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nilfs2: use mnt_want_write in ioctls where write access is needed
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / crypto / talitos.c
blobc47ffe8a73efecbf836aef8f0e2417fd7ec42ee5
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 #include <crypto/skcipher.h>
48 #include <crypto/scatterwalk.h>
49
50 #include "talitos.h"
51
52 #define TALITOS_TIMEOUT 100000
53 #define TALITOS_MAX_DATA_LEN 65535
54
55 #define DESC_TYPE(desc_hdr) ((be32_to_cpu(desc_hdr) >> 3) & 0x1f)
56 #define PRIMARY_EU(desc_hdr) ((be32_to_cpu(desc_hdr) >> 28) & 0xf)
57 #define SECONDARY_EU(desc_hdr) ((be32_to_cpu(desc_hdr) >> 16) & 0xf)
58
59 /* descriptor pointer entry */
60 struct talitos_ptr {
61 __be16 len; /* length */
62 u8 j_extent; /* jump to sg link table and/or extent */
63 u8 eptr; /* extended address */
64 __be32 ptr; /* address */
65 };
66
67 /* descriptor */
68 struct talitos_desc {
69 __be32 hdr; /* header high bits */
70 __be32 hdr_lo; /* header low bits */
71 struct talitos_ptr ptr[7]; /* ptr/len pair array */
72 };
73
74 /**
75 * talitos_request - descriptor submission request
76 * @desc: descriptor pointer (kernel virtual)
77 * @dma_desc: descriptor's physical bus address
78 * @callback: whom to call when descriptor processing is done
79 * @context: caller context (optional)
80 */
81 struct talitos_request {
82 struct talitos_desc *desc;
83 dma_addr_t dma_desc;
84 void (*callback) (struct device *dev, struct talitos_desc *desc,
85 void *context, int error);
86 void *context;
87 };
88
89 /* per-channel fifo management */
90 struct talitos_channel {
91 /* request fifo */
92 struct talitos_request *fifo;
93
94 /* number of requests pending in channel h/w fifo */
95 atomic_t submit_count ____cacheline_aligned;
96
97 /* request submission (head) lock */
98 spinlock_t head_lock ____cacheline_aligned;
99 /* index to next free descriptor request */
100 int head;
101
102 /* request release (tail) lock */
103 spinlock_t tail_lock ____cacheline_aligned;
104 /* index to next in-progress/done descriptor request */
105 int tail;
106 };
107
108 struct talitos_private {
109 struct device *dev;
110 struct of_device *ofdev;
111 void __iomem *reg;
112 int irq;
113
114 /* SEC version geometry (from device tree node) */
115 unsigned int num_channels;
116 unsigned int chfifo_len;
117 unsigned int exec_units;
118 unsigned int desc_types;
119
120 /* SEC Compatibility info */
121 unsigned long features;
122
123 /*
124 * length of the request fifo
125 * fifo_len is chfifo_len rounded up to next power of 2
126 * so we can use bitwise ops to wrap
127 */
128 unsigned int fifo_len;
129
130 struct talitos_channel *chan;
131
132 /* next channel to be assigned next incoming descriptor */
133 atomic_t last_chan ____cacheline_aligned;
134
135 /* request callback tasklet */
136 struct tasklet_struct done_task;
137
138 /* list of registered algorithms */
139 struct list_head alg_list;
140
141 /* hwrng device */
142 struct hwrng rng;
143 };
144
145 /* .features flag */
146 #define TALITOS_FTR_SRC_LINK_TBL_LEN_INCLUDES_EXTENT 0x00000001
147 #define TALITOS_FTR_HW_AUTH_CHECK 0x00000002
148
149 static void to_talitos_ptr(struct talitos_ptr *talitos_ptr, dma_addr_t dma_addr)
150 {
151 talitos_ptr->ptr = cpu_to_be32(lower_32_bits(dma_addr));
152 talitos_ptr->eptr = cpu_to_be32(upper_32_bits(dma_addr));
153 }
154
155 /*
156 * map virtual single (contiguous) pointer to h/w descriptor pointer
157 */
158 static void map_single_talitos_ptr(struct device *dev,
159 struct talitos_ptr *talitos_ptr,
160 unsigned short len, void *data,
161 unsigned char extent,
162 enum dma_data_direction dir)
163 {
164 dma_addr_t dma_addr = dma_map_single(dev, data, len, dir);
165
166 talitos_ptr->len = cpu_to_be16(len);
167 to_talitos_ptr(talitos_ptr, dma_addr);
168 talitos_ptr->j_extent = extent;
169 }
170
171 /*
172 * unmap bus single (contiguous) h/w descriptor pointer
173 */
174 static void unmap_single_talitos_ptr(struct device *dev,
175 struct talitos_ptr *talitos_ptr,
176 enum dma_data_direction dir)
177 {
178 dma_unmap_single(dev, be32_to_cpu(talitos_ptr->ptr),
179 be16_to_cpu(talitos_ptr->len), dir);
180 }
181
182 static int reset_channel(struct device *dev, int ch)
183 {
184 struct talitos_private *priv = dev_get_drvdata(dev);
185 unsigned int timeout = TALITOS_TIMEOUT;
186
187 setbits32(priv->reg + TALITOS_CCCR(ch), TALITOS_CCCR_RESET);
188
189 while ((in_be32(priv->reg + TALITOS_CCCR(ch)) & TALITOS_CCCR_RESET)
190 && --timeout)
191 cpu_relax();
192
193 if (timeout == 0) {
194 dev_err(dev, "failed to reset channel %d\n", ch);
195 return -EIO;
196 }
197
198 /* set 36-bit addressing, done writeback enable and done IRQ enable */
199 setbits32(priv->reg + TALITOS_CCCR_LO(ch), TALITOS_CCCR_LO_EAE |
200 TALITOS_CCCR_LO_CDWE | TALITOS_CCCR_LO_CDIE);
201
202 /* and ICCR writeback, if available */
203 if (priv->features & TALITOS_FTR_HW_AUTH_CHECK)
204 setbits32(priv->reg + TALITOS_CCCR_LO(ch),
205 TALITOS_CCCR_LO_IWSE);
206
207 return 0;
208 }
209
210 static int reset_device(struct device *dev)
211 {
212 struct talitos_private *priv = dev_get_drvdata(dev);
213 unsigned int timeout = TALITOS_TIMEOUT;
214
215 setbits32(priv->reg + TALITOS_MCR, TALITOS_MCR_SWR);
216
217 while ((in_be32(priv->reg + TALITOS_MCR) & TALITOS_MCR_SWR)
218 && --timeout)
219 cpu_relax();
220
221 if (timeout == 0) {
222 dev_err(dev, "failed to reset device\n");
223 return -EIO;
224 }
225
226 return 0;
227 }
228
229 /*
230 * Reset and initialize the device
231 */
232 static int init_device(struct device *dev)
233 {
234 struct talitos_private *priv = dev_get_drvdata(dev);
235 int ch, err;
236
237 /*
238 * Master reset
239 * errata documentation: warning: certain SEC interrupts
240 * are not fully cleared by writing the MCR:SWR bit,
241 * set bit twice to completely reset
242 */
243 err = reset_device(dev);
244 if (err)
245 return err;
246
247 err = reset_device(dev);
248 if (err)
249 return err;
250
251 /* reset channels */
252 for (ch = 0; ch < priv->num_channels; ch++) {
253 err = reset_channel(dev, ch);
254 if (err)
255 return err;
256 }
257
258 /* enable channel done and error interrupts */
259 setbits32(priv->reg + TALITOS_IMR, TALITOS_IMR_INIT);
260 setbits32(priv->reg + TALITOS_IMR_LO, TALITOS_IMR_LO_INIT);
261
262 /* disable integrity check error interrupts (use writeback instead) */
263 if (priv->features & TALITOS_FTR_HW_AUTH_CHECK)
264 setbits32(priv->reg + TALITOS_MDEUICR_LO,
265 TALITOS_MDEUICR_LO_ICE);
266
267 return 0;
268 }
269
270 /**
271 * talitos_submit - submits a descriptor to the device for processing
272 * @dev: the SEC device to be used
273 * @desc: the descriptor to be processed by the device
274 * @callback: whom to call when processing is complete
275 * @context: a handle for use by caller (optional)
276 *
277 * desc must contain valid dma-mapped (bus physical) address pointers.
278 * callback must check err and feedback in descriptor header
279 * for device processing status.
280 */
281 static int talitos_submit(struct device *dev, struct talitos_desc *desc,
282 void (*callback)(struct device *dev,
283 struct talitos_desc *desc,
284 void *context, int error),
285 void *context)
286 {
287 struct talitos_private *priv = dev_get_drvdata(dev);
288 struct talitos_request *request;
289 unsigned long flags, ch;
290 int head;
291
292 /* select done notification */
293 desc->hdr |= DESC_HDR_DONE_NOTIFY;
294
295 /* emulate SEC's round-robin channel fifo polling scheme */
296 ch = atomic_inc_return(&priv->last_chan) & (priv->num_channels - 1);
297
298 spin_lock_irqsave(&priv->chan[ch].head_lock, flags);
299
300 if (!atomic_inc_not_zero(&priv->chan[ch].submit_count)) {
301 /* h/w fifo is full */
302 spin_unlock_irqrestore(&priv->chan[ch].head_lock, flags);
303 return -EAGAIN;
304 }
305
306 head = priv->chan[ch].head;
307 request = &priv->chan[ch].fifo[head];
308
309 /* map descriptor and save caller data */
310 request->dma_desc = dma_map_single(dev, desc, sizeof(*desc),
311 DMA_BIDIRECTIONAL);
312 request->callback = callback;
313 request->context = context;
314
315 /* increment fifo head */
316 priv->chan[ch].head = (priv->chan[ch].head + 1) & (priv->fifo_len - 1);
317
318 smp_wmb();
319 request->desc = desc;
320
321 /* GO! */
322 wmb();
323 out_be32(priv->reg + TALITOS_FF(ch),
324 cpu_to_be32(upper_32_bits(request->dma_desc)));
325 out_be32(priv->reg + TALITOS_FF_LO(ch),
326 cpu_to_be32(lower_32_bits(request->dma_desc)));
327
328 spin_unlock_irqrestore(&priv->chan[ch].head_lock, flags);
329
330 return -EINPROGRESS;
331 }
332
333 /*
334 * process what was done, notify callback of error if not
335 */
336 static void flush_channel(struct device *dev, int ch, int error, int reset_ch)
337 {
338 struct talitos_private *priv = dev_get_drvdata(dev);
339 struct talitos_request *request, saved_req;
340 unsigned long flags;
341 int tail, status;
342
343 spin_lock_irqsave(&priv->chan[ch].tail_lock, flags);
344
345 tail = priv->chan[ch].tail;
346 while (priv->chan[ch].fifo[tail].desc) {
347 request = &priv->chan[ch].fifo[tail];
348
349 /* descriptors with their done bits set don't get the error */
350 rmb();
351 if ((request->desc->hdr & DESC_HDR_DONE) == DESC_HDR_DONE)
352 status = 0;
353 else
354 if (!error)
355 break;
356 else
357 status = error;
358
359 dma_unmap_single(dev, request->dma_desc,
360 sizeof(struct talitos_desc),
361 DMA_BIDIRECTIONAL);
362
363 /* copy entries so we can call callback outside lock */
364 saved_req.desc = request->desc;
365 saved_req.callback = request->callback;
366 saved_req.context = request->context;
367
368 /* release request entry in fifo */
369 smp_wmb();
370 request->desc = NULL;
371
372 /* increment fifo tail */
373 priv->chan[ch].tail = (tail + 1) & (priv->fifo_len - 1);
374
375 spin_unlock_irqrestore(&priv->chan[ch].tail_lock, flags);
376
377 atomic_dec(&priv->chan[ch].submit_count);
378
379 saved_req.callback(dev, saved_req.desc, saved_req.context,
380 status);
381 /* channel may resume processing in single desc error case */
382 if (error && !reset_ch && status == error)
383 return;
384 spin_lock_irqsave(&priv->chan[ch].tail_lock, flags);
385 tail = priv->chan[ch].tail;
386 }
387
388 spin_unlock_irqrestore(&priv->chan[ch].tail_lock, flags);
389 }
390
391 /*
392 * process completed requests for channels that have done status
393 */
394 static void talitos_done(unsigned long data)
395 {
396 struct device *dev = (struct device *)data;
397 struct talitos_private *priv = dev_get_drvdata(dev);
398 int ch;
399
400 for (ch = 0; ch < priv->num_channels; ch++)
401 flush_channel(dev, ch, 0, 0);
402
403 /* At this point, all completed channels have been processed.
404 * Unmask done interrupts for channels completed later on.
405 */
406 setbits32(priv->reg + TALITOS_IMR, TALITOS_IMR_INIT);
407 setbits32(priv->reg + TALITOS_IMR_LO, TALITOS_IMR_LO_INIT);
408 }
409
410 /*
411 * locate current (offending) descriptor
412 */
413 static struct talitos_desc *current_desc(struct device *dev, int ch)
414 {
415 struct talitos_private *priv = dev_get_drvdata(dev);
416 int tail = priv->chan[ch].tail;
417 dma_addr_t cur_desc;
418
419 cur_desc = in_be32(priv->reg + TALITOS_CDPR_LO(ch));
420
421 while (priv->chan[ch].fifo[tail].dma_desc != cur_desc) {
422 tail = (tail + 1) & (priv->fifo_len - 1);
423 if (tail == priv->chan[ch].tail) {
424 dev_err(dev, "couldn't locate current descriptor\n");
425 return NULL;
426 }
427 }
428
429 return priv->chan[ch].fifo[tail].desc;
430 }
431
432 /*
433 * user diagnostics; report root cause of error based on execution unit status
434 */
435 static void report_eu_error(struct device *dev, int ch,
436 struct talitos_desc *desc)
437 {
438 struct talitos_private *priv = dev_get_drvdata(dev);
439 int i;
440
441 switch (desc->hdr & DESC_HDR_SEL0_MASK) {
442 case DESC_HDR_SEL0_AFEU:
443 dev_err(dev, "AFEUISR 0x%08x_%08x\n",
444 in_be32(priv->reg + TALITOS_AFEUISR),
445 in_be32(priv->reg + TALITOS_AFEUISR_LO));
446 break;
447 case DESC_HDR_SEL0_DEU:
448 dev_err(dev, "DEUISR 0x%08x_%08x\n",
449 in_be32(priv->reg + TALITOS_DEUISR),
450 in_be32(priv->reg + TALITOS_DEUISR_LO));
451 break;
452 case DESC_HDR_SEL0_MDEUA:
453 case DESC_HDR_SEL0_MDEUB:
454 dev_err(dev, "MDEUISR 0x%08x_%08x\n",
455 in_be32(priv->reg + TALITOS_MDEUISR),
456 in_be32(priv->reg + TALITOS_MDEUISR_LO));
457 break;
458 case DESC_HDR_SEL0_RNG:
459 dev_err(dev, "RNGUISR 0x%08x_%08x\n",
460 in_be32(priv->reg + TALITOS_RNGUISR),
461 in_be32(priv->reg + TALITOS_RNGUISR_LO));
462 break;
463 case DESC_HDR_SEL0_PKEU:
464 dev_err(dev, "PKEUISR 0x%08x_%08x\n",
465 in_be32(priv->reg + TALITOS_PKEUISR),
466 in_be32(priv->reg + TALITOS_PKEUISR_LO));
467 break;
468 case DESC_HDR_SEL0_AESU:
469 dev_err(dev, "AESUISR 0x%08x_%08x\n",
470 in_be32(priv->reg + TALITOS_AESUISR),
471 in_be32(priv->reg + TALITOS_AESUISR_LO));
472 break;
473 case DESC_HDR_SEL0_CRCU:
474 dev_err(dev, "CRCUISR 0x%08x_%08x\n",
475 in_be32(priv->reg + TALITOS_CRCUISR),
476 in_be32(priv->reg + TALITOS_CRCUISR_LO));
477 break;
478 case DESC_HDR_SEL0_KEU:
479 dev_err(dev, "KEUISR 0x%08x_%08x\n",
480 in_be32(priv->reg + TALITOS_KEUISR),
481 in_be32(priv->reg + TALITOS_KEUISR_LO));
482 break;
483 }
484
485 switch (desc->hdr & DESC_HDR_SEL1_MASK) {
486 case DESC_HDR_SEL1_MDEUA:
487 case DESC_HDR_SEL1_MDEUB:
488 dev_err(dev, "MDEUISR 0x%08x_%08x\n",
489 in_be32(priv->reg + TALITOS_MDEUISR),
490 in_be32(priv->reg + TALITOS_MDEUISR_LO));
491 break;
492 case DESC_HDR_SEL1_CRCU:
493 dev_err(dev, "CRCUISR 0x%08x_%08x\n",
494 in_be32(priv->reg + TALITOS_CRCUISR),
495 in_be32(priv->reg + TALITOS_CRCUISR_LO));
496 break;
497 }
498
499 for (i = 0; i < 8; i++)
500 dev_err(dev, "DESCBUF 0x%08x_%08x\n",
501 in_be32(priv->reg + TALITOS_DESCBUF(ch) + 8*i),
502 in_be32(priv->reg + TALITOS_DESCBUF_LO(ch) + 8*i));
503 }
504
505 /*
506 * recover from error interrupts
507 */
508 static void talitos_error(unsigned long data, u32 isr, u32 isr_lo)
509 {
510 struct device *dev = (struct device *)data;
511 struct talitos_private *priv = dev_get_drvdata(dev);
512 unsigned int timeout = TALITOS_TIMEOUT;
513 int ch, error, reset_dev = 0, reset_ch = 0;
514 u32 v, v_lo;
515
516 for (ch = 0; ch < priv->num_channels; ch++) {
517 /* skip channels without errors */
518 if (!(isr & (1 << (ch * 2 + 1))))
519 continue;
520
521 error = -EINVAL;
522
523 v = in_be32(priv->reg + TALITOS_CCPSR(ch));
524 v_lo = in_be32(priv->reg + TALITOS_CCPSR_LO(ch));
525
526 if (v_lo & TALITOS_CCPSR_LO_DOF) {
527 dev_err(dev, "double fetch fifo overflow error\n");
528 error = -EAGAIN;
529 reset_ch = 1;
530 }
531 if (v_lo & TALITOS_CCPSR_LO_SOF) {
532 /* h/w dropped descriptor */
533 dev_err(dev, "single fetch fifo overflow error\n");
534 error = -EAGAIN;
535 }
536 if (v_lo & TALITOS_CCPSR_LO_MDTE)
537 dev_err(dev, "master data transfer error\n");
538 if (v_lo & TALITOS_CCPSR_LO_SGDLZ)
539 dev_err(dev, "s/g data length zero error\n");
540 if (v_lo & TALITOS_CCPSR_LO_FPZ)
541 dev_err(dev, "fetch pointer zero error\n");
542 if (v_lo & TALITOS_CCPSR_LO_IDH)
543 dev_err(dev, "illegal descriptor header error\n");
544 if (v_lo & TALITOS_CCPSR_LO_IEU)
545 dev_err(dev, "invalid execution unit error\n");
546 if (v_lo & TALITOS_CCPSR_LO_EU)
547 report_eu_error(dev, ch, current_desc(dev, ch));
548 if (v_lo & TALITOS_CCPSR_LO_GB)
549 dev_err(dev, "gather boundary error\n");
550 if (v_lo & TALITOS_CCPSR_LO_GRL)
551 dev_err(dev, "gather return/length error\n");
552 if (v_lo & TALITOS_CCPSR_LO_SB)
553 dev_err(dev, "scatter boundary error\n");
554 if (v_lo & TALITOS_CCPSR_LO_SRL)
555 dev_err(dev, "scatter return/length error\n");
556
557 flush_channel(dev, ch, error, reset_ch);
558
559 if (reset_ch) {
560 reset_channel(dev, ch);
561 } else {
562 setbits32(priv->reg + TALITOS_CCCR(ch),
563 TALITOS_CCCR_CONT);
564 setbits32(priv->reg + TALITOS_CCCR_LO(ch), 0);
565 while ((in_be32(priv->reg + TALITOS_CCCR(ch)) &
566 TALITOS_CCCR_CONT) && --timeout)
567 cpu_relax();
568 if (timeout == 0) {
569 dev_err(dev, "failed to restart channel %d\n",
570 ch);
571 reset_dev = 1;
572 }
573 }
574 }
575 if (reset_dev || isr & ~TALITOS_ISR_CHERR || isr_lo) {
576 dev_err(dev, "done overflow, internal time out, or rngu error: "
577 "ISR 0x%08x_%08x\n", isr, isr_lo);
578
579 /* purge request queues */
580 for (ch = 0; ch < priv->num_channels; ch++)
581 flush_channel(dev, ch, -EIO, 1);
582
583 /* reset and reinitialize the device */
584 init_device(dev);
585 }
586 }
587
588 static irqreturn_t talitos_interrupt(int irq, void *data)
589 {
590 struct device *dev = data;
591 struct talitos_private *priv = dev_get_drvdata(dev);
592 u32 isr, isr_lo;
593
594 isr = in_be32(priv->reg + TALITOS_ISR);
595 isr_lo = in_be32(priv->reg + TALITOS_ISR_LO);
596 /* Acknowledge interrupt */
597 out_be32(priv->reg + TALITOS_ICR, isr);
598 out_be32(priv->reg + TALITOS_ICR_LO, isr_lo);
599
600 if (unlikely((isr & ~TALITOS_ISR_CHDONE) || isr_lo))
601 talitos_error((unsigned long)data, isr, isr_lo);
602 else
603 if (likely(isr & TALITOS_ISR_CHDONE)) {
604 /* mask further done interrupts. */
605 clrbits32(priv->reg + TALITOS_IMR, TALITOS_IMR_DONE);
606 /* done_task will unmask done interrupts at exit */
607 tasklet_schedule(&priv->done_task);
608 }
609
610 return (isr || isr_lo) ? IRQ_HANDLED : IRQ_NONE;
611 }
612
613 /*
614 * hwrng
615 */
616 static int talitos_rng_data_present(struct hwrng *rng, int wait)
617 {
618 struct device *dev = (struct device *)rng->priv;
619 struct talitos_private *priv = dev_get_drvdata(dev);
620 u32 ofl;
621 int i;
622
623 for (i = 0; i < 20; i++) {
624 ofl = in_be32(priv->reg + TALITOS_RNGUSR_LO) &
625 TALITOS_RNGUSR_LO_OFL;
626 if (ofl || !wait)
627 break;
628 udelay(10);
629 }
630
631 return !!ofl;
632 }
633
634 static int talitos_rng_data_read(struct hwrng *rng, u32 *data)
635 {
636 struct device *dev = (struct device *)rng->priv;
637 struct talitos_private *priv = dev_get_drvdata(dev);
638
639 /* rng fifo requires 64-bit accesses */
640 *data = in_be32(priv->reg + TALITOS_RNGU_FIFO);
641 *data = in_be32(priv->reg + TALITOS_RNGU_FIFO_LO);
642
643 return sizeof(u32);
644 }
645
646 static int talitos_rng_init(struct hwrng *rng)
647 {
648 struct device *dev = (struct device *)rng->priv;
649 struct talitos_private *priv = dev_get_drvdata(dev);
650 unsigned int timeout = TALITOS_TIMEOUT;
651
652 setbits32(priv->reg + TALITOS_RNGURCR_LO, TALITOS_RNGURCR_LO_SR);
653 while (!(in_be32(priv->reg + TALITOS_RNGUSR_LO) & TALITOS_RNGUSR_LO_RD)
654 && --timeout)
655 cpu_relax();
656 if (timeout == 0) {
657 dev_err(dev, "failed to reset rng hw\n");
658 return -ENODEV;
659 }
660
661 /* start generating */
662 setbits32(priv->reg + TALITOS_RNGUDSR_LO, 0);
663
664 return 0;
665 }
666
667 static int talitos_register_rng(struct device *dev)
668 {
669 struct talitos_private *priv = dev_get_drvdata(dev);
670
671 priv->rng.name = dev_driver_string(dev),
672 priv->rng.init = talitos_rng_init,
673 priv->rng.data_present = talitos_rng_data_present,
674 priv->rng.data_read = talitos_rng_data_read,
675 priv->rng.priv = (unsigned long)dev;
676
677 return hwrng_register(&priv->rng);
678 }
679
680 static void talitos_unregister_rng(struct device *dev)
681 {
682 struct talitos_private *priv = dev_get_drvdata(dev);
683
684 hwrng_unregister(&priv->rng);
685 }
686
687 /*
688 * crypto alg
689 */
690 #define TALITOS_CRA_PRIORITY 3000
691 #define TALITOS_MAX_KEY_SIZE 64
692 #define TALITOS_MAX_IV_LENGTH 16 /* max of AES_BLOCK_SIZE, DES3_EDE_BLOCK_SIZE */
693
694 #define MD5_DIGEST_SIZE 16
695
696 struct talitos_ctx {
697 struct device *dev;
698 __be32 desc_hdr_template;
699 u8 key[TALITOS_MAX_KEY_SIZE];
700 u8 iv[TALITOS_MAX_IV_LENGTH];
701 unsigned int keylen;
702 unsigned int enckeylen;
703 unsigned int authkeylen;
704 unsigned int authsize;
705 };
706
707 static int aead_setauthsize(struct crypto_aead *authenc,
708 unsigned int authsize)
709 {
710 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
711
712 ctx->authsize = authsize;
713
714 return 0;
715 }
716
717 static int aead_setkey(struct crypto_aead *authenc,
718 const u8 *key, unsigned int keylen)
719 {
720 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
721 struct rtattr *rta = (void *)key;
722 struct crypto_authenc_key_param *param;
723 unsigned int authkeylen;
724 unsigned int enckeylen;
725
726 if (!RTA_OK(rta, keylen))
727 goto badkey;
728
729 if (rta->rta_type != CRYPTO_AUTHENC_KEYA_PARAM)
730 goto badkey;
731
732 if (RTA_PAYLOAD(rta) < sizeof(*param))
733 goto badkey;
734
735 param = RTA_DATA(rta);
736 enckeylen = be32_to_cpu(param->enckeylen);
737
738 key += RTA_ALIGN(rta->rta_len);
739 keylen -= RTA_ALIGN(rta->rta_len);
740
741 if (keylen < enckeylen)
742 goto badkey;
743
744 authkeylen = keylen - enckeylen;
745
746 if (keylen > TALITOS_MAX_KEY_SIZE)
747 goto badkey;
748
749 memcpy(&ctx->key, key, keylen);
750
751 ctx->keylen = keylen;
752 ctx->enckeylen = enckeylen;
753 ctx->authkeylen = authkeylen;
754
755 return 0;
756
757 badkey:
758 crypto_aead_set_flags(authenc, CRYPTO_TFM_RES_BAD_KEY_LEN);
759 return -EINVAL;
760 }
761
762 /*
763 * talitos_edesc - s/w-extended descriptor
764 * @src_nents: number of segments in input scatterlist
765 * @dst_nents: number of segments in output scatterlist
766 * @dma_len: length of dma mapped link_tbl space
767 * @dma_link_tbl: bus physical address of link_tbl
768 * @desc: h/w descriptor
769 * @link_tbl: input and output h/w link tables (if {src,dst}_nents > 1)
770 *
771 * if decrypting (with authcheck), or either one of src_nents or dst_nents
772 * is greater than 1, an integrity check value is concatenated to the end
773 * of link_tbl data
774 */
775 struct talitos_edesc {
776 int src_nents;
777 int dst_nents;
778 int src_is_chained;
779 int dst_is_chained;
780 int dma_len;
781 dma_addr_t dma_link_tbl;
782 struct talitos_desc desc;
783 struct talitos_ptr link_tbl[0];
784 };
785
786 static int talitos_map_sg(struct device *dev, struct scatterlist *sg,
787 unsigned int nents, enum dma_data_direction dir,
788 int chained)
789 {
790 if (unlikely(chained))
791 while (sg) {
792 dma_map_sg(dev, sg, 1, dir);
793 sg = scatterwalk_sg_next(sg);
794 }
795 else
796 dma_map_sg(dev, sg, nents, dir);
797 return nents;
798 }
799
800 static void talitos_unmap_sg_chain(struct device *dev, struct scatterlist *sg,
801 enum dma_data_direction dir)
802 {
803 while (sg) {
804 dma_unmap_sg(dev, sg, 1, dir);
805 sg = scatterwalk_sg_next(sg);
806 }
807 }
808
809 static void talitos_sg_unmap(struct device *dev,
810 struct talitos_edesc *edesc,
811 struct scatterlist *src,
812 struct scatterlist *dst)
813 {
814 unsigned int src_nents = edesc->src_nents ? : 1;
815 unsigned int dst_nents = edesc->dst_nents ? : 1;
816
817 if (src != dst) {
818 if (edesc->src_is_chained)
819 talitos_unmap_sg_chain(dev, src, DMA_TO_DEVICE);
820 else
821 dma_unmap_sg(dev, src, src_nents, DMA_TO_DEVICE);
822
823 if (edesc->dst_is_chained)
824 talitos_unmap_sg_chain(dev, dst, DMA_FROM_DEVICE);
825 else
826 dma_unmap_sg(dev, dst, dst_nents, DMA_FROM_DEVICE);
827 } else
828 if (edesc->src_is_chained)
829 talitos_unmap_sg_chain(dev, src, DMA_BIDIRECTIONAL);
830 else
831 dma_unmap_sg(dev, src, src_nents, DMA_BIDIRECTIONAL);
832 }
833
834 static void ipsec_esp_unmap(struct device *dev,
835 struct talitos_edesc *edesc,
836 struct aead_request *areq)
837 {
838 unmap_single_talitos_ptr(dev, &edesc->desc.ptr[6], DMA_FROM_DEVICE);
839 unmap_single_talitos_ptr(dev, &edesc->desc.ptr[3], DMA_TO_DEVICE);
840 unmap_single_talitos_ptr(dev, &edesc->desc.ptr[2], DMA_TO_DEVICE);
841 unmap_single_talitos_ptr(dev, &edesc->desc.ptr[0], DMA_TO_DEVICE);
842
843 dma_unmap_sg(dev, areq->assoc, 1, DMA_TO_DEVICE);
844
845 talitos_sg_unmap(dev, edesc, areq->src, areq->dst);
846
847 if (edesc->dma_len)
848 dma_unmap_single(dev, edesc->dma_link_tbl, edesc->dma_len,
849 DMA_BIDIRECTIONAL);
850 }
851
852 /*
853 * ipsec_esp descriptor callbacks
854 */
855 static void ipsec_esp_encrypt_done(struct device *dev,
856 struct talitos_desc *desc, void *context,
857 int err)
858 {
859 struct aead_request *areq = context;
860 struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
861 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
862 struct talitos_edesc *edesc;
863 struct scatterlist *sg;
864 void *icvdata;
865
866 edesc = container_of(desc, struct talitos_edesc, desc);
867
868 ipsec_esp_unmap(dev, edesc, areq);
869
870 /* copy the generated ICV to dst */
871 if (edesc->dma_len) {
872 icvdata = &edesc->link_tbl[edesc->src_nents +
873 edesc->dst_nents + 2];
874 sg = sg_last(areq->dst, edesc->dst_nents);
875 memcpy((char *)sg_virt(sg) + sg->length - ctx->authsize,
876 icvdata, ctx->authsize);
877 }
878
879 kfree(edesc);
880
881 aead_request_complete(areq, err);
882 }
883
884 static void ipsec_esp_decrypt_swauth_done(struct device *dev,
885 struct talitos_desc *desc,
886 void *context, int err)
887 {
888 struct aead_request *req = context;
889 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
890 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
891 struct talitos_edesc *edesc;
892 struct scatterlist *sg;
893 void *icvdata;
894
895 edesc = container_of(desc, struct talitos_edesc, desc);
896
897 ipsec_esp_unmap(dev, edesc, req);
898
899 if (!err) {
900 /* auth check */
901 if (edesc->dma_len)
902 icvdata = &edesc->link_tbl[edesc->src_nents +
903 edesc->dst_nents + 2];
904 else
905 icvdata = &edesc->link_tbl[0];
906
907 sg = sg_last(req->dst, edesc->dst_nents ? : 1);
908 err = memcmp(icvdata, (char *)sg_virt(sg) + sg->length -
909 ctx->authsize, ctx->authsize) ? -EBADMSG : 0;
910 }
911
912 kfree(edesc);
913
914 aead_request_complete(req, err);
915 }
916
917 static void ipsec_esp_decrypt_hwauth_done(struct device *dev,
918 struct talitos_desc *desc,
919 void *context, int err)
920 {
921 struct aead_request *req = context;
922 struct talitos_edesc *edesc;
923
924 edesc = container_of(desc, struct talitos_edesc, desc);
925
926 ipsec_esp_unmap(dev, edesc, req);
927
928 /* check ICV auth status */
929 if (!err && ((desc->hdr_lo & DESC_HDR_LO_ICCR1_MASK) !=
930 DESC_HDR_LO_ICCR1_PASS))
931 err = -EBADMSG;
932
933 kfree(edesc);
934
935 aead_request_complete(req, err);
936 }
937
938 /*
939 * convert scatterlist to SEC h/w link table format
940 * stop at cryptlen bytes
941 */
942 static int sg_to_link_tbl(struct scatterlist *sg, int sg_count,
943 int cryptlen, struct talitos_ptr *link_tbl_ptr)
944 {
945 int n_sg = sg_count;
946
947 while (n_sg--) {
948 to_talitos_ptr(link_tbl_ptr, sg_dma_address(sg));
949 link_tbl_ptr->len = cpu_to_be16(sg_dma_len(sg));
950 link_tbl_ptr->j_extent = 0;
951 link_tbl_ptr++;
952 cryptlen -= sg_dma_len(sg);
953 sg = scatterwalk_sg_next(sg);
954 }
955
956 /* adjust (decrease) last one (or two) entry's len to cryptlen */
957 link_tbl_ptr--;
958 while (be16_to_cpu(link_tbl_ptr->len) <= (-cryptlen)) {
959 /* Empty this entry, and move to previous one */
960 cryptlen += be16_to_cpu(link_tbl_ptr->len);
961 link_tbl_ptr->len = 0;
962 sg_count--;
963 link_tbl_ptr--;
964 }
965 link_tbl_ptr->len = cpu_to_be16(be16_to_cpu(link_tbl_ptr->len)
966 + cryptlen);
967
968 /* tag end of link table */
969 link_tbl_ptr->j_extent = DESC_PTR_LNKTBL_RETURN;
970
971 return sg_count;
972 }
973
974 /*
975 * fill in and submit ipsec_esp descriptor
976 */
977 static int ipsec_esp(struct talitos_edesc *edesc, struct aead_request *areq,
978 u8 *giv, u64 seq,
979 void (*callback) (struct device *dev,
980 struct talitos_desc *desc,
981 void *context, int error))
982 {
983 struct crypto_aead *aead = crypto_aead_reqtfm(areq);
984 struct talitos_ctx *ctx = crypto_aead_ctx(aead);
985 struct device *dev = ctx->dev;
986 struct talitos_desc *desc = &edesc->desc;
987 unsigned int cryptlen = areq->cryptlen;
988 unsigned int authsize = ctx->authsize;
989 unsigned int ivsize = crypto_aead_ivsize(aead);
990 int sg_count, ret;
991 int sg_link_tbl_len;
992
993 /* hmac key */
994 map_single_talitos_ptr(dev, &desc->ptr[0], ctx->authkeylen, &ctx->key,
995 0, DMA_TO_DEVICE);
996 /* hmac data */
997 map_single_talitos_ptr(dev, &desc->ptr[1], areq->assoclen + ivsize,
998 sg_virt(areq->assoc), 0, DMA_TO_DEVICE);
999 /* cipher iv */
1000 map_single_talitos_ptr(dev, &desc->ptr[2], ivsize, giv ?: areq->iv, 0,
1001 DMA_TO_DEVICE);
1002
1003 /* cipher key */
1004 map_single_talitos_ptr(dev, &desc->ptr[3], ctx->enckeylen,
1005 (char *)&ctx->key + ctx->authkeylen, 0,
1006 DMA_TO_DEVICE);
1007
1008 /*
1009 * cipher in
1010 * map and adjust cipher len to aead request cryptlen.
1011 * extent is bytes of HMAC postpended to ciphertext,
1012 * typically 12 for ipsec
1013 */
1014 desc->ptr[4].len = cpu_to_be16(cryptlen);
1015 desc->ptr[4].j_extent = authsize;
1016
1017 sg_count = talitos_map_sg(dev, areq->src, edesc->src_nents ? : 1,
1018 (areq->src == areq->dst) ? DMA_BIDIRECTIONAL
1019 : DMA_TO_DEVICE,
1020 edesc->src_is_chained);
1021
1022 if (sg_count == 1) {
1023 to_talitos_ptr(&desc->ptr[4], sg_dma_address(areq->src));
1024 } else {
1025 sg_link_tbl_len = cryptlen;
1026
1027 if (edesc->desc.hdr & DESC_HDR_MODE1_MDEU_CICV)
1028 sg_link_tbl_len = cryptlen + authsize;
1029
1030 sg_count = sg_to_link_tbl(areq->src, sg_count, sg_link_tbl_len,
1031 &edesc->link_tbl[0]);
1032 if (sg_count > 1) {
1033 desc->ptr[4].j_extent |= DESC_PTR_LNKTBL_JUMP;
1034 to_talitos_ptr(&desc->ptr[4], edesc->dma_link_tbl);
1035 dma_sync_single_for_device(dev, edesc->dma_link_tbl,
1036 edesc->dma_len,
1037 DMA_BIDIRECTIONAL);
1038 } else {
1039 /* Only one segment now, so no link tbl needed */
1040 to_talitos_ptr(&desc->ptr[4],
1041 sg_dma_address(areq->src));
1042 }
1043 }
1044
1045 /* cipher out */
1046 desc->ptr[5].len = cpu_to_be16(cryptlen);
1047 desc->ptr[5].j_extent = authsize;
1048
1049 if (areq->src != areq->dst)
1050 sg_count = talitos_map_sg(dev, areq->dst,
1051 edesc->dst_nents ? : 1,
1052 DMA_FROM_DEVICE,
1053 edesc->dst_is_chained);
1054
1055 if (sg_count == 1) {
1056 to_talitos_ptr(&desc->ptr[5], sg_dma_address(areq->dst));
1057 } else {
1058 struct talitos_ptr *link_tbl_ptr =
1059 &edesc->link_tbl[edesc->src_nents + 1];
1060
1061 to_talitos_ptr(&desc->ptr[5], edesc->dma_link_tbl +
1062 (edesc->src_nents + 1) *
1063 sizeof(struct talitos_ptr));
1064 sg_count = sg_to_link_tbl(areq->dst, sg_count, cryptlen,
1065 link_tbl_ptr);
1066
1067 /* Add an entry to the link table for ICV data */
1068 link_tbl_ptr += sg_count - 1;
1069 link_tbl_ptr->j_extent = 0;
1070 sg_count++;
1071 link_tbl_ptr++;
1072 link_tbl_ptr->j_extent = DESC_PTR_LNKTBL_RETURN;
1073 link_tbl_ptr->len = cpu_to_be16(authsize);
1074
1075 /* icv data follows link tables */
1076 to_talitos_ptr(link_tbl_ptr, edesc->dma_link_tbl +
1077 (edesc->src_nents + edesc->dst_nents + 2) *
1078 sizeof(struct talitos_ptr));
1079 desc->ptr[5].j_extent |= DESC_PTR_LNKTBL_JUMP;
1080 dma_sync_single_for_device(ctx->dev, edesc->dma_link_tbl,
1081 edesc->dma_len, DMA_BIDIRECTIONAL);
1082 }
1083
1084 /* iv out */
1085 map_single_talitos_ptr(dev, &desc->ptr[6], ivsize, ctx->iv, 0,
1086 DMA_FROM_DEVICE);
1087
1088 ret = talitos_submit(dev, desc, callback, areq);
1089 if (ret != -EINPROGRESS) {
1090 ipsec_esp_unmap(dev, edesc, areq);
1091 kfree(edesc);
1092 }
1093 return ret;
1094 }
1095
1096 /*
1097 * derive number of elements in scatterlist
1098 */
1099 static int sg_count(struct scatterlist *sg_list, int nbytes, int *chained)
1100 {
1101 struct scatterlist *sg = sg_list;
1102 int sg_nents = 0;
1103
1104 *chained = 0;
1105 while (nbytes > 0) {
1106 sg_nents++;
1107 nbytes -= sg->length;
1108 if (!sg_is_last(sg) && (sg + 1)->length == 0)
1109 *chained = 1;
1110 sg = scatterwalk_sg_next(sg);
1111 }
1112
1113 return sg_nents;
1114 }
1115
1116 /*
1117 * allocate and map the extended descriptor
1118 */
1119 static struct talitos_edesc *talitos_edesc_alloc(struct device *dev,
1120 struct scatterlist *src,
1121 struct scatterlist *dst,
1122 unsigned int cryptlen,
1123 unsigned int authsize,
1124 int icv_stashing,
1125 u32 cryptoflags)
1126 {
1127 struct talitos_edesc *edesc;
1128 int src_nents, dst_nents, alloc_len, dma_len;
1129 int src_chained, dst_chained = 0;
1130 gfp_t flags = cryptoflags & CRYPTO_TFM_REQ_MAY_SLEEP ? GFP_KERNEL :
1131 GFP_ATOMIC;
1132
1133 if (cryptlen + authsize > TALITOS_MAX_DATA_LEN) {
1134 dev_err(dev, "length exceeds h/w max limit\n");
1135 return ERR_PTR(-EINVAL);
1136 }
1137
1138 src_nents = sg_count(src, cryptlen + authsize, &src_chained);
1139 src_nents = (src_nents == 1) ? 0 : src_nents;
1140
1141 if (dst == src) {
1142 dst_nents = src_nents;
1143 } else {
1144 dst_nents = sg_count(dst, cryptlen + authsize, &dst_chained);
1145 dst_nents = (dst_nents == 1) ? 0 : dst_nents;
1146 }
1147
1148 /*
1149 * allocate space for base edesc plus the link tables,
1150 * allowing for two separate entries for ICV and generated ICV (+ 2),
1151 * and the ICV data itself
1152 */
1153 alloc_len = sizeof(struct talitos_edesc);
1154 if (src_nents || dst_nents) {
1155 dma_len = (src_nents + dst_nents + 2) *
1156 sizeof(struct talitos_ptr) + authsize;
1157 alloc_len += dma_len;
1158 } else {
1159 dma_len = 0;
1160 alloc_len += icv_stashing ? authsize : 0;
1161 }
1162
1163 edesc = kmalloc(alloc_len, GFP_DMA | flags);
1164 if (!edesc) {
1165 dev_err(dev, "could not allocate edescriptor\n");
1166 return ERR_PTR(-ENOMEM);
1167 }
1168
1169 edesc->src_nents = src_nents;
1170 edesc->dst_nents = dst_nents;
1171 edesc->src_is_chained = src_chained;
1172 edesc->dst_is_chained = dst_chained;
1173 edesc->dma_len = dma_len;
1174 edesc->dma_link_tbl = dma_map_single(dev, &edesc->link_tbl[0],
1175 edesc->dma_len, DMA_BIDIRECTIONAL);
1176
1177 return edesc;
1178 }
1179
1180 static struct talitos_edesc *aead_edesc_alloc(struct aead_request *areq,
1181 int icv_stashing)
1182 {
1183 struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
1184 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
1185
1186 return talitos_edesc_alloc(ctx->dev, areq->src, areq->dst,
1187 areq->cryptlen, ctx->authsize, icv_stashing,
1188 areq->base.flags);
1189 }
1190
1191 static int aead_encrypt(struct aead_request *req)
1192 {
1193 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
1194 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
1195 struct talitos_edesc *edesc;
1196
1197 /* allocate extended descriptor */
1198 edesc = aead_edesc_alloc(req, 0);
1199 if (IS_ERR(edesc))
1200 return PTR_ERR(edesc);
1201
1202 /* set encrypt */
1203 edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_MODE0_ENCRYPT;
1204
1205 return ipsec_esp(edesc, req, NULL, 0, ipsec_esp_encrypt_done);
1206 }
1207
1208 static int aead_decrypt(struct aead_request *req)
1209 {
1210 struct crypto_aead *authenc = crypto_aead_reqtfm(req);
1211 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
1212 unsigned int authsize = ctx->authsize;
1213 struct talitos_private *priv = dev_get_drvdata(ctx->dev);
1214 struct talitos_edesc *edesc;
1215 struct scatterlist *sg;
1216 void *icvdata;
1217
1218 req->cryptlen -= authsize;
1219
1220 /* allocate extended descriptor */
1221 edesc = aead_edesc_alloc(req, 1);
1222 if (IS_ERR(edesc))
1223 return PTR_ERR(edesc);
1224
1225 if ((priv->features & TALITOS_FTR_HW_AUTH_CHECK) &&
1226 ((!edesc->src_nents && !edesc->dst_nents) ||
1227 priv->features & TALITOS_FTR_SRC_LINK_TBL_LEN_INCLUDES_EXTENT)) {
1228
1229 /* decrypt and check the ICV */
1230 edesc->desc.hdr = ctx->desc_hdr_template |
1231 DESC_HDR_DIR_INBOUND |
1232 DESC_HDR_MODE1_MDEU_CICV;
1233
1234 /* reset integrity check result bits */
1235 edesc->desc.hdr_lo = 0;
1236
1237 return ipsec_esp(edesc, req, NULL, 0,
1238 ipsec_esp_decrypt_hwauth_done);
1239
1240 }
1241
1242 /* Have to check the ICV with software */
1243 edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_DIR_INBOUND;
1244
1245 /* stash incoming ICV for later cmp with ICV generated by the h/w */
1246 if (edesc->dma_len)
1247 icvdata = &edesc->link_tbl[edesc->src_nents +
1248 edesc->dst_nents + 2];
1249 else
1250 icvdata = &edesc->link_tbl[0];
1251
1252 sg = sg_last(req->src, edesc->src_nents ? : 1);
1253
1254 memcpy(icvdata, (char *)sg_virt(sg) + sg->length - ctx->authsize,
1255 ctx->authsize);
1256
1257 return ipsec_esp(edesc, req, NULL, 0, ipsec_esp_decrypt_swauth_done);
1258 }
1259
1260 static int aead_givencrypt(struct aead_givcrypt_request *req)
1261 {
1262 struct aead_request *areq = &req->areq;
1263 struct crypto_aead *authenc = crypto_aead_reqtfm(areq);
1264 struct talitos_ctx *ctx = crypto_aead_ctx(authenc);
1265 struct talitos_edesc *edesc;
1266
1267 /* allocate extended descriptor */
1268 edesc = aead_edesc_alloc(areq, 0);
1269 if (IS_ERR(edesc))
1270 return PTR_ERR(edesc);
1271
1272 /* set encrypt */
1273 edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_MODE0_ENCRYPT;
1274
1275 memcpy(req->giv, ctx->iv, crypto_aead_ivsize(authenc));
1276 /* avoid consecutive packets going out with same IV */
1277 *(__be64 *)req->giv ^= cpu_to_be64(req->seq);
1278
1279 return ipsec_esp(edesc, areq, req->giv, req->seq,
1280 ipsec_esp_encrypt_done);
1281 }
1282
1283 static int ablkcipher_setkey(struct crypto_ablkcipher *cipher,
1284 const u8 *key, unsigned int keylen)
1285 {
1286 struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
1287 struct ablkcipher_alg *alg = crypto_ablkcipher_alg(cipher);
1288
1289 if (keylen > TALITOS_MAX_KEY_SIZE)
1290 goto badkey;
1291
1292 if (keylen < alg->min_keysize || keylen > alg->max_keysize)
1293 goto badkey;
1294
1295 memcpy(&ctx->key, key, keylen);
1296 ctx->keylen = keylen;
1297
1298 return 0;
1299
1300 badkey:
1301 crypto_ablkcipher_set_flags(cipher, CRYPTO_TFM_RES_BAD_KEY_LEN);
1302 return -EINVAL;
1303 }
1304
1305 static void common_nonsnoop_unmap(struct device *dev,
1306 struct talitos_edesc *edesc,
1307 struct ablkcipher_request *areq)
1308 {
1309 unmap_single_talitos_ptr(dev, &edesc->desc.ptr[5], DMA_FROM_DEVICE);
1310 unmap_single_talitos_ptr(dev, &edesc->desc.ptr[2], DMA_TO_DEVICE);
1311 unmap_single_talitos_ptr(dev, &edesc->desc.ptr[1], DMA_TO_DEVICE);
1312
1313 talitos_sg_unmap(dev, edesc, areq->src, areq->dst);
1314
1315 if (edesc->dma_len)
1316 dma_unmap_single(dev, edesc->dma_link_tbl, edesc->dma_len,
1317 DMA_BIDIRECTIONAL);
1318 }
1319
1320 static void ablkcipher_done(struct device *dev,
1321 struct talitos_desc *desc, void *context,
1322 int err)
1323 {
1324 struct ablkcipher_request *areq = context;
1325 struct talitos_edesc *edesc;
1326
1327 edesc = container_of(desc, struct talitos_edesc, desc);
1328
1329 common_nonsnoop_unmap(dev, edesc, areq);
1330
1331 kfree(edesc);
1332
1333 areq->base.complete(&areq->base, err);
1334 }
1335
1336 static int common_nonsnoop(struct talitos_edesc *edesc,
1337 struct ablkcipher_request *areq,
1338 u8 *giv,
1339 void (*callback) (struct device *dev,
1340 struct talitos_desc *desc,
1341 void *context, int error))
1342 {
1343 struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
1344 struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
1345 struct device *dev = ctx->dev;
1346 struct talitos_desc *desc = &edesc->desc;
1347 unsigned int cryptlen = areq->nbytes;
1348 unsigned int ivsize;
1349 int sg_count, ret;
1350
1351 /* first DWORD empty */
1352 desc->ptr[0].len = 0;
1353 to_talitos_ptr(&desc->ptr[0], 0);
1354 desc->ptr[0].j_extent = 0;
1355
1356 /* cipher iv */
1357 ivsize = crypto_ablkcipher_ivsize(cipher);
1358 map_single_talitos_ptr(dev, &desc->ptr[1], ivsize, giv ?: areq->info, 0,
1359 DMA_TO_DEVICE);
1360
1361 /* cipher key */
1362 map_single_talitos_ptr(dev, &desc->ptr[2], ctx->keylen,
1363 (char *)&ctx->key, 0, DMA_TO_DEVICE);
1364
1365 /*
1366 * cipher in
1367 */
1368 desc->ptr[3].len = cpu_to_be16(cryptlen);
1369 desc->ptr[3].j_extent = 0;
1370
1371 sg_count = talitos_map_sg(dev, areq->src, edesc->src_nents ? : 1,
1372 (areq->src == areq->dst) ? DMA_BIDIRECTIONAL
1373 : DMA_TO_DEVICE,
1374 edesc->src_is_chained);
1375
1376 if (sg_count == 1) {
1377 to_talitos_ptr(&desc->ptr[3], sg_dma_address(areq->src));
1378 } else {
1379 sg_count = sg_to_link_tbl(areq->src, sg_count, cryptlen,
1380 &edesc->link_tbl[0]);
1381 if (sg_count > 1) {
1382 to_talitos_ptr(&desc->ptr[3], edesc->dma_link_tbl);
1383 desc->ptr[3].j_extent |= DESC_PTR_LNKTBL_JUMP;
1384 dma_sync_single_for_device(dev, edesc->dma_link_tbl,
1385 edesc->dma_len,
1386 DMA_BIDIRECTIONAL);
1387 } else {
1388 /* Only one segment now, so no link tbl needed */
1389 to_talitos_ptr(&desc->ptr[3],
1390 sg_dma_address(areq->src));
1391 }
1392 }
1393
1394 /* cipher out */
1395 desc->ptr[4].len = cpu_to_be16(cryptlen);
1396 desc->ptr[4].j_extent = 0;
1397
1398 if (areq->src != areq->dst)
1399 sg_count = talitos_map_sg(dev, areq->dst,
1400 edesc->dst_nents ? : 1,
1401 DMA_FROM_DEVICE,
1402 edesc->dst_is_chained);
1403
1404 if (sg_count == 1) {
1405 to_talitos_ptr(&desc->ptr[4], sg_dma_address(areq->dst));
1406 } else {
1407 struct talitos_ptr *link_tbl_ptr =
1408 &edesc->link_tbl[edesc->src_nents + 1];
1409
1410 to_talitos_ptr(&desc->ptr[4], edesc->dma_link_tbl +
1411 (edesc->src_nents + 1) *
1412 sizeof(struct talitos_ptr));
1413 desc->ptr[4].j_extent |= DESC_PTR_LNKTBL_JUMP;
1414 sg_count = sg_to_link_tbl(areq->dst, sg_count, cryptlen,
1415 link_tbl_ptr);
1416 dma_sync_single_for_device(ctx->dev, edesc->dma_link_tbl,
1417 edesc->dma_len, DMA_BIDIRECTIONAL);
1418 }
1419
1420 /* iv out */
1421 map_single_talitos_ptr(dev, &desc->ptr[5], ivsize, ctx->iv, 0,
1422 DMA_FROM_DEVICE);
1423
1424 /* last DWORD empty */
1425 desc->ptr[6].len = 0;
1426 to_talitos_ptr(&desc->ptr[6], 0);
1427 desc->ptr[6].j_extent = 0;
1428
1429 ret = talitos_submit(dev, desc, callback, areq);
1430 if (ret != -EINPROGRESS) {
1431 common_nonsnoop_unmap(dev, edesc, areq);
1432 kfree(edesc);
1433 }
1434 return ret;
1435 }
1436
1437 static struct talitos_edesc *ablkcipher_edesc_alloc(struct ablkcipher_request *
1438 areq)
1439 {
1440 struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
1441 struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
1442
1443 return talitos_edesc_alloc(ctx->dev, areq->src, areq->dst, areq->nbytes,
1444 0, 0, areq->base.flags);
1445 }
1446
1447 static int ablkcipher_encrypt(struct ablkcipher_request *areq)
1448 {
1449 struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
1450 struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
1451 struct talitos_edesc *edesc;
1452
1453 /* allocate extended descriptor */
1454 edesc = ablkcipher_edesc_alloc(areq);
1455 if (IS_ERR(edesc))
1456 return PTR_ERR(edesc);
1457
1458 /* set encrypt */
1459 edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_MODE0_ENCRYPT;
1460
1461 return common_nonsnoop(edesc, areq, NULL, ablkcipher_done);
1462 }
1463
1464 static int ablkcipher_decrypt(struct ablkcipher_request *areq)
1465 {
1466 struct crypto_ablkcipher *cipher = crypto_ablkcipher_reqtfm(areq);
1467 struct talitos_ctx *ctx = crypto_ablkcipher_ctx(cipher);
1468 struct talitos_edesc *edesc;
1469
1470 /* allocate extended descriptor */
1471 edesc = ablkcipher_edesc_alloc(areq);
1472 if (IS_ERR(edesc))
1473 return PTR_ERR(edesc);
1474
1475 edesc->desc.hdr = ctx->desc_hdr_template | DESC_HDR_DIR_INBOUND;
1476
1477 return common_nonsnoop(edesc, areq, NULL, ablkcipher_done);
1478 }
1479
1480 struct talitos_alg_template {
1481 struct crypto_alg alg;
1482 __be32 desc_hdr_template;
1483 };
1484
1485 static struct talitos_alg_template driver_algs[] = {
1486 /* AEAD algorithms. These use a single-pass ipsec_esp descriptor */
1487 {
1488 .alg = {
1489 .cra_name = "authenc(hmac(sha1),cbc(aes))",
1490 .cra_driver_name = "authenc-hmac-sha1-cbc-aes-talitos",
1491 .cra_blocksize = AES_BLOCK_SIZE,
1492 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1493 .cra_type = &crypto_aead_type,
1494 .cra_aead = {
1495 .setkey = aead_setkey,
1496 .setauthsize = aead_setauthsize,
1497 .encrypt = aead_encrypt,
1498 .decrypt = aead_decrypt,
1499 .givencrypt = aead_givencrypt,
1500 .geniv = "<built-in>",
1501 .ivsize = AES_BLOCK_SIZE,
1502 .maxauthsize = SHA1_DIGEST_SIZE,
1503 }
1504 },
1505 .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
1506 DESC_HDR_SEL0_AESU |
1507 DESC_HDR_MODE0_AESU_CBC |
1508 DESC_HDR_SEL1_MDEUA |
1509 DESC_HDR_MODE1_MDEU_INIT |
1510 DESC_HDR_MODE1_MDEU_PAD |
1511 DESC_HDR_MODE1_MDEU_SHA1_HMAC,
1512 },
1513 {
1514 .alg = {
1515 .cra_name = "authenc(hmac(sha1),cbc(des3_ede))",
1516 .cra_driver_name = "authenc-hmac-sha1-cbc-3des-talitos",
1517 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1518 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1519 .cra_type = &crypto_aead_type,
1520 .cra_aead = {
1521 .setkey = aead_setkey,
1522 .setauthsize = aead_setauthsize,
1523 .encrypt = aead_encrypt,
1524 .decrypt = aead_decrypt,
1525 .givencrypt = aead_givencrypt,
1526 .geniv = "<built-in>",
1527 .ivsize = DES3_EDE_BLOCK_SIZE,
1528 .maxauthsize = SHA1_DIGEST_SIZE,
1529 }
1530 },
1531 .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
1532 DESC_HDR_SEL0_DEU |
1533 DESC_HDR_MODE0_DEU_CBC |
1534 DESC_HDR_MODE0_DEU_3DES |
1535 DESC_HDR_SEL1_MDEUA |
1536 DESC_HDR_MODE1_MDEU_INIT |
1537 DESC_HDR_MODE1_MDEU_PAD |
1538 DESC_HDR_MODE1_MDEU_SHA1_HMAC,
1539 },
1540 {
1541 .alg = {
1542 .cra_name = "authenc(hmac(sha256),cbc(aes))",
1543 .cra_driver_name = "authenc-hmac-sha256-cbc-aes-talitos",
1544 .cra_blocksize = AES_BLOCK_SIZE,
1545 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1546 .cra_type = &crypto_aead_type,
1547 .cra_aead = {
1548 .setkey = aead_setkey,
1549 .setauthsize = aead_setauthsize,
1550 .encrypt = aead_encrypt,
1551 .decrypt = aead_decrypt,
1552 .givencrypt = aead_givencrypt,
1553 .geniv = "<built-in>",
1554 .ivsize = AES_BLOCK_SIZE,
1555 .maxauthsize = SHA256_DIGEST_SIZE,
1556 }
1557 },
1558 .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
1559 DESC_HDR_SEL0_AESU |
1560 DESC_HDR_MODE0_AESU_CBC |
1561 DESC_HDR_SEL1_MDEUA |
1562 DESC_HDR_MODE1_MDEU_INIT |
1563 DESC_HDR_MODE1_MDEU_PAD |
1564 DESC_HDR_MODE1_MDEU_SHA256_HMAC,
1565 },
1566 {
1567 .alg = {
1568 .cra_name = "authenc(hmac(sha256),cbc(des3_ede))",
1569 .cra_driver_name = "authenc-hmac-sha256-cbc-3des-talitos",
1570 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1571 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1572 .cra_type = &crypto_aead_type,
1573 .cra_aead = {
1574 .setkey = aead_setkey,
1575 .setauthsize = aead_setauthsize,
1576 .encrypt = aead_encrypt,
1577 .decrypt = aead_decrypt,
1578 .givencrypt = aead_givencrypt,
1579 .geniv = "<built-in>",
1580 .ivsize = DES3_EDE_BLOCK_SIZE,
1581 .maxauthsize = SHA256_DIGEST_SIZE,
1582 }
1583 },
1584 .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
1585 DESC_HDR_SEL0_DEU |
1586 DESC_HDR_MODE0_DEU_CBC |
1587 DESC_HDR_MODE0_DEU_3DES |
1588 DESC_HDR_SEL1_MDEUA |
1589 DESC_HDR_MODE1_MDEU_INIT |
1590 DESC_HDR_MODE1_MDEU_PAD |
1591 DESC_HDR_MODE1_MDEU_SHA256_HMAC,
1592 },
1593 {
1594 .alg = {
1595 .cra_name = "authenc(hmac(md5),cbc(aes))",
1596 .cra_driver_name = "authenc-hmac-md5-cbc-aes-talitos",
1597 .cra_blocksize = AES_BLOCK_SIZE,
1598 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1599 .cra_type = &crypto_aead_type,
1600 .cra_aead = {
1601 .setkey = aead_setkey,
1602 .setauthsize = aead_setauthsize,
1603 .encrypt = aead_encrypt,
1604 .decrypt = aead_decrypt,
1605 .givencrypt = aead_givencrypt,
1606 .geniv = "<built-in>",
1607 .ivsize = AES_BLOCK_SIZE,
1608 .maxauthsize = MD5_DIGEST_SIZE,
1609 }
1610 },
1611 .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
1612 DESC_HDR_SEL0_AESU |
1613 DESC_HDR_MODE0_AESU_CBC |
1614 DESC_HDR_SEL1_MDEUA |
1615 DESC_HDR_MODE1_MDEU_INIT |
1616 DESC_HDR_MODE1_MDEU_PAD |
1617 DESC_HDR_MODE1_MDEU_MD5_HMAC,
1618 },
1619 {
1620 .alg = {
1621 .cra_name = "authenc(hmac(md5),cbc(des3_ede))",
1622 .cra_driver_name = "authenc-hmac-md5-cbc-3des-talitos",
1623 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1624 .cra_flags = CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_ASYNC,
1625 .cra_type = &crypto_aead_type,
1626 .cra_aead = {
1627 .setkey = aead_setkey,
1628 .setauthsize = aead_setauthsize,
1629 .encrypt = aead_encrypt,
1630 .decrypt = aead_decrypt,
1631 .givencrypt = aead_givencrypt,
1632 .geniv = "<built-in>",
1633 .ivsize = DES3_EDE_BLOCK_SIZE,
1634 .maxauthsize = MD5_DIGEST_SIZE,
1635 }
1636 },
1637 .desc_hdr_template = DESC_HDR_TYPE_IPSEC_ESP |
1638 DESC_HDR_SEL0_DEU |
1639 DESC_HDR_MODE0_DEU_CBC |
1640 DESC_HDR_MODE0_DEU_3DES |
1641 DESC_HDR_SEL1_MDEUA |
1642 DESC_HDR_MODE1_MDEU_INIT |
1643 DESC_HDR_MODE1_MDEU_PAD |
1644 DESC_HDR_MODE1_MDEU_MD5_HMAC,
1645 },
1646 /* ABLKCIPHER algorithms. */
1647 {
1648 .alg = {
1649 .cra_name = "cbc(aes)",
1650 .cra_driver_name = "cbc-aes-talitos",
1651 .cra_blocksize = AES_BLOCK_SIZE,
1652 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1653 CRYPTO_ALG_ASYNC,
1654 .cra_type = &crypto_ablkcipher_type,
1655 .cra_ablkcipher = {
1656 .setkey = ablkcipher_setkey,
1657 .encrypt = ablkcipher_encrypt,
1658 .decrypt = ablkcipher_decrypt,
1659 .geniv = "eseqiv",
1660 .min_keysize = AES_MIN_KEY_SIZE,
1661 .max_keysize = AES_MAX_KEY_SIZE,
1662 .ivsize = AES_BLOCK_SIZE,
1663 }
1664 },
1665 .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
1666 DESC_HDR_SEL0_AESU |
1667 DESC_HDR_MODE0_AESU_CBC,
1668 },
1669 {
1670 .alg = {
1671 .cra_name = "cbc(des3_ede)",
1672 .cra_driver_name = "cbc-3des-talitos",
1673 .cra_blocksize = DES3_EDE_BLOCK_SIZE,
1674 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
1675 CRYPTO_ALG_ASYNC,
1676 .cra_type = &crypto_ablkcipher_type,
1677 .cra_ablkcipher = {
1678 .setkey = ablkcipher_setkey,
1679 .encrypt = ablkcipher_encrypt,
1680 .decrypt = ablkcipher_decrypt,
1681 .geniv = "eseqiv",
1682 .min_keysize = DES3_EDE_KEY_SIZE,
1683 .max_keysize = DES3_EDE_KEY_SIZE,
1684 .ivsize = DES3_EDE_BLOCK_SIZE,
1685 }
1686 },
1687 .desc_hdr_template = DESC_HDR_TYPE_COMMON_NONSNOOP_NO_AFEU |
1688 DESC_HDR_SEL0_DEU |
1689 DESC_HDR_MODE0_DEU_CBC |
1690 DESC_HDR_MODE0_DEU_3DES,
1691 }
1692 };
1693
1694 struct talitos_crypto_alg {
1695 struct list_head entry;
1696 struct device *dev;
1697 __be32 desc_hdr_template;
1698 struct crypto_alg crypto_alg;
1699 };
1700
1701 static int talitos_cra_init(struct crypto_tfm *tfm)
1702 {
1703 struct crypto_alg *alg = tfm->__crt_alg;
1704 struct talitos_crypto_alg *talitos_alg;
1705 struct talitos_ctx *ctx = crypto_tfm_ctx(tfm);
1706
1707 talitos_alg = container_of(alg, struct talitos_crypto_alg, crypto_alg);
1708
1709 /* update context with ptr to dev */
1710 ctx->dev = talitos_alg->dev;
1711
1712 /* copy descriptor header template value */
1713 ctx->desc_hdr_template = talitos_alg->desc_hdr_template;
1714
1715 /* random first IV */
1716 get_random_bytes(ctx->iv, TALITOS_MAX_IV_LENGTH);
1717
1718 return 0;
1719 }
1720
1721 /*
1722 * given the alg's descriptor header template, determine whether descriptor
1723 * type and primary/secondary execution units required match the hw
1724 * capabilities description provided in the device tree node.
1725 */
1726 static int hw_supports(struct device *dev, __be32 desc_hdr_template)
1727 {
1728 struct talitos_private *priv = dev_get_drvdata(dev);
1729 int ret;
1730
1731 ret = (1 << DESC_TYPE(desc_hdr_template) & priv->desc_types) &&
1732 (1 << PRIMARY_EU(desc_hdr_template) & priv->exec_units);
1733
1734 if (SECONDARY_EU(desc_hdr_template))
1735 ret = ret && (1 << SECONDARY_EU(desc_hdr_template)
1736 & priv->exec_units);
1737
1738 return ret;
1739 }
1740
1741 static int talitos_remove(struct of_device *ofdev)
1742 {
1743 struct device *dev = &ofdev->dev;
1744 struct talitos_private *priv = dev_get_drvdata(dev);
1745 struct talitos_crypto_alg *t_alg, *n;
1746 int i;
1747
1748 list_for_each_entry_safe(t_alg, n, &priv->alg_list, entry) {
1749 crypto_unregister_alg(&t_alg->crypto_alg);
1750 list_del(&t_alg->entry);
1751 kfree(t_alg);
1752 }
1753
1754 if (hw_supports(dev, DESC_HDR_SEL0_RNG))
1755 talitos_unregister_rng(dev);
1756
1757 for (i = 0; i < priv->num_channels; i++)
1758 if (priv->chan[i].fifo)
1759 kfree(priv->chan[i].fifo);
1760
1761 kfree(priv->chan);
1762
1763 if (priv->irq != NO_IRQ) {
1764 free_irq(priv->irq, dev);
1765 irq_dispose_mapping(priv->irq);
1766 }
1767
1768 tasklet_kill(&priv->done_task);
1769
1770 iounmap(priv->reg);
1771
1772 dev_set_drvdata(dev, NULL);
1773
1774 kfree(priv);
1775
1776 return 0;
1777 }
1778
1779 static struct talitos_crypto_alg *talitos_alg_alloc(struct device *dev,
1780 struct talitos_alg_template
1781 *template)
1782 {
1783 struct talitos_crypto_alg *t_alg;
1784 struct crypto_alg *alg;
1785
1786 t_alg = kzalloc(sizeof(struct talitos_crypto_alg), GFP_KERNEL);
1787 if (!t_alg)
1788 return ERR_PTR(-ENOMEM);
1789
1790 alg = &t_alg->crypto_alg;
1791 *alg = template->alg;
1792
1793 alg->cra_module = THIS_MODULE;
1794 alg->cra_init = talitos_cra_init;
1795 alg->cra_priority = TALITOS_CRA_PRIORITY;
1796 alg->cra_alignmask = 0;
1797 alg->cra_ctxsize = sizeof(struct talitos_ctx);
1798
1799 t_alg->desc_hdr_template = template->desc_hdr_template;
1800 t_alg->dev = dev;
1801
1802 return t_alg;
1803 }
1804
1805 static int talitos_probe(struct of_device *ofdev,
1806 const struct of_device_id *match)
1807 {
1808 struct device *dev = &ofdev->dev;
1809 struct device_node *np = ofdev->node;
1810 struct talitos_private *priv;
1811 const unsigned int *prop;
1812 int i, err;
1813
1814 priv = kzalloc(sizeof(struct talitos_private), GFP_KERNEL);
1815 if (!priv)
1816 return -ENOMEM;
1817
1818 dev_set_drvdata(dev, priv);
1819
1820 priv->ofdev = ofdev;
1821
1822 tasklet_init(&priv->done_task, talitos_done, (unsigned long)dev);
1823
1824 INIT_LIST_HEAD(&priv->alg_list);
1825
1826 priv->irq = irq_of_parse_and_map(np, 0);
1827
1828 if (priv->irq == NO_IRQ) {
1829 dev_err(dev, "failed to map irq\n");
1830 err = -EINVAL;
1831 goto err_out;
1832 }
1833
1834 /* get the irq line */
1835 err = request_irq(priv->irq, talitos_interrupt, 0,
1836 dev_driver_string(dev), dev);
1837 if (err) {
1838 dev_err(dev, "failed to request irq %d\n", priv->irq);
1839 irq_dispose_mapping(priv->irq);
1840 priv->irq = NO_IRQ;
1841 goto err_out;
1842 }
1843
1844 priv->reg = of_iomap(np, 0);
1845 if (!priv->reg) {
1846 dev_err(dev, "failed to of_iomap\n");
1847 err = -ENOMEM;
1848 goto err_out;
1849 }
1850
1851 /* get SEC version capabilities from device tree */
1852 prop = of_get_property(np, "fsl,num-channels", NULL);
1853 if (prop)
1854 priv->num_channels = *prop;
1855
1856 prop = of_get_property(np, "fsl,channel-fifo-len", NULL);
1857 if (prop)
1858 priv->chfifo_len = *prop;
1859
1860 prop = of_get_property(np, "fsl,exec-units-mask", NULL);
1861 if (prop)
1862 priv->exec_units = *prop;
1863
1864 prop = of_get_property(np, "fsl,descriptor-types-mask", NULL);
1865 if (prop)
1866 priv->desc_types = *prop;
1867
1868 if (!is_power_of_2(priv->num_channels) || !priv->chfifo_len ||
1869 !priv->exec_units || !priv->desc_types) {
1870 dev_err(dev, "invalid property data in device tree node\n");
1871 err = -EINVAL;
1872 goto err_out;
1873 }
1874
1875 if (of_device_is_compatible(np, "fsl,sec3.0"))
1876 priv->features |= TALITOS_FTR_SRC_LINK_TBL_LEN_INCLUDES_EXTENT;
1877
1878 if (of_device_is_compatible(np, "fsl,sec2.1"))
1879 priv->features |= TALITOS_FTR_HW_AUTH_CHECK;
1880
1881 priv->chan = kzalloc(sizeof(struct talitos_channel) *
1882 priv->num_channels, GFP_KERNEL);
1883 if (!priv->chan) {
1884 dev_err(dev, "failed to allocate channel management space\n");
1885 err = -ENOMEM;
1886 goto err_out;
1887 }
1888
1889 for (i = 0; i < priv->num_channels; i++) {
1890 spin_lock_init(&priv->chan[i].head_lock);
1891 spin_lock_init(&priv->chan[i].tail_lock);
1892 }
1893
1894 priv->fifo_len = roundup_pow_of_two(priv->chfifo_len);
1895
1896 for (i = 0; i < priv->num_channels; i++) {
1897 priv->chan[i].fifo = kzalloc(sizeof(struct talitos_request) *
1898 priv->fifo_len, GFP_KERNEL);
1899 if (!priv->chan[i].fifo) {
1900 dev_err(dev, "failed to allocate request fifo %d\n", i);
1901 err = -ENOMEM;
1902 goto err_out;
1903 }
1904 }
1905
1906 for (i = 0; i < priv->num_channels; i++)
1907 atomic_set(&priv->chan[i].submit_count,
1908 -(priv->chfifo_len - 1));
1909
1910 dma_set_mask(dev, DMA_BIT_MASK(36));
1911
1912 /* reset and initialize the h/w */
1913 err = init_device(dev);
1914 if (err) {
1915 dev_err(dev, "failed to initialize device\n");
1916 goto err_out;
1917 }
1918
1919 /* register the RNG, if available */
1920 if (hw_supports(dev, DESC_HDR_SEL0_RNG)) {
1921 err = talitos_register_rng(dev);
1922 if (err) {
1923 dev_err(dev, "failed to register hwrng: %d\n", err);
1924 goto err_out;
1925 } else
1926 dev_info(dev, "hwrng\n");
1927 }
1928
1929 /* register crypto algorithms the device supports */
1930 for (i = 0; i < ARRAY_SIZE(driver_algs); i++) {
1931 if (hw_supports(dev, driver_algs[i].desc_hdr_template)) {
1932 struct talitos_crypto_alg *t_alg;
1933
1934 t_alg = talitos_alg_alloc(dev, &driver_algs[i]);
1935 if (IS_ERR(t_alg)) {
1936 err = PTR_ERR(t_alg);
1937 goto err_out;
1938 }
1939
1940 err = crypto_register_alg(&t_alg->crypto_alg);
1941 if (err) {
1942 dev_err(dev, "%s alg registration failed\n",
1943 t_alg->crypto_alg.cra_driver_name);
1944 kfree(t_alg);
1945 } else {
1946 list_add_tail(&t_alg->entry, &priv->alg_list);
1947 dev_info(dev, "%s\n",
1948 t_alg->crypto_alg.cra_driver_name);
1949 }
1950 }
1951 }
1952
1953 return 0;
1954
1955 err_out:
1956 talitos_remove(ofdev);
1957
1958 return err;
1959 }
1960
1961 static struct of_device_id talitos_match[] = {
1962 {
1963 .compatible = "fsl,sec2.0",
1964 },
1965 {},
1966 };
1967 MODULE_DEVICE_TABLE(of, talitos_match);
1968
1969 static struct of_platform_driver talitos_driver = {
1970 .name = "talitos",
1971 .match_table = talitos_match,
1972 .probe = talitos_probe,
1973 .remove = talitos_remove,
1974 };
1975
1976 static int __init talitos_init(void)
1977 {
1978 return of_register_platform_driver(&talitos_driver);
1979 }
1980 module_init(talitos_init);
1981
1982 static void __exit talitos_exit(void)
1983 {
1984 of_unregister_platform_driver(&talitos_driver);
1985 }
1986 module_exit(talitos_exit);
1987
1988 MODULE_LICENSE("GPL");
1989 MODULE_AUTHOR("Kim Phillips <kim.phillips@freescale.com>");
1990 MODULE_DESCRIPTION("Freescale integrated security engine (SEC) driver");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree