From 84cf48278bc94dfc1b4ffafa987ae115abcc625a Mon Sep 17 00:00:00 2001 From: Alex Porosanu Date: Mon, 9 Sep 2013 18:56:30 +0300 Subject: crypto: caam - fix RNG4 instantiation The RNG4 block in CAAM needs to be 'seeded' first before being used for generating pseudo-random data. The 'seeding' is done by getting entropy from the TRNG ring oscillator. The RTFRQMAX register controls the maximum allowable number of samples that can be aquired during an entropy sample. Depending on the clock at which the RNG4 block (and for that matter the SEC block) runs, it's possible that a hard-coded value for the maximum frequency is inadequate, i.e. more samples than needed are taken. This is an error, and thus the RNG4 block doesn't get initialized. The patch attempts to alleviate this issue by trying with progressivly larger frequencies, until the number of samples is adequate. This patch also fixes how a descriptor is deemed as being finished: instead of checking the VALID field in the DECO debug register, it makes sure that the DECO is idle, by checking the DECO state field of the said register. Signed-off-by: Alex Porosanu Signed-off-by: Herbert Xu --- drivers/crypto/caam/regs.h | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'drivers/crypto/caam/regs.h') diff --git a/drivers/crypto/caam/regs.h b/drivers/crypto/caam/regs.h index 4455396918de..9aa9f718a6fc 100644 --- a/drivers/crypto/caam/regs.h +++ b/drivers/crypto/caam/regs.h @@ -255,6 +255,8 @@ struct rng4tst { }; #define RTSDCTL_ENT_DLY_SHIFT 16 #define RTSDCTL_ENT_DLY_MASK (0xffff << RTSDCTL_ENT_DLY_SHIFT) +#define RTSDCTL_ENT_DLY_MIN 1200 +#define RTSDCTL_ENT_DLY_MAX 12800 u32 rtsdctl; /* seed control register */ union { u32 rtsblim; /* PRGM=1: sparse bit limit register */ @@ -706,12 +708,13 @@ struct caam_deco { u32 rsvd29[48]; u32 descbuf[64]; /* DxDESB - Descriptor buffer */ u32 rscvd30[193]; +#define DESC_DBG_DECO_STAT_HOST_ERR 0x00D00000 +#define DESC_DBG_DECO_STAT_VALID 0x80000000 +#define DESC_DBG_DECO_STAT_MASK 0x00F00000 u32 desc_dbg; /* DxDDR - DECO Debug Register */ u32 rsvd31[126]; }; -/* DECO DBG Register Valid Bit*/ -#define DECO_DBG_VALID 0x80000000 #define DECO_JQCR_WHL 0x20000000 #define DECO_JQCR_FOUR 0x10000000 -- cgit v1.2.3