1 // SPDX-License-Identifier: GPL-2.0-or-later
10 #include <linux/delay.h>
21 /* Runtime PM autosuspend timeout: */
47 	err = clk_prepare_enable(priv->clk);  in mtk_rng_init()
51 	val = readl(priv->base + RNG_CTRL);  in mtk_rng_init()
53 	writel(val, priv->base + RNG_CTRL);  in mtk_rng_init()
63 	val = readl(priv->base + RNG_CTRL);  in mtk_rng_cleanup()
65 	writel(val, priv->base + RNG_CTRL);  in mtk_rng_cleanup()
67 	clk_disable_unprepare(priv->clk);  in mtk_rng_cleanup()
75 	ready = readl(priv->base + RNG_CTRL) & RNG_READY;  in mtk_rng_wait_ready()
77 		readl_poll_timeout_atomic(priv->base + RNG_CTRL, ready,  in mtk_rng_wait_ready()
88 	pm_runtime_get_sync((struct device *)priv->rng.priv);  in mtk_rng_read()
94 		*(u32 *)buf = readl(priv->base + RNG_DATA);  in mtk_rng_read()
97 		max -= sizeof(u32);  in mtk_rng_read()
100 	pm_runtime_mark_last_busy((struct device *)priv->rng.priv);  in mtk_rng_read()
101 	pm_runtime_put_sync_autosuspend((struct device *)priv->rng.priv);  in mtk_rng_read()
103 	return retval || !wait ? retval : -EIO;  in mtk_rng_read()
114 		dev_err(&pdev->dev, "no iomem resource\n");  in mtk_rng_probe()
115 		return -ENXIO;  in mtk_rng_probe()
118 	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);  in mtk_rng_probe()
120 		return -ENOMEM;  in mtk_rng_probe()
122 	priv->rng.name = pdev->name;  in mtk_rng_probe()
124 	priv->rng.init = mtk_rng_init;  in mtk_rng_probe()
125 	priv->rng.cleanup = mtk_rng_cleanup;  in mtk_rng_probe()
127 	priv->rng.read = mtk_rng_read;  in mtk_rng_probe()
128 	priv->rng.priv = (unsigned long)&pdev->dev;  in mtk_rng_probe()
129 	priv->rng.quality = 900;  in mtk_rng_probe()
131 	priv->clk = devm_clk_get(&pdev->dev, "rng");  in mtk_rng_probe()
132 	if (IS_ERR(priv->clk)) {  in mtk_rng_probe()
133 		ret = PTR_ERR(priv->clk);  in mtk_rng_probe()
134 		dev_err(&pdev->dev, "no clock for device: %d\n", ret);  in mtk_rng_probe()
138 	priv->base = devm_ioremap_resource(&pdev->dev, res);  in mtk_rng_probe()
139 	if (IS_ERR(priv->base))  in mtk_rng_probe()
140 		return PTR_ERR(priv->base);  in mtk_rng_probe()
142 	ret = devm_hwrng_register(&pdev->dev, &priv->rng);  in mtk_rng_probe()
144 		dev_err(&pdev->dev, "failed to register rng device: %d\n",  in mtk_rng_probe()
149 	dev_set_drvdata(&pdev->dev, priv);  in mtk_rng_probe()
150 	pm_runtime_set_autosuspend_delay(&pdev->dev, RNG_AUTOSUSPEND_TIMEOUT);  in mtk_rng_probe()
151 	pm_runtime_use_autosuspend(&pdev->dev);  in mtk_rng_probe()
152 	pm_runtime_enable(&pdev->dev);  in mtk_rng_probe()
154 	dev_info(&pdev->dev, "registered RNG driver\n");  in mtk_rng_probe()
164 	mtk_rng_cleanup(&priv->rng);  in mtk_rng_runtime_suspend()
173 	return mtk_rng_init(&priv->rng);  in mtk_rng_runtime_resume()
184 	{ .compatible = "mediatek,mt7623-rng" },