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crypto: hisilicon/trng - add version to adapt new algorithm

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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@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Weili Qian 2021-04-07 17:44:33 +08:00 committed by Herbert Xu
parent 0f19dbc994
commit 6e57871c3b
1 changed files with 10 additions and 3 deletions
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13
drivers/crypto/hisilicon/trng/trng.c
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@ -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;