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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>
This commit is contained in:
Josh Boyer 2011-06-27 15:39:07 +08:00 committed by Herbert Xu
parent 23457bc956
commit c5697462ae
1 changed files with 4 additions and 1 deletions
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5
drivers/crypto/amcc/crypto4xx_core.c
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@ -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;