1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Copyright (C) 2008-2012 Freescale Semiconductor, Inc.
76 	u32 ctrl, cmd;  in imx_rngc_irq_mask_clear()  local
79 	ctrl = readl(rngc->base + RNGC_CONTROL);  in imx_rngc_irq_mask_clear()
81 	writel(ctrl, rngc->base + RNGC_CONTROL);  in imx_rngc_irq_mask_clear()
88 	cmd = readl(rngc->base + RNGC_COMMAND);  in imx_rngc_irq_mask_clear()
89 	cmd |= RNGC_CMD_CLR_INT | RNGC_CMD_CLR_ERR;  in imx_rngc_irq_mask_clear()
90 	writel(cmd, rngc->base + RNGC_COMMAND);  in imx_rngc_irq_mask_clear()
97 	ctrl = readl(rngc->base + RNGC_CONTROL);  in imx_rngc_irq_unmask()
99 	writel(ctrl, rngc->base + RNGC_CONTROL);  in imx_rngc_irq_unmask()
104 	u32 cmd;  in imx_rngc_self_test()  local
110 	cmd = readl(rngc->base + RNGC_COMMAND);  in imx_rngc_self_test()
111 	writel(cmd | RNGC_CMD_SELF_TEST, rngc->base + RNGC_COMMAND);  in imx_rngc_self_test()
113 	ret = wait_for_completion_timeout(&rngc->rng_op_done,  in imx_rngc_self_test()
117 		return -ETIMEDOUT;  in imx_rngc_self_test()
119 	return rngc->err_reg ? -EIO : 0;  in imx_rngc_self_test()
122 static int imx_rngc_read(struct hwrng *rng, void *data, size_t max, bool wait)  in imx_rngc_read()  argument
128 	while (max >= sizeof(u32)) {  in imx_rngc_read()
129 		status = readl(rngc->base + RNGC_STATUS);  in imx_rngc_read()
137 			*(u32 *)data = readl(rngc->base + RNGC_FIFO);  in imx_rngc_read()
141 			max -= sizeof(u32);  in imx_rngc_read()
145 	return retval ? retval : -EIO;  in imx_rngc_read()
157 	status = readl(rngc->base + RNGC_STATUS);  in imx_rngc_irq()
158 	rngc->err_reg = readl(rngc->base + RNGC_ERROR);  in imx_rngc_irq()
163 		complete(&rngc->rng_op_done);  in imx_rngc_irq()
171 	u32 cmd, ctrl;  in imx_rngc_init()  local
175 	cmd = readl(rngc->base + RNGC_COMMAND);  in imx_rngc_init()
176 	writel(cmd | RNGC_CMD_CLR_ERR, rngc->base + RNGC_COMMAND);  in imx_rngc_init()
183 		cmd = readl(rngc->base + RNGC_COMMAND);  in imx_rngc_init()
184 		writel(cmd | RNGC_CMD_SEED, rngc->base + RNGC_COMMAND);  in imx_rngc_init()
186 		ret = wait_for_completion_timeout(&rngc->rng_op_done,  in imx_rngc_init()
189 			ret = -ETIMEDOUT;  in imx_rngc_init()
193 	} while (rngc->err_reg == RNGC_ERROR_STATUS_STAT_ERR);  in imx_rngc_init()
195 	if (rngc->err_reg) {  in imx_rngc_init()
196 		ret = -EIO;  in imx_rngc_init()
202 	 * after serving 2^20 random 160-bit words  in imx_rngc_init()
204 	ctrl = readl(rngc->base + RNGC_CONTROL);  in imx_rngc_init()
206 	writel(ctrl, rngc->base + RNGC_CONTROL);  in imx_rngc_init()
235 	rngc = devm_kzalloc(&pdev->dev, sizeof(*rngc), GFP_KERNEL);  in imx_rngc_probe()
237 		return -ENOMEM;  in imx_rngc_probe()
239 	rngc->base = devm_platform_ioremap_resource(pdev, 0);  in imx_rngc_probe()
240 	if (IS_ERR(rngc->base))  in imx_rngc_probe()
241 		return PTR_ERR(rngc->base);  in imx_rngc_probe()
243 	rngc->clk = devm_clk_get_enabled(&pdev->dev, NULL);  in imx_rngc_probe()
244 	if (IS_ERR(rngc->clk))  in imx_rngc_probe()
245 		return dev_err_probe(&pdev->dev, PTR_ERR(rngc->clk), "Cannot get rng_clk\n");  in imx_rngc_probe()
251 	ver_id = readl(rngc->base + RNGC_VER_ID);  in imx_rngc_probe()
258 		return -ENODEV;  in imx_rngc_probe()
260 	init_completion(&rngc->rng_op_done);  in imx_rngc_probe()
262 	rngc->rng.name = pdev->name;  in imx_rngc_probe()
263 	rngc->rng.init = imx_rngc_init;  in imx_rngc_probe()
264 	rngc->rng.read = imx_rngc_read;  in imx_rngc_probe()
265 	rngc->rng.cleanup = imx_rngc_cleanup;  in imx_rngc_probe()
266 	rngc->rng.quality = 19;  in imx_rngc_probe()
268 	rngc->dev = &pdev->dev;  in imx_rngc_probe()
273 	ret = devm_request_irq(&pdev->dev,  in imx_rngc_probe()
274 			irq, imx_rngc_irq, 0, pdev->name, (void *)rngc);  in imx_rngc_probe()
276 		return dev_err_probe(&pdev->dev, ret, "Can't get interrupt working.\n");  in imx_rngc_probe()
281 			return dev_err_probe(&pdev->dev, ret, "self test failed\n");  in imx_rngc_probe()
284 	ret = devm_hwrng_register(&pdev->dev, &rngc->rng);  in imx_rngc_probe()
286 		return dev_err_probe(&pdev->dev, ret, "hwrng registration failed\n");  in imx_rngc_probe()
288 	dev_info(&pdev->dev,  in imx_rngc_probe()
299 	clk_disable_unprepare(rngc->clk);  in imx_rngc_suspend()
308 	clk_prepare_enable(rngc->clk);  in imx_rngc_resume()
316 	{ .compatible = "fsl,imx25-rngb" },
323 		.name = KBUILD_MODNAME,