https://github.com/torvalds/linux
Tip revision: 206c5f60a3d902bc4b56dab2de3e88de5eb06108 authored by Linus Torvalds on 09 November 2014, 22:55:29 UTC
Linux 3.18-rc4
Linux 3.18-rc4
Tip revision: 206c5f6
core.c
/*
* Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <crypto/algapi.h>
#include <crypto/internal/hash.h>
#include <crypto/sha.h>
#include "core.h"
#include "cipher.h"
#include "sha.h"
#define QCE_MAJOR_VERSION5 0x05
#define QCE_QUEUE_LENGTH 1
static const struct qce_algo_ops *qce_ops[] = {
&ablkcipher_ops,
&ahash_ops,
};
static void qce_unregister_algs(struct qce_device *qce)
{
const struct qce_algo_ops *ops;
int i;
for (i = 0; i < ARRAY_SIZE(qce_ops); i++) {
ops = qce_ops[i];
ops->unregister_algs(qce);
}
}
static int qce_register_algs(struct qce_device *qce)
{
const struct qce_algo_ops *ops;
int i, ret = -ENODEV;
for (i = 0; i < ARRAY_SIZE(qce_ops); i++) {
ops = qce_ops[i];
ret = ops->register_algs(qce);
if (ret)
break;
}
return ret;
}
static int qce_handle_request(struct crypto_async_request *async_req)
{
int ret = -EINVAL, i;
const struct qce_algo_ops *ops;
u32 type = crypto_tfm_alg_type(async_req->tfm);
for (i = 0; i < ARRAY_SIZE(qce_ops); i++) {
ops = qce_ops[i];
if (type != ops->type)
continue;
ret = ops->async_req_handle(async_req);
break;
}
return ret;
}
static int qce_handle_queue(struct qce_device *qce,
struct crypto_async_request *req)
{
struct crypto_async_request *async_req, *backlog;
unsigned long flags;
int ret = 0, err;
spin_lock_irqsave(&qce->lock, flags);
if (req)
ret = crypto_enqueue_request(&qce->queue, req);
/* busy, do not dequeue request */
if (qce->req) {
spin_unlock_irqrestore(&qce->lock, flags);
return ret;
}
backlog = crypto_get_backlog(&qce->queue);
async_req = crypto_dequeue_request(&qce->queue);
if (async_req)
qce->req = async_req;
spin_unlock_irqrestore(&qce->lock, flags);
if (!async_req)
return ret;
if (backlog) {
spin_lock_bh(&qce->lock);
backlog->complete(backlog, -EINPROGRESS);
spin_unlock_bh(&qce->lock);
}
err = qce_handle_request(async_req);
if (err) {
qce->result = err;
tasklet_schedule(&qce->done_tasklet);
}
return ret;
}
static void qce_tasklet_req_done(unsigned long data)
{
struct qce_device *qce = (struct qce_device *)data;
struct crypto_async_request *req;
unsigned long flags;
spin_lock_irqsave(&qce->lock, flags);
req = qce->req;
qce->req = NULL;
spin_unlock_irqrestore(&qce->lock, flags);
if (req)
req->complete(req, qce->result);
qce_handle_queue(qce, NULL);
}
static int qce_async_request_enqueue(struct qce_device *qce,
struct crypto_async_request *req)
{
return qce_handle_queue(qce, req);
}
static void qce_async_request_done(struct qce_device *qce, int ret)
{
qce->result = ret;
tasklet_schedule(&qce->done_tasklet);
}
static int qce_check_version(struct qce_device *qce)
{
u32 major, minor, step;
qce_get_version(qce, &major, &minor, &step);
/*
* the driver does not support v5 with minor 0 because it has special
* alignment requirements.
*/
if (major != QCE_MAJOR_VERSION5 || minor == 0)
return -ENODEV;
qce->burst_size = QCE_BAM_BURST_SIZE;
qce->pipe_pair_id = 1;
dev_dbg(qce->dev, "Crypto device found, version %d.%d.%d\n",
major, minor, step);
return 0;
}
static int qce_crypto_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct qce_device *qce;
struct resource *res;
int ret;
qce = devm_kzalloc(dev, sizeof(*qce), GFP_KERNEL);
if (!qce)
return -ENOMEM;
qce->dev = dev;
platform_set_drvdata(pdev, qce);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
qce->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(qce->base))
return PTR_ERR(qce->base);
ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
if (ret < 0)
return ret;
qce->core = devm_clk_get(qce->dev, "core");
if (IS_ERR(qce->core))
return PTR_ERR(qce->core);
qce->iface = devm_clk_get(qce->dev, "iface");
if (IS_ERR(qce->iface))
return PTR_ERR(qce->iface);
qce->bus = devm_clk_get(qce->dev, "bus");
if (IS_ERR(qce->bus))
return PTR_ERR(qce->bus);
ret = clk_prepare_enable(qce->core);
if (ret)
return ret;
ret = clk_prepare_enable(qce->iface);
if (ret)
goto err_clks_core;
ret = clk_prepare_enable(qce->bus);
if (ret)
goto err_clks_iface;
ret = qce_dma_request(qce->dev, &qce->dma);
if (ret)
goto err_clks;
ret = qce_check_version(qce);
if (ret)
goto err_clks;
spin_lock_init(&qce->lock);
tasklet_init(&qce->done_tasklet, qce_tasklet_req_done,
(unsigned long)qce);
crypto_init_queue(&qce->queue, QCE_QUEUE_LENGTH);
qce->async_req_enqueue = qce_async_request_enqueue;
qce->async_req_done = qce_async_request_done;
ret = qce_register_algs(qce);
if (ret)
goto err_dma;
return 0;
err_dma:
qce_dma_release(&qce->dma);
err_clks:
clk_disable_unprepare(qce->bus);
err_clks_iface:
clk_disable_unprepare(qce->iface);
err_clks_core:
clk_disable_unprepare(qce->core);
return ret;
}
static int qce_crypto_remove(struct platform_device *pdev)
{
struct qce_device *qce = platform_get_drvdata(pdev);
tasklet_kill(&qce->done_tasklet);
qce_unregister_algs(qce);
qce_dma_release(&qce->dma);
clk_disable_unprepare(qce->bus);
clk_disable_unprepare(qce->iface);
clk_disable_unprepare(qce->core);
return 0;
}
static const struct of_device_id qce_crypto_of_match[] = {
{ .compatible = "qcom,crypto-v5.1", },
{}
};
MODULE_DEVICE_TABLE(of, qce_crypto_of_match);
static struct platform_driver qce_crypto_driver = {
.probe = qce_crypto_probe,
.remove = qce_crypto_remove,
.driver = {
.owner = THIS_MODULE,
.name = KBUILD_MODNAME,
.of_match_table = qce_crypto_of_match,
},
};
module_platform_driver(qce_crypto_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Qualcomm crypto engine driver");
MODULE_ALIAS("platform:" KBUILD_MODNAME);
MODULE_AUTHOR("The Linux Foundation");