DM: crypto/fsl - Add Freescale rsa DM driver

Driver added for RSA Modular Exponentiation using Freescale Hardware
Accelerator CAAM. The driver uses UCLASS_MOD_EXP

Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
CC: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/drivers/crypto/fsl/fsl_rsa.c b/drivers/crypto/fsl/fsl_rsa.c
new file mode 100644
index 0000000000..cf1c4c1d45
--- /dev/null
+++ b/drivers/crypto/fsl/fsl_rsa.c
@@ -0,0 +1,60 @@
+/*
+ * (C) Copyright 2014 Freescale Semiconductor, Inc.
+ * Author: Ruchika Gupta <ruchika.gupta@freescale.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+#include <common.h>
+#include <dm.h>
+#include <asm/types.h>
+#include <malloc.h>
+#include "jobdesc.h"
+#include "desc.h"
+#include "jr.h"
+#include "rsa_caam.h"
+#include <u-boot/rsa-mod-exp.h>
+
+int fsl_mod_exp(struct udevice *dev, const uint8_t *sig, uint32_t sig_len,
+		struct key_prop *prop, uint8_t *out)
+{
+	uint32_t keylen;
+	struct pk_in_params pkin;
+	uint32_t desc[MAX_CAAM_DESCSIZE];
+	int ret;
+
+	/* Length in bytes */
+	keylen = prop->num_bits / 8;
+
+	pkin.a = sig;
+	pkin.a_siz = sig_len;
+	pkin.n = prop->modulus;
+	pkin.n_siz = keylen;
+	pkin.e = prop->public_exponent;
+	pkin.e_siz = prop->exp_len;
+
+	inline_cnstr_jobdesc_pkha_rsaexp(desc, &pkin, out, sig_len);
+
+	ret = run_descriptor_jr(desc);
+	if (ret) {
+		debug("%s: RSA failed to verify: %d\n", __func__, ret);
+		return -EFAULT;
+	}
+
+	return 0;
+}
+
+static const struct mod_exp_ops fsl_mod_exp_ops = {
+	.mod_exp	= fsl_mod_exp,
+};
+
+U_BOOT_DRIVER(fsl_rsa_mod_exp) = {
+	.name	= "fsl_rsa_mod_exp",
+	.id	= UCLASS_MOD_EXP,
+	.ops	= &fsl_mod_exp_ops,
+};
+
+U_BOOT_DEVICE(fsl_rsa) = {
+	.name = "fsl_rsa_mod_exp",
+};