4 // Based on msm-rng.c and downstream driver
6 #include <crypto/internal/rng.h>
39 	struct qcom_rng *rng;  member
44 static int qcom_rng_read(struct qcom_rng *rng, u8 *data, unsigned int max)  in qcom_rng_read()  argument
52 		ret = readl_poll_timeout(rng->base + PRNG_STATUS, val,  in qcom_rng_read()
58 		val = readl_relaxed(rng->base + PRNG_DATA_OUT);  in qcom_rng_read()
81 	struct qcom_rng *rng = ctx->rng;  in qcom_rng_generate()  local
84 	ret = clk_prepare_enable(rng->clk);  in qcom_rng_generate()
88 	mutex_lock(&rng->lock);  in qcom_rng_generate()
90 	ret = qcom_rng_read(rng, dstn, dlen);  in qcom_rng_generate()
92 	mutex_unlock(&rng->lock);  in qcom_rng_generate()
93 	clk_disable_unprepare(rng->clk);  in qcom_rng_generate()
104 static int qcom_rng_enable(struct qcom_rng *rng)  in qcom_rng_enable()  argument
109 	ret = clk_prepare_enable(rng->clk);  in qcom_rng_enable()
114 	val = readl_relaxed(rng->base + PRNG_CONFIG);  in qcom_rng_enable()
118 	val = readl_relaxed(rng->base + PRNG_LFSR_CFG);  in qcom_rng_enable()
121 	writel(val, rng->base + PRNG_LFSR_CFG);  in qcom_rng_enable()
123 	val = readl_relaxed(rng->base + PRNG_CONFIG);  in qcom_rng_enable()
125 	writel(val, rng->base + PRNG_CONFIG);  in qcom_rng_enable()
128 	clk_disable_unprepare(rng->clk);  in qcom_rng_enable()
137 	ctx->rng = qcom_rng_dev;  in qcom_rng_init()
139 	if (!ctx->rng->skip_init)  in qcom_rng_init()
140 		return qcom_rng_enable(ctx->rng);  in qcom_rng_init()
151 		.cra_driver_name	= "qcom-rng",
162 	struct qcom_rng *rng;  in qcom_rng_probe()  local
165 	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);  in qcom_rng_probe()
166 	if (!rng)  in qcom_rng_probe()
169 	platform_set_drvdata(pdev, rng);  in qcom_rng_probe()
170 	mutex_init(&rng->lock);  in qcom_rng_probe()
172 	rng->base = devm_platform_ioremap_resource(pdev, 0);  in qcom_rng_probe()
173 	if (IS_ERR(rng->base))  in qcom_rng_probe()
174 		return PTR_ERR(rng->base);  in qcom_rng_probe()
178 		rng->clk = devm_clk_get(&pdev->dev, "core");  in qcom_rng_probe()
179 		if (IS_ERR(rng->clk))  in qcom_rng_probe()
180 			return PTR_ERR(rng->clk);  in qcom_rng_probe()
184 	rng->skip_init = (unsigned long)device_get_match_data(&pdev->dev);  in qcom_rng_probe()
186 	qcom_rng_dev = rng;  in qcom_rng_probe()
189 		dev_err(&pdev->dev, "Register crypto rng failed: %d\n", ret);  in qcom_rng_probe()