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crypto: caam - set RDB bit in security configuration register

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This change is required for post SEC-5.0 devices which have RNG4.
Setting RDB in security configuration register allows CAAM to use the
"Random Data Buffer" to be filled by a single request. The Random Data
Buffer is large enough for ten packets to get their IVs from a single
request. If the Random Data Buffer is not enabled, then each IV causes a
separate request, and RNG4 hardware cannot keep up resulting in lower
IPSEC throughput if random IVs are used.

Signed-off-by: Vakul Garg <vakul@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Vakul Garg 2013-03-12 13:55:21 +05:30 committed by Herbert Xu
parent a80c5422b1
commit 575c1bd549
2 changed files with 6 additions and 1 deletions
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3
drivers/crypto/caam/ctrl.c
View file

@ -304,6 +304,9 @@ static int caam_probe(struct platform_device *pdev)
caam_remove(pdev);
return ret;
}
/* Enable RDB bit so that RNG works faster */
setbits32(&topregs->ctrl.scfgr, SCFGR_RDBENABLE);
}
/* NOTE: RTIC detection ought to go here, around Si time */

4
drivers/crypto/caam/regs.h
View file

@ -252,7 +252,8 @@ struct caam_ctrl {
/* Read/Writable */
u32 rsvd1;
u32 mcr; /* MCFG Master Config Register */
u32 rsvd2[2];
u32 rsvd2;
u32 scfgr; /* SCFGR, Security Config Register */
/* Bus Access Configuration Section 010-11f */
/* Read/Writable */
@ -299,6 +300,7 @@ struct caam_ctrl {
#define MCFGR_WDFAIL 0x20000000 /* DECO watchdog force-fail */
#define MCFGR_DMA_RESET 0x10000000
#define MCFGR_LONG_PTR 0x00010000 /* Use >32-bit desc addressing */
#define SCFGR_RDBENABLE 0x00000400
/* AXI read cache control */
#define MCFGR_ARCACHE_SHIFT 12