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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2021 Aspeed Technology Inc.
*/
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include "aspeed-hace.h"
#ifdef CONFIG_CRYPTO_DEV_ASPEED_DEBUG
#define HACE_DBG(d, fmt, ...) \
dev_info((d)->dev, "%s() " fmt, __func__, ##__VA_ARGS__)
#else
#define HACE_DBG(d, fmt, ...) \
dev_dbg((d)->dev, "%s() " fmt, __func__, ##__VA_ARGS__)
#endif
/* HACE interrupt service routine */
static irqreturn_t aspeed_hace_irq(int irq, void *dev)
{
struct aspeed_hace_dev *hace_dev = (struct aspeed_hace_dev *)dev;
struct aspeed_engine_crypto *crypto_engine = &hace_dev->crypto_engine;
struct aspeed_engine_hash *hash_engine = &hace_dev->hash_engine;
u32 sts;
sts = ast_hace_read(hace_dev, ASPEED_HACE_STS);
ast_hace_write(hace_dev, sts, ASPEED_HACE_STS);
HACE_DBG(hace_dev, "irq status: 0x%x\n", sts);
if (sts & HACE_HASH_ISR) {
if (hash_engine->flags & CRYPTO_FLAGS_BUSY)
tasklet_schedule(&hash_engine->done_task);
else
dev_warn(hace_dev->dev, "HASH no active requests.\n");
}
if (sts & HACE_CRYPTO_ISR) {
if (crypto_engine->flags & CRYPTO_FLAGS_BUSY)
tasklet_schedule(&crypto_engine->done_task);
else
dev_warn(hace_dev->dev, "CRYPTO no active requests.\n");
}
return IRQ_HANDLED;
}
static void aspeed_hace_crypto_done_task(unsigned long data)
{
struct aspeed_hace_dev *hace_dev = (struct aspeed_hace_dev *)data;
struct aspeed_engine_crypto *crypto_engine = &hace_dev->crypto_engine;
crypto_engine->resume(hace_dev);
}
static void aspeed_hace_hash_done_task(unsigned long data)
{
struct aspeed_hace_dev *hace_dev = (struct aspeed_hace_dev *)data;
struct aspeed_engine_hash *hash_engine = &hace_dev->hash_engine;
hash_engine->resume(hace_dev);
}
static void aspeed_hace_register(struct aspeed_hace_dev *hace_dev)
{
#ifdef CONFIG_CRYPTO_DEV_ASPEED_HACE_HASH
aspeed_register_hace_hash_algs(hace_dev);
#endif
#ifdef CONFIG_CRYPTO_DEV_ASPEED_HACE_CRYPTO
aspeed_register_hace_crypto_algs(hace_dev);
#endif
}
static void aspeed_hace_unregister(struct aspeed_hace_dev *hace_dev)
{
#ifdef CONFIG_CRYPTO_DEV_ASPEED_HACE_HASH
aspeed_unregister_hace_hash_algs(hace_dev);
#endif
#ifdef CONFIG_CRYPTO_DEV_ASPEED_HACE_CRYPTO
aspeed_unregister_hace_crypto_algs(hace_dev);
#endif
}
static const struct of_device_id aspeed_hace_of_matches[] = {
{ .compatible = "aspeed,ast2500-hace", .data = (void *)5, },
{ .compatible = "aspeed,ast2600-hace", .data = (void *)6, },
{},
};
static int aspeed_hace_probe(struct platform_device *pdev)
{
struct aspeed_engine_crypto *crypto_engine;
const struct of_device_id *hace_dev_id;
struct aspeed_engine_hash *hash_engine;
struct aspeed_hace_dev *hace_dev;
int rc;
hace_dev = devm_kzalloc(&pdev->dev, sizeof(struct aspeed_hace_dev),
GFP_KERNEL);
if (!hace_dev)
return -ENOMEM;
hace_dev_id = of_match_device(aspeed_hace_of_matches, &pdev->dev);
if (!hace_dev_id) {
dev_err(&pdev->dev, "Failed to match hace dev id\n");
return -EINVAL;
}
hace_dev->dev = &pdev->dev;
hace_dev->version = (unsigned long)hace_dev_id->data;
hash_engine = &hace_dev->hash_engine;
crypto_engine = &hace_dev->crypto_engine;
platform_set_drvdata(pdev, hace_dev);
hace_dev->regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
if (IS_ERR(hace_dev->regs))
return PTR_ERR(hace_dev->regs);
/* Get irq number and register it */
hace_dev->irq = platform_get_irq(pdev, 0);
if (hace_dev->irq < 0)
return -ENXIO;
rc = devm_request_irq(&pdev->dev, hace_dev->irq, aspeed_hace_irq, 0,
dev_name(&pdev->dev), hace_dev);
if (rc) {
dev_err(&pdev->dev, "Failed to request interrupt\n");
return rc;
}
/* Get clk and enable it */
hace_dev->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(hace_dev->clk)) {
dev_err(&pdev->dev, "Failed to get clk\n");
return -ENODEV;
}
rc = clk_prepare_enable(hace_dev->clk);
if (rc) {
dev_err(&pdev->dev, "Failed to enable clock 0x%x\n", rc);
return rc;
}
/* Initialize crypto hardware engine structure for hash */
hace_dev->crypt_engine_hash = crypto_engine_alloc_init(hace_dev->dev,
true);
if (!hace_dev->crypt_engine_hash) {
rc = -ENOMEM;
goto clk_exit;
}
rc = crypto_engine_start(hace_dev->crypt_engine_hash);
if (rc)
goto err_engine_hash_start;
tasklet_init(&hash_engine->done_task, aspeed_hace_hash_done_task,
(unsigned long)hace_dev);
/* Initialize crypto hardware engine structure for crypto */
hace_dev->crypt_engine_crypto = crypto_engine_alloc_init(hace_dev->dev,
true);
if (!hace_dev->crypt_engine_crypto) {
rc = -ENOMEM;
goto err_engine_hash_start;
}
rc = crypto_engine_start(hace_dev->crypt_engine_crypto);
if (rc)
goto err_engine_crypto_start;
tasklet_init(&crypto_engine->done_task, aspeed_hace_crypto_done_task,
(unsigned long)hace_dev);
/* Allocate DMA buffer for hash engine input used */
hash_engine->ahash_src_addr =
dmam_alloc_coherent(&pdev->dev,
ASPEED_HASH_SRC_DMA_BUF_LEN,
&hash_engine->ahash_src_dma_addr,
GFP_KERNEL);
if (!hash_engine->ahash_src_addr) {
dev_err(&pdev->dev, "Failed to allocate dma buffer\n");
rc = -ENOMEM;
goto err_engine_crypto_start;
}
/* Allocate DMA buffer for crypto engine context used */
crypto_engine->cipher_ctx =
dmam_alloc_coherent(&pdev->dev,
PAGE_SIZE,
&crypto_engine->cipher_ctx_dma,
GFP_KERNEL);
if (!crypto_engine->cipher_ctx) {
dev_err(&pdev->dev, "Failed to allocate cipher ctx dma\n");
rc = -ENOMEM;
goto err_engine_crypto_start;
}
/* Allocate DMA buffer for crypto engine input used */
crypto_engine->cipher_addr =
dmam_alloc_coherent(&pdev->dev,
ASPEED_CRYPTO_SRC_DMA_BUF_LEN,
&crypto_engine->cipher_dma_addr,
GFP_KERNEL);
if (!crypto_engine->cipher_addr) {
dev_err(&pdev->dev, "Failed to allocate cipher addr dma\n");
rc = -ENOMEM;
goto err_engine_crypto_start;
}
/* Allocate DMA buffer for crypto engine output used */
if (hace_dev->version == AST2600_VERSION) {
crypto_engine->dst_sg_addr =
dmam_alloc_coherent(&pdev->dev,
ASPEED_CRYPTO_DST_DMA_BUF_LEN,
&crypto_engine->dst_sg_dma_addr,
GFP_KERNEL);
if (!crypto_engine->dst_sg_addr) {
dev_err(&pdev->dev, "Failed to allocate dst_sg dma\n");
rc = -ENOMEM;
goto err_engine_crypto_start;
}
}
aspeed_hace_register(hace_dev);
dev_info(&pdev->dev, "Aspeed Crypto Accelerator successfully registered\n");
return 0;
err_engine_crypto_start:
crypto_engine_exit(hace_dev->crypt_engine_crypto);
err_engine_hash_start:
crypto_engine_exit(hace_dev->crypt_engine_hash);
clk_exit:
clk_disable_unprepare(hace_dev->clk);
return rc;
}
static int aspeed_hace_remove(struct platform_device *pdev)
{
struct aspeed_hace_dev *hace_dev = platform_get_drvdata(pdev);
struct aspeed_engine_crypto *crypto_engine = &hace_dev->crypto_engine;
struct aspeed_engine_hash *hash_engine = &hace_dev->hash_engine;
aspeed_hace_unregister(hace_dev);
crypto_engine_exit(hace_dev->crypt_engine_hash);
crypto_engine_exit(hace_dev->crypt_engine_crypto);
tasklet_kill(&hash_engine->done_task);
tasklet_kill(&crypto_engine->done_task);
clk_disable_unprepare(hace_dev->clk);
return 0;
}
MODULE_DEVICE_TABLE(of, aspeed_hace_of_matches);
static struct platform_driver aspeed_hace_driver = {
.probe = aspeed_hace_probe,
.remove = aspeed_hace_remove,
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = aspeed_hace_of_matches,
},
};
module_platform_driver(aspeed_hace_driver);
MODULE_AUTHOR("Neal Liu <neal_liu@aspeedtech.com>");
MODULE_DESCRIPTION("Aspeed HACE driver Crypto Accelerator");
MODULE_LICENSE("GPL");
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