_%08x\n", isr, isr_lo);
533
534 /* purge request queues */
535 for (ch = 0; ch < priv->num_channels; ch++)
536 flush_channel(dev, ch, -EIO, 1);
537
538 /* reset and reinitialize the device */
539 init_device(dev);
540 }
541 }
542
543 static irqreturn_t talitos_interrupt(int irq, void *data)
544 {
545 struct device *dev = data;
546 struct talitos_private *priv = dev_get_drvdata(dev);
547 u32 isr, isr_lo;
548
549 isr = in_be32(priv->reg + TALITOS_ISR);
550 isr_lo = in_be32(priv->reg + TALITOS_ISR_LO);
551
552 /* ack */
553 out_be32(priv->reg + TALITOS_ICR, isr);
554 out_be32(priv->reg + TALITOS_ICR_LO, isr_lo);
555
556 if (unlikely((isr & ~TALITOS_ISR_CHDONE) || isr_lo))
557 talitos_error((unsigned long)data);
558 else
559 if (likely(isr & TALITOS_ISR_CHDONE))
560 tasklet_schedule(&priv->done_task);
561
562 return (isr || isr_lo) ? IRQ_HANDLED : IRQ_NONE;
563 }
564
565 /*
566 * hwrng
567 */
568 static int talitos_rng_data_present(struct hwrng *rng, int wait)
569 {
570 struct device *dev = (struct device *)rng->priv;
571 struct talitos_private *priv = dev_get_drvdata(dev);
572 u32 ofl;
573 int i;
574
575 for (i = 0; i < 20; i++) {
576 ofl = in_be32(priv->reg + TALITOS_RNGUSR_LO) &
577 TALITOS_RNGUSR_LO_OFL;
578 if (ofl || !wait)
579 break;
580 udelay(10);
581 }
582
583 return !!ofl;
584 }
585
586 static int talitos_rng_data_read(struct hwrng *rng, u32 *data)
587 {
588 struct device *dev = (struct device *)rng->priv;
589 struct talitos_private *priv = dev_get_drvdata(dev);
590
591 /* rng fifo requires 64-bit accesses */
592 *data = in_be32(priv->reg + TALITOS_RNGU_FIFO);
593 *data = in_be32(priv->reg + TALITOS_RNGU_FIFO_LO);
594
595 return sizeof(u32);
596 }
597
598 static int talitos_rng_init(struct hwrng *rng)
599 {
600 struct device *dev = (struct device *)rng->priv;
601 struct talitos_private *priv = dev_get_drvdata(dev);
602 unsigned int timeout = TALITOS_TIMEOUT;
603
604 setbits32(priv->reg + TALITOS_RNGURCR_LO, TALITOS_RNGURCR_LO_SR);
605 while (!(in_be32(priv->reg + TALITOS_RNGUSR_LO) & TALITOS_RNGUSR_LO_RD)
606 && --timeout)
607 cpu_relax();
608 if (timeout == 0) {
609 dev_err(dev, "failed to reset rng hw\n");
610 return -ENODEV;
611 }
612
613 /* start generating */
614 setbits32(priv->reg + TALITOS_RNGUDSR_LO, 0);
615
616 return 0;
617 }
618
619 static int talitos_register_rng(struct device *dev)
620 {
621 struct talitos_private *priv = dev_get_drvdata(dev);
622
623 priv->rng.name = dev_driver_string(dev),
624 priv->rng.init = talitos_rng_init,
625 priv->rng.data_present = talitos_rng_data_present,
626 priv->rng.data_read = talitos_rng_data_read,
627 priv->rng.priv = (unsigned long)dev;
628
629 return hwrng_register(&priv->rng);
630 }
631
632 static void talitos_unregister_rng(struct device *dev)
633 {
634 struct talitos_private *priv = dev_get_drvdata(dev);
635
636 hwrng_unregister(&priv->rng);
637 }
638
639 /*
640 * crypto alg
641 */
642 #define TALITOS_CRA_PRIORITY 3000
643 #define TALITOS_MAX_KEY_SIZE 64
644 #define TALITOS_MAX_IV_LENGTH 16 /* max of AES_BLOCK_SIZE, DES3_EDE_BLOCK_SIZE */
645
646 #define MD5_DIGEST_SIZE 16
647
648 struct talitos_ctx {
649 struct device *dev;
650 __be32 desc_hdr_template;
651 u8 key[TALITOS_MAX_KEY_SIZE];
652 u8 iv[TALITOS_MAX_IV_LENGTH];
653 unsigned int keylen;
654 unsigned int enckeylen;
655 unsigned int authkeylen;
656 unsigned int authsize;
657 };
658
659 static int aead_authenc_setauthsize(struct crypto_aead *authenc,
660 unsigned int authsize)
661 {
662 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
663
664 ctx->authsize = authsize;
665
666 return 0;
667 }
668
669 static int aead_authenc_setkey(struct crypto_aead *authenc,
670 const u8 *key, unsigned int keylen)
671 {
672 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
673 struct rtattr *rta = (void *)key;
674 struct crypto_authenc_key_param *param;
675 unsigned int authkeylen;
676 unsigned int enckeylen;
677
678 if (!RTA_OK(rta, keylen))
679 goto badkey;
680
681 if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
682 goto badkey;
683
684 if (RTA_PAYLOAD(rta) < sizeof(*param))
685 goto badkey;
686
687 param = RTA_DATA(rta);
688 enckeylen = be32_to_cpu(param->enckeylen);
689
690 key += RTA_ALIGN(rta->rta_len);
691 keylen -= RTA_ALIGN(rta->rta_len);
692
693 if (keylen < enckeylen)
694 goto badkey;
695
696 authkeylen = keylen - enckeylen;
697
698 if (keylen > TALITOS_MAX_KEY_SIZE)
699 goto badkey;
700
701 memcpy(&ctx->key, key, keylen);
702
703 ctx->keylen = keylen;
704 ctx->enckeylen = enckeylen;
705 ctx->authkeylen = authkeylen;
706
707 return 0;
708
709 badkey:
710 crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
711 return -EINVAL;
712 }
713
714 /*
715 * ipsec_esp_edesc - s/w-extended ipsec_esp descriptor
716 * @src_nents: number of segments in input scatterlist
717 * @dst_nents: number of segments in output scatterlist
718 * @dma_len: length of dma mapped link_tbl space
719 * @dma_link_tbl: bus physical address of link_tbl
720 * @desc: h/w descriptor
721 * @link_tbl: input and output h/w link tables (if {src,dst}_nents > 1)
722 *
723 * if decrypting (with authcheck), or either one of src_nents or dst_nents
724 * is greater than 1, an integrity check value is concatenated to the end
725 * of link_tbl data
726 */
727 struct ipsec_esp_edesc {
728 int src_nents;
729 int dst_nents;
730 int dma_len;
731 dma_addr_t dma_link_tbl;
732 struct talitos_desc desc;
733 struct talitos_ptr link_tbl[0];
734 };
735
736 static void ipsec_esp_unmap(struct device *dev,
737 struct ipsec_esp_edesc *edesc,
738 struct aead_request *areq)
739 {
740 unmap_single_talitos_ptr(dev, &edesc->desc.ptr[6], DMA_FROM_DEVICE);
741 unmap_single_talitos_ptr(dev, &edesc->desc.ptr[3], DMA_TO_DEVICE);
742 unmap_single_talitos_ptr(dev, &edesc->desc.ptr[2], DMA_TO_DEVICE);
743 unmap_single_talitos_ptr(dev, &edesc->desc.ptr[0], DMA_TO_DEVICE);
744
745 dma_unmap_sg(dev, areq->assoc, 1, DMA_TO_DEVICE);
746
747 if (areq->src != areq->dst) {
748 dma_unmap_sg(dev, areq->src, edesc->src_nents ? : 1,
749 DMA_TO_DEVICE);
750 dma_unmap_sg(dev, areq->dst, edesc->dst_nents ? : 1,
751 DMA_FROM_DEVICE);
752 } else {
753 dma_unmap_sg(dev, areq->src, edesc->src_nents ? : 1,
754 DMA_BIDIRECTIONAL);
755 }
756
757 if (edesc->dma_len)
758 dma_unmap_single(dev, edesc->dma_link_tbl, edesc->dma_len,
759 DMA_BIDIRECTIONAL);
760 }
761
762 /*
763 * ipsec_esp descriptor callbacks
764 */
765 static void ipsec_esp_encrypt_done(struct device *dev,
766 struct talitos_desc *desc, void *context,
767 int err)
768 {
769 struct aead_request *areq = context;
770 struct ipsec_esp_edesc *edesc =
771 container_of(desc, struct ipsec_esp_edesc, desc);
772 struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
773 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
774 struct scatterlist *sg;
775 void *icvdata;
776
777 ipsec_esp_unmap(dev, edesc, areq);
778
779 /* copy the generated ICV to dst */
780 if (edesc->dma_len) {
781 icvdata = &edesc->link_tbl[edesc->src_nents +
782 edesc->dst_nents + 1];
783 sg = sg_last(areq->dst, edesc->dst_nents);
784 memcpy((char *)sg_virt(sg) + sg->length - ctx->authsize,
785 icvdata, ctx->authsize);
786 }
787
788 kfree(edesc);
789
790 aead_request_complete(areq, err);
791 }
792
793 static void ipsec_esp_decrypt_done(struct device *dev,
794 struct talitos_desc *desc, void *context,
795 int err)
796 {
797 struct aead_request *req = context;
798 struct ipsec_esp_edesc *edesc =
799 container_of(desc, struct ipsec_esp_edesc, desc);
800 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
801 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
802 struct scatterlist *sg;
803 void *icvdata;
804
805 ipsec_esp_unmap(dev, edesc, req);
806
807 if (!err) {
808 /* auth check */
809 if (edesc->dma_len)
810 icvdata = &edesc->link_tbl[edesc->src_nents +
811 edesc->dst_nents + 1];
812 else
813 icvdata = &edesc->link_tbl[0];
814
815 sg = sg_last(req->dst, edesc->dst_nents ? : 1);
816 err = memcmp(icvdata, (char *)sg_virt(sg) + sg->length -
817 ctx->authsize, ctx->authsize) ? -EBADMSG : 0;
818 }
819
820 kfree(edesc);
821
822 aead_request_complete(req, err);
823 }
824
825 /*
826 * convert scatterlist to SEC h/w link table format
827 * stop at cryptlen bytes
828 */
829 static int sg_to_link_tbl(struct scatterlist *sg, int sg_count,
830 int cryptlen, struct talitos_ptr *link_tbl_ptr)
831 {
832 int n_sg = sg_count;
833
834 while (n_sg--) {
835 link_tbl_ptr->ptr = cpu_to_be32(sg_dma_address(sg));
836 link_tbl_ptr->len = cpu_to_be16(sg_dma_len(sg));
837 link_tbl_ptr->j_extent = 0;
838 link_tbl_ptr++;
839 cryptlen -= sg_dma_len(sg);
840 sg = sg_next(sg);
841 }
842
843 /* adjust (decrease) last one (or two) entry's len to cryptlen */
844 link_tbl_ptr--;
845 while (link_tbl_ptr->len <= (-cryptlen)) {
846 /* Empty this entry, and move to previous one */
847 cryptlen += be16_to_cpu(link_tbl_ptr->len);
848 link_tbl_ptr->len = 0;
849 sg_count--;
850 link_tbl_ptr--;
851 }
852 link_tbl_ptr->len = cpu_to_be16(be16_to_cpu(link_tbl_ptr->len)
853 + cryptlen);
854
855 /* tag end of link table */
856 link_tbl_ptr->j_extent = DESC_PTR_LNKTBL_RETURN;
857
858 return sg_count;
859 }
860
861 /*
862 * fill in and submit ipsec_esp descriptor
863 */
864 static int ipsec_esp(struct ipsec_esp_edesc *edesc, struct aead_request *areq,
865 u8 *giv, u64 seq,
866 void (*callback) (struct device *dev,
867 struct talitos_desc *desc,
868 void *context, int error))
869 {
870 struct crypto_aead *aead = crypto_aead_reqtfm(areq);
871 struct talitos_ctx *ctx = crypto_aead_ctx(aead);
872 struct device *dev = ctx->dev;
873 struct talitos_desc *desc = &edesc->desc;
874 unsigned int cryptlen = areq->cryptlen;
875 unsigned int authsize = ctx->authsize;
876 unsigned int ivsize;
877 int sg_count;
878
879 /* hmac key */
880 map_single_talitos_ptr(dev, &desc->ptr[0], ctx->authkeylen, &ctx->key,
881 0, DMA_TO_DEVICE);
882 /* hmac data */
883 map_single_talitos_ptr(dev, &desc->ptr[1], sg_virt(areq->src) -
884 sg_virt(areq->assoc), sg_virt(areq->assoc), 0,
885 DMA_TO_DEVICE);
886 /* cipher iv */
887 ivsize = crypto_aead_ivsize(aead);
888 map_single_talitos_ptr(dev, &desc->ptr[2], ivsize, giv ?: areq->iv, 0,
889 DMA_TO_DEVICE);
890
891 /* cipher key */
892 map_single_talitos_ptr(dev, &desc->ptr[3], ctx->enckeylen,
893 (char *)&ctx->key + ctx->authkeylen, 0,
894 DMA_TO_DEVICE);
895
896 /*
897 * cipher in
898 * map and adjust cipher len to aead request cryptlen.
899 * extent is bytes of HMAC postpended to ciphertext,
900 * typically 12 for ipsec
901 */
902 desc->ptr[4].len = cpu_to_be16(cryptlen);
903 desc->ptr[4].j_extent = authsize;
904
905 if (areq->src == areq->dst)
906 sg_count = dma_map_sg(dev, areq->src, edesc->src_nents ? : 1,
907 DMA_BIDIRECTIONAL);
908 else
909 sg_count = dma_map_sg(dev, areq->src, edesc->src_nents ? : 1,
910 DMA_TO_DEVICE);
911
912 if (sg_count == 1) {
913 desc->ptr[4].ptr = cpu_to_be32(sg_dma_address(areq->src));
914 } else {
915 sg_count = sg_to_link_tbl(areq->src, sg_count, cryptlen,
916 &edesc->link_tbl[0]);
917 if (sg_count > 1) {
918 desc->ptr[4].j_extent |= DESC_PTR_LNKTBL_JUMP;
919 desc->ptr[4].ptr = cpu_to_be32(edesc->dma_link_tbl);
920 dma_sync_single_for_device(ctx->dev, edesc->dma_link_tbl,
921 edesc->dma_len, DMA_BIDIRECTIONAL);
922 } else {
923 /* Only one segment now, so no link tbl needed */
924 desc->ptr[4].ptr = cpu_to_be32(sg_dma_address(areq->src));
925 }
926 }
927
928 /* cipher out */
929 desc->ptr[5].len = cpu_to_be16(cryptlen);
930 desc->ptr[5].j_extent = authsize;
931
932 if (areq->src != areq->dst) {
933 sg_count = dma_map_sg(dev, areq->dst, edesc->dst_nents ? : 1,
934 DMA_FROM_DEVICE);
935 }
936
937 if (sg_count == 1) {
938 desc->ptr[5].ptr = cpu_to_be32(sg_dma_address(areq->dst));
939 } else {
940 struct talitos_ptr *link_tbl_ptr =
941 &edesc->link_tbl[edesc->src_nents];
942 struct scatterlist *sg;
943
944 desc->ptr[5].ptr = cpu_to_be32((struct talitos_ptr *)
945 edesc->dma_link_tbl +
946 edesc->src_nents);
947 if (areq->src == areq->dst) {
948 memcpy(link_tbl_ptr, &edesc->link_tbl[0],
949 edesc->src_nents * sizeof(struct talitos_ptr));
950 } else {
951 sg_count = sg_to_link_tbl(areq->dst, sg_count, cryptlen,
952 link_tbl_ptr);
953 }
954 link_tbl_ptr += sg_count - 1;
955
956 /* handle case where sg_last contains the ICV exclusively */
957 sg = sg_last(areq->dst, edesc->dst_nents);
958 if (sg->length == ctx->authsize)
959 link_tbl_ptr--;
960
961 link_tbl_ptr->j_extent = 0;
962 link_tbl_ptr++;
963 link_tbl_ptr->j_extent = DESC_PTR_LNKTBL_RETURN;
964 link_tbl_ptr->len = cpu_to_be16(authsize);
965
966 /* icv data follows link tables */
967 link_tbl_ptr->ptr = cpu_to_be32((struct talitos_ptr *)
968 edesc->dma_link_tbl +
969 edesc->src_nents +
970 edesc->dst_nents + 1);
971
972 desc->ptr[5].j_extent |= DESC_PTR_LNKTBL_JUMP;
973 dma_sync_single_for_device(ctx->dev, edesc->dma_link_tbl,
974 edesc->dma_len, DMA_BIDIRECTIONAL);
975 }
976
977 /* iv out */
978 map_single_talitos_ptr(dev, &desc->ptr[6], ivsize, ctx->iv, 0,
979 DMA_FROM_DEVICE);
980
981 return talitos_submit(dev, desc, callback, areq);
982 }
983
984
985 /*
986 * derive number of elements in scatterlist
987 */
988 static int sg_count(struct scatterlist *sg_list, int nbytes)
989 {
990 struct scatterlist *sg = sg_list;
991 int sg_nents = 0;
992
993 while (nbytes) {
994 sg_nents++;
995 nbytes -= sg->length;
996 sg = sg_next(sg);
997 }
998
999 return sg_nents;
1000 }
1001
1002 /*
1003 * allocate and map the ipsec_esp extended descriptor
1004 */
1005 static struct ipsec_esp_edesc *ipsec_esp_edesc_alloc(struct aead_request *areq,
1006 int icv_stashing)
1007 {
1008 struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
1009 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
1010 struct ipsec_esp_edesc *edesc;
1011 int src_nents, dst_nents, alloc_len, dma_len;
1012
1013 if (areq->cryptlen + ctx->authsize > TALITOS_MAX_DATA_LEN) {
1014 dev_err(ctx->dev, "cryptlen exceeds h/w max limit\n");
1015 return ERR_PTR(-EINVAL);
1016 }
1017
1018 src_nents = sg_count(areq->src, areq->cryptlen + ctx->authsize);
1019 src_nents = (src_nents == 1) ? 0 : src_nents;
1020
1021 if (areq->dst == areq->src) {
1022 dst_nents = src_nents;
1023 } else {
1024 dst_nents = sg_count(areq->dst, areq->cryptlen + ctx->authsize);
1025 dst_nents = (dst_nents == 1) ? 0 : src_nents;
1026 }
1027
1028 /*
1029 * allocate space for base edesc plus the link tables,
1030 * allowing for a separate entry for the generated ICV (+ 1),
1031 * and the ICV data itself
1032 */
1033 alloc_len = sizeof(struct ipsec_esp_edesc);
1034 if (src_nents || dst_nents) {
1035 dma_len = (src_nents + dst_nents + 1) *
1036 sizeof(struct talitos_ptr) + ctx->authsize;
1037 alloc_len += dma_len;
1038 } else {
1039 dma_len = 0;
1040 alloc_len += icv_stashing ? ctx->authsize : 0;
1041 }
1042
1043 edesc = kmalloc(alloc_len, GFP_DMA);
1044 if (!edesc) {
1045 dev_err(ctx->dev, "could not allocate edescriptor\n");
1046 return ERR_PTR(-ENOMEM);
1047 }
1048
1049 edesc->src_nents = src_nents;
1050 edesc->dst_nents = dst_nents;
1051 edesc->dma_len = dma_len;
1052 edesc->dma_link_tbl = dma_map_single(ctx->dev, &edesc->link_tbl[0],
1053 edesc->dma_len, DMA_BIDIRECTIONAL);
1054
1055 return edesc;
1056 }
1057
1058 static int aead_authenc_encrypt(struct aead_request *req)
1059 {
1060 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
1061 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
1062 struct ipsec_esp_edesc *edesc;
1063
1064 /* allocate extended descriptor */
1065 edesc = ipsec_esp_edesc_alloc(req, 0);
1066 if (IS_ERR(edesc))
1067 return PTR_ERR(edesc);
1068
1069 /* set encrypt */
1070 edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_MODE0_ENCRYPT;
1071
1072 return ipsec_esp(edesc, req, NULL, 0, ipsec_esp_encrypt_done);
1073 }
1074
1075 static int aead_authenc_decrypt(struct aead_request *req)
1076 {
1077 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
1078 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
1079 unsigned int authsize = ctx->authsize;
1080 struct ipsec_esp_edesc *edesc;
1081 struct scatterlist *sg;
1082 void *icvdata;
1083
1084 req->cryptlen -= authsize;
1085
1086 /* allocate extended descriptor */
1087 edesc = ipsec_esp_edesc_alloc(req, 1);
1088 if (IS_ERR(edesc))
1089 return PTR_ERR(edesc);
1090
1091 /* stash incoming ICV for later cmp with ICV generated by the h/w */
1092 if (edesc->dma_len)
1093 icvdata = &edesc->link_tbl[edesc->src_nents +
1094 edesc->dst_nents + 1];
1095 else
1096 icvdata = &edesc->link_tbl[0];
1097
1098 sg = sg_last(req->src, edesc->src_nents ? : 1);
1099
1100 memcpy(icvdata, (char *)sg_virt(sg) + sg->length - ctx->authsize,
1101 ctx->authsize);
1102
1103 /* decrypt */
1104 edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_DIR_INBOUND;
1105
1106 return ipsec_esp(edesc, req, NULL, 0, ipsec_esp_decrypt_done);
1107 }
1108
1109 static int aead_authenc_givencrypt(
1110 struct aead_givcrypt_request *req)
1111 {
1112 struct aead_request *areq = &req->areq;
1113 struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
1114 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
1115 struct ipsec_esp_edesc *edesc;
1116
1117 /* allocate extended descriptor */
1118 edesc = ipsec_esp_edesc_alloc(areq, 0);
1119 if (IS_ERR(edesc))
1120 return PTR_ERR(edesc);
1121
1122 /* set encrypt */
1123 edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_MODE0_ENCRYPT;
1124
1125 memcpy(req->giv, ctx->iv, crypto_aead_ivsize(authenc));
1126
1127 return ipsec_esp(edesc, areq, req->giv, req->seq,
1128 ipsec_esp_encrypt_done);
1129 }
1130
1131 struct talitos_alg_template {
1132 char name[CRYPTO_MAX_ALG_NAME];
1133 char driver_name[CRYPTO_MAX_ALG_NAME];
1134 unsigned int blocksize;
1135 struct aead_alg aead;
1136 struct device *dev;
1137 __be32 desc_hdr_template;
1138 };
1139
1140 static struct talitos_alg_template driver_algs[] = {
1141 /* single-pass ipsec_esp descriptor */
1142 {
1143 .name = "authenc(hmac(sha1),cbc(aes))",
1144 .driver_name = "authenc-hmac-sha1-cbc-aes-talitos",
1145 .blocksize = AES_BLOCK_SIZE,
1146 .aead = {
1147 .setkey = aead_authenc_setkey,
1148 .setauthsize = aead_authenc_setauthsize,
1149 .encrypt = aead_authenc_encrypt,
1150 .decrypt = aead_authenc_decrypt,
1151 .givencrypt = aead_authenc_givencrypt,
1152 .geniv = "<built-in>",
1153 .ivsize = AES_BLOCK_SIZE,
1154 .maxauthsize = SHA1_DIGEST_SIZE,
1155 },
1156 .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
1157 DESC_HDR_SEL0_AESU |
1158 DESC_HDR_MODE0_AESU_CBC |
1159 DESC_HDR_SEL1_MDEUA |
1160 DESC_HDR_MODE1_MDEU_INIT |
1161 DESC_HDR_MODE1_MDEU_PAD |
1162 DESC_HDR_MODE1_MDEU_SHA1_HMAC,
1163 },
1164 {
1165 .name = "authenc(hmac(sha1),cbc(des3_ede))",
1166 .driver_name = "authenc-hmac-sha1-cbc-3des-talitos",
1167 .blocksize = DES3_EDE_BLOCK_SIZE,
1168 .aead = {
1169 .setkey = aead_authenc_setkey,
1170 .setauthsize = aead_authenc_setauthsize,
1171 .encrypt = aead_authenc_encrypt,
1172 .decrypt = aead_authenc_decrypt,
1173 .givencrypt = aead_authenc_givencrypt,
1174 .geniv = "<built-in>",
1175 .ivsize = DES3_EDE_BLOCK_SIZE,
1176 .maxauthsize = SHA1_DIGEST_SIZE,
1177 },
1178 .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
1179 DESC_HDR_SEL0_DEU |
1180 DESC_HDR_MODE0_DEU_CBC |
1181 DESC_HDR_MODE0_DEU_3DES |
1182 DESC_HDR_SEL1_MDEUA |
1183 DESC_HDR_MODE1_MDEU_INIT |
1184 DESC_HDR_MODE1_MDEU_PAD |
1185 DESC_HDR_MODE1_MDEU_SHA1_HMAC,
1186 },
1187 {
1188 .name = "authenc(hmac(sha256),cbc(aes))",
1189 .driver_name = "authenc-hmac-sha256-cbc-aes-talitos",
1190 .blocksize = AES_BLOCK_SIZE,
1191 .aead = {
1192 .setkey = aead_authenc_setkey,
1193 .setauthsize = aead_authenc_setauthsize,
1194 .encrypt = aead_authenc_encrypt,
1195 .decrypt = aead_authenc_decrypt,
1196 .givencrypt = aead_authenc_givencrypt,
1197 .geniv = "<built-in>",
1198 .ivsize = AES_BLOCK_SIZE,
1199 .maxauthsize = SHA256_DIGEST_SIZE,
1200 },
1201 .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
1202 DESC_HDR_SEL0_AESU |
1203 DESC_HDR_MODE0_AESU_CBC |
1204 DESC_HDR_SEL1_MDEUA |
1205 DESC_HDR_MODE1_MDEU_INIT |
1206 DESC_HDR_MODE1_MDEU_PAD |
1207 DESC_HDR_MODE1_MDEU_SHA256_HMAC,
1208 },
1209 {
1210 .name = "authenc(hmac(sha256),cbc(des3_ede))",
1211 .driver_name = "authenc-hmac-sha256-cbc-3des-talitos",
1212 .blocksize = DES3_EDE_BLOCK_SIZE,
1213 .aead = {
1214 .setkey = aead_authenc_setkey,
1215 .setauthsize = aead_authenc_setauthsize,
1216 .encrypt = aead_authenc_encrypt,
1217 .decrypt = aead_authenc_decrypt,
1218 .givencrypt = aead_authenc_givencrypt,
1219 .geniv = "<built-in>",
1220 .ivsize = DES3_EDE_BLOCK_SIZE,
1221 .maxauthsize = SHA256_DIGEST_SIZE,
1222 },
1223 .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
1224 DESC_HDR_SEL0_DEU |
1225 DESC_HDR_MODE0_DEU_CBC |
1226 DESC_HDR_MODE0_DEU_3DES |
1227 DESC_HDR_SEL1_MDEUA |
1228 DESC_HDR_MODE1_MDEU_INIT |
1229 DESC_HDR_MODE1_MDEU_PAD |
1230 DESC_HDR_MODE1_MDEU_SHA256_HMAC,
1231 },
1232 {
1233 .name = "authenc(hmac(md5),cbc(aes))",
1234 .driver_name = "authenc-hmac-md5-cbc-aes-talitos",
1235 .blocksize = AES_BLOCK_SIZE,
1236 .aead = {
1237 .setkey = aead_authenc_setkey,
1238 .setauthsize = aead_authenc_setauthsize,
1239 .encrypt = aead_authenc_encrypt,
1240 .decrypt = aead_authenc_decrypt,
1241 .givencrypt = aead_authenc_givencrypt,
1242 .geniv = "<built-in>",
1243 .ivsize = AES_BLOCK_SIZE,
1244 .maxauthsize = MD5_DIGEST_SIZE,
1245 },
1246 .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
1247 DESC_HDR_SEL0_AESU |
1248 DESC_HDR_MODE0_AESU_CBC |
1249 DESC_HDR_SEL1_MDEUA |
1250 DESC_HDR_MODE1_MDEU_INIT |
1251 DESC_HDR_MODE1_MDEU_PAD |
1252 DESC_HDR_MODE1_MDEU_MD5_HMAC,
1253 },
1254 {
1255 .name = "authenc(hmac(md5),cbc(des3_ede))",
1256 .driver_name = "authenc-hmac-md5-cbc-3des-talitos",
1257 .blocksize = DES3_EDE_BLOCK_SIZE,
1258 .aead = {
1259 .setkey = aead_authenc_setkey,
1260 .setauthsize = aead_authenc_setauthsize,
1261 .encrypt = aead_authenc_encrypt,
1262 .decrypt = aead_authenc_decrypt,
1263 .givencrypt = aead_authenc_givencrypt,
1264 .geniv = "<built-in>",
1265 .ivsize = DES3_EDE_BLOCK_SIZE,
1266 .maxauthsize = MD5_DIGEST_SIZE,
1267 },
1268 .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
1269 DESC_HDR_SEL0_DEU |
1270 DESC_HDR_MODE0_DEU_CBC |
1271 DESC_HDR_MODE0_DEU_3DES |
1272 DESC_HDR_SEL1_MDEUA |
1273 DESC_HDR_MODE1_MDEU_INIT |
1274 DESC_HDR_MODE1_MDEU_PAD |
1275 DESC_HDR_MODE1_MDEU_MD5_HMAC,
1276 }
1277 };
1278
1279 struct talitos_crypto_alg {
1280 struct list_head entry;
1281 struct device *dev;
1282 __be32 desc_hdr_template;
1283 struct crypto_alg crypto_alg;
1284 };
1285
1286 static int talitos_cra_init(struct crypto_tfm *tfm)
1287 {
1288 struct crypto_alg *alg = tfm->__crt_alg;
1289 struct talitos_crypto_alg *talitos_alg =
1290 container_of(alg, struct talitos_crypto_alg, crypto_alg);
1291 struct talitos_ctx *ctx = crypto_tfm_ctx(tfm);
1292
1293 /* update context with ptr to dev */
1294 ctx->dev = talitos_alg->dev;
1295 /* copy descriptor header template value */
1296 ctx->desc_hdr_template = talitos_alg->desc_hdr_template;
1297
1298 /* random first IV */
1299 get_random_bytes(ctx->iv, TALITOS_MAX_IV_LENGTH);
1300
1301 return 0;
1302 }
1303
1304 /*
1305 * given the alg's descriptor header template, determine whether descriptor
1306 * type and primary/secondary execution units required match the hw
1307 * capabilities description provided in the device tree node.
1308 */
1309 static int hw_supports(struct device *dev, __be32 desc_hdr_template)
1310 {
1311 struct talitos_private *priv = dev_get_drvdata(dev);
1312 int ret;
1313
1314 ret = (1 << DESC_TYPE(desc_hdr_template) & priv->desc_types) &&
1315 (1 << PRIMARY_EU(desc_hdr_template) & priv->exec_units);
1316
1317 if (SECONDARY_EU(desc_hdr_template))
1318 ret = ret && (1 << SECONDARY_EU(desc_hdr_template)
1319 & priv->exec_units);
1320
1321 return ret;
1322 }
1323
1324 static int __devexit talitos_remove(struct of_device *ofdev)
1325 {
1326 struct device *dev = &ofdev->dev;
1327 struct talitos_private *priv = dev_get_drvdata(dev);
1328 struct talitos_crypto_alg *t_alg, *n;
1329 int i;
1330
1331 list_for_each_entry_safe(t_alg, n, &priv->alg_list, entry) {
1332 crypto_unregister_alg(&t_alg->crypto_alg);
1333 list_del(&t_alg->entry);
1334 kfree(t_alg);
1335 }
1336
1337 if (hw_supports(dev, DESC_HDR_SEL0_RNG))
1338 talitos_unregister_rng(dev);
1339
1340 kfree(priv->tail);
1341 kfree(priv->head);
1342
1343 if (priv->fifo)
1344 for (i = 0; i < priv->num_channels; i++)
1345 kfree(priv->fifo[i]);
1346
1347 kfree(priv->fifo);
1348 kfree(priv->head_lock);
1349 kfree(priv->tail_lock);
1350
1351 if (priv->irq != NO_IRQ) {
1352 free_irq(priv->irq, dev);
1353 irq_dispose_mapping(priv->irq);
1354 }
1355
1356 tasklet_kill(&priv->done_task);
1357 tasklet_kill(&priv->error_task);
1358
1359 iounmap(priv->reg);
1360
1361 dev_set_drvdata(dev, NULL);
1362
1363 kfree(priv);
1364
1365 return 0;
1366 }
1367
1368 static struct talitos_crypto_alg *talitos_alg_alloc(struct device *dev,
1369 struct talitos_alg_template
1370 *template)
1371 {
1372 struct talitos_crypto_alg *t_alg;
1373 struct crypto_alg *alg;
1374
1375 t_alg = kzalloc(sizeof(struct talitos_crypto_alg), GFP_KERNEL);
1376 if (!t_alg)
1377 return ERR_PTR(-ENOMEM);
1378
1379 alg = &t_alg->crypto_alg;
1380
1381 snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", template->name);
1382 snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
1383 template->driver_name);
1384 alg->cra_module = THIS_MODULE;
1385 alg->cra_init = talitos_cra_init;
1386 alg->cra_priority = TALITOS_CRA_PRIORITY;
1387 alg->cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC;
1388 alg->cra_blocksize = template->blocksize;
1389 alg->cra_alignmask = 0;
1390 alg->cra_type = &crypto_aead_type;
1391 alg->cra_ctxsize = sizeof(struct talitos_ctx);
1392 alg->cra_u.aead = template->aead;
1393
1394 t_alg->desc_hdr_template = template->desc_hdr_template;
1395 t_alg->dev = dev;
1396
1397 return t_alg;
1398 }
1399
1400 static int talitos_probe(struct of_device *ofdev,
1401 const struct of_device_id *match)
1402 {
1403 struct device *dev = &ofdev->dev;
1404 struct device_node *np = ofdev->node;
1405 struct talitos_private *priv;
1406 const unsigned int *prop;
1407 int i, err;
1408
1409 priv = kzalloc(sizeof(struct talitos_private), GFP_KERNEL);
1410 if (!priv)
1411 return -ENOMEM;
1412
1413 dev_set_drvdata(dev, priv);
1414
1415 priv->ofdev = ofdev;
1416
1417 tasklet_init(&priv->done_task, talitos_done, (unsigned long)dev);
1418 tasklet_init(&priv->error_task, talitos_error, (unsigned long)dev);
1419
1420 priv->irq = irq_of_parse_and_map(np, 0);
1421
1422 if (priv->irq == NO_IRQ) {
1423 dev_err(dev, "failed to map irq\n");
1424 err = -EINVAL;
1425 goto err_out;
1426 }
1427
1428 /* get the irq line */
1429 err = request_irq(priv->irq, talitos_interrupt, 0,
1430 dev_driver_string(dev), dev);
1431 if (err) {
1432 dev_err(dev, "failed to request irq %d\n", priv->irq);
1433 irq_dispose_mapping(priv->irq);
1434 priv->irq = NO_IRQ;
1435 goto err_out;
1436 }
1437
1438 priv->reg = of_iomap(np, 0);
1439 if (!priv->reg) {
1440 dev_err(dev, "failed to of_iomap\n");
1441 err = -ENOMEM;
1442 goto err_out;
1443 }
1444
1445 /* get SEC version capabilities from device tree */
1446 prop = of_get_property(np, "fsl,num-channels", NULL);
1447 if (prop)
1448 priv->num_channels = *prop;
1449
1450 prop = of_get_property(np, "fsl,channel-fifo-len", NULL);
1451 if (prop)
1452 priv->chfifo_len = *prop;
1453
1454 prop = of_get_property(np, "fsl,exec-units-mask", NULL);
1455 if (prop)
1456 priv->exec_units = *prop;
1457
1458 prop = of_get_property(np, "fsl,descriptor-types-mask", NULL);
1459 if (prop)
1460 priv->desc_types = *prop;
1461
1462 if (!is_power_of_2(priv->num_channels) || !priv->chfifo_len ||
1463 !priv->exec_units || !priv->desc_types) {
1464 dev_err(dev, "invalid property data in device tree node\n");
1465 err = -EINVAL;
1466 goto err_out;
1467 }
1468
1469 of_node_put(np);
1470 np = NULL;
1471
1472 priv->head_lock = kmalloc(sizeof(spinlock_t) * priv->num_channels,
1473 GFP_KERNEL);
1474 priv->tail_lock = kmalloc(sizeof(spinlock_t) * priv->num_channels,
1475 GFP_KERNEL);
1476 if (!priv->head_lock || !priv->tail_lock) {
1477 dev_err(dev, "failed to allocate fifo locks\n");
1478 err = -ENOMEM;
1479 goto err_out;
1480 }
1481
1482 for (i = 0; i < priv->num_channels; i++) {
1483 spin_lock_init(&priv->head_lock[i]);
1484 spin_lock_init(&priv->tail_lock[i]);
1485 }
1486
1487 priv->fifo = kmalloc(sizeof(struct talitos_request *) *
1488 priv->num_channels, GFP_KERNEL);
1489 if (!priv->fifo) {
1490 dev_err(dev, "failed to allocate request fifo\n");
1491 err = -ENOMEM;
1492 goto err_out;
1493 }
1494
1495 priv->fifo_len = roundup_pow_of_two(priv->chfifo_len);
1496
1497 for (i = 0; i < priv->num_channels; i++) {
1498 priv->fifo[i] = kzalloc(sizeof(struct talitos_request) *
1499 priv->fifo_len, GFP_KERNEL);
1500 if (!priv->fifo[i]) {
1501 dev_err(dev, "failed to allocate request fifo %d\n", i);
1502 err = -ENOMEM;
1503 goto err_out;
1504 }
1505 }
1506
1507 priv->head = kzalloc(sizeof(int) * priv->num_channels, GFP_KERNEL);
1508 priv->tail = kzalloc(sizeof(int) * priv->num_channels, GFP_KERNEL);
1509 if (!priv->head || !priv->tail) {
1510 dev_err(dev, "failed to allocate request index space\n");
1511 err = -ENOMEM;
1512 goto err_out;
1513 }
1514
1515 /* reset and initialize the h/w */
1516 err = init_device(dev);
1517 if (err) {
1518 dev_err(dev, "failed to initialize device\n");
1519 goto err_out;
1520 }
1521
1522 /* register the RNG, if available */
1523 if (hw_supports(dev, DESC_HDR_SEL0_RNG)) {
1524 err = talitos_register_rng(dev);
1525 if (err) {
1526 dev_err(dev, "failed to register hwrng: %d\n", err);
1527 goto err_out;
1528 } else
1529 dev_info(dev, "hwrng\n");
1530 }
1531
1532 /* register crypto algorithms the device supports */
1533 INIT_LIST_HEAD(&priv->alg_list);
1534
1535 for (i = 0; i < ARRAY_SIZE(driver_algs); i++) {
1536 if (hw_supports(dev, driver_algs[i].desc_hdr_template)) {
1537 struct talitos_crypto_alg *t_alg;
1538
1539 t_alg = talitos_alg_alloc(dev, &driver_algs[i]);
1540 if (IS_ERR(t_alg)) {
1541 err = PTR_ERR(t_alg);
1542 goto err_out;
1543 }
1544
1545 err = crypto_register_alg(&t_alg->crypto_alg);
1546 if (err) {
1547 dev_err(dev, "%s alg registration failed\n",
1548 t_alg->crypto_alg.cra_driver_name);
1549 kfree(t_alg);
1550 } else {
1551 list_add_tail(&t_alg->entry, &priv->alg_list);
1552 dev_info(dev, "%s\n",
1553 t_alg->crypto_alg.cra_driver_name);
1554 }
1555 }
1556 }
1557
1558 return 0;
1559
1560 err_out:
1561 talitos_remove(ofdev);
1562 if (np)
1563 of_node_put(np);
1564
1565 return err;
1566 }
1567
1568 static struct of_device_id talitos_match[] = {
1569 {
1570 .compatible = "fsl,sec2.0",
1571 },
1572 {},
1573 };
1574 MODULE_DEVICE_TABLE(of, talitos_match);
1575
1576 static struct of_platform_driver talitos_driver = {
1577 .name = "talitos",
1578 .match_table = talitos_match,
1579 .probe = talitos_probe,
1580 .remove = __devexit_p(talitos_remove),
1581 };
1582
1583 static int __init talitos_init(void)
1584 {
1585 return of_register_platform_driver(&talitos_driver);
1586 }
1587 module_init(talitos_init);
1588
1589 static void __exit talitos_exit(void)
1590 {
1591 of_unregister_platform_driver(&talitos_driver);
1592 }
1593 module_exit(talitos_exit);
1594
1595 MODULE_LICENSE("GPL");
1596 MODULE_AUTHOR("Kim Phillips <kim.phillips@freescale.com>");
1597 MODULE_DESCRIPTION("Freescale integrated security engine (SEC) driver");
linux 2.6 git repository for openrd