diff options
Diffstat (limited to 'drivers/crypto/xilinx/xilinx-trng.c')
| -rw-r--r-- | drivers/crypto/xilinx/xilinx-trng.c | 85 |
1 files changed, 4 insertions, 81 deletions
diff --git a/drivers/crypto/xilinx/xilinx-trng.c b/drivers/crypto/xilinx/xilinx-trng.c index 5276ac2d82bb..e3ced111c409 100644 --- a/drivers/crypto/xilinx/xilinx-trng.c +++ b/drivers/crypto/xilinx/xilinx-trng.c @@ -6,7 +6,6 @@ #include <linux/bitfield.h> #include <linux/clk.h> -#include <linux/crypto.h> #include <linux/delay.h> #include <linux/firmware/xlnx-zynqmp.h> #include <linux/hw_random.h> @@ -14,14 +13,12 @@ #include <linux/iopoll.h> #include <linux/kernel.h> #include <linux/module.h> -#include <linux/mutex.h> #include <linux/mod_devicetable.h> #include <linux/platform_device.h> #include <crypto/aes.h> #include <crypto/df_sp80090a.h> #include <crypto/internal/drbg.h> #include <crypto/internal/cipher.h> -#include <crypto/internal/rng.h> /* TRNG Registers Offsets */ #define TRNG_STATUS_OFFSET 0x4U @@ -61,16 +58,9 @@ struct xilinx_rng { struct device *dev; unsigned char *scratchpadbuf; struct aes_enckey *aeskey; - struct mutex lock; /* Protect access to TRNG device */ struct hwrng trng; }; -struct xilinx_rng_ctx { - struct xilinx_rng *rng; -}; - -static struct xilinx_rng *xilinx_rng_dev; - static void xtrng_readwrite32(void __iomem *addr, u32 mask, u8 value) { u32 val; @@ -246,47 +236,6 @@ static int xtrng_random_bytes_generate(struct xilinx_rng *rng, u8 *rand_buf_ptr, return nbytes; } -static int xtrng_trng_generate(struct crypto_rng *tfm, const u8 *src, u32 slen, - u8 *dst, u32 dlen) -{ - struct xilinx_rng_ctx *ctx = crypto_rng_ctx(tfm); - int ret; - - mutex_lock(&ctx->rng->lock); - ret = xtrng_random_bytes_generate(ctx->rng, dst, dlen, true); - mutex_unlock(&ctx->rng->lock); - - return ret < 0 ? ret : 0; -} - -static int xtrng_trng_seed(struct crypto_rng *tfm, const u8 *seed, unsigned int slen) -{ - return 0; -} - -static int xtrng_trng_init(struct crypto_tfm *rtfm) -{ - struct xilinx_rng_ctx *ctx = crypto_tfm_ctx(rtfm); - - ctx->rng = xilinx_rng_dev; - - return 0; -} - -static struct rng_alg xtrng_trng_alg = { - .generate = xtrng_trng_generate, - .seed = xtrng_trng_seed, - .seedsize = 0, - .base = { - .cra_name = "stdrng", - .cra_driver_name = "xilinx-trng", - .cra_priority = 300, - .cra_ctxsize = sizeof(struct xilinx_rng_ctx), - .cra_module = THIS_MODULE, - .cra_init = xtrng_trng_init, - }, -}; - static int xtrng_hwrng_trng_read(struct hwrng *hwrng, void *data, size_t max, bool wait) { u8 buf[TRNG_SEC_STRENGTH_BYTES]; @@ -294,12 +243,6 @@ static int xtrng_hwrng_trng_read(struct hwrng *hwrng, void *data, size_t max, bo int ret = -EINVAL, i = 0; rng = container_of(hwrng, struct xilinx_rng, trng); - /* Return in case wait not set and lock not available. */ - if (!mutex_trylock(&rng->lock) && !wait) - return 0; - else if (!mutex_is_locked(&rng->lock) && wait) - mutex_lock(&rng->lock); - while (i < max) { ret = xtrng_random_bytes_generate(rng, buf, TRNG_SEC_STRENGTH_BYTES, wait); if (ret < 0) @@ -308,8 +251,6 @@ static int xtrng_hwrng_trng_read(struct hwrng *hwrng, void *data, size_t max, bo memcpy(data + i, buf, min_t(int, ret, (max - i))); i += min_t(int, ret, (max - i)); } - mutex_unlock(&rng->lock); - return ret; } @@ -355,40 +296,24 @@ static int xtrng_probe(struct platform_device *pdev) sb_size = crypto_drbg_ctr_df_datalen(TRNG_SEED_LEN_BYTES, AES_BLOCK_SIZE); rng->scratchpadbuf = devm_kzalloc(&pdev->dev, sb_size, GFP_KERNEL); - if (!rng->scratchpadbuf) { - ret = -ENOMEM; - goto end; - } + if (!rng->scratchpadbuf) + return -ENOMEM; xtrng_trng_reset(rng->rng_base); ret = xtrng_reseed_internal(rng); if (ret) { dev_err(&pdev->dev, "TRNG Seed fail\n"); - goto end; - } - - xilinx_rng_dev = rng; - mutex_init(&rng->lock); - ret = crypto_register_rng(&xtrng_trng_alg); - if (ret) { - dev_err(&pdev->dev, "Crypto Random device registration failed: %d\n", ret); - goto end; + return ret; } ret = xtrng_hwrng_register(&rng->trng); if (ret) { dev_err(&pdev->dev, "HWRNG device registration failed: %d\n", ret); - goto crypto_rng_free; + return ret; } platform_set_drvdata(pdev, rng); return 0; - -crypto_rng_free: - crypto_unregister_rng(&xtrng_trng_alg); - -end: - return ret; } static void xtrng_remove(struct platform_device *pdev) @@ -398,13 +323,11 @@ static void xtrng_remove(struct platform_device *pdev) rng = platform_get_drvdata(pdev); xtrng_hwrng_unregister(&rng->trng); - crypto_unregister_rng(&xtrng_trng_alg); xtrng_write_multiple_registers(rng->rng_base + TRNG_EXT_SEED_OFFSET, zero, TRNG_NUM_INIT_REGS); xtrng_write_multiple_registers(rng->rng_base + TRNG_PER_STRNG_OFFSET, zero, TRNG_NUM_INIT_REGS); xtrng_hold_reset(rng->rng_base); - xilinx_rng_dev = NULL; } static const struct of_device_id xtrng_of_match[] = { |