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| author | Josh Boyer <jwboyer@linux.vnet.ibm.com> | 2011-06-27 15:39:07 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2011-06-30 07:44:05 +0800 |
| commit | c5697462ae94693764e468b701c616bbbd6f951c (patch) | |
| tree | 806796e0e6052c4fddc56e5511d75b2bfd03e9bd /drivers/crypto | |
| parent | 23457bc9566be64f33afdc159aadd42712673e0b (diff) | |
| download | linux-3.10-c5697462ae94693764e468b701c616bbbd6f951c.tar.gz linux-3.10-c5697462ae94693764e468b701c616bbbd6f951c.tar.bz2 linux-3.10-c5697462ae94693764e468b701c616bbbd6f951c.zip | |
crypto: crypto4xx - Perform read/modify/write on device control register
The Security function on the AMCC SoCs has multiple engines within a
single MMIO range. The crypto driver currently enables the 3DES
functionality by doing a blind write to the device control register.
This can unintentionally disable other functions like the PKA or TRNG
when the driver is loaded.
Perform a read/modify/write to enable the 3DES function instead.
Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
| -rw-r--r-- | drivers/crypto/amcc/crypto4xx_core.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/crypto/amcc/crypto4xx_core.c b/drivers/crypto/amcc/crypto4xx_core.c index 18912521a7a..1d103f997dc 100644 --- a/drivers/crypto/amcc/crypto4xx_core.c +++ b/drivers/crypto/amcc/crypto4xx_core.c @@ -51,6 +51,7 @@ static void crypto4xx_hw_init(struct crypto4xx_device *dev) union ce_io_threshold io_threshold; u32 rand_num; union ce_pe_dma_cfg pe_dma_cfg; + u32 device_ctrl; writel(PPC4XX_BYTE_ORDER, dev->ce_base + CRYPTO4XX_BYTE_ORDER_CFG); /* setup pe dma, include reset sg, pdr and pe, then release reset */ @@ -84,7 +85,9 @@ static void crypto4xx_hw_init(struct crypto4xx_device *dev) writel(ring_size.w, dev->ce_base + CRYPTO4XX_RING_SIZE); ring_ctrl.w = 0; writel(ring_ctrl.w, dev->ce_base + CRYPTO4XX_RING_CTRL); - writel(PPC4XX_DC_3DES_EN, dev->ce_base + CRYPTO4XX_DEVICE_CTRL); + device_ctrl = readl(dev->ce_base + CRYPTO4XX_DEVICE_CTRL); + device_ctrl |= PPC4XX_DC_3DES_EN; + writel(device_ctrl, dev->ce_base + CRYPTO4XX_DEVICE_CTRL); writel(dev->gdr_pa, dev->ce_base + CRYPTO4XX_GATH_RING_BASE); writel(dev->sdr_pa, dev->ce_base + CRYPTO4XX_SCAT_RING_BASE); part_ring_size.w = 0; |