4 files changed, 89 insertions, 13 deletions

diff --git a/drivers/char/hw_random/atmel-rng.c b/drivers/char/hw_random/atmel-rng.c
index 143406bc6939..d2b00458761e 100644
--- a/drivers/char/hw_random/atmel-rng.c
+++ b/drivers/char/hw_random/atmel-rng.c
@@ -37,6 +37,7 @@ struct atmel_trng {
 	struct clk *clk;
 	void __iomem *base;
 	struct hwrng rng;
+	struct device *dev;
 	bool has_half_rate;
 };
 
@@ -59,9 +60,9 @@ static int atmel_trng_read(struct hwrng *rng, void *buf, size_t max,
 	u32 *data = buf;
 	int ret;
 
-	ret = pm_runtime_get_sync((struct device *)trng->rng.priv);
+	ret = pm_runtime_get_sync(trng->dev);
 	if (ret < 0) {
-		pm_runtime_put_sync((struct device *)trng->rng.priv);
+		pm_runtime_put_sync(trng->dev);
 		return ret;
 	}
 
@@ -79,8 +80,8 @@ static int atmel_trng_read(struct hwrng *rng, void *buf, size_t max,
 	ret = 4;
 
 out:
-	pm_runtime_mark_last_busy((struct device *)trng->rng.priv);
-	pm_runtime_put_sync_autosuspend((struct device *)trng->rng.priv);
+	pm_runtime_mark_last_busy(trng->dev);
+	pm_runtime_put_sync_autosuspend(trng->dev);
 	return ret;
 }
 
@@ -134,9 +135,9 @@ static int atmel_trng_probe(struct platform_device *pdev)
 		return -ENODEV;
 
 	trng->has_half_rate = data->has_half_rate;
+	trng->dev = &pdev->dev;
 	trng->rng.name = pdev->name;
 	trng->rng.read = atmel_trng_read;
-	trng->rng.priv = (unsigned long)&pdev->dev;
 	platform_set_drvdata(pdev, trng);
 
 #ifndef CONFIG_PM
diff --git a/drivers/char/hw_random/mtk-rng.c b/drivers/char/hw_random/mtk-rng.c
index 1e3048f2bb38..b7fa1bc1122b 100644
--- a/drivers/char/hw_random/mtk-rng.c
+++ b/drivers/char/hw_random/mtk-rng.c
@@ -36,6 +36,7 @@ struct mtk_rng {
 	void __iomem *base;
 	struct clk *clk;
 	struct hwrng rng;
+	struct device *dev;
 };
 
 static int mtk_rng_init(struct hwrng *rng)
@@ -85,7 +86,7 @@ static int mtk_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
 	struct mtk_rng *priv = to_mtk_rng(rng);
 	int retval = 0;
 
-	pm_runtime_get_sync((struct device *)priv->rng.priv);
+	pm_runtime_get_sync(priv->dev);
 
 	while (max >= sizeof(u32)) {
 		if (!mtk_rng_wait_ready(rng, wait))
@@ -97,8 +98,8 @@ static int mtk_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
 		max -= sizeof(u32);
 	}
 
-	pm_runtime_mark_last_busy((struct device *)priv->rng.priv);
-	pm_runtime_put_sync_autosuspend((struct device *)priv->rng.priv);
+	pm_runtime_mark_last_busy(priv->dev);
+	pm_runtime_put_sync_autosuspend(priv->dev);
 
 	return retval || !wait ? retval : -EIO;
 }
@@ -112,13 +113,13 @@ static int mtk_rng_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
+	priv->dev = &pdev->dev;
 	priv->rng.name = pdev->name;
 #ifndef CONFIG_PM
 	priv->rng.init = mtk_rng_init;
 	priv->rng.cleanup = mtk_rng_cleanup;
 #endif
 	priv->rng.read = mtk_rng_read;
-	priv->rng.priv = (unsigned long)&pdev->dev;
 	priv->rng.quality = 900;
 
 	priv->clk = devm_clk_get(&pdev->dev, "rng");
diff --git a/drivers/char/hw_random/npcm-rng.c b/drivers/char/hw_random/npcm-rng.c
index 9ff00f096f38..3e308c890bd2 100644
--- a/drivers/char/hw_random/npcm-rng.c
+++ b/drivers/char/hw_random/npcm-rng.c
@@ -32,6 +32,7 @@
 struct npcm_rng {
 	void __iomem *base;
 	struct hwrng rng;
+	struct device *dev;
 	u32 clkp;
 };
 
@@ -57,7 +58,7 @@ static int npcm_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
 	int retval = 0;
 	int ready;
 
-	pm_runtime_get_sync((struct device *)priv->rng.priv);
+	pm_runtime_get_sync(priv->dev);
 
 	while (max) {
 		if (wait) {
@@ -79,8 +80,8 @@ static int npcm_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
 		max--;
 	}
 
-	pm_runtime_mark_last_busy((struct device *)priv->rng.priv);
-	pm_runtime_put_sync_autosuspend((struct device *)priv->rng.priv);
+	pm_runtime_mark_last_busy(priv->dev);
+	pm_runtime_put_sync_autosuspend(priv->dev);
 
 	return retval || !wait ? retval : -EIO;
 }
@@ -109,7 +110,7 @@ static int npcm_rng_probe(struct platform_device *pdev)
 #endif
 	priv->rng.name = pdev->name;
 	priv->rng.read = npcm_rng_read;
-	priv->rng.priv = (unsigned long)&pdev->dev;
+	priv->dev = &pdev->dev;
 	priv->clkp = (u32)(uintptr_t)of_device_get_match_data(&pdev->dev);
 
 	writel(NPCM_RNG_M1ROSEL, priv->base + NPCM_RNGMODE_REG);
diff --git a/drivers/char/hw_random/rockchip-rng.c b/drivers/char/hw_random/rockchip-rng.c
index 161050591663..fb4a30b95507 100644
--- a/drivers/char/hw_random/rockchip-rng.c
+++ b/drivers/char/hw_random/rockchip-rng.c
@@ -93,6 +93,30 @@
 #define TRNG_v1_VERSION_CODE			0x46bc
 /* end of TRNG_V1 register definitions */
 
+/*
+ * RKRNG register definitions
+ * The RKRNG IP is a stand-alone TRNG implementation (not part of a crypto IP)
+ * and can be found in the Rockchip RK3576, Rockchip RK3562 and Rockchip RK3528
+ * SoCs. It can either output true randomness (TRNG) or "deterministic"
+ * randomness derived from hashing the true entropy (DRNG). This driver
+ * implementation uses just the true entropy, and leaves stretching the entropy
+ * up to Linux.
+ */
+#define RKRNG_CFG				0x0000
+#define RKRNG_CTRL				0x0010
+#define RKRNG_CTRL_REQ_TRNG			BIT(4)
+#define RKRNG_STATE				0x0014
+#define RKRNG_STATE_TRNG_RDY			BIT(4)
+#define RKRNG_TRNG_DATA0			0x0050
+#define RKRNG_TRNG_DATA1			0x0054
+#define RKRNG_TRNG_DATA2			0x0058
+#define RKRNG_TRNG_DATA3			0x005C
+#define RKRNG_TRNG_DATA4			0x0060
+#define RKRNG_TRNG_DATA5			0x0064
+#define RKRNG_TRNG_DATA6			0x0068
+#define RKRNG_TRNG_DATA7			0x006C
+#define RKRNG_READ_LEN				32
+
 /* Before removing this assert, give rk3588_rng_read an upper bound of 32 */
 static_assert(RK_RNG_MAX_BYTE <= (TRNG_V1_RAND7 + 4 - TRNG_V1_RAND0),
 	      "You raised RK_RNG_MAX_BYTE and broke rk3588-rng, congrats.");
@@ -205,6 +229,46 @@ out:
 	return (ret < 0) ? ret : to_read;
 }
 
+static int rk3576_rng_init(struct hwrng *rng)
+{
+	struct rk_rng *rk_rng = container_of(rng, struct rk_rng, rng);
+
+	return rk_rng_enable_clks(rk_rng);
+}
+
+static int rk3576_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)
+{
+	struct rk_rng *rk_rng = container_of(rng, struct rk_rng, rng);
+	size_t to_read = min_t(size_t, max, RKRNG_READ_LEN);
+	int ret = 0;
+	u32 val;
+
+	ret = pm_runtime_resume_and_get(rk_rng->dev);
+	if (ret < 0)
+		return ret;
+
+	rk_rng_writel(rk_rng, RKRNG_CTRL_REQ_TRNG | (RKRNG_CTRL_REQ_TRNG << 16),
+		      RKRNG_CTRL);
+
+	if (readl_poll_timeout(rk_rng->base + RKRNG_STATE, val,
+			       (val & RKRNG_STATE_TRNG_RDY), RK_RNG_POLL_PERIOD_US,
+			       RK_RNG_POLL_TIMEOUT_US)) {
+		dev_err(rk_rng->dev, "timed out waiting for data\n");
+		ret = -ETIMEDOUT;
+		goto out;
+	}
+
+	rk_rng_writel(rk_rng, RKRNG_STATE_TRNG_RDY, RKRNG_STATE);
+
+	memcpy_fromio(buf, rk_rng->base + RKRNG_TRNG_DATA0, to_read);
+
+out:
+	pm_runtime_mark_last_busy(rk_rng->dev);
+	pm_runtime_put_sync_autosuspend(rk_rng->dev);
+
+	return (ret < 0) ? ret : to_read;
+}
+
 static int rk3588_rng_init(struct hwrng *rng)
 {
 	struct rk_rng *rk_rng = container_of(rng, struct rk_rng, rng);
@@ -305,6 +369,14 @@ static const struct rk_rng_soc_data rk3568_soc_data = {
 	.reset_optional = false,
 };
 
+static const struct rk_rng_soc_data rk3576_soc_data = {
+	.rk_rng_init = rk3576_rng_init,
+	.rk_rng_read = rk3576_rng_read,
+	.rk_rng_cleanup = rk3588_rng_cleanup,
+	.quality = 999,		/* as determined by actual testing */
+	.reset_optional = true,
+};
+
 static const struct rk_rng_soc_data rk3588_soc_data = {
 	.rk_rng_init = rk3588_rng_init,
 	.rk_rng_read = rk3588_rng_read,
@@ -397,6 +469,7 @@ static const struct dev_pm_ops rk_rng_pm_ops = {
 
 static const struct of_device_id rk_rng_dt_match[] = {
 	{ .compatible = "rockchip,rk3568-rng", .data = (void *)&rk3568_soc_data },
+	{ .compatible = "rockchip,rk3576-rng", .data = (void *)&rk3576_soc_data },
 	{ .compatible = "rockchip,rk3588-rng", .data = (void *)&rk3588_soc_data },
 	{ /* sentinel */ },
 };