Nicolas Royer | 1380200 | 2012-07-01 19:19:45 +0200 | [diff] [blame] | 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> |
Nicolas Royer | 1380200 | 2012-07-01 19:19:45 +0200 | [diff] [blame] | 27 | #include <linux/init.h> |
| 28 | #include <linux/errno.h> |
| 29 | #include <linux/interrupt.h> |
Nicolas Royer | 1380200 | 2012-07-01 19:19:45 +0200 | [diff] [blame] | 30 | #include <linux/irq.h> |
Nicolas Royer | 1380200 | 2012-07-01 19:19:45 +0200 | [diff] [blame] | 31 | #include <linux/scatterlist.h> |
| 32 | #include <linux/dma-mapping.h> |
| 33 | #include <linux/delay.h> |
| 34 | #include <linux/crypto.h> |
| 35 | #include <linux/cryptohash.h> |
| 36 | #include <crypto/scatterwalk.h> |
| 37 | #include <crypto/algapi.h> |
| 38 | #include <crypto/des.h> |
| 39 | #include <crypto/hash.h> |
| 40 | #include <crypto/internal/hash.h> |
| 41 | #include "atmel-tdes-regs.h" |
| 42 | |
| 43 | /* TDES flags */ |
| 44 | #define TDES_FLAGS_MODE_MASK 0x007f |
| 45 | #define TDES_FLAGS_ENCRYPT BIT(0) |
| 46 | #define TDES_FLAGS_CBC BIT(1) |
| 47 | #define TDES_FLAGS_CFB BIT(2) |
| 48 | #define TDES_FLAGS_CFB8 BIT(3) |
| 49 | #define TDES_FLAGS_CFB16 BIT(4) |
| 50 | #define TDES_FLAGS_CFB32 BIT(5) |
| 51 | #define TDES_FLAGS_OFB BIT(6) |
| 52 | |
| 53 | #define TDES_FLAGS_INIT BIT(16) |
| 54 | #define TDES_FLAGS_FAST BIT(17) |
| 55 | #define TDES_FLAGS_BUSY BIT(18) |
| 56 | |
| 57 | #define ATMEL_TDES_QUEUE_LENGTH 1 |
| 58 | |
| 59 | #define CFB8_BLOCK_SIZE 1 |
| 60 | #define CFB16_BLOCK_SIZE 2 |
| 61 | #define CFB32_BLOCK_SIZE 4 |
| 62 | #define CFB64_BLOCK_SIZE 8 |
| 63 | |
| 64 | |
| 65 | struct atmel_tdes_dev; |
| 66 | |
| 67 | struct atmel_tdes_ctx { |
| 68 | struct atmel_tdes_dev *dd; |
| 69 | |
| 70 | int keylen; |
| 71 | u32 key[3*DES_KEY_SIZE / sizeof(u32)]; |
| 72 | unsigned long flags; |
| 73 | }; |
| 74 | |
| 75 | struct atmel_tdes_reqctx { |
| 76 | unsigned long mode; |
| 77 | }; |
| 78 | |
| 79 | struct atmel_tdes_dev { |
| 80 | struct list_head list; |
| 81 | unsigned long phys_base; |
| 82 | void __iomem *io_base; |
| 83 | |
| 84 | struct atmel_tdes_ctx *ctx; |
| 85 | struct device *dev; |
| 86 | struct clk *iclk; |
| 87 | int irq; |
| 88 | |
| 89 | unsigned long flags; |
| 90 | int err; |
| 91 | |
| 92 | spinlock_t lock; |
| 93 | struct crypto_queue queue; |
| 94 | |
| 95 | struct tasklet_struct done_task; |
| 96 | struct tasklet_struct queue_task; |
| 97 | |
| 98 | struct ablkcipher_request *req; |
| 99 | size_t total; |
| 100 | |
| 101 | struct scatterlist *in_sg; |
| 102 | size_t in_offset; |
| 103 | struct scatterlist *out_sg; |
| 104 | size_t out_offset; |
| 105 | |
| 106 | size_t buflen; |
| 107 | size_t dma_size; |
| 108 | |
| 109 | void *buf_in; |
| 110 | int dma_in; |
| 111 | dma_addr_t dma_addr_in; |
| 112 | |
| 113 | void *buf_out; |
| 114 | int dma_out; |
| 115 | dma_addr_t dma_addr_out; |
| 116 | }; |
| 117 | |
| 118 | struct atmel_tdes_drv { |
| 119 | struct list_head dev_list; |
| 120 | spinlock_t lock; |
| 121 | }; |
| 122 | |
| 123 | static struct atmel_tdes_drv atmel_tdes = { |
| 124 | .dev_list = LIST_HEAD_INIT(atmel_tdes.dev_list), |
| 125 | .lock = __SPIN_LOCK_UNLOCKED(atmel_tdes.lock), |
| 126 | }; |
| 127 | |
| 128 | static int atmel_tdes_sg_copy(struct scatterlist **sg, size_t *offset, |
| 129 | void *buf, size_t buflen, size_t total, int out) |
| 130 | { |
| 131 | unsigned int count, off = 0; |
| 132 | |
| 133 | while (buflen && total) { |
| 134 | count = min((*sg)->length - *offset, total); |
| 135 | count = min(count, buflen); |
| 136 | |
| 137 | if (!count) |
| 138 | return off; |
| 139 | |
| 140 | scatterwalk_map_and_copy(buf + off, *sg, *offset, count, out); |
| 141 | |
| 142 | off += count; |
| 143 | buflen -= count; |
| 144 | *offset += count; |
| 145 | total -= count; |
| 146 | |
| 147 | if (*offset == (*sg)->length) { |
| 148 | *sg = sg_next(*sg); |
| 149 | if (*sg) |
| 150 | *offset = 0; |
| 151 | else |
| 152 | total = 0; |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | return off; |
| 157 | } |
| 158 | |
| 159 | static inline u32 atmel_tdes_read(struct atmel_tdes_dev *dd, u32 offset) |
| 160 | { |
| 161 | return readl_relaxed(dd->io_base + offset); |
| 162 | } |
| 163 | |
| 164 | static inline void atmel_tdes_write(struct atmel_tdes_dev *dd, |
| 165 | u32 offset, u32 value) |
| 166 | { |
| 167 | writel_relaxed(value, dd->io_base + offset); |
| 168 | } |
| 169 | |
| 170 | static void atmel_tdes_write_n(struct atmel_tdes_dev *dd, u32 offset, |
| 171 | u32 *value, int count) |
| 172 | { |
| 173 | for (; count--; value++, offset += 4) |
| 174 | atmel_tdes_write(dd, offset, *value); |
| 175 | } |
| 176 | |
| 177 | static struct atmel_tdes_dev *atmel_tdes_find_dev(struct atmel_tdes_ctx *ctx) |
| 178 | { |
| 179 | struct atmel_tdes_dev *tdes_dd = NULL; |
| 180 | struct atmel_tdes_dev *tmp; |
| 181 | |
| 182 | spin_lock_bh(&atmel_tdes.lock); |
| 183 | if (!ctx->dd) { |
| 184 | list_for_each_entry(tmp, &atmel_tdes.dev_list, list) { |
| 185 | tdes_dd = tmp; |
| 186 | break; |
| 187 | } |
| 188 | ctx->dd = tdes_dd; |
| 189 | } else { |
| 190 | tdes_dd = ctx->dd; |
| 191 | } |
| 192 | spin_unlock_bh(&atmel_tdes.lock); |
| 193 | |
| 194 | return tdes_dd; |
| 195 | } |
| 196 | |
| 197 | static int atmel_tdes_hw_init(struct atmel_tdes_dev *dd) |
| 198 | { |
| 199 | clk_prepare_enable(dd->iclk); |
| 200 | |
| 201 | if (!(dd->flags & TDES_FLAGS_INIT)) { |
| 202 | atmel_tdes_write(dd, TDES_CR, TDES_CR_SWRST); |
| 203 | dd->flags |= TDES_FLAGS_INIT; |
| 204 | dd->err = 0; |
| 205 | } |
| 206 | |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | static int atmel_tdes_write_ctrl(struct atmel_tdes_dev *dd) |
| 211 | { |
| 212 | int err; |
| 213 | u32 valcr = 0, valmr = TDES_MR_SMOD_PDC; |
| 214 | |
| 215 | err = atmel_tdes_hw_init(dd); |
| 216 | |
| 217 | if (err) |
| 218 | return err; |
| 219 | |
| 220 | atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS); |
| 221 | |
| 222 | /* MR register must be set before IV registers */ |
| 223 | if (dd->ctx->keylen > (DES_KEY_SIZE << 1)) { |
| 224 | valmr |= TDES_MR_KEYMOD_3KEY; |
| 225 | valmr |= TDES_MR_TDESMOD_TDES; |
| 226 | } else if (dd->ctx->keylen > DES_KEY_SIZE) { |
| 227 | valmr |= TDES_MR_KEYMOD_2KEY; |
| 228 | valmr |= TDES_MR_TDESMOD_TDES; |
| 229 | } else { |
| 230 | valmr |= TDES_MR_TDESMOD_DES; |
| 231 | } |
| 232 | |
| 233 | if (dd->flags & TDES_FLAGS_CBC) { |
| 234 | valmr |= TDES_MR_OPMOD_CBC; |
| 235 | } else if (dd->flags & TDES_FLAGS_CFB) { |
| 236 | valmr |= TDES_MR_OPMOD_CFB; |
| 237 | |
| 238 | if (dd->flags & TDES_FLAGS_CFB8) |
| 239 | valmr |= TDES_MR_CFBS_8b; |
| 240 | else if (dd->flags & TDES_FLAGS_CFB16) |
| 241 | valmr |= TDES_MR_CFBS_16b; |
| 242 | else if (dd->flags & TDES_FLAGS_CFB32) |
| 243 | valmr |= TDES_MR_CFBS_32b; |
| 244 | } else if (dd->flags & TDES_FLAGS_OFB) { |
| 245 | valmr |= TDES_MR_OPMOD_OFB; |
| 246 | } |
| 247 | |
| 248 | if ((dd->flags & TDES_FLAGS_ENCRYPT) || (dd->flags & TDES_FLAGS_OFB)) |
| 249 | valmr |= TDES_MR_CYPHER_ENC; |
| 250 | |
| 251 | atmel_tdes_write(dd, TDES_CR, valcr); |
| 252 | atmel_tdes_write(dd, TDES_MR, valmr); |
| 253 | |
| 254 | atmel_tdes_write_n(dd, TDES_KEY1W1R, dd->ctx->key, |
| 255 | dd->ctx->keylen >> 2); |
| 256 | |
| 257 | if (((dd->flags & TDES_FLAGS_CBC) || (dd->flags & TDES_FLAGS_CFB) || |
| 258 | (dd->flags & TDES_FLAGS_OFB)) && dd->req->info) { |
| 259 | atmel_tdes_write_n(dd, TDES_IV1R, dd->req->info, 2); |
| 260 | } |
| 261 | |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | static int atmel_tdes_crypt_dma_stop(struct atmel_tdes_dev *dd) |
| 266 | { |
| 267 | int err = 0; |
| 268 | size_t count; |
| 269 | |
| 270 | atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS); |
| 271 | |
| 272 | if (dd->flags & TDES_FLAGS_FAST) { |
| 273 | dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_FROM_DEVICE); |
| 274 | dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); |
| 275 | } else { |
| 276 | dma_sync_single_for_device(dd->dev, dd->dma_addr_out, |
| 277 | dd->dma_size, DMA_FROM_DEVICE); |
| 278 | |
| 279 | /* copy data */ |
| 280 | count = atmel_tdes_sg_copy(&dd->out_sg, &dd->out_offset, |
| 281 | dd->buf_out, dd->buflen, dd->dma_size, 1); |
| 282 | if (count != dd->dma_size) { |
| 283 | err = -EINVAL; |
| 284 | pr_err("not all data converted: %u\n", count); |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | return err; |
| 289 | } |
| 290 | |
| 291 | static int atmel_tdes_dma_init(struct atmel_tdes_dev *dd) |
| 292 | { |
| 293 | int err = -ENOMEM; |
| 294 | |
| 295 | dd->buf_in = (void *)__get_free_pages(GFP_KERNEL, 0); |
| 296 | dd->buf_out = (void *)__get_free_pages(GFP_KERNEL, 0); |
| 297 | dd->buflen = PAGE_SIZE; |
| 298 | dd->buflen &= ~(DES_BLOCK_SIZE - 1); |
| 299 | |
| 300 | if (!dd->buf_in || !dd->buf_out) { |
| 301 | dev_err(dd->dev, "unable to alloc pages.\n"); |
| 302 | goto err_alloc; |
| 303 | } |
| 304 | |
| 305 | /* MAP here */ |
| 306 | dd->dma_addr_in = dma_map_single(dd->dev, dd->buf_in, |
| 307 | dd->buflen, DMA_TO_DEVICE); |
| 308 | if (dma_mapping_error(dd->dev, dd->dma_addr_in)) { |
| 309 | dev_err(dd->dev, "dma %d bytes error\n", dd->buflen); |
| 310 | err = -EINVAL; |
| 311 | goto err_map_in; |
| 312 | } |
| 313 | |
| 314 | dd->dma_addr_out = dma_map_single(dd->dev, dd->buf_out, |
| 315 | dd->buflen, DMA_FROM_DEVICE); |
| 316 | if (dma_mapping_error(dd->dev, dd->dma_addr_out)) { |
| 317 | dev_err(dd->dev, "dma %d bytes error\n", dd->buflen); |
| 318 | err = -EINVAL; |
| 319 | goto err_map_out; |
| 320 | } |
| 321 | |
| 322 | return 0; |
| 323 | |
| 324 | err_map_out: |
| 325 | dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen, |
| 326 | DMA_TO_DEVICE); |
| 327 | err_map_in: |
| 328 | free_page((unsigned long)dd->buf_out); |
| 329 | free_page((unsigned long)dd->buf_in); |
| 330 | err_alloc: |
| 331 | if (err) |
| 332 | pr_err("error: %d\n", err); |
| 333 | return err; |
| 334 | } |
| 335 | |
| 336 | static void atmel_tdes_dma_cleanup(struct atmel_tdes_dev *dd) |
| 337 | { |
| 338 | dma_unmap_single(dd->dev, dd->dma_addr_out, dd->buflen, |
| 339 | DMA_FROM_DEVICE); |
| 340 | dma_unmap_single(dd->dev, dd->dma_addr_in, dd->buflen, |
| 341 | DMA_TO_DEVICE); |
| 342 | free_page((unsigned long)dd->buf_out); |
| 343 | free_page((unsigned long)dd->buf_in); |
| 344 | } |
| 345 | |
| 346 | static int atmel_tdes_crypt_dma(struct crypto_tfm *tfm, dma_addr_t dma_addr_in, |
| 347 | dma_addr_t dma_addr_out, int length) |
| 348 | { |
| 349 | struct atmel_tdes_ctx *ctx = crypto_tfm_ctx(tfm); |
| 350 | struct atmel_tdes_dev *dd = ctx->dd; |
| 351 | int len32; |
| 352 | |
| 353 | dd->dma_size = length; |
| 354 | |
| 355 | if (!(dd->flags & TDES_FLAGS_FAST)) { |
| 356 | dma_sync_single_for_device(dd->dev, dma_addr_in, length, |
| 357 | DMA_TO_DEVICE); |
| 358 | } |
| 359 | |
| 360 | if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB8)) |
| 361 | len32 = DIV_ROUND_UP(length, sizeof(u8)); |
| 362 | else if ((dd->flags & TDES_FLAGS_CFB) && (dd->flags & TDES_FLAGS_CFB16)) |
| 363 | len32 = DIV_ROUND_UP(length, sizeof(u16)); |
| 364 | else |
| 365 | len32 = DIV_ROUND_UP(length, sizeof(u32)); |
| 366 | |
| 367 | atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTDIS|TDES_PTCR_RXTDIS); |
| 368 | atmel_tdes_write(dd, TDES_TPR, dma_addr_in); |
| 369 | atmel_tdes_write(dd, TDES_TCR, len32); |
| 370 | atmel_tdes_write(dd, TDES_RPR, dma_addr_out); |
| 371 | atmel_tdes_write(dd, TDES_RCR, len32); |
| 372 | |
| 373 | /* Enable Interrupt */ |
| 374 | atmel_tdes_write(dd, TDES_IER, TDES_INT_ENDRX); |
| 375 | |
| 376 | /* Start DMA transfer */ |
| 377 | atmel_tdes_write(dd, TDES_PTCR, TDES_PTCR_TXTEN | TDES_PTCR_RXTEN); |
| 378 | |
| 379 | return 0; |
| 380 | } |
| 381 | |
| 382 | static int atmel_tdes_crypt_dma_start(struct atmel_tdes_dev *dd) |
| 383 | { |
| 384 | struct crypto_tfm *tfm = crypto_ablkcipher_tfm( |
| 385 | crypto_ablkcipher_reqtfm(dd->req)); |
| 386 | int err, fast = 0, in, out; |
| 387 | size_t count; |
| 388 | dma_addr_t addr_in, addr_out; |
| 389 | |
| 390 | if (sg_is_last(dd->in_sg) && sg_is_last(dd->out_sg)) { |
| 391 | /* check for alignment */ |
| 392 | in = IS_ALIGNED((u32)dd->in_sg->offset, sizeof(u32)); |
| 393 | out = IS_ALIGNED((u32)dd->out_sg->offset, sizeof(u32)); |
| 394 | |
| 395 | fast = in && out; |
| 396 | } |
| 397 | |
| 398 | if (fast) { |
| 399 | count = min(dd->total, sg_dma_len(dd->in_sg)); |
| 400 | count = min(count, sg_dma_len(dd->out_sg)); |
| 401 | |
| 402 | if (count != dd->total) { |
| 403 | pr_err("request length != buffer length\n"); |
| 404 | return -EINVAL; |
| 405 | } |
| 406 | |
| 407 | err = dma_map_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); |
| 408 | if (!err) { |
| 409 | dev_err(dd->dev, "dma_map_sg() error\n"); |
| 410 | return -EINVAL; |
| 411 | } |
| 412 | |
| 413 | err = dma_map_sg(dd->dev, dd->out_sg, 1, |
| 414 | DMA_FROM_DEVICE); |
| 415 | if (!err) { |
| 416 | dev_err(dd->dev, "dma_map_sg() error\n"); |
| 417 | dma_unmap_sg(dd->dev, dd->in_sg, 1, |
| 418 | DMA_TO_DEVICE); |
| 419 | return -EINVAL; |
| 420 | } |
| 421 | |
| 422 | addr_in = sg_dma_address(dd->in_sg); |
| 423 | addr_out = sg_dma_address(dd->out_sg); |
| 424 | |
| 425 | dd->flags |= TDES_FLAGS_FAST; |
| 426 | |
| 427 | } else { |
| 428 | /* use cache buffers */ |
| 429 | count = atmel_tdes_sg_copy(&dd->in_sg, &dd->in_offset, |
| 430 | dd->buf_in, dd->buflen, dd->total, 0); |
| 431 | |
| 432 | addr_in = dd->dma_addr_in; |
| 433 | addr_out = dd->dma_addr_out; |
| 434 | |
| 435 | dd->flags &= ~TDES_FLAGS_FAST; |
| 436 | |
| 437 | } |
| 438 | |
| 439 | dd->total -= count; |
| 440 | |
| 441 | err = atmel_tdes_crypt_dma(tfm, addr_in, addr_out, count); |
| 442 | if (err) { |
| 443 | dma_unmap_sg(dd->dev, dd->in_sg, 1, DMA_TO_DEVICE); |
| 444 | dma_unmap_sg(dd->dev, dd->out_sg, 1, DMA_TO_DEVICE); |
| 445 | } |
| 446 | |
| 447 | return err; |
| 448 | } |
| 449 | |
| 450 | |
| 451 | static void atmel_tdes_finish_req(struct atmel_tdes_dev *dd, int err) |
| 452 | { |
| 453 | struct ablkcipher_request *req = dd->req; |
| 454 | |
| 455 | clk_disable_unprepare(dd->iclk); |
| 456 | |
| 457 | dd->flags &= ~TDES_FLAGS_BUSY; |
| 458 | |
| 459 | req->base.complete(&req->base, err); |
| 460 | } |
| 461 | |
| 462 | static int atmel_tdes_handle_queue(struct atmel_tdes_dev *dd, |
| 463 | struct ablkcipher_request *req) |
| 464 | { |
| 465 | struct crypto_async_request *async_req, *backlog; |
| 466 | struct atmel_tdes_ctx *ctx; |
| 467 | struct atmel_tdes_reqctx *rctx; |
| 468 | unsigned long flags; |
| 469 | int err, ret = 0; |
| 470 | |
| 471 | spin_lock_irqsave(&dd->lock, flags); |
| 472 | if (req) |
| 473 | ret = ablkcipher_enqueue_request(&dd->queue, req); |
| 474 | if (dd->flags & TDES_FLAGS_BUSY) { |
| 475 | spin_unlock_irqrestore(&dd->lock, flags); |
| 476 | return ret; |
| 477 | } |
| 478 | backlog = crypto_get_backlog(&dd->queue); |
| 479 | async_req = crypto_dequeue_request(&dd->queue); |
| 480 | if (async_req) |
| 481 | dd->flags |= TDES_FLAGS_BUSY; |
| 482 | spin_unlock_irqrestore(&dd->lock, flags); |
| 483 | |
| 484 | if (!async_req) |
| 485 | return ret; |
| 486 | |
| 487 | if (backlog) |
| 488 | backlog->complete(backlog, -EINPROGRESS); |
| 489 | |
| 490 | req = ablkcipher_request_cast(async_req); |
| 491 | |
| 492 | /* assign new request to device */ |
| 493 | dd->req = req; |
| 494 | dd->total = req->nbytes; |
| 495 | dd->in_offset = 0; |
| 496 | dd->in_sg = req->src; |
| 497 | dd->out_offset = 0; |
| 498 | dd->out_sg = req->dst; |
| 499 | |
| 500 | rctx = ablkcipher_request_ctx(req); |
| 501 | ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req)); |
| 502 | rctx->mode &= TDES_FLAGS_MODE_MASK; |
| 503 | dd->flags = (dd->flags & ~TDES_FLAGS_MODE_MASK) | rctx->mode; |
| 504 | dd->ctx = ctx; |
| 505 | ctx->dd = dd; |
| 506 | |
| 507 | err = atmel_tdes_write_ctrl(dd); |
| 508 | if (!err) |
| 509 | err = atmel_tdes_crypt_dma_start(dd); |
| 510 | if (err) { |
| 511 | /* des_task will not finish it, so do it here */ |
| 512 | atmel_tdes_finish_req(dd, err); |
| 513 | tasklet_schedule(&dd->queue_task); |
| 514 | } |
| 515 | |
| 516 | return ret; |
| 517 | } |
| 518 | |
| 519 | |
| 520 | static int atmel_tdes_crypt(struct ablkcipher_request *req, unsigned long mode) |
| 521 | { |
| 522 | struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx( |
| 523 | crypto_ablkcipher_reqtfm(req)); |
| 524 | struct atmel_tdes_reqctx *rctx = ablkcipher_request_ctx(req); |
| 525 | struct atmel_tdes_dev *dd; |
| 526 | |
| 527 | if (mode & TDES_FLAGS_CFB8) { |
| 528 | if (!IS_ALIGNED(req->nbytes, CFB8_BLOCK_SIZE)) { |
| 529 | pr_err("request size is not exact amount of CFB8 blocks\n"); |
| 530 | return -EINVAL; |
| 531 | } |
| 532 | } else if (mode & TDES_FLAGS_CFB16) { |
| 533 | if (!IS_ALIGNED(req->nbytes, CFB16_BLOCK_SIZE)) { |
| 534 | pr_err("request size is not exact amount of CFB16 blocks\n"); |
| 535 | return -EINVAL; |
| 536 | } |
| 537 | } else if (mode & TDES_FLAGS_CFB32) { |
| 538 | if (!IS_ALIGNED(req->nbytes, CFB32_BLOCK_SIZE)) { |
| 539 | pr_err("request size is not exact amount of CFB32 blocks\n"); |
| 540 | return -EINVAL; |
| 541 | } |
| 542 | } else if (!IS_ALIGNED(req->nbytes, DES_BLOCK_SIZE)) { |
| 543 | pr_err("request size is not exact amount of DES blocks\n"); |
| 544 | return -EINVAL; |
| 545 | } |
| 546 | |
| 547 | dd = atmel_tdes_find_dev(ctx); |
| 548 | if (!dd) |
| 549 | return -ENODEV; |
| 550 | |
| 551 | rctx->mode = mode; |
| 552 | |
| 553 | return atmel_tdes_handle_queue(dd, req); |
| 554 | } |
| 555 | |
| 556 | static int atmel_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key, |
| 557 | unsigned int keylen) |
| 558 | { |
| 559 | u32 tmp[DES_EXPKEY_WORDS]; |
| 560 | int err; |
| 561 | struct crypto_tfm *ctfm = crypto_ablkcipher_tfm(tfm); |
| 562 | |
| 563 | struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm); |
| 564 | |
| 565 | if (keylen != DES_KEY_SIZE) { |
| 566 | crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); |
| 567 | return -EINVAL; |
| 568 | } |
| 569 | |
| 570 | err = des_ekey(tmp, key); |
| 571 | if (err == 0 && (ctfm->crt_flags & CRYPTO_TFM_REQ_WEAK_KEY)) { |
| 572 | ctfm->crt_flags |= CRYPTO_TFM_RES_WEAK_KEY; |
| 573 | return -EINVAL; |
| 574 | } |
| 575 | |
| 576 | memcpy(ctx->key, key, keylen); |
| 577 | ctx->keylen = keylen; |
| 578 | |
| 579 | return 0; |
| 580 | } |
| 581 | |
| 582 | static int atmel_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key, |
| 583 | unsigned int keylen) |
| 584 | { |
| 585 | struct atmel_tdes_ctx *ctx = crypto_ablkcipher_ctx(tfm); |
| 586 | const char *alg_name; |
| 587 | |
| 588 | alg_name = crypto_tfm_alg_name(crypto_ablkcipher_tfm(tfm)); |
| 589 | |
| 590 | /* |
| 591 | * HW bug in cfb 3-keys mode. |
| 592 | */ |
| 593 | if (strstr(alg_name, "cfb") && (keylen != 2*DES_KEY_SIZE)) { |
| 594 | crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); |
| 595 | return -EINVAL; |
| 596 | } else if ((keylen != 2*DES_KEY_SIZE) && (keylen != 3*DES_KEY_SIZE)) { |
| 597 | crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); |
| 598 | return -EINVAL; |
| 599 | } |
| 600 | |
| 601 | memcpy(ctx->key, key, keylen); |
| 602 | ctx->keylen = keylen; |
| 603 | |
| 604 | return 0; |
| 605 | } |
| 606 | |
| 607 | static int atmel_tdes_ecb_encrypt(struct ablkcipher_request *req) |
| 608 | { |
| 609 | return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT); |
| 610 | } |
| 611 | |
| 612 | static int atmel_tdes_ecb_decrypt(struct ablkcipher_request *req) |
| 613 | { |
| 614 | return atmel_tdes_crypt(req, 0); |
| 615 | } |
| 616 | |
| 617 | static int atmel_tdes_cbc_encrypt(struct ablkcipher_request *req) |
| 618 | { |
| 619 | return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CBC); |
| 620 | } |
| 621 | |
| 622 | static int atmel_tdes_cbc_decrypt(struct ablkcipher_request *req) |
| 623 | { |
| 624 | return atmel_tdes_crypt(req, TDES_FLAGS_CBC); |
| 625 | } |
| 626 | static int atmel_tdes_cfb_encrypt(struct ablkcipher_request *req) |
| 627 | { |
| 628 | return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB); |
| 629 | } |
| 630 | |
| 631 | static int atmel_tdes_cfb_decrypt(struct ablkcipher_request *req) |
| 632 | { |
| 633 | return atmel_tdes_crypt(req, TDES_FLAGS_CFB); |
| 634 | } |
| 635 | |
| 636 | static int atmel_tdes_cfb8_encrypt(struct ablkcipher_request *req) |
| 637 | { |
| 638 | return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB | |
| 639 | TDES_FLAGS_CFB8); |
| 640 | } |
| 641 | |
| 642 | static int atmel_tdes_cfb8_decrypt(struct ablkcipher_request *req) |
| 643 | { |
| 644 | return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB8); |
| 645 | } |
| 646 | |
| 647 | static int atmel_tdes_cfb16_encrypt(struct ablkcipher_request *req) |
| 648 | { |
| 649 | return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB | |
| 650 | TDES_FLAGS_CFB16); |
| 651 | } |
| 652 | |
| 653 | static int atmel_tdes_cfb16_decrypt(struct ablkcipher_request *req) |
| 654 | { |
| 655 | return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB16); |
| 656 | } |
| 657 | |
| 658 | static int atmel_tdes_cfb32_encrypt(struct ablkcipher_request *req) |
| 659 | { |
| 660 | return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_CFB | |
| 661 | TDES_FLAGS_CFB32); |
| 662 | } |
| 663 | |
| 664 | static int atmel_tdes_cfb32_decrypt(struct ablkcipher_request *req) |
| 665 | { |
| 666 | return atmel_tdes_crypt(req, TDES_FLAGS_CFB | TDES_FLAGS_CFB32); |
| 667 | } |
| 668 | |
| 669 | static int atmel_tdes_ofb_encrypt(struct ablkcipher_request *req) |
| 670 | { |
| 671 | return atmel_tdes_crypt(req, TDES_FLAGS_ENCRYPT | TDES_FLAGS_OFB); |
| 672 | } |
| 673 | |
| 674 | static int atmel_tdes_ofb_decrypt(struct ablkcipher_request *req) |
| 675 | { |
| 676 | return atmel_tdes_crypt(req, TDES_FLAGS_OFB); |
| 677 | } |
| 678 | |
| 679 | static int atmel_tdes_cra_init(struct crypto_tfm *tfm) |
| 680 | { |
| 681 | tfm->crt_ablkcipher.reqsize = sizeof(struct atmel_tdes_reqctx); |
| 682 | |
| 683 | return 0; |
| 684 | } |
| 685 | |
| 686 | static void atmel_tdes_cra_exit(struct crypto_tfm *tfm) |
| 687 | { |
| 688 | } |
| 689 | |
| 690 | static struct crypto_alg tdes_algs[] = { |
| 691 | { |
| 692 | .cra_name = "ecb(des)", |
| 693 | .cra_driver_name = "atmel-ecb-des", |
| 694 | .cra_priority = 100, |
| 695 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 696 | .cra_blocksize = DES_BLOCK_SIZE, |
| 697 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 698 | .cra_alignmask = 0, |
| 699 | .cra_type = &crypto_ablkcipher_type, |
| 700 | .cra_module = THIS_MODULE, |
| 701 | .cra_init = atmel_tdes_cra_init, |
| 702 | .cra_exit = atmel_tdes_cra_exit, |
| 703 | .cra_u.ablkcipher = { |
| 704 | .min_keysize = DES_KEY_SIZE, |
| 705 | .max_keysize = DES_KEY_SIZE, |
| 706 | .setkey = atmel_des_setkey, |
| 707 | .encrypt = atmel_tdes_ecb_encrypt, |
| 708 | .decrypt = atmel_tdes_ecb_decrypt, |
| 709 | } |
| 710 | }, |
| 711 | { |
| 712 | .cra_name = "cbc(des)", |
| 713 | .cra_driver_name = "atmel-cbc-des", |
| 714 | .cra_priority = 100, |
| 715 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 716 | .cra_blocksize = DES_BLOCK_SIZE, |
| 717 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 718 | .cra_alignmask = 0, |
| 719 | .cra_type = &crypto_ablkcipher_type, |
| 720 | .cra_module = THIS_MODULE, |
| 721 | .cra_init = atmel_tdes_cra_init, |
| 722 | .cra_exit = atmel_tdes_cra_exit, |
| 723 | .cra_u.ablkcipher = { |
| 724 | .min_keysize = DES_KEY_SIZE, |
| 725 | .max_keysize = DES_KEY_SIZE, |
| 726 | .ivsize = DES_BLOCK_SIZE, |
| 727 | .setkey = atmel_des_setkey, |
| 728 | .encrypt = atmel_tdes_cbc_encrypt, |
| 729 | .decrypt = atmel_tdes_cbc_decrypt, |
| 730 | } |
| 731 | }, |
| 732 | { |
| 733 | .cra_name = "cfb(des)", |
| 734 | .cra_driver_name = "atmel-cfb-des", |
| 735 | .cra_priority = 100, |
| 736 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 737 | .cra_blocksize = DES_BLOCK_SIZE, |
| 738 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 739 | .cra_alignmask = 0, |
| 740 | .cra_type = &crypto_ablkcipher_type, |
| 741 | .cra_module = THIS_MODULE, |
| 742 | .cra_init = atmel_tdes_cra_init, |
| 743 | .cra_exit = atmel_tdes_cra_exit, |
| 744 | .cra_u.ablkcipher = { |
| 745 | .min_keysize = DES_KEY_SIZE, |
| 746 | .max_keysize = DES_KEY_SIZE, |
| 747 | .ivsize = DES_BLOCK_SIZE, |
| 748 | .setkey = atmel_des_setkey, |
| 749 | .encrypt = atmel_tdes_cfb_encrypt, |
| 750 | .decrypt = atmel_tdes_cfb_decrypt, |
| 751 | } |
| 752 | }, |
| 753 | { |
| 754 | .cra_name = "cfb8(des)", |
| 755 | .cra_driver_name = "atmel-cfb8-des", |
| 756 | .cra_priority = 100, |
| 757 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 758 | .cra_blocksize = CFB8_BLOCK_SIZE, |
| 759 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 760 | .cra_alignmask = 0, |
| 761 | .cra_type = &crypto_ablkcipher_type, |
| 762 | .cra_module = THIS_MODULE, |
| 763 | .cra_init = atmel_tdes_cra_init, |
| 764 | .cra_exit = atmel_tdes_cra_exit, |
| 765 | .cra_u.ablkcipher = { |
| 766 | .min_keysize = DES_KEY_SIZE, |
| 767 | .max_keysize = DES_KEY_SIZE, |
| 768 | .ivsize = DES_BLOCK_SIZE, |
| 769 | .setkey = atmel_des_setkey, |
| 770 | .encrypt = atmel_tdes_cfb8_encrypt, |
| 771 | .decrypt = atmel_tdes_cfb8_decrypt, |
| 772 | } |
| 773 | }, |
| 774 | { |
| 775 | .cra_name = "cfb16(des)", |
| 776 | .cra_driver_name = "atmel-cfb16-des", |
| 777 | .cra_priority = 100, |
| 778 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 779 | .cra_blocksize = CFB16_BLOCK_SIZE, |
| 780 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 781 | .cra_alignmask = 0, |
| 782 | .cra_type = &crypto_ablkcipher_type, |
| 783 | .cra_module = THIS_MODULE, |
| 784 | .cra_init = atmel_tdes_cra_init, |
| 785 | .cra_exit = atmel_tdes_cra_exit, |
| 786 | .cra_u.ablkcipher = { |
| 787 | .min_keysize = DES_KEY_SIZE, |
| 788 | .max_keysize = DES_KEY_SIZE, |
| 789 | .ivsize = DES_BLOCK_SIZE, |
| 790 | .setkey = atmel_des_setkey, |
| 791 | .encrypt = atmel_tdes_cfb16_encrypt, |
| 792 | .decrypt = atmel_tdes_cfb16_decrypt, |
| 793 | } |
| 794 | }, |
| 795 | { |
| 796 | .cra_name = "cfb32(des)", |
| 797 | .cra_driver_name = "atmel-cfb32-des", |
| 798 | .cra_priority = 100, |
| 799 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 800 | .cra_blocksize = CFB32_BLOCK_SIZE, |
| 801 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 802 | .cra_alignmask = 0, |
| 803 | .cra_type = &crypto_ablkcipher_type, |
| 804 | .cra_module = THIS_MODULE, |
| 805 | .cra_init = atmel_tdes_cra_init, |
| 806 | .cra_exit = atmel_tdes_cra_exit, |
| 807 | .cra_u.ablkcipher = { |
| 808 | .min_keysize = DES_KEY_SIZE, |
| 809 | .max_keysize = DES_KEY_SIZE, |
| 810 | .ivsize = DES_BLOCK_SIZE, |
| 811 | .setkey = atmel_des_setkey, |
| 812 | .encrypt = atmel_tdes_cfb32_encrypt, |
| 813 | .decrypt = atmel_tdes_cfb32_decrypt, |
| 814 | } |
| 815 | }, |
| 816 | { |
| 817 | .cra_name = "ofb(des)", |
| 818 | .cra_driver_name = "atmel-ofb-des", |
| 819 | .cra_priority = 100, |
| 820 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 821 | .cra_blocksize = DES_BLOCK_SIZE, |
| 822 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 823 | .cra_alignmask = 0, |
| 824 | .cra_type = &crypto_ablkcipher_type, |
| 825 | .cra_module = THIS_MODULE, |
| 826 | .cra_init = atmel_tdes_cra_init, |
| 827 | .cra_exit = atmel_tdes_cra_exit, |
| 828 | .cra_u.ablkcipher = { |
| 829 | .min_keysize = DES_KEY_SIZE, |
| 830 | .max_keysize = DES_KEY_SIZE, |
| 831 | .ivsize = DES_BLOCK_SIZE, |
| 832 | .setkey = atmel_des_setkey, |
| 833 | .encrypt = atmel_tdes_ofb_encrypt, |
| 834 | .decrypt = atmel_tdes_ofb_decrypt, |
| 835 | } |
| 836 | }, |
| 837 | { |
| 838 | .cra_name = "ecb(des3_ede)", |
| 839 | .cra_driver_name = "atmel-ecb-tdes", |
| 840 | .cra_priority = 100, |
| 841 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 842 | .cra_blocksize = DES_BLOCK_SIZE, |
| 843 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 844 | .cra_alignmask = 0, |
| 845 | .cra_type = &crypto_ablkcipher_type, |
| 846 | .cra_module = THIS_MODULE, |
| 847 | .cra_init = atmel_tdes_cra_init, |
| 848 | .cra_exit = atmel_tdes_cra_exit, |
| 849 | .cra_u.ablkcipher = { |
| 850 | .min_keysize = 2 * DES_KEY_SIZE, |
| 851 | .max_keysize = 3 * DES_KEY_SIZE, |
| 852 | .setkey = atmel_tdes_setkey, |
| 853 | .encrypt = atmel_tdes_ecb_encrypt, |
| 854 | .decrypt = atmel_tdes_ecb_decrypt, |
| 855 | } |
| 856 | }, |
| 857 | { |
| 858 | .cra_name = "cbc(des3_ede)", |
| 859 | .cra_driver_name = "atmel-cbc-tdes", |
| 860 | .cra_priority = 100, |
| 861 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 862 | .cra_blocksize = DES_BLOCK_SIZE, |
| 863 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 864 | .cra_alignmask = 0, |
| 865 | .cra_type = &crypto_ablkcipher_type, |
| 866 | .cra_module = THIS_MODULE, |
| 867 | .cra_init = atmel_tdes_cra_init, |
| 868 | .cra_exit = atmel_tdes_cra_exit, |
| 869 | .cra_u.ablkcipher = { |
| 870 | .min_keysize = 2*DES_KEY_SIZE, |
| 871 | .max_keysize = 3*DES_KEY_SIZE, |
| 872 | .ivsize = DES_BLOCK_SIZE, |
| 873 | .setkey = atmel_tdes_setkey, |
| 874 | .encrypt = atmel_tdes_cbc_encrypt, |
| 875 | .decrypt = atmel_tdes_cbc_decrypt, |
| 876 | } |
| 877 | }, |
| 878 | { |
| 879 | .cra_name = "cfb(des3_ede)", |
| 880 | .cra_driver_name = "atmel-cfb-tdes", |
| 881 | .cra_priority = 100, |
| 882 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 883 | .cra_blocksize = DES_BLOCK_SIZE, |
| 884 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 885 | .cra_alignmask = 0, |
| 886 | .cra_type = &crypto_ablkcipher_type, |
| 887 | .cra_module = THIS_MODULE, |
| 888 | .cra_init = atmel_tdes_cra_init, |
| 889 | .cra_exit = atmel_tdes_cra_exit, |
| 890 | .cra_u.ablkcipher = { |
| 891 | .min_keysize = 2*DES_KEY_SIZE, |
| 892 | .max_keysize = 2*DES_KEY_SIZE, |
| 893 | .ivsize = DES_BLOCK_SIZE, |
| 894 | .setkey = atmel_tdes_setkey, |
| 895 | .encrypt = atmel_tdes_cfb_encrypt, |
| 896 | .decrypt = atmel_tdes_cfb_decrypt, |
| 897 | } |
| 898 | }, |
| 899 | { |
| 900 | .cra_name = "cfb8(des3_ede)", |
| 901 | .cra_driver_name = "atmel-cfb8-tdes", |
| 902 | .cra_priority = 100, |
| 903 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 904 | .cra_blocksize = CFB8_BLOCK_SIZE, |
| 905 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 906 | .cra_alignmask = 0, |
| 907 | .cra_type = &crypto_ablkcipher_type, |
| 908 | .cra_module = THIS_MODULE, |
| 909 | .cra_init = atmel_tdes_cra_init, |
| 910 | .cra_exit = atmel_tdes_cra_exit, |
| 911 | .cra_u.ablkcipher = { |
| 912 | .min_keysize = 2*DES_KEY_SIZE, |
| 913 | .max_keysize = 2*DES_KEY_SIZE, |
| 914 | .ivsize = DES_BLOCK_SIZE, |
| 915 | .setkey = atmel_tdes_setkey, |
| 916 | .encrypt = atmel_tdes_cfb8_encrypt, |
| 917 | .decrypt = atmel_tdes_cfb8_decrypt, |
| 918 | } |
| 919 | }, |
| 920 | { |
| 921 | .cra_name = "cfb16(des3_ede)", |
| 922 | .cra_driver_name = "atmel-cfb16-tdes", |
| 923 | .cra_priority = 100, |
| 924 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 925 | .cra_blocksize = CFB16_BLOCK_SIZE, |
| 926 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 927 | .cra_alignmask = 0, |
| 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 = 2*DES_KEY_SIZE, |
| 934 | .max_keysize = 2*DES_KEY_SIZE, |
| 935 | .ivsize = DES_BLOCK_SIZE, |
| 936 | .setkey = atmel_tdes_setkey, |
| 937 | .encrypt = atmel_tdes_cfb16_encrypt, |
| 938 | .decrypt = atmel_tdes_cfb16_decrypt, |
| 939 | } |
| 940 | }, |
| 941 | { |
| 942 | .cra_name = "cfb32(des3_ede)", |
| 943 | .cra_driver_name = "atmel-cfb32-tdes", |
| 944 | .cra_priority = 100, |
| 945 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 946 | .cra_blocksize = CFB32_BLOCK_SIZE, |
| 947 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 948 | .cra_alignmask = 0, |
| 949 | .cra_type = &crypto_ablkcipher_type, |
| 950 | .cra_module = THIS_MODULE, |
| 951 | .cra_init = atmel_tdes_cra_init, |
| 952 | .cra_exit = atmel_tdes_cra_exit, |
| 953 | .cra_u.ablkcipher = { |
| 954 | .min_keysize = 2*DES_KEY_SIZE, |
| 955 | .max_keysize = 2*DES_KEY_SIZE, |
| 956 | .ivsize = DES_BLOCK_SIZE, |
| 957 | .setkey = atmel_tdes_setkey, |
| 958 | .encrypt = atmel_tdes_cfb32_encrypt, |
| 959 | .decrypt = atmel_tdes_cfb32_decrypt, |
| 960 | } |
| 961 | }, |
| 962 | { |
| 963 | .cra_name = "ofb(des3_ede)", |
| 964 | .cra_driver_name = "atmel-ofb-tdes", |
| 965 | .cra_priority = 100, |
| 966 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, |
| 967 | .cra_blocksize = DES_BLOCK_SIZE, |
| 968 | .cra_ctxsize = sizeof(struct atmel_tdes_ctx), |
| 969 | .cra_alignmask = 0, |
| 970 | .cra_type = &crypto_ablkcipher_type, |
| 971 | .cra_module = THIS_MODULE, |
| 972 | .cra_init = atmel_tdes_cra_init, |
| 973 | .cra_exit = atmel_tdes_cra_exit, |
| 974 | .cra_u.ablkcipher = { |
| 975 | .min_keysize = 2*DES_KEY_SIZE, |
| 976 | .max_keysize = 3*DES_KEY_SIZE, |
| 977 | .ivsize = DES_BLOCK_SIZE, |
| 978 | .setkey = atmel_tdes_setkey, |
| 979 | .encrypt = atmel_tdes_ofb_encrypt, |
| 980 | .decrypt = atmel_tdes_ofb_decrypt, |
| 981 | } |
| 982 | }, |
| 983 | }; |
| 984 | |
| 985 | static void atmel_tdes_queue_task(unsigned long data) |
| 986 | { |
| 987 | struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *)data; |
| 988 | |
| 989 | atmel_tdes_handle_queue(dd, NULL); |
| 990 | } |
| 991 | |
| 992 | static void atmel_tdes_done_task(unsigned long data) |
| 993 | { |
| 994 | struct atmel_tdes_dev *dd = (struct atmel_tdes_dev *) data; |
| 995 | int err; |
| 996 | |
| 997 | err = atmel_tdes_crypt_dma_stop(dd); |
| 998 | |
| 999 | err = dd->err ? : err; |
| 1000 | |
| 1001 | if (dd->total && !err) { |
| 1002 | err = atmel_tdes_crypt_dma_start(dd); |
| 1003 | if (!err) |
| 1004 | return; |
| 1005 | } |
| 1006 | |
| 1007 | atmel_tdes_finish_req(dd, err); |
| 1008 | atmel_tdes_handle_queue(dd, NULL); |
| 1009 | } |
| 1010 | |
| 1011 | static irqreturn_t atmel_tdes_irq(int irq, void *dev_id) |
| 1012 | { |
| 1013 | struct atmel_tdes_dev *tdes_dd = dev_id; |
| 1014 | u32 reg; |
| 1015 | |
| 1016 | reg = atmel_tdes_read(tdes_dd, TDES_ISR); |
| 1017 | if (reg & atmel_tdes_read(tdes_dd, TDES_IMR)) { |
| 1018 | atmel_tdes_write(tdes_dd, TDES_IDR, reg); |
| 1019 | if (TDES_FLAGS_BUSY & tdes_dd->flags) |
| 1020 | tasklet_schedule(&tdes_dd->done_task); |
| 1021 | else |
| 1022 | dev_warn(tdes_dd->dev, "TDES interrupt when no active requests.\n"); |
| 1023 | return IRQ_HANDLED; |
| 1024 | } |
| 1025 | |
| 1026 | return IRQ_NONE; |
| 1027 | } |
| 1028 | |
| 1029 | static void atmel_tdes_unregister_algs(struct atmel_tdes_dev *dd) |
| 1030 | { |
| 1031 | int i; |
| 1032 | |
| 1033 | for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) |
| 1034 | crypto_unregister_alg(&tdes_algs[i]); |
| 1035 | } |
| 1036 | |
| 1037 | static int atmel_tdes_register_algs(struct atmel_tdes_dev *dd) |
| 1038 | { |
| 1039 | int err, i, j; |
| 1040 | |
| 1041 | for (i = 0; i < ARRAY_SIZE(tdes_algs); i++) { |
Nicolas Royer | 1380200 | 2012-07-01 19:19:45 +0200 | [diff] [blame] | 1042 | err = crypto_register_alg(&tdes_algs[i]); |
| 1043 | if (err) |
| 1044 | goto err_tdes_algs; |
| 1045 | } |
| 1046 | |
| 1047 | return 0; |
| 1048 | |
| 1049 | err_tdes_algs: |
| 1050 | for (j = 0; j < i; j++) |
| 1051 | crypto_unregister_alg(&tdes_algs[j]); |
| 1052 | |
| 1053 | return err; |
| 1054 | } |
| 1055 | |
Greg Kroah-Hartman | 49cfe4d | 2012-12-21 13:14:09 -0800 | [diff] [blame] | 1056 | static int atmel_tdes_probe(struct platform_device *pdev) |
Nicolas Royer | 1380200 | 2012-07-01 19:19:45 +0200 | [diff] [blame] | 1057 | { |
| 1058 | struct atmel_tdes_dev *tdes_dd; |
| 1059 | struct device *dev = &pdev->dev; |
| 1060 | struct resource *tdes_res; |
| 1061 | unsigned long tdes_phys_size; |
| 1062 | int err; |
| 1063 | |
| 1064 | tdes_dd = kzalloc(sizeof(struct atmel_tdes_dev), GFP_KERNEL); |
| 1065 | if (tdes_dd == NULL) { |
| 1066 | dev_err(dev, "unable to alloc data struct.\n"); |
| 1067 | err = -ENOMEM; |
| 1068 | goto tdes_dd_err; |
| 1069 | } |
| 1070 | |
| 1071 | tdes_dd->dev = dev; |
| 1072 | |
| 1073 | platform_set_drvdata(pdev, tdes_dd); |
| 1074 | |
| 1075 | INIT_LIST_HEAD(&tdes_dd->list); |
| 1076 | |
| 1077 | tasklet_init(&tdes_dd->done_task, atmel_tdes_done_task, |
| 1078 | (unsigned long)tdes_dd); |
| 1079 | tasklet_init(&tdes_dd->queue_task, atmel_tdes_queue_task, |
| 1080 | (unsigned long)tdes_dd); |
| 1081 | |
| 1082 | crypto_init_queue(&tdes_dd->queue, ATMEL_TDES_QUEUE_LENGTH); |
| 1083 | |
| 1084 | tdes_dd->irq = -1; |
| 1085 | |
| 1086 | /* Get the base address */ |
| 1087 | tdes_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| 1088 | if (!tdes_res) { |
| 1089 | dev_err(dev, "no MEM resource info\n"); |
| 1090 | err = -ENODEV; |
| 1091 | goto res_err; |
| 1092 | } |
| 1093 | tdes_dd->phys_base = tdes_res->start; |
| 1094 | tdes_phys_size = resource_size(tdes_res); |
| 1095 | |
| 1096 | /* Get the IRQ */ |
| 1097 | tdes_dd->irq = platform_get_irq(pdev, 0); |
| 1098 | if (tdes_dd->irq < 0) { |
| 1099 | dev_err(dev, "no IRQ resource info\n"); |
| 1100 | err = tdes_dd->irq; |
| 1101 | goto res_err; |
| 1102 | } |
| 1103 | |
| 1104 | err = request_irq(tdes_dd->irq, atmel_tdes_irq, IRQF_SHARED, |
| 1105 | "atmel-tdes", tdes_dd); |
| 1106 | if (err) { |
| 1107 | dev_err(dev, "unable to request tdes irq.\n"); |
| 1108 | goto tdes_irq_err; |
| 1109 | } |
| 1110 | |
| 1111 | /* Initializing the clock */ |
| 1112 | tdes_dd->iclk = clk_get(&pdev->dev, NULL); |
| 1113 | if (IS_ERR(tdes_dd->iclk)) { |
| 1114 | dev_err(dev, "clock intialization failed.\n"); |
| 1115 | err = PTR_ERR(tdes_dd->iclk); |
| 1116 | goto clk_err; |
| 1117 | } |
| 1118 | |
| 1119 | tdes_dd->io_base = ioremap(tdes_dd->phys_base, tdes_phys_size); |
| 1120 | if (!tdes_dd->io_base) { |
| 1121 | dev_err(dev, "can't ioremap\n"); |
| 1122 | err = -ENOMEM; |
| 1123 | goto tdes_io_err; |
| 1124 | } |
| 1125 | |
| 1126 | err = atmel_tdes_dma_init(tdes_dd); |
| 1127 | if (err) |
| 1128 | goto err_tdes_dma; |
| 1129 | |
| 1130 | spin_lock(&atmel_tdes.lock); |
| 1131 | list_add_tail(&tdes_dd->list, &atmel_tdes.dev_list); |
| 1132 | spin_unlock(&atmel_tdes.lock); |
| 1133 | |
| 1134 | err = atmel_tdes_register_algs(tdes_dd); |
| 1135 | if (err) |
| 1136 | goto err_algs; |
| 1137 | |
| 1138 | dev_info(dev, "Atmel DES/TDES\n"); |
| 1139 | |
| 1140 | return 0; |
| 1141 | |
| 1142 | err_algs: |
| 1143 | spin_lock(&atmel_tdes.lock); |
| 1144 | list_del(&tdes_dd->list); |
| 1145 | spin_unlock(&atmel_tdes.lock); |
| 1146 | atmel_tdes_dma_cleanup(tdes_dd); |
| 1147 | err_tdes_dma: |
| 1148 | iounmap(tdes_dd->io_base); |
| 1149 | tdes_io_err: |
| 1150 | clk_put(tdes_dd->iclk); |
| 1151 | clk_err: |
| 1152 | free_irq(tdes_dd->irq, tdes_dd); |
| 1153 | tdes_irq_err: |
| 1154 | res_err: |
| 1155 | tasklet_kill(&tdes_dd->done_task); |
| 1156 | tasklet_kill(&tdes_dd->queue_task); |
| 1157 | kfree(tdes_dd); |
| 1158 | tdes_dd = NULL; |
| 1159 | tdes_dd_err: |
| 1160 | dev_err(dev, "initialization failed.\n"); |
| 1161 | |
| 1162 | return err; |
| 1163 | } |
| 1164 | |
Greg Kroah-Hartman | 49cfe4d | 2012-12-21 13:14:09 -0800 | [diff] [blame] | 1165 | static int atmel_tdes_remove(struct platform_device *pdev) |
Nicolas Royer | 1380200 | 2012-07-01 19:19:45 +0200 | [diff] [blame] | 1166 | { |
| 1167 | static struct atmel_tdes_dev *tdes_dd; |
| 1168 | |
| 1169 | tdes_dd = platform_get_drvdata(pdev); |
| 1170 | if (!tdes_dd) |
| 1171 | return -ENODEV; |
| 1172 | spin_lock(&atmel_tdes.lock); |
| 1173 | list_del(&tdes_dd->list); |
| 1174 | spin_unlock(&atmel_tdes.lock); |
| 1175 | |
| 1176 | atmel_tdes_unregister_algs(tdes_dd); |
| 1177 | |
| 1178 | tasklet_kill(&tdes_dd->done_task); |
| 1179 | tasklet_kill(&tdes_dd->queue_task); |
| 1180 | |
| 1181 | atmel_tdes_dma_cleanup(tdes_dd); |
| 1182 | |
| 1183 | iounmap(tdes_dd->io_base); |
| 1184 | |
| 1185 | clk_put(tdes_dd->iclk); |
| 1186 | |
| 1187 | if (tdes_dd->irq >= 0) |
| 1188 | free_irq(tdes_dd->irq, tdes_dd); |
| 1189 | |
| 1190 | kfree(tdes_dd); |
| 1191 | tdes_dd = NULL; |
| 1192 | |
| 1193 | return 0; |
| 1194 | } |
| 1195 | |
| 1196 | static struct platform_driver atmel_tdes_driver = { |
| 1197 | .probe = atmel_tdes_probe, |
Greg Kroah-Hartman | 49cfe4d | 2012-12-21 13:14:09 -0800 | [diff] [blame] | 1198 | .remove = atmel_tdes_remove, |
Nicolas Royer | 1380200 | 2012-07-01 19:19:45 +0200 | [diff] [blame] | 1199 | .driver = { |
| 1200 | .name = "atmel_tdes", |
| 1201 | .owner = THIS_MODULE, |
| 1202 | }, |
| 1203 | }; |
| 1204 | |
| 1205 | module_platform_driver(atmel_tdes_driver); |
| 1206 | |
| 1207 | MODULE_DESCRIPTION("Atmel DES/TDES hw acceleration support."); |
| 1208 | MODULE_LICENSE("GPL v2"); |
| 1209 | MODULE_AUTHOR("Nicolas Royer - Eukréa Electromatique"); |