tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * K3 DTHE V2 crypto accelerator driver
4 *
5 * Copyright (C) Texas Instruments 2025 - https://www.ti.com
6 * Author: T Pratham <t-pratham@ti.com>
7 */
8
9#include <crypto/aes.h>
10#include <crypto/algapi.h>
11#include <crypto/engine.h>
12#include <crypto/internal/aead.h>
13#include <crypto/internal/skcipher.h>
14
15#include "dthev2-common.h"
16
17#include <linux/delay.h>
18#include <linux/dmaengine.h>
19#include <linux/dmapool.h>
20#include <linux/dma-mapping.h>
21#include <linux/io.h>
22#include <linux/kernel.h>
23#include <linux/module.h>
24#include <linux/mod_devicetable.h>
25#include <linux/platform_device.h>
26#include <linux/scatterlist.h>
27
28#define DRIVER_NAME "dthev2"
29
30static struct dthe_list dthe_dev_list = {
31 .dev_list = LIST_HEAD_INIT(dthe_dev_list.dev_list),
32 .lock = __SPIN_LOCK_UNLOCKED(dthe_dev_list.lock),
33};
34
35struct dthe_data *dthe_get_dev(struct dthe_tfm_ctx *ctx)
36{
37 struct dthe_data *dev_data;
38
39 if (ctx->dev_data)
40 return ctx->dev_data;
41
42 spin_lock_bh(&dthe_dev_list.lock);
43 dev_data = list_first_entry(&dthe_dev_list.dev_list, struct dthe_data, list);
44 if (dev_data)
45 list_move_tail(&dev_data->list, &dthe_dev_list.dev_list);
46 spin_unlock_bh(&dthe_dev_list.lock);
47
48 return dev_data;
49}
50
51static int dthe_dma_init(struct dthe_data *dev_data)
52{
53 int ret;
54 struct dma_slave_config cfg;
55
56 dev_data->dma_aes_rx = NULL;
57 dev_data->dma_aes_tx = NULL;
58 dev_data->dma_sha_tx = NULL;
59
60 dev_data->dma_aes_rx = dma_request_chan(dev_data->dev, "rx");
61 if (IS_ERR(dev_data->dma_aes_rx)) {
62 return dev_err_probe(dev_data->dev, PTR_ERR(dev_data->dma_aes_rx),
63 "Unable to request rx DMA channel\n");
64 }
65
66 dev_data->dma_aes_tx = dma_request_chan(dev_data->dev, "tx1");
67 if (IS_ERR(dev_data->dma_aes_tx)) {
68 ret = dev_err_probe(dev_data->dev, PTR_ERR(dev_data->dma_aes_tx),
69 "Unable to request tx1 DMA channel\n");
70 goto err_dma_aes_tx;
71 }
72
73 dev_data->dma_sha_tx = dma_request_chan(dev_data->dev, "tx2");
74 if (IS_ERR(dev_data->dma_sha_tx)) {
75 ret = dev_err_probe(dev_data->dev, PTR_ERR(dev_data->dma_sha_tx),
76 "Unable to request tx2 DMA channel\n");
77 goto err_dma_sha_tx;
78 }
79
80 memzero_explicit(&cfg, sizeof(cfg));
81
82 cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
83 cfg.src_maxburst = 4;
84
85 ret = dmaengine_slave_config(dev_data->dma_aes_rx, &cfg);
86 if (ret) {
87 dev_err(dev_data->dev, "Can't configure IN dmaengine slave: %d\n", ret);
88 goto err_dma_config;
89 }
90
91 cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
92 cfg.dst_maxburst = 4;
93
94 ret = dmaengine_slave_config(dev_data->dma_aes_tx, &cfg);
95 if (ret) {
96 dev_err(dev_data->dev, "Can't configure OUT dmaengine slave: %d\n", ret);
97 goto err_dma_config;
98 }
99
100 return 0;
101
102err_dma_config:
103 dma_release_channel(dev_data->dma_sha_tx);
104err_dma_sha_tx:
105 dma_release_channel(dev_data->dma_aes_tx);
106err_dma_aes_tx:
107 dma_release_channel(dev_data->dma_aes_rx);
108
109 return ret;
110}
111
112static int dthe_register_algs(void)
113{
114 return dthe_register_aes_algs();
115}
116
117static void dthe_unregister_algs(void)
118{
119 dthe_unregister_aes_algs();
120}
121
122static int dthe_probe(struct platform_device *pdev)
123{
124 struct device *dev = &pdev->dev;
125 struct dthe_data *dev_data;
126 int ret;
127
128 dev_data = devm_kzalloc(dev, sizeof(*dev_data), GFP_KERNEL);
129 if (!dev_data)
130 return -ENOMEM;
131
132 dev_data->dev = dev;
133 dev_data->regs = devm_platform_ioremap_resource(pdev, 0);
134 if (IS_ERR(dev_data->regs))
135 return PTR_ERR(dev_data->regs);
136
137 platform_set_drvdata(pdev, dev_data);
138
139 spin_lock(&dthe_dev_list.lock);
140 list_add(&dev_data->list, &dthe_dev_list.dev_list);
141 spin_unlock(&dthe_dev_list.lock);
142
143 ret = dthe_dma_init(dev_data);
144 if (ret)
145 goto probe_dma_err;
146
147 dev_data->engine = crypto_engine_alloc_init(dev, 1);
148 if (!dev_data->engine) {
149 ret = -ENOMEM;
150 goto probe_engine_err;
151 }
152
153 ret = crypto_engine_start(dev_data->engine);
154 if (ret) {
155 dev_err(dev, "Failed to start crypto engine\n");
156 goto probe_engine_start_err;
157 }
158
159 ret = dthe_register_algs();
160 if (ret) {
161 dev_err(dev, "Failed to register algs\n");
162 goto probe_engine_start_err;
163 }
164
165 return 0;
166
167probe_engine_start_err:
168 crypto_engine_exit(dev_data->engine);
169probe_engine_err:
170 dma_release_channel(dev_data->dma_aes_rx);
171 dma_release_channel(dev_data->dma_aes_tx);
172 dma_release_channel(dev_data->dma_sha_tx);
173probe_dma_err:
174 spin_lock(&dthe_dev_list.lock);
175 list_del(&dev_data->list);
176 spin_unlock(&dthe_dev_list.lock);
177
178 return ret;
179}
180
181static void dthe_remove(struct platform_device *pdev)
182{
183 struct dthe_data *dev_data = platform_get_drvdata(pdev);
184
185 spin_lock(&dthe_dev_list.lock);
186 list_del(&dev_data->list);
187 spin_unlock(&dthe_dev_list.lock);
188
189 dthe_unregister_algs();
190
191 crypto_engine_exit(dev_data->engine);
192
193 dma_release_channel(dev_data->dma_aes_rx);
194 dma_release_channel(dev_data->dma_aes_tx);
195 dma_release_channel(dev_data->dma_sha_tx);
196}
197
198static const struct of_device_id dthe_of_match[] = {
199 { .compatible = "ti,am62l-dthev2", },
200 {},
201};
202MODULE_DEVICE_TABLE(of, dthe_of_match);
203
204static struct platform_driver dthe_driver = {
205 .probe = dthe_probe,
206 .remove = dthe_remove,
207 .driver = {
208 .name = DRIVER_NAME,
209 .of_match_table = dthe_of_match,
210 },
211};
212
213module_platform_driver(dthe_driver);
214
215MODULE_AUTHOR("T Pratham <t-pratham@ti.com>");
216MODULE_DESCRIPTION("Texas Instruments DTHE V2 driver");
217MODULE_LICENSE("GPL");