1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Copyright (C) 2008-2012 Freescale Semiconductor, Inc.
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()
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()
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, RNGC_TIMEOUT);  in imx_rngc_self_test()
116 		return -ETIMEDOUT;  in imx_rngc_self_test()
118 	return rngc->err_reg ? -EIO : 0;  in imx_rngc_self_test()
129 		status = readl(rngc->base + RNGC_STATUS);  in imx_rngc_read()
135 		/* how many random numbers are in FIFO? [0-16] */  in imx_rngc_read()
141 			*(u32 *)data = readl(rngc->base + RNGC_FIFO);  in imx_rngc_read()
145 			max -= sizeof(u32);  in imx_rngc_read()
149 	return retval ? retval : -EIO;  in imx_rngc_read()
161 	status = readl(rngc->base + RNGC_STATUS);  in imx_rngc_irq()
162 	rngc->err_reg = readl(rngc->base + RNGC_ERROR);  in imx_rngc_irq()
167 		complete(&rngc->rng_op_done);  in imx_rngc_irq()
179 	cmd = readl(rngc->base + RNGC_COMMAND);  in imx_rngc_init()
180 	writel(cmd | RNGC_CMD_CLR_ERR, rngc->base + RNGC_COMMAND);  in imx_rngc_init()
187 		cmd = readl(rngc->base + RNGC_COMMAND);  in imx_rngc_init()
188 		writel(cmd | RNGC_CMD_SEED, rngc->base + RNGC_COMMAND);  in imx_rngc_init()
190 		ret = wait_for_completion_timeout(&rngc->rng_op_done,  in imx_rngc_init()
194 			ret = -ETIMEDOUT;  in imx_rngc_init()
198 	} while (rngc->err_reg == RNGC_ERROR_STATUS_STAT_ERR);  in imx_rngc_init()
200 	if (rngc->err_reg) {  in imx_rngc_init()
201 		ret = -EIO;  in imx_rngc_init()
207 	 * after serving 2^20 random 160-bit words  in imx_rngc_init()
209 	ctrl = readl(rngc->base + RNGC_CONTROL);  in imx_rngc_init()
211 	writel(ctrl, rngc->base + RNGC_CONTROL);  in imx_rngc_init()
240 	rngc = devm_kzalloc(&pdev->dev, sizeof(*rngc), GFP_KERNEL);  in imx_rngc_probe()
242 		return -ENOMEM;  in imx_rngc_probe()
244 	rngc->base = devm_platform_ioremap_resource(pdev, 0);  in imx_rngc_probe()
245 	if (IS_ERR(rngc->base))  in imx_rngc_probe()
246 		return PTR_ERR(rngc->base);  in imx_rngc_probe()
248 	rngc->clk = devm_clk_get(&pdev->dev, NULL);  in imx_rngc_probe()
249 	if (IS_ERR(rngc->clk)) {  in imx_rngc_probe()
250 		dev_err(&pdev->dev, "Can not get rng_clk\n");  in imx_rngc_probe()
251 		return PTR_ERR(rngc->clk);  in imx_rngc_probe()
256 		dev_err(&pdev->dev, "Couldn't get irq %d\n", irq);  in imx_rngc_probe()
260 	ret = clk_prepare_enable(rngc->clk);  in imx_rngc_probe()
264 	ver_id = readl(rngc->base + RNGC_VER_ID);  in imx_rngc_probe()
267 	 * This driver supports only RNGC and RNGB. (There's a different  in imx_rngc_probe()
271 		ret = -ENODEV;  in imx_rngc_probe()
275 	ret = devm_request_irq(&pdev->dev,  in imx_rngc_probe()
276 			irq, imx_rngc_irq, 0, pdev->name, (void *)rngc);  in imx_rngc_probe()
278 		dev_err(rngc->dev, "Can't get interrupt working.\n");  in imx_rngc_probe()
282 	init_completion(&rngc->rng_op_done);  in imx_rngc_probe()
284 	rngc->rng.name = pdev->name;  in imx_rngc_probe()
285 	rngc->rng.init = imx_rngc_init;  in imx_rngc_probe()
286 	rngc->rng.read = imx_rngc_read;  in imx_rngc_probe()
287 	rngc->rng.cleanup = imx_rngc_cleanup;  in imx_rngc_probe()
288 	rngc->rng.quality = 19;  in imx_rngc_probe()
290 	rngc->dev = &pdev->dev;  in imx_rngc_probe()
298 			dev_err(rngc->dev, "self test failed\n");  in imx_rngc_probe()
303 	ret = hwrng_register(&rngc->rng);  in imx_rngc_probe()
305 		dev_err(&pdev->dev, "hwrng registration failed\n");  in imx_rngc_probe()
309 	dev_info(&pdev->dev,  in imx_rngc_probe()
316 	clk_disable_unprepare(rngc->clk);  in imx_rngc_probe()
325 	hwrng_unregister(&rngc->rng);  in imx_rngc_remove()
327 	clk_disable_unprepare(rngc->clk);  in imx_rngc_remove()
336 	clk_disable_unprepare(rngc->clk);  in imx_rngc_suspend()
345 	clk_prepare_enable(rngc->clk);  in imx_rngc_resume()
353 	{ .compatible = "fsl,imx25-rngb", .data = NULL, },