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/*
* Cryptographic API.
*
* Support for OMAP AES HW ACCELERATOR defines
*
* Copyright (c) 2015 Texas Instruments Incorporated
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
*/
#ifndef __OMAP_AES_H__
#define __OMAP_AES_H__
#include <crypto/engine.h>
#define DST_MAXBURST 4
#define DMA_MIN (DST_MAXBURST * sizeof(u32))
#define _calc_walked(inout) (dd->inout##_walk.offset - dd->inout##_sg->offset)
/*
* OMAP TRM gives bitfields as start:end, where start is the higher bit
* number. For example 7:0
*/
#define FLD_MASK(start, end) (((1 << ((start) - (end) + 1)) - 1) << (end))
#define FLD_VAL(val, start, end) (((val) << (end)) & FLD_MASK(start, end))
#define AES_REG_KEY(dd, x) ((dd)->pdata->key_ofs - \
(((x) ^ 0x01) * 0x04))
#define AES_REG_IV(dd, x) ((dd)->pdata->iv_ofs + ((x) * 0x04))
#define AES_REG_CTRL(dd) ((dd)->pdata->ctrl_ofs)
#define AES_REG_CTRL_CONTEXT_READY BIT(31)
#define AES_REG_CTRL_CTR_WIDTH_MASK GENMASK(8, 7)
#define AES_REG_CTRL_CTR_WIDTH_32 0
#define AES_REG_CTRL_CTR_WIDTH_64 BIT(7)
#define AES_REG_CTRL_CTR_WIDTH_96 BIT(8)
#define AES_REG_CTRL_CTR_WIDTH_128 GENMASK(8, 7)
#define AES_REG_CTRL_GCM GENMASK(17, 16)
#define AES_REG_CTRL_CTR BIT(6)
#define AES_REG_CTRL_CBC BIT(5)
#define AES_REG_CTRL_KEY_SIZE GENMASK(4, 3)
#define AES_REG_CTRL_DIRECTION BIT(2)
#define AES_REG_CTRL_INPUT_READY BIT(1)
#define AES_REG_CTRL_OUTPUT_READY BIT(0)
#define AES_REG_CTRL_MASK GENMASK(24, 2)
#define AES_REG_C_LEN_0 0x54
#define AES_REG_C_LEN_1 0x58
#define AES_REG_A_LEN 0x5C
#define AES_REG_DATA_N(dd, x) ((dd)->pdata->data_ofs + ((x) * 0x04))
#define AES_REG_TAG_N(dd, x) (0x70 + ((x) * 0x04))
#define AES_REG_REV(dd) ((dd)->pdata->rev_ofs)
#define AES_REG_MASK(dd) ((dd)->pdata->mask_ofs)
#define AES_REG_MASK_SIDLE BIT(6)
#define AES_REG_MASK_START BIT(5)
#define AES_REG_MASK_DMA_OUT_EN BIT(3)
#define AES_REG_MASK_DMA_IN_EN BIT(2)
#define AES_REG_MASK_SOFTRESET BIT(1)
#define AES_REG_AUTOIDLE BIT(0)
#define AES_REG_LENGTH_N(x) (0x54 + ((x) * 0x04))
#define AES_REG_IRQ_STATUS(dd) ((dd)->pdata->irq_status_ofs)
#define AES_REG_IRQ_ENABLE(dd) ((dd)->pdata->irq_enable_ofs)
#define AES_REG_IRQ_DATA_IN BIT(1)
#define AES_REG_IRQ_DATA_OUT BIT(2)
#define DEFAULT_TIMEOUT (5 * HZ)
#define DEFAULT_AUTOSUSPEND_DELAY 1000
#define FLAGS_MODE_MASK 0x001f
#define FLAGS_ENCRYPT BIT(0)
#define FLAGS_CBC BIT(1)
#define FLAGS_CTR BIT(2)
#define FLAGS_GCM BIT(3)
#define FLAGS_RFC4106_GCM BIT(4)
#define FLAGS_INIT BIT(5)
#define FLAGS_FAST BIT(6)
#define FLAGS_BUSY BIT(7)
#define FLAGS_IN_DATA_ST_SHIFT 8
#define FLAGS_OUT_DATA_ST_SHIFT 10
#define FLAGS_ASSOC_DATA_ST_SHIFT 12
#define AES_BLOCK_WORDS (AES_BLOCK_SIZE >> 2)
struct omap_aes_gcm_result {
struct completion completion;
int err;
};
struct omap_aes_ctx {
struct crypto_engine_ctx enginectx;
int keylen;
u32 key[AES_KEYSIZE_256 / sizeof(u32)];
u8 nonce[4];
struct crypto_skcipher *fallback;
struct crypto_skcipher *ctr;
};
struct omap_aes_reqctx {
struct omap_aes_dev *dd;
unsigned long mode;
u8 iv[AES_BLOCK_SIZE];
u32 auth_tag[AES_BLOCK_SIZE / sizeof(u32)];
};
#define OMAP_AES_QUEUE_LENGTH 1
#define OMAP_AES_CACHE_SIZE 0
struct omap_aes_algs_info {
struct crypto_alg *algs_list;
unsigned int size;
unsigned int registered;
};
struct omap_aes_aead_algs {
struct aead_alg *algs_list;
unsigned int size;
unsigned int registered;
};
struct omap_aes_pdata {
struct omap_aes_algs_info *algs_info;
unsigned int algs_info_size;
struct omap_aes_aead_algs *aead_algs_info;
void (*trigger)(struct omap_aes_dev *dd, int length);
u32 key_ofs;
u32 iv_ofs;
u32 ctrl_ofs;
u32 data_ofs;
u32 rev_ofs;
u32 mask_ofs;
u32 irq_enable_ofs;
u32 irq_status_ofs;
u32 dma_enable_in;
u32 dma_enable_out;
u32 dma_start;
u32 major_mask;
u32 major_shift;
u32 minor_mask;
u32 minor_shift;
};
struct omap_aes_dev {
struct list_head list;
unsigned long phys_base;
void __iomem *io_base;
struct omap_aes_ctx *ctx;
struct device *dev;
unsigned long flags;
int err;
struct tasklet_struct done_task;
struct aead_queue aead_queue;
spinlock_t lock;
struct ablkcipher_request *req;
struct aead_request *aead_req;
struct crypto_engine *engine;
/*
* total is used by PIO mode for book keeping so introduce
* variable total_save as need it to calc page_order
*/
size_t total;
size_t total_save;
size_t assoc_len;
size_t authsize;
struct scatterlist *in_sg;
struct scatterlist *out_sg;
/* Buffers for copying for unaligned cases */
struct scatterlist in_sgl[2];
struct scatterlist out_sgl;
struct scatterlist *orig_out;
struct scatter_walk in_walk;
struct scatter_walk out_walk;
struct dma_chan *dma_lch_in;
struct dma_chan *dma_lch_out;
int in_sg_len;
int out_sg_len;
int pio_only;
const struct omap_aes_pdata *pdata;
};
u32 omap_aes_read(struct omap_aes_dev *dd, u32 offset);
void omap_aes_write(struct omap_aes_dev *dd, u32 offset, u32 value);
struct omap_aes_dev *omap_aes_find_dev(struct omap_aes_reqctx *rctx);
int omap_aes_gcm_setkey(struct crypto_aead *tfm, const u8 *key,
unsigned int keylen);
int omap_aes_4106gcm_setkey(struct crypto_aead *tfm, const u8 *key,
unsigned int keylen);
int omap_aes_gcm_encrypt(struct aead_request *req);
int omap_aes_gcm_decrypt(struct aead_request *req);
int omap_aes_4106gcm_encrypt(struct aead_request *req);
int omap_aes_4106gcm_decrypt(struct aead_request *req);
int omap_aes_write_ctrl(struct omap_aes_dev *dd);
int omap_aes_crypt_dma_start(struct omap_aes_dev *dd);
int omap_aes_crypt_dma_stop(struct omap_aes_dev *dd);
void omap_aes_gcm_dma_out_callback(void *data);
void omap_aes_clear_copy_flags(struct omap_aes_dev *dd);
#endif
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