1 // SPDX-License-Identifier: GPL-2.0-only
5  * Copyright (C) 2016 Texas Instruments Incorporated - https://www.ti.com
20 #include <linux/mfd/syscon.h>
28 /* TRNG enable control in SA System module*/
116 	struct device *dev = (struct device *)rng->priv;  in ks_sa_rng_init()
118 	unsigned long clk_rate = clk_get_rate(ks_sa_rng->clk);  in ks_sa_rng_init()
121 	regmap_write_bits(ks_sa_rng->regmap_cfg, SA_CMD_STATUS_OFS,  in ks_sa_rng_init()
126 	writel(0, &ks_sa_rng->reg_rng->control);  in ks_sa_rng_init()
128 	writel(value, &ks_sa_rng->reg_rng->control);  in ks_sa_rng_init()
137 	writel(value, &ks_sa_rng->reg_rng->config);  in ks_sa_rng_init()
140 	writel(0, &ks_sa_rng->reg_rng->intmask);  in ks_sa_rng_init()
143 	value = readl(&ks_sa_rng->reg_rng->control);  in ks_sa_rng_init()
145 	writel(value, &ks_sa_rng->reg_rng->control);  in ks_sa_rng_init()
147 	ks_sa_rng->refill_delay_ns = refill_delay_ns(clk_rate);  in ks_sa_rng_init()
148 	ks_sa_rng->ready_ts = ktime_get_ns() +  in ks_sa_rng_init()
156 	struct device *dev = (struct device *)rng->priv;  in ks_sa_rng_cleanup()
160 	writel(0, &ks_sa_rng->reg_rng->control);  in ks_sa_rng_cleanup()
161 	regmap_write_bits(ks_sa_rng->regmap_cfg, SA_CMD_STATUS_OFS,  in ks_sa_rng_cleanup()
167 	struct device *dev = (struct device *)rng->priv;  in ks_sa_rng_data_read()
171 	data[0] = readl(&ks_sa_rng->reg_rng->output_l);  in ks_sa_rng_data_read()
172 	data[1] = readl(&ks_sa_rng->reg_rng->output_h);  in ks_sa_rng_data_read()
174 	writel(TRNG_INTACK_REG_READY, &ks_sa_rng->reg_rng->intack);  in ks_sa_rng_data_read()
175 	ks_sa_rng->ready_ts = ktime_get_ns() + ks_sa_rng->refill_delay_ns;  in ks_sa_rng_data_read()
182 	struct device *dev = (struct device *)rng->priv;  in ks_sa_rng_data_present()
189 	if (wait && now < ks_sa_rng->ready_ts) {  in ks_sa_rng_data_present()
192 			DIV_ROUND_UP((u32)(ks_sa_rng->ready_ts - now), 1000);  in ks_sa_rng_data_present()
198 		ready = readl(&ks_sa_rng->reg_rng->status);  in ks_sa_rng_data_present()
213 	struct device		*dev = &pdev->dev;  in ks_sa_rng_probe()
218 		return -ENOMEM;  in ks_sa_rng_probe()
220 	ks_sa_rng->dev = dev;  in ks_sa_rng_probe()
221 	ks_sa_rng->rng = (struct hwrng) {  in ks_sa_rng_probe()
228 	ks_sa_rng->rng.priv = (unsigned long)dev;  in ks_sa_rng_probe()
230 	ks_sa_rng->reg_rng = devm_platform_ioremap_resource(pdev, 0);  in ks_sa_rng_probe()
231 	if (IS_ERR(ks_sa_rng->reg_rng))  in ks_sa_rng_probe()
232 		return PTR_ERR(ks_sa_rng->reg_rng);  in ks_sa_rng_probe()
234 	ks_sa_rng->regmap_cfg =  in ks_sa_rng_probe()
235 		syscon_regmap_lookup_by_phandle(dev->of_node,  in ks_sa_rng_probe()
236 						"ti,syscon-sa-cfg");  in ks_sa_rng_probe()
238 	if (IS_ERR(ks_sa_rng->regmap_cfg)) {  in ks_sa_rng_probe()
240 		return -EINVAL;  in ks_sa_rng_probe()
246 		dev_err(dev, "Failed to enable SA power-domain\n");  in ks_sa_rng_probe()
253 	return devm_hwrng_register(&pdev->dev, &ks_sa_rng->rng);  in ks_sa_rng_probe()
258 	pm_runtime_put_sync(&pdev->dev);  in ks_sa_rng_remove()
259 	pm_runtime_disable(&pdev->dev);  in ks_sa_rng_remove()
266 		.compatible = "ti,keystone-rng",
274 		.name	= "ks-sa-rng",
283 MODULE_DESCRIPTION("Keystone NETCP SA H/W Random Number Generator driver");