diff options
Diffstat (limited to 'drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c')
| -rw-r--r-- | drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c new file mode 100644 index 000000000..cfde9ee43 --- /dev/null +++ b/drivers/crypto/allwinner/sun8i-ce/sun8i-ce-prng.c @@ -0,0 +1,164 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * sun8i-ce-prng.c - hardware cryptographic offloader for + * Allwinner H3/A64/H5/H2+/H6/R40 SoC + * + * Copyright (C) 2015-2020 Corentin Labbe <clabbe@baylibre.com> + * + * This file handle the PRNG + * + * You could find a link for the datasheet in Documentation/arm/sunxi.rst + */ +#include "sun8i-ce.h" +#include <linux/dma-mapping.h> +#include <linux/pm_runtime.h> +#include <crypto/internal/rng.h> + +int sun8i_ce_prng_init(struct crypto_tfm *tfm) +{ + struct sun8i_ce_rng_tfm_ctx *ctx = crypto_tfm_ctx(tfm); + + memset(ctx, 0, sizeof(struct sun8i_ce_rng_tfm_ctx)); + return 0; +} + +void sun8i_ce_prng_exit(struct crypto_tfm *tfm) +{ + struct sun8i_ce_rng_tfm_ctx *ctx = crypto_tfm_ctx(tfm); + + memzero_explicit(ctx->seed, ctx->slen); + kfree(ctx->seed); + ctx->seed = NULL; + ctx->slen = 0; +} + +int sun8i_ce_prng_seed(struct crypto_rng *tfm, const u8 *seed, + unsigned int slen) +{ + struct sun8i_ce_rng_tfm_ctx *ctx = crypto_rng_ctx(tfm); + + if (ctx->seed && ctx->slen != slen) { + memzero_explicit(ctx->seed, ctx->slen); + kfree(ctx->seed); + ctx->slen = 0; + ctx->seed = NULL; + } + if (!ctx->seed) + ctx->seed = kmalloc(slen, GFP_KERNEL | GFP_DMA); + if (!ctx->seed) + return -ENOMEM; + + memcpy(ctx->seed, seed, slen); + ctx->slen = slen; + + return 0; +} + +int sun8i_ce_prng_generate(struct crypto_rng *tfm, const u8 *src, + unsigned int slen, u8 *dst, unsigned int dlen) +{ + struct sun8i_ce_rng_tfm_ctx *ctx = crypto_rng_ctx(tfm); + struct rng_alg *alg = crypto_rng_alg(tfm); + struct sun8i_ce_alg_template *algt; + struct sun8i_ce_dev *ce; + dma_addr_t dma_iv, dma_dst; + int err = 0; + int flow = 3; + unsigned int todo; + struct sun8i_ce_flow *chan; + struct ce_task *cet; + u32 common, sym; + void *d; + + algt = container_of(alg, struct sun8i_ce_alg_template, alg.rng); + ce = algt->ce; + + if (ctx->slen == 0) { + dev_err(ce->dev, "not seeded\n"); + return -EINVAL; + } + + /* we want dlen + seedsize rounded up to a multiple of PRNG_DATA_SIZE */ + todo = dlen + ctx->slen + PRNG_DATA_SIZE * 2; + todo -= todo % PRNG_DATA_SIZE; + + d = kzalloc(todo, GFP_KERNEL | GFP_DMA); + if (!d) { + err = -ENOMEM; + goto err_mem; + } + + dev_dbg(ce->dev, "%s PRNG slen=%u dlen=%u todo=%u multi=%u\n", __func__, + slen, dlen, todo, todo / PRNG_DATA_SIZE); + +#ifdef CONFIG_CRYPTO_DEV_SUN8I_CE_DEBUG + algt->stat_req++; + algt->stat_bytes += todo; +#endif + + dma_iv = dma_map_single(ce->dev, ctx->seed, ctx->slen, DMA_TO_DEVICE); + if (dma_mapping_error(ce->dev, dma_iv)) { + dev_err(ce->dev, "Cannot DMA MAP IV\n"); + goto err_iv; + } + + dma_dst = dma_map_single(ce->dev, d, todo, DMA_FROM_DEVICE); + if (dma_mapping_error(ce->dev, dma_dst)) { + dev_err(ce->dev, "Cannot DMA MAP DST\n"); + err = -EFAULT; + goto err_dst; + } + + err = pm_runtime_get_sync(ce->dev); + if (err < 0) { + pm_runtime_put_noidle(ce->dev); + goto err_pm; + } + + mutex_lock(&ce->rnglock); + chan = &ce->chanlist[flow]; + + cet = &chan->tl[0]; + memset(cet, 0, sizeof(struct ce_task)); + + cet->t_id = cpu_to_le32(flow); + common = ce->variant->prng | CE_COMM_INT; + cet->t_common_ctl = cpu_to_le32(common); + + /* recent CE (H6) need length in bytes, in word otherwise */ + if (ce->variant->prng_t_dlen_in_bytes) + cet->t_dlen = cpu_to_le32(todo); + else + cet->t_dlen = cpu_to_le32(todo / 4); + + sym = PRNG_LD; + cet->t_sym_ctl = cpu_to_le32(sym); + cet->t_asym_ctl = 0; + + cet->t_key = cpu_to_le32(dma_iv); + cet->t_iv = cpu_to_le32(dma_iv); + + cet->t_dst[0].addr = cpu_to_le32(dma_dst); + cet->t_dst[0].len = cpu_to_le32(todo / 4); + ce->chanlist[flow].timeout = 2000; + + err = sun8i_ce_run_task(ce, 3, "PRNG"); + mutex_unlock(&ce->rnglock); + + pm_runtime_put(ce->dev); + +err_pm: + dma_unmap_single(ce->dev, dma_dst, todo, DMA_FROM_DEVICE); +err_dst: + dma_unmap_single(ce->dev, dma_iv, ctx->slen, DMA_TO_DEVICE); + + if (!err) { + memcpy(dst, d, dlen); + memcpy(ctx->seed, d + dlen, ctx->slen); + } + memzero_explicit(d, todo); +err_iv: + kfree(d); +err_mem: + return err; +} |