diff options
Diffstat (limited to 'drivers/crypto/caam/caamrng.c')
| -rw-r--r-- | drivers/crypto/caam/caamrng.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/drivers/crypto/caam/caamrng.c b/drivers/crypto/caam/caamrng.c index 5095337205b8..9b92af2c7241 100644 --- a/drivers/crypto/caam/caamrng.c +++ b/drivers/crypto/caam/caamrng.c @@ -108,6 +108,10 @@ static void rng_done(struct device *jrdev, u32 *desc, u32 err, void *context) atomic_set(&bd->empty, BUF_NOT_EMPTY); complete(&bd->filled); + + /* Buffer refilled, invalidate cache */ + dma_sync_single_for_cpu(jrdev, bd->addr, RN_BUF_SIZE, DMA_FROM_DEVICE); + #ifdef DEBUG print_hex_dump(KERN_ERR, "rng refreshed buf@: ", DUMP_PREFIX_ADDRESS, 16, 4, bd->buf, RN_BUF_SIZE, 1); @@ -311,7 +315,7 @@ static int __init caam_rng_init(void) struct device_node *dev_node; struct platform_device *pdev; struct device *ctrldev; - void *priv; + struct caam_drv_private *priv; int err; dev_node = of_find_compatible_node(NULL, NULL, "fsl,sec-v4.0"); @@ -338,20 +342,32 @@ static int __init caam_rng_init(void) if (!priv) return -ENODEV; + /* Check for an instantiated RNG before registration */ + if (!(rd_reg32(&priv->ctrl->perfmon.cha_num_ls) & CHA_ID_LS_RNG_MASK)) + return -ENODEV; + dev = caam_jr_alloc(); if (IS_ERR(dev)) { pr_err("Job Ring Device allocation for transform failed\n"); return PTR_ERR(dev); } - rng_ctx = kmalloc(sizeof(struct caam_rng_ctx), GFP_DMA); - if (!rng_ctx) - return -ENOMEM; + rng_ctx = kmalloc(sizeof(*rng_ctx), GFP_DMA); + if (!rng_ctx) { + err = -ENOMEM; + goto free_caam_alloc; + } err = caam_init_rng(rng_ctx, dev); if (err) - return err; + goto free_rng_ctx; dev_info(dev, "registering rng-caam\n"); return hwrng_register(&caam_rng); + +free_rng_ctx: + kfree(rng_ctx); +free_caam_alloc: + caam_jr_free(dev); + return err; } module_init(caam_rng_init); |