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crypto: atmel-tdes - Drop if with an always false condition
[people/ms/linux.git] / drivers / crypto / atmel-tdes.c
CommitLineData
820684cc 1// SPDX-License-Identifier: GPL-2.0
13802005
NR		 2/*
3 * Cryptographic API.
4 *
5 * Support for ATMEL DES/TDES HW acceleration.
6 *
7 * Copyright (c) 2012 Eukréa Electromatique - ATMEL
8 * Author: Nicolas Royer <nicolas@eukrea.com>
9 *
13802005
NR		 10 * Some ideas are from omap-aes.c drivers.
11 */
12
13
14#include <linux/kernel.h>
15#include <linux/module.h>
16#include <linux/slab.h>
17#include <linux/err.h>
18#include <linux/clk.h>
19#include <linux/io.h>
20#include <linux/hw_random.h>
21#include <linux/platform_device.h>
22
23#include <linux/device.h>
b46f36c0 24#include <linux/dmaengine.h>
13802005
NR		 25#include <linux/init.h>
26#include <linux/errno.h>
27#include <linux/interrupt.h>
13802005 28#include <linux/irq.h>
13802005
NR		 29#include <linux/scatterlist.h>
30#include <linux/dma-mapping.h>
84c8976b 31#include <linux/of_device.h>
13802005
NR		 32#include <linux/delay.h>
33#include <linux/crypto.h>
13802005
NR		 34#include <crypto/scatterwalk.h>
35#include <crypto/algapi.h>
92c203e2 36#include <crypto/internal/des.h>
967d4910 37#include <crypto/internal/skcipher.h>
13802005
NR		 38#include "atmel-tdes-regs.h"
39
7c783029
TA		 40#define ATMEL_TDES_PRIORITY 300
41
13802005 42/* TDES flags */
848572f8
TA		 43/* Reserve bits [17:16], [13:12], [2:0] for AES Mode Register */
44#define TDES_FLAGS_ENCRYPT TDES_MR_CYPHER_ENC
45#define TDES_FLAGS_OPMODE_MASK (TDES_MR_OPMOD_MASK | TDES_MR_CFBS_MASK)
46#define TDES_FLAGS_ECB TDES_MR_OPMOD_ECB
47#define TDES_FLAGS_CBC TDES_MR_OPMOD_CBC
48#define TDES_FLAGS_OFB TDES_MR_OPMOD_OFB
49#define TDES_FLAGS_CFB64 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_64b)
50#define TDES_FLAGS_CFB32 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_32b)
51#define TDES_FLAGS_CFB16 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_16b)
52#define TDES_FLAGS_CFB8 (TDES_MR_OPMOD_CFB | TDES_MR_CFBS_8b)
53
54#define TDES_FLAGS_MODE_MASK (TDES_FLAGS_OPMODE_MASK | TDES_FLAGS_ENCRYPT)
55
56#define TDES_FLAGS_INIT BIT(3)
57#define TDES_FLAGS_FAST BIT(4)
58#define TDES_FLAGS_BUSY BIT(5)
59#define TDES_FLAGS_DMA BIT(6)
13802005 60
1f858040 61#define ATMEL_TDES_QUEUE_LENGTH 50
13802005
NR		 62
63#define CFB8_BLOCK_SIZE 1
64#define CFB16_BLOCK_SIZE 2
65#define CFB32_BLOCK_SIZE 4
13802005 66
1f858040
NR		 67struct atmel_tdes_caps {
68 bool has_dma;
69 u32 has_cfb_3keys;
70};
13802005
NR		 71
72struct atmel_tdes_dev;
73
74struct atmel_tdes_ctx {
75 struct atmel_tdes_dev *dd;
76
77 int keylen;
967d4910 78 u32 key[DES3_EDE_KEY_SIZE / sizeof(u32)];
13802005 79 unsigned long flags;
1f858040
NR		 80
81 u16 block_size;
13802005
NR		 82};
83
84struct atmel_tdes_reqctx {
85 unsigned long mode;
61b0dd66 86 u8 lastc[DES_BLOCK_SIZE];
13802005
NR		 87};
88
1f858040
NR		 89struct atmel_tdes_dma {
90 struct dma_chan *chan;
91 struct dma_slave_config dma_conf;
92};
93
13802005
NR		 94struct atmel_tdes_dev {
95 struct list_head list;
96 unsigned long phys_base;
97 void __iomem *io_base;
98
99 struct atmel_tdes_ctx *ctx;
100 struct device *dev;
101 struct clk *iclk;
102 int irq;
103
104 unsigned long flags;
13802005
NR		 105
106 spinlock_t lock;
107 struct crypto_queue queue;
108
109 struct tasklet_struct done_task;
110 struct tasklet_struct queue_task;
111
967d4910 112 struct skcipher_request *req;
13802005
NR		 113 size_t total;
114
115 struct scatterlist *in_sg;
1f858040 116 unsigned int nb_in_sg;
13802005
NR		 117 size_t in_offset;
118 struct scatterlist *out_sg;
1f858040 119 unsigned int nb_out_sg;
13802005
NR		 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;
1f858040 128 struct atmel_tdes_dma dma_lch_in;
13802005
NR		 129
130 void *buf_out;
131 int dma_out;
132 dma_addr_t dma_addr_out;
1f858040
NR		 133 struct atmel_tdes_dma dma_lch_out;
134
135 struct atmel_tdes_caps caps;
136
137 u32 hw_version;
13802005
NR		 138};
139
140struct atmel_tdes_drv {
141 struct list_head dev_list;
142 spinlock_t lock;
143};
144
145static 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
150static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset,
151 void *buf, size_t buflen, size_t total, int out)
152{
4c147bcf 153 size_t count, off = 0;
13802005
NR		 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
181static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset)
182{
183 return readl_relaxed(dd->io_base + offset);
184}
185
186static 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
192static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset,
7b49fabf 193 const u32 *value, int count)
13802005
NR		 194{
195 for (; count--; value++, offset += 4)
196 atmel_tdes_write(dd, offset, *value);
197}
198
632a761a 199static struct atmel_tdes_dev *atmel_tdes_dev_alloc(void)
13802005 200{
632a761a 201 struct atmel_tdes_dev *tdes_dd;
13802005
NR		 202
203 spin_lock_bh(&atmel_tdes.lock);
632a761a
TA		 204 /* One TDES IP per SoC. */
205 tdes_dd = list_first_entry_or_null(&atmel_tdes.dev_list,
206 struct atmel_tdes_dev, list);
13802005 207 spin_unlock_bh(&atmel_tdes.lock);
13802005
NR		 208 return tdes_dd;
209}
210
211static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd)
212{
9d83d299
LC		 213 int err;
214
215 err = clk_prepare_enable(dd->iclk);
216 if (err)
217 return err;
13802005
NR		 218
219 if (!(dd->flags & TDES_FLAGS_INIT)) {
220 atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST);
221 dd->flags |= TDES_FLAGS_INIT;
13802005
NR		 222 }
223
224 return 0;
225}
226
1f858040
NR		 227static inline unsigned int atmel_tdes_get_version(struct atmel_tdes_dev *dd)
228{
229 return atmel_tdes_read(dd, TDES_HW_VERSION) & 0x00000fff;
230}
231
0efe58f3 232static int atmel_tdes_hw_version_init(struct atmel_tdes_dev *dd)
1f858040 233{
0efe58f3
TA		 234 int err;
235
236 err = atmel_tdes_hw_init(dd);
237 if (err)
238 return err;
1f858040
NR		 239
240 dd->hw_version = atmel_tdes_get_version(dd);
241
242 dev_info(dd->dev,
243 "version: 0x%x\n", dd->hw_version);
244
245 clk_disable_unprepare(dd->iclk);
0efe58f3
TA		 246
247 return 0;
1f858040
NR		 248}
249
250static void atmel_tdes_dma_callback(void *data)
251{
252 struct atmel_tdes_dev *dd = data;
253
254 /* dma_lch_out - completed */
255 tasklet_schedule(&dd->done_task);
256}
257
13802005
NR		 258static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd)
259{
260 int err;
7d0979e2 261 u32 valmr = TDES_MR_SMOD_PDC;
13802005
NR		 262
263 err = atmel_tdes_hw_init(dd);
264
265 if (err)
266 return err;
267
1f858040
NR		 268 if (!dd->caps.has_dma)
269 atmel_tdes_write(dd, TDES_PTCR,
270 TDES_PTCR_TXTDIS | TDES_PTCR_RXTDIS);
13802005
NR		 271
272 /* MR register must be set before IV registers */
273 if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) {
274 valmr |= TDES_MR_KEYMOD_3KEY;
275 valmr |= TDES_MR_TDESMOD_TDES;
276 } else if (dd->ctx->keylen > DES_KEY_SIZE) {
277 valmr |= TDES_MR_KEYMOD_2KEY;
278 valmr |= TDES_MR_TDESMOD_TDES;
279 } else {
280 valmr |= TDES_MR_TDESMOD_DES;
281 }
282
848572f8 283 valmr |= dd->flags & TDES_FLAGS_MODE_MASK;
13802005 284
13802005
NR		 285 atmel_tdes_write(dd, TDES_MR, valmr);
286
287 atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key,
288 dd->ctx->keylen >> 2);
289
848572f8 290 if (dd->req->iv && (valmr & TDES_MR_OPMOD_MASK) != TDES_MR_OPMOD_ECB)
967d4910 291 atmel_tdes_write_n(dd, TDES_IV1R, (void *)dd->req->iv, 2);
13802005
NR		 292
293 return 0;
294}
295
1f858040 296static int atmel_tdes_crypt_pdc_stop(struct atmel_tdes_dev *dd)
13802005
NR		 297{
298 int err = 0;
299 size_t count;
300
301 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
302
303 if (dd->flags & TDES_FLAGS_FAST) {
304 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
305 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
306 } else {
307 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
308 dd->dma_size, DMA_FROM_DEVICE);
309
310 /* copy data */
311 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
312 dd->buf_out, dd->buflen, dd->dma_size, 1);
313 if (count != dd->dma_size) {
314 err = -EINVAL;
817b804c 315 dev_dbg(dd->dev, "not all data converted: %zu\n", count);
13802005
NR		 316 }
317 }
318
319 return err;
320}
321
1f858040 322static int atmel_tdes_buff_init(struct atmel_tdes_dev *dd)
13802005
NR		 323{
324 int err = -ENOMEM;
325
326 dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0);
327 dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0);
328 dd->buflen = PAGE_SIZE;
329 dd->buflen &= ~(DES_BLOCK_SIZE - 1);
330
331 if (!dd->buf_in || !dd->buf_out) {
817b804c 332 dev_dbg(dd->dev, "unable to alloc pages.\n");
13802005
NR		 333 goto err_alloc;
334 }
335
336 /* MAP here */
337 dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in,
338 dd->buflen, DMA_TO_DEVICE);
817b804c
TA		 339 err = dma_mapping_error(dd->dev, dd->dma_addr_in);
340 if (err) {
341 dev_dbg(dd->dev, "dma %zd bytes error\n", dd->buflen);
13802005
NR		 342 goto err_map_in;
343 }
344
345 dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out,
346 dd->buflen, DMA_FROM_DEVICE);
817b804c
TA		 347 err = dma_mapping_error(dd->dev, dd->dma_addr_out);
348 if (err) {
349 dev_dbg(dd->dev, "dma %zd bytes error\n", dd->buflen);
13802005
NR		 350 goto err_map_out;
351 }
352
353 return 0;
354
355err_map_out:
356 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
357 DMA_TO_DEVICE);
358err_map_in:
088f628c 359err_alloc:
13802005
NR		 360 free_page((unsigned long)dd->buf_out);
361 free_page((unsigned long)dd->buf_in);
13802005
NR		 362 return err;
363}
364
1f858040 365static void atmel_tdes_buff_cleanup(struct atmel_tdes_dev *dd)
13802005
NR		 366{
367 dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen,
368 DMA_FROM_DEVICE);
369 dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen,
370 DMA_TO_DEVICE);
371 free_page((unsigned long)dd->buf_out);
372 free_page((unsigned long)dd->buf_in);
373}
374
75eca7a7
TA		 375static int atmel_tdes_crypt_pdc(struct atmel_tdes_dev *dd,
376 dma_addr_t dma_addr_in,
377 dma_addr_t dma_addr_out, int length)
13802005 378{
848572f8 379 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req);
13802005
NR		 380 int len32;
381
382 dd->dma_size = length;
383
384 if (!(dd->flags & TDES_FLAGS_FAST)) {
385 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
386 DMA_TO_DEVICE);
387 }
388
848572f8
TA		 389 switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) {
390 case TDES_FLAGS_CFB8:
13802005 391 len32 = DIV_ROUND_UP(length, sizeof(u8));
848572f8
TA		 392 break;
393
394 case TDES_FLAGS_CFB16:
13802005 395 len32 = DIV_ROUND_UP(length, sizeof(u16));
848572f8
TA		 396 break;
397
398 default:
13802005 399 len32 = DIV_ROUND_UP(length, sizeof(u32));
848572f8
TA		 400 break;
401 }
13802005
NR		 402
403 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS);
404 atmel_tdes_write(dd, TDES_TPR, dma_addr_in);
405 atmel_tdes_write(dd, TDES_TCR, len32);
406 atmel_tdes_write(dd, TDES_RPR, dma_addr_out);
407 atmel_tdes_write(dd, TDES_RCR, len32);
408
409 /* Enable Interrupt */
410 atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX);
411
412 /* Start DMA transfer */
413 atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN);
414
415 return 0;
416}
417
75eca7a7
TA		 418static int atmel_tdes_crypt_dma(struct atmel_tdes_dev *dd,
419 dma_addr_t dma_addr_in,
420 dma_addr_t dma_addr_out, int length)
1f858040 421{
848572f8 422 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(dd->req);
1f858040
NR		 423 struct scatterlist sg[2];
424 struct dma_async_tx_descriptor *in_desc, *out_desc;
848572f8 425 enum dma_slave_buswidth addr_width;
1f858040
NR		 426
427 dd->dma_size = length;
428
429 if (!(dd->flags & TDES_FLAGS_FAST)) {
430 dma_sync_single_for_device(dd->dev, dma_addr_in, length,
431 DMA_TO_DEVICE);
432 }
433
848572f8
TA		 434 switch (rctx->mode & TDES_FLAGS_OPMODE_MASK) {
435 case TDES_FLAGS_CFB8:
436 addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE;
437 break;
438
439 case TDES_FLAGS_CFB16:
440 addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
441 break;
442
443 default:
444 addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
445 break;
1f858040
NR		 446 }
447
848572f8
TA		 448 dd->dma_lch_in.dma_conf.dst_addr_width = addr_width;
449 dd->dma_lch_out.dma_conf.src_addr_width = addr_width;
450
1f858040
NR		 451 dmaengine_slave_config(dd->dma_lch_in.chan, &dd->dma_lch_in.dma_conf);
452 dmaengine_slave_config(dd->dma_lch_out.chan, &dd->dma_lch_out.dma_conf);
453
454 dd->flags |= TDES_FLAGS_DMA;
455
456 sg_init_table(&sg[0], 1);
457 sg_dma_address(&sg[0]) = dma_addr_in;
458 sg_dma_len(&sg[0]) = length;
459
460 sg_init_table(&sg[1], 1);
461 sg_dma_address(&sg[1]) = dma_addr_out;
462 sg_dma_len(&sg[1]) = length;
463
464 in_desc = dmaengine_prep_slave_sg(dd->dma_lch_in.chan, &sg[0],
465 1, DMA_MEM_TO_DEV,
466 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
467 if (!in_desc)
468 return -EINVAL;
469
470 out_desc = dmaengine_prep_slave_sg(dd->dma_lch_out.chan, &sg[1],
471 1, DMA_DEV_TO_MEM,
472 DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
473 if (!out_desc)
474 return -EINVAL;
475
476 out_desc->callback = atmel_tdes_dma_callback;
477 out_desc->callback_param = dd;
478
479 dmaengine_submit(out_desc);
480 dma_async_issue_pending(dd->dma_lch_out.chan);
481
482 dmaengine_submit(in_desc);
483 dma_async_issue_pending(dd->dma_lch_in.chan);
484
485 return 0;
486}
487
488static int atmel_tdes_crypt_start(struct atmel_tdes_dev *dd)
13802005 489{
13802005
NR		 490 int err, fast = 0, in, out;
491 size_t count;
492 dma_addr_t addr_in, addr_out;
493
1f858040 494 if ((!dd->in_offset) && (!dd->out_offset)) {
13802005 495 /* check for alignment */
1f858040
NR		 496 in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)) &&
497 IS_ALIGNED(dd->in_sg->length, dd->ctx->block_size);
498 out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)) &&
499 IS_ALIGNED(dd->out_sg->length, dd->ctx->block_size);
13802005 500 fast = in && out;
1f858040
NR		 501
502 if (sg_dma_len(dd->in_sg) != sg_dma_len(dd->out_sg))
503 fast = 0;
13802005
NR		 504 }
505
1f858040 506
13802005 507 if (fast) {
4c147bcf
AB		 508 count = min_t(size_t, dd->total, sg_dma_len(dd->in_sg));
509 count = min_t(size_t, count, sg_dma_len(dd->out_sg));
13802005 510
13802005
NR		 511 err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
512 if (!err) {
817b804c 513 dev_dbg(dd->dev, "dma_map_sg() error\n");
13802005
NR		 514 return -EINVAL;
515 }
516
517 err = dma_map_sg(dd->dev, dd->out_sg, 1,
518 DMA_FROM_DEVICE);
519 if (!err) {
817b804c 520 dev_dbg(dd->dev, "dma_map_sg() error\n");
13802005
NR		 521 dma_unmap_sg(dd->dev, dd->in_sg, 1,
522 DMA_TO_DEVICE);
523 return -EINVAL;
524 }
525
526 addr_in = sg_dma_address(dd->in_sg);
527 addr_out = sg_dma_address(dd->out_sg);
528
529 dd->flags |= TDES_FLAGS_FAST;
530
531 } else {
532 /* use cache buffers */
533 count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset,
534 dd->buf_in, dd->buflen, dd->total, 0);
535
536 addr_in = dd->dma_addr_in;
537 addr_out = dd->dma_addr_out;
538
539 dd->flags &= ~TDES_FLAGS_FAST;
13802005
NR		 540 }
541
542 dd->total -= count;
543
1f858040 544 if (dd->caps.has_dma)
75eca7a7 545 err = atmel_tdes_crypt_dma(dd, addr_in, addr_out, count);
1f858040 546 else
75eca7a7 547 err = atmel_tdes_crypt_pdc(dd, addr_in, addr_out, count);
1f858040
NR		 548
549 if (err && (dd->flags & TDES_FLAGS_FAST)) {
13802005
NR		 550 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
551 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE);
552 }
553
554 return err;
555}
556
61b0dd66
TA		 557static void
558atmel_tdes_set_iv_as_last_ciphertext_block(struct atmel_tdes_dev *dd)
559{
560 struct skcipher_request *req = dd->req;
561 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);
562 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
563 unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
564
565 if (req->cryptlen < ivsize)
566 return;
567
568 if (rctx->mode & TDES_FLAGS_ENCRYPT) {
569 scatterwalk_map_and_copy(req->iv, req->dst,
570 req->cryptlen - ivsize, ivsize, 0);
571 } else {
572 if (req->src == req->dst)
573 memcpy(req->iv, rctx->lastc, ivsize);
574 else
575 scatterwalk_map_and_copy(req->iv, req->src,
576 req->cryptlen - ivsize,
577 ivsize, 0);
578 }
579}
580
13802005
NR		 581static void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err)
582{
967d4910 583 struct skcipher_request *req = dd->req;
c65d1237 584 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);
13802005
NR		 585
586 clk_disable_unprepare(dd->iclk);
587
588 dd->flags &= ~TDES_FLAGS_BUSY;
589
27f4adf7 590 if (!err && (rctx->mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB)
c65d1237 591 atmel_tdes_set_iv_as_last_ciphertext_block(dd);
61b0dd66 592
13802005
NR		 593 req->base.complete(&req->base, err);
594}
595
596static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd,
967d4910 597 struct skcipher_request *req)
13802005
NR		 598{
599 struct crypto_async_request *async_req, *backlog;
600 struct atmel_tdes_ctx *ctx;
601 struct atmel_tdes_reqctx *rctx;
602 unsigned long flags;
603 int err, ret = 0;
604
605 spin_lock_irqsave(&dd->lock, flags);
606 if (req)
967d4910 607 ret = crypto_enqueue_request(&dd->queue, &req->base);
13802005
NR		 608 if (dd->flags & TDES_FLAGS_BUSY) {
609 spin_unlock_irqrestore(&dd->lock, flags);
610 return ret;
611 }
612 backlog = crypto_get_backlog(&dd->queue);
613 async_req = crypto_dequeue_request(&dd->queue);
614 if (async_req)
615 dd->flags |= TDES_FLAGS_BUSY;
616 spin_unlock_irqrestore(&dd->lock, flags);
617
618 if (!async_req)
619 return ret;
620
621 if (backlog)
622 backlog->complete(backlog, -EINPROGRESS);
623
967d4910 624 req = skcipher_request_cast(async_req);
13802005
NR		 625
626 /* assign new request to device */
627 dd->req = req;
967d4910 628 dd->total = req->cryptlen;
13802005
NR		 629 dd->in_offset = 0;
630 dd->in_sg = req->src;
631 dd->out_offset = 0;
632 dd->out_sg = req->dst;
633
967d4910
AB		 634 rctx = skcipher_request_ctx(req);
635 ctx = crypto_skcipher_ctx(crypto_skcipher_reqtfm(req));
13802005
NR		 636 rctx->mode &= TDES_FLAGS_MODE_MASK;
637 dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode;
638 dd->ctx = ctx;
13802005
NR		 639
640 err = atmel_tdes_write_ctrl(dd);
641 if (!err)
1f858040 642 err = atmel_tdes_crypt_start(dd);
13802005
NR		 643 if (err) {
644 /* des_task will not finish it, so do it here */
645 atmel_tdes_finish_req(dd, err);
646 tasklet_schedule(&dd->queue_task);
647 }
648
649 return ret;
650}
651
1f858040
NR		 652static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd)
653{
654 int err = -EINVAL;
655 size_t count;
656
657 if (dd->flags & TDES_FLAGS_DMA) {
658 err = 0;
659 if (dd->flags & TDES_FLAGS_FAST) {
660 dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE);
661 dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE);
662 } else {
663 dma_sync_single_for_device(dd->dev, dd->dma_addr_out,
664 dd->dma_size, DMA_FROM_DEVICE);
665
666 /* copy data */
667 count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset,
668 dd->buf_out, dd->buflen, dd->dma_size, 1);
669 if (count != dd->dma_size) {
670 err = -EINVAL;
817b804c 671 dev_dbg(dd->dev, "not all data converted: %zu\n", count);
1f858040
NR		 672 }
673 }
674 }
675 return err;
676}
13802005 677
967d4910 678static int atmel_tdes_crypt(struct skcipher_request *req, unsigned long mode)
13802005 679{
61b0dd66
TA		 680 struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
681 struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(skcipher);
967d4910 682 struct atmel_tdes_reqctx *rctx = skcipher_request_ctx(req);
817b804c 683 struct device *dev = ctx->dd->dev;
13802005 684
031f5e00
TA		 685 if (!req->cryptlen)
686 return 0;
687
848572f8
TA		 688 switch (mode & TDES_FLAGS_OPMODE_MASK) {
689 case TDES_FLAGS_CFB8:
967d4910 690 if (!IS_ALIGNED(req->cryptlen, CFB8_BLOCK_SIZE)) {
817b804c 691 dev_dbg(dev, "request size is not exact amount of CFB8 blocks\n");
13802005
NR		 692 return -EINVAL;
693 }
1f858040 694 ctx->block_size = CFB8_BLOCK_SIZE;
848572f8
TA		 695 break;
696
697 case TDES_FLAGS_CFB16:
967d4910 698 if (!IS_ALIGNED(req->cryptlen, CFB16_BLOCK_SIZE)) {
817b804c 699 dev_dbg(dev, "request size is not exact amount of CFB16 blocks\n");
13802005
NR		 700 return -EINVAL;
701 }
1f858040 702 ctx->block_size = CFB16_BLOCK_SIZE;
848572f8
TA		 703 break;
704
705 case TDES_FLAGS_CFB32:
967d4910 706 if (!IS_ALIGNED(req->cryptlen, CFB32_BLOCK_SIZE)) {
817b804c 707 dev_dbg(dev, "request size is not exact amount of CFB32 blocks\n");
13802005
NR		 708 return -EINVAL;
709 }
1f858040 710 ctx->block_size = CFB32_BLOCK_SIZE;
848572f8
TA		 711 break;
712
713 default:
967d4910 714 if (!IS_ALIGNED(req->cryptlen, DES_BLOCK_SIZE)) {
817b804c 715 dev_dbg(dev, "request size is not exact amount of DES blocks\n");
1f858040
NR		 716 return -EINVAL;
717 }
718 ctx->block_size = DES_BLOCK_SIZE;
848572f8 719 break;
13802005
NR		 720 }
721
1f858040
NR		 722 rctx->mode = mode;
723
c65d1237
TA		 724 if ((mode & TDES_FLAGS_OPMODE_MASK) != TDES_FLAGS_ECB &&
725 !(mode & TDES_FLAGS_ENCRYPT) && req->src == req->dst) {
61b0dd66
TA		 726 unsigned int ivsize = crypto_skcipher_ivsize(skcipher);
727
728 if (req->cryptlen >= ivsize)
729 scatterwalk_map_and_copy(rctx->lastc, req->src,
730 req->cryptlen - ivsize,
731 ivsize, 0);
732 }
733
1f858040
NR		 734 return atmel_tdes_handle_queue(ctx->dd, req);
735}
736
827a98df 737static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd)
1f858040 738{
45a536e3 739 int ret;
84c8976b
NF		 740
741 /* Try to grab 2 DMA channels */
45a536e3
PU		 742 dd->dma_lch_in.chan = dma_request_chan(dd->dev, "tx");
743 if (IS_ERR(dd->dma_lch_in.chan)) {
744 ret = PTR_ERR(dd->dma_lch_in.chan);
84c8976b 745 goto err_dma_in;
45a536e3 746 }
84c8976b 747
84c8976b
NF		 748 dd->dma_lch_in.dma_conf.dst_addr = dd->phys_base +
749 TDES_IDATA1R;
750 dd->dma_lch_in.dma_conf.src_maxburst = 1;
751 dd->dma_lch_in.dma_conf.src_addr_width =
752 DMA_SLAVE_BUSWIDTH_4_BYTES;
753 dd->dma_lch_in.dma_conf.dst_maxburst = 1;
754 dd->dma_lch_in.dma_conf.dst_addr_width =
755 DMA_SLAVE_BUSWIDTH_4_BYTES;
756 dd->dma_lch_in.dma_conf.device_fc = false;
757
45a536e3
PU		 758 dd->dma_lch_out.chan = dma_request_chan(dd->dev, "rx");
759 if (IS_ERR(dd->dma_lch_out.chan)) {
760 ret = PTR_ERR(dd->dma_lch_out.chan);
84c8976b 761 goto err_dma_out;
45a536e3 762 }
84c8976b 763
84c8976b
NF		 764 dd->dma_lch_out.dma_conf.src_addr = dd->phys_base +
765 TDES_ODATA1R;
766 dd->dma_lch_out.dma_conf.src_maxburst = 1;
767 dd->dma_lch_out.dma_conf.src_addr_width =
768 DMA_SLAVE_BUSWIDTH_4_BYTES;
769 dd->dma_lch_out.dma_conf.dst_maxburst = 1;
770 dd->dma_lch_out.dma_conf.dst_addr_width =
771 DMA_SLAVE_BUSWIDTH_4_BYTES;
772 dd->dma_lch_out.dma_conf.device_fc = false;
1f858040 773
84c8976b 774 return 0;
13802005 775
1f858040
NR		 776err_dma_out:
777 dma_release_channel(dd->dma_lch_in.chan);
778err_dma_in:
e9ce6aee 779 dev_err(dd->dev, "no DMA channel available\n");
45a536e3 780 return ret;
1f858040 781}
13802005 782
1f858040
NR		 783static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd)
784{
785 dma_release_channel(dd->dma_lch_in.chan);
786 dma_release_channel(dd->dma_lch_out.chan);
13802005
NR		 787}
788
967d4910 789static int atmel_des_setkey(struct crypto_skcipher *tfm, const u8 *key,
13802005
NR		 790 unsigned int keylen)
791{
967d4910 792 struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
92c203e2 793 int err;
13802005 794
967d4910 795 err = verify_skcipher_des_key(tfm, key);
92c203e2
AB		 796 if (err)
797 return err;
13802005
NR		 798
799 memcpy(ctx->key, key, keylen);
800 ctx->keylen = keylen;
801
802 return 0;
803}
804
967d4910 805static int atmel_tdes_setkey(struct crypto_skcipher *tfm, const u8 *key,
13802005
NR		 806 unsigned int keylen)
807{
967d4910 808 struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
52ea3cd2 809 int err;
13802005 810
967d4910 811 err = verify_skcipher_des3_key(tfm, key);
92c203e2 812 if (err)
52ea3cd2 813 return err;
13802005
NR		 814
815 memcpy(ctx->key, key, keylen);
816 ctx->keylen = keylen;
817
818 return 0;
819}
820
967d4910 821static int atmel_tdes_ecb_encrypt(struct skcipher_request *req)
13802005 822{
848572f8 823 return atmel_tdes_crypt(req, TDES_FLAGS_ECB | TDES_FLAGS_ENCRYPT);
13802005
NR		 824}
825
967d4910 826static int atmel_tdes_ecb_decrypt(struct skcipher_request *req)
13802005 827{
848572f8 828 return atmel_tdes_crypt(req, TDES_FLAGS_ECB);
13802005
NR		 829}
830
967d4910 831static int atmel_tdes_cbc_encrypt(struct skcipher_request *req)
13802005 832{
848572f8 833 return atmel_tdes_crypt(req, TDES_FLAGS_CBC | TDES_FLAGS_ENCRYPT);
13802005
NR		 834}
835
967d4910 836static int atmel_tdes_cbc_decrypt(struct skcipher_request *req)
13802005
NR		 837{
838 return atmel_tdes_crypt(req, TDES_FLAGS_CBC);
839}
967d4910 840static int atmel_tdes_cfb_encrypt(struct skcipher_request *req)
13802005 841{
848572f8 842 return atmel_tdes_crypt(req, TDES_FLAGS_CFB64 | TDES_FLAGS_ENCRYPT);
13802005
NR		 843}
844
967d4910 845static int atmel_tdes_cfb_decrypt(struct skcipher_request *req)
13802005 846{
848572f8 847 return atmel_tdes_crypt(req, TDES_FLAGS_CFB64);
13802005
NR		 848}
849
967d4910 850static int atmel_tdes_cfb8_encrypt(struct skcipher_request *req)
13802005 851{
848572f8 852 return atmel_tdes_crypt(req, TDES_FLAGS_CFB8 | TDES_FLAGS_ENCRYPT);
13802005
NR		 853}
854
967d4910 855static int atmel_tdes_cfb8_decrypt(struct skcipher_request *req)
13802005 856{
848572f8 857 return atmel_tdes_crypt(req, TDES_FLAGS_CFB8);
13802005
NR		 858}
859
967d4910 860static int atmel_tdes_cfb16_encrypt(struct skcipher_request *req)
13802005 861{
848572f8 862 return atmel_tdes_crypt(req, TDES_FLAGS_CFB16 | TDES_FLAGS_ENCRYPT);
13802005
NR		 863}
864
967d4910 865static int atmel_tdes_cfb16_decrypt(struct skcipher_request *req)
13802005 866{
848572f8 867 return atmel_tdes_crypt(req, TDES_FLAGS_CFB16);
13802005
NR		 868}
869
967d4910 870static int atmel_tdes_cfb32_encrypt(struct skcipher_request *req)
13802005 871{
848572f8 872 return atmel_tdes_crypt(req, TDES_FLAGS_CFB32 | TDES_FLAGS_ENCRYPT);
13802005
NR		 873}
874
967d4910 875static int atmel_tdes_cfb32_decrypt(struct skcipher_request *req)
13802005 876{
848572f8 877 return atmel_tdes_crypt(req, TDES_FLAGS_CFB32);
13802005
NR		 878}
879
967d4910 880static int atmel_tdes_ofb_encrypt(struct skcipher_request *req)
13802005 881{
848572f8 882 return atmel_tdes_crypt(req, TDES_FLAGS_OFB | TDES_FLAGS_ENCRYPT);
13802005
NR		 883}
884
967d4910 885static int atmel_tdes_ofb_decrypt(struct skcipher_request *req)
13802005
NR		 886{
887 return atmel_tdes_crypt(req, TDES_FLAGS_OFB);
888}
889
967d4910 890static int atmel_tdes_init_tfm(struct crypto_skcipher *tfm)
13802005 891{
967d4910 892 struct atmel_tdes_ctx *ctx = crypto_skcipher_ctx(tfm);
1f858040 893
632a761a
TA		 894 ctx->dd = atmel_tdes_dev_alloc();
895 if (!ctx->dd)
1f858040
NR		 896 return -ENODEV;
897
632a761a
TA		 898 crypto_skcipher_set_reqsize(tfm, sizeof(struct atmel_tdes_reqctx));
899
13802005
NR		 900 return 0;
901}
902
aebe5bd7
TA		 903static void atmel_tdes_skcipher_alg_init(struct skcipher_alg *alg)
904{
905 alg->base.cra_priority = ATMEL_TDES_PRIORITY;
906 alg->base.cra_flags = CRYPTO_ALG_ASYNC;
ed4424f2 907 alg->base.cra_ctxsize = sizeof(struct atmel_tdes_ctx);
aebe5bd7
TA		 908 alg->base.cra_module = THIS_MODULE;
909
910 alg->init = atmel_tdes_init_tfm;
911}
912
967d4910 913static struct skcipher_alg tdes_algs[] = {
13802005 914{
967d4910
AB		 915 .base.cra_name = "ecb(des)",
916 .base.cra_driver_name = "atmel-ecb-des",
967d4910 917 .base.cra_blocksize = DES_BLOCK_SIZE,
967d4910 918 .base.cra_alignmask = 0x7,
967d4910 919
967d4910
AB		 920 .min_keysize = DES_KEY_SIZE,
921 .max_keysize = DES_KEY_SIZE,
922 .setkey = atmel_des_setkey,
923 .encrypt = atmel_tdes_ecb_encrypt,
924 .decrypt = atmel_tdes_ecb_decrypt,
13802005
NR		 925},
926{
967d4910
AB		 927 .base.cra_name = "cbc(des)",
928 .base.cra_driver_name = "atmel-cbc-des",
967d4910 929 .base.cra_blocksize = DES_BLOCK_SIZE,
967d4910 930 .base.cra_alignmask = 0x7,
967d4910 931
967d4910
AB		 932 .min_keysize = DES_KEY_SIZE,
933 .max_keysize = DES_KEY_SIZE,
934 .ivsize = DES_BLOCK_SIZE,
935 .setkey = atmel_des_setkey,
936 .encrypt = atmel_tdes_cbc_encrypt,
937 .decrypt = atmel_tdes_cbc_decrypt,
13802005
NR		 938},
939{
967d4910
AB		 940 .base.cra_name = "cfb(des)",
941 .base.cra_driver_name = "atmel-cfb-des",
967d4910 942 .base.cra_blocksize = DES_BLOCK_SIZE,
967d4910 943 .base.cra_alignmask = 0x7,
967d4910 944
967d4910
AB		 945 .min_keysize = DES_KEY_SIZE,
946 .max_keysize = DES_KEY_SIZE,
947 .ivsize = DES_BLOCK_SIZE,
948 .setkey = atmel_des_setkey,
949 .encrypt = atmel_tdes_cfb_encrypt,
950 .decrypt = atmel_tdes_cfb_decrypt,
13802005
NR		 951},
952{
967d4910
AB		 953 .base.cra_name = "cfb8(des)",
954 .base.cra_driver_name = "atmel-cfb8-des",
967d4910 955 .base.cra_blocksize = CFB8_BLOCK_SIZE,
967d4910 956 .base.cra_alignmask = 0,
967d4910 957
967d4910
AB		 958 .min_keysize = DES_KEY_SIZE,
959 .max_keysize = DES_KEY_SIZE,
960 .ivsize = DES_BLOCK_SIZE,
961 .setkey = atmel_des_setkey,
962 .encrypt = atmel_tdes_cfb8_encrypt,
963 .decrypt = atmel_tdes_cfb8_decrypt,
13802005
NR		 964},
965{
967d4910
AB		 966 .base.cra_name = "cfb16(des)",
967 .base.cra_driver_name = "atmel-cfb16-des",
967d4910 968 .base.cra_blocksize = CFB16_BLOCK_SIZE,
967d4910 969 .base.cra_alignmask = 0x1,
967d4910 970
967d4910
AB		 971 .min_keysize = DES_KEY_SIZE,
972 .max_keysize = DES_KEY_SIZE,
973 .ivsize = DES_BLOCK_SIZE,
974 .setkey = atmel_des_setkey,
975 .encrypt = atmel_tdes_cfb16_encrypt,
976 .decrypt = atmel_tdes_cfb16_decrypt,
13802005
NR		 977},
978{
967d4910
AB		 979 .base.cra_name = "cfb32(des)",
980 .base.cra_driver_name = "atmel-cfb32-des",
967d4910 981 .base.cra_blocksize = CFB32_BLOCK_SIZE,
967d4910 982 .base.cra_alignmask = 0x3,
967d4910 983
967d4910
AB		 984 .min_keysize = DES_KEY_SIZE,
985 .max_keysize = DES_KEY_SIZE,
986 .ivsize = DES_BLOCK_SIZE,
987 .setkey = atmel_des_setkey,
988 .encrypt = atmel_tdes_cfb32_encrypt,
989 .decrypt = atmel_tdes_cfb32_decrypt,
13802005
NR		 990},
991{
967d4910
AB		 992 .base.cra_name = "ofb(des)",
993 .base.cra_driver_name = "atmel-ofb-des",
76d579f2 994 .base.cra_blocksize = 1,
967d4910 995 .base.cra_alignmask = 0x7,
967d4910 996
967d4910
AB		 997 .min_keysize = DES_KEY_SIZE,
998 .max_keysize = DES_KEY_SIZE,
999 .ivsize = DES_BLOCK_SIZE,
1000 .setkey = atmel_des_setkey,
1001 .encrypt = atmel_tdes_ofb_encrypt,
1002 .decrypt = atmel_tdes_ofb_decrypt,
13802005
NR		 1003},
1004{
967d4910
AB		 1005 .base.cra_name = "ecb(des3_ede)",
1006 .base.cra_driver_name = "atmel-ecb-tdes",
967d4910 1007 .base.cra_blocksize = DES_BLOCK_SIZE,
967d4910 1008 .base.cra_alignmask = 0x7,
967d4910 1009
967d4910
AB		 1010 .min_keysize = DES3_EDE_KEY_SIZE,
1011 .max_keysize = DES3_EDE_KEY_SIZE,
1012 .setkey = atmel_tdes_setkey,
1013 .encrypt = atmel_tdes_ecb_encrypt,
1014 .decrypt = atmel_tdes_ecb_decrypt,
13802005
NR		 1015},
1016{
967d4910
AB		 1017 .base.cra_name = "cbc(des3_ede)",
1018 .base.cra_driver_name = "atmel-cbc-tdes",
967d4910 1019 .base.cra_blocksize = DES_BLOCK_SIZE,
967d4910 1020 .base.cra_alignmask = 0x7,
967d4910 1021
967d4910
AB		 1022 .min_keysize = DES3_EDE_KEY_SIZE,
1023 .max_keysize = DES3_EDE_KEY_SIZE,
1024 .setkey = atmel_tdes_setkey,
1025 .encrypt = atmel_tdes_cbc_encrypt,
1026 .decrypt = atmel_tdes_cbc_decrypt,
1027 .ivsize = DES_BLOCK_SIZE,
13802005 1028},
13802005 1029{
967d4910
AB		 1030 .base.cra_name = "ofb(des3_ede)",
1031 .base.cra_driver_name = "atmel-ofb-tdes",
967d4910 1032 .base.cra_blocksize = DES_BLOCK_SIZE,
967d4910 1033 .base.cra_alignmask = 0x7,
967d4910 1034
967d4910
AB		 1035 .min_keysize = DES3_EDE_KEY_SIZE,
1036 .max_keysize = DES3_EDE_KEY_SIZE,
1037 .setkey = atmel_tdes_setkey,
1038 .encrypt = atmel_tdes_ofb_encrypt,
1039 .decrypt = atmel_tdes_ofb_decrypt,
1040 .ivsize = DES_BLOCK_SIZE,
13802005
NR		 1041},
1042};
1043
1044static void atmel_tdes_queue_task(unsigned long data)
1045{
1046 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *)data;
1047
1048 atmel_tdes_handle_queue(dd, NULL);
1049}
1050
1051static void atmel_tdes_done_task(unsigned long data)
1052{
1053 struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *) data;
1054 int err;
1055
1f858040
NR		 1056 if (!(dd->flags & TDES_FLAGS_DMA))
1057 err = atmel_tdes_crypt_pdc_stop(dd);
1058 else
1059 err = atmel_tdes_crypt_dma_stop(dd);
13802005 1060
13802005 1061 if (dd->total && !err) {
1f858040
NR		 1062 if (dd->flags & TDES_FLAGS_FAST) {
1063 dd->in_sg = sg_next(dd->in_sg);
1064 dd->out_sg = sg_next(dd->out_sg);
1065 if (!dd->in_sg || !dd->out_sg)
1066 err = -EINVAL;
1067 }
13802005 1068 if (!err)
1f858040
NR		 1069 err = atmel_tdes_crypt_start(dd);
1070 if (!err)
1071 return; /* DMA started. Not fininishing. */
13802005
NR		 1072 }
1073
1074 atmel_tdes_finish_req(dd, err);
1075 atmel_tdes_handle_queue(dd, NULL);
1076}
1077
1078static irqreturn_t atmel_tdes_irq(int irq, void *dev_id)
1079{
1080 struct atmel_tdes_dev *tdes_dd = dev_id;
1081 u32 reg;
1082
1083 reg = atmel_tdes_read(tdes_dd, TDES_ISR);
1084 if (reg & atmel_tdes_read(tdes_dd, TDES_IMR)) {
1085 atmel_tdes_write(tdes_dd, TDES_IDR, reg);
1086 if (TDES_FLAGS_BUSY & tdes_dd->flags)
1087 tasklet_schedule(&tdes_dd->done_task);
1088 else
1089 dev_warn(tdes_dd->dev, "TDES interrupt when no active requests.\n");
1090 return IRQ_HANDLED;
1091 }
1092
1093 return IRQ_NONE;
1094}
1095
1096static void atmel_tdes_unregister_algs(struct atmel_tdes_dev *dd)
1097{
1098 int i;
1099
1100 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++)
967d4910 1101 crypto_unregister_skcipher(&tdes_algs[i]);
13802005
NR		 1102}
1103
1104static int atmel_tdes_register_algs(struct atmel_tdes_dev *dd)
1105{
1106 int err, i, j;
1107
1108 for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) {
aebe5bd7
TA		 1109 atmel_tdes_skcipher_alg_init(&tdes_algs[i]);
1110
967d4910 1111 err = crypto_register_skcipher(&tdes_algs[i]);
13802005
NR		 1112 if (err)
1113 goto err_tdes_algs;
1114 }
1115
1116 return 0;
1117
1118err_tdes_algs:
1119 for (j = 0; j < i; j++)
967d4910 1120 crypto_unregister_skcipher(&tdes_algs[j]);
13802005
NR		 1121
1122 return err;
1123}
1124
1f858040
NR		 1125static void atmel_tdes_get_cap(struct atmel_tdes_dev *dd)
1126{
1127
1128 dd->caps.has_dma = 0;
1129 dd->caps.has_cfb_3keys = 0;
1130
1131 /* keep only major version number */
1132 switch (dd->hw_version & 0xf00) {
e8bf24bd 1133 case 0x800:
1f858040
NR		 1134 case 0x700:
1135 dd->caps.has_dma = 1;
1136 dd->caps.has_cfb_3keys = 1;
1137 break;
1138 case 0x600:
1139 break;
1140 default:
1141 dev_warn(dd->dev,
1142 "Unmanaged tdes version, set minimum capabilities\n");
1143 break;
1144 }
1145}
1146
84c8976b
NF		 1147#if defined(CONFIG_OF)
1148static const struct of_device_id atmel_tdes_dt_ids[] = {
1149 { .compatible = "atmel,at91sam9g46-tdes" },
1150 { /* sentinel */ }
1151};
1152MODULE_DEVICE_TABLE(of, atmel_tdes_dt_ids);
84c8976b
NF		 1153#endif
1154
49cfe4db 1155static int atmel_tdes_probe(struct platform_device *pdev)
13802005
NR		 1156{
1157 struct atmel_tdes_dev *tdes_dd;
1158 struct device *dev = &pdev->dev;
1159 struct resource *tdes_res;
13802005
NR		 1160 int err;
1161
c659d07f 1162 tdes_dd = devm_kmalloc(&pdev->dev, sizeof(*tdes_dd), GFP_KERNEL);
c9063a02
TA		 1163 if (!tdes_dd)
1164 return -ENOMEM;
13802005
NR		 1165
1166 tdes_dd->dev = dev;
1167
1168 platform_set_drvdata(pdev, tdes_dd);
1169
1170 INIT_LIST_HEAD(&tdes_dd->list);
1d1b9163 1171 spin_lock_init(&tdes_dd->lock);
13802005
NR		 1172
1173 tasklet_init(&tdes_dd->done_task, atmel_tdes_done_task,
1174 (unsigned long)tdes_dd);
1175 tasklet_init(&tdes_dd->queue_task, atmel_tdes_queue_task,
1176 (unsigned long)tdes_dd);
1177
1178 crypto_init_queue(&tdes_dd->queue, ATMEL_TDES_QUEUE_LENGTH);
1179
13802005
NR		 1180 /* Get the base address */
1181 tdes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1182 if (!tdes_res) {
1183 dev_err(dev, "no MEM resource info\n");
1184 err = -ENODEV;
e7836518 1185 goto err_tasklet_kill;
13802005
NR		 1186 }
1187 tdes_dd->phys_base = tdes_res->start;
13802005
NR		 1188
1189 /* Get the IRQ */
1190 tdes_dd->irq = platform_get_irq(pdev, 0);
1191 if (tdes_dd->irq < 0) {
13802005 1192 err = tdes_dd->irq;
e7836518 1193 goto err_tasklet_kill;
13802005
NR		 1194 }
1195
b0e8b341
LC		 1196 err = devm_request_irq(&pdev->dev, tdes_dd->irq, atmel_tdes_irq,
1197 IRQF_SHARED, "atmel-tdes", tdes_dd);
13802005
NR		 1198 if (err) {
1199 dev_err(dev, "unable to request tdes irq.\n");
e7836518 1200 goto err_tasklet_kill;
13802005
NR		 1201 }
1202
1203 /* Initializing the clock */
b0e8b341 1204 tdes_dd->iclk = devm_clk_get(&pdev->dev, "tdes_clk");
13802005 1205 if (IS_ERR(tdes_dd->iclk)) {
be208356 1206 dev_err(dev, "clock initialization failed.\n");
13802005 1207 err = PTR_ERR(tdes_dd->iclk);
e7836518 1208 goto err_tasklet_kill;
13802005
NR		 1209 }
1210
b0e8b341 1211 tdes_dd->io_base = devm_ioremap_resource(&pdev->dev, tdes_res);
9b52d55f 1212 if (IS_ERR(tdes_dd->io_base)) {
9b52d55f 1213 err = PTR_ERR(tdes_dd->io_base);
e7836518 1214 goto err_tasklet_kill;
13802005
NR		 1215 }
1216
0efe58f3
TA		 1217 err = atmel_tdes_hw_version_init(tdes_dd);
1218 if (err)
e7836518 1219 goto err_tasklet_kill;
1f858040
NR		 1220
1221 atmel_tdes_get_cap(tdes_dd);
1222
1223 err = atmel_tdes_buff_init(tdes_dd);
13802005 1224 if (err)
e7836518 1225 goto err_tasklet_kill;
1f858040
NR		 1226
1227 if (tdes_dd->caps.has_dma) {
827a98df 1228 err = atmel_tdes_dma_init(tdes_dd);
1f858040 1229 if (err)
e7836518 1230 goto err_buff_cleanup;
84c8976b
NF		 1231
1232 dev_info(dev, "using %s, %s for DMA transfers\n",
1233 dma_chan_name(tdes_dd->dma_lch_in.chan),
1234 dma_chan_name(tdes_dd->dma_lch_out.chan));
1f858040 1235 }
13802005
NR		 1236
1237 spin_lock(&atmel_tdes.lock);
1238 list_add_tail(&tdes_dd->list, &atmel_tdes.dev_list);
1239 spin_unlock(&atmel_tdes.lock);
1240
1241 err = atmel_tdes_register_algs(tdes_dd);
1242 if (err)
1243 goto err_algs;
1244
1245 dev_info(dev, "Atmel DES/TDES\n");
1246
1247 return 0;
1248
1249err_algs:
1250 spin_lock(&atmel_tdes.lock);
1251 list_del(&tdes_dd->list);
1252 spin_unlock(&atmel_tdes.lock);
1f858040
NR		 1253 if (tdes_dd->caps.has_dma)
1254 atmel_tdes_dma_cleanup(tdes_dd);
e7836518 1255err_buff_cleanup:
1f858040 1256 atmel_tdes_buff_cleanup(tdes_dd);
e7836518 1257err_tasklet_kill:
13802005
NR		 1258 tasklet_kill(&tdes_dd->done_task);
1259 tasklet_kill(&tdes_dd->queue_task);
13802005
NR		 1260
1261 return err;
1262}
1263
49cfe4db 1264static int atmel_tdes_remove(struct platform_device *pdev)
13802005 1265{
47f1241e 1266 struct atmel_tdes_dev *tdes_dd;
13802005
NR		 1267
1268 tdes_dd = platform_get_drvdata(pdev);
515f4fc6 1269
13802005
NR		 1270 spin_lock(&atmel_tdes.lock);
1271 list_del(&tdes_dd->list);
1272 spin_unlock(&atmel_tdes.lock);
1273
1274 atmel_tdes_unregister_algs(tdes_dd);
1275
1276 tasklet_kill(&tdes_dd->done_task);
1277 tasklet_kill(&tdes_dd->queue_task);
1278
1f858040
NR		 1279 if (tdes_dd->caps.has_dma)
1280 atmel_tdes_dma_cleanup(tdes_dd);
1281
1282 atmel_tdes_buff_cleanup(tdes_dd);
13802005 1283
13802005
NR		 1284 return 0;
1285}
1286
1287static struct platform_driver atmel_tdes_driver = {
1288 .probe = atmel_tdes_probe,
49cfe4db 1289 .remove = atmel_tdes_remove,
13802005
NR		 1290 .driver = {
1291 .name = "atmel_tdes",
84c8976b 1292 .of_match_table = of_match_ptr(atmel_tdes_dt_ids),
13802005
NR		 1293 },
1294};
1295
1296module_platform_driver(atmel_tdes_driver);
1297
1298MODULE_DESCRIPTION("Atmel DES/TDES hw acceleration support.");
1299MODULE_LICENSE("GPL v2");
1300MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique");
Michael's Linux tree.