@@ -151,6 +151,14 @@ config CRYPTO_DEV_FSL_CAAM_RNG_API
Selecting this will register the SEC4 hardware rng to
the hw_random API for supplying the kernel entropy pool.
+config CRYPTO_DEV_FSL_CAAM_PRNG_API
+ bool "Register Pseudo random number generation implementation with Crypto API"
+ default y
+ select CRYPTO_RNG
+ help
+ Selecting this will register the SEC hardware prng to
+ the Crypto API.
+
endif # CRYPTO_DEV_FSL_CAAM_JR
endif # CRYPTO_DEV_FSL_CAAM
@@ -20,6 +20,7 @@ caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API) += caamalg.o
caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI) += caamalg_qi.o
caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_AHASH_API) += caamhash.o
caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_API) += caamrng.o
+caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_PRNG_API) += caamprng.o
caam_jr-$(CONFIG_CRYPTO_DEV_FSL_CAAM_PKC_API) += caampkc.o pkc_desc.o
caam-$(CONFIG_CRYPTO_DEV_FSL_CAAM_CRYPTO_API_QI) += qi.o
new file mode 100644
@@ -0,0 +1,234 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver to expose SEC4 PRNG via crypto RNG API
+ *
+ * Copyright 2022 NXP
+ *
+ */
+
+#include <linux/completion.h>
+#include <crypto/internal/rng.h>
+#include "compat.h"
+#include "regs.h"
+#include "intern.h"
+#include "desc_constr.h"
+#include "jr.h"
+#include "error.h"
+
+/*
+ * Length of used descriptors, see caam_init_desc()
+ */
+#define CAAM_PRNG_DESC_LEN (CAAM_CMD_SZ + \
+ CAAM_CMD_SZ + \
+ CAAM_CMD_SZ + CAAM_PTR_SZ_MAX)
+
+/* prng per-device context */
+struct caam_prng_ctx {
+ int err;
+ struct completion done;
+};
+
+struct caam_prng_alg {
+ struct rng_alg rng;
+ bool registered;
+};
+
+static void caam_prng_done(struct device *jrdev, u32 *desc, u32 err,
+ void *context)
+{
+ struct caam_prng_ctx *jctx = context;
+
+ jctx->err = err ? caam_jr_strstatus(jrdev, err) : 0;
+
+ complete(&jctx->done);
+}
+
+static u32 *caam_init_reseed_desc(u32 *desc)
+{
+ init_job_desc(desc, 0); /* + 1 cmd_sz */
+ /* Generate random bytes: + 1 cmd_sz */
+ append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
+ OP_ALG_AS_FINALIZE);
+
+ print_hex_dump_debug("prng reseed desc@: ", DUMP_PREFIX_ADDRESS,
+ 16, 4, desc, desc_bytes(desc), 1);
+
+ return desc;
+}
+
+static u32 *caam_init_prng_desc(u32 *desc, dma_addr_t dst_dma, u32 len)
+{
+ init_job_desc(desc, 0); /* + 1 cmd_sz */
+ /* Generate random bytes: + 1 cmd_sz */
+ append_operation(desc, OP_ALG_ALGSEL_RNG | OP_TYPE_CLASS1_ALG);
+ /* Store bytes: + 1 cmd_sz + caam_ptr_sz */
+ append_fifo_store(desc, dst_dma,
+ len, FIFOST_TYPE_RNGSTORE);
+
+ print_hex_dump_debug("prng job desc@: ", DUMP_PREFIX_ADDRESS,
+ 16, 4, desc, desc_bytes(desc), 1);
+
+ return desc;
+}
+
+static int caam_prng_generate(struct crypto_rng *tfm,
+ const u8 *src, unsigned int slen,
+ u8 *dst, unsigned int dlen)
+{
+ struct caam_prng_ctx ctx;
+ struct device *jrdev;
+ dma_addr_t dst_dma;
+ u32 *desc;
+ u8 *buf;
+ int ret;
+
+ buf = kzalloc(dlen, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ jrdev = caam_jr_alloc();
+ ret = PTR_ERR_OR_ZERO(jrdev);
+ if (ret) {
+ pr_err("Job Ring Device allocation failed\n");
+ kfree(buf);
+ return ret;
+ }
+
+ desc = kzalloc(CAAM_PRNG_DESC_LEN, GFP_KERNEL | GFP_DMA);
+ if (!desc) {
+ ret = -ENOMEM;
+ goto out1;
+ }
+
+ dst_dma = dma_map_single(jrdev, buf, dlen, DMA_FROM_DEVICE);
+ if (dma_mapping_error(jrdev, dst_dma)) {
+ dev_err(jrdev, "Failed to map destination buffer memory\n");
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ init_completion(&ctx.done);
+ ret = caam_jr_enqueue(jrdev,
+ caam_init_prng_desc(desc, dst_dma, dlen),
+ caam_prng_done, &ctx);
+
+ if (ret == -EINPROGRESS) {
+ wait_for_completion(&ctx.done);
+ ret = ctx.err;
+ }
+
+ dma_unmap_single(jrdev, dst_dma, dlen, DMA_FROM_DEVICE);
+
+ memcpy(dst, buf, dlen);
+out:
+ kfree(desc);
+out1:
+ caam_jr_free(jrdev);
+ kfree(buf);
+ return ret;
+}
+
+static void caam_prng_exit(struct crypto_tfm *tfm) {}
+
+static int caam_prng_init(struct crypto_tfm *tfm)
+{
+ return 0;
+}
+
+static int caam_prng_seed(struct crypto_rng *tfm,
+ const u8 *seed, unsigned int slen)
+{
+ struct caam_prng_ctx ctx;
+ struct device *jrdev;
+ u32 *desc;
+ int ret;
+
+ if (slen) {
+ pr_err("Seed length should be zero\n");
+ return -EINVAL;
+ }
+
+ jrdev = caam_jr_alloc();
+ ret = PTR_ERR_OR_ZERO(jrdev);
+ if (ret) {
+ pr_err("Job Ring Device allocation failed\n");
+ return ret;
+ }
+
+ desc = kzalloc(CAAM_PRNG_DESC_LEN, GFP_KERNEL | GFP_DMA);
+ if (!desc) {
+ caam_jr_free(jrdev);
+ return -ENOMEM;
+ }
+
+ init_completion(&ctx.done);
+ ret = caam_jr_enqueue(jrdev,
+ caam_init_reseed_desc(desc),
+ caam_prng_done, &ctx);
+
+ if (ret == -EINPROGRESS) {
+ wait_for_completion(&ctx.done);
+ ret = ctx.err;
+ }
+
+ kfree(desc);
+ caam_jr_free(jrdev);
+ return ret;
+}
+
+static struct caam_prng_alg caam_prng_alg = {
+ .rng = {
+ .generate = caam_prng_generate,
+ .seed = caam_prng_seed,
+ .seedsize = 0,
+ .base = {
+ .cra_name = "stdrng",
+ .cra_driver_name = "prng-caam",
+ .cra_priority = 500,
+ .cra_ctxsize = sizeof(struct caam_prng_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_init = caam_prng_init,
+ .cra_exit = caam_prng_exit,
+ },
+ }
+};
+
+void caam_prng_unregister(void *data)
+{
+ if (caam_prng_alg.registered)
+ crypto_unregister_rng(&caam_prng_alg.rng);
+}
+
+int caam_prng_register(struct device *ctrldev)
+{
+ struct caam_drv_private *priv = dev_get_drvdata(ctrldev);
+ u32 rng_inst;
+ int ret = 0;
+
+ /* Check for available RNG blocks before registration */
+ if (priv->era < 10)
+ rng_inst = (rd_reg32(&priv->jr[0]->perfmon.cha_num_ls) &
+ CHA_ID_LS_RNG_MASK) >> CHA_ID_LS_RNG_SHIFT;
+ else
+ rng_inst = rd_reg32(&priv->jr[0]->vreg.rng) & CHA_VER_NUM_MASK;
+
+ if (!rng_inst) {
+ dev_dbg(ctrldev, "RNG block is not available... skipping registering algorithm\n");
+ return ret;
+ }
+
+ ret = crypto_register_rng(&caam_prng_alg.rng);
+ if (ret) {
+ dev_err(ctrldev,
+ "couldn't register rng crypto alg: %d\n",
+ ret);
+ return ret;
+ }
+
+ caam_prng_alg.registered = true;
+
+ dev_info(ctrldev,
+ "rng crypto API alg registered %s\n", caam_prng_alg.rng.base.cra_driver_name);
+
+ return 0;
+}
@@ -185,6 +185,21 @@ static inline void caam_rng_exit(struct device *dev) {}
#endif /* CONFIG_CRYPTO_DEV_FSL_CAAM_RNG_API */
+#ifdef CONFIG_CRYPTO_DEV_FSL_CAAM_PRNG_API
+
+int caam_prng_register(struct device *dev);
+void caam_prng_unregister(void *data);
+
+#else
+
+static inline int caam_prng_register(struct device *dev)
+{
+ return 0;
+}
+
+static inline void caam_prng_unregister(void *data) {}
+#endif /* CONFIG_CRYPTO_DEV_FSL_CAAM_PRNG_API */
+
#ifdef CONFIG_CAAM_QI
int caam_qi_algapi_init(struct device *dev);
@@ -39,6 +39,7 @@ static void register_algs(struct caam_drv_private_jr *jrpriv,
caam_algapi_hash_init(dev);
caam_pkc_init(dev);
jrpriv->hwrng = !caam_rng_init(dev);
+ caam_prng_register(dev);
caam_qi_algapi_init(dev);
algs_unlock:
@@ -53,7 +54,7 @@ static void unregister_algs(void)
goto algs_unlock;
caam_qi_algapi_exit();
-
+ caam_prng_unregister(NULL);
caam_pkc_exit();
caam_algapi_hash_exit();
caam_algapi_exit();