Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/crypto/atmel-tdes.c

  1 /*
  2  * Cryptographic API.
  3  *
  4  * Support for ATMEL DES/TDES HW acceleration.
  5  *
  6  * Copyright (c) 2012 Eukréa Electromatique - ATMEL
  7  * Author: Nicolas Royer <nicolas@eukrea.com>
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as published
 11  * by the Free Software Foundation.
 12  *
 13  * Some ideas are from omap-aes.c drivers.
 14  */
 15 
 16 
 17 #include <linux/kernel.h>
 18 #include <linux/module.h>
 19 #include <linux/slab.h>
 20 #include <linux/err.h>
 21 #include <linux/clk.h>
 22 #include <linux/io.h>
 23 #include <linux/hw_random.h>
 24 #include <linux/platform_device.h>
 25 
 26 #include <linux/device.h>
 27 #include <linux/init.h>
 28 #include <linux/errno.h>
 29 #include <linux/interrupt.h>
 30 #include <linux/irq.h>
 31 #include <linux/scatterlist.h>
 32 #include <linux/dma-mapping.h>
 33 #include <linux/of_device.h>
 34 #include <linux/delay.h>
 35 #include <linux/crypto.h>
 36 #include <linux/cryptohash.h>
 37 #include <crypto/scatterwalk.h>
 38 #include <crypto/algapi.h>
 39 #include <crypto/des.h>
 40 #include <crypto/hash.h>
 41 #include <crypto/internal/hash.h>
 42 #include <linux/platform_data/crypto-atmel.h>
 43 #include "atmel-tdes-regs.h"
 44 
 45 /* TDES flags  */
 46 #define TDES_FLAGS_MODE_MASK            0x00ff
 47 #define TDES_FLAGS_ENCRYPT      BIT(0)
 48 #define TDES_FLAGS_CBC          BIT(1)
 49 #define TDES_FLAGS_CFB          BIT(2)
 50 #define TDES_FLAGS_CFB8         BIT(3)
 51 #define TDES_FLAGS_CFB16        BIT(4)
 52 #define TDES_FLAGS_CFB32        BIT(5)
 53 #define TDES_FLAGS_CFB64        BIT(6)
 54 #define TDES_FLAGS_OFB          BIT(7)
 55 
 56 #define TDES_FLAGS_INIT         BIT(16)
 57 #define TDES_FLAGS_FAST         BIT(17)
 58 #define TDES_FLAGS_BUSY         BIT(18)
 59 #define TDES_FLAGS_DMA          BIT(19)
 60 
 61 #define ATMEL_TDES_QUEUE_LENGTH 50
 62 
 63 #define CFB8_BLOCK_SIZE         1
 64 #define CFB16_BLOCK_SIZE        2
 65 #define CFB32_BLOCK_SIZE        4
 66 
 67 struct atmel_tdes_caps {
 68         bool    has_dma;
 69         u32             has_cfb_3keys;
 70 };
 71 
 72 struct atmel_tdes_dev;
 73 
 74 struct atmel_tdes_ctx {
 75         struct atmel_tdes_dev *dd;
 76 
 77         int             keylen;
 78         u32             key[3*DES_KEY_SIZE / sizeof(u32)];
 79         unsigned long   flags;
 80 
 81         u16             block_size;
 82 };
 83 
 84 struct atmel_tdes_reqctx {
 85         unsigned long mode;
 86 };
 87 
 88 struct atmel_tdes_dma {
 89         struct dma_chan                 *chan;
 90         struct dma_slave_config dma_conf;
 91 };
 92 
 93 struct atmel_tdes_dev {
 94         struct list_head        list;
 95         unsigned long           phys_base;
 96         void __iomem            *io_base;
 97 
 98         struct atmel_tdes_ctx   *ctx;
 99         struct device           *dev;
100         struct clk                      *iclk;
101         int                                     irq;
102 
103         unsigned long           flags;
104         int                     err;
105 
106         spinlock_t              lock;
107         struct crypto_queue     queue;
108 
109         struct tasklet_struct   done_task;
110         struct tasklet_struct   queue_task;
111 
112         struct ablkcipher_request       *req;
113         size_t                          total;
114 
115         struct scatterlist      *in_sg;
116         unsigned int            nb_in_sg;
117         size_t                          in_offset;
118         struct scatterlist      *out_sg;
119         unsigned int            nb_out_sg;
120         size_t                          out_offset;
121 
122         size_t  buflen;
123         size_t  dma_size;
124 
125         void    *buf_in;
126         int             dma_in;
127         dma_addr_t      dma_addr_in;
128         struct atmel_tdes_dma   dma_lch_in;
129 
130         void    *buf_out;
131         int             dma_out;
132         dma_addr_t      dma_addr_out;
133         struct atmel_tdes_dma   dma_lch_out;
134 
135         struct atmel_tdes_caps  caps;
136 
137         u32     hw_version;
138 };
139 
140 struct atmel_tdes_drv {
141         struct list_head        dev_list;
142         spinlock_t              lock;
143 };
144 
145 static struct atmel_tdes_drv atmel_tdes = {
146         .dev_list = LIST_HEAD_INIT(atmel_tdes.dev_list),
147         .lock = __SPIN_LOCK_UNLOCKED(atmel_tdes.lock),
148 };
149 
150 static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset,
151                         void *buf, size_t buflen, size_t total, int out)
152 {
153         unsigned int count, off = 0;
154 
155         while (buflen && total) {
156                 count = min((*sg)->length - *offset, total);
157                 count = min(count, buflen);
158 
159                 if (!count)
160                         return off;
161 
162                 scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out);
163 
164                 off += count;
165                 buflen -= count;
166                 *offset += count;
167                 total -= count;
168 
169                 if (*offset == (*sg)->length) {
170                         *sg = sg_next(*sg);
171                         if (*sg)
172                                 *offset = 0;
173                         else
174                                 total = 0;
175                 }
176         }
177 
178         return off;
179 }
180 
181 static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset)
182 {
183         return readl_relaxed(dd->io_base + offset);
184 }
185 
186 static inline void atmel_tdes_write(struct atmel_tdes_dev *dd,
187                                         u32 offset, u32 value)
188 {
189         writel_relaxed(value, dd->io_base + offset);
190 }
191 
192 static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset,
193                                         u32 *value, int count)
194 {
195         for (; count--; value++, offset += 4)
196                 atmel_tdes_write(dd, offset, *value);
197 }
198 
199 static struct atmel_tdes_dev *atmel_tdes_find_dev(struct atmel_tdes_ctx *ctx)
200 {
201         struct atmel_tdes_dev *tdes_dd = NULL;
202         struct atmel_tdes_dev *tmp;
203 
204         spin_lock_bh(&atmel_tdes.lock);
205         if (!ctx->dd) {
206                 list_for_each_entry(tmp, &atmel_tdes.dev_list, list) {
207                         tdes_dd = tmp;
208                         break;
209                 }
210                 ctx->dd = tdes_dd;
211         } else {
212                 tdes_dd = ctx->dd;
213         }
214         spin_unlock_bh(&atmel_tdes.lock);
215 
216         return tdes_dd;
217 }
218 
219 static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd)
220 {
221         clk_prepare_enable(dd->iclk);
222 
223         if (!(dd->flags & TDES_FLAGS_INIT)) {
224                 atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST);
225                 dd->flags |= TDES_FLAGS_INIT;
226                 dd->err = 0;
227         }
228 
229         return 0;
230 }
231 
232 static inline unsigned int atmel_tdes_get_version(struct atmel_tdes_dev *dd)
233 {
234         return atmel_tdes_read(dd, TDES_HW_VERSION) & 0x00000fff;
235 }
236 
237 static void atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd)
238 {
239         atmel_tdes_hw_init(dd);
240 
241         dd->hw_version = atmel_tdes_get_version(dd);
242 
243         dev_info(dd->dev,
244                         "version: 0x%x\n", dd->hw_version);
245 
246         clk_disable_unprepare(dd->iclk);
247 }
248 
249 static void atmel_tdes_dma_callback(void *data)
250 {
251         struct atmel_tdes_dev *dd = data;
252 
253         /* dma_lch_out - completed */
254         tasklet_schedule(&dd->done_task);
255 }
256 
257 static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd)
258 {
259         int err;
260         u32 valcr = 0, valmr = TDES_MR_SMOD_PDC;
261 
262         err = atmel_tdes_hw_init(dd);
263 
264         if (err)
265                 return err;
266 
267         if (!dd->caps.has_dma)
268                 atmel_tdes_write(dd, TDES_PTCR,
269                         TDES_PTCR_TXTDIS | TDES_PTCR_RXTDIS);
270 
271         /* MR register must be set before IV registers */
272         if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) {
273                 valmr |= TDES_MR_KEYMOD_3KEY;
274                 valmr |= TDES_MR_TDESMOD_TDES;
275         } else if (dd->ctx->keylen > DES_KEY_SIZE) {
276                 valmr |= TDES_MR_KEYMOD_2KEY;
277                 valmr |= TDES_MR_TDESMOD_TDES;
278         } else {
279                 valmr |= TDES_MR_TDESMOD_DES;
280         }
281 
282         if (dd->flags & TDES_FLAGS_CBC) {
283                 valmr |= TDES_MR_OPMOD_CBC;
284         } else if (dd->flags & TDES_FLAGS_CFB) {
285                 valmr |= TDES_MR_OPMOD_CFB;
286 
287                 if (dd->flags & TDES_FLAGS_CFB8)
288                         valmr |= TDES_MR_CFBS_8b;
289                 else if (dd->flags & TDES_FLAGS_CFB16)
290                         valmr |= TDES_MR_CFBS_16b;
291                 else if (dd->flags & TDES_FLAGS_CFB32)
292                         valmr |= TDES_MR_CFBS_32b;
293                 else if (dd->flags & TDES_FLAGS_CFB64)
294                         valmr |= TDES_MR_CFBS_64b;
295         } else if (dd->flags & TDES_FLAGS_OFB) {
296                 valmr |= TDES_MR_OPMOD_OFB;
297         }
298 
299         if ((dd->flags & TDES_FLAGS_ENCRYPT) || (dd->flags & TDES_FLAGS_OFB))
300                 valmr |= TDES_MR_CYPHER_ENC;
301 
302         atmel_tdes_write(dd, TDES_CR, valcr);
303         atmel_tdes_write(dd, TDES_MR, valmr);
304 
305         atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key,
306                                                 dd->ctx->keylen >> 2);
307 
308         if (((dd->flags & TDES_FLAGS_CBC) || (dd->flags & TDES_FLAGS_CFB) ||
309                 (dd->flags & TDES_FLAGS_OFB)) && dd->req->info) {
310                 atmel_tdes_write_n(dd, TDES_IV1R, dd->req->info, 2);
311         }
312 
313         return 0;
314 }
315 
316 static int atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev *dd)
317 {
318         int err = 0;
319         size_t count;
320 
321         atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
322 
323         if (dd->flags & TDES_FLAGS_FAST) {
324                 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
325                 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
326         } else {
327                 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
328                                            dd->dma_size, DMA_FROM_DEVICE);
329 
330                 /* copy data */
331                 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
332                                 dd->buf_out, dd->buflen, dd->dma_size, 1);
333                 if (count != dd->dma_size) {
334                         err = -EINVAL;
335                         pr_err("not all data converted: %u\n", count);
336                 }
337         }
338 
339         return err;
340 }
341 
342 static int atmel_tdes_buff_init(struct atmel_tdes_dev *dd)
343 {
344         int err = -ENOMEM;
345 
346         dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0);
347         dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0);
348         dd->buflen = PAGE_SIZE;
349         dd->buflen &= ~(DES_BLOCK_SIZE - 1);
350 
351         if (!dd->buf_in || !dd->buf_out) {
352                 dev_err(dd->dev, "unable to alloc pages.\n");
353                 goto err_alloc;
354         }
355 
356         /* MAP here */
357         dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in,
358                                         dd->buflen, DMA_TO_DEVICE);
359         if (dma_mapping_error(dd->dev, dd->dma_addr_in)) {
360                 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
361                 err = -EINVAL;
362                 goto err_map_in;
363         }
364 
365         dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
366                                         dd->buflen, DMA_FROM_DEVICE);
367         if (dma_mapping_error(dd->dev, dd->dma_addr_out)) {
368                 dev_err(dd->dev, "dma %d bytes error\n", dd->buflen);
369                 err = -EINVAL;
370                 goto err_map_out;
371         }
372 
373         return 0;
374 
375 err_map_out:
376         dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
377                 DMA_TO_DEVICE);
378 err_map_in:
379         free_page((unsigned long)dd->buf_out);
380         free_page((unsigned long)dd->buf_in);
381 err_alloc:
382         if (err)
383                 pr_err("error: %d\n", err);
384         return err;
385 }
386 
387 static void atmel_tdes_buff_cleanup(struct atmel_tdes_dev *dd)
388 {
389         dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
390                          DMA_FROM_DEVICE);
391         dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
392                 DMA_TO_DEVICE);
393         free_page((unsigned long)dd->buf_out);
394         free_page((unsigned long)dd->buf_in);
395 }
396 
397 static int atmel_tdes_crypt_pdc(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
398                                dma_addr_t dma_addr_out, int length)
399 {
400         struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
401         struct atmel_tdes_dev *dd = ctx->dd;
402         int len32;
403 
404         dd->dma_size = length;
405 
406         if (!(dd->flags & TDES_FLAGS_FAST)) {
407                 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
408                                            DMA_TO_DEVICE);
409         }
410 
411         if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB8))
412                 len32 = DIV_ROUND_UP(length, sizeof(u8));
413         else if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB16))
414                 len32 = DIV_ROUND_UP(length, sizeof(u16));
415         else
416                 len32 = DIV_ROUND_UP(length, sizeof(u32));
417 
418         atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
419         atmel_tdes_write(dd, TDES_TPR, dma_addr_in);
420         atmel_tdes_write(dd, TDES_TCR, len32);
421         atmel_tdes_write(dd, TDES_RPR, dma_addr_out);
422         atmel_tdes_write(dd, TDES_RCR, len32);
423 
424         /* Enable Interrupt */
425         atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX);
426 
427         /* Start DMA transfer */
428         atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN);
429 
430         return 0;
431 }
432 
433 static int atmel_tdes_crypt_dma(struct crypto_tfm *tfm, dma_addr_t dma_addr_in,
434                                dma_addr_t dma_addr_out, int length)
435 {
436         struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
437         struct atmel_tdes_dev *dd = ctx->dd;
438         struct scatterlist sg[2];
439         struct dma_async_tx_descriptor  *in_desc, *out_desc;
440 
441         dd->dma_size = length;
442 
443         if (!(dd->flags & TDES_FLAGS_FAST)) {
444                 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
445                                            DMA_TO_DEVICE);
446         }
447 
448         if (dd->flags & TDES_FLAGS_CFB8) {
449                 dd->dma_lch_in.dma_conf.dst_addr_width =
450                         DMA_SLAVE_BUSWIDTH_1_BYTE;
451                 dd->dma_lch_out.dma_conf.src_addr_width =
452                         DMA_SLAVE_BUSWIDTH_1_BYTE;
453         } else if (dd->flags & TDES_FLAGS_CFB16) {
454                 dd->dma_lch_in.dma_conf.dst_addr_width =
455                         DMA_SLAVE_BUSWIDTH_2_BYTES;
456                 dd->dma_lch_out.dma_conf.src_addr_width =
457                         DMA_SLAVE_BUSWIDTH_2_BYTES;
458         } else {
459                 dd->dma_lch_in.dma_conf.dst_addr_width =
460                         DMA_SLAVE_BUSWIDTH_4_BYTES;
461                 dd->dma_lch_out.dma_conf.src_addr_width =
462                         DMA_SLAVE_BUSWIDTH_4_BYTES;
463         }
464 
465         dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
466         dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf);
467 
468         dd->flags |= TDES_FLAGS_DMA;
469 
470         sg_init_table(&sg[0], 1);
471         sg_dma_address(&sg[0]) = dma_addr_in;
472         sg_dma_len(&sg[0]) = length;
473 
474         sg_init_table(&sg[1], 1);
475         sg_dma_address(&sg[1]) = dma_addr_out;
476         sg_dma_len(&sg[1]) = length;
477 
478         in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0],
479                                 1, DMA_MEM_TO_DEV,
480                                 DMA_PREP_INTERRUPT  |  DMA_CTRL_ACK);
481         if (!in_desc)
482                 return -EINVAL;
483 
484         out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1],
485                                 1, DMA_DEV_TO_MEM,
486                                 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
487         if (!out_desc)
488                 return -EINVAL;
489 
490         out_desc->callback = atmel_tdes_dma_callback;
491         out_desc->callback_param = dd;
492 
493         dmaengine_submit(out_desc);
494         dma_async_issue_pending(dd->dma_lch_out.chan);
495 
496         dmaengine_submit(in_desc);
497         dma_async_issue_pending(dd->dma_lch_in.chan);
498 
499         return 0;
500 }
501 
502 static int atmel_tdes_crypt_start(struct atmel_tdes_dev *dd)
503 {
504         struct crypto_tfm *tfm = crypto_ablkcipher_tfm(
505                                         crypto_ablkcipher_reqtfm(dd->req));
506         int err, fast = 0, in, out;
507         size_t count;
508         dma_addr_t addr_in, addr_out;
509 
510         if ((!dd->in_offset) && (!dd->out_offset)) {
511                 /* check for alignment */
512                 in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) &&
513                         IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size);
514                 out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) &&
515                         IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size);
516                 fast = in && out;
517 
518                 if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg))
519                         fast = 0;
520         }
521 
522 
523         if (fast)  {
524                 count = min(dd->total, sg_dma_len(dd->in_sg));
525                 count = min(count, sg_dma_len(dd->out_sg));
526 
527                 err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
528                 if (!err) {
529                         dev_err(dd->dev, "dma_map_sg() error\n");
530                         return -EINVAL;
531                 }
532 
533                 err = dma_map_sg(dd->dev, dd->out_sg, 1,
534                                 DMA_FROM_DEVICE);
535                 if (!err) {
536                         dev_err(dd->dev, "dma_map_sg() error\n");
537                         dma_unmap_sg(dd->dev, dd->in_sg, 1,
538                                 DMA_TO_DEVICE);
539                         return -EINVAL;
540                 }
541 
542                 addr_in = sg_dma_address(dd->in_sg);
543                 addr_out = sg_dma_address(dd->out_sg);
544 
545                 dd->flags |= TDES_FLAGS_FAST;
546 
547         } else {
548                 /* use cache buffers */
549                 count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset,
550                                 dd->buf_in, dd->buflen, dd->total, 0);
551 
552                 addr_in = dd->dma_addr_in;
553                 addr_out = dd->dma_addr_out;
554 
555                 dd->flags &= ~TDES_FLAGS_FAST;
556         }
557 
558         dd->total -= count;
559 
560         if (dd->caps.has_dma)
561                 err = atmel_tdes_crypt_dma(tfm, addr_in, addr_out, count);
562         else
563                 err = atmel_tdes_crypt_pdc(tfm, addr_in, addr_out, count);
564 
565         if (err && (dd->flags & TDES_FLAGS_FAST)) {
566                 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
567                 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
568         }
569 
570         return err;
571 }
572 
573 static void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err)
574 {
575         struct ablkcipher_request *req = dd->req;
576 
577         clk_disable_unprepare(dd->iclk);
578 
579         dd->flags &= ~TDES_FLAGS_BUSY;
580 
581         req->base.complete(&req->base, err);
582 }
583 
584 static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd,
585                                struct ablkcipher_request *req)
586 {
587         struct crypto_async_request *async_req, *backlog;
588         struct atmel_tdes_ctx *ctx;
589         struct atmel_tdes_reqctx *rctx;
590         unsigned long flags;
591         int err, ret = 0;
592 
593         spin_lock_irqsave(&dd->lock, flags);
594         if (req)
595                 ret = ablkcipher_enqueue_request(&dd->queue, req);
596         if (dd->flags & TDES_FLAGS_BUSY) {
597                 spin_unlock_irqrestore(&dd->lock, flags);
598                 return ret;
599         }
600         backlog = crypto_get_backlog(&dd->queue);
601         async_req = crypto_dequeue_request(&dd->queue);
602         if (async_req)
603                 dd->flags |= TDES_FLAGS_BUSY;
604         spin_unlock_irqrestore(&dd->lock, flags);
605 
606         if (!async_req)
607                 return ret;
608 
609         if (backlog)
610                 backlog->complete(backlog, -EINPROGRESS);
611 
612         req = ablkcipher_request_cast(async_req);
613 
614         /* assign new request to device */
615         dd->req = req;
616         dd->total = req->nbytes;
617         dd->in_offset = 0;
618         dd->in_sg = req->src;
619         dd->out_offset = 0;
620         dd->out_sg = req->dst;
621 
622         rctx = ablkcipher_request_ctx(req);
623         ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
624         rctx->mode &= TDES_FLAGS_MODE_MASK;
625         dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode;
626         dd->ctx = ctx;
627         ctx->dd = dd;
628 
629         err = atmel_tdes_write_ctrl(dd);
630         if (!err)
631                 err = atmel_tdes_crypt_start(dd);
632         if (err) {
633                 /* des_task will not finish it, so do it here */
634                 atmel_tdes_finish_req(dd, err);
635                 tasklet_schedule(&dd->queue_task);
636         }
637 
638         return ret;
639 }
640 
641 static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd)
642 {
643         int err = -EINVAL;
644         size_t count;
645 
646         if (dd->flags & TDES_FLAGS_DMA) {
647                 err = 0;
648                 if  (dd->flags & TDES_FLAGS_FAST) {
649                         dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
650                         dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
651                 } else {
652                         dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
653                                 dd->dma_size, DMA_FROM_DEVICE);
654 
655                         /* copy data */
656                         count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
657                                 dd->buf_out, dd->buflen, dd->dma_size, 1);
658                         if (count != dd->dma_size) {
659                                 err = -EINVAL;
660                                 pr_err("not all data converted: %u\n", count);
661                         }
662                 }
663         }
664         return err;
665 }
666 
667 static int atmel_tdes_crypt(struct ablkcipher_request *req, unsigned long mode)
668 {
669         struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(
670                         crypto_ablkcipher_reqtfm(req));
671         struct atmel_tdes_reqctx *rctx = ablkcipher_request_ctx(req);
672 
673         if (mode & TDES_FLAGS_CFB8) {
674                 if (!IS_ALIGNED(req->nbytes, CFB8_BLOCK_SIZE)) {
675                         pr_err("request size is not exact amount of CFB8 blocks\n");
676                         return -EINVAL;
677                 }
678                 ctx->block_size = CFB8_BLOCK_SIZE;
679         } else if (mode & TDES_FLAGS_CFB16) {
680                 if (!IS_ALIGNED(req->nbytes, CFB16_BLOCK_SIZE)) {
681                         pr_err("request size is not exact amount of CFB16 blocks\n");
682                         return -EINVAL;
683                 }
684                 ctx->block_size = CFB16_BLOCK_SIZE;
685         } else if (mode & TDES_FLAGS_CFB32) {
686                 if (!IS_ALIGNED(req->nbytes, CFB32_BLOCK_SIZE)) {
687                         pr_err("request size is not exact amount of CFB32 blocks\n");
688                         return -EINVAL;
689                 }
690                 ctx->block_size = CFB32_BLOCK_SIZE;
691         } else {
692                 if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) {
693                         pr_err("request size is not exact amount of DES blocks\n");
694                         return -EINVAL;
695                 }
696                 ctx->block_size = DES_BLOCK_SIZE;
697         }
698 
699         rctx->mode = mode;
700 
701         return atmel_tdes_handle_queue(ctx->dd, req);
702 }
703 
704 static bool atmel_tdes_filter(struct dma_chan *chan, void *slave)
705 {
706         struct at_dma_slave     *sl = slave;
707 
708         if (sl && sl->dma_dev == chan->device->dev) {
709                 chan->private = sl;
710                 return true;
711         } else {
712                 return false;
713         }
714 }
715 
716 static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd,
717                         struct crypto_platform_data *pdata)
718 {
719         int err = -ENOMEM;
720         dma_cap_mask_t mask;
721 
722         dma_cap_zero(mask);
723         dma_cap_set(DMA_SLAVE, mask);
724 
725         /* Try to grab 2 DMA channels */
726         dd->dma_lch_in.chan = dma_request_slave_channel_compat(mask,
727                         atmel_tdes_filter, &pdata->dma_slave->rxdata, dd->dev, "tx");
728         if (!dd->dma_lch_in.chan)
729                 goto err_dma_in;
730 
731         dd->dma_lch_in.dma_conf.direction = DMA_MEM_TO_DEV;
732         dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
733                 TDES_IDATA1R;
734         dd->dma_lch_in.dma_conf.src_maxburst = 1;
735         dd->dma_lch_in.dma_conf.src_addr_width =
736                 DMA_SLAVE_BUSWIDTH_4_BYTES;
737         dd->dma_lch_in.dma_conf.dst_maxburst = 1;
738         dd->dma_lch_in.dma_conf.dst_addr_width =
739                 DMA_SLAVE_BUSWIDTH_4_BYTES;
740         dd->dma_lch_in.dma_conf.device_fc = false;
741 
742         dd->dma_lch_out.chan = dma_request_slave_channel_compat(mask,
743                         atmel_tdes_filter, &pdata->dma_slave->txdata, dd->dev, "rx");
744         if (!dd->dma_lch_out.chan)
745                 goto err_dma_out;
746 
747         dd->dma_lch_out.dma_conf.direction = DMA_DEV_TO_MEM;
748         dd->dma_lch_out.dma_conf.src_addr = dd->phys_base +
749                 TDES_ODATA1R;
750         dd->dma_lch_out.dma_conf.src_maxburst = 1;
751         dd->dma_lch_out.dma_conf.src_addr_width =
752                 DMA_SLAVE_BUSWIDTH_4_BYTES;
753         dd->dma_lch_out.dma_conf.dst_maxburst = 1;
754         dd->dma_lch_out.dma_conf.dst_addr_width =
755                 DMA_SLAVE_BUSWIDTH_4_BYTES;
756         dd->dma_lch_out.dma_conf.device_fc = false;
757 
758         return 0;
759 
760 err_dma_out:
761         dma_release_channel(dd->dma_lch_in.chan);
762 err_dma_in:
763         dev_warn(dd->dev, "no DMA channel available\n");
764         return err;
765 }
766 
767 static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd)
768 {
769         dma_release_channel(dd->dma_lch_in.chan);
770         dma_release_channel(dd->dma_lch_out.chan);
771 }
772 
773 static int atmel_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
774                            unsigned int keylen)
775 {
776         u32 tmp[DES_EXPKEY_WORDS];
777         int err;
778         struct crypto_tfm *ctfm = crypto_ablkcipher_tfm(tfm);
779 
780         struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
781 
782         if (keylen != DES_KEY_SIZE) {
783                 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
784                 return -EINVAL;
785         }
786 
787         err = des_ekey(tmp, key);
788         if (err == 0 && (ctfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) {
789                 ctfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY;
790                 return -EINVAL;
791         }
792 
793         memcpy(ctx->key, key, keylen);
794         ctx->keylen = keylen;
795 
796         return 0;
797 }
798 
799 static int atmel_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
800                            unsigned int keylen)
801 {
802         struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
803         const char *alg_name;
804 
805         alg_name = crypto_tfm_alg_name(crypto_ablkcipher_tfm(tfm));
806 
807         /*
808          * HW bug in cfb 3-keys mode.
809          */
810         if (!ctx->dd->caps.has_cfb_3keys && strstr(alg_name, "cfb")
811                         && (keylen != 2*DES_KEY_SIZE)) {
812                 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
813                 return -EINVAL;
814         } else if ((keylen != 2*DES_KEY_SIZE) && (keylen != 3*DES_KEY_SIZE)) {
815                 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
816                 return -EINVAL;
817         }
818 
819         memcpy(ctx->key, key, keylen);
820         ctx->keylen = keylen;
821 
822         return 0;
823 }
824 
825 static int atmel_tdes_ecb_encrypt(struct ablkcipher_request *req)
826 {
827         return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT);
828 }
829 
830 static int atmel_tdes_ecb_decrypt(struct ablkcipher_request *req)
831 {
832         return atmel_tdes_crypt(req, 0);
833 }
834 
835 static int atmel_tdes_cbc_encrypt(struct ablkcipher_request *req)
836 {
837         return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CBC);
838 }
839 
840 static int atmel_tdes_cbc_decrypt(struct ablkcipher_request *req)
841 {
842         return atmel_tdes_crypt(req, TDES_FLAGS_CBC);
843 }
844 static int atmel_tdes_cfb_encrypt(struct ablkcipher_request *req)
845 {
846         return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB);
847 }
848 
849 static int atmel_tdes_cfb_decrypt(struct ablkcipher_request *req)
850 {
851         return atmel_tdes_crypt(req, TDES_FLAGS_CFB);
852 }
853 
854 static int atmel_tdes_cfb8_encrypt(struct ablkcipher_request *req)
855 {
856         return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
857                                                 TDES_FLAGS_CFB8);
858 }
859 
860 static int atmel_tdes_cfb8_decrypt(struct ablkcipher_request *req)
861 {
862         return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB8);
863 }
864 
865 static int atmel_tdes_cfb16_encrypt(struct ablkcipher_request *req)
866 {
867         return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
868                                                 TDES_FLAGS_CFB16);
869 }
870 
871 static int atmel_tdes_cfb16_decrypt(struct ablkcipher_request *req)
872 {
873         return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB16);
874 }
875 
876 static int atmel_tdes_cfb32_encrypt(struct ablkcipher_request *req)
877 {
878         return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB |
879                                                 TDES_FLAGS_CFB32);
880 }
881 
882 static int atmel_tdes_cfb32_decrypt(struct ablkcipher_request *req)
883 {
884         return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB32);
885 }
886 
887 static int atmel_tdes_ofb_encrypt(struct ablkcipher_request *req)
888 {
889         return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_OFB);
890 }
891 
892 static int atmel_tdes_ofb_decrypt(struct ablkcipher_request *req)
893 {
894         return atmel_tdes_crypt(req, TDES_FLAGS_OFB);
895 }
896 
897 static int atmel_tdes_cra_init(struct crypto_tfm *tfm)
898 {
899         struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm);
900         struct atmel_tdes_dev *dd;
901 
902         tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_tdes_reqctx);
903 
904         dd = atmel_tdes_find_dev(ctx);
905         if (!dd)
906                 return -ENODEV;
907 
908         return 0;
909 }
910 
911 static void atmel_tdes_cra_exit(struct crypto_tfm *tfm)
912 {
913 }
914 
915 static struct crypto_alg tdes_algs[] = {
916 {
917         .cra_name               = "ecb(des)",
918         .cra_driver_name        = "atmel-ecb-des",
919         .cra_priority           = 100,
920         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
921         .cra_blocksize          = DES_BLOCK_SIZE,
922         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
923         .cra_alignmask          = 0x7,
924         .cra_type               = &crypto_ablkcipher_type,
925         .cra_module             = THIS_MODULE,
926         .cra_init               = atmel_tdes_cra_init,
927         .cra_exit               = atmel_tdes_cra_exit,
928         .cra_u.ablkcipher = {
929                 .min_keysize    = DES_KEY_SIZE,
930                 .max_keysize    = DES_KEY_SIZE,
931                 .setkey         = atmel_des_setkey,
932                 .encrypt        = atmel_tdes_ecb_encrypt,
933                 .decrypt        = atmel_tdes_ecb_decrypt,
934         }
935 },
936 {
937         .cra_name               = "cbc(des)",
938         .cra_driver_name        = "atmel-cbc-des",
939         .cra_priority           = 100,
940         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
941         .cra_blocksize          = DES_BLOCK_SIZE,
942         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
943         .cra_alignmask          = 0x7,
944         .cra_type               = &crypto_ablkcipher_type,
945         .cra_module             = THIS_MODULE,
946         .cra_init               = atmel_tdes_cra_init,
947         .cra_exit               = atmel_tdes_cra_exit,
948         .cra_u.ablkcipher = {
949                 .min_keysize    = DES_KEY_SIZE,
950                 .max_keysize    = DES_KEY_SIZE,
951                 .ivsize         = DES_BLOCK_SIZE,
952                 .setkey         = atmel_des_setkey,
953                 .encrypt        = atmel_tdes_cbc_encrypt,
954                 .decrypt        = atmel_tdes_cbc_decrypt,
955         }
956 },
957 {
958         .cra_name               = "cfb(des)",
959         .cra_driver_name        = "atmel-cfb-des",
960         .cra_priority           = 100,
961         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
962         .cra_blocksize          = DES_BLOCK_SIZE,
963         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
964         .cra_alignmask          = 0x7,
965         .cra_type               = &crypto_ablkcipher_type,
966         .cra_module             = THIS_MODULE,
967         .cra_init               = atmel_tdes_cra_init,
968         .cra_exit               = atmel_tdes_cra_exit,
969         .cra_u.ablkcipher = {
970                 .min_keysize    = DES_KEY_SIZE,
971                 .max_keysize    = DES_KEY_SIZE,
972                 .ivsize         = DES_BLOCK_SIZE,
973                 .setkey         = atmel_des_setkey,
974                 .encrypt        = atmel_tdes_cfb_encrypt,
975                 .decrypt        = atmel_tdes_cfb_decrypt,
976         }
977 },
978 {
979         .cra_name               = "cfb8(des)",
980         .cra_driver_name        = "atmel-cfb8-des",
981         .cra_priority           = 100,
982         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
983         .cra_blocksize          = CFB8_BLOCK_SIZE,
984         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
985         .cra_alignmask          = 0,
986         .cra_type               = &crypto_ablkcipher_type,
987         .cra_module             = THIS_MODULE,
988         .cra_init               = atmel_tdes_cra_init,
989         .cra_exit               = atmel_tdes_cra_exit,
990         .cra_u.ablkcipher = {
991                 .min_keysize    = DES_KEY_SIZE,
992                 .max_keysize    = DES_KEY_SIZE,
993                 .ivsize         = DES_BLOCK_SIZE,
994                 .setkey         = atmel_des_setkey,
995                 .encrypt        = atmel_tdes_cfb8_encrypt,
996                 .decrypt        = atmel_tdes_cfb8_decrypt,
997         }
998 },
999 {
1000         .cra_name               = "cfb16(des)",
1001         .cra_driver_name        = "atmel-cfb16-des",
1002         .cra_priority           = 100,
1003         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1004         .cra_blocksize          = CFB16_BLOCK_SIZE,
1005         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
1006         .cra_alignmask          = 0x1,
1007         .cra_type               = &crypto_ablkcipher_type,
1008         .cra_module             = THIS_MODULE,
1009         .cra_init               = atmel_tdes_cra_init,
1010         .cra_exit               = atmel_tdes_cra_exit,
1011         .cra_u.ablkcipher = {
1012                 .min_keysize    = DES_KEY_SIZE,
1013                 .max_keysize    = DES_KEY_SIZE,
1014                 .ivsize         = DES_BLOCK_SIZE,
1015                 .setkey         = atmel_des_setkey,
1016                 .encrypt        = atmel_tdes_cfb16_encrypt,
1017                 .decrypt        = atmel_tdes_cfb16_decrypt,
1018         }
1019 },
1020 {
1021         .cra_name               = "cfb32(des)",
1022         .cra_driver_name        = "atmel-cfb32-des",
1023         .cra_priority           = 100,
1024         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1025         .cra_blocksize          = CFB32_BLOCK_SIZE,
1026         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
1027         .cra_alignmask          = 0x3,
1028         .cra_type               = &crypto_ablkcipher_type,
1029         .cra_module             = THIS_MODULE,
1030         .cra_init               = atmel_tdes_cra_init,
1031         .cra_exit               = atmel_tdes_cra_exit,
1032         .cra_u.ablkcipher = {
1033                 .min_keysize    = DES_KEY_SIZE,
1034                 .max_keysize    = DES_KEY_SIZE,
1035                 .ivsize         = DES_BLOCK_SIZE,
1036                 .setkey         = atmel_des_setkey,
1037                 .encrypt        = atmel_tdes_cfb32_encrypt,
1038                 .decrypt        = atmel_tdes_cfb32_decrypt,
1039         }
1040 },
1041 {
1042         .cra_name               = "ofb(des)",
1043         .cra_driver_name        = "atmel-ofb-des",
1044         .cra_priority           = 100,
1045         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1046         .cra_blocksize          = DES_BLOCK_SIZE,
1047         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
1048         .cra_alignmask          = 0x7,
1049         .cra_type               = &crypto_ablkcipher_type,
1050         .cra_module             = THIS_MODULE,
1051         .cra_init               = atmel_tdes_cra_init,
1052         .cra_exit               = atmel_tdes_cra_exit,
1053         .cra_u.ablkcipher = {
1054                 .min_keysize    = DES_KEY_SIZE,
1055                 .max_keysize    = DES_KEY_SIZE,
1056                 .ivsize         = DES_BLOCK_SIZE,
1057                 .setkey         = atmel_des_setkey,
1058                 .encrypt        = atmel_tdes_ofb_encrypt,
1059                 .decrypt        = atmel_tdes_ofb_decrypt,
1060         }
1061 },
1062 {
1063         .cra_name               = "ecb(des3_ede)",
1064         .cra_driver_name        = "atmel-ecb-tdes",
1065         .cra_priority           = 100,
1066         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1067         .cra_blocksize          = DES_BLOCK_SIZE,
1068         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
1069         .cra_alignmask          = 0x7,
1070         .cra_type               = &crypto_ablkcipher_type,
1071         .cra_module             = THIS_MODULE,
1072         .cra_init               = atmel_tdes_cra_init,
1073         .cra_exit               = atmel_tdes_cra_exit,
1074         .cra_u.ablkcipher = {
1075                 .min_keysize    = 2 * DES_KEY_SIZE,
1076                 .max_keysize    = 3 * DES_KEY_SIZE,
1077                 .setkey         = atmel_tdes_setkey,
1078                 .encrypt        = atmel_tdes_ecb_encrypt,
1079                 .decrypt        = atmel_tdes_ecb_decrypt,
1080         }
1081 },
1082 {
1083         .cra_name               = "cbc(des3_ede)",
1084         .cra_driver_name        = "atmel-cbc-tdes",
1085         .cra_priority           = 100,
1086         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1087         .cra_blocksize          = DES_BLOCK_SIZE,
1088         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
1089         .cra_alignmask          = 0x7,
1090         .cra_type               = &crypto_ablkcipher_type,
1091         .cra_module             = THIS_MODULE,
1092         .cra_init               = atmel_tdes_cra_init,
1093         .cra_exit               = atmel_tdes_cra_exit,
1094         .cra_u.ablkcipher = {
1095                 .min_keysize    = 2*DES_KEY_SIZE,
1096                 .max_keysize    = 3*DES_KEY_SIZE,
1097                 .ivsize         = DES_BLOCK_SIZE,
1098                 .setkey         = atmel_tdes_setkey,
1099                 .encrypt        = atmel_tdes_cbc_encrypt,
1100                 .decrypt        = atmel_tdes_cbc_decrypt,
1101         }
1102 },
1103 {
1104         .cra_name               = "cfb(des3_ede)",
1105         .cra_driver_name        = "atmel-cfb-tdes",
1106         .cra_priority           = 100,
1107         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1108         .cra_blocksize          = DES_BLOCK_SIZE,
1109         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
1110         .cra_alignmask          = 0x7,
1111         .cra_type               = &crypto_ablkcipher_type,
1112         .cra_module             = THIS_MODULE,
1113         .cra_init               = atmel_tdes_cra_init,
1114         .cra_exit               = atmel_tdes_cra_exit,
1115         .cra_u.ablkcipher = {
1116                 .min_keysize    = 2*DES_KEY_SIZE,
1117                 .max_keysize    = 2*DES_KEY_SIZE,
1118                 .ivsize         = DES_BLOCK_SIZE,
1119                 .setkey         = atmel_tdes_setkey,
1120                 .encrypt        = atmel_tdes_cfb_encrypt,
1121                 .decrypt        = atmel_tdes_cfb_decrypt,
1122         }
1123 },
1124 {
1125         .cra_name               = "cfb8(des3_ede)",
1126         .cra_driver_name        = "atmel-cfb8-tdes",
1127         .cra_priority           = 100,
1128         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1129         .cra_blocksize          = CFB8_BLOCK_SIZE,
1130         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
1131         .cra_alignmask          = 0,
1132         .cra_type               = &crypto_ablkcipher_type,
1133         .cra_module             = THIS_MODULE,
1134         .cra_init               = atmel_tdes_cra_init,
1135         .cra_exit               = atmel_tdes_cra_exit,
1136         .cra_u.ablkcipher = {
1137                 .min_keysize    = 2*DES_KEY_SIZE,
1138                 .max_keysize    = 2*DES_KEY_SIZE,
1139                 .ivsize         = DES_BLOCK_SIZE,
1140                 .setkey         = atmel_tdes_setkey,
1141                 .encrypt        = atmel_tdes_cfb8_encrypt,
1142                 .decrypt        = atmel_tdes_cfb8_decrypt,
1143         }
1144 },
1145 {
1146         .cra_name               = "cfb16(des3_ede)",
1147         .cra_driver_name        = "atmel-cfb16-tdes",
1148         .cra_priority           = 100,
1149         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1150         .cra_blocksize          = CFB16_BLOCK_SIZE,
1151         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
1152         .cra_alignmask          = 0x1,
1153         .cra_type               = &crypto_ablkcipher_type,
1154         .cra_module             = THIS_MODULE,
1155         .cra_init               = atmel_tdes_cra_init,
1156         .cra_exit               = atmel_tdes_cra_exit,
1157         .cra_u.ablkcipher = {
1158                 .min_keysize    = 2*DES_KEY_SIZE,
1159                 .max_keysize    = 2*DES_KEY_SIZE,
1160                 .ivsize         = DES_BLOCK_SIZE,
1161                 .setkey         = atmel_tdes_setkey,
1162                 .encrypt        = atmel_tdes_cfb16_encrypt,
1163                 .decrypt        = atmel_tdes_cfb16_decrypt,
1164         }
1165 },
1166 {
1167         .cra_name               = "cfb32(des3_ede)",
1168         .cra_driver_name        = "atmel-cfb32-tdes",
1169         .cra_priority           = 100,
1170         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1171         .cra_blocksize          = CFB32_BLOCK_SIZE,
1172         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
1173         .cra_alignmask          = 0x3,
1174         .cra_type               = &crypto_ablkcipher_type,
1175         .cra_module             = THIS_MODULE,
1176         .cra_init               = atmel_tdes_cra_init,
1177         .cra_exit               = atmel_tdes_cra_exit,
1178         .cra_u.ablkcipher = {
1179                 .min_keysize    = 2*DES_KEY_SIZE,
1180                 .max_keysize    = 2*DES_KEY_SIZE,
1181                 .ivsize         = DES_BLOCK_SIZE,
1182                 .setkey         = atmel_tdes_setkey,
1183                 .encrypt        = atmel_tdes_cfb32_encrypt,
1184                 .decrypt        = atmel_tdes_cfb32_decrypt,
1185         }
1186 },
1187 {
1188         .cra_name               = "ofb(des3_ede)",
1189         .cra_driver_name        = "atmel-ofb-tdes",
1190         .cra_priority           = 100,
1191         .cra_flags              = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
1192         .cra_blocksize          = DES_BLOCK_SIZE,
1193         .cra_ctxsize            = sizeof(struct atmel_tdes_ctx),
1194         .cra_alignmask          = 0x7,
1195         .cra_type               = &crypto_ablkcipher_type,
1196         .cra_module             = THIS_MODULE,
1197         .cra_init               = atmel_tdes_cra_init,
1198         .cra_exit               = atmel_tdes_cra_exit,
1199         .cra_u.ablkcipher = {
1200                 .min_keysize    = 2*DES_KEY_SIZE,
1201                 .max_keysize    = 3*DES_KEY_SIZE,
1202                 .ivsize         = DES_BLOCK_SIZE,
1203                 .setkey         = atmel_tdes_setkey,
1204                 .encrypt        = atmel_tdes_ofb_encrypt,
1205                 .decrypt        = atmel_tdes_ofb_decrypt,
1206         }
1207 },
1208 };
1209 
1210 static void atmel_tdes_queue_task(unsigned long data)
1211 {
1212         struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *)data;
1213 
1214         atmel_tdes_handle_queue(dd, NULL);
1215 }
1216 
1217 static void atmel_tdes_done_task(unsigned long data)
1218 {
1219         struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *) data;
1220         int err;
1221 
1222         if (!(dd->flags & TDES_FLAGS_DMA))
1223                 err = atmel_tdes_crypt_pdc_stop(dd);
1224         else
1225                 err = atmel_tdes_crypt_dma_stop(dd);
1226 
1227         err = dd->err ? : err;
1228 
1229         if (dd->total && !err) {
1230                 if (dd->flags & TDES_FLAGS_FAST) {
1231                         dd->in_sg = sg_next(dd->in_sg);
1232                         dd->out_sg = sg_next(dd->out_sg);
1233                         if (!dd->in_sg || !dd->out_sg)
1234                                 err = -EINVAL;
1235                 }
1236                 if (!err)
1237                         err = atmel_tdes_crypt_start(dd);
1238                 if (!err)
1239                         return; /* DMA started. Not fininishing. */
1240         }
1241 
1242         atmel_tdes_finish_req(dd, err);
1243         atmel_tdes_handle_queue(dd, NULL);
1244 }
1245 
1246 static irqreturn_t atmel_tdes_irq(int irq, void *dev_id)
1247 {
1248         struct atmel_tdes_dev *tdes_dd = dev_id;
1249         u32 reg;
1250 
1251         reg = atmel_tdes_read(tdes_dd, TDES_ISR);
1252         if (reg & atmel_tdes_read(tdes_dd, TDES_IMR)) {
1253                 atmel_tdes_write(tdes_dd, TDES_IDR, reg);
1254                 if (TDES_FLAGS_BUSY & tdes_dd->flags)
1255                         tasklet_schedule(&tdes_dd->done_task);
1256                 else
1257                         dev_warn(tdes_dd->dev, "TDES interrupt when no active requests.\n");
1258                 return IRQ_HANDLED;
1259         }
1260 
1261         return IRQ_NONE;
1262 }
1263 
1264 static void atmel_tdes_unregister_algs(struct atmel_tdes_dev *dd)
1265 {
1266         int i;
1267 
1268         for (i = 0; i < ARRAY_SIZE(tdes_algs); i++)
1269                 crypto_unregister_alg(&tdes_algs[i]);
1270 }
1271 
1272 static int atmel_tdes_register_algs(struct atmel_tdes_dev *dd)
1273 {
1274         int err, i, j;
1275 
1276         for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) {
1277                 err = crypto_register_alg(&tdes_algs[i]);
1278                 if (err)
1279                         goto err_tdes_algs;
1280         }
1281 
1282         return 0;
1283 
1284 err_tdes_algs:
1285         for (j = 0; j < i; j++)
1286                 crypto_unregister_alg(&tdes_algs[j]);
1287 
1288         return err;
1289 }
1290 
1291 static void atmel_tdes_get_cap(struct atmel_tdes_dev *dd)
1292 {
1293 
1294         dd->caps.has_dma = 0;
1295         dd->caps.has_cfb_3keys = 0;
1296 
1297         /* keep only major version number */
1298         switch (dd->hw_version & 0xf00) {
1299         case 0x700:
1300                 dd->caps.has_dma = 1;
1301                 dd->caps.has_cfb_3keys = 1;
1302                 break;
1303         case 0x600:
1304                 break;
1305         default:
1306                 dev_warn(dd->dev,
1307                                 "Unmanaged tdes version, set minimum capabilities\n");
1308                 break;
1309         }
1310 }
1311 
1312 #if defined(CONFIG_OF)
1313 static const struct of_device_id atmel_tdes_dt_ids[] = {
1314         { .compatible = "atmel,at91sam9g46-tdes" },
1315         { /* sentinel */ }
1316 };
1317 MODULE_DEVICE_TABLE(of, atmel_tdes_dt_ids);
1318 
1319 static struct crypto_platform_data *atmel_tdes_of_init(struct platform_device *pdev)
1320 {
1321         struct device_node *np = pdev->dev.of_node;
1322         struct crypto_platform_data *pdata;
1323 
1324         if (!np) {
1325                 dev_err(&pdev->dev, "device node not found\n");
1326                 return ERR_PTR(-EINVAL);
1327         }
1328 
1329         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
1330         if (!pdata) {
1331                 dev_err(&pdev->dev, "could not allocate memory for pdata\n");
1332                 return ERR_PTR(-ENOMEM);
1333         }
1334 
1335         pdata->dma_slave = devm_kzalloc(&pdev->dev,
1336                                         sizeof(*(pdata->dma_slave)),
1337                                         GFP_KERNEL);
1338         if (!pdata->dma_slave) {
1339                 dev_err(&pdev->dev, "could not allocate memory for dma_slave\n");
1340                 devm_kfree(&pdev->dev, pdata);
1341                 return ERR_PTR(-ENOMEM);
1342         }
1343 
1344         return pdata;
1345 }
1346 #else /* CONFIG_OF */
1347 static inline struct crypto_platform_data *atmel_tdes_of_init(struct platform_device *pdev)
1348 {
1349         return ERR_PTR(-EINVAL);
1350 }
1351 #endif
1352 
1353 static int atmel_tdes_probe(struct platform_device *pdev)
1354 {
1355         struct atmel_tdes_dev *tdes_dd;
1356         struct crypto_platform_data     *pdata;
1357         struct device *dev = &pdev->dev;
1358         struct resource *tdes_res;
1359         unsigned long tdes_phys_size;
1360         int err;
1361 
1362         tdes_dd = kzalloc(sizeof(struct atmel_tdes_dev), GFP_KERNEL);
1363         if (tdes_dd == NULL) {
1364                 dev_err(dev, "unable to alloc data struct.\n");
1365                 err = -ENOMEM;
1366                 goto tdes_dd_err;
1367         }
1368 
1369         tdes_dd->dev = dev;
1370 
1371         platform_set_drvdata(pdev, tdes_dd);
1372 
1373         INIT_LIST_HEAD(&tdes_dd->list);
1374 
1375         tasklet_init(&tdes_dd->done_task, atmel_tdes_done_task,
1376                                         (unsigned long)tdes_dd);
1377         tasklet_init(&tdes_dd->queue_task, atmel_tdes_queue_task,
1378                                         (unsigned long)tdes_dd);
1379 
1380         crypto_init_queue(&tdes_dd->queue, ATMEL_TDES_QUEUE_LENGTH);
1381 
1382         tdes_dd->irq = -1;
1383 
1384         /* Get the base address */
1385         tdes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1386         if (!tdes_res) {
1387                 dev_err(dev, "no MEM resource info\n");
1388                 err = -ENODEV;
1389                 goto res_err;
1390         }
1391         tdes_dd->phys_base = tdes_res->start;
1392         tdes_phys_size = resource_size(tdes_res);
1393 
1394         /* Get the IRQ */
1395         tdes_dd->irq = platform_get_irq(pdev,  0);
1396         if (tdes_dd->irq < 0) {
1397                 dev_err(dev, "no IRQ resource info\n");
1398                 err = tdes_dd->irq;
1399                 goto res_err;
1400         }
1401 
1402         err = request_irq(tdes_dd->irq, atmel_tdes_irq, IRQF_SHARED,
1403                         "atmel-tdes", tdes_dd);
1404         if (err) {
1405                 dev_err(dev, "unable to request tdes irq.\n");
1406                 goto tdes_irq_err;
1407         }
1408 
1409         /* Initializing the clock */
1410         tdes_dd->iclk = clk_get(&pdev->dev, "tdes_clk");
1411         if (IS_ERR(tdes_dd->iclk)) {
1412                 dev_err(dev, "clock intialization failed.\n");
1413                 err = PTR_ERR(tdes_dd->iclk);
1414                 goto clk_err;
1415         }
1416 
1417         tdes_dd->io_base = ioremap(tdes_dd->phys_base, tdes_phys_size);
1418         if (!tdes_dd->io_base) {
1419                 dev_err(dev, "can't ioremap\n");
1420                 err = -ENOMEM;
1421                 goto tdes_io_err;
1422         }
1423 
1424         atmel_tdes_hw_version_init(tdes_dd);
1425 
1426         atmel_tdes_get_cap(tdes_dd);
1427 
1428         err = atmel_tdes_buff_init(tdes_dd);
1429         if (err)
1430                 goto err_tdes_buff;
1431 
1432         if (tdes_dd->caps.has_dma) {
1433                 pdata = pdev->dev.platform_data;
1434                 if (!pdata) {
1435                         pdata = atmel_tdes_of_init(pdev);
1436                         if (IS_ERR(pdata)) {
1437                                 dev_err(&pdev->dev, "platform data not available\n");
1438                                 err = PTR_ERR(pdata);
1439                                 goto err_pdata;
1440                         }
1441                 }
1442                 if (!pdata->dma_slave) {
1443                         err = -ENXIO;
1444                         goto err_pdata;
1445                 }
1446                 err = atmel_tdes_dma_init(tdes_dd, pdata);
1447                 if (err)
1448                         goto err_tdes_dma;
1449 
1450                 dev_info(dev, "using %s, %s for DMA transfers\n",
1451                                 dma_chan_name(tdes_dd->dma_lch_in.chan),
1452                                 dma_chan_name(tdes_dd->dma_lch_out.chan));
1453         }
1454 
1455         spin_lock(&atmel_tdes.lock);
1456         list_add_tail(&tdes_dd->list, &atmel_tdes.dev_list);
1457         spin_unlock(&atmel_tdes.lock);
1458 
1459         err = atmel_tdes_register_algs(tdes_dd);
1460         if (err)
1461                 goto err_algs;
1462 
1463         dev_info(dev, "Atmel DES/TDES\n");
1464 
1465         return 0;
1466 
1467 err_algs:
1468         spin_lock(&atmel_tdes.lock);
1469         list_del(&tdes_dd->list);
1470         spin_unlock(&atmel_tdes.lock);
1471         if (tdes_dd->caps.has_dma)
1472                 atmel_tdes_dma_cleanup(tdes_dd);
1473 err_tdes_dma:
1474 err_pdata:
1475         atmel_tdes_buff_cleanup(tdes_dd);
1476 err_tdes_buff:
1477         iounmap(tdes_dd->io_base);
1478 tdes_io_err:
1479         clk_put(tdes_dd->iclk);
1480 clk_err:
1481         free_irq(tdes_dd->irq, tdes_dd);
1482 tdes_irq_err:
1483 res_err:
1484         tasklet_kill(&tdes_dd->done_task);
1485         tasklet_kill(&tdes_dd->queue_task);
1486         kfree(tdes_dd);
1487         tdes_dd = NULL;
1488 tdes_dd_err:
1489         dev_err(dev, "initialization failed.\n");
1490 
1491         return err;
1492 }
1493 
1494 static int atmel_tdes_remove(struct platform_device *pdev)
1495 {
1496         static struct atmel_tdes_dev *tdes_dd;
1497 
1498         tdes_dd = platform_get_drvdata(pdev);
1499         if (!tdes_dd)
1500                 return -ENODEV;
1501         spin_lock(&atmel_tdes.lock);
1502         list_del(&tdes_dd->list);
1503         spin_unlock(&atmel_tdes.lock);
1504 
1505         atmel_tdes_unregister_algs(tdes_dd);
1506 
1507         tasklet_kill(&tdes_dd->done_task);
1508         tasklet_kill(&tdes_dd->queue_task);
1509 
1510         if (tdes_dd->caps.has_dma)
1511                 atmel_tdes_dma_cleanup(tdes_dd);
1512 
1513         atmel_tdes_buff_cleanup(tdes_dd);
1514 
1515         iounmap(tdes_dd->io_base);
1516 
1517         clk_put(tdes_dd->iclk);
1518 
1519         if (tdes_dd->irq >= 0)
1520                 free_irq(tdes_dd->irq, tdes_dd);
1521 
1522         kfree(tdes_dd);
1523         tdes_dd = NULL;
1524 
1525         return 0;
1526 }
1527 
1528 static struct platform_driver atmel_tdes_driver = {
1529         .probe          = atmel_tdes_probe,
1530         .remove         = atmel_tdes_remove,
1531         .driver         = {
1532                 .name   = "atmel_tdes",
1533                 .owner  = THIS_MODULE,
1534                 .of_match_table = of_match_ptr(atmel_tdes_dt_ids),
1535         },
1536 };
1537 
1538 module_platform_driver(atmel_tdes_driver);
1539 
1540 MODULE_DESCRIPTION("Atmel DES/TDES hw acceleration support.");
1541 MODULE_LICENSE("GPL v2");
1542 MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
1543 

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