[PATCH v4 5/6] crypto: qcom: Add support for prng-ee

Vinod Koul
2018-07-04T11:44:26Z

Qcom 8996 and later chips features multiple Execution Environments
(EE) and secure world is typically responsible for configuring the
prng.

Add driver data for qcom,prng as 0 and qcom,prng-ee as 1 and use
that to skip initialization routine.

Signed-off-by: Vinod Koul <vkoul@kernel.org>
---
drivers/crypto/qcom-rng.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/qcom-rng.c b/drivers/crypto/qcom-rng.c
index 53e1d276e05e..f1bd86acaf9d 100644
--- a/drivers/crypto/qcom-rng.c
+++ b/drivers/crypto/qcom-rng.c
@@ -28,6 +28,7 @@ struct qcom_rng {
struct mutex lock;
void __iomem *base;
struct clk *clk;
+ unsigned int skip_init;
};

struct qcom_rng_ctx {
@@ -128,7 +129,10 @@ static int qcom_rng_init(struct crypto_tfm *tfm)

ctx->rng = qcom_rng_dev;

- return qcom_rng_enable(ctx->rng);
+ if (!ctx->rng->skip_init)
+ return qcom_rng_enable(ctx->rng);
+
+ return 0;
}

static struct rng_alg qcom_rng_alg = {
@@ -168,6 +172,8 @@ static int qcom_rng_probe(struct platform_device *pdev)
if (IS_ERR(rng->clk))
return PTR_ERR(rng->clk);

+ rng->skip_init = (unsigned long)of_device_get_match_data(&pdev->dev);
+
qcom_rng_dev = rng;
ret = crypto_register_rng(&qcom_rng_alg);
if (ret) {
@@ -188,7 +194,8 @@ static int qcom_rng_remove(struct platform_device *pdev)
}

static const struct of_device_id qcom_rng_of_match[] = {
- { .compatible = "qcom,prng" },
+ { .compatible = "qcom,prng", .data = (void *)0},
+ { .compatible = "qcom,prng-ee", .data = (void *)1},
{}
};
MODULE_DEVICE_TABLE(of, qcom_rng_of_match);
--
2.14.4