Commit df80bfd3 authored by Horia Geantă's avatar Horia Geantă Committed by Herbert Xu

crypto: caam/jr - update gcm detection logic

GCM detection logic has to change for two reasons:
-some CAAM instantiations with Era < 10, even though they have AES LP,
they now support GCM mode
-Era 10 upwards, there is a dedicated bit in AESA_VERSION[AESA_MISC]
field for GCM support

For Era 9 and earlier, all AES accelerator versions support GCM,
except for AES LP (CHAVID_LS[AESVID]=3) with revision CRNR[AESRN] < 8.

For Era 10 and later, bit 9 of the AESA_VERSION register should be used
to detect GCM support in AES accelerator.

Note: caam/qi and caam/qi2 are drivers for QI (Queue Interface), which
is used in DPAA-based SoCs; for now, we rely on CAAM having an AES HP
and this AES accelerator having support for GCM.
Signed-off-by: default avatarHoria Geantă <horia.geanta@nxp.com>
Reviewed-by: default avatarIuliana Prodan <iuliana.prodan@nxp.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 6ddc8e31
...@@ -3493,7 +3493,7 @@ static int __init caam_algapi_init(void) ...@@ -3493,7 +3493,7 @@ static int __init caam_algapi_init(void)
u32 aes_vid, aes_inst, des_inst, md_vid, md_inst, ccha_inst, ptha_inst; u32 aes_vid, aes_inst, des_inst, md_vid, md_inst, ccha_inst, ptha_inst;
u32 arc4_inst; u32 arc4_inst;
unsigned int md_limit = SHA512_DIGEST_SIZE; unsigned int md_limit = SHA512_DIGEST_SIZE;
bool registered = false; bool registered = false, gcm_support;
dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0"); dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0");
if (!dev_node) { if (!dev_node) {
...@@ -3526,7 +3526,7 @@ static int __init caam_algapi_init(void) ...@@ -3526,7 +3526,7 @@ static int __init caam_algapi_init(void)
* First, detect presence and attributes of DES, AES, and MD blocks. * First, detect presence and attributes of DES, AES, and MD blocks.
*/ */
if (priv->era < 10) { if (priv->era < 10) {
u32 cha_vid, cha_inst; u32 cha_vid, cha_inst, aes_rn;
cha_vid = rd_reg32(&priv->ctrl->perfmon.cha_id_ls); cha_vid = rd_reg32(&priv->ctrl->perfmon.cha_id_ls);
aes_vid = cha_vid & CHA_ID_LS_AES_MASK; aes_vid = cha_vid & CHA_ID_LS_AES_MASK;
...@@ -3541,6 +3541,10 @@ static int __init caam_algapi_init(void) ...@@ -3541,6 +3541,10 @@ static int __init caam_algapi_init(void)
CHA_ID_LS_ARC4_SHIFT; CHA_ID_LS_ARC4_SHIFT;
ccha_inst = 0; ccha_inst = 0;
ptha_inst = 0; ptha_inst = 0;
aes_rn = rd_reg32(&priv->ctrl->perfmon.cha_rev_ls) &
CHA_ID_LS_AES_MASK;
gcm_support = !(aes_vid == CHA_VER_VID_AES_LP && aes_rn < 8);
} else { } else {
u32 aesa, mdha; u32 aesa, mdha;
...@@ -3556,6 +3560,8 @@ static int __init caam_algapi_init(void) ...@@ -3556,6 +3560,8 @@ static int __init caam_algapi_init(void)
ccha_inst = rd_reg32(&priv->ctrl->vreg.ccha) & CHA_VER_NUM_MASK; ccha_inst = rd_reg32(&priv->ctrl->vreg.ccha) & CHA_VER_NUM_MASK;
ptha_inst = rd_reg32(&priv->ctrl->vreg.ptha) & CHA_VER_NUM_MASK; ptha_inst = rd_reg32(&priv->ctrl->vreg.ptha) & CHA_VER_NUM_MASK;
arc4_inst = rd_reg32(&priv->ctrl->vreg.afha) & CHA_VER_NUM_MASK; arc4_inst = rd_reg32(&priv->ctrl->vreg.afha) & CHA_VER_NUM_MASK;
gcm_support = aesa & CHA_VER_MISC_AES_GCM;
} }
/* If MD is present, limit digest size based on LP256 */ /* If MD is present, limit digest size based on LP256 */
...@@ -3628,11 +3634,9 @@ static int __init caam_algapi_init(void) ...@@ -3628,11 +3634,9 @@ static int __init caam_algapi_init(void)
if (c2_alg_sel == OP_ALG_ALGSEL_POLY1305 && !ptha_inst) if (c2_alg_sel == OP_ALG_ALGSEL_POLY1305 && !ptha_inst)
continue; continue;
/* /* Skip GCM algorithms if not supported by device */
* Check support for AES algorithms not available if (c1_alg_sel == OP_ALG_ALGSEL_AES &&
* on LP devices. alg_aai == OP_ALG_AAI_GCM && !gcm_support)
*/
if (aes_vid == CHA_VER_VID_AES_LP && alg_aai == OP_ALG_AAI_GCM)
continue; continue;
/* /*
......
...@@ -261,6 +261,9 @@ struct version_regs { ...@@ -261,6 +261,9 @@ struct version_regs {
#define CHA_VER_VID_SHIFT 24 #define CHA_VER_VID_SHIFT 24
#define CHA_VER_VID_MASK (0xffull << CHA_VER_VID_SHIFT) #define CHA_VER_VID_MASK (0xffull << CHA_VER_VID_SHIFT)
/* CHA Miscellaneous Information - AESA_MISC specific */
#define CHA_VER_MISC_AES_GCM BIT(1 + CHA_VER_MISC_SHIFT)
/* /*
* caam_perfmon - Performance Monitor/Secure Memory Status/ * caam_perfmon - Performance Monitor/Secure Memory Status/
* CAAM Global Status/Component Version IDs * CAAM Global Status/Component Version IDs
......
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