drivers/crypto/qce/core.c

   1 /*
   2  * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/module.h>
  17 #include <linux/mod_devicetable.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/spinlock.h>
  20 #include <linux/types.h>
  21 #include <crypto/algapi.h>
  22 #include <crypto/internal/hash.h>
  23 #include <crypto/sha.h>
  24
  25 #include "core.h"
  26 #include "cipher.h"
  27 #include "sha.h"
  28
  29 #define QCE_MAJOR_VERSION5      0x05
  30 #define QCE_QUEUE_LENGTH        1
  31
  32 static const struct qce_algo_ops *qce_ops[] = {
  33         &ablkcipher_ops,
  34         &ahash_ops,
  35 };
  36
  37 static void qce_unregister_algs(struct qce_device *qce)
  38 {
  39         const struct qce_algo_ops *ops;
  40         int i;
  41
  42         for (i = 0; i < ARRAY_SIZE(qce_ops); i++) {
  43                 ops = qce_ops[i];
  44                 ops->unregister_algs(qce);
  45         }
  46 }
  47
  48 static int qce_register_algs(struct qce_device *qce)
  49 {
  50         const struct qce_algo_ops *ops;
  51         int i, ret = -ENODEV;
  52
  53         for (i = 0; i < ARRAY_SIZE(qce_ops); i++) {
  54                 ops = qce_ops[i];
  55                 ret = ops->register_algs(qce);
  56                 if (ret)
  57                         break;
  58         }
  59
  60         return ret;
  61 }
  62
  63 static int qce_handle_request(struct crypto_async_request *async_req)
  64 {
  65         int ret = -EINVAL, i;
  66         const struct qce_algo_ops *ops;
  67         u32 type = crypto_tfm_alg_type(async_req->tfm);
  68
  69         for (i = 0; i < ARRAY_SIZE(qce_ops); i++) {
  70                 ops = qce_ops[i];
  71                 if (type != ops->type)
  72                         continue;
  73                 ret = ops->async_req_handle(async_req);
  74                 break;
  75         }
  76
  77         return ret;
  78 }
  79
  80 static int qce_handle_queue(struct qce_device *qce,
  81                             struct crypto_async_request *req)
  82 {
  83         struct crypto_async_request *async_req, *backlog;
  84         unsigned long flags;
  85         int ret = 0, err;
  86
  87         spin_lock_irqsave(&qce->lock, flags);
  88
  89         if (req)
  90                 ret = crypto_enqueue_request(&qce->queue, req);
  91
  92         /* busy, do not dequeue request */
  93         if (qce->req) {
  94                 spin_unlock_irqrestore(&qce->lock, flags);
  95                 return ret;
  96         }
  97
  98         backlog = crypto_get_backlog(&qce->queue);
  99         async_req = crypto_dequeue_request(&qce->queue);
 100         if (async_req)
 101                 qce->req = async_req;
 102
 103         spin_unlock_irqrestore(&qce->lock, flags);
 104
 105         if (!async_req)
 106                 return ret;
 107
 108         if (backlog) {
 109                 spin_lock_bh(&qce->lock);
 110                 backlog->complete(backlog, -EINPROGRESS);
 111                 spin_unlock_bh(&qce->lock);
 112         }
 113
 114         err = qce_handle_request(async_req);
 115         if (err) {
 116                 qce->result = err;
 117                 tasklet_schedule(&qce->done_tasklet);
 118         }
 119
 120         return ret;
 121 }
 122
 123 static void qce_tasklet_req_done(unsigned long data)
 124 {
 125         struct qce_device *qce = (struct qce_device *)data;
 126         struct crypto_async_request *req;
 127         unsigned long flags;
 128
 129         spin_lock_irqsave(&qce->lock, flags);
 130         req = qce->req;
 131         qce->req = NULL;
 132         spin_unlock_irqrestore(&qce->lock, flags);
 133
 134         if (req)
 135                 req->complete(req, qce->result);
 136
 137         qce_handle_queue(qce, NULL);
 138 }
 139
 140 static int qce_async_request_enqueue(struct qce_device *qce,
 141                                      struct crypto_async_request *req)
 142 {
 143         return qce_handle_queue(qce, req);
 144 }
 145
 146 static void qce_async_request_done(struct qce_device *qce, int ret)
 147 {
 148         qce->result = ret;
 149         tasklet_schedule(&qce->done_tasklet);
 150 }
 151
 152 static int qce_check_version(struct qce_device *qce)
 153 {
 154         u32 major, minor, step;
 155
 156         qce_get_version(qce, &major, &minor, &step);
 157
 158         /*
 159          * the driver does not support v5 with minor 0 because it has special
 160          * alignment requirements.
 161          */
 162         if (major != QCE_MAJOR_VERSION5 || minor == 0)
 163                 return -ENODEV;
 164
 165         qce->burst_size = QCE_BAM_BURST_SIZE;
 166         qce->pipe_pair_id = 1;
 167
 168         dev_dbg(qce->dev, "Crypto device found, version %d.%d.%d\n",
 169                 major, minor, step);
 170
 171         return 0;
 172 }
 173
 174 static int qce_crypto_probe(struct platform_device *pdev)
 175 {
 176         struct device *dev = &pdev->dev;
 177         struct qce_device *qce;
 178         struct resource *res;
 179         int ret;
 180
 181         qce = devm_kzalloc(dev, sizeof(*qce), GFP_KERNEL);
 182         if (!qce)
 183                 return -ENOMEM;
 184
 185         qce->dev = dev;
 186         platform_set_drvdata(pdev, qce);
 187
 188         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 189         qce->base = devm_ioremap_resource(&pdev->dev, res);
 190         if (IS_ERR(qce->base))
 191                 return PTR_ERR(qce->base);
 192
 193         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 194         if (ret < 0)
 195                 return ret;
 196
 197         qce->core = devm_clk_get(qce->dev, "core");
 198         if (IS_ERR(qce->core))
 199                 return PTR_ERR(qce->core);
 200
 201         qce->iface = devm_clk_get(qce->dev, "iface");
 202         if (IS_ERR(qce->iface))
 203                 return PTR_ERR(qce->iface);
 204
 205         qce->bus = devm_clk_get(qce->dev, "bus");
 206         if (IS_ERR(qce->bus))
 207                 return PTR_ERR(qce->bus);
 208
 209         ret = clk_prepare_enable(qce->core);
 210         if (ret)
 211                 return ret;
 212
 213         ret = clk_prepare_enable(qce->iface);
 214         if (ret)
 215                 goto err_clks_core;
 216
 217         ret = clk_prepare_enable(qce->bus);
 218         if (ret)
 219                 goto err_clks_iface;
 220
 221         ret = qce_dma_request(qce->dev, &qce->dma);
 222         if (ret)
 223                 goto err_clks;
 224
 225         ret = qce_check_version(qce);
 226         if (ret)
 227                 goto err_clks;
 228
 229         spin_lock_init(&qce->lock);
 230         tasklet_init(&qce->done_tasklet, qce_tasklet_req_done,
 231                      (unsigned long)qce);
 232         crypto_init_queue(&qce->queue, QCE_QUEUE_LENGTH);
 233
 234         qce->async_req_enqueue = qce_async_request_enqueue;
 235         qce->async_req_done = qce_async_request_done;
 236
 237         ret = qce_register_algs(qce);
 238         if (ret)
 239                 goto err_dma;
 240
 241         return 0;
 242
 243 err_dma:
 244         qce_dma_release(&qce->dma);
 245 err_clks:
 246         clk_disable_unprepare(qce->bus);
 247 err_clks_iface:
 248         clk_disable_unprepare(qce->iface);
 249 err_clks_core:
 250         clk_disable_unprepare(qce->core);
 251         return ret;
 252 }
 253
 254 static int qce_crypto_remove(struct platform_device *pdev)
 255 {
 256         struct qce_device *qce = platform_get_drvdata(pdev);
 257
 258         tasklet_kill(&qce->done_tasklet);
 259         qce_unregister_algs(qce);
 260         qce_dma_release(&qce->dma);
 261         clk_disable_unprepare(qce->bus);
 262         clk_disable_unprepare(qce->iface);
 263         clk_disable_unprepare(qce->core);
 264         return 0;
 265 }
 266
 267 static const struct of_device_id qce_crypto_of_match[] = {
 268         { .compatible = "qcom,crypto-v5.1", },
 269         {}
 270 };
 271 MODULE_DEVICE_TABLE(of, qce_crypto_of_match);
 272
 273 static struct platform_driver qce_crypto_driver = {
 274         .probe = qce_crypto_probe,
 275         .remove = qce_crypto_remove,
 276         .driver = {
 277                 .name = KBUILD_MODNAME,
 278                 .of_match_table = qce_crypto_of_match,
 279         },
 280 };
 281 module_platform_driver(qce_crypto_driver);
 282
 283 MODULE_LICENSE("GPL v2");
 284 MODULE_DESCRIPTION("Qualcomm crypto engine driver");
 285 MODULE_ALIAS("platform:" KBUILD_MODNAME);
 286 MODULE_AUTHOR("The Linux Foundation");