2  * omap-rng.c - RNG driver for TI OMAP CPU family
71  * EIP76 RNG takes approx. 700us to produce 16 bytes of output data
140  * struct omap_rng_pdata - RNG IP block-specific data
166 	return __raw_readl(priv->base + priv->pdata->regs[reg]);  in omap_rng_read()
172 	__raw_writel(val, priv->base + priv->pdata->regs[reg]);  in omap_rng_write()
182 	priv = (struct omap_rng_dev *)rng->priv;  in omap_rng_do_read()
184 	if (max < priv->pdata->data_size)  in omap_rng_do_read()
188 		present = priv->pdata->data_present(priv);  in omap_rng_do_read()
197 	memcpy_fromio(data, priv->base + priv->pdata->regs[RNG_OUTPUT_0_REG],  in omap_rng_do_read()
198 		      priv->pdata->data_size);  in omap_rng_do_read()
200 	if (priv->pdata->regs[RNG_INTACK_REG])  in omap_rng_do_read()
203 	return priv->pdata->data_size;  in omap_rng_do_read()
210 	priv = (struct omap_rng_dev *)rng->priv;  in omap_rng_init()
211 	return priv->pdata->init(priv);  in omap_rng_init()
218 	priv = (struct omap_rng_dev *)rng->priv;  in omap_rng_cleanup()
219 	priv->pdata->cleanup(priv);  in omap_rng_cleanup()
262 	 *  SP 800-90 DRBG ‘BC_DF’ functionality to yield a ‘full entropy’  in eip76_rng_init()
267 	/* Number of FRO samples that are XOR-ed together into one bit to be  in eip76_rng_init()
363 			.compatible	= "ti,omap2-rng",
367 			.compatible	= "ti,omap4-rng",
371 			.compatible	= "inside-secure,safexcel-eip76",
382 	struct device *dev = &pdev->dev;  in of_get_omap_rng_device_details()
388 		return -EINVAL;  in of_get_omap_rng_device_details()
390 	priv->pdata = match->data;  in of_get_omap_rng_device_details()
392 	if (of_device_is_compatible(dev->of_node, "ti,omap4-rng") ||  in of_get_omap_rng_device_details()
393 	    of_device_is_compatible(dev->of_node, "inside-secure,safexcel-eip76")) {  in of_get_omap_rng_device_details()
409 		 * such register on EIP76, and it's enabled by the  in of_get_omap_rng_device_details()
412 		if (priv->pdata->regs[RNG_INTMASK_REG])  in of_get_omap_rng_device_details()
424 	/* Only OMAP2/3 can be non-DT */  in get_omap_rng_device_details()
425 	omap_rng->pdata = &omap2_rng_pdata;  in get_omap_rng_device_details()
432 	struct device *dev = &pdev->dev;  in omap_rng_probe()
437 		return -ENOMEM;  in omap_rng_probe()
439 	priv->rng.read = omap_rng_do_read;  in omap_rng_probe()
440 	priv->rng.init = omap_rng_init;  in omap_rng_probe()
441 	priv->rng.cleanup = omap_rng_cleanup;  in omap_rng_probe()
442 	priv->rng.quality = 900;  in omap_rng_probe()
444 	priv->rng.priv = (unsigned long)priv;  in omap_rng_probe()
446 	priv->dev = dev;  in omap_rng_probe()
448 	priv->base = devm_platform_ioremap_resource(pdev, 0);  in omap_rng_probe()
449 	if (IS_ERR(priv->base)) {  in omap_rng_probe()
450 		ret = PTR_ERR(priv->base);  in omap_rng_probe()
454 	priv->rng.name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);  in omap_rng_probe()
455 	if (!priv->rng.name) {  in omap_rng_probe()
456 		ret = -ENOMEM;  in omap_rng_probe()
460 	pm_runtime_enable(&pdev->dev);  in omap_rng_probe()
461 	ret = pm_runtime_get_sync(&pdev->dev);  in omap_rng_probe()
463 		dev_err(&pdev->dev, "Failed to runtime_get device: %d\n", ret);  in omap_rng_probe()
464 		pm_runtime_put_noidle(&pdev->dev);  in omap_rng_probe()
468 	priv->clk = devm_clk_get(&pdev->dev, NULL);  in omap_rng_probe()
469 	if (PTR_ERR(priv->clk) == -EPROBE_DEFER)  in omap_rng_probe()
470 		return -EPROBE_DEFER;  in omap_rng_probe()
471 	if (!IS_ERR(priv->clk)) {  in omap_rng_probe()
472 		ret = clk_prepare_enable(priv->clk);  in omap_rng_probe()
474 			dev_err(&pdev->dev,  in omap_rng_probe()
480 	priv->clk_reg = devm_clk_get(&pdev->dev, "reg");  in omap_rng_probe()
481 	if (PTR_ERR(priv->clk_reg) == -EPROBE_DEFER)  in omap_rng_probe()
482 		return -EPROBE_DEFER;  in omap_rng_probe()
483 	if (!IS_ERR(priv->clk_reg)) {  in omap_rng_probe()
484 		ret = clk_prepare_enable(priv->clk_reg);  in omap_rng_probe()
486 			dev_err(&pdev->dev,  in omap_rng_probe()
493 	ret = (dev->of_node) ? of_get_omap_rng_device_details(priv, pdev) :  in omap_rng_probe()
498 	ret = devm_hwrng_register(&pdev->dev, &priv->rng);  in omap_rng_probe()
502 	dev_info(&pdev->dev, "Random Number Generator ver. %02x\n",  in omap_rng_probe()
508 	priv->base = NULL;  in omap_rng_probe()
509 	pm_runtime_put_sync(&pdev->dev);  in omap_rng_probe()
510 	pm_runtime_disable(&pdev->dev);  in omap_rng_probe()
512 	clk_disable_unprepare(priv->clk_reg);  in omap_rng_probe()
513 	clk_disable_unprepare(priv->clk);  in omap_rng_probe()
524 	priv->pdata->cleanup(priv);  in omap_rng_remove()
526 	pm_runtime_put_sync(&pdev->dev);  in omap_rng_remove()
527 	pm_runtime_disable(&pdev->dev);  in omap_rng_remove()
529 	clk_disable_unprepare(priv->clk);  in omap_rng_remove()
530 	clk_disable_unprepare(priv->clk_reg);  in omap_rng_remove()
539 	priv->pdata->cleanup(priv);  in omap_rng_suspend()
557 	priv->pdata->init(priv);  in omap_rng_resume()