Version:  2.0.40 2.2.26 2.4.37 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5

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

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