crypto: aspeed - Add HACE hash driver

Hash and Crypto Engine (HACE) is designed to accelerate the
throughput of hash data digest, encryption, and decryption.

Basically, HACE can be divided into two independently engines
- Hash Engine and Crypto Engine. This patch aims to add HACE
hash engine driver for hash accelerator.

Signed-off-by: Neal Liu <neal_liu@aspeedtech.com>
Signed-off-by: Johnny Huang <johnny_huang@aspeedtech.com>
Reviewed-by: Dhananjay Phadke <dphadke@linux.microsoft.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 206 insertions, 0 deletions

diff --git a/drivers/crypto/aspeed/aspeed-hace.c b/drivers/crypto/aspeed/aspeed-hace.c
new file mode 100644
index 000000000000..23a66f481b62
--- /dev/null
+++ b/drivers/crypto/aspeed/aspeed-hace.c
@@ -0,0 +1,206 @@
+// 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_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");
+	}
+
+	return IRQ_HANDLED;
+}
+
+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
+}
+
+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
+}
+
+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)
+{
+	const struct of_device_id *hace_dev_id;
+	struct aspeed_engine_hash *hash_engine;
+	struct aspeed_hace_dev *hace_dev;
+	struct resource *res;
+	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;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	platform_set_drvdata(pdev, hace_dev);
+
+	hace_dev->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (!hace_dev->regs) {
+		dev_err(&pdev->dev, "Failed to map resources\n");
+		return -ENOMEM;
+	}
+
+	/* Get irq number and register it */
+	hace_dev->irq = platform_get_irq(pdev, 0);
+	if (!hace_dev->irq) {
+		dev_err(&pdev->dev, "Failed to get interrupt\n");
+		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);
+
+	/* 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_hash_start;
+	}
+
+	aspeed_hace_register(hace_dev);
+
+	dev_info(&pdev->dev, "Aspeed Crypto Accelerator successfully registered\n");
+
+	return 0;
+
+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_hash *hash_engine = &hace_dev->hash_engine;
+
+	aspeed_hace_unregister(hace_dev);
+
+	crypto_engine_exit(hace_dev->crypt_engine_hash);
+
+	tasklet_kill(&hash_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");