4 * Support for Samsung S5PV210 HW acceleration.
6 * Copyright (C) 2011 NetUP Inc. All rights reserved.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as published
10 * by the Free Software Foundation.
14 #include <linux/delay.h>
15 #include <linux/err.h>
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/errno.h>
19 #include <linux/kernel.h>
20 #include <linux/clk.h>
21 #include <linux/platform_device.h>
22 #include <linux/scatterlist.h>
23 #include <linux/dma-mapping.h>
25 #include <linux/crypto.h>
26 #include <linux/interrupt.h>
28 #include <crypto/algapi.h>
29 #include <crypto/aes.h>
30 #include <crypto/ctr.h>
35 #define _SBF(s, v) ((v) << (s))
36 #define _BIT(b) _SBF(b, 1)
38 /* Feed control registers */
39 #define SSS_REG_FCINTSTAT 0x0000
40 #define SSS_FCINTSTAT_BRDMAINT _BIT(3)
41 #define SSS_FCINTSTAT_BTDMAINT _BIT(2)
42 #define SSS_FCINTSTAT_HRDMAINT _BIT(1)
43 #define SSS_FCINTSTAT_PKDMAINT _BIT(0)
45 #define SSS_REG_FCINTENSET 0x0004
46 #define SSS_FCINTENSET_BRDMAINTENSET _BIT(3)
47 #define SSS_FCINTENSET_BTDMAINTENSET _BIT(2)
48 #define SSS_FCINTENSET_HRDMAINTENSET _BIT(1)
49 #define SSS_FCINTENSET_PKDMAINTENSET _BIT(0)
51 #define SSS_REG_FCINTENCLR 0x0008
52 #define SSS_FCINTENCLR_BRDMAINTENCLR _BIT(3)
53 #define SSS_FCINTENCLR_BTDMAINTENCLR _BIT(2)
54 #define SSS_FCINTENCLR_HRDMAINTENCLR _BIT(1)
55 #define SSS_FCINTENCLR_PKDMAINTENCLR _BIT(0)
57 #define SSS_REG_FCINTPEND 0x000C
58 #define SSS_FCINTPEND_BRDMAINTP _BIT(3)
59 #define SSS_FCINTPEND_BTDMAINTP _BIT(2)
60 #define SSS_FCINTPEND_HRDMAINTP _BIT(1)
61 #define SSS_FCINTPEND_PKDMAINTP _BIT(0)
63 #define SSS_REG_FCFIFOSTAT 0x0010
64 #define SSS_FCFIFOSTAT_BRFIFOFUL _BIT(7)
65 #define SSS_FCFIFOSTAT_BRFIFOEMP _BIT(6)
66 #define SSS_FCFIFOSTAT_BTFIFOFUL _BIT(5)
67 #define SSS_FCFIFOSTAT_BTFIFOEMP _BIT(4)
68 #define SSS_FCFIFOSTAT_HRFIFOFUL _BIT(3)
69 #define SSS_FCFIFOSTAT_HRFIFOEMP _BIT(2)
70 #define SSS_FCFIFOSTAT_PKFIFOFUL _BIT(1)
71 #define SSS_FCFIFOSTAT_PKFIFOEMP _BIT(0)
73 #define SSS_REG_FCFIFOCTRL 0x0014
74 #define SSS_FCFIFOCTRL_DESSEL _BIT(2)
75 #define SSS_HASHIN_INDEPENDENT _SBF(0, 0x00)
76 #define SSS_HASHIN_CIPHER_INPUT _SBF(0, 0x01)
77 #define SSS_HASHIN_CIPHER_OUTPUT _SBF(0, 0x02)
79 #define SSS_REG_FCBRDMAS 0x0020
80 #define SSS_REG_FCBRDMAL 0x0024
81 #define SSS_REG_FCBRDMAC 0x0028
82 #define SSS_FCBRDMAC_BYTESWAP _BIT(1)
83 #define SSS_FCBRDMAC_FLUSH _BIT(0)
85 #define SSS_REG_FCBTDMAS 0x0030
86 #define SSS_REG_FCBTDMAL 0x0034
87 #define SSS_REG_FCBTDMAC 0x0038
88 #define SSS_FCBTDMAC_BYTESWAP _BIT(1)
89 #define SSS_FCBTDMAC_FLUSH _BIT(0)
91 #define SSS_REG_FCHRDMAS 0x0040
92 #define SSS_REG_FCHRDMAL 0x0044
93 #define SSS_REG_FCHRDMAC 0x0048
94 #define SSS_FCHRDMAC_BYTESWAP _BIT(1)
95 #define SSS_FCHRDMAC_FLUSH _BIT(0)
97 #define SSS_REG_FCPKDMAS 0x0050
98 #define SSS_REG_FCPKDMAL 0x0054
99 #define SSS_REG_FCPKDMAC 0x0058
100 #define SSS_FCPKDMAC_BYTESWAP _BIT(3)
101 #define SSS_FCPKDMAC_DESCEND _BIT(2)
102 #define SSS_FCPKDMAC_TRANSMIT _BIT(1)
103 #define SSS_FCPKDMAC_FLUSH _BIT(0)
105 #define SSS_REG_FCPKDMAO 0x005C
108 #define SSS_REG_AES_CONTROL 0x4000
109 #define SSS_AES_BYTESWAP_DI _BIT(11)
110 #define SSS_AES_BYTESWAP_DO _BIT(10)
111 #define SSS_AES_BYTESWAP_IV _BIT(9)
112 #define SSS_AES_BYTESWAP_CNT _BIT(8)
113 #define SSS_AES_BYTESWAP_KEY _BIT(7)
114 #define SSS_AES_KEY_CHANGE_MODE _BIT(6)
115 #define SSS_AES_KEY_SIZE_128 _SBF(4, 0x00)
116 #define SSS_AES_KEY_SIZE_192 _SBF(4, 0x01)
117 #define SSS_AES_KEY_SIZE_256 _SBF(4, 0x02)
118 #define SSS_AES_FIFO_MODE _BIT(3)
119 #define SSS_AES_CHAIN_MODE_ECB _SBF(1, 0x00)
120 #define SSS_AES_CHAIN_MODE_CBC _SBF(1, 0x01)
121 #define SSS_AES_CHAIN_MODE_CTR _SBF(1, 0x02)
122 #define SSS_AES_MODE_DECRYPT _BIT(0)
124 #define SSS_REG_AES_STATUS 0x4004
125 #define SSS_AES_BUSY _BIT(2)
126 #define SSS_AES_INPUT_READY _BIT(1)
127 #define SSS_AES_OUTPUT_READY _BIT(0)
129 #define SSS_REG_AES_IN_DATA(s) (0x4010 + (s << 2))
130 #define SSS_REG_AES_OUT_DATA(s) (0x4020 + (s << 2))
131 #define SSS_REG_AES_IV_DATA(s) (0x4030 + (s << 2))
132 #define SSS_REG_AES_CNT_DATA(s) (0x4040 + (s << 2))
133 #define SSS_REG_AES_KEY_DATA(s) (0x4080 + (s << 2))
135 #define SSS_REG(dev, reg) ((dev)->ioaddr + (SSS_REG_##reg))
136 #define SSS_READ(dev, reg) __raw_readl(SSS_REG(dev, reg))
137 #define SSS_WRITE(dev, reg, val) __raw_writel((val), SSS_REG(dev, reg))
139 /* HW engine modes */
140 #define FLAGS_AES_DECRYPT _BIT(0)
141 #define FLAGS_AES_MODE_MASK _SBF(1, 0x03)
142 #define FLAGS_AES_CBC _SBF(1, 0x01)
143 #define FLAGS_AES_CTR _SBF(1, 0x02)
145 #define AES_KEY_LEN 16
146 #define CRYPTO_QUEUE_LEN 1
148 struct s5p_aes_reqctx {
153 struct s5p_aes_dev *dev;
155 uint8_t aes_key[AES_MAX_KEY_SIZE];
156 uint8_t nonce[CTR_RFC3686_NONCE_SIZE];
163 void __iomem *ioaddr;
167 struct ablkcipher_request *req;
168 struct s5p_aes_ctx *ctx;
169 struct scatterlist *sg_src;
170 struct scatterlist *sg_dst;
172 struct tasklet_struct tasklet;
173 struct crypto_queue queue;
178 static struct s5p_aes_dev *s5p_dev;
180 static void s5p_set_dma_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
182 SSS_WRITE(dev, FCBRDMAS, sg_dma_address(sg));
183 SSS_WRITE(dev, FCBRDMAL, sg_dma_len(sg));
186 static void s5p_set_dma_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
188 SSS_WRITE(dev, FCBTDMAS, sg_dma_address(sg));
189 SSS_WRITE(dev, FCBTDMAL, sg_dma_len(sg));
192 static void s5p_aes_complete(struct s5p_aes_dev *dev, int err)
194 /* holding a lock outside */
195 dev->req->base.complete(&dev->req->base, err);
199 static void s5p_unset_outdata(struct s5p_aes_dev *dev)
201 dma_unmap_sg(dev->dev, dev->sg_dst, 1, DMA_FROM_DEVICE);
204 static void s5p_unset_indata(struct s5p_aes_dev *dev)
206 dma_unmap_sg(dev->dev, dev->sg_src, 1, DMA_TO_DEVICE);
209 static int s5p_set_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
213 if (!IS_ALIGNED(sg_dma_len(sg), AES_BLOCK_SIZE)) {
217 if (!sg_dma_len(sg)) {
222 err = dma_map_sg(dev->dev, sg, 1, DMA_FROM_DEVICE);
235 static int s5p_set_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
239 if (!IS_ALIGNED(sg_dma_len(sg), AES_BLOCK_SIZE)) {
243 if (!sg_dma_len(sg)) {
248 err = dma_map_sg(dev->dev, sg, 1, DMA_TO_DEVICE);
261 static void s5p_aes_tx(struct s5p_aes_dev *dev)
265 s5p_unset_outdata(dev);
267 if (!sg_is_last(dev->sg_dst)) {
268 err = s5p_set_outdata(dev, sg_next(dev->sg_dst));
270 s5p_aes_complete(dev, err);
274 s5p_set_dma_outdata(dev, dev->sg_dst);
276 s5p_aes_complete(dev, err);
279 static void s5p_aes_rx(struct s5p_aes_dev *dev)
283 s5p_unset_indata(dev);
285 if (!sg_is_last(dev->sg_src)) {
286 err = s5p_set_indata(dev, sg_next(dev->sg_src));
288 s5p_aes_complete(dev, err);
292 s5p_set_dma_indata(dev, dev->sg_src);
296 static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
298 struct platform_device *pdev = dev_id;
299 struct s5p_aes_dev *dev = platform_get_drvdata(pdev);
303 spin_lock_irqsave(&dev->lock, flags);
305 if (irq == dev->irq_fc) {
306 status = SSS_READ(dev, FCINTSTAT);
307 if (status & SSS_FCINTSTAT_BRDMAINT)
309 if (status & SSS_FCINTSTAT_BTDMAINT)
312 SSS_WRITE(dev, FCINTPEND, status);
315 spin_unlock_irqrestore(&dev->lock, flags);
320 static void s5p_set_aes(struct s5p_aes_dev *dev,
321 uint8_t *key, uint8_t *iv, unsigned int keylen)
323 void __iomem *keystart;
325 memcpy(dev->ioaddr + SSS_REG_AES_IV_DATA(0), iv, 0x10);
327 if (keylen == AES_KEYSIZE_256)
328 keystart = dev->ioaddr + SSS_REG_AES_KEY_DATA(0);
329 else if (keylen == AES_KEYSIZE_192)
330 keystart = dev->ioaddr + SSS_REG_AES_KEY_DATA(2);
332 keystart = dev->ioaddr + SSS_REG_AES_KEY_DATA(4);
334 memcpy(keystart, key, keylen);
337 static void s5p_aes_crypt_start(struct s5p_aes_dev *dev, unsigned long mode)
339 struct ablkcipher_request *req = dev->req;
341 uint32_t aes_control;
345 aes_control = SSS_AES_KEY_CHANGE_MODE;
346 if (mode & FLAGS_AES_DECRYPT)
347 aes_control |= SSS_AES_MODE_DECRYPT;
349 if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CBC)
350 aes_control |= SSS_AES_CHAIN_MODE_CBC;
351 else if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CTR)
352 aes_control |= SSS_AES_CHAIN_MODE_CTR;
354 if (dev->ctx->keylen == AES_KEYSIZE_192)
355 aes_control |= SSS_AES_KEY_SIZE_192;
356 else if (dev->ctx->keylen == AES_KEYSIZE_256)
357 aes_control |= SSS_AES_KEY_SIZE_256;
359 aes_control |= SSS_AES_FIFO_MODE;
361 /* as a variant it is possible to use byte swapping on DMA side */
362 aes_control |= SSS_AES_BYTESWAP_DI
363 | SSS_AES_BYTESWAP_DO
364 | SSS_AES_BYTESWAP_IV
365 | SSS_AES_BYTESWAP_KEY
366 | SSS_AES_BYTESWAP_CNT;
368 spin_lock_irqsave(&dev->lock, flags);
370 SSS_WRITE(dev, FCINTENCLR,
371 SSS_FCINTENCLR_BTDMAINTENCLR | SSS_FCINTENCLR_BRDMAINTENCLR);
372 SSS_WRITE(dev, FCFIFOCTRL, 0x00);
374 err = s5p_set_indata(dev, req->src);
378 err = s5p_set_outdata(dev, req->dst);
382 SSS_WRITE(dev, AES_CONTROL, aes_control);
383 s5p_set_aes(dev, dev->ctx->aes_key, req->info, dev->ctx->keylen);
385 s5p_set_dma_indata(dev, req->src);
386 s5p_set_dma_outdata(dev, req->dst);
388 SSS_WRITE(dev, FCINTENSET,
389 SSS_FCINTENSET_BTDMAINTENSET | SSS_FCINTENSET_BRDMAINTENSET);
391 spin_unlock_irqrestore(&dev->lock, flags);
396 s5p_unset_indata(dev);
399 s5p_aes_complete(dev, err);
400 spin_unlock_irqrestore(&dev->lock, flags);
403 static void s5p_tasklet_cb(unsigned long data)
405 struct s5p_aes_dev *dev = (struct s5p_aes_dev *)data;
406 struct crypto_async_request *async_req, *backlog;
407 struct s5p_aes_reqctx *reqctx;
410 spin_lock_irqsave(&dev->lock, flags);
411 backlog = crypto_get_backlog(&dev->queue);
412 async_req = crypto_dequeue_request(&dev->queue);
413 spin_unlock_irqrestore(&dev->lock, flags);
419 backlog->complete(backlog, -EINPROGRESS);
421 dev->req = ablkcipher_request_cast(async_req);
422 dev->ctx = crypto_tfm_ctx(dev->req->base.tfm);
423 reqctx = ablkcipher_request_ctx(dev->req);
425 s5p_aes_crypt_start(dev, reqctx->mode);
428 static int s5p_aes_handle_req(struct s5p_aes_dev *dev,
429 struct ablkcipher_request *req)
434 spin_lock_irqsave(&dev->lock, flags);
437 spin_unlock_irqrestore(&dev->lock, flags);
442 err = ablkcipher_enqueue_request(&dev->queue, req);
443 spin_unlock_irqrestore(&dev->lock, flags);
445 tasklet_schedule(&dev->tasklet);
451 static int s5p_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
453 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
454 struct s5p_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
455 struct s5p_aes_reqctx *reqctx = ablkcipher_request_ctx(req);
456 struct s5p_aes_dev *dev = ctx->dev;
458 if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
459 pr_err("request size is not exact amount of AES blocks\n");
465 return s5p_aes_handle_req(dev, req);
468 static int s5p_aes_setkey(struct crypto_ablkcipher *cipher,
469 const uint8_t *key, unsigned int keylen)
471 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
472 struct s5p_aes_ctx *ctx = crypto_tfm_ctx(tfm);
474 if (keylen != AES_KEYSIZE_128 &&
475 keylen != AES_KEYSIZE_192 &&
476 keylen != AES_KEYSIZE_256)
479 memcpy(ctx->aes_key, key, keylen);
480 ctx->keylen = keylen;
485 static int s5p_aes_ecb_encrypt(struct ablkcipher_request *req)
487 return s5p_aes_crypt(req, 0);
490 static int s5p_aes_ecb_decrypt(struct ablkcipher_request *req)
492 return s5p_aes_crypt(req, FLAGS_AES_DECRYPT);
495 static int s5p_aes_cbc_encrypt(struct ablkcipher_request *req)
497 return s5p_aes_crypt(req, FLAGS_AES_CBC);
500 static int s5p_aes_cbc_decrypt(struct ablkcipher_request *req)
502 return s5p_aes_crypt(req, FLAGS_AES_DECRYPT | FLAGS_AES_CBC);
505 static int s5p_aes_cra_init(struct crypto_tfm *tfm)
507 struct s5p_aes_ctx *ctx = crypto_tfm_ctx(tfm);
510 tfm->crt_ablkcipher.reqsize = sizeof(struct s5p_aes_reqctx);
515 static struct crypto_alg algs[] = {
517 .cra_name = "ecb(aes)",
518 .cra_driver_name = "ecb-aes-s5p",
520 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
522 CRYPTO_ALG_KERN_DRIVER_ONLY,
523 .cra_blocksize = AES_BLOCK_SIZE,
524 .cra_ctxsize = sizeof(struct s5p_aes_ctx),
525 .cra_alignmask = 0x0f,
526 .cra_type = &crypto_ablkcipher_type,
527 .cra_module = THIS_MODULE,
528 .cra_init = s5p_aes_cra_init,
529 .cra_u.ablkcipher = {
530 .min_keysize = AES_MIN_KEY_SIZE,
531 .max_keysize = AES_MAX_KEY_SIZE,
532 .setkey = s5p_aes_setkey,
533 .encrypt = s5p_aes_ecb_encrypt,
534 .decrypt = s5p_aes_ecb_decrypt,
538 .cra_name = "cbc(aes)",
539 .cra_driver_name = "cbc-aes-s5p",
541 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
543 CRYPTO_ALG_KERN_DRIVER_ONLY,
544 .cra_blocksize = AES_BLOCK_SIZE,
545 .cra_ctxsize = sizeof(struct s5p_aes_ctx),
546 .cra_alignmask = 0x0f,
547 .cra_type = &crypto_ablkcipher_type,
548 .cra_module = THIS_MODULE,
549 .cra_init = s5p_aes_cra_init,
550 .cra_u.ablkcipher = {
551 .min_keysize = AES_MIN_KEY_SIZE,
552 .max_keysize = AES_MAX_KEY_SIZE,
553 .ivsize = AES_BLOCK_SIZE,
554 .setkey = s5p_aes_setkey,
555 .encrypt = s5p_aes_cbc_encrypt,
556 .decrypt = s5p_aes_cbc_decrypt,
561 static int s5p_aes_probe(struct platform_device *pdev)
563 int i, j, err = -ENODEV;
564 struct s5p_aes_dev *pdata;
565 struct device *dev = &pdev->dev;
566 struct resource *res;
571 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
575 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
579 if (!devm_request_mem_region(dev, res->start,
580 resource_size(res), pdev->name))
583 pdata->clk = clk_get(dev, "secss");
584 if (IS_ERR(pdata->clk)) {
585 dev_err(dev, "failed to find secss clock source\n");
589 clk_enable(pdata->clk);
591 spin_lock_init(&pdata->lock);
592 pdata->ioaddr = devm_ioremap(dev, res->start,
595 pdata->irq_hash = platform_get_irq_byname(pdev, "hash");
596 if (pdata->irq_hash < 0) {
597 err = pdata->irq_hash;
598 dev_warn(dev, "hash interrupt is not available.\n");
601 err = devm_request_irq(dev, pdata->irq_hash, s5p_aes_interrupt,
602 IRQF_SHARED, pdev->name, pdev);
604 dev_warn(dev, "hash interrupt is not available.\n");
608 pdata->irq_fc = platform_get_irq_byname(pdev, "feed control");
609 if (pdata->irq_fc < 0) {
611 dev_warn(dev, "feed control interrupt is not available.\n");
614 err = devm_request_irq(dev, pdata->irq_fc, s5p_aes_interrupt,
615 IRQF_SHARED, pdev->name, pdev);
617 dev_warn(dev, "feed control interrupt is not available.\n");
622 platform_set_drvdata(pdev, pdata);
625 tasklet_init(&pdata->tasklet, s5p_tasklet_cb, (unsigned long)pdata);
626 crypto_init_queue(&pdata->queue, CRYPTO_QUEUE_LEN);
628 for (i = 0; i < ARRAY_SIZE(algs); i++) {
629 INIT_LIST_HEAD(&algs[i].cra_list);
630 err = crypto_register_alg(&algs[i]);
635 pr_info("s5p-sss driver registered\n");
640 dev_err(dev, "can't register '%s': %d\n", algs[i].cra_name, err);
642 for (j = 0; j < i; j++)
643 crypto_unregister_alg(&algs[j]);
645 tasklet_kill(&pdata->tasklet);
648 clk_disable(pdata->clk);
652 platform_set_drvdata(pdev, NULL);
657 static int s5p_aes_remove(struct platform_device *pdev)
659 struct s5p_aes_dev *pdata = platform_get_drvdata(pdev);
665 for (i = 0; i < ARRAY_SIZE(algs); i++)
666 crypto_unregister_alg(&algs[i]);
668 tasklet_kill(&pdata->tasklet);
670 clk_disable(pdata->clk);
674 platform_set_drvdata(pdev, NULL);
679 static struct platform_driver s5p_aes_crypto = {
680 .probe = s5p_aes_probe,
681 .remove = s5p_aes_remove,
683 .owner = THIS_MODULE,
688 module_platform_driver(s5p_aes_crypto);
690 MODULE_DESCRIPTION("S5PV210 AES hw acceleration support.");
691 MODULE_LICENSE("GPL v2");
692 MODULE_AUTHOR("Vladimir Zapolskiy <vzapolskiy@gmail.com>");