4 // Based on msm-rng.c and downstream driver
6 #include <crypto/internal/rng.h>
43 	struct qcom_rng *rng;  member
53 static int qcom_rng_read(struct qcom_rng *rng, u8 *data, unsigned int max)  in qcom_rng_read()  argument
61 		ret = readl_poll_timeout(rng->base + PRNG_STATUS, val,  in qcom_rng_read()
67 		val = readl_relaxed(rng->base + PRNG_DATA_OUT);  in qcom_rng_read()
90 	struct qcom_rng *rng = ctx->rng;  in qcom_rng_generate()  local
93 	ret = clk_prepare_enable(rng->clk);  in qcom_rng_generate()
97 	mutex_lock(&rng->lock);  in qcom_rng_generate()
99 	ret = qcom_rng_read(rng, dstn, dlen);  in qcom_rng_generate()
101 	mutex_unlock(&rng->lock);  in qcom_rng_generate()
102 	clk_disable_unprepare(rng->clk);  in qcom_rng_generate()
123 static int qcom_rng_enable(struct qcom_rng *rng)  in qcom_rng_enable()  argument
128 	ret = clk_prepare_enable(rng->clk);  in qcom_rng_enable()
133 	val = readl_relaxed(rng->base + PRNG_CONFIG);  in qcom_rng_enable()
137 	val = readl_relaxed(rng->base + PRNG_LFSR_CFG);  in qcom_rng_enable()
140 	writel(val, rng->base + PRNG_LFSR_CFG);  in qcom_rng_enable()
142 	val = readl_relaxed(rng->base + PRNG_CONFIG);  in qcom_rng_enable()
144 	writel(val, rng->base + PRNG_CONFIG);  in qcom_rng_enable()
147 	clk_disable_unprepare(rng->clk);  in qcom_rng_enable()
156 	ctx->rng = qcom_rng_dev;  in qcom_rng_init()
158 	if (!ctx->rng->match_data->skip_init)  in qcom_rng_init()
159 		return qcom_rng_enable(ctx->rng);  in qcom_rng_init()
170 		.cra_driver_name	= "qcom-rng",
181 	struct qcom_rng *rng;  in qcom_rng_probe()  local
184 	rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL);  in qcom_rng_probe()
185 	if (!rng)  in qcom_rng_probe()
188 	platform_set_drvdata(pdev, rng);  in qcom_rng_probe()
189 	mutex_init(&rng->lock);  in qcom_rng_probe()
191 	rng->base = devm_platform_ioremap_resource(pdev, 0);  in qcom_rng_probe()
192 	if (IS_ERR(rng->base))  in qcom_rng_probe()
193 		return PTR_ERR(rng->base);  in qcom_rng_probe()
195 	rng->clk = devm_clk_get_optional(&pdev->dev, "core");  in qcom_rng_probe()
196 	if (IS_ERR(rng->clk))  in qcom_rng_probe()
197 		return PTR_ERR(rng->clk);  in qcom_rng_probe()
199 	rng->match_data = (struct qcom_rng_match_data *)device_get_match_data(&pdev->dev);  in qcom_rng_probe()
201 	qcom_rng_dev = rng;  in qcom_rng_probe()
204 		dev_err(&pdev->dev, "Register crypto rng failed: %d\n", ret);  in qcom_rng_probe()
209 	if (rng->match_data->hwrng_support) {  in qcom_rng_probe()
210 		rng->hwrng.name = "qcom_hwrng";  in qcom_rng_probe()
211 		rng->hwrng.read = qcom_hwrng_read;  in qcom_rng_probe()
212 		rng->hwrng.quality = QCOM_TRNG_QUALITY;  in qcom_rng_probe()
213 		ret = devm_hwrng_register(&pdev->dev, &rng->hwrng);  in qcom_rng_probe()