diff options
| author | Michael Walle <michael@walle.cc> | 2021-09-16 00:03:07 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2021-09-24 16:03:04 +0800 |
| commit | f20311cc9c58052e0b215013046cbf390937910c (patch) | |
| tree | 00147e9f064b8ce5a1204340a370f01d85fa91ee | |
| parent | a2d3cbc80d2527b435154ff0f89b56ef4b84370f (diff) | |
| download | linux-f20311cc9c58052e0b215013046cbf390937910c.tar.bz2 | |
crypto: caam - disable pkc for non-E SoCs
On newer CAAM versions, not all accelerators are disabled if the SoC is
a non-E variant. While the driver checks most of the modules for
availability, there is one - PKHA - which sticks out. On non-E variants
it is still reported as available, that is the number of instances is
non-zero, but it has limited functionality. In particular it doesn't
support encryption and decryption, but just signing and verifying. This
is indicated by a bit in the PKHA_MISC field. Take this bit into account
if we are checking for availability.
This will the following error:
[ 8.167817] caam_jr 8020000.jr: 20000b0f: CCB: desc idx 11: : Invalid CHA selected.
Tested on an NXP LS1028A (non-E) SoC.
Fixes: d239b10d4ceb ("crypto: caam - add register map changes cf. Era 10")
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | drivers/crypto/caam/caampkc.c | 19 | ||||
| -rw-r--r-- | drivers/crypto/caam/regs.h | 3 |
2 files changed, 18 insertions, 4 deletions
diff --git a/drivers/crypto/caam/caampkc.c b/drivers/crypto/caam/caampkc.c index e313233ec6de..bf6275ffc4aa 100644 --- a/drivers/crypto/caam/caampkc.c +++ b/drivers/crypto/caam/caampkc.c @@ -1153,16 +1153,27 @@ static struct caam_akcipher_alg caam_rsa = { int caam_pkc_init(struct device *ctrldev) { struct caam_drv_private *priv = dev_get_drvdata(ctrldev); - u32 pk_inst; + u32 pk_inst, pkha; int err; init_done = false; /* Determine public key hardware accelerator presence. */ - if (priv->era < 10) + if (priv->era < 10) { pk_inst = (rd_reg32(&priv->ctrl->perfmon.cha_num_ls) & CHA_ID_LS_PK_MASK) >> CHA_ID_LS_PK_SHIFT; - else - pk_inst = rd_reg32(&priv->ctrl->vreg.pkha) & CHA_VER_NUM_MASK; + } else { + pkha = rd_reg32(&priv->ctrl->vreg.pkha); + pk_inst = pkha & CHA_VER_NUM_MASK; + + /* + * Newer CAAMs support partially disabled functionality. If this is the + * case, the number is non-zero, but this bit is set to indicate that + * no encryption or decryption is supported. Only signing and verifying + * is supported. + */ + if (pkha & CHA_VER_MISC_PKHA_NO_CRYPT) + pk_inst = 0; + } /* Do not register algorithms if PKHA is not present. */ if (!pk_inst) diff --git a/drivers/crypto/caam/regs.h b/drivers/crypto/caam/regs.h index af61f3a2c0d4..3738625c0250 100644 --- a/drivers/crypto/caam/regs.h +++ b/drivers/crypto/caam/regs.h @@ -322,6 +322,9 @@ struct version_regs { /* CHA Miscellaneous Information - AESA_MISC specific */ #define CHA_VER_MISC_AES_GCM BIT(1 + CHA_VER_MISC_SHIFT) +/* CHA Miscellaneous Information - PKHA_MISC specific */ +#define CHA_VER_MISC_PKHA_NO_CRYPT BIT(7 + CHA_VER_MISC_SHIFT) + /* * caam_perfmon - Performance Monitor/Secure Memory Status/ * CAAM Global Status/Component Version IDs |