2  * omap-rng.c - RNG driver for TI OMAP CPU family
68  * EIP76 RNG takes approx. 700us to produce 16 bytes of output data
137  * struct omap_rng_pdata - RNG IP block-specific data
163 	return __raw_readl(priv->base + priv->pdata->regs[reg]);  in omap_rng_read()
169 	__raw_writel(val, priv->base + priv->pdata->regs[reg]);  in omap_rng_write()
179 	priv = (struct omap_rng_dev *)rng->priv;  in omap_rng_do_read()
181 	if (max < priv->pdata->data_size)  in omap_rng_do_read()
185 		present = priv->pdata->data_present(priv);  in omap_rng_do_read()
194 	memcpy_fromio(data, priv->base + priv->pdata->regs[RNG_OUTPUT_0_REG],  in omap_rng_do_read()
195 		      priv->pdata->data_size);  in omap_rng_do_read()
197 	if (priv->pdata->regs[RNG_INTACK_REG])  in omap_rng_do_read()
200 	return priv->pdata->data_size;  in omap_rng_do_read()
207 	priv = (struct omap_rng_dev *)rng->priv;  in omap_rng_init()
208 	return priv->pdata->init(priv);  in omap_rng_init()
215 	priv = (struct omap_rng_dev *)rng->priv;  in omap_rng_cleanup()
216 	priv->pdata->cleanup(priv);  in omap_rng_cleanup()
259 	 *  SP 800-90 DRBG ‘BC_DF’ functionality to yield a ‘full entropy’  in eip76_rng_init()
264 	/* Number of FRO samples that are XOR-ed together into one bit to be  in eip76_rng_init()
360 			.compatible	= "ti,omap2-rng",
364 			.compatible	= "ti,omap4-rng",
368 			.compatible	= "inside-secure,safexcel-eip76",
378 	struct device *dev = &pdev->dev;  in of_get_omap_rng_device_details()
381 	priv->pdata = of_device_get_match_data(dev);  in of_get_omap_rng_device_details()
382 	if (!priv->pdata)  in of_get_omap_rng_device_details()
383 		return -ENODEV;  in of_get_omap_rng_device_details()
386 	if (of_device_is_compatible(dev->of_node, "ti,omap4-rng") ||  in of_get_omap_rng_device_details()
387 	    of_device_is_compatible(dev->of_node, "inside-secure,safexcel-eip76")) {  in of_get_omap_rng_device_details()
403 		 * such register on EIP76, and it's enabled by the  in of_get_omap_rng_device_details()
406 		if (priv->pdata->regs[RNG_INTMASK_REG])  in of_get_omap_rng_device_details()
418 	/* Only OMAP2/3 can be non-DT */  in get_omap_rng_device_details()
419 	omap_rng->pdata = &omap2_rng_pdata;  in get_omap_rng_device_details()
426 	struct device *dev = &pdev->dev;  in omap_rng_probe()
431 		return -ENOMEM;  in omap_rng_probe()
433 	priv->rng.read = omap_rng_do_read;  in omap_rng_probe()
434 	priv->rng.init = omap_rng_init;  in omap_rng_probe()
435 	priv->rng.cleanup = omap_rng_cleanup;  in omap_rng_probe()
436 	priv->rng.quality = 900;  in omap_rng_probe()
438 	priv->rng.priv = (unsigned long)priv;  in omap_rng_probe()
440 	priv->dev = dev;  in omap_rng_probe()
442 	priv->base = devm_platform_ioremap_resource(pdev, 0);  in omap_rng_probe()
443 	if (IS_ERR(priv->base)) {  in omap_rng_probe()
444 		ret = PTR_ERR(priv->base);  in omap_rng_probe()
448 	priv->rng.name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);  in omap_rng_probe()
449 	if (!priv->rng.name) {  in omap_rng_probe()
450 		ret = -ENOMEM;  in omap_rng_probe()
454 	pm_runtime_enable(&pdev->dev);  in omap_rng_probe()
455 	ret = pm_runtime_resume_and_get(&pdev->dev);  in omap_rng_probe()
457 		dev_err(&pdev->dev, "Failed to runtime_get device: %d\n", ret);  in omap_rng_probe()
461 	priv->clk = devm_clk_get(&pdev->dev, NULL);  in omap_rng_probe()
462 	if (PTR_ERR(priv->clk) == -EPROBE_DEFER)  in omap_rng_probe()
463 		return -EPROBE_DEFER;  in omap_rng_probe()
464 	if (!IS_ERR(priv->clk)) {  in omap_rng_probe()
465 		ret = clk_prepare_enable(priv->clk);  in omap_rng_probe()
467 			dev_err(&pdev->dev,  in omap_rng_probe()
473 	priv->clk_reg = devm_clk_get(&pdev->dev, "reg");  in omap_rng_probe()
474 	if (PTR_ERR(priv->clk_reg) == -EPROBE_DEFER)  in omap_rng_probe()
475 		return -EPROBE_DEFER;  in omap_rng_probe()
476 	if (!IS_ERR(priv->clk_reg)) {  in omap_rng_probe()
477 		ret = clk_prepare_enable(priv->clk_reg);  in omap_rng_probe()
479 			dev_err(&pdev->dev,  in omap_rng_probe()
486 	ret = (dev->of_node) ? of_get_omap_rng_device_details(priv, pdev) :  in omap_rng_probe()
491 	ret = devm_hwrng_register(&pdev->dev, &priv->rng);  in omap_rng_probe()
495 	dev_info(&pdev->dev, "Random Number Generator ver. %02x\n",  in omap_rng_probe()
501 	priv->base = NULL;  in omap_rng_probe()
502 	pm_runtime_put_sync(&pdev->dev);  in omap_rng_probe()
503 	pm_runtime_disable(&pdev->dev);  in omap_rng_probe()
505 	clk_disable_unprepare(priv->clk_reg);  in omap_rng_probe()
506 	clk_disable_unprepare(priv->clk);  in omap_rng_probe()
517 	priv->pdata->cleanup(priv);  in omap_rng_remove()
519 	pm_runtime_put_sync(&pdev->dev);  in omap_rng_remove()
520 	pm_runtime_disable(&pdev->dev);  in omap_rng_remove()
522 	clk_disable_unprepare(priv->clk);  in omap_rng_remove()
523 	clk_disable_unprepare(priv->clk_reg);  in omap_rng_remove()
530 	priv->pdata->cleanup(priv);  in omap_rng_suspend()
547 	priv->pdata->init(priv);  in omap_rng_resume()