drivers/crypto/qce/core.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/clk.h>
   7 #include <linux/dma-mapping.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/module.h>
  10 #include <linux/mod_devicetable.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/types.h>
  14 #include <crypto/algapi.h>
  15 #include <crypto/internal/hash.h>
  16
  17 #include "core.h"
  18 #include "cipher.h"
  19 #include "sha.h"
  20
  21 #define QCE_MAJOR_VERSION5      0x05
  22 #define QCE_QUEUE_LENGTH        1
  23
  24 static const struct qce_algo_ops *qce_ops[] = {
  25 #ifdef CONFIG_CRYPTO_DEV_QCE_SKCIPHER
  26         &skcipher_ops,
  27 #endif
  28 #ifdef CONFIG_CRYPTO_DEV_QCE_SHA
  29         &ahash_ops,
  30 #endif
  31 };
  32
  33 static void qce_unregister_algs(struct qce_device *qce)
  34 {
  35         const struct qce_algo_ops *ops;
  36         int i;
  37
  38         for (i = 0; i < ARRAY_SIZE(qce_ops); i++) {
  39                 ops = qce_ops[i];
  40                 ops->unregister_algs(qce);
  41         }
  42 }
  43
  44 static int qce_register_algs(struct qce_device *qce)
  45 {
  46         const struct qce_algo_ops *ops;
  47         int i, ret = -ENODEV;
  48
  49         for (i = 0; i < ARRAY_SIZE(qce_ops); i++) {
  50                 ops = qce_ops[i];
  51                 ret = ops->register_algs(qce);
  52                 if (ret)
  53                         break;
  54         }
  55
  56         return ret;
  57 }
  58
  59 static int qce_handle_request(struct crypto_async_request *async_req)
  60 {
  61         int ret = -EINVAL, i;
  62         const struct qce_algo_ops *ops;
  63         u32 type = crypto_tfm_alg_type(async_req->tfm);
  64
  65         for (i = 0; i < ARRAY_SIZE(qce_ops); i++) {
  66                 ops = qce_ops[i];
  67                 if (type != ops->type)
  68                         continue;
  69                 ret = ops->async_req_handle(async_req);
  70                 break;
  71         }
  72
  73         return ret;
  74 }
  75
  76 static int qce_handle_queue(struct qce_device *qce,
  77                             struct crypto_async_request *req)
  78 {
  79         struct crypto_async_request *async_req, *backlog;
  80         unsigned long flags;
  81         int ret = 0, err;
  82
  83         spin_lock_irqsave(&qce->lock, flags);
  84
  85         if (req)
  86                 ret = crypto_enqueue_request(&qce->queue, req);
  87
  88         /* busy, do not dequeue request */
  89         if (qce->req) {
  90                 spin_unlock_irqrestore(&qce->lock, flags);
  91                 return ret;
  92         }
  93
  94         backlog = crypto_get_backlog(&qce->queue);
  95         async_req = crypto_dequeue_request(&qce->queue);
  96         if (async_req)
  97                 qce->req = async_req;
  98
  99         spin_unlock_irqrestore(&qce->lock, flags);
 100
 101         if (!async_req)
 102                 return ret;
 103
 104         if (backlog) {
 105                 spin_lock_bh(&qce->lock);
 106                 backlog->complete(backlog, -EINPROGRESS);
 107                 spin_unlock_bh(&qce->lock);
 108         }
 109
 110         err = qce_handle_request(async_req);
 111         if (err) {
 112                 qce->result = err;
 113                 tasklet_schedule(&qce->done_tasklet);
 114         }
 115
 116         return ret;
 117 }
 118
 119 static void qce_tasklet_req_done(unsigned long data)
 120 {
 121         struct qce_device *qce = (struct qce_device *)data;
 122         struct crypto_async_request *req;
 123         unsigned long flags;
 124
 125         spin_lock_irqsave(&qce->lock, flags);
 126         req = qce->req;
 127         qce->req = NULL;
 128         spin_unlock_irqrestore(&qce->lock, flags);
 129
 130         if (req)
 131                 req->complete(req, qce->result);
 132
 133         qce_handle_queue(qce, NULL);
 134 }
 135
 136 static int qce_async_request_enqueue(struct qce_device *qce,
 137                                      struct crypto_async_request *req)
 138 {
 139         return qce_handle_queue(qce, req);
 140 }
 141
 142 static void qce_async_request_done(struct qce_device *qce, int ret)
 143 {
 144         qce->result = ret;
 145         tasklet_schedule(&qce->done_tasklet);
 146 }
 147
 148 static int qce_check_version(struct qce_device *qce)
 149 {
 150         u32 major, minor, step;
 151
 152         qce_get_version(qce, &major, &minor, &step);
 153
 154         /*
 155          * the driver does not support v5 with minor 0 because it has special
 156          * alignment requirements.
 157          */
 158         if (major != QCE_MAJOR_VERSION5 || minor == 0)
 159                 return -ENODEV;
 160
 161         qce->burst_size = QCE_BAM_BURST_SIZE;
 162
 163         /*
 164          * Rx and tx pipes are treated as a pair inside CE.
 165          * Pipe pair number depends on the actual BAM dma pipe
 166          * that is used for transfers. The BAM dma pipes are passed
 167          * from the device tree and used to derive the pipe pair
 168          * id in the CE driver as follows.
 169          *      BAM dma pipes(rx, tx)           CE pipe pair id
 170          *              0,1                             0
 171          *              2,3                             1
 172          *              4,5                             2
 173          *              6,7                             3
 174          *              ...
 175          */
 176         qce->pipe_pair_id = qce->dma.rxchan->chan_id >> 1;
 177
 178         dev_dbg(qce->dev, "Crypto device found, version %d.%d.%d\n",
 179                 major, minor, step);
 180
 181         return 0;
 182 }
 183
 184 static int qce_crypto_probe(struct platform_device *pdev)
 185 {
 186         struct device *dev = &pdev->dev;
 187         struct qce_device *qce;
 188         int ret;
 189
 190         qce = devm_kzalloc(dev, sizeof(*qce), GFP_KERNEL);
 191         if (!qce)
 192                 return -ENOMEM;
 193
 194         qce->dev = dev;
 195         platform_set_drvdata(pdev, qce);
 196
 197         qce->base = devm_platform_ioremap_resource(pdev, 0);
 198         if (IS_ERR(qce->base))
 199                 return PTR_ERR(qce->base);
 200
 201         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 202         if (ret < 0)
 203                 return ret;
 204
 205         qce->core = devm_clk_get(qce->dev, "core");
 206         if (IS_ERR(qce->core))
 207                 return PTR_ERR(qce->core);
 208
 209         qce->iface = devm_clk_get(qce->dev, "iface");
 210         if (IS_ERR(qce->iface))
 211                 return PTR_ERR(qce->iface);
 212
 213         qce->bus = devm_clk_get(qce->dev, "bus");
 214         if (IS_ERR(qce->bus))
 215                 return PTR_ERR(qce->bus);
 216
 217         ret = clk_prepare_enable(qce->core);
 218         if (ret)
 219                 return ret;
 220
 221         ret = clk_prepare_enable(qce->iface);
 222         if (ret)
 223                 goto err_clks_core;
 224
 225         ret = clk_prepare_enable(qce->bus);
 226         if (ret)
 227                 goto err_clks_iface;
 228
 229         ret = qce_dma_request(qce->dev, &qce->dma);
 230         if (ret)
 231                 goto err_clks;
 232
 233         ret = qce_check_version(qce);
 234         if (ret)
 235                 goto err_clks;
 236
 237         spin_lock_init(&qce->lock);
 238         tasklet_init(&qce->done_tasklet, qce_tasklet_req_done,
 239                      (unsigned long)qce);
 240         crypto_init_queue(&qce->queue, QCE_QUEUE_LENGTH);
 241
 242         qce->async_req_enqueue = qce_async_request_enqueue;
 243         qce->async_req_done = qce_async_request_done;
 244
 245         ret = qce_register_algs(qce);
 246         if (ret)
 247                 goto err_dma;
 248
 249         return 0;
 250
 251 err_dma:
 252         qce_dma_release(&qce->dma);
 253 err_clks:
 254         clk_disable_unprepare(qce->bus);
 255 err_clks_iface:
 256         clk_disable_unprepare(qce->iface);
 257 err_clks_core:
 258         clk_disable_unprepare(qce->core);
 259         return ret;
 260 }
 261
 262 static int qce_crypto_remove(struct platform_device *pdev)
 263 {
 264         struct qce_device *qce = platform_get_drvdata(pdev);
 265
 266         tasklet_kill(&qce->done_tasklet);
 267         qce_unregister_algs(qce);
 268         qce_dma_release(&qce->dma);
 269         clk_disable_unprepare(qce->bus);
 270         clk_disable_unprepare(qce->iface);
 271         clk_disable_unprepare(qce->core);
 272         return 0;
 273 }
 274
 275 static const struct of_device_id qce_crypto_of_match[] = {
 276         { .compatible = "qcom,crypto-v5.1", },
 277         { .compatible = "qcom,crypto-v5.4", },
 278         {}
 279 };
 280 MODULE_DEVICE_TABLE(of, qce_crypto_of_match);
 281
 282 static struct platform_driver qce_crypto_driver = {
 283         .probe = qce_crypto_probe,
 284         .remove = qce_crypto_remove,
 285         .driver = {
 286                 .name = KBUILD_MODNAME,
 287                 .of_match_table = qce_crypto_of_match,
 288         },
 289 };
 290 module_platform_driver(qce_crypto_driver);
 291
 292 MODULE_LICENSE("GPL v2");
 293 MODULE_DESCRIPTION("Qualcomm crypto engine driver");
 294 MODULE_ALIAS("platform:" KBUILD_MODNAME);
 295 MODULE_AUTHOR("The Linux Foundation");