2  * omap3-rom-rng.c - RNG driver for TI OMAP3 CPU family
37 static int omap3_rom_rng_read(struct hwrng *rng, void *data, size_t max, bool w)  in omap3_rom_rng_read()  argument
43 	ddata = (struct omap_rom_rng *)rng->priv;  in omap3_rom_rng_read()
45 	r = pm_runtime_get_sync(ddata->dev);  in omap3_rom_rng_read()
47 		pm_runtime_put_noidle(ddata->dev);  in omap3_rom_rng_read()
53 	r = ddata->rom_rng_call(ptr, 4, RNG_GEN_HW);  in omap3_rom_rng_read()
55 		r = -EINVAL;  in omap3_rom_rng_read()
59 	pm_runtime_mark_last_busy(ddata->dev);  in omap3_rom_rng_read()
60 	pm_runtime_put_autosuspend(ddata->dev);  in omap3_rom_rng_read()
72 	r = ddata->rom_rng_call(0, 0, RNG_RESET);  in omap_rom_rng_runtime_suspend()
76 	clk_disable_unprepare(ddata->clk);  in omap_rom_rng_runtime_suspend()
88 	r = clk_prepare_enable(ddata->clk);  in omap_rom_rng_runtime_resume()
92 	r = ddata->rom_rng_call(0, 0, RNG_GEN_PRNG_HW_INIT);  in omap_rom_rng_runtime_resume()
94 		clk_disable_unprepare(ddata->clk);  in omap_rom_rng_runtime_resume()
97 		return -EIO;  in omap_rom_rng_runtime_resume()
107 	pm_runtime_dont_use_autosuspend(ddata->dev);  in omap_rom_rng_finish()
108 	pm_runtime_disable(ddata->dev);  in omap_rom_rng_finish()
116 	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);  in omap3_rom_rng_probe()
118 		return -ENOMEM;  in omap3_rom_rng_probe()
120 	ddata->dev = &pdev->dev;  in omap3_rom_rng_probe()
121 	ddata->ops.priv = (unsigned long)ddata;  in omap3_rom_rng_probe()
122 	ddata->ops.name = "omap3-rom";  in omap3_rom_rng_probe()
123 	ddata->ops.read = of_device_get_match_data(&pdev->dev);  in omap3_rom_rng_probe()
124 	ddata->ops.quality = 900;  in omap3_rom_rng_probe()
125 	if (!ddata->ops.read) {  in omap3_rom_rng_probe()
126 		dev_err(&pdev->dev, "missing rom code handler\n");  in omap3_rom_rng_probe()
128 		return -ENODEV;  in omap3_rom_rng_probe()
130 	dev_set_drvdata(ddata->dev, ddata);  in omap3_rom_rng_probe()
132 	ddata->rom_rng_call = pdev->dev.platform_data;  in omap3_rom_rng_probe()
133 	if (!ddata->rom_rng_call) {  in omap3_rom_rng_probe()
134 		dev_err(ddata->dev, "rom_rng_call is NULL\n");  in omap3_rom_rng_probe()
135 		return -EINVAL;  in omap3_rom_rng_probe()
138 	ddata->clk = devm_clk_get(ddata->dev, "ick");  in omap3_rom_rng_probe()
139 	if (IS_ERR(ddata->clk)) {  in omap3_rom_rng_probe()
140 		dev_err(ddata->dev, "unable to get RNG clock\n");  in omap3_rom_rng_probe()
141 		return PTR_ERR(ddata->clk);  in omap3_rom_rng_probe()
144 	pm_runtime_enable(&pdev->dev);  in omap3_rom_rng_probe()
145 	pm_runtime_set_autosuspend_delay(&pdev->dev, 500);  in omap3_rom_rng_probe()
146 	pm_runtime_use_autosuspend(&pdev->dev);  in omap3_rom_rng_probe()
148 	ret = devm_add_action_or_reset(ddata->dev, omap_rom_rng_finish,  in omap3_rom_rng_probe()
153 	return devm_hwrng_register(ddata->dev, &ddata->ops);  in omap3_rom_rng_probe()
157 	{ .compatible = "nokia,n900-rom-rng", .data = omap3_rom_rng_read, },
169 		.name		= "omap3-rom-rng",
178 MODULE_ALIAS("platform:omap3-rom-rng");
181 MODULE_DESCRIPTION("RNG driver for TI OMAP3 CPU family");