+++ /dev/null
-From b8ae5c7387ad075ee61e8c8774ce2bca46bc9236 Mon Sep 17 00:00:00 2001
-From: Corentin LABBE <clabbe.montjoie@gmail.com>
-Date: Mon, 3 Jul 2017 20:48:48 +0200
-Subject: crypto: sun4i-ss - support the Security System PRNG
-
-The Security System has a PRNG, this patch adds support for it via
-crypto_rng.
-
-Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
-Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
----
- drivers/crypto/Kconfig | 8 +++++
- drivers/crypto/sunxi-ss/Makefile | 1 +
- drivers/crypto/sunxi-ss/sun4i-ss-core.c | 30 ++++++++++++++++++
- drivers/crypto/sunxi-ss/sun4i-ss-prng.c | 56 +++++++++++++++++++++++++++++++++
- drivers/crypto/sunxi-ss/sun4i-ss.h | 11 +++++++
- 5 files changed, 106 insertions(+)
- create mode 100644 drivers/crypto/sunxi-ss/sun4i-ss-prng.c
-
---- a/drivers/crypto/Kconfig
-+++ b/drivers/crypto/Kconfig
-@@ -538,6 +538,14 @@ config CRYPTO_DEV_SUN4I_SS
- To compile this driver as a module, choose M here: the module
- will be called sun4i-ss.
-
-+config CRYPTO_DEV_SUN4I_SS_PRNG
-+ bool "Support for Allwinner Security System PRNG"
-+ depends on CRYPTO_DEV_SUN4I_SS
-+ select CRYPTO_RNG
-+ help
-+ Select this option if you want to provide kernel-side support for
-+ the Pseudo-Random Number Generator found in the Security System.
-+
- config CRYPTO_DEV_ROCKCHIP
- tristate "Rockchip's Cryptographic Engine driver"
- depends on OF && ARCH_ROCKCHIP
---- a/drivers/crypto/sunxi-ss/Makefile
-+++ b/drivers/crypto/sunxi-ss/Makefile
-@@ -1,2 +1,3 @@
- obj-$(CONFIG_CRYPTO_DEV_SUN4I_SS) += sun4i-ss.o
- sun4i-ss-y += sun4i-ss-core.o sun4i-ss-hash.o sun4i-ss-cipher.o
-+sun4i-ss-$(CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG) += sun4i-ss-prng.o
---- a/drivers/crypto/sunxi-ss/sun4i-ss-core.c
-+++ b/drivers/crypto/sunxi-ss/sun4i-ss-core.c
-@@ -214,6 +214,23 @@ static struct sun4i_ss_alg_template ss_a
- }
- }
- },
-+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG
-+{
-+ .type = CRYPTO_ALG_TYPE_RNG,
-+ .alg.rng = {
-+ .base = {
-+ .cra_name = "stdrng",
-+ .cra_driver_name = "sun4i_ss_rng",
-+ .cra_priority = 300,
-+ .cra_ctxsize = 0,
-+ .cra_module = THIS_MODULE,
-+ },
-+ .generate = sun4i_ss_prng_generate,
-+ .seed = sun4i_ss_prng_seed,
-+ .seedsize = SS_SEED_LEN / BITS_PER_BYTE,
-+ }
-+},
-+#endif
- };
-
- static int sun4i_ss_probe(struct platform_device *pdev)
-@@ -356,6 +373,13 @@ static int sun4i_ss_probe(struct platfor
- goto error_alg;
- }
- break;
-+ case CRYPTO_ALG_TYPE_RNG:
-+ err = crypto_register_rng(&ss_algs[i].alg.rng);
-+ if (err) {
-+ dev_err(ss->dev, "Fail to register %s\n",
-+ ss_algs[i].alg.rng.base.cra_name);
-+ }
-+ break;
- }
- }
- platform_set_drvdata(pdev, ss);
-@@ -370,6 +394,9 @@ error_alg:
- case CRYPTO_ALG_TYPE_AHASH:
- crypto_unregister_ahash(&ss_algs[i].alg.hash);
- break;
-+ case CRYPTO_ALG_TYPE_RNG:
-+ crypto_unregister_rng(&ss_algs[i].alg.rng);
-+ break;
- }
- }
- if (ss->reset)
-@@ -394,6 +421,9 @@ static int sun4i_ss_remove(struct platfo
- case CRYPTO_ALG_TYPE_AHASH:
- crypto_unregister_ahash(&ss_algs[i].alg.hash);
- break;
-+ case CRYPTO_ALG_TYPE_RNG:
-+ crypto_unregister_rng(&ss_algs[i].alg.rng);
-+ break;
- }
- }
-
---- /dev/null
-+++ b/drivers/crypto/sunxi-ss/sun4i-ss-prng.c
-@@ -0,0 +1,56 @@
-+#include "sun4i-ss.h"
-+
-+int sun4i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed,
-+ unsigned int slen)
-+{
-+ struct sun4i_ss_alg_template *algt;
-+ struct rng_alg *alg = crypto_rng_alg(tfm);
-+
-+ algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng);
-+ memcpy(algt->ss->seed, seed, slen);
-+
-+ return 0;
-+}
-+
-+int sun4i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,
-+ unsigned int slen, u8 *dst, unsigned int dlen)
-+{
-+ struct sun4i_ss_alg_template *algt;
-+ struct rng_alg *alg = crypto_rng_alg(tfm);
-+ int i;
-+ u32 v;
-+ u32 *data = (u32 *)dst;
-+ const u32 mode = SS_OP_PRNG | SS_PRNG_CONTINUE | SS_ENABLED;
-+ size_t len;
-+ struct sun4i_ss_ctx *ss;
-+ unsigned int todo = (dlen / 4) * 4;
-+
-+ algt = container_of(alg, struct sun4i_ss_alg_template, alg.rng);
-+ ss = algt->ss;
-+
-+ spin_lock(&ss->slock);
-+
-+ writel(mode, ss->base + SS_CTL);
-+
-+ while (todo > 0) {
-+ /* write the seed */
-+ for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++)
-+ writel(ss->seed[i], ss->base + SS_KEY0 + i * 4);
-+
-+ /* Read the random data */
-+ len = min_t(size_t, SS_DATA_LEN / BITS_PER_BYTE, todo);
-+ readsl(ss->base + SS_TXFIFO, data, len / 4);
-+ data += len / 4;
-+ todo -= len;
-+
-+ /* Update the seed */
-+ for (i = 0; i < SS_SEED_LEN / BITS_PER_LONG; i++) {
-+ v = readl(ss->base + SS_KEY0 + i * 4);
-+ ss->seed[i] = v;
-+ }
-+ }
-+
-+ writel(0, ss->base + SS_CTL);
-+ spin_unlock(&ss->slock);
-+ return dlen;
-+}
---- a/drivers/crypto/sunxi-ss/sun4i-ss.h
-+++ b/drivers/crypto/sunxi-ss/sun4i-ss.h
-@@ -30,6 +30,7 @@
- #include <crypto/aes.h>
- #include <crypto/des.h>
- #include <crypto/internal/rng.h>
-+#include <crypto/rng.h>
-
- #define SS_CTL 0x00
- #define SS_KEY0 0x04
-@@ -125,6 +126,9 @@
- #define SS_RXFIFO_EMP_INT_ENABLE (1 << 2)
- #define SS_TXFIFO_AVA_INT_ENABLE (1 << 0)
-
-+#define SS_SEED_LEN 192
-+#define SS_DATA_LEN 160
-+
- struct sun4i_ss_ctx {
- void __iomem *base;
- int irq;
-@@ -134,6 +138,9 @@ struct sun4i_ss_ctx {
- struct device *dev;
- struct resource *res;
- spinlock_t slock; /* control the use of the device */
-+#ifdef CONFIG_CRYPTO_DEV_SUN4I_SS_PRNG
-+ u32 seed[SS_SEED_LEN / BITS_PER_LONG];
-+#endif
- };
-
- struct sun4i_ss_alg_template {
-@@ -142,6 +149,7 @@ struct sun4i_ss_alg_template {
- union {
- struct crypto_alg crypto;
- struct ahash_alg hash;
-+ struct rng_alg rng;
- } alg;
- struct sun4i_ss_ctx *ss;
- };
-@@ -199,3 +207,6 @@ int sun4i_ss_des_setkey(struct crypto_ab
- unsigned int keylen);
- int sun4i_ss_des3_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
- unsigned int keylen);
-+int sun4i_ss_prng_generate(struct crypto_rng *tfm, const u8 *src,
-+ unsigned int slen, u8 *dst, unsigned int dlen);
-+int sun4i_ss_prng_seed(struct crypto_rng *tfm, const u8 *seed, unsigned int slen);
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