1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Copyright (C) 2008-2012 Freescale Semiconductor, Inc.
79 	u32 ctrl, cmd;  in imx_rngc_irq_mask_clear()  local
82 	ctrl = readl(rngc->base + RNGC_CONTROL);  in imx_rngc_irq_mask_clear()
84 	writel(ctrl, rngc->base + RNGC_CONTROL);  in imx_rngc_irq_mask_clear()
91 	cmd = readl(rngc->base + RNGC_COMMAND);  in imx_rngc_irq_mask_clear()
92 	cmd |= RNGC_CMD_CLR_INT | RNGC_CMD_CLR_ERR;  in imx_rngc_irq_mask_clear()
93 	writel(cmd, rngc->base + RNGC_COMMAND);  in imx_rngc_irq_mask_clear()
100 	ctrl = readl(rngc->base + RNGC_CONTROL);  in imx_rngc_irq_unmask()
102 	writel(ctrl, rngc->base + RNGC_CONTROL);  in imx_rngc_irq_unmask()
107 	u32 cmd;  in imx_rngc_self_test()  local
113 	cmd = readl(rngc->base + RNGC_COMMAND);  in imx_rngc_self_test()
114 	writel(cmd | RNGC_CMD_SELF_TEST, rngc->base + RNGC_COMMAND);  in imx_rngc_self_test()
116 	ret = wait_for_completion_timeout(&rngc->rng_op_done,  in imx_rngc_self_test()
120 		return -ETIMEDOUT;  in imx_rngc_self_test()
122 	return rngc->err_reg ? -EIO : 0;  in imx_rngc_self_test()
125 static int imx_rngc_read(struct hwrng *rng, void *data, size_t max, bool wait)  in imx_rngc_read()  argument
131 	err = pm_runtime_resume_and_get(rngc->dev);  in imx_rngc_read()
135 	while (max >= sizeof(u32)) {  in imx_rngc_read()
136 		status = readl(rngc->base + RNGC_STATUS);  in imx_rngc_read()
144 			*(u32 *)data = readl(rngc->base + RNGC_FIFO);  in imx_rngc_read()
148 			max -= sizeof(u32);  in imx_rngc_read()
151 	pm_runtime_mark_last_busy(rngc->dev);  in imx_rngc_read()
152 	pm_runtime_put(rngc->dev);  in imx_rngc_read()
154 	return retval ? retval : -EIO;  in imx_rngc_read()
166 	status = readl(rngc->base + RNGC_STATUS);  in imx_rngc_irq()
167 	rngc->err_reg = readl(rngc->base + RNGC_ERROR);  in imx_rngc_irq()
172 		complete(&rngc->rng_op_done);  in imx_rngc_irq()
180 	u32 cmd, ctrl;  in imx_rngc_init()  local
183 	err = pm_runtime_resume_and_get(rngc->dev);  in imx_rngc_init()
188 	cmd = readl(rngc->base + RNGC_COMMAND);  in imx_rngc_init()
189 	writel(cmd | RNGC_CMD_CLR_ERR, rngc->base + RNGC_COMMAND);  in imx_rngc_init()
196 		cmd = readl(rngc->base + RNGC_COMMAND);  in imx_rngc_init()
197 		writel(cmd | RNGC_CMD_SEED, rngc->base + RNGC_COMMAND);  in imx_rngc_init()
199 		ret = wait_for_completion_timeout(&rngc->rng_op_done,  in imx_rngc_init()
202 			err = -ETIMEDOUT;  in imx_rngc_init()
206 	} while (rngc->err_reg == RNGC_ERROR_STATUS_STAT_ERR);  in imx_rngc_init()
208 	if (rngc->err_reg) {  in imx_rngc_init()
209 		err = -EIO;  in imx_rngc_init()
215 	 * after serving 2^20 random 160-bit words  in imx_rngc_init()
217 	ctrl = readl(rngc->base + RNGC_CONTROL);  in imx_rngc_init()
219 	writel(ctrl, rngc->base + RNGC_CONTROL);  in imx_rngc_init()
230 	pm_runtime_put(rngc->dev);  in imx_rngc_init()
239 	err = pm_runtime_resume_and_get(rngc->dev);  in imx_rngc_cleanup()
242 		pm_runtime_put(rngc->dev);  in imx_rngc_cleanup()
254 	rngc = devm_kzalloc(&pdev->dev, sizeof(*rngc), GFP_KERNEL);  in imx_rngc_probe()
256 		return -ENOMEM;  in imx_rngc_probe()
258 	rngc->base = devm_platform_ioremap_resource(pdev, 0);  in imx_rngc_probe()
259 	if (IS_ERR(rngc->base))  in imx_rngc_probe()
260 		return PTR_ERR(rngc->base);  in imx_rngc_probe()
262 	rngc->clk = devm_clk_get(&pdev->dev, NULL);  in imx_rngc_probe()
263 	if (IS_ERR(rngc->clk))  in imx_rngc_probe()
264 		return dev_err_probe(&pdev->dev, PTR_ERR(rngc->clk), "Cannot get rng_clk\n");  in imx_rngc_probe()
270 	clk_prepare_enable(rngc->clk);  in imx_rngc_probe()
272 	ver_id = readl(rngc->base + RNGC_VER_ID);  in imx_rngc_probe()
279 		clk_disable_unprepare(rngc->clk);  in imx_rngc_probe()
280 		return -ENODEV;  in imx_rngc_probe()
283 	init_completion(&rngc->rng_op_done);  in imx_rngc_probe()
285 	rngc->rng.name = pdev->name;  in imx_rngc_probe()
286 	rngc->rng.init = imx_rngc_init;  in imx_rngc_probe()
287 	rngc->rng.read = imx_rngc_read;  in imx_rngc_probe()
288 	rngc->rng.cleanup = imx_rngc_cleanup;  in imx_rngc_probe()
289 	rngc->rng.quality = 19;  in imx_rngc_probe()
291 	rngc->dev = &pdev->dev;  in imx_rngc_probe()
296 	ret = devm_request_irq(&pdev->dev,  in imx_rngc_probe()
297 			irq, imx_rngc_irq, 0, pdev->name, (void *)rngc);  in imx_rngc_probe()
299 		clk_disable_unprepare(rngc->clk);  in imx_rngc_probe()
300 		return dev_err_probe(&pdev->dev, ret, "Can't get interrupt working.\n");  in imx_rngc_probe()
306 			clk_disable_unprepare(rngc->clk);  in imx_rngc_probe()
307 			return dev_err_probe(&pdev->dev, ret, "self test failed\n");  in imx_rngc_probe()
311 	pm_runtime_set_autosuspend_delay(&pdev->dev, RNGC_PM_TIMEOUT);  in imx_rngc_probe()
312 	pm_runtime_use_autosuspend(&pdev->dev);  in imx_rngc_probe()
313 	pm_runtime_set_active(&pdev->dev);  in imx_rngc_probe()
314 	devm_pm_runtime_enable(&pdev->dev);  in imx_rngc_probe()
316 	ret = devm_hwrng_register(&pdev->dev, &rngc->rng);  in imx_rngc_probe()
318 		return dev_err_probe(&pdev->dev, ret, "hwrng registration failed\n");  in imx_rngc_probe()
320 	dev_info(&pdev->dev,  in imx_rngc_probe()
331 	clk_disable_unprepare(rngc->clk);  in imx_rngc_suspend()
340 	clk_prepare_enable(rngc->clk);  in imx_rngc_resume()
351 	{ .compatible = "fsl,imx25-rngb" },
358 		.name = KBUILD_MODNAME,