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1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Xilinx ZynqMP SHA Driver.
4  * Copyright (c) 2022 Xilinx Inc.
5  */
6 #include <linux/cacheflush.h>
7 #include <crypto/hash.h>
8 #include <crypto/internal/hash.h>
9 #include <crypto/sha3.h>
10 #include <linux/crypto.h>
11 #include <linux/device.h>
12 #include <linux/dma-mapping.h>
13 #include <linux/firmware/xlnx-zynqmp.h>
14 #include <linux/init.h>
15 #include <linux/io.h>
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/platform_device.h>
19
20 #define ZYNQMP_DMA_BIT_MASK             32U
21 #define ZYNQMP_DMA_ALLOC_FIXED_SIZE     0x1000U
22
23 enum zynqmp_sha_op {
24         ZYNQMP_SHA3_INIT = 1,
25         ZYNQMP_SHA3_UPDATE = 2,
26         ZYNQMP_SHA3_FINAL = 4,
27 };
28
29 struct zynqmp_sha_drv_ctx {
30         struct shash_alg sha3_384;
31         struct device *dev;
32 };
33
34 struct zynqmp_sha_tfm_ctx {
35         struct device *dev;
36         struct crypto_shash *fbk_tfm;
37 };
38
39 struct zynqmp_sha_desc_ctx {
40         struct shash_desc fbk_req;
41 };
42
43 static dma_addr_t update_dma_addr, final_dma_addr;
44 static char *ubuf, *fbuf;
45
46 static int zynqmp_sha_init_tfm(struct crypto_shash *hash)
47 {
48         const char *fallback_driver_name = crypto_shash_alg_name(hash);
49         struct zynqmp_sha_tfm_ctx *tfm_ctx = crypto_shash_ctx(hash);
50         struct shash_alg *alg = crypto_shash_alg(hash);
51         struct crypto_shash *fallback_tfm;
52         struct zynqmp_sha_drv_ctx *drv_ctx;
53
54         drv_ctx = container_of(alg, struct zynqmp_sha_drv_ctx, sha3_384);
55         tfm_ctx->dev = drv_ctx->dev;
56
57         /* Allocate a fallback and abort if it failed. */
58         fallback_tfm = crypto_alloc_shash(fallback_driver_name, 0,
59                                           CRYPTO_ALG_NEED_FALLBACK);
60         if (IS_ERR(fallback_tfm))
61                 return PTR_ERR(fallback_tfm);
62
63         tfm_ctx->fbk_tfm = fallback_tfm;
64         hash->descsize += crypto_shash_descsize(tfm_ctx->fbk_tfm);
65
66         return 0;
67 }
68
69 static void zynqmp_sha_exit_tfm(struct crypto_shash *hash)
70 {
71         struct zynqmp_sha_tfm_ctx *tfm_ctx = crypto_shash_ctx(hash);
72
73         if (tfm_ctx->fbk_tfm) {
74                 crypto_free_shash(tfm_ctx->fbk_tfm);
75                 tfm_ctx->fbk_tfm = NULL;
76         }
77
78         memzero_explicit(tfm_ctx, sizeof(struct zynqmp_sha_tfm_ctx));
79 }
80
81 static int zynqmp_sha_init(struct shash_desc *desc)
82 {
83         struct zynqmp_sha_desc_ctx *dctx = shash_desc_ctx(desc);
84         struct zynqmp_sha_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
85
86         dctx->fbk_req.tfm = tctx->fbk_tfm;
87         return crypto_shash_init(&dctx->fbk_req);
88 }
89
90 static int zynqmp_sha_update(struct shash_desc *desc, const u8 *data, unsigned int length)
91 {
92         struct zynqmp_sha_desc_ctx *dctx = shash_desc_ctx(desc);
93
94         return crypto_shash_update(&dctx->fbk_req, data, length);
95 }
96
97 static int zynqmp_sha_final(struct shash_desc *desc, u8 *out)
98 {
99         struct zynqmp_sha_desc_ctx *dctx = shash_desc_ctx(desc);
100
101         return crypto_shash_final(&dctx->fbk_req, out);
102 }
103
104 static int zynqmp_sha_finup(struct shash_desc *desc, const u8 *data, unsigned int length, u8 *out)
105 {
106         struct zynqmp_sha_desc_ctx *dctx = shash_desc_ctx(desc);
107
108         return crypto_shash_finup(&dctx->fbk_req, data, length, out);
109 }
110
111 static int zynqmp_sha_import(struct shash_desc *desc, const void *in)
112 {
113         struct zynqmp_sha_desc_ctx *dctx = shash_desc_ctx(desc);
114         struct zynqmp_sha_tfm_ctx *tctx = crypto_shash_ctx(desc->tfm);
115
116         dctx->fbk_req.tfm = tctx->fbk_tfm;
117         return crypto_shash_import(&dctx->fbk_req, in);
118 }
119
120 static int zynqmp_sha_export(struct shash_desc *desc, void *out)
121 {
122         struct zynqmp_sha_desc_ctx *dctx = shash_desc_ctx(desc);
123
124         return crypto_shash_export(&dctx->fbk_req, out);
125 }
126
127 static int zynqmp_sha_digest(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out)
128 {
129         unsigned int remaining_len = len;
130         int update_size;
131         int ret;
132
133         ret = zynqmp_pm_sha_hash(0, 0, ZYNQMP_SHA3_INIT);
134         if (ret)
135                 return ret;
136
137         while (remaining_len != 0) {
138                 memzero_explicit(ubuf, ZYNQMP_DMA_ALLOC_FIXED_SIZE);
139                 if (remaining_len >= ZYNQMP_DMA_ALLOC_FIXED_SIZE) {
140                         update_size = ZYNQMP_DMA_ALLOC_FIXED_SIZE;
141                         remaining_len -= ZYNQMP_DMA_ALLOC_FIXED_SIZE;
142                 } else {
143                         update_size = remaining_len;
144                         remaining_len = 0;
145                 }
146                 memcpy(ubuf, data, update_size);
147                 flush_icache_range((unsigned long)ubuf, (unsigned long)ubuf + update_size);
148                 ret = zynqmp_pm_sha_hash(update_dma_addr, update_size, ZYNQMP_SHA3_UPDATE);
149                 if (ret)
150                         return ret;
151
152                 data += update_size;
153         }
154
155         ret = zynqmp_pm_sha_hash(final_dma_addr, SHA3_384_DIGEST_SIZE, ZYNQMP_SHA3_FINAL);
156         memcpy(out, fbuf, SHA3_384_DIGEST_SIZE);
157         memzero_explicit(fbuf, SHA3_384_DIGEST_SIZE);
158
159         return ret;
160 }
161
162 static struct zynqmp_sha_drv_ctx sha3_drv_ctx = {
163         .sha3_384 = {
164                 .init = zynqmp_sha_init,
165                 .update = zynqmp_sha_update,
166                 .final = zynqmp_sha_final,
167                 .finup = zynqmp_sha_finup,
168                 .digest = zynqmp_sha_digest,
169                 .export = zynqmp_sha_export,
170                 .import = zynqmp_sha_import,
171                 .init_tfm = zynqmp_sha_init_tfm,
172                 .exit_tfm = zynqmp_sha_exit_tfm,
173                 .descsize = sizeof(struct zynqmp_sha_desc_ctx),
174                 .statesize = sizeof(struct sha3_state),
175                 .digestsize = SHA3_384_DIGEST_SIZE,
176                 .base = {
177                         .cra_name = "sha3-384",
178                         .cra_driver_name = "zynqmp-sha3-384",
179                         .cra_priority = 300,
180                         .cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
181                                      CRYPTO_ALG_ALLOCATES_MEMORY |
182                                      CRYPTO_ALG_NEED_FALLBACK,
183                         .cra_blocksize = SHA3_384_BLOCK_SIZE,
184                         .cra_ctxsize = sizeof(struct zynqmp_sha_tfm_ctx),
185                         .cra_module = THIS_MODULE,
186                 }
187         }
188 };
189
190 static int zynqmp_sha_probe(struct platform_device *pdev)
191 {
192         struct device *dev = &pdev->dev;
193         int err;
194         u32 v;
195
196         /* Verify the hardware is present */
197         err = zynqmp_pm_get_api_version(&v);
198         if (err)
199                 return err;
200
201
202         err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(ZYNQMP_DMA_BIT_MASK));
203         if (err < 0) {
204                 dev_err(dev, "No usable DMA configuration\n");
205                 return err;
206         }
207
208         err = crypto_register_shash(&sha3_drv_ctx.sha3_384);
209         if (err < 0) {
210                 dev_err(dev, "Failed to register shash alg.\n");
211                 return err;
212         }
213
214         sha3_drv_ctx.dev = dev;
215         platform_set_drvdata(pdev, &sha3_drv_ctx);
216
217         ubuf = dma_alloc_coherent(dev, ZYNQMP_DMA_ALLOC_FIXED_SIZE, &update_dma_addr, GFP_KERNEL);
218         if (!ubuf) {
219                 err = -ENOMEM;
220                 goto err_shash;
221         }
222
223         fbuf = dma_alloc_coherent(dev, SHA3_384_DIGEST_SIZE, &final_dma_addr, GFP_KERNEL);
224         if (!fbuf) {
225                 err = -ENOMEM;
226                 goto err_mem;
227         }
228
229         return 0;
230
231 err_mem:
232         dma_free_coherent(sha3_drv_ctx.dev, ZYNQMP_DMA_ALLOC_FIXED_SIZE, ubuf, update_dma_addr);
233
234 err_shash:
235         crypto_unregister_shash(&sha3_drv_ctx.sha3_384);
236
237         return err;
238 }
239
240 static void zynqmp_sha_remove(struct platform_device *pdev)
241 {
242         sha3_drv_ctx.dev = platform_get_drvdata(pdev);
243
244         dma_free_coherent(sha3_drv_ctx.dev, ZYNQMP_DMA_ALLOC_FIXED_SIZE, ubuf, update_dma_addr);
245         dma_free_coherent(sha3_drv_ctx.dev, SHA3_384_DIGEST_SIZE, fbuf, final_dma_addr);
246         crypto_unregister_shash(&sha3_drv_ctx.sha3_384);
247 }
248
249 static struct platform_driver zynqmp_sha_driver = {
250         .probe = zynqmp_sha_probe,
251         .remove_new = zynqmp_sha_remove,
252         .driver = {
253                 .name = "zynqmp-sha3-384",
254         },
255 };
256
257 module_platform_driver(zynqmp_sha_driver);
258 MODULE_DESCRIPTION("ZynqMP SHA3 hardware acceleration support.");
259 MODULE_LICENSE("GPL v2");
260 MODULE_AUTHOR("Harsha <[email protected]>");
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