text: /* 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
  
  #define DESC_LAST BIT(18)
  #define DESC_ENCRYPTION BIT(28)
  #define DESC_OWN BIT(31)
  
  /*
   * struct meson_desc - Descriptor for DMA operations
   * Note that without datasheet, some are unknown
   * @t_status:	Descriptor of the cipher operation (see description below)
   * @t_src:	Physical address of data to read
   * @t_dst:	Physical address of data to write
   * t_status is segmented like this:
   * @len:	0-16	length of data to operate
   * @irq:	17	Ignored by hardware
   * @eoc:	18	End means the descriptor is the last
   * @loop:	19	Unknown
   * @mode:	20-23	Type of algorithm (AES, SHA)
   * @begin:	24	Unknown
   * @end:	25	Unknown
   * @op_mode:	26-27	Blockmode (CBC, ECB)
   * @enc:	28	0 means decryption, 1 is for encryption
   * @block:	29	Unknown
   * @error:	30	Unknown
   * @owner:	31	owner of the descriptor, 1 own by HW
   */
  struct meson_desc {
  	__le32 t_status;
  	__le32 t_src;
  	__le32 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);
  