#define RNGC_CTRL_MASK_ERROR 0x00000040
#define RNGC_CTRL_MASK_DONE 0x00000020
+#define RNGC_CTRL_AUTO_SEED 0x00000010
#define RNGC_STATUS_ERROR 0x00010000
#define RNGC_STATUS_FIFO_LEVEL_MASK 0x00000f00
static int imx_rngc_init(struct hwrng *rng)
{
struct imx_rngc *rngc = container_of(rng, struct imx_rngc, rng);
- u32 cmd;
+ u32 cmd, ctrl;
int ret;
/* clear error */
} while (rngc->err_reg == RNGC_ERROR_STATUS_STAT_ERR);
- return rngc->err_reg ? -EIO : 0;
+ if (rngc->err_reg)
+ return -EIO;
+
+ /*
+ * enable automatic seeding, the rngc creates a new seed automatically
+ * after serving 2^20 random 160-bit words
+ */
+ ctrl = readl(rngc->base + RNGC_CONTROL);
+ ctrl |= RNGC_CTRL_AUTO_SEED;
+ writel(ctrl, rngc->base + RNGC_CONTROL);
+
+ return 0;
}
static int imx_rngc_probe(struct platform_device *pdev)