163 lines
4.4 KiB
C
163 lines
4.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* amlogic.h - hardware cryptographic offloader for Amlogic SoC
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*
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* Copyright (C) 2018-2019 Corentin LABBE <clabbe@baylibre.com>
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*/
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#include <crypto/aes.h>
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#include <crypto/engine.h>
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#include <crypto/skcipher.h>
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#include <linux/debugfs.h>
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#include <linux/crypto.h>
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#include <linux/scatterlist.h>
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#define MODE_KEY 1
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#define MODE_AES_128 0x8
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#define MODE_AES_192 0x9
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#define MODE_AES_256 0xa
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#define MESON_DECRYPT 0
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#define MESON_ENCRYPT 1
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#define MESON_OPMODE_ECB 0
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#define MESON_OPMODE_CBC 1
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#define MAXFLOW 2
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#define MAXDESC 64
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#define DESC_LAST BIT(18)
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#define DESC_ENCRYPTION BIT(28)
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#define DESC_OWN BIT(31)
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/*
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* struct meson_desc - Descriptor for DMA operations
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* Note that without datasheet, some are unknown
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* @t_status: Descriptor of the cipher operation (see description below)
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* @t_src: Physical address of data to read
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* @t_dst: Physical address of data to write
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* t_status is segmented like this:
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* @len: 0-16 length of data to operate
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* @irq: 17 Ignored by hardware
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* @eoc: 18 End means the descriptor is the last
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* @loop: 19 Unknown
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* @mode: 20-23 Type of algorithm (AES, SHA)
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* @begin: 24 Unknown
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* @end: 25 Unknown
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* @op_mode: 26-27 Blockmode (CBC, ECB)
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* @enc: 28 0 means decryption, 1 is for encryption
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* @block: 29 Unknown
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* @error: 30 Unknown
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* @owner: 31 owner of the descriptor, 1 own by HW
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*/
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struct meson_desc {
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__le32 t_status;
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__le32 t_src;
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__le32 t_dst;
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};
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/*
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* struct meson_flow - Information used by each flow
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* @engine: ptr to the crypto_engine for this flow
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* @keylen: keylen for this flow operation
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* @complete: completion for the current task on this flow
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* @status: set to 1 by interrupt if task is done
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* @t_phy: Physical address of task
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* @tl: pointer to the current ce_task for this flow
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* @stat_req: number of request done by this flow
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*/
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struct meson_flow {
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struct crypto_engine *engine;
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struct completion complete;
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int status;
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unsigned int keylen;
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dma_addr_t t_phy;
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struct meson_desc *tl;
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#ifdef CONFIG_CRYPTO_DEV_AMLOGIC_GXL_DEBUG
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unsigned long stat_req;
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#endif
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};
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/*
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* struct meson_dev - main container for all this driver information
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* @base: base address of amlogic-crypto
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* @busclk: bus clock for amlogic-crypto
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* @dev: the platform device
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* @chanlist: array of all flow
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* @flow: flow to use in next request
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* @irqs: IRQ numbers for amlogic-crypto
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* @dbgfs_dir: Debugfs dentry for statistic directory
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* @dbgfs_stats: Debugfs dentry for statistic counters
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*/
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struct meson_dev {
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void __iomem *base;
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struct clk *busclk;
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struct device *dev;
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struct meson_flow *chanlist;
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atomic_t flow;
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int *irqs;
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#ifdef CONFIG_CRYPTO_DEV_AMLOGIC_GXL_DEBUG
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struct dentry *dbgfs_dir;
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#endif
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};
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/*
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* struct meson_cipher_req_ctx - context for a skcipher request
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* @op_dir: direction (encrypt vs decrypt) for this request
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* @flow: the flow to use for this request
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*/
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struct meson_cipher_req_ctx {
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u32 op_dir;
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int flow;
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struct skcipher_request fallback_req; // keep at the end
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};
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/*
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* struct meson_cipher_tfm_ctx - context for a skcipher TFM
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* @enginectx: crypto_engine used by this TFM
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* @key: pointer to key data
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* @keylen: len of the key
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* @keymode: The keymode(type and size of key) associated with this TFM
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* @mc: pointer to the private data of driver handling this TFM
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* @fallback_tfm: pointer to the fallback TFM
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*/
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struct meson_cipher_tfm_ctx {
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struct crypto_engine_ctx enginectx;
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u32 *key;
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u32 keylen;
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u32 keymode;
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struct meson_dev *mc;
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struct crypto_skcipher *fallback_tfm;
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};
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/*
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* struct meson_alg_template - crypto_alg template
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* @type: the CRYPTO_ALG_TYPE for this template
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* @blockmode: the type of block operation
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* @mc: pointer to the meson_dev structure associated with this template
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* @alg: one of sub struct must be used
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* @stat_req: number of request done on this template
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* @stat_fb: total of all data len done on this template
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*/
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struct meson_alg_template {
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u32 type;
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u32 blockmode;
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union {
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struct skcipher_alg skcipher;
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} alg;
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struct meson_dev *mc;
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#ifdef CONFIG_CRYPTO_DEV_AMLOGIC_GXL_DEBUG
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unsigned long stat_req;
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unsigned long stat_fb;
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#endif
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};
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int meson_enqueue(struct crypto_async_request *areq, u32 type);
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int meson_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
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unsigned int keylen);
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int meson_cipher_init(struct crypto_tfm *tfm);
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void meson_cipher_exit(struct crypto_tfm *tfm);
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int meson_skdecrypt(struct skcipher_request *areq);
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int meson_skencrypt(struct skcipher_request *areq);
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