diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/crypto/stm32/stm32-cryp.c | 2163 |
1 files changed, 2163 insertions, 0 deletions
diff --git a/drivers/crypto/stm32/stm32-cryp.c b/drivers/crypto/stm32/stm32-cryp.c new file mode 100644 index 0000000000..f095f00654 --- /dev/null +++ b/drivers/crypto/stm32/stm32-cryp.c @@ -0,0 +1,2163 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) STMicroelectronics SA 2017 + * Author: Fabien Dessenne <fabien.dessenne@st.com> + * Ux500 support taken from snippets in the old Ux500 cryp driver + */ + +#include <crypto/aes.h> +#include <crypto/engine.h> +#include <crypto/internal/aead.h> +#include <crypto/internal/des.h> +#include <crypto/internal/skcipher.h> +#include <crypto/scatterwalk.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/err.h> +#include <linux/iopoll.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> +#include <linux/reset.h> +#include <linux/string.h> + +#define DRIVER_NAME "stm32-cryp" + +/* Bit [0] encrypt / decrypt */ +#define FLG_ENCRYPT BIT(0) +/* Bit [8..1] algo & operation mode */ +#define FLG_AES BIT(1) +#define FLG_DES BIT(2) +#define FLG_TDES BIT(3) +#define FLG_ECB BIT(4) +#define FLG_CBC BIT(5) +#define FLG_CTR BIT(6) +#define FLG_GCM BIT(7) +#define FLG_CCM BIT(8) +/* Mode mask = bits [15..0] */ +#define FLG_MODE_MASK GENMASK(15, 0) +/* Bit [31..16] status */ + +/* Registers */ +#define CRYP_CR 0x00000000 +#define CRYP_SR 0x00000004 +#define CRYP_DIN 0x00000008 +#define CRYP_DOUT 0x0000000C +#define CRYP_DMACR 0x00000010 +#define CRYP_IMSCR 0x00000014 +#define CRYP_RISR 0x00000018 +#define CRYP_MISR 0x0000001C +#define CRYP_K0LR 0x00000020 +#define CRYP_K0RR 0x00000024 +#define CRYP_K1LR 0x00000028 +#define CRYP_K1RR 0x0000002C +#define CRYP_K2LR 0x00000030 +#define CRYP_K2RR 0x00000034 +#define CRYP_K3LR 0x00000038 +#define CRYP_K3RR 0x0000003C +#define CRYP_IV0LR 0x00000040 +#define CRYP_IV0RR 0x00000044 +#define CRYP_IV1LR 0x00000048 +#define CRYP_IV1RR 0x0000004C +#define CRYP_CSGCMCCM0R 0x00000050 +#define CRYP_CSGCM0R 0x00000070 + +#define UX500_CRYP_CR 0x00000000 +#define UX500_CRYP_SR 0x00000004 +#define UX500_CRYP_DIN 0x00000008 +#define UX500_CRYP_DINSIZE 0x0000000C +#define UX500_CRYP_DOUT 0x00000010 +#define UX500_CRYP_DOUSIZE 0x00000014 +#define UX500_CRYP_DMACR 0x00000018 +#define UX500_CRYP_IMSC 0x0000001C +#define UX500_CRYP_RIS 0x00000020 +#define UX500_CRYP_MIS 0x00000024 +#define UX500_CRYP_K1L 0x00000028 +#define UX500_CRYP_K1R 0x0000002C +#define UX500_CRYP_K2L 0x00000030 +#define UX500_CRYP_K2R 0x00000034 +#define UX500_CRYP_K3L 0x00000038 +#define UX500_CRYP_K3R 0x0000003C +#define UX500_CRYP_K4L 0x00000040 +#define UX500_CRYP_K4R 0x00000044 +#define UX500_CRYP_IV0L 0x00000048 +#define UX500_CRYP_IV0R 0x0000004C +#define UX500_CRYP_IV1L 0x00000050 +#define UX500_CRYP_IV1R 0x00000054 + +/* Registers values */ +#define CR_DEC_NOT_ENC 0x00000004 +#define CR_TDES_ECB 0x00000000 +#define CR_TDES_CBC 0x00000008 +#define CR_DES_ECB 0x00000010 +#define CR_DES_CBC 0x00000018 +#define CR_AES_ECB 0x00000020 +#define CR_AES_CBC 0x00000028 +#define CR_AES_CTR 0x00000030 +#define CR_AES_KP 0x00000038 /* Not on Ux500 */ +#define CR_AES_XTS 0x00000038 /* Only on Ux500 */ +#define CR_AES_GCM 0x00080000 +#define CR_AES_CCM 0x00080008 +#define CR_AES_UNKNOWN 0xFFFFFFFF +#define CR_ALGO_MASK 0x00080038 +#define CR_DATA32 0x00000000 +#define CR_DATA16 0x00000040 +#define CR_DATA8 0x00000080 +#define CR_DATA1 0x000000C0 +#define CR_KEY128 0x00000000 +#define CR_KEY192 0x00000100 +#define CR_KEY256 0x00000200 +#define CR_KEYRDEN 0x00000400 /* Only on Ux500 */ +#define CR_KSE 0x00000800 /* Only on Ux500 */ +#define CR_FFLUSH 0x00004000 +#define CR_CRYPEN 0x00008000 +#define CR_PH_INIT 0x00000000 +#define CR_PH_HEADER 0x00010000 +#define CR_PH_PAYLOAD 0x00020000 +#define CR_PH_FINAL 0x00030000 +#define CR_PH_MASK 0x00030000 +#define CR_NBPBL_SHIFT 20 + +#define SR_BUSY 0x00000010 +#define SR_OFNE 0x00000004 + +#define IMSCR_IN BIT(0) +#define IMSCR_OUT BIT(1) + +#define MISR_IN BIT(0) +#define MISR_OUT BIT(1) + +/* Misc */ +#define AES_BLOCK_32 (AES_BLOCK_SIZE / sizeof(u32)) +#define GCM_CTR_INIT 2 +#define CRYP_AUTOSUSPEND_DELAY 50 + +struct stm32_cryp_caps { + bool aeads_support; + bool linear_aes_key; + bool kp_mode; + bool iv_protection; + bool swap_final; + bool padding_wa; + u32 cr; + u32 sr; + u32 din; + u32 dout; + u32 imsc; + u32 mis; + u32 k1l; + u32 k1r; + u32 k3r; + u32 iv0l; + u32 iv0r; + u32 iv1l; + u32 iv1r; +}; + +struct stm32_cryp_ctx { + struct stm32_cryp *cryp; + int keylen; + __be32 key[AES_KEYSIZE_256 / sizeof(u32)]; + unsigned long flags; +}; + +struct stm32_cryp_reqctx { + unsigned long mode; +}; + +struct stm32_cryp { + struct list_head list; + struct device *dev; + void __iomem *regs; + struct clk *clk; + unsigned long flags; + u32 irq_status; + const struct stm32_cryp_caps *caps; + struct stm32_cryp_ctx *ctx; + + struct crypto_engine *engine; + + struct skcipher_request *req; + struct aead_request *areq; + + size_t authsize; + size_t hw_blocksize; + + size_t payload_in; + size_t header_in; + size_t payload_out; + + struct scatterlist *out_sg; + + struct scatter_walk in_walk; + struct scatter_walk out_walk; + + __be32 last_ctr[4]; + u32 gcm_ctr; +}; + +struct stm32_cryp_list { + struct list_head dev_list; + spinlock_t lock; /* protect dev_list */ +}; + +static struct stm32_cryp_list cryp_list = { + .dev_list = LIST_HEAD_INIT(cryp_list.dev_list), + .lock = __SPIN_LOCK_UNLOCKED(cryp_list.lock), +}; + +static inline bool is_aes(struct stm32_cryp *cryp) +{ + return cryp->flags & FLG_AES; +} + +static inline bool is_des(struct stm32_cryp *cryp) +{ + return cryp->flags & FLG_DES; +} + +static inline bool is_tdes(struct stm32_cryp *cryp) +{ + return cryp->flags & FLG_TDES; +} + +static inline bool is_ecb(struct stm32_cryp *cryp) +{ + return cryp->flags & FLG_ECB; +} + +static inline bool is_cbc(struct stm32_cryp *cryp) +{ + return cryp->flags & FLG_CBC; +} + +static inline bool is_ctr(struct stm32_cryp *cryp) +{ + return cryp->flags & FLG_CTR; +} + +static inline bool is_gcm(struct stm32_cryp *cryp) +{ + return cryp->flags & FLG_GCM; +} + +static inline bool is_ccm(struct stm32_cryp *cryp) +{ + return cryp->flags & FLG_CCM; +} + +static inline bool is_encrypt(struct stm32_cryp *cryp) +{ + return cryp->flags & FLG_ENCRYPT; +} + +static inline bool is_decrypt(struct stm32_cryp *cryp) +{ + return !is_encrypt(cryp); +} + +static inline u32 stm32_cryp_read(struct stm32_cryp *cryp, u32 ofst) +{ + return readl_relaxed(cryp->regs + ofst); +} + +static inline void stm32_cryp_write(struct stm32_cryp *cryp, u32 ofst, u32 val) +{ + writel_relaxed(val, cryp->regs + ofst); +} + +static inline int stm32_cryp_wait_busy(struct stm32_cryp *cryp) +{ + u32 status; + + return readl_relaxed_poll_timeout(cryp->regs + cryp->caps->sr, status, + !(status & SR_BUSY), 10, 100000); +} + +static inline void stm32_cryp_enable(struct stm32_cryp *cryp) +{ + writel_relaxed(readl_relaxed(cryp->regs + cryp->caps->cr) | CR_CRYPEN, + cryp->regs + cryp->caps->cr); +} + +static inline int stm32_cryp_wait_enable(struct stm32_cryp *cryp) +{ + u32 status; + + return readl_relaxed_poll_timeout(cryp->regs + cryp->caps->cr, status, + !(status & CR_CRYPEN), 10, 100000); +} + +static inline int stm32_cryp_wait_output(struct stm32_cryp *cryp) +{ + u32 status; + + return readl_relaxed_poll_timeout(cryp->regs + cryp->caps->sr, status, + status & SR_OFNE, 10, 100000); +} + +static inline void stm32_cryp_key_read_enable(struct stm32_cryp *cryp) +{ + writel_relaxed(readl_relaxed(cryp->regs + cryp->caps->cr) | CR_KEYRDEN, + cryp->regs + cryp->caps->cr); +} + +static inline void stm32_cryp_key_read_disable(struct stm32_cryp *cryp) +{ + writel_relaxed(readl_relaxed(cryp->regs + cryp->caps->cr) & ~CR_KEYRDEN, + cryp->regs + cryp->caps->cr); +} + +static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp); +static void stm32_cryp_finish_req(struct stm32_cryp *cryp, int err); + +static struct stm32_cryp *stm32_cryp_find_dev(struct stm32_cryp_ctx *ctx) +{ + struct stm32_cryp *tmp, *cryp = NULL; + + spin_lock_bh(&cryp_list.lock); + if (!ctx->cryp) { + list_for_each_entry(tmp, &cryp_list.dev_list, list) { + cryp = tmp; + break; + } + ctx->cryp = cryp; + } else { + cryp = ctx->cryp; + } + + spin_unlock_bh(&cryp_list.lock); + + return cryp; +} + +static void stm32_cryp_hw_write_iv(struct stm32_cryp *cryp, __be32 *iv) +{ + if (!iv) + return; + + stm32_cryp_write(cryp, cryp->caps->iv0l, be32_to_cpu(*iv++)); + stm32_cryp_write(cryp, cryp->caps->iv0r, be32_to_cpu(*iv++)); + + if (is_aes(cryp)) { + stm32_cryp_write(cryp, cryp->caps->iv1l, be32_to_cpu(*iv++)); + stm32_cryp_write(cryp, cryp->caps->iv1r, be32_to_cpu(*iv++)); + } +} + +static void stm32_cryp_get_iv(struct stm32_cryp *cryp) +{ + struct skcipher_request *req = cryp->req; + __be32 *tmp = (void *)req->iv; + + if (!tmp) + return; + + if (cryp->caps->iv_protection) + stm32_cryp_key_read_enable(cryp); + + *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv0l)); + *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv0r)); + + if (is_aes(cryp)) { + *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv1l)); + *tmp++ = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv1r)); + } + + if (cryp->caps->iv_protection) + stm32_cryp_key_read_disable(cryp); +} + +/** + * ux500_swap_bits_in_byte() - mirror the bits in a byte + * @b: the byte to be mirrored + * + * The bits are swapped the following way: + * Byte b include bits 0-7, nibble 1 (n1) include bits 0-3 and + * nibble 2 (n2) bits 4-7. + * + * Nibble 1 (n1): + * (The "old" (moved) bit is replaced with a zero) + * 1. Move bit 6 and 7, 4 positions to the left. + * 2. Move bit 3 and 5, 2 positions to the left. + * 3. Move bit 1-4, 1 position to the left. + * + * Nibble 2 (n2): + * 1. Move bit 0 and 1, 4 positions to the right. + * 2. Move bit 2 and 4, 2 positions to the right. + * 3. Move bit 3-6, 1 position to the right. + * + * Combine the two nibbles to a complete and swapped byte. + */ +static inline u8 ux500_swap_bits_in_byte(u8 b) +{ +#define R_SHIFT_4_MASK 0xc0 /* Bits 6 and 7, right shift 4 */ +#define R_SHIFT_2_MASK 0x28 /* (After right shift 4) Bits 3 and 5, + right shift 2 */ +#define R_SHIFT_1_MASK 0x1e /* (After right shift 2) Bits 1-4, + right shift 1 */ +#define L_SHIFT_4_MASK 0x03 /* Bits 0 and 1, left shift 4 */ +#define L_SHIFT_2_MASK 0x14 /* (After left shift 4) Bits 2 and 4, + left shift 2 */ +#define L_SHIFT_1_MASK 0x78 /* (After left shift 1) Bits 3-6, + left shift 1 */ + + u8 n1; + u8 n2; + + /* Swap most significant nibble */ + /* Right shift 4, bits 6 and 7 */ + n1 = ((b & R_SHIFT_4_MASK) >> 4) | (b & ~(R_SHIFT_4_MASK >> 4)); + /* Right shift 2, bits 3 and 5 */ + n1 = ((n1 & R_SHIFT_2_MASK) >> 2) | (n1 & ~(R_SHIFT_2_MASK >> 2)); + /* Right shift 1, bits 1-4 */ + n1 = (n1 & R_SHIFT_1_MASK) >> 1; + + /* Swap least significant nibble */ + /* Left shift 4, bits 0 and 1 */ + n2 = ((b & L_SHIFT_4_MASK) << 4) | (b & ~(L_SHIFT_4_MASK << 4)); + /* Left shift 2, bits 2 and 4 */ + n2 = ((n2 & L_SHIFT_2_MASK) << 2) | (n2 & ~(L_SHIFT_2_MASK << 2)); + /* Left shift 1, bits 3-6 */ + n2 = (n2 & L_SHIFT_1_MASK) << 1; + + return n1 | n2; +} + +/** + * ux500_swizzle_key() - Shuffle around words and bits in the AES key + * @in: key to swizzle + * @out: swizzled key + * @len: length of key, in bytes + * + * This "key swizzling procedure" is described in the examples in the + * DB8500 design specification. There is no real description of why + * the bits have been arranged like this in the hardware. + */ +static inline void ux500_swizzle_key(const u8 *in, u8 *out, u32 len) +{ + int i = 0; + int bpw = sizeof(u32); + int j; + int index = 0; + + j = len - bpw; + while (j >= 0) { + for (i = 0; i < bpw; i++) { + index = len - j - bpw + i; + out[j + i] = + ux500_swap_bits_in_byte(in[index]); + } + j -= bpw; + } +} + +static void stm32_cryp_hw_write_key(struct stm32_cryp *c) +{ + unsigned int i; + int r_id; + + if (is_des(c)) { + stm32_cryp_write(c, c->caps->k1l, be32_to_cpu(c->ctx->key[0])); + stm32_cryp_write(c, c->caps->k1r, be32_to_cpu(c->ctx->key[1])); + return; + } + + /* + * On the Ux500 the AES key is considered as a single bit sequence + * of 128, 192 or 256 bits length. It is written linearly into the + * registers from K1L and down, and need to be processed to become + * a proper big-endian bit sequence. + */ + if (is_aes(c) && c->caps->linear_aes_key) { + u32 tmpkey[8]; + + ux500_swizzle_key((u8 *)c->ctx->key, + (u8 *)tmpkey, c->ctx->keylen); + + r_id = c->caps->k1l; + for (i = 0; i < c->ctx->keylen / sizeof(u32); i++, r_id += 4) + stm32_cryp_write(c, r_id, tmpkey[i]); + + return; + } + + r_id = c->caps->k3r; + for (i = c->ctx->keylen / sizeof(u32); i > 0; i--, r_id -= 4) + stm32_cryp_write(c, r_id, be32_to_cpu(c->ctx->key[i - 1])); +} + +static u32 stm32_cryp_get_hw_mode(struct stm32_cryp *cryp) +{ + if (is_aes(cryp) && is_ecb(cryp)) + return CR_AES_ECB; + + if (is_aes(cryp) && is_cbc(cryp)) + return CR_AES_CBC; + + if (is_aes(cryp) && is_ctr(cryp)) + return CR_AES_CTR; + + if (is_aes(cryp) && is_gcm(cryp)) + return CR_AES_GCM; + + if (is_aes(cryp) && is_ccm(cryp)) + return CR_AES_CCM; + + if (is_des(cryp) && is_ecb(cryp)) + return CR_DES_ECB; + + if (is_des(cryp) && is_cbc(cryp)) + return CR_DES_CBC; + + if (is_tdes(cryp) && is_ecb(cryp)) + return CR_TDES_ECB; + + if (is_tdes(cryp) && is_cbc(cryp)) + return CR_TDES_CBC; + + dev_err(cryp->dev, "Unknown mode\n"); + return CR_AES_UNKNOWN; +} + +static unsigned int stm32_cryp_get_input_text_len(struct stm32_cryp *cryp) +{ + return is_encrypt(cryp) ? cryp->areq->cryptlen : + cryp->areq->cryptlen - cryp->authsize; +} + +static int stm32_cryp_gcm_init(struct stm32_cryp *cryp, u32 cfg) +{ + int ret; + __be32 iv[4]; + + /* Phase 1 : init */ + memcpy(iv, cryp->areq->iv, 12); + iv[3] = cpu_to_be32(GCM_CTR_INIT); + cryp->gcm_ctr = GCM_CTR_INIT; + stm32_cryp_hw_write_iv(cryp, iv); + + stm32_cryp_write(cryp, cryp->caps->cr, cfg | CR_PH_INIT | CR_CRYPEN); + + /* Wait for end of processing */ + ret = stm32_cryp_wait_enable(cryp); + if (ret) { + dev_err(cryp->dev, "Timeout (gcm init)\n"); + return ret; + } + + /* Prepare next phase */ + if (cryp->areq->assoclen) { + cfg |= CR_PH_HEADER; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + } else if (stm32_cryp_get_input_text_len(cryp)) { + cfg |= CR_PH_PAYLOAD; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + } + + return 0; +} + +static void stm32_crypt_gcmccm_end_header(struct stm32_cryp *cryp) +{ + u32 cfg; + int err; + + /* Check if whole header written */ + if (!cryp->header_in) { + /* Wait for completion */ + err = stm32_cryp_wait_busy(cryp); + if (err) { + dev_err(cryp->dev, "Timeout (gcm/ccm header)\n"); + stm32_cryp_write(cryp, cryp->caps->imsc, 0); + stm32_cryp_finish_req(cryp, err); + return; + } + + if (stm32_cryp_get_input_text_len(cryp)) { + /* Phase 3 : payload */ + cfg = stm32_cryp_read(cryp, cryp->caps->cr); + cfg &= ~CR_CRYPEN; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + cfg &= ~CR_PH_MASK; + cfg |= CR_PH_PAYLOAD | CR_CRYPEN; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + } else { + /* + * Phase 4 : tag. + * Nothing to read, nothing to write, caller have to + * end request + */ + } + } +} + +static void stm32_cryp_write_ccm_first_header(struct stm32_cryp *cryp) +{ + size_t written; + size_t len; + u32 alen = cryp->areq->assoclen; + u32 block[AES_BLOCK_32] = {0}; + u8 *b8 = (u8 *)block; + + if (alen <= 65280) { + /* Write first u32 of B1 */ + b8[0] = (alen >> 8) & 0xFF; + b8[1] = alen & 0xFF; + len = 2; + } else { + /* Build the two first u32 of B1 */ + b8[0] = 0xFF; + b8[1] = 0xFE; + b8[2] = (alen & 0xFF000000) >> 24; + b8[3] = (alen & 0x00FF0000) >> 16; + b8[4] = (alen & 0x0000FF00) >> 8; + b8[5] = alen & 0x000000FF; + len = 6; + } + + written = min_t(size_t, AES_BLOCK_SIZE - len, alen); + + scatterwalk_copychunks((char *)block + len, &cryp->in_walk, written, 0); + + writesl(cryp->regs + cryp->caps->din, block, AES_BLOCK_32); + + cryp->header_in -= written; + + stm32_crypt_gcmccm_end_header(cryp); +} + +static int stm32_cryp_ccm_init(struct stm32_cryp *cryp, u32 cfg) +{ + int ret; + u32 iv_32[AES_BLOCK_32], b0_32[AES_BLOCK_32]; + u8 *iv = (u8 *)iv_32, *b0 = (u8 *)b0_32; + __be32 *bd; + u32 *d; + unsigned int i, textlen; + + /* Phase 1 : init. Firstly set the CTR value to 1 (not 0) */ + memcpy(iv, cryp->areq->iv, AES_BLOCK_SIZE); + memset(iv + AES_BLOCK_SIZE - 1 - iv[0], 0, iv[0] + 1); + iv[AES_BLOCK_SIZE - 1] = 1; + stm32_cryp_hw_write_iv(cryp, (__be32 *)iv); + + /* Build B0 */ + memcpy(b0, iv, AES_BLOCK_SIZE); + + b0[0] |= (8 * ((cryp->authsize - 2) / 2)); + + if (cryp->areq->assoclen) + b0[0] |= 0x40; + + textlen = stm32_cryp_get_input_text_len(cryp); + + b0[AES_BLOCK_SIZE - 2] = textlen >> 8; + b0[AES_BLOCK_SIZE - 1] = textlen & 0xFF; + + /* Enable HW */ + stm32_cryp_write(cryp, cryp->caps->cr, cfg | CR_PH_INIT | CR_CRYPEN); + + /* Write B0 */ + d = (u32 *)b0; + bd = (__be32 *)b0; + + for (i = 0; i < AES_BLOCK_32; i++) { + u32 xd = d[i]; + + if (!cryp->caps->padding_wa) + xd = be32_to_cpu(bd[i]); + stm32_cryp_write(cryp, cryp->caps->din, xd); + } + + /* Wait for end of processing */ + ret = stm32_cryp_wait_enable(cryp); + if (ret) { + dev_err(cryp->dev, "Timeout (ccm init)\n"); + return ret; + } + + /* Prepare next phase */ + if (cryp->areq->assoclen) { + cfg |= CR_PH_HEADER | CR_CRYPEN; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + /* Write first (special) block (may move to next phase [payload]) */ + stm32_cryp_write_ccm_first_header(cryp); + } else if (stm32_cryp_get_input_text_len(cryp)) { + cfg |= CR_PH_PAYLOAD; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + } + + return 0; +} + +static int stm32_cryp_hw_init(struct stm32_cryp *cryp) +{ + int ret; + u32 cfg, hw_mode; + + pm_runtime_get_sync(cryp->dev); + + /* Disable interrupt */ + stm32_cryp_write(cryp, cryp->caps->imsc, 0); + + /* Set configuration */ + cfg = CR_DATA8 | CR_FFLUSH; + + switch (cryp->ctx->keylen) { + case AES_KEYSIZE_128: + cfg |= CR_KEY128; + break; + + case AES_KEYSIZE_192: + cfg |= CR_KEY192; + break; + + default: + case AES_KEYSIZE_256: + cfg |= CR_KEY256; + break; + } + + hw_mode = stm32_cryp_get_hw_mode(cryp); + if (hw_mode == CR_AES_UNKNOWN) + return -EINVAL; + + /* AES ECB/CBC decrypt: run key preparation first */ + if (is_decrypt(cryp) && + ((hw_mode == CR_AES_ECB) || (hw_mode == CR_AES_CBC))) { + /* Configure in key preparation mode */ + if (cryp->caps->kp_mode) + stm32_cryp_write(cryp, cryp->caps->cr, + cfg | CR_AES_KP); + else + stm32_cryp_write(cryp, + cryp->caps->cr, cfg | CR_AES_ECB | CR_KSE); + + /* Set key only after full configuration done */ + stm32_cryp_hw_write_key(cryp); + + /* Start prepare key */ + stm32_cryp_enable(cryp); + /* Wait for end of processing */ + ret = stm32_cryp_wait_busy(cryp); + if (ret) { + dev_err(cryp->dev, "Timeout (key preparation)\n"); + return ret; + } + + cfg |= hw_mode | CR_DEC_NOT_ENC; + + /* Apply updated config (Decrypt + algo) and flush */ + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + } else { + cfg |= hw_mode; + if (is_decrypt(cryp)) + cfg |= CR_DEC_NOT_ENC; + + /* Apply config and flush */ + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + /* Set key only after configuration done */ + stm32_cryp_hw_write_key(cryp); + } + + switch (hw_mode) { + case CR_AES_GCM: + case CR_AES_CCM: + /* Phase 1 : init */ + if (hw_mode == CR_AES_CCM) + ret = stm32_cryp_ccm_init(cryp, cfg); + else + ret = stm32_cryp_gcm_init(cryp, cfg); + + if (ret) + return ret; + + break; + + case CR_DES_CBC: + case CR_TDES_CBC: + case CR_AES_CBC: + case CR_AES_CTR: + stm32_cryp_hw_write_iv(cryp, (__be32 *)cryp->req->iv); + break; + + default: + break; + } + + /* Enable now */ + stm32_cryp_enable(cryp); + + return 0; +} + +static void stm32_cryp_finish_req(struct stm32_cryp *cryp, int err) +{ + if (!err && (is_gcm(cryp) || is_ccm(cryp))) + /* Phase 4 : output tag */ + err = stm32_cryp_read_auth_tag(cryp); + + if (!err && (!(is_gcm(cryp) || is_ccm(cryp) || is_ecb(cryp)))) + stm32_cryp_get_iv(cryp); + + pm_runtime_mark_last_busy(cryp->dev); + pm_runtime_put_autosuspend(cryp->dev); + + if (is_gcm(cryp) || is_ccm(cryp)) + crypto_finalize_aead_request(cryp->engine, cryp->areq, err); + else + crypto_finalize_skcipher_request(cryp->engine, cryp->req, + err); +} + +static int stm32_cryp_cpu_start(struct stm32_cryp *cryp) +{ + /* Enable interrupt and let the IRQ handler do everything */ + stm32_cryp_write(cryp, cryp->caps->imsc, IMSCR_IN | IMSCR_OUT); + + return 0; +} + +static int stm32_cryp_cipher_one_req(struct crypto_engine *engine, void *areq); + +static int stm32_cryp_init_tfm(struct crypto_skcipher *tfm) +{ + crypto_skcipher_set_reqsize(tfm, sizeof(struct stm32_cryp_reqctx)); + + return 0; +} + +static int stm32_cryp_aead_one_req(struct crypto_engine *engine, void *areq); + +static int stm32_cryp_aes_aead_init(struct crypto_aead *tfm) +{ + tfm->reqsize = sizeof(struct stm32_cryp_reqctx); + + return 0; +} + +static int stm32_cryp_crypt(struct skcipher_request *req, unsigned long mode) +{ + struct stm32_cryp_ctx *ctx = crypto_skcipher_ctx( + crypto_skcipher_reqtfm(req)); + struct stm32_cryp_reqctx *rctx = skcipher_request_ctx(req); + struct stm32_cryp *cryp = stm32_cryp_find_dev(ctx); + + if (!cryp) + return -ENODEV; + + rctx->mode = mode; + + return crypto_transfer_skcipher_request_to_engine(cryp->engine, req); +} + +static int stm32_cryp_aead_crypt(struct aead_request *req, unsigned long mode) +{ + struct stm32_cryp_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); + struct stm32_cryp_reqctx *rctx = aead_request_ctx(req); + struct stm32_cryp *cryp = stm32_cryp_find_dev(ctx); + + if (!cryp) + return -ENODEV; + + rctx->mode = mode; + + return crypto_transfer_aead_request_to_engine(cryp->engine, req); +} + +static int stm32_cryp_setkey(struct crypto_skcipher *tfm, const u8 *key, + unsigned int keylen) +{ + struct stm32_cryp_ctx *ctx = crypto_skcipher_ctx(tfm); + + memcpy(ctx->key, key, keylen); + ctx->keylen = keylen; + + return 0; +} + +static int stm32_cryp_aes_setkey(struct crypto_skcipher *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_skcipher *tfm, const u8 *key, + unsigned int keylen) +{ + return verify_skcipher_des_key(tfm, key) ?: + stm32_cryp_setkey(tfm, key, keylen); +} + +static int stm32_cryp_tdes_setkey(struct crypto_skcipher *tfm, const u8 *key, + unsigned int keylen) +{ + return verify_skcipher_des3_key(tfm, key) ?: + stm32_cryp_setkey(tfm, key, keylen); +} + +static int stm32_cryp_aes_aead_setkey(struct crypto_aead *tfm, const u8 *key, + unsigned int keylen) +{ + struct stm32_cryp_ctx *ctx = crypto_aead_ctx(tfm); + + if (keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_192 && + keylen != AES_KEYSIZE_256) + return -EINVAL; + + memcpy(ctx->key, key, keylen); + ctx->keylen = keylen; + + return 0; +} + +static int stm32_cryp_aes_gcm_setauthsize(struct crypto_aead *tfm, + unsigned int authsize) +{ + switch (authsize) { + case 4: + case 8: + case 12: + case 13: + case 14: + case 15: + case 16: + break; + default: + return -EINVAL; + } + + return 0; +} + +static int stm32_cryp_aes_ccm_setauthsize(struct crypto_aead *tfm, + unsigned int authsize) +{ + switch (authsize) { + case 4: + case 6: + case 8: + case 10: + case 12: + case 14: + case 16: + break; + default: + return -EINVAL; + } + + return 0; +} + +static int stm32_cryp_aes_ecb_encrypt(struct skcipher_request *req) +{ + if (req->cryptlen % AES_BLOCK_SIZE) + return -EINVAL; + + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_AES | FLG_ECB | FLG_ENCRYPT); +} + +static int stm32_cryp_aes_ecb_decrypt(struct skcipher_request *req) +{ + if (req->cryptlen % AES_BLOCK_SIZE) + return -EINVAL; + + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_AES | FLG_ECB); +} + +static int stm32_cryp_aes_cbc_encrypt(struct skcipher_request *req) +{ + if (req->cryptlen % AES_BLOCK_SIZE) + return -EINVAL; + + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_AES | FLG_CBC | FLG_ENCRYPT); +} + +static int stm32_cryp_aes_cbc_decrypt(struct skcipher_request *req) +{ + if (req->cryptlen % AES_BLOCK_SIZE) + return -EINVAL; + + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_AES | FLG_CBC); +} + +static int stm32_cryp_aes_ctr_encrypt(struct skcipher_request *req) +{ + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_AES | FLG_CTR | FLG_ENCRYPT); +} + +static int stm32_cryp_aes_ctr_decrypt(struct skcipher_request *req) +{ + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_AES | FLG_CTR); +} + +static int stm32_cryp_aes_gcm_encrypt(struct aead_request *req) +{ + return stm32_cryp_aead_crypt(req, FLG_AES | FLG_GCM | FLG_ENCRYPT); +} + +static int stm32_cryp_aes_gcm_decrypt(struct aead_request *req) +{ + return stm32_cryp_aead_crypt(req, FLG_AES | FLG_GCM); +} + +static inline int crypto_ccm_check_iv(const u8 *iv) +{ + /* 2 <= L <= 8, so 1 <= L' <= 7. */ + if (iv[0] < 1 || iv[0] > 7) + return -EINVAL; + + return 0; +} + +static int stm32_cryp_aes_ccm_encrypt(struct aead_request *req) +{ + int err; + + err = crypto_ccm_check_iv(req->iv); + if (err) + return err; + + return stm32_cryp_aead_crypt(req, FLG_AES | FLG_CCM | FLG_ENCRYPT); +} + +static int stm32_cryp_aes_ccm_decrypt(struct aead_request *req) +{ + int err; + + err = crypto_ccm_check_iv(req->iv); + if (err) + return err; + + return stm32_cryp_aead_crypt(req, FLG_AES | FLG_CCM); +} + +static int stm32_cryp_des_ecb_encrypt(struct skcipher_request *req) +{ + if (req->cryptlen % DES_BLOCK_SIZE) + return -EINVAL; + + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_DES | FLG_ECB | FLG_ENCRYPT); +} + +static int stm32_cryp_des_ecb_decrypt(struct skcipher_request *req) +{ + if (req->cryptlen % DES_BLOCK_SIZE) + return -EINVAL; + + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_DES | FLG_ECB); +} + +static int stm32_cryp_des_cbc_encrypt(struct skcipher_request *req) +{ + if (req->cryptlen % DES_BLOCK_SIZE) + return -EINVAL; + + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_DES | FLG_CBC | FLG_ENCRYPT); +} + +static int stm32_cryp_des_cbc_decrypt(struct skcipher_request *req) +{ + if (req->cryptlen % DES_BLOCK_SIZE) + return -EINVAL; + + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_DES | FLG_CBC); +} + +static int stm32_cryp_tdes_ecb_encrypt(struct skcipher_request *req) +{ + if (req->cryptlen % DES_BLOCK_SIZE) + return -EINVAL; + + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_TDES | FLG_ECB | FLG_ENCRYPT); +} + +static int stm32_cryp_tdes_ecb_decrypt(struct skcipher_request *req) +{ + if (req->cryptlen % DES_BLOCK_SIZE) + return -EINVAL; + + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_TDES | FLG_ECB); +} + +static int stm32_cryp_tdes_cbc_encrypt(struct skcipher_request *req) +{ + if (req->cryptlen % DES_BLOCK_SIZE) + return -EINVAL; + + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_TDES | FLG_CBC | FLG_ENCRYPT); +} + +static int stm32_cryp_tdes_cbc_decrypt(struct skcipher_request *req) +{ + if (req->cryptlen % DES_BLOCK_SIZE) + return -EINVAL; + + if (req->cryptlen == 0) + return 0; + + return stm32_cryp_crypt(req, FLG_TDES | FLG_CBC); +} + +static int stm32_cryp_prepare_req(struct skcipher_request *req, + struct aead_request *areq) +{ + struct stm32_cryp_ctx *ctx; + struct stm32_cryp *cryp; + struct stm32_cryp_reqctx *rctx; + struct scatterlist *in_sg; + int ret; + + if (!req && !areq) + return -EINVAL; + + ctx = req ? crypto_skcipher_ctx(crypto_skcipher_reqtfm(req)) : + crypto_aead_ctx(crypto_aead_reqtfm(areq)); + + cryp = ctx->cryp; + + rctx = req ? skcipher_request_ctx(req) : aead_request_ctx(areq); + 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; + + if (req) { + cryp->req = req; + cryp->areq = NULL; + cryp->header_in = 0; + cryp->payload_in = req->cryptlen; + cryp->payload_out = req->cryptlen; + cryp->authsize = 0; + } else { + /* + * Length of input and output data: + * Encryption case: + * INPUT = AssocData || PlainText + * <- assoclen -> <- cryptlen -> + * + * OUTPUT = AssocData || CipherText || AuthTag + * <- assoclen -> <-- cryptlen --> <- authsize -> + * + * Decryption case: + * INPUT = AssocData || CipherTex || AuthTag + * <- assoclen ---> <---------- cryptlen ----------> + * + * OUTPUT = AssocData || PlainText + * <- assoclen -> <- cryptlen - authsize -> + */ + cryp->areq = areq; + cryp->req = NULL; + cryp->authsize = crypto_aead_authsize(crypto_aead_reqtfm(areq)); + if (is_encrypt(cryp)) { + cryp->payload_in = areq->cryptlen; + cryp->header_in = areq->assoclen; + cryp->payload_out = areq->cryptlen; + } else { + cryp->payload_in = areq->cryptlen - cryp->authsize; + cryp->header_in = areq->assoclen; + cryp->payload_out = cryp->payload_in; + } + } + + in_sg = req ? req->src : areq->src; + scatterwalk_start(&cryp->in_walk, in_sg); + + cryp->out_sg = req ? req->dst : areq->dst; + scatterwalk_start(&cryp->out_walk, cryp->out_sg); + + if (is_gcm(cryp) || is_ccm(cryp)) { + /* In output, jump after assoc data */ + scatterwalk_copychunks(NULL, &cryp->out_walk, cryp->areq->assoclen, 2); + } + + if (is_ctr(cryp)) + memset(cryp->last_ctr, 0, sizeof(cryp->last_ctr)); + + ret = stm32_cryp_hw_init(cryp); + return ret; +} + +static int stm32_cryp_cipher_one_req(struct crypto_engine *engine, void *areq) +{ + struct skcipher_request *req = container_of(areq, + struct skcipher_request, + base); + struct stm32_cryp_ctx *ctx = crypto_skcipher_ctx( + crypto_skcipher_reqtfm(req)); + struct stm32_cryp *cryp = ctx->cryp; + + if (!cryp) + return -ENODEV; + + return stm32_cryp_prepare_req(req, NULL) ?: + stm32_cryp_cpu_start(cryp); +} + +static int stm32_cryp_aead_one_req(struct crypto_engine *engine, void *areq) +{ + struct aead_request *req = container_of(areq, struct aead_request, + base); + struct stm32_cryp_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); + struct stm32_cryp *cryp = ctx->cryp; + int err; + + if (!cryp) + return -ENODEV; + + err = stm32_cryp_prepare_req(NULL, req); + if (err) + return err; + + if (unlikely(!cryp->payload_in && !cryp->header_in)) { + /* No input data to process: get tag and finish */ + stm32_cryp_finish_req(cryp, 0); + return 0; + } + + return stm32_cryp_cpu_start(cryp); +} + +static int stm32_cryp_read_auth_tag(struct stm32_cryp *cryp) +{ + u32 cfg, size_bit; + unsigned int i; + int ret = 0; + + /* Update Config */ + cfg = stm32_cryp_read(cryp, cryp->caps->cr); + + cfg &= ~CR_PH_MASK; + cfg |= CR_PH_FINAL; + cfg &= ~CR_DEC_NOT_ENC; + cfg |= CR_CRYPEN; + + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + if (is_gcm(cryp)) { + /* GCM: write aad and payload size (in bits) */ + size_bit = cryp->areq->assoclen * 8; + if (cryp->caps->swap_final) + size_bit = (__force u32)cpu_to_be32(size_bit); + + stm32_cryp_write(cryp, cryp->caps->din, 0); + stm32_cryp_write(cryp, cryp->caps->din, size_bit); + + size_bit = is_encrypt(cryp) ? cryp->areq->cryptlen : + cryp->areq->cryptlen - cryp->authsize; + size_bit *= 8; + if (cryp->caps->swap_final) + size_bit = (__force u32)cpu_to_be32(size_bit); + + stm32_cryp_write(cryp, cryp->caps->din, 0); + stm32_cryp_write(cryp, cryp->caps->din, size_bit); + } else { + /* CCM: write CTR0 */ + u32 iv32[AES_BLOCK_32]; + u8 *iv = (u8 *)iv32; + __be32 *biv = (__be32 *)iv32; + + memcpy(iv, cryp->areq->iv, AES_BLOCK_SIZE); + memset(iv + AES_BLOCK_SIZE - 1 - iv[0], 0, iv[0] + 1); + + for (i = 0; i < AES_BLOCK_32; i++) { + u32 xiv = iv32[i]; + + if (!cryp->caps->padding_wa) + xiv = be32_to_cpu(biv[i]); + stm32_cryp_write(cryp, cryp->caps->din, xiv); + } + } + + /* Wait for output data */ + ret = stm32_cryp_wait_output(cryp); + if (ret) { + dev_err(cryp->dev, "Timeout (read tag)\n"); + return ret; + } + + if (is_encrypt(cryp)) { + u32 out_tag[AES_BLOCK_32]; + + /* Get and write tag */ + readsl(cryp->regs + cryp->caps->dout, out_tag, AES_BLOCK_32); + scatterwalk_copychunks(out_tag, &cryp->out_walk, cryp->authsize, 1); + } else { + /* Get and check tag */ + u32 in_tag[AES_BLOCK_32], out_tag[AES_BLOCK_32]; + + scatterwalk_copychunks(in_tag, &cryp->in_walk, cryp->authsize, 0); + readsl(cryp->regs + cryp->caps->dout, out_tag, AES_BLOCK_32); + + if (crypto_memneq(in_tag, out_tag, cryp->authsize)) + ret = -EBADMSG; + } + + /* Disable cryp */ + cfg &= ~CR_CRYPEN; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + return ret; +} + +static void stm32_cryp_check_ctr_counter(struct stm32_cryp *cryp) +{ + u32 cr; + + if (unlikely(cryp->last_ctr[3] == cpu_to_be32(0xFFFFFFFF))) { + /* + * In this case, we need to increment manually the ctr counter, + * as HW doesn't handle the U32 carry. + */ + crypto_inc((u8 *)cryp->last_ctr, sizeof(cryp->last_ctr)); + + cr = stm32_cryp_read(cryp, cryp->caps->cr); + stm32_cryp_write(cryp, cryp->caps->cr, cr & ~CR_CRYPEN); + + stm32_cryp_hw_write_iv(cryp, cryp->last_ctr); + + stm32_cryp_write(cryp, cryp->caps->cr, cr); + } + + /* The IV registers are BE */ + cryp->last_ctr[0] = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv0l)); + cryp->last_ctr[1] = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv0r)); + cryp->last_ctr[2] = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv1l)); + cryp->last_ctr[3] = cpu_to_be32(stm32_cryp_read(cryp, cryp->caps->iv1r)); +} + +static void stm32_cryp_irq_read_data(struct stm32_cryp *cryp) +{ + u32 block[AES_BLOCK_32]; + + readsl(cryp->regs + cryp->caps->dout, block, cryp->hw_blocksize / sizeof(u32)); + scatterwalk_copychunks(block, &cryp->out_walk, min_t(size_t, cryp->hw_blocksize, + cryp->payload_out), 1); + cryp->payload_out -= min_t(size_t, cryp->hw_blocksize, + cryp->payload_out); +} + +static void stm32_cryp_irq_write_block(struct stm32_cryp *cryp) +{ + u32 block[AES_BLOCK_32] = {0}; + + scatterwalk_copychunks(block, &cryp->in_walk, min_t(size_t, cryp->hw_blocksize, + cryp->payload_in), 0); + writesl(cryp->regs + cryp->caps->din, block, cryp->hw_blocksize / sizeof(u32)); + cryp->payload_in -= min_t(size_t, cryp->hw_blocksize, cryp->payload_in); +} + +static void stm32_cryp_irq_write_gcm_padded_data(struct stm32_cryp *cryp) +{ + int err; + u32 cfg, block[AES_BLOCK_32] = {0}; + unsigned int i; + + /* 'Special workaround' procedure described in the datasheet */ + + /* a) disable ip */ + stm32_cryp_write(cryp, cryp->caps->imsc, 0); + cfg = stm32_cryp_read(cryp, cryp->caps->cr); + cfg &= ~CR_CRYPEN; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + /* b) Update IV1R */ + stm32_cryp_write(cryp, cryp->caps->iv1r, cryp->gcm_ctr - 2); + + /* c) change mode to CTR */ + cfg &= ~CR_ALGO_MASK; + cfg |= CR_AES_CTR; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + /* a) enable IP */ + cfg |= CR_CRYPEN; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + /* b) pad and write the last block */ + stm32_cryp_irq_write_block(cryp); + /* wait end of process */ + err = stm32_cryp_wait_output(cryp); + if (err) { + dev_err(cryp->dev, "Timeout (write gcm last data)\n"); + return stm32_cryp_finish_req(cryp, err); + } + + /* c) get and store encrypted data */ + /* + * Same code as stm32_cryp_irq_read_data(), but we want to store + * block value + */ + readsl(cryp->regs + cryp->caps->dout, block, cryp->hw_blocksize / sizeof(u32)); + + scatterwalk_copychunks(block, &cryp->out_walk, min_t(size_t, cryp->hw_blocksize, + cryp->payload_out), 1); + cryp->payload_out -= min_t(size_t, cryp->hw_blocksize, + cryp->payload_out); + + /* d) change mode back to AES GCM */ + cfg &= ~CR_ALGO_MASK; + cfg |= CR_AES_GCM; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + /* e) change phase to Final */ + cfg &= ~CR_PH_MASK; + cfg |= CR_PH_FINAL; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + /* f) write padded data */ + writesl(cryp->regs + cryp->caps->din, block, AES_BLOCK_32); + + /* g) Empty fifo out */ + err = stm32_cryp_wait_output(cryp); + if (err) { + dev_err(cryp->dev, "Timeout (write gcm padded data)\n"); + return stm32_cryp_finish_req(cryp, err); + } + + for (i = 0; i < AES_BLOCK_32; i++) + stm32_cryp_read(cryp, cryp->caps->dout); + + /* h) run the he normal Final phase */ + stm32_cryp_finish_req(cryp, 0); +} + +static void stm32_cryp_irq_set_npblb(struct stm32_cryp *cryp) +{ + u32 cfg; + + /* disable ip, set NPBLB and reneable ip */ + cfg = stm32_cryp_read(cryp, cryp->caps->cr); + cfg &= ~CR_CRYPEN; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + cfg |= (cryp->hw_blocksize - cryp->payload_in) << CR_NBPBL_SHIFT; + cfg |= CR_CRYPEN; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); +} + +static void stm32_cryp_irq_write_ccm_padded_data(struct stm32_cryp *cryp) +{ + int err = 0; + u32 cfg, iv1tmp; + u32 cstmp1[AES_BLOCK_32], cstmp2[AES_BLOCK_32]; + u32 block[AES_BLOCK_32] = {0}; + unsigned int i; + + /* 'Special workaround' procedure described in the datasheet */ + + /* a) disable ip */ + stm32_cryp_write(cryp, cryp->caps->imsc, 0); + + cfg = stm32_cryp_read(cryp, cryp->caps->cr); + cfg &= ~CR_CRYPEN; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + /* b) get IV1 from CRYP_CSGCMCCM7 */ + iv1tmp = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + 7 * 4); + + /* c) Load CRYP_CSGCMCCMxR */ + for (i = 0; i < ARRAY_SIZE(cstmp1); i++) + cstmp1[i] = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + i * 4); + + /* d) Write IV1R */ + stm32_cryp_write(cryp, cryp->caps->iv1r, iv1tmp); + + /* e) change mode to CTR */ + cfg &= ~CR_ALGO_MASK; + cfg |= CR_AES_CTR; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + /* a) enable IP */ + cfg |= CR_CRYPEN; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + /* b) pad and write the last block */ + stm32_cryp_irq_write_block(cryp); + /* wait end of process */ + err = stm32_cryp_wait_output(cryp); + if (err) { + dev_err(cryp->dev, "Timeout (write ccm padded data)\n"); + return stm32_cryp_finish_req(cryp, err); + } + + /* c) get and store decrypted data */ + /* + * Same code as stm32_cryp_irq_read_data(), but we want to store + * block value + */ + readsl(cryp->regs + cryp->caps->dout, block, cryp->hw_blocksize / sizeof(u32)); + + scatterwalk_copychunks(block, &cryp->out_walk, min_t(size_t, cryp->hw_blocksize, + cryp->payload_out), 1); + cryp->payload_out -= min_t(size_t, cryp->hw_blocksize, cryp->payload_out); + + /* d) Load again CRYP_CSGCMCCMxR */ + for (i = 0; i < ARRAY_SIZE(cstmp2); i++) + cstmp2[i] = stm32_cryp_read(cryp, CRYP_CSGCMCCM0R + i * 4); + + /* e) change mode back to AES CCM */ + cfg &= ~CR_ALGO_MASK; + cfg |= CR_AES_CCM; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + /* f) change phase to header */ + cfg &= ~CR_PH_MASK; + cfg |= CR_PH_HEADER; + stm32_cryp_write(cryp, cryp->caps->cr, cfg); + + /* g) XOR and write padded data */ + for (i = 0; i < ARRAY_SIZE(block); i++) { + block[i] ^= cstmp1[i]; + block[i] ^= cstmp2[i]; + stm32_cryp_write(cryp, cryp->caps->din, block[i]); + } + + /* h) wait for completion */ + err = stm32_cryp_wait_busy(cryp); + if (err) + dev_err(cryp->dev, "Timeout (write ccm padded data)\n"); + + /* i) run the he normal Final phase */ + stm32_cryp_finish_req(cryp, err); +} + +static void stm32_cryp_irq_write_data(struct stm32_cryp *cryp) +{ + if (unlikely(!cryp->payload_in)) { + dev_warn(cryp->dev, "No more data to process\n"); + return; + } + + if (unlikely(cryp->payload_in < AES_BLOCK_SIZE && + (stm32_cryp_get_hw_mode(cryp) == CR_AES_GCM) && + is_encrypt(cryp))) { + /* Padding for AES GCM encryption */ + if (cryp->caps->padding_wa) { + /* Special case 1 */ + stm32_cryp_irq_write_gcm_padded_data(cryp); + return; + } + + /* Setting padding bytes (NBBLB) */ + stm32_cryp_irq_set_npblb(cryp); + } + + if (unlikely((cryp->payload_in < AES_BLOCK_SIZE) && + (stm32_cryp_get_hw_mode(cryp) == CR_AES_CCM) && + is_decrypt(cryp))) { + /* Padding for AES CCM decryption */ + if (cryp->caps->padding_wa) { + /* Special case 2 */ + stm32_cryp_irq_write_ccm_padded_data(cryp); + return; + } + + /* Setting padding bytes (NBBLB) */ + stm32_cryp_irq_set_npblb(cryp); + } + + if (is_aes(cryp) && is_ctr(cryp)) + stm32_cryp_check_ctr_counter(cryp); + + stm32_cryp_irq_write_block(cryp); +} + +static void stm32_cryp_irq_write_gcmccm_header(struct stm32_cryp *cryp) +{ + u32 block[AES_BLOCK_32] = {0}; + size_t written; + + written = min_t(size_t, AES_BLOCK_SIZE, cryp->header_in); + + scatterwalk_copychunks(block, &cryp->in_walk, written, 0); + + writesl(cryp->regs + cryp->caps->din, block, AES_BLOCK_32); + + cryp->header_in -= written; + + stm32_crypt_gcmccm_end_header(cryp); +} + +static irqreturn_t stm32_cryp_irq_thread(int irq, void *arg) +{ + struct stm32_cryp *cryp = arg; + u32 ph; + u32 it_mask = stm32_cryp_read(cryp, cryp->caps->imsc); + + if (cryp->irq_status & MISR_OUT) + /* Output FIFO IRQ: read data */ + stm32_cryp_irq_read_data(cryp); + + if (cryp->irq_status & MISR_IN) { + if (is_gcm(cryp) || is_ccm(cryp)) { + ph = stm32_cryp_read(cryp, cryp->caps->cr) & CR_PH_MASK; + if (unlikely(ph == CR_PH_HEADER)) + /* Write Header */ + stm32_cryp_irq_write_gcmccm_header(cryp); + else + /* Input FIFO IRQ: write data */ + stm32_cryp_irq_write_data(cryp); + if (is_gcm(cryp)) + cryp->gcm_ctr++; + } else { + /* Input FIFO IRQ: write data */ + stm32_cryp_irq_write_data(cryp); + } + } + + /* Mask useless interrupts */ + if (!cryp->payload_in && !cryp->header_in) + it_mask &= ~IMSCR_IN; + if (!cryp->payload_out) + it_mask &= ~IMSCR_OUT; + stm32_cryp_write(cryp, cryp->caps->imsc, it_mask); + + if (!cryp->payload_in && !cryp->header_in && !cryp->payload_out) + stm32_cryp_finish_req(cryp, 0); + + 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->caps->mis); + + return IRQ_WAKE_THREAD; +} + +static struct skcipher_engine_alg crypto_algs[] = { +{ + .base = { + .base.cra_name = "ecb(aes)", + .base.cra_driver_name = "stm32-ecb-aes", + .base.cra_priority = 200, + .base.cra_flags = CRYPTO_ALG_ASYNC, + .base.cra_blocksize = AES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx), + .base.cra_alignmask = 0, + .base.cra_module = THIS_MODULE, + + .init = stm32_cryp_init_tfm, + .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, + }, + .op = { + .do_one_request = stm32_cryp_cipher_one_req, + }, +}, +{ + .base = { + .base.cra_name = "cbc(aes)", + .base.cra_driver_name = "stm32-cbc-aes", + .base.cra_priority = 200, + .base.cra_flags = CRYPTO_ALG_ASYNC, + .base.cra_blocksize = AES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx), + .base.cra_alignmask = 0, + .base.cra_module = THIS_MODULE, + + .init = stm32_cryp_init_tfm, + .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, + }, + .op = { + .do_one_request = stm32_cryp_cipher_one_req, + }, +}, +{ + .base = { + .base.cra_name = "ctr(aes)", + .base.cra_driver_name = "stm32-ctr-aes", + .base.cra_priority = 200, + .base.cra_flags = CRYPTO_ALG_ASYNC, + .base.cra_blocksize = 1, + .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx), + .base.cra_alignmask = 0, + .base.cra_module = THIS_MODULE, + + .init = stm32_cryp_init_tfm, + .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, + }, + .op = { + .do_one_request = stm32_cryp_cipher_one_req, + }, +}, +{ + .base = { + .base.cra_name = "ecb(des)", + .base.cra_driver_name = "stm32-ecb-des", + .base.cra_priority = 200, + .base.cra_flags = CRYPTO_ALG_ASYNC, + .base.cra_blocksize = DES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx), + .base.cra_alignmask = 0, + .base.cra_module = THIS_MODULE, + + .init = stm32_cryp_init_tfm, + .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, + }, + .op = { + .do_one_request = stm32_cryp_cipher_one_req, + }, +}, +{ + .base = { + .base.cra_name = "cbc(des)", + .base.cra_driver_name = "stm32-cbc-des", + .base.cra_priority = 200, + .base.cra_flags = CRYPTO_ALG_ASYNC, + .base.cra_blocksize = DES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx), + .base.cra_alignmask = 0, + .base.cra_module = THIS_MODULE, + + .init = stm32_cryp_init_tfm, + .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, + }, + .op = { + .do_one_request = stm32_cryp_cipher_one_req, + }, +}, +{ + .base = { + .base.cra_name = "ecb(des3_ede)", + .base.cra_driver_name = "stm32-ecb-des3", + .base.cra_priority = 200, + .base.cra_flags = CRYPTO_ALG_ASYNC, + .base.cra_blocksize = DES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx), + .base.cra_alignmask = 0, + .base.cra_module = THIS_MODULE, + + .init = stm32_cryp_init_tfm, + .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, + }, + .op = { + .do_one_request = stm32_cryp_cipher_one_req, + }, +}, +{ + .base = { + .base.cra_name = "cbc(des3_ede)", + .base.cra_driver_name = "stm32-cbc-des3", + .base.cra_priority = 200, + .base.cra_flags = CRYPTO_ALG_ASYNC, + .base.cra_blocksize = DES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct stm32_cryp_ctx), + .base.cra_alignmask = 0, + .base.cra_module = THIS_MODULE, + + .init = stm32_cryp_init_tfm, + .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, + }, + .op = { + .do_one_request = stm32_cryp_cipher_one_req, + }, +}, +}; + +static struct aead_engine_alg aead_algs[] = { +{ + .base.setkey = stm32_cryp_aes_aead_setkey, + .base.setauthsize = stm32_cryp_aes_gcm_setauthsize, + .base.encrypt = stm32_cryp_aes_gcm_encrypt, + .base.decrypt = stm32_cryp_aes_gcm_decrypt, + .base.init = stm32_cryp_aes_aead_init, + .base.ivsize = 12, + .base.maxauthsize = AES_BLOCK_SIZE, + + .base.base = { + .cra_name = "gcm(aes)", + .cra_driver_name = "stm32-gcm-aes", + .cra_priority = 200, + .cra_flags = CRYPTO_ALG_ASYNC, + .cra_blocksize = 1, + .cra_ctxsize = sizeof(struct stm32_cryp_ctx), + .cra_alignmask = 0, + .cra_module = THIS_MODULE, + }, + .op = { + .do_one_request = stm32_cryp_aead_one_req, + }, +}, +{ + .base.setkey = stm32_cryp_aes_aead_setkey, + .base.setauthsize = stm32_cryp_aes_ccm_setauthsize, + .base.encrypt = stm32_cryp_aes_ccm_encrypt, + .base.decrypt = stm32_cryp_aes_ccm_decrypt, + .base.init = stm32_cryp_aes_aead_init, + .base.ivsize = AES_BLOCK_SIZE, + .base.maxauthsize = AES_BLOCK_SIZE, + + .base.base = { + .cra_name = "ccm(aes)", + .cra_driver_name = "stm32-ccm-aes", + .cra_priority = 200, + .cra_flags = CRYPTO_ALG_ASYNC, + .cra_blocksize = 1, + .cra_ctxsize = sizeof(struct stm32_cryp_ctx), + .cra_alignmask = 0, + .cra_module = THIS_MODULE, + }, + .op = { + .do_one_request = stm32_cryp_aead_one_req, + }, +}, +}; + +static const struct stm32_cryp_caps ux500_data = { + .aeads_support = false, + .linear_aes_key = true, + .kp_mode = false, + .iv_protection = true, + .swap_final = true, + .padding_wa = true, + .cr = UX500_CRYP_CR, + .sr = UX500_CRYP_SR, + .din = UX500_CRYP_DIN, + .dout = UX500_CRYP_DOUT, + .imsc = UX500_CRYP_IMSC, + .mis = UX500_CRYP_MIS, + .k1l = UX500_CRYP_K1L, + .k1r = UX500_CRYP_K1R, + .k3r = UX500_CRYP_K3R, + .iv0l = UX500_CRYP_IV0L, + .iv0r = UX500_CRYP_IV0R, + .iv1l = UX500_CRYP_IV1L, + .iv1r = UX500_CRYP_IV1R, +}; + +static const struct stm32_cryp_caps f7_data = { + .aeads_support = true, + .linear_aes_key = false, + .kp_mode = true, + .iv_protection = false, + .swap_final = true, + .padding_wa = true, + .cr = CRYP_CR, + .sr = CRYP_SR, + .din = CRYP_DIN, + .dout = CRYP_DOUT, + .imsc = CRYP_IMSCR, + .mis = CRYP_MISR, + .k1l = CRYP_K1LR, + .k1r = CRYP_K1RR, + .k3r = CRYP_K3RR, + .iv0l = CRYP_IV0LR, + .iv0r = CRYP_IV0RR, + .iv1l = CRYP_IV1LR, + .iv1r = CRYP_IV1RR, +}; + +static const struct stm32_cryp_caps mp1_data = { + .aeads_support = true, + .linear_aes_key = false, + .kp_mode = true, + .iv_protection = false, + .swap_final = false, + .padding_wa = false, + .cr = CRYP_CR, + .sr = CRYP_SR, + .din = CRYP_DIN, + .dout = CRYP_DOUT, + .imsc = CRYP_IMSCR, + .mis = CRYP_MISR, + .k1l = CRYP_K1LR, + .k1r = CRYP_K1RR, + .k3r = CRYP_K3RR, + .iv0l = CRYP_IV0LR, + .iv0r = CRYP_IV0RR, + .iv1l = CRYP_IV1LR, + .iv1r = CRYP_IV1RR, +}; + +static const struct of_device_id stm32_dt_ids[] = { + { .compatible = "stericsson,ux500-cryp", .data = &ux500_data}, + { .compatible = "st,stm32f756-cryp", .data = &f7_data}, + { .compatible = "st,stm32mp1-cryp", .data = &mp1_data}, + {}, +}; +MODULE_DEVICE_TABLE(of, stm32_dt_ids); + +static int stm32_cryp_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct stm32_cryp *cryp; + struct reset_control *rst; + int irq, ret; + + cryp = devm_kzalloc(dev, sizeof(*cryp), GFP_KERNEL); + if (!cryp) + return -ENOMEM; + + cryp->caps = of_device_get_match_data(dev); + if (!cryp->caps) + return -ENODEV; + + cryp->dev = dev; + + cryp->regs = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(cryp->regs)) + return PTR_ERR(cryp->regs); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + 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_probe(dev, PTR_ERR(cryp->clk), "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; + } + + pm_runtime_set_autosuspend_delay(dev, CRYP_AUTOSUSPEND_DELAY); + pm_runtime_use_autosuspend(dev); + + pm_runtime_get_noresume(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + + rst = devm_reset_control_get(dev, NULL); + if (IS_ERR(rst)) { + ret = PTR_ERR(rst); + if (ret == -EPROBE_DEFER) + goto err_rst; + } else { + 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; + } + + ret = crypto_engine_start(cryp->engine); + if (ret) { + dev_err(dev, "Could not start crypto engine\n"); + goto err_engine2; + } + + ret = crypto_engine_register_skciphers(crypto_algs, ARRAY_SIZE(crypto_algs)); + if (ret) { + dev_err(dev, "Could not register algs\n"); + goto err_algs; + } + + if (cryp->caps->aeads_support) { + ret = crypto_engine_register_aeads(aead_algs, ARRAY_SIZE(aead_algs)); + if (ret) + goto err_aead_algs; + } + + dev_info(dev, "Initialized\n"); + + pm_runtime_put_sync(dev); + + return 0; + +err_aead_algs: + crypto_engine_unregister_skciphers(crypto_algs, ARRAY_SIZE(crypto_algs)); +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); +err_rst: + pm_runtime_disable(dev); + pm_runtime_put_noidle(dev); + + clk_disable_unprepare(cryp->clk); + + return ret; +} + +static int stm32_cryp_remove(struct platform_device *pdev) +{ + struct stm32_cryp *cryp = platform_get_drvdata(pdev); + int ret; + + if (!cryp) + return -ENODEV; + + ret = pm_runtime_resume_and_get(cryp->dev); + if (ret < 0) + return ret; + + if (cryp->caps->aeads_support) + crypto_engine_unregister_aeads(aead_algs, ARRAY_SIZE(aead_algs)); + crypto_engine_unregister_skciphers(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); + + pm_runtime_disable(cryp->dev); + pm_runtime_put_noidle(cryp->dev); + + clk_disable_unprepare(cryp->clk); + + return 0; +} + +#ifdef CONFIG_PM +static int stm32_cryp_runtime_suspend(struct device *dev) +{ + struct stm32_cryp *cryp = dev_get_drvdata(dev); + + clk_disable_unprepare(cryp->clk); + + return 0; +} + +static int stm32_cryp_runtime_resume(struct device *dev) +{ + struct stm32_cryp *cryp = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(cryp->clk); + if (ret) { + dev_err(cryp->dev, "Failed to prepare_enable clock\n"); + return ret; + } + + return 0; +} +#endif + +static const struct dev_pm_ops stm32_cryp_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) + SET_RUNTIME_PM_OPS(stm32_cryp_runtime_suspend, + stm32_cryp_runtime_resume, NULL) +}; + +static struct platform_driver stm32_cryp_driver = { + .probe = stm32_cryp_probe, + .remove = stm32_cryp_remove, + .driver = { + .name = DRIVER_NAME, + .pm = &stm32_cryp_pm_ops, + .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"); |