crypto: amlogic - Add crypto accelerator for amlogic GXL

This patch adds support for the amlogic GXL cryptographic offloader present
on GXL SoCs.

This driver supports AES cipher in CBC/ECB mode.

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 170 insertions, 0 deletions

diff --git a/drivers/crypto/amlogic/amlogic-gxl.h b/drivers/crypto/amlogic/amlogic-gxl.h
new file mode 100644
index 000000000000..fd9192b4050b
--- /dev/null
+++ b/drivers/crypto/amlogic/amlogic-gxl.h
@@ -0,0 +1,170 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * amlogic.h - hardware cryptographic offloader for Amlogic SoC
+ *
+ * Copyright (C) 2018-2019 Corentin LABBE <clabbe@baylibre.com>
+ */
+#include <crypto/aes.h>
+#include <crypto/engine.h>
+#include <crypto/skcipher.h>
+#include <linux/debugfs.h>
+#include <linux/crypto.h>
+#include <linux/scatterlist.h>
+
+#define MODE_KEY 1
+#define MODE_AES_128 0x8
+#define MODE_AES_192 0x9
+#define MODE_AES_256 0xa
+
+#define MESON_DECRYPT 0
+#define MESON_ENCRYPT 1
+
+#define MESON_OPMODE_ECB 0
+#define MESON_OPMODE_CBC 1
+
+#define MAXFLOW 2
+
+#define MAXDESC 64
+
+/*
+ * struct meson_desc - Descriptor for DMA operations
+ * Note that without datasheet, some are unknown
+ * @len:	length of data to operate
+ * @irq:	Ignored by hardware
+ * @eoc:	End of descriptor
+ * @loop:	Unknown
+ * @mode:	Type of algorithm (AES, SHA)
+ * @begin:	Unknown
+ * @end:	Unknown
+ * @op_mode:	Blockmode (CBC, ECB)
+ * @block:	Unknown
+ * @error:	Unknown
+ * @owner:	owner of the descriptor, 1 own by HW
+ * @t_src:	Physical address of data to read
+ * @t_dst:	Physical address of data to write
+ */
+struct meson_desc {
+	union {
+		u32 t_status;
+		struct {
+			u32 len:17;
+			u32 irq:1;
+			u32 eoc:1;
+			u32 loop:1;
+			u32 mode:4;
+			u32 begin:1;
+			u32 end:1;
+			u32 op_mode:2;
+			u32 enc:1;
+			u32 block:1;
+			u32 error:1;
+			u32 owner:1;
+		};
+	};
+	u32 t_src;
+	u32 t_dst;
+};
+
+/*
+ * struct meson_flow - Information used by each flow
+ * @engine:	ptr to the crypto_engine for this flow
+ * @keylen:	keylen for this flow operation
+ * @complete:	completion for the current task on this flow
+ * @status:	set to 1 by interrupt if task is done
+ * @t_phy:	Physical address of task
+ * @tl:		pointer to the current ce_task for this flow
+ * @stat_req:	number of request done by this flow
+ */
+struct meson_flow {
+	struct crypto_engine *engine;
+	struct completion complete;
+	int status;
+	unsigned int keylen;
+	dma_addr_t t_phy;
+	struct meson_desc *tl;
+#ifdef CONFIG_CRYPTO_DEV_AMLOGIC_GXL_DEBUG
+	unsigned long stat_req;
+#endif
+};
+
+/*
+ * struct meson_dev - main container for all this driver information
+ * @base:	base address of amlogic-crypto
+ * @busclk:	bus clock for amlogic-crypto
+ * @dev:	the platform device
+ * @chanlist:	array of all flow
+ * @flow:	flow to use in next request
+ * @irqs:	IRQ numbers for amlogic-crypto
+ * @dbgfs_dir:	Debugfs dentry for statistic directory
+ * @dbgfs_stats: Debugfs dentry for statistic counters
+ */
+struct meson_dev {
+	void __iomem *base;
+	struct clk *busclk;
+	struct device *dev;
+	struct meson_flow *chanlist;
+	atomic_t flow;
+	int *irqs;
+#ifdef CONFIG_CRYPTO_DEV_AMLOGIC_GXL_DEBUG
+	struct dentry *dbgfs_dir;
+#endif
+};
+
+/*
+ * struct meson_cipher_req_ctx - context for a skcipher request
+ * @op_dir:	direction (encrypt vs decrypt) for this request
+ * @flow:	the flow to use for this request
+ */
+struct meson_cipher_req_ctx {
+	u32 op_dir;
+	int flow;
+};
+
+/*
+ * struct meson_cipher_tfm_ctx - context for a skcipher TFM
+ * @enginectx:		crypto_engine used by this TFM
+ * @key:		pointer to key data
+ * @keylen:		len of the key
+ * @keymode:		The keymode(type and size of key) associated with this TFM
+ * @mc:			pointer to the private data of driver handling this TFM
+ * @fallback_tfm:	pointer to the fallback TFM
+ */
+struct meson_cipher_tfm_ctx {
+	struct crypto_engine_ctx enginectx;
+	u32 *key;
+	u32 keylen;
+	u32 keymode;
+	struct meson_dev *mc;
+	struct crypto_sync_skcipher *fallback_tfm;
+};
+
+/*
+ * struct meson_alg_template - crypto_alg template
+ * @type:		the CRYPTO_ALG_TYPE for this template
+ * @blockmode:		the type of block operation
+ * @mc:			pointer to the meson_dev structure associated with this template
+ * @alg:		one of sub struct must be used
+ * @stat_req:		number of request done on this template
+ * @stat_fb:		total of all data len done on this template
+ */
+struct meson_alg_template {
+	u32 type;
+	u32 blockmode;
+	union {
+		struct skcipher_alg skcipher;
+	} alg;
+	struct meson_dev *mc;
+#ifdef CONFIG_CRYPTO_DEV_AMLOGIC_GXL_DEBUG
+	unsigned long stat_req;
+	unsigned long stat_fb;
+#endif
+};
+
+int meson_enqueue(struct crypto_async_request *areq, u32 type);
+
+int meson_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
+		     unsigned int keylen);
+int meson_cipher_init(struct crypto_tfm *tfm);
+void meson_cipher_exit(struct crypto_tfm *tfm);
+int meson_skdecrypt(struct skcipher_request *areq);
+int meson_skencrypt(struct skcipher_request *areq);