Kunpeng930 supports trng and prng, but Kunpeng920 only supports trng.
Therefore, version information is added to ensure that prng is not
registered to Crypto subsystem on Kunpeng920.
Signed-off-by: Weili Qian <qianweili@xxxxxxxxxx>
---
drivers/crypto/hisilicon/trng/trng.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/crypto/hisilicon/trng/trng.c b/drivers/crypto/hisilicon/trng/trng.c
index 2971268..829f2ca 100644
--- a/drivers/crypto/hisilicon/trng/trng.c
+++ b/drivers/crypto/hisilicon/trng/trng.c
@@ -18,6 +18,8 @@
#define HISI_TRNG_REG 0x00F0
#define HISI_TRNG_BYTES 4
#define HISI_TRNG_QUALITY 512
+#define HISI_TRNG_VERSION 0x01B8
+#define HISI_TRNG_VER_V1 GENMASK(31, 0)
#define SLEEP_US 10
#define TIMEOUT_US 10000
#define SW_DRBG_NUM_SHIFT 2
@@ -50,6 +52,7 @@ struct hisi_trng {
struct hisi_trng_list *trng_list;
struct list_head list;
struct hwrng rng;
+ u32 ver;
bool is_used;
struct mutex mutex;
};
@@ -260,6 +263,7 @@ static int hisi_trng_probe(struct platform_device *pdev)
return PTR_ERR(trng->base);
trng->is_used = false;
+ trng->ver = readl(trng->base + HISI_TRNG_VERSION);
if (!trng_devices.is_init) {
INIT_LIST_HEAD(&trng_devices.list);
mutex_init(&trng_devices.lock);
@@ -267,7 +271,8 @@ static int hisi_trng_probe(struct platform_device *pdev)
}
hisi_trng_add_to_list(trng);
- if (atomic_inc_return(&trng_active_devs) == 1) {
+ if (trng->ver != HISI_TRNG_VER_V1 &&
+ atomic_inc_return(&trng_active_devs) == 1) {
ret = crypto_register_rng(&hisi_trng_alg);
if (ret) {
dev_err(&pdev->dev,
@@ -289,7 +294,8 @@ static int hisi_trng_probe(struct platform_device *pdev)
return ret;
err_crypto_unregister:
- if (atomic_dec_return(&trng_active_devs) == 0)
+ if (trng->ver != HISI_TRNG_VER_V1 &&
+ atomic_dec_return(&trng_active_devs) == 0)
crypto_unregister_rng(&hisi_trng_alg);
err_remove_from_list:
@@ -305,7 +311,8 @@ static int hisi_trng_remove(struct platform_device *pdev)
while (hisi_trng_del_from_list(trng))
;
- if (atomic_dec_return(&trng_active_devs) == 0)
+ if (trng->ver != HISI_TRNG_VER_V1 &&
+ atomic_dec_return(&trng_active_devs) == 0)
crypto_unregister_rng(&hisi_trng_alg);
return 0;
--
2.8.1
