4 // Based on msm-rng.c and downstream driver
6 #include <crypto/internal/rng.h>
38 	struct qcom_rng *rng;  member
43 static int qcom_rng_read(struct qcom_rng *rng, u8 *data, unsigned int max)  in qcom_rng_read()  argument
51 		ret = readl_poll_timeout(rng->base + PRNG_STATUS, val,  in qcom_rng_read()
57 		val = readl_relaxed(rng->base + PRNG_DATA_OUT);  in qcom_rng_read()
80 	struct qcom_rng *rng = ctx->rng;  in qcom_rng_generate()  local
83 	ret = clk_prepare_enable(rng->clk);  in qcom_rng_generate()
87 	mutex_lock(&rng->lock);  in qcom_rng_generate()
89 	ret = qcom_rng_read(rng, dstn, dlen);  in qcom_rng_generate()
91 	mutex_unlock(&rng->lock);  in qcom_rng_generate()
92 	clk_disable_unprepare(rng->clk);  in qcom_rng_generate()
103 static int qcom_rng_enable(struct qcom_rng *rng)  in qcom_rng_enable()  argument
108 	ret = clk_prepare_enable(rng->clk);  in qcom_rng_enable()
113 	val = readl_relaxed(rng->base + PRNG_CONFIG);  in qcom_rng_enable()
117 	val = readl_relaxed(rng->base + PRNG_LFSR_CFG);  in qcom_rng_enable()
120 	writel(val, rng->base + PRNG_LFSR_CFG);  in qcom_rng_enable()
122 	val = readl_relaxed(rng->base + PRNG_CONFIG);  in qcom_rng_enable()
124 	writel(val, rng->base + PRNG_CONFIG);  in qcom_rng_enable()
127 	clk_disable_unprepare(rng->clk);  in qcom_rng_enable()
136 	ctx->rng = qcom_rng_dev;  in qcom_rng_init()
138 	if (!ctx->rng->skip_init)  in qcom_rng_init()
139 		return qcom_rng_enable(ctx->rng);  in qcom_rng_init()
150 		.cra_driver_name	= "qcom-rng",
161 	struct qcom_rng *rng;  in qcom_rng_probe()  local
164 	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);  in qcom_rng_probe()
165 	if (!rng)  in qcom_rng_probe()
168 	platform_set_drvdata(pdev, rng);  in qcom_rng_probe()
169 	mutex_init(&rng->lock);  in qcom_rng_probe()
171 	rng->base = devm_platform_ioremap_resource(pdev, 0);  in qcom_rng_probe()
172 	if (IS_ERR(rng->base))  in qcom_rng_probe()
173 		return PTR_ERR(rng->base);  in qcom_rng_probe()
177 		rng->clk = devm_clk_get(&pdev->dev, "core");  in qcom_rng_probe()
178 		if (IS_ERR(rng->clk))  in qcom_rng_probe()
179 			return PTR_ERR(rng->clk);  in qcom_rng_probe()
183 	rng->skip_init = (unsigned long)device_get_match_data(&pdev->dev);  in qcom_rng_probe()
185 	qcom_rng_dev = rng;  in qcom_rng_probe()
188 		dev_err(&pdev->dev, "Register crypto rng failed: %d\n", ret);  in qcom_rng_probe()