mirror of https://gitee.com/openkylin/linux.git
1173 lines
28 KiB
C
1173 lines
28 KiB
C
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/*
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* Copyright (C) STMicroelectronics SA 2017
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* Author: Fabien Dessenne <fabien.dessenne@st.com>
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* License terms: GNU General Public License (GPL), version 2
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/iopoll.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/reset.h>
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#include <crypto/aes.h>
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#include <crypto/des.h>
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#include <crypto/engine.h>
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#include <crypto/scatterwalk.h>
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#define DRIVER_NAME "stm32-cryp"
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/* Bit [0] encrypt / decrypt */
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#define FLG_ENCRYPT BIT(0)
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/* Bit [8..1] algo & operation mode */
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#define FLG_AES BIT(1)
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#define FLG_DES BIT(2)
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#define FLG_TDES BIT(3)
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#define FLG_ECB BIT(4)
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#define FLG_CBC BIT(5)
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#define FLG_CTR BIT(6)
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/* Mode mask = bits [15..0] */
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#define FLG_MODE_MASK GENMASK(15, 0)
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/* Registers */
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#define CRYP_CR 0x00000000
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#define CRYP_SR 0x00000004
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#define CRYP_DIN 0x00000008
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#define CRYP_DOUT 0x0000000C
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#define CRYP_DMACR 0x00000010
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#define CRYP_IMSCR 0x00000014
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#define CRYP_RISR 0x00000018
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#define CRYP_MISR 0x0000001C
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#define CRYP_K0LR 0x00000020
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#define CRYP_K0RR 0x00000024
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#define CRYP_K1LR 0x00000028
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#define CRYP_K1RR 0x0000002C
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#define CRYP_K2LR 0x00000030
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#define CRYP_K2RR 0x00000034
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#define CRYP_K3LR 0x00000038
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#define CRYP_K3RR 0x0000003C
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#define CRYP_IV0LR 0x00000040
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#define CRYP_IV0RR 0x00000044
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#define CRYP_IV1LR 0x00000048
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#define CRYP_IV1RR 0x0000004C
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/* Registers values */
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#define CR_DEC_NOT_ENC 0x00000004
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#define CR_TDES_ECB 0x00000000
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#define CR_TDES_CBC 0x00000008
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#define CR_DES_ECB 0x00000010
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#define CR_DES_CBC 0x00000018
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#define CR_AES_ECB 0x00000020
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#define CR_AES_CBC 0x00000028
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#define CR_AES_CTR 0x00000030
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#define CR_AES_KP 0x00000038
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#define CR_AES_UNKNOWN 0xFFFFFFFF
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#define CR_ALGO_MASK 0x00080038
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#define CR_DATA32 0x00000000
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#define CR_DATA16 0x00000040
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#define CR_DATA8 0x00000080
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#define CR_DATA1 0x000000C0
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#define CR_KEY128 0x00000000
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#define CR_KEY192 0x00000100
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#define CR_KEY256 0x00000200
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#define CR_FFLUSH 0x00004000
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#define CR_CRYPEN 0x00008000
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#define SR_BUSY 0x00000010
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#define SR_OFNE 0x00000004
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#define IMSCR_IN BIT(0)
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#define IMSCR_OUT BIT(1)
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#define MISR_IN BIT(0)
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#define MISR_OUT BIT(1)
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/* Misc */
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#define AES_BLOCK_32 (AES_BLOCK_SIZE / sizeof(u32))
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#define _walked_in (cryp->in_walk.offset - cryp->in_sg->offset)
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#define _walked_out (cryp->out_walk.offset - cryp->out_sg->offset)
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struct stm32_cryp_ctx {
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struct stm32_cryp *cryp;
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int keylen;
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u32 key[AES_KEYSIZE_256 / sizeof(u32)];
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unsigned long flags;
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};
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struct stm32_cryp_reqctx {
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unsigned long mode;
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};
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struct stm32_cryp {
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struct list_head list;
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struct device *dev;
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void __iomem *regs;
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struct clk *clk;
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unsigned long flags;
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u32 irq_status;
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struct stm32_cryp_ctx *ctx;
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struct crypto_engine *engine;
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struct mutex lock; /* protects req */
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struct ablkcipher_request *req;
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size_t hw_blocksize;
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size_t total_in;
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size_t total_in_save;
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size_t total_out;
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size_t total_out_save;
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struct scatterlist *in_sg;
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struct scatterlist *out_sg;
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struct scatterlist *out_sg_save;
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struct scatterlist in_sgl;
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struct scatterlist out_sgl;
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bool sgs_copied;
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int in_sg_len;
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int out_sg_len;
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struct scatter_walk in_walk;
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struct scatter_walk out_walk;
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u32 last_ctr[4];
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};
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struct stm32_cryp_list {
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struct list_head dev_list;
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spinlock_t lock; /* protect dev_list */
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};
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static struct stm32_cryp_list cryp_list = {
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.dev_list = LIST_HEAD_INIT(cryp_list.dev_list),
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.lock = __SPIN_LOCK_UNLOCKED(cryp_list.lock),
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};
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static inline bool is_aes(struct stm32_cryp *cryp)
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{
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return cryp->flags & FLG_AES;
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}
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static inline bool is_des(struct stm32_cryp *cryp)
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{
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return cryp->flags & FLG_DES;
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}
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static inline bool is_tdes(struct stm32_cryp *cryp)
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{
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return cryp->flags & FLG_TDES;
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}
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static inline bool is_ecb(struct stm32_cryp *cryp)
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{
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return cryp->flags & FLG_ECB;
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}
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static inline bool is_cbc(struct stm32_cryp *cryp)
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{
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return cryp->flags & FLG_CBC;
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}
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static inline bool is_ctr(struct stm32_cryp *cryp)
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{
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return cryp->flags & FLG_CTR;
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}
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static inline bool is_encrypt(struct stm32_cryp *cryp)
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{
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return cryp->flags & FLG_ENCRYPT;
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}
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static inline bool is_decrypt(struct stm32_cryp *cryp)
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{
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return !is_encrypt(cryp);
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}
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static inline u32 stm32_cryp_read(struct stm32_cryp *cryp, u32 ofst)
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{
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return readl_relaxed(cryp->regs + ofst);
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}
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static inline void stm32_cryp_write(struct stm32_cryp *cryp, u32 ofst, u32 val)
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{
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writel_relaxed(val, cryp->regs + ofst);
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}
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static inline int stm32_cryp_wait_busy(struct stm32_cryp *cryp)
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{
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u32 status;
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return readl_relaxed_poll_timeout(cryp->regs + CRYP_SR, status,
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!(status & SR_BUSY), 10, 100000);
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}
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static struct stm32_cryp *stm32_cryp_find_dev(struct stm32_cryp_ctx *ctx)
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{
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struct stm32_cryp *tmp, *cryp = NULL;
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spin_lock_bh(&cryp_list.lock);
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if (!ctx->cryp) {
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list_for_each_entry(tmp, &cryp_list.dev_list, list) {
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cryp = tmp;
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break;
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}
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ctx->cryp = cryp;
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} else {
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cryp = ctx->cryp;
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}
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spin_unlock_bh(&cryp_list.lock);
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return cryp;
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}
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static int stm32_cryp_check_aligned(struct scatterlist *sg, size_t total,
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size_t align)
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{
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int len = 0;
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if (!total)
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return 0;
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if (!IS_ALIGNED(total, align))
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return -EINVAL;
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while (sg) {
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if (!IS_ALIGNED(sg->offset, sizeof(u32)))
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return -EINVAL;
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if (!IS_ALIGNED(sg->length, align))
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return -EINVAL;
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len += sg->length;
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sg = sg_next(sg);
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}
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if (len != total)
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return -EINVAL;
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return 0;
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}
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static int stm32_cryp_check_io_aligned(struct stm32_cryp *cryp)
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{
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int ret;
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ret = stm32_cryp_check_aligned(cryp->in_sg, cryp->total_in,
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cryp->hw_blocksize);
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if (ret)
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return ret;
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ret = stm32_cryp_check_aligned(cryp->out_sg, cryp->total_out,
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cryp->hw_blocksize);
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return ret;
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}
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static void sg_copy_buf(void *buf, struct scatterlist *sg,
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unsigned int start, unsigned int nbytes, int out)
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{
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struct scatter_walk walk;
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if (!nbytes)
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return;
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scatterwalk_start(&walk, sg);
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scatterwalk_advance(&walk, start);
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scatterwalk_copychunks(buf, &walk, nbytes, out);
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scatterwalk_done(&walk, out, 0);
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}
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static int stm32_cryp_copy_sgs(struct stm32_cryp *cryp)
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{
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void *buf_in, *buf_out;
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int pages, total_in, total_out;
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if (!stm32_cryp_check_io_aligned(cryp)) {
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cryp->sgs_copied = 0;
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return 0;
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}
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total_in = ALIGN(cryp->total_in, cryp->hw_blocksize);
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pages = total_in ? get_order(total_in) : 1;
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buf_in = (void *)__get_free_pages(GFP_ATOMIC, pages);
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total_out = ALIGN(cryp->total_out, cryp->hw_blocksize);
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pages = total_out ? get_order(total_out) : 1;
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buf_out = (void *)__get_free_pages(GFP_ATOMIC, pages);
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if (!buf_in || !buf_out) {
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dev_err(cryp->dev, "Can't allocate pages when unaligned\n");
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cryp->sgs_copied = 0;
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return -EFAULT;
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}
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sg_copy_buf(buf_in, cryp->in_sg, 0, cryp->total_in, 0);
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sg_init_one(&cryp->in_sgl, buf_in, total_in);
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cryp->in_sg = &cryp->in_sgl;
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cryp->in_sg_len = 1;
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sg_init_one(&cryp->out_sgl, buf_out, total_out);
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cryp->out_sg_save = cryp->out_sg;
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cryp->out_sg = &cryp->out_sgl;
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cryp->out_sg_len = 1;
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cryp->sgs_copied = 1;
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return 0;
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}
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static void stm32_cryp_hw_write_iv(struct stm32_cryp *cryp, u32 *iv)
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{
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if (!iv)
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return;
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stm32_cryp_write(cryp, CRYP_IV0LR, cpu_to_be32(*iv++));
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stm32_cryp_write(cryp, CRYP_IV0RR, cpu_to_be32(*iv++));
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if (is_aes(cryp)) {
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stm32_cryp_write(cryp, CRYP_IV1LR, cpu_to_be32(*iv++));
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stm32_cryp_write(cryp, CRYP_IV1RR, cpu_to_be32(*iv++));
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}
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}
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static void stm32_cryp_hw_write_key(struct stm32_cryp *c)
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{
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unsigned int i;
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int r_id;
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if (is_des(c)) {
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stm32_cryp_write(c, CRYP_K1LR, cpu_to_be32(c->ctx->key[0]));
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stm32_cryp_write(c, CRYP_K1RR, cpu_to_be32(c->ctx->key[1]));
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} else {
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r_id = CRYP_K3RR;
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for (i = c->ctx->keylen / sizeof(u32); i > 0; i--, r_id -= 4)
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stm32_cryp_write(c, r_id,
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cpu_to_be32(c->ctx->key[i - 1]));
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}
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}
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static u32 stm32_cryp_get_hw_mode(struct stm32_cryp *cryp)
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{
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if (is_aes(cryp) && is_ecb(cryp))
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return CR_AES_ECB;
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if (is_aes(cryp) && is_cbc(cryp))
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return CR_AES_CBC;
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if (is_aes(cryp) && is_ctr(cryp))
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return CR_AES_CTR;
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if (is_des(cryp) && is_ecb(cryp))
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return CR_DES_ECB;
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if (is_des(cryp) && is_cbc(cryp))
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return CR_DES_CBC;
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if (is_tdes(cryp) && is_ecb(cryp))
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return CR_TDES_ECB;
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if (is_tdes(cryp) && is_cbc(cryp))
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return CR_TDES_CBC;
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dev_err(cryp->dev, "Unknown mode\n");
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return CR_AES_UNKNOWN;
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}
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static int stm32_cryp_hw_init(struct stm32_cryp *cryp)
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{
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int ret;
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u32 cfg, hw_mode;
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/* Disable interrupt */
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stm32_cryp_write(cryp, CRYP_IMSCR, 0);
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/* Set key */
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stm32_cryp_hw_write_key(cryp);
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/* Set configuration */
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cfg = CR_DATA8 | CR_FFLUSH;
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switch (cryp->ctx->keylen) {
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case AES_KEYSIZE_128:
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cfg |= CR_KEY128;
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break;
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case AES_KEYSIZE_192:
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cfg |= CR_KEY192;
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break;
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default:
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case AES_KEYSIZE_256:
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cfg |= CR_KEY256;
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break;
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}
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hw_mode = stm32_cryp_get_hw_mode(cryp);
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if (hw_mode == CR_AES_UNKNOWN)
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return -EINVAL;
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/* AES ECB/CBC decrypt: run key preparation first */
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if (is_decrypt(cryp) &&
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((hw_mode == CR_AES_ECB) || (hw_mode == CR_AES_CBC))) {
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stm32_cryp_write(cryp, CRYP_CR, cfg | CR_AES_KP | CR_CRYPEN);
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/* Wait for end of processing */
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ret = stm32_cryp_wait_busy(cryp);
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if (ret) {
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dev_err(cryp->dev, "Timeout (key preparation)\n");
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return ret;
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}
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}
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cfg |= hw_mode;
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if (is_decrypt(cryp))
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cfg |= CR_DEC_NOT_ENC;
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/* Apply config and flush (valid when CRYPEN = 0) */
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||
|
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||
|
|
||
|
switch (hw_mode) {
|
||
|
case CR_DES_CBC:
|
||
|
case CR_TDES_CBC:
|
||
|
case CR_AES_CBC:
|
||
|
case CR_AES_CTR:
|
||
|
stm32_cryp_hw_write_iv(cryp, (u32 *)cryp->req->info);
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
/* Enable now */
|
||
|
cfg |= CR_CRYPEN;
|
||
|
|
||
|
stm32_cryp_write(cryp, CRYP_CR, cfg);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void stm32_cryp_finish_req(struct stm32_cryp *cryp)
|
||
|
{
|
||
|
int err = 0;
|
||
|
|
||
|
if (cryp->sgs_copied) {
|
||
|
void *buf_in, *buf_out;
|
||
|
int pages, len;
|
||
|
|
||
|
buf_in = sg_virt(&cryp->in_sgl);
|
||
|
buf_out = sg_virt(&cryp->out_sgl);
|
||
|
|
||
|
sg_copy_buf(buf_out, cryp->out_sg_save, 0,
|
||
|
cryp->total_out_save, 1);
|
||
|
|
||
|
len = ALIGN(cryp->total_in_save, cryp->hw_blocksize);
|
||
|
pages = len ? get_order(len) : 1;
|
||
|
free_pages((unsigned long)buf_in, pages);
|
||
|
|
||
|
len = ALIGN(cryp->total_out_save, cryp->hw_blocksize);
|
||
|
pages = len ? get_order(len) : 1;
|
||
|
free_pages((unsigned long)buf_out, pages);
|
||
|
}
|
||
|
|
||
|
crypto_finalize_cipher_request(cryp->engine, cryp->req, err);
|
||
|
cryp->req = NULL;
|
||
|
|
||
|
memset(cryp->ctx->key, 0, cryp->ctx->keylen);
|
||
|
|
||
|
mutex_unlock(&cryp->lock);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_cpu_start(struct stm32_cryp *cryp)
|
||
|
{
|
||
|
/* Enable interrupt and let the IRQ handler do everything */
|
||
|
stm32_cryp_write(cryp, CRYP_IMSCR, IMSCR_IN | IMSCR_OUT);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_cra_init(struct crypto_tfm *tfm)
|
||
|
{
|
||
|
tfm->crt_ablkcipher.reqsize = sizeof(struct stm32_cryp_reqctx);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_crypt(struct ablkcipher_request *req, unsigned long mode)
|
||
|
{
|
||
|
struct stm32_cryp_ctx *ctx = crypto_ablkcipher_ctx(
|
||
|
crypto_ablkcipher_reqtfm(req));
|
||
|
struct stm32_cryp_reqctx *rctx = ablkcipher_request_ctx(req);
|
||
|
struct stm32_cryp *cryp = stm32_cryp_find_dev(ctx);
|
||
|
|
||
|
if (!cryp)
|
||
|
return -ENODEV;
|
||
|
|
||
|
rctx->mode = mode;
|
||
|
|
||
|
return crypto_transfer_cipher_request_to_engine(cryp->engine, req);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
|
||
|
unsigned int keylen)
|
||
|
{
|
||
|
struct stm32_cryp_ctx *ctx = crypto_ablkcipher_ctx(tfm);
|
||
|
|
||
|
memcpy(ctx->key, key, keylen);
|
||
|
ctx->keylen = keylen;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
|
||
|
unsigned int keylen)
|
||
|
{
|
||
|
if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 &&
|
||
|
keylen != AES_KEYSIZE_256)
|
||
|
return -EINVAL;
|
||
|
else
|
||
|
return stm32_cryp_setkey(tfm, key, keylen);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_des_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
|
||
|
unsigned int keylen)
|
||
|
{
|
||
|
if (keylen != DES_KEY_SIZE)
|
||
|
return -EINVAL;
|
||
|
else
|
||
|
return stm32_cryp_setkey(tfm, key, keylen);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_tdes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
|
||
|
unsigned int keylen)
|
||
|
{
|
||
|
if (keylen != (3 * DES_KEY_SIZE))
|
||
|
return -EINVAL;
|
||
|
else
|
||
|
return stm32_cryp_setkey(tfm, key, keylen);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_aes_ecb_encrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_AES | FLG_ECB | FLG_ENCRYPT);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_aes_ecb_decrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_AES | FLG_ECB);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_aes_cbc_encrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_AES | FLG_CBC | FLG_ENCRYPT);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_aes_cbc_decrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_AES | FLG_CBC);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_aes_ctr_encrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_AES | FLG_CTR | FLG_ENCRYPT);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_aes_ctr_decrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_AES | FLG_CTR);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_des_ecb_encrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_DES | FLG_ECB | FLG_ENCRYPT);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_des_ecb_decrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_DES | FLG_ECB);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_des_cbc_encrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_DES | FLG_CBC | FLG_ENCRYPT);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_des_cbc_decrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_DES | FLG_CBC);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_tdes_ecb_encrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_TDES | FLG_ECB | FLG_ENCRYPT);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_tdes_ecb_decrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_TDES | FLG_ECB);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_tdes_cbc_encrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_TDES | FLG_CBC | FLG_ENCRYPT);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_tdes_cbc_decrypt(struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_crypt(req, FLG_TDES | FLG_CBC);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_prepare_req(struct crypto_engine *engine,
|
||
|
struct ablkcipher_request *req)
|
||
|
{
|
||
|
struct stm32_cryp_ctx *ctx;
|
||
|
struct stm32_cryp *cryp;
|
||
|
struct stm32_cryp_reqctx *rctx;
|
||
|
int ret;
|
||
|
|
||
|
if (!req)
|
||
|
return -EINVAL;
|
||
|
|
||
|
ctx = crypto_ablkcipher_ctx(crypto_ablkcipher_reqtfm(req));
|
||
|
|
||
|
cryp = ctx->cryp;
|
||
|
|
||
|
if (!cryp)
|
||
|
return -ENODEV;
|
||
|
|
||
|
mutex_lock(&cryp->lock);
|
||
|
|
||
|
rctx = ablkcipher_request_ctx(req);
|
||
|
rctx->mode &= FLG_MODE_MASK;
|
||
|
|
||
|
ctx->cryp = cryp;
|
||
|
|
||
|
cryp->flags = (cryp->flags & ~FLG_MODE_MASK) | rctx->mode;
|
||
|
cryp->hw_blocksize = is_aes(cryp) ? AES_BLOCK_SIZE : DES_BLOCK_SIZE;
|
||
|
cryp->ctx = ctx;
|
||
|
|
||
|
cryp->req = req;
|
||
|
cryp->total_in = req->nbytes;
|
||
|
cryp->total_out = cryp->total_in;
|
||
|
|
||
|
cryp->total_in_save = cryp->total_in;
|
||
|
cryp->total_out_save = cryp->total_out;
|
||
|
|
||
|
cryp->in_sg = req->src;
|
||
|
cryp->out_sg = req->dst;
|
||
|
cryp->out_sg_save = cryp->out_sg;
|
||
|
|
||
|
cryp->in_sg_len = sg_nents_for_len(cryp->in_sg, cryp->total_in);
|
||
|
if (cryp->in_sg_len < 0) {
|
||
|
dev_err(cryp->dev, "Cannot get in_sg_len\n");
|
||
|
ret = cryp->in_sg_len;
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
cryp->out_sg_len = sg_nents_for_len(cryp->out_sg, cryp->total_out);
|
||
|
if (cryp->out_sg_len < 0) {
|
||
|
dev_err(cryp->dev, "Cannot get out_sg_len\n");
|
||
|
ret = cryp->out_sg_len;
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
ret = stm32_cryp_copy_sgs(cryp);
|
||
|
if (ret)
|
||
|
goto out;
|
||
|
|
||
|
scatterwalk_start(&cryp->in_walk, cryp->in_sg);
|
||
|
scatterwalk_start(&cryp->out_walk, cryp->out_sg);
|
||
|
|
||
|
ret = stm32_cryp_hw_init(cryp);
|
||
|
out:
|
||
|
if (ret)
|
||
|
mutex_unlock(&cryp->lock);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_prepare_cipher_req(struct crypto_engine *engine,
|
||
|
struct ablkcipher_request *req)
|
||
|
{
|
||
|
return stm32_cryp_prepare_req(engine, req);
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_cipher_one_req(struct crypto_engine *engine,
|
||
|
struct ablkcipher_request *req)
|
||
|
{
|
||
|
struct stm32_cryp_ctx *ctx = crypto_ablkcipher_ctx(
|
||
|
crypto_ablkcipher_reqtfm(req));
|
||
|
struct stm32_cryp *cryp = ctx->cryp;
|
||
|
|
||
|
if (!cryp)
|
||
|
return -ENODEV;
|
||
|
|
||
|
return stm32_cryp_cpu_start(cryp);
|
||
|
}
|
||
|
|
||
|
static u32 *stm32_cryp_next_out(struct stm32_cryp *cryp, u32 *dst,
|
||
|
unsigned int n)
|
||
|
{
|
||
|
scatterwalk_advance(&cryp->out_walk, n);
|
||
|
|
||
|
if (unlikely(cryp->out_sg->length == _walked_out)) {
|
||
|
cryp->out_sg = sg_next(cryp->out_sg);
|
||
|
if (cryp->out_sg) {
|
||
|
scatterwalk_start(&cryp->out_walk, cryp->out_sg);
|
||
|
return (sg_virt(cryp->out_sg) + _walked_out);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return (u32 *)((u8 *)dst + n);
|
||
|
}
|
||
|
|
||
|
static u32 *stm32_cryp_next_in(struct stm32_cryp *cryp, u32 *src,
|
||
|
unsigned int n)
|
||
|
{
|
||
|
scatterwalk_advance(&cryp->in_walk, n);
|
||
|
|
||
|
if (unlikely(cryp->in_sg->length == _walked_in)) {
|
||
|
cryp->in_sg = sg_next(cryp->in_sg);
|
||
|
if (cryp->in_sg) {
|
||
|
scatterwalk_start(&cryp->in_walk, cryp->in_sg);
|
||
|
return (sg_virt(cryp->in_sg) + _walked_in);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return (u32 *)((u8 *)src + n);
|
||
|
}
|
||
|
|
||
|
static void stm32_cryp_check_ctr_counter(struct stm32_cryp *cryp)
|
||
|
{
|
||
|
u32 cr;
|
||
|
|
||
|
if (unlikely(cryp->last_ctr[3] == 0xFFFFFFFF)) {
|
||
|
cryp->last_ctr[3] = 0;
|
||
|
cryp->last_ctr[2]++;
|
||
|
if (!cryp->last_ctr[2]) {
|
||
|
cryp->last_ctr[1]++;
|
||
|
if (!cryp->last_ctr[1])
|
||
|
cryp->last_ctr[0]++;
|
||
|
}
|
||
|
|
||
|
cr = stm32_cryp_read(cryp, CRYP_CR);
|
||
|
stm32_cryp_write(cryp, CRYP_CR, cr & ~CR_CRYPEN);
|
||
|
|
||
|
stm32_cryp_hw_write_iv(cryp, (u32 *)cryp->last_ctr);
|
||
|
|
||
|
stm32_cryp_write(cryp, CRYP_CR, cr);
|
||
|
}
|
||
|
|
||
|
cryp->last_ctr[0] = stm32_cryp_read(cryp, CRYP_IV0LR);
|
||
|
cryp->last_ctr[1] = stm32_cryp_read(cryp, CRYP_IV0RR);
|
||
|
cryp->last_ctr[2] = stm32_cryp_read(cryp, CRYP_IV1LR);
|
||
|
cryp->last_ctr[3] = stm32_cryp_read(cryp, CRYP_IV1RR);
|
||
|
}
|
||
|
|
||
|
static bool stm32_cryp_irq_read_data(struct stm32_cryp *cryp)
|
||
|
{
|
||
|
unsigned int i, j;
|
||
|
u32 d32, *dst;
|
||
|
u8 *d8;
|
||
|
|
||
|
dst = sg_virt(cryp->out_sg) + _walked_out;
|
||
|
|
||
|
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++) {
|
||
|
if (likely(cryp->total_out >= sizeof(u32))) {
|
||
|
/* Read a full u32 */
|
||
|
*dst = stm32_cryp_read(cryp, CRYP_DOUT);
|
||
|
|
||
|
dst = stm32_cryp_next_out(cryp, dst, sizeof(u32));
|
||
|
cryp->total_out -= sizeof(u32);
|
||
|
} else if (!cryp->total_out) {
|
||
|
/* Empty fifo out (data from input padding) */
|
||
|
d32 = stm32_cryp_read(cryp, CRYP_DOUT);
|
||
|
} else {
|
||
|
/* Read less than an u32 */
|
||
|
d32 = stm32_cryp_read(cryp, CRYP_DOUT);
|
||
|
d8 = (u8 *)&d32;
|
||
|
|
||
|
for (j = 0; j < cryp->total_out; j++) {
|
||
|
*((u8 *)dst) = *(d8++);
|
||
|
dst = stm32_cryp_next_out(cryp, dst, 1);
|
||
|
}
|
||
|
cryp->total_out = 0;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return !cryp->total_out || !cryp->total_in;
|
||
|
}
|
||
|
|
||
|
static void stm32_cryp_irq_write_block(struct stm32_cryp *cryp)
|
||
|
{
|
||
|
unsigned int i, j;
|
||
|
u32 *src;
|
||
|
u8 d8[4];
|
||
|
|
||
|
src = sg_virt(cryp->in_sg) + _walked_in;
|
||
|
|
||
|
for (i = 0; i < cryp->hw_blocksize / sizeof(u32); i++) {
|
||
|
if (likely(cryp->total_in >= sizeof(u32))) {
|
||
|
/* Write a full u32 */
|
||
|
stm32_cryp_write(cryp, CRYP_DIN, *src);
|
||
|
|
||
|
src = stm32_cryp_next_in(cryp, src, sizeof(u32));
|
||
|
cryp->total_in -= sizeof(u32);
|
||
|
} else if (!cryp->total_in) {
|
||
|
/* Write padding data */
|
||
|
stm32_cryp_write(cryp, CRYP_DIN, 0);
|
||
|
} else {
|
||
|
/* Write less than an u32 */
|
||
|
memset(d8, 0, sizeof(u32));
|
||
|
for (j = 0; j < cryp->total_in; j++) {
|
||
|
d8[j] = *((u8 *)src);
|
||
|
src = stm32_cryp_next_in(cryp, src, 1);
|
||
|
}
|
||
|
|
||
|
stm32_cryp_write(cryp, CRYP_DIN, *(u32 *)d8);
|
||
|
cryp->total_in = 0;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void stm32_cryp_irq_write_data(struct stm32_cryp *cryp)
|
||
|
{
|
||
|
if (unlikely(!cryp->total_in)) {
|
||
|
dev_warn(cryp->dev, "No more data to process\n");
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
if (is_aes(cryp) && is_ctr(cryp))
|
||
|
stm32_cryp_check_ctr_counter(cryp);
|
||
|
|
||
|
stm32_cryp_irq_write_block(cryp);
|
||
|
}
|
||
|
|
||
|
static irqreturn_t stm32_cryp_irq_thread(int irq, void *arg)
|
||
|
{
|
||
|
struct stm32_cryp *cryp = arg;
|
||
|
|
||
|
if (cryp->irq_status & MISR_OUT)
|
||
|
/* Output FIFO IRQ: read data */
|
||
|
if (unlikely(stm32_cryp_irq_read_data(cryp))) {
|
||
|
/* All bytes processed, finish */
|
||
|
stm32_cryp_write(cryp, CRYP_IMSCR, 0);
|
||
|
stm32_cryp_finish_req(cryp);
|
||
|
return IRQ_HANDLED;
|
||
|
}
|
||
|
|
||
|
if (cryp->irq_status & MISR_IN) {
|
||
|
/* Input FIFO IRQ: write data */
|
||
|
stm32_cryp_irq_write_data(cryp);
|
||
|
}
|
||
|
|
||
|
return IRQ_HANDLED;
|
||
|
}
|
||
|
|
||
|
static irqreturn_t stm32_cryp_irq(int irq, void *arg)
|
||
|
{
|
||
|
struct stm32_cryp *cryp = arg;
|
||
|
|
||
|
cryp->irq_status = stm32_cryp_read(cryp, CRYP_MISR);
|
||
|
|
||
|
return IRQ_WAKE_THREAD;
|
||
|
}
|
||
|
|
||
|
static struct crypto_alg crypto_algs[] = {
|
||
|
{
|
||
|
.cra_name = "ecb(aes)",
|
||
|
.cra_driver_name = "stm32-ecb-aes",
|
||
|
.cra_priority = 200,
|
||
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
||
|
CRYPTO_ALG_ASYNC,
|
||
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
|
||
|
.cra_alignmask = 0xf,
|
||
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
.cra_module = THIS_MODULE,
|
||
|
.cra_init = stm32_cryp_cra_init,
|
||
|
.cra_ablkcipher = {
|
||
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
.setkey = stm32_cryp_aes_setkey,
|
||
|
.encrypt = stm32_cryp_aes_ecb_encrypt,
|
||
|
.decrypt = stm32_cryp_aes_ecb_decrypt,
|
||
|
}
|
||
|
},
|
||
|
{
|
||
|
.cra_name = "cbc(aes)",
|
||
|
.cra_driver_name = "stm32-cbc-aes",
|
||
|
.cra_priority = 200,
|
||
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
||
|
CRYPTO_ALG_ASYNC,
|
||
|
.cra_blocksize = AES_BLOCK_SIZE,
|
||
|
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
|
||
|
.cra_alignmask = 0xf,
|
||
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
.cra_module = THIS_MODULE,
|
||
|
.cra_init = stm32_cryp_cra_init,
|
||
|
.cra_ablkcipher = {
|
||
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
.setkey = stm32_cryp_aes_setkey,
|
||
|
.encrypt = stm32_cryp_aes_cbc_encrypt,
|
||
|
.decrypt = stm32_cryp_aes_cbc_decrypt,
|
||
|
}
|
||
|
},
|
||
|
{
|
||
|
.cra_name = "ctr(aes)",
|
||
|
.cra_driver_name = "stm32-ctr-aes",
|
||
|
.cra_priority = 200,
|
||
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
||
|
CRYPTO_ALG_ASYNC,
|
||
|
.cra_blocksize = 1,
|
||
|
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
|
||
|
.cra_alignmask = 0xf,
|
||
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
.cra_module = THIS_MODULE,
|
||
|
.cra_init = stm32_cryp_cra_init,
|
||
|
.cra_ablkcipher = {
|
||
|
.min_keysize = AES_MIN_KEY_SIZE,
|
||
|
.max_keysize = AES_MAX_KEY_SIZE,
|
||
|
.ivsize = AES_BLOCK_SIZE,
|
||
|
.setkey = stm32_cryp_aes_setkey,
|
||
|
.encrypt = stm32_cryp_aes_ctr_encrypt,
|
||
|
.decrypt = stm32_cryp_aes_ctr_decrypt,
|
||
|
}
|
||
|
},
|
||
|
{
|
||
|
.cra_name = "ecb(des)",
|
||
|
.cra_driver_name = "stm32-ecb-des",
|
||
|
.cra_priority = 200,
|
||
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
||
|
CRYPTO_ALG_ASYNC,
|
||
|
.cra_blocksize = DES_BLOCK_SIZE,
|
||
|
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
|
||
|
.cra_alignmask = 0xf,
|
||
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
.cra_module = THIS_MODULE,
|
||
|
.cra_init = stm32_cryp_cra_init,
|
||
|
.cra_ablkcipher = {
|
||
|
.min_keysize = DES_BLOCK_SIZE,
|
||
|
.max_keysize = DES_BLOCK_SIZE,
|
||
|
.setkey = stm32_cryp_des_setkey,
|
||
|
.encrypt = stm32_cryp_des_ecb_encrypt,
|
||
|
.decrypt = stm32_cryp_des_ecb_decrypt,
|
||
|
}
|
||
|
},
|
||
|
{
|
||
|
.cra_name = "cbc(des)",
|
||
|
.cra_driver_name = "stm32-cbc-des",
|
||
|
.cra_priority = 200,
|
||
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
||
|
CRYPTO_ALG_ASYNC,
|
||
|
.cra_blocksize = DES_BLOCK_SIZE,
|
||
|
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
|
||
|
.cra_alignmask = 0xf,
|
||
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
.cra_module = THIS_MODULE,
|
||
|
.cra_init = stm32_cryp_cra_init,
|
||
|
.cra_ablkcipher = {
|
||
|
.min_keysize = DES_BLOCK_SIZE,
|
||
|
.max_keysize = DES_BLOCK_SIZE,
|
||
|
.ivsize = DES_BLOCK_SIZE,
|
||
|
.setkey = stm32_cryp_des_setkey,
|
||
|
.encrypt = stm32_cryp_des_cbc_encrypt,
|
||
|
.decrypt = stm32_cryp_des_cbc_decrypt,
|
||
|
}
|
||
|
},
|
||
|
{
|
||
|
.cra_name = "ecb(des3_ede)",
|
||
|
.cra_driver_name = "stm32-ecb-des3",
|
||
|
.cra_priority = 200,
|
||
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
||
|
CRYPTO_ALG_ASYNC,
|
||
|
.cra_blocksize = DES_BLOCK_SIZE,
|
||
|
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
|
||
|
.cra_alignmask = 0xf,
|
||
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
.cra_module = THIS_MODULE,
|
||
|
.cra_init = stm32_cryp_cra_init,
|
||
|
.cra_ablkcipher = {
|
||
|
.min_keysize = 3 * DES_BLOCK_SIZE,
|
||
|
.max_keysize = 3 * DES_BLOCK_SIZE,
|
||
|
.setkey = stm32_cryp_tdes_setkey,
|
||
|
.encrypt = stm32_cryp_tdes_ecb_encrypt,
|
||
|
.decrypt = stm32_cryp_tdes_ecb_decrypt,
|
||
|
}
|
||
|
},
|
||
|
{
|
||
|
.cra_name = "cbc(des3_ede)",
|
||
|
.cra_driver_name = "stm32-cbc-des3",
|
||
|
.cra_priority = 200,
|
||
|
.cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER |
|
||
|
CRYPTO_ALG_ASYNC,
|
||
|
.cra_blocksize = DES_BLOCK_SIZE,
|
||
|
.cra_ctxsize = sizeof(struct stm32_cryp_ctx),
|
||
|
.cra_alignmask = 0xf,
|
||
|
.cra_type = &crypto_ablkcipher_type,
|
||
|
.cra_module = THIS_MODULE,
|
||
|
.cra_init = stm32_cryp_cra_init,
|
||
|
.cra_ablkcipher = {
|
||
|
.min_keysize = 3 * DES_BLOCK_SIZE,
|
||
|
.max_keysize = 3 * DES_BLOCK_SIZE,
|
||
|
.ivsize = DES_BLOCK_SIZE,
|
||
|
.setkey = stm32_cryp_tdes_setkey,
|
||
|
.encrypt = stm32_cryp_tdes_cbc_encrypt,
|
||
|
.decrypt = stm32_cryp_tdes_cbc_decrypt,
|
||
|
}
|
||
|
},
|
||
|
};
|
||
|
|
||
|
static const struct of_device_id stm32_dt_ids[] = {
|
||
|
{ .compatible = "st,stm32f756-cryp", },
|
||
|
{},
|
||
|
};
|
||
|
MODULE_DEVICE_TABLE(of, sti_dt_ids);
|
||
|
|
||
|
static int stm32_cryp_probe(struct platform_device *pdev)
|
||
|
{
|
||
|
struct device *dev = &pdev->dev;
|
||
|
struct stm32_cryp *cryp;
|
||
|
struct resource *res;
|
||
|
struct reset_control *rst;
|
||
|
int irq, ret;
|
||
|
|
||
|
cryp = devm_kzalloc(dev, sizeof(*cryp), GFP_KERNEL);
|
||
|
if (!cryp)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
cryp->dev = dev;
|
||
|
|
||
|
mutex_init(&cryp->lock);
|
||
|
|
||
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||
|
cryp->regs = devm_ioremap_resource(dev, res);
|
||
|
if (IS_ERR(cryp->regs)) {
|
||
|
dev_err(dev, "Cannot map CRYP IO\n");
|
||
|
return PTR_ERR(cryp->regs);
|
||
|
}
|
||
|
|
||
|
irq = platform_get_irq(pdev, 0);
|
||
|
if (irq < 0) {
|
||
|
dev_err(dev, "Cannot get IRQ resource\n");
|
||
|
return irq;
|
||
|
}
|
||
|
|
||
|
ret = devm_request_threaded_irq(dev, irq, stm32_cryp_irq,
|
||
|
stm32_cryp_irq_thread, IRQF_ONESHOT,
|
||
|
dev_name(dev), cryp);
|
||
|
if (ret) {
|
||
|
dev_err(dev, "Cannot grab IRQ\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
cryp->clk = devm_clk_get(dev, NULL);
|
||
|
if (IS_ERR(cryp->clk)) {
|
||
|
dev_err(dev, "Could not get clock\n");
|
||
|
return PTR_ERR(cryp->clk);
|
||
|
}
|
||
|
|
||
|
ret = clk_prepare_enable(cryp->clk);
|
||
|
if (ret) {
|
||
|
dev_err(cryp->dev, "Failed to enable clock\n");
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
rst = devm_reset_control_get(dev, NULL);
|
||
|
if (!IS_ERR(rst)) {
|
||
|
reset_control_assert(rst);
|
||
|
udelay(2);
|
||
|
reset_control_deassert(rst);
|
||
|
}
|
||
|
|
||
|
platform_set_drvdata(pdev, cryp);
|
||
|
|
||
|
spin_lock(&cryp_list.lock);
|
||
|
list_add(&cryp->list, &cryp_list.dev_list);
|
||
|
spin_unlock(&cryp_list.lock);
|
||
|
|
||
|
/* Initialize crypto engine */
|
||
|
cryp->engine = crypto_engine_alloc_init(dev, 1);
|
||
|
if (!cryp->engine) {
|
||
|
dev_err(dev, "Could not init crypto engine\n");
|
||
|
ret = -ENOMEM;
|
||
|
goto err_engine1;
|
||
|
}
|
||
|
|
||
|
cryp->engine->prepare_cipher_request = stm32_cryp_prepare_cipher_req;
|
||
|
cryp->engine->cipher_one_request = stm32_cryp_cipher_one_req;
|
||
|
|
||
|
ret = crypto_engine_start(cryp->engine);
|
||
|
if (ret) {
|
||
|
dev_err(dev, "Could not start crypto engine\n");
|
||
|
goto err_engine2;
|
||
|
}
|
||
|
|
||
|
ret = crypto_register_algs(crypto_algs, ARRAY_SIZE(crypto_algs));
|
||
|
if (ret) {
|
||
|
dev_err(dev, "Could not register algs\n");
|
||
|
goto err_algs;
|
||
|
}
|
||
|
|
||
|
dev_info(dev, "Initialized\n");
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
err_algs:
|
||
|
err_engine2:
|
||
|
crypto_engine_exit(cryp->engine);
|
||
|
err_engine1:
|
||
|
spin_lock(&cryp_list.lock);
|
||
|
list_del(&cryp->list);
|
||
|
spin_unlock(&cryp_list.lock);
|
||
|
|
||
|
clk_disable_unprepare(cryp->clk);
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
static int stm32_cryp_remove(struct platform_device *pdev)
|
||
|
{
|
||
|
struct stm32_cryp *cryp = platform_get_drvdata(pdev);
|
||
|
|
||
|
if (!cryp)
|
||
|
return -ENODEV;
|
||
|
|
||
|
crypto_unregister_algs(crypto_algs, ARRAY_SIZE(crypto_algs));
|
||
|
|
||
|
crypto_engine_exit(cryp->engine);
|
||
|
|
||
|
spin_lock(&cryp_list.lock);
|
||
|
list_del(&cryp->list);
|
||
|
spin_unlock(&cryp_list.lock);
|
||
|
|
||
|
clk_disable_unprepare(cryp->clk);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct platform_driver stm32_cryp_driver = {
|
||
|
.probe = stm32_cryp_probe,
|
||
|
.remove = stm32_cryp_remove,
|
||
|
.driver = {
|
||
|
.name = DRIVER_NAME,
|
||
|
.of_match_table = stm32_dt_ids,
|
||
|
},
|
||
|
};
|
||
|
|
||
|
module_platform_driver(stm32_cryp_driver);
|
||
|
|
||
|
MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
|
||
|
MODULE_DESCRIPTION("STMicrolectronics STM32 CRYP hardware driver");
|
||
|
MODULE_LICENSE("GPL");
|