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/clk.h>
15 #include <linux/crypto.h>
16 #include <linux/dma-mapping.h>
17 #include <linux/err.h>
18 #include <linux/errno.h>
19 #include <linux/init.h>
20 #include <linux/interrupt.h>
22 #include <linux/kernel.h>
23 #include <linux/module.h>
25 #include <linux/platform_device.h>
26 #include <linux/scatterlist.h>
28 #include <crypto/ctr.h>
29 #include <crypto/aes.h>
30 #include <crypto/algapi.h>
31 #include <crypto/scatterwalk.h>
33 #define _SBF(s, v) ((v) << (s))
35 /* Feed control registers */
36 #define SSS_REG_FCINTSTAT 0x0000
37 #define SSS_FCINTSTAT_BRDMAINT BIT(3)
38 #define SSS_FCINTSTAT_BTDMAINT BIT(2)
39 #define SSS_FCINTSTAT_HRDMAINT BIT(1)
40 #define SSS_FCINTSTAT_PKDMAINT BIT(0)
42 #define SSS_REG_FCINTENSET 0x0004
43 #define SSS_FCINTENSET_BRDMAINTENSET BIT(3)
44 #define SSS_FCINTENSET_BTDMAINTENSET BIT(2)
45 #define SSS_FCINTENSET_HRDMAINTENSET BIT(1)
46 #define SSS_FCINTENSET_PKDMAINTENSET BIT(0)
48 #define SSS_REG_FCINTENCLR 0x0008
49 #define SSS_FCINTENCLR_BRDMAINTENCLR BIT(3)
50 #define SSS_FCINTENCLR_BTDMAINTENCLR BIT(2)
51 #define SSS_FCINTENCLR_HRDMAINTENCLR BIT(1)
52 #define SSS_FCINTENCLR_PKDMAINTENCLR BIT(0)
54 #define SSS_REG_FCINTPEND 0x000C
55 #define SSS_FCINTPEND_BRDMAINTP BIT(3)
56 #define SSS_FCINTPEND_BTDMAINTP BIT(2)
57 #define SSS_FCINTPEND_HRDMAINTP BIT(1)
58 #define SSS_FCINTPEND_PKDMAINTP BIT(0)
60 #define SSS_REG_FCFIFOSTAT 0x0010
61 #define SSS_FCFIFOSTAT_BRFIFOFUL BIT(7)
62 #define SSS_FCFIFOSTAT_BRFIFOEMP BIT(6)
63 #define SSS_FCFIFOSTAT_BTFIFOFUL BIT(5)
64 #define SSS_FCFIFOSTAT_BTFIFOEMP BIT(4)
65 #define SSS_FCFIFOSTAT_HRFIFOFUL BIT(3)
66 #define SSS_FCFIFOSTAT_HRFIFOEMP BIT(2)
67 #define SSS_FCFIFOSTAT_PKFIFOFUL BIT(1)
68 #define SSS_FCFIFOSTAT_PKFIFOEMP BIT(0)
70 #define SSS_REG_FCFIFOCTRL 0x0014
71 #define SSS_FCFIFOCTRL_DESSEL BIT(2)
72 #define SSS_HASHIN_INDEPENDENT _SBF(0, 0x00)
73 #define SSS_HASHIN_CIPHER_INPUT _SBF(0, 0x01)
74 #define SSS_HASHIN_CIPHER_OUTPUT _SBF(0, 0x02)
76 #define SSS_REG_FCBRDMAS 0x0020
77 #define SSS_REG_FCBRDMAL 0x0024
78 #define SSS_REG_FCBRDMAC 0x0028
79 #define SSS_FCBRDMAC_BYTESWAP BIT(1)
80 #define SSS_FCBRDMAC_FLUSH BIT(0)
82 #define SSS_REG_FCBTDMAS 0x0030
83 #define SSS_REG_FCBTDMAL 0x0034
84 #define SSS_REG_FCBTDMAC 0x0038
85 #define SSS_FCBTDMAC_BYTESWAP BIT(1)
86 #define SSS_FCBTDMAC_FLUSH BIT(0)
88 #define SSS_REG_FCHRDMAS 0x0040
89 #define SSS_REG_FCHRDMAL 0x0044
90 #define SSS_REG_FCHRDMAC 0x0048
91 #define SSS_FCHRDMAC_BYTESWAP BIT(1)
92 #define SSS_FCHRDMAC_FLUSH BIT(0)
94 #define SSS_REG_FCPKDMAS 0x0050
95 #define SSS_REG_FCPKDMAL 0x0054
96 #define SSS_REG_FCPKDMAC 0x0058
97 #define SSS_FCPKDMAC_BYTESWAP BIT(3)
98 #define SSS_FCPKDMAC_DESCEND BIT(2)
99 #define SSS_FCPKDMAC_TRANSMIT BIT(1)
100 #define SSS_FCPKDMAC_FLUSH BIT(0)
102 #define SSS_REG_FCPKDMAO 0x005C
105 #define SSS_REG_AES_CONTROL 0x00
106 #define SSS_AES_BYTESWAP_DI BIT(11)
107 #define SSS_AES_BYTESWAP_DO BIT(10)
108 #define SSS_AES_BYTESWAP_IV BIT(9)
109 #define SSS_AES_BYTESWAP_CNT BIT(8)
110 #define SSS_AES_BYTESWAP_KEY BIT(7)
111 #define SSS_AES_KEY_CHANGE_MODE BIT(6)
112 #define SSS_AES_KEY_SIZE_128 _SBF(4, 0x00)
113 #define SSS_AES_KEY_SIZE_192 _SBF(4, 0x01)
114 #define SSS_AES_KEY_SIZE_256 _SBF(4, 0x02)
115 #define SSS_AES_FIFO_MODE BIT(3)
116 #define SSS_AES_CHAIN_MODE_ECB _SBF(1, 0x00)
117 #define SSS_AES_CHAIN_MODE_CBC _SBF(1, 0x01)
118 #define SSS_AES_CHAIN_MODE_CTR _SBF(1, 0x02)
119 #define SSS_AES_MODE_DECRYPT BIT(0)
121 #define SSS_REG_AES_STATUS 0x04
122 #define SSS_AES_BUSY BIT(2)
123 #define SSS_AES_INPUT_READY BIT(1)
124 #define SSS_AES_OUTPUT_READY BIT(0)
126 #define SSS_REG_AES_IN_DATA(s) (0x10 + (s << 2))
127 #define SSS_REG_AES_OUT_DATA(s) (0x20 + (s << 2))
128 #define SSS_REG_AES_IV_DATA(s) (0x30 + (s << 2))
129 #define SSS_REG_AES_CNT_DATA(s) (0x40 + (s << 2))
130 #define SSS_REG_AES_KEY_DATA(s) (0x80 + (s << 2))
132 #define SSS_REG(dev, reg) ((dev)->ioaddr + (SSS_REG_##reg))
133 #define SSS_READ(dev, reg) __raw_readl(SSS_REG(dev, reg))
134 #define SSS_WRITE(dev, reg, val) __raw_writel((val), SSS_REG(dev, reg))
136 #define SSS_AES_REG(dev, reg) ((dev)->aes_ioaddr + SSS_REG_##reg)
137 #define SSS_AES_WRITE(dev, reg, val) __raw_writel((val), \
138 SSS_AES_REG(dev, reg))
140 /* HW engine modes */
141 #define FLAGS_AES_DECRYPT BIT(0)
142 #define FLAGS_AES_MODE_MASK _SBF(1, 0x03)
143 #define FLAGS_AES_CBC _SBF(1, 0x01)
144 #define FLAGS_AES_CTR _SBF(1, 0x02)
146 #define AES_KEY_LEN 16
147 #define CRYPTO_QUEUE_LEN 1
150 * struct samsung_aes_variant - platform specific SSS driver data
151 * @aes_offset: AES register offset from SSS module's base.
153 * Specifies platform specific configuration of SSS module.
154 * Note: A structure for driver specific platform data is used for future
155 * expansion of its usage.
157 struct samsung_aes_variant {
158 unsigned int aes_offset;
161 struct s5p_aes_reqctx {
166 struct s5p_aes_dev *dev;
168 uint8_t aes_key[AES_MAX_KEY_SIZE];
169 uint8_t nonce[CTR_RFC3686_NONCE_SIZE];
176 void __iomem *ioaddr;
177 void __iomem *aes_ioaddr;
180 struct ablkcipher_request *req;
181 struct s5p_aes_ctx *ctx;
182 struct scatterlist *sg_src;
183 struct scatterlist *sg_dst;
185 /* In case of unaligned access: */
186 struct scatterlist *sg_src_cpy;
187 struct scatterlist *sg_dst_cpy;
189 struct tasklet_struct tasklet;
190 struct crypto_queue queue;
194 struct samsung_aes_variant *variant;
197 static struct s5p_aes_dev *s5p_dev;
199 static const struct samsung_aes_variant s5p_aes_data = {
200 .aes_offset = 0x4000,
203 static const struct samsung_aes_variant exynos_aes_data = {
207 static const struct of_device_id s5p_sss_dt_match[] = {
209 .compatible = "samsung,s5pv210-secss",
210 .data = &s5p_aes_data,
213 .compatible = "samsung,exynos4210-secss",
214 .data = &exynos_aes_data,
218 MODULE_DEVICE_TABLE(of, s5p_sss_dt_match);
220 static inline struct samsung_aes_variant *find_s5p_sss_version
221 (struct platform_device *pdev)
223 if (IS_ENABLED(CONFIG_OF) && (pdev->dev.of_node)) {
224 const struct of_device_id *match;
226 match = of_match_node(s5p_sss_dt_match,
228 return (struct samsung_aes_variant *)match->data;
230 return (struct samsung_aes_variant *)
231 platform_get_device_id(pdev)->driver_data;
234 static void s5p_set_dma_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
236 SSS_WRITE(dev, FCBRDMAS, sg_dma_address(sg));
237 SSS_WRITE(dev, FCBRDMAL, sg_dma_len(sg));
240 static void s5p_set_dma_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
242 SSS_WRITE(dev, FCBTDMAS, sg_dma_address(sg));
243 SSS_WRITE(dev, FCBTDMAL, sg_dma_len(sg));
246 static void s5p_free_sg_cpy(struct s5p_aes_dev *dev, struct scatterlist **sg)
253 len = ALIGN(dev->req->nbytes, AES_BLOCK_SIZE);
254 free_pages((unsigned long)sg_virt(*sg), get_order(len));
260 static void s5p_sg_copy_buf(void *buf, struct scatterlist *sg,
261 unsigned int nbytes, int out)
263 struct scatter_walk walk;
268 scatterwalk_start(&walk, sg);
269 scatterwalk_copychunks(buf, &walk, nbytes, out);
270 scatterwalk_done(&walk, out, 0);
273 static void s5p_aes_complete(struct s5p_aes_dev *dev, int err)
275 if (dev->sg_dst_cpy) {
277 "Copying %d bytes of output data back to original place\n",
279 s5p_sg_copy_buf(sg_virt(dev->sg_dst_cpy), dev->req->dst,
280 dev->req->nbytes, 1);
282 s5p_free_sg_cpy(dev, &dev->sg_src_cpy);
283 s5p_free_sg_cpy(dev, &dev->sg_dst_cpy);
285 /* holding a lock outside */
286 dev->req->base.complete(&dev->req->base, err);
290 static void s5p_unset_outdata(struct s5p_aes_dev *dev)
292 dma_unmap_sg(dev->dev, dev->sg_dst, 1, DMA_FROM_DEVICE);
295 static void s5p_unset_indata(struct s5p_aes_dev *dev)
297 dma_unmap_sg(dev->dev, dev->sg_src, 1, DMA_TO_DEVICE);
300 static int s5p_make_sg_cpy(struct s5p_aes_dev *dev, struct scatterlist *src,
301 struct scatterlist **dst)
306 *dst = kmalloc(sizeof(**dst), GFP_ATOMIC);
310 len = ALIGN(dev->req->nbytes, AES_BLOCK_SIZE);
311 pages = (void *)__get_free_pages(GFP_ATOMIC, get_order(len));
318 s5p_sg_copy_buf(pages, src, dev->req->nbytes, 0);
320 sg_init_table(*dst, 1);
321 sg_set_buf(*dst, pages, len);
326 static int s5p_set_outdata(struct s5p_aes_dev *dev, struct scatterlist *sg)
335 err = dma_map_sg(dev->dev, sg, 1, DMA_FROM_DEVICE);
348 static int s5p_set_indata(struct s5p_aes_dev *dev, struct scatterlist *sg)
357 err = dma_map_sg(dev->dev, sg, 1, DMA_TO_DEVICE);
371 * Returns true if new transmitting (output) data is ready and its
372 * address+length have to be written to device (by calling
373 * s5p_set_dma_outdata()). False otherwise.
375 static bool s5p_aes_tx(struct s5p_aes_dev *dev)
380 s5p_unset_outdata(dev);
382 if (!sg_is_last(dev->sg_dst)) {
383 err = s5p_set_outdata(dev, sg_next(dev->sg_dst));
385 s5p_aes_complete(dev, err);
389 s5p_aes_complete(dev, err);
392 tasklet_schedule(&dev->tasklet);
399 * Returns true if new receiving (input) data is ready and its
400 * address+length have to be written to device (by calling
401 * s5p_set_dma_indata()). False otherwise.
403 static bool s5p_aes_rx(struct s5p_aes_dev *dev)
408 s5p_unset_indata(dev);
410 if (!sg_is_last(dev->sg_src)) {
411 err = s5p_set_indata(dev, sg_next(dev->sg_src));
413 s5p_aes_complete(dev, err);
421 static irqreturn_t s5p_aes_interrupt(int irq, void *dev_id)
423 struct platform_device *pdev = dev_id;
424 struct s5p_aes_dev *dev = platform_get_drvdata(pdev);
425 bool set_dma_tx = false;
426 bool set_dma_rx = false;
430 spin_lock_irqsave(&dev->lock, flags);
432 status = SSS_READ(dev, FCINTSTAT);
433 if (status & SSS_FCINTSTAT_BRDMAINT)
434 set_dma_rx = s5p_aes_rx(dev);
435 if (status & SSS_FCINTSTAT_BTDMAINT)
436 set_dma_tx = s5p_aes_tx(dev);
438 SSS_WRITE(dev, FCINTPEND, status);
441 * Writing length of DMA block (either receiving or transmitting)
442 * will start the operation immediately, so this should be done
443 * at the end (even after clearing pending interrupts to not miss the
447 s5p_set_dma_outdata(dev, dev->sg_dst);
449 s5p_set_dma_indata(dev, dev->sg_src);
451 spin_unlock_irqrestore(&dev->lock, flags);
456 static void s5p_set_aes(struct s5p_aes_dev *dev,
457 uint8_t *key, uint8_t *iv, unsigned int keylen)
459 void __iomem *keystart;
462 memcpy_toio(dev->aes_ioaddr + SSS_REG_AES_IV_DATA(0), iv, 0x10);
464 if (keylen == AES_KEYSIZE_256)
465 keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(0);
466 else if (keylen == AES_KEYSIZE_192)
467 keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(2);
469 keystart = dev->aes_ioaddr + SSS_REG_AES_KEY_DATA(4);
471 memcpy_toio(keystart, key, keylen);
474 static bool s5p_is_sg_aligned(struct scatterlist *sg)
477 if (!IS_ALIGNED(sg->length, AES_BLOCK_SIZE))
485 static int s5p_set_indata_start(struct s5p_aes_dev *dev,
486 struct ablkcipher_request *req)
488 struct scatterlist *sg;
491 dev->sg_src_cpy = NULL;
493 if (!s5p_is_sg_aligned(sg)) {
495 "At least one unaligned source scatter list, making a copy\n");
496 err = s5p_make_sg_cpy(dev, sg, &dev->sg_src_cpy);
500 sg = dev->sg_src_cpy;
503 err = s5p_set_indata(dev, sg);
505 s5p_free_sg_cpy(dev, &dev->sg_src_cpy);
512 static int s5p_set_outdata_start(struct s5p_aes_dev *dev,
513 struct ablkcipher_request *req)
515 struct scatterlist *sg;
518 dev->sg_dst_cpy = NULL;
520 if (!s5p_is_sg_aligned(sg)) {
522 "At least one unaligned dest scatter list, making a copy\n");
523 err = s5p_make_sg_cpy(dev, sg, &dev->sg_dst_cpy);
527 sg = dev->sg_dst_cpy;
530 err = s5p_set_outdata(dev, sg);
532 s5p_free_sg_cpy(dev, &dev->sg_dst_cpy);
539 static void s5p_aes_crypt_start(struct s5p_aes_dev *dev, unsigned long mode)
541 struct ablkcipher_request *req = dev->req;
542 uint32_t aes_control;
546 aes_control = SSS_AES_KEY_CHANGE_MODE;
547 if (mode & FLAGS_AES_DECRYPT)
548 aes_control |= SSS_AES_MODE_DECRYPT;
550 if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CBC)
551 aes_control |= SSS_AES_CHAIN_MODE_CBC;
552 else if ((mode & FLAGS_AES_MODE_MASK) == FLAGS_AES_CTR)
553 aes_control |= SSS_AES_CHAIN_MODE_CTR;
555 if (dev->ctx->keylen == AES_KEYSIZE_192)
556 aes_control |= SSS_AES_KEY_SIZE_192;
557 else if (dev->ctx->keylen == AES_KEYSIZE_256)
558 aes_control |= SSS_AES_KEY_SIZE_256;
560 aes_control |= SSS_AES_FIFO_MODE;
562 /* as a variant it is possible to use byte swapping on DMA side */
563 aes_control |= SSS_AES_BYTESWAP_DI
564 | SSS_AES_BYTESWAP_DO
565 | SSS_AES_BYTESWAP_IV
566 | SSS_AES_BYTESWAP_KEY
567 | SSS_AES_BYTESWAP_CNT;
569 spin_lock_irqsave(&dev->lock, flags);
571 SSS_WRITE(dev, FCINTENCLR,
572 SSS_FCINTENCLR_BTDMAINTENCLR | SSS_FCINTENCLR_BRDMAINTENCLR);
573 SSS_WRITE(dev, FCFIFOCTRL, 0x00);
575 err = s5p_set_indata_start(dev, req);
579 err = s5p_set_outdata_start(dev, req);
583 SSS_AES_WRITE(dev, AES_CONTROL, aes_control);
584 s5p_set_aes(dev, dev->ctx->aes_key, req->info, dev->ctx->keylen);
586 s5p_set_dma_indata(dev, dev->sg_src);
587 s5p_set_dma_outdata(dev, dev->sg_dst);
589 SSS_WRITE(dev, FCINTENSET,
590 SSS_FCINTENSET_BTDMAINTENSET | SSS_FCINTENSET_BRDMAINTENSET);
592 spin_unlock_irqrestore(&dev->lock, flags);
597 s5p_unset_indata(dev);
600 s5p_aes_complete(dev, err);
601 spin_unlock_irqrestore(&dev->lock, flags);
604 static void s5p_tasklet_cb(unsigned long data)
606 struct s5p_aes_dev *dev = (struct s5p_aes_dev *)data;
607 struct crypto_async_request *async_req, *backlog;
608 struct s5p_aes_reqctx *reqctx;
611 spin_lock_irqsave(&dev->lock, flags);
612 backlog = crypto_get_backlog(&dev->queue);
613 async_req = crypto_dequeue_request(&dev->queue);
617 spin_unlock_irqrestore(&dev->lock, flags);
620 spin_unlock_irqrestore(&dev->lock, flags);
623 backlog->complete(backlog, -EINPROGRESS);
625 dev->req = ablkcipher_request_cast(async_req);
626 dev->ctx = crypto_tfm_ctx(dev->req->base.tfm);
627 reqctx = ablkcipher_request_ctx(dev->req);
629 s5p_aes_crypt_start(dev, reqctx->mode);
632 static int s5p_aes_handle_req(struct s5p_aes_dev *dev,
633 struct ablkcipher_request *req)
638 spin_lock_irqsave(&dev->lock, flags);
639 err = ablkcipher_enqueue_request(&dev->queue, req);
641 spin_unlock_irqrestore(&dev->lock, flags);
646 spin_unlock_irqrestore(&dev->lock, flags);
648 tasklet_schedule(&dev->tasklet);
654 static int s5p_aes_crypt(struct ablkcipher_request *req, unsigned long mode)
656 struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
657 struct s5p_aes_reqctx *reqctx = ablkcipher_request_ctx(req);
658 struct s5p_aes_ctx *ctx = crypto_ablkcipher_ctx(tfm);
659 struct s5p_aes_dev *dev = ctx->dev;
661 if (!IS_ALIGNED(req->nbytes, AES_BLOCK_SIZE)) {
662 dev_err(dev->dev, "request size is not exact amount of AES blocks\n");
668 return s5p_aes_handle_req(dev, req);
671 static int s5p_aes_setkey(struct crypto_ablkcipher *cipher,
672 const uint8_t *key, unsigned int keylen)
674 struct crypto_tfm *tfm = crypto_ablkcipher_tfm(cipher);
675 struct s5p_aes_ctx *ctx = crypto_tfm_ctx(tfm);
677 if (keylen != AES_KEYSIZE_128 &&
678 keylen != AES_KEYSIZE_192 &&
679 keylen != AES_KEYSIZE_256)
682 memcpy(ctx->aes_key, key, keylen);
683 ctx->keylen = keylen;
688 static int s5p_aes_ecb_encrypt(struct ablkcipher_request *req)
690 return s5p_aes_crypt(req, 0);
693 static int s5p_aes_ecb_decrypt(struct ablkcipher_request *req)
695 return s5p_aes_crypt(req, FLAGS_AES_DECRYPT);
698 static int s5p_aes_cbc_encrypt(struct ablkcipher_request *req)
700 return s5p_aes_crypt(req, FLAGS_AES_CBC);
703 static int s5p_aes_cbc_decrypt(struct ablkcipher_request *req)
705 return s5p_aes_crypt(req, FLAGS_AES_DECRYPT | FLAGS_AES_CBC);
708 static int s5p_aes_cra_init(struct crypto_tfm *tfm)
710 struct s5p_aes_ctx *ctx = crypto_tfm_ctx(tfm);
713 tfm->crt_ablkcipher.reqsize = sizeof(struct s5p_aes_reqctx);
718 static struct crypto_alg algs[] = {
720 .cra_name = "ecb(aes)",
721 .cra_driver_name = "ecb-aes-s5p",
723 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
725 CRYPTO_ALG_KERN_DRIVER_ONLY,
726 .cra_blocksize = AES_BLOCK_SIZE,
727 .cra_ctxsize = sizeof(struct s5p_aes_ctx),
728 .cra_alignmask = 0x0f,
729 .cra_type = &crypto_ablkcipher_type,
730 .cra_module = THIS_MODULE,
731 .cra_init = s5p_aes_cra_init,
732 .cra_u.ablkcipher = {
733 .min_keysize = AES_MIN_KEY_SIZE,
734 .max_keysize = AES_MAX_KEY_SIZE,
735 .setkey = s5p_aes_setkey,
736 .encrypt = s5p_aes_ecb_encrypt,
737 .decrypt = s5p_aes_ecb_decrypt,
741 .cra_name = "cbc(aes)",
742 .cra_driver_name = "cbc-aes-s5p",
744 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
746 CRYPTO_ALG_KERN_DRIVER_ONLY,
747 .cra_blocksize = AES_BLOCK_SIZE,
748 .cra_ctxsize = sizeof(struct s5p_aes_ctx),
749 .cra_alignmask = 0x0f,
750 .cra_type = &crypto_ablkcipher_type,
751 .cra_module = THIS_MODULE,
752 .cra_init = s5p_aes_cra_init,
753 .cra_u.ablkcipher = {
754 .min_keysize = AES_MIN_KEY_SIZE,
755 .max_keysize = AES_MAX_KEY_SIZE,
756 .ivsize = AES_BLOCK_SIZE,
757 .setkey = s5p_aes_setkey,
758 .encrypt = s5p_aes_cbc_encrypt,
759 .decrypt = s5p_aes_cbc_decrypt,
764 static int s5p_aes_probe(struct platform_device *pdev)
766 struct device *dev = &pdev->dev;
767 int i, j, err = -ENODEV;
768 struct samsung_aes_variant *variant;
769 struct s5p_aes_dev *pdata;
770 struct resource *res;
775 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
779 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
780 pdata->ioaddr = devm_ioremap_resource(&pdev->dev, res);
781 if (IS_ERR(pdata->ioaddr))
782 return PTR_ERR(pdata->ioaddr);
784 variant = find_s5p_sss_version(pdev);
786 pdata->clk = devm_clk_get(dev, "secss");
787 if (IS_ERR(pdata->clk)) {
788 dev_err(dev, "failed to find secss clock source\n");
792 err = clk_prepare_enable(pdata->clk);
794 dev_err(dev, "Enabling SSS clk failed, err %d\n", err);
798 spin_lock_init(&pdata->lock);
800 pdata->aes_ioaddr = pdata->ioaddr + variant->aes_offset;
802 pdata->irq_fc = platform_get_irq(pdev, 0);
803 if (pdata->irq_fc < 0) {
805 dev_warn(dev, "feed control interrupt is not available.\n");
808 err = devm_request_irq(dev, pdata->irq_fc, s5p_aes_interrupt,
809 IRQF_SHARED, pdev->name, pdev);
811 dev_warn(dev, "feed control interrupt is not available.\n");
816 pdata->variant = variant;
818 platform_set_drvdata(pdev, pdata);
821 tasklet_init(&pdata->tasklet, s5p_tasklet_cb, (unsigned long)pdata);
822 crypto_init_queue(&pdata->queue, CRYPTO_QUEUE_LEN);
824 for (i = 0; i < ARRAY_SIZE(algs); i++) {
825 err = crypto_register_alg(&algs[i]);
830 dev_info(dev, "s5p-sss driver registered\n");
835 dev_err(dev, "can't register '%s': %d\n", algs[i].cra_name, err);
837 for (j = 0; j < i; j++)
838 crypto_unregister_alg(&algs[j]);
840 tasklet_kill(&pdata->tasklet);
843 clk_disable_unprepare(pdata->clk);
850 static int s5p_aes_remove(struct platform_device *pdev)
852 struct s5p_aes_dev *pdata = platform_get_drvdata(pdev);
858 for (i = 0; i < ARRAY_SIZE(algs); i++)
859 crypto_unregister_alg(&algs[i]);
861 tasklet_kill(&pdata->tasklet);
863 clk_disable_unprepare(pdata->clk);
870 static struct platform_driver s5p_aes_crypto = {
871 .probe = s5p_aes_probe,
872 .remove = s5p_aes_remove,
875 .of_match_table = s5p_sss_dt_match,
879 module_platform_driver(s5p_aes_crypto);
881 MODULE_DESCRIPTION("S5PV210 AES hw acceleration support.");
882 MODULE_LICENSE("GPL v2");
883 MODULE_AUTHOR("Vladimir Zapolskiy <vzapolskiy@gmail.com>");