1 // SPDX-License-Identifier: GPL-2.0-only
3  * Generic PowerPC 44x RNG driver
28 static int ppc4xx_trng_data_present(struct hwrng *rng, int wait)  in ppc4xx_trng_data_present()  argument
30 	struct crypto4xx_device *dev = (void *)rng->priv;  in ppc4xx_trng_data_present()
34 		busy = (in_le32(dev->trng_base + PPC4XX_TRNG_STAT) &  in ppc4xx_trng_data_present()
45 static int ppc4xx_trng_data_read(struct hwrng *rng, u32 *data)  in ppc4xx_trng_data_read()  argument
47 	struct crypto4xx_device *dev = (void *)rng->priv;  in ppc4xx_trng_data_read()
48 	*data = in_le32(dev->trng_base + PPC4XX_TRNG_DATA);  in ppc4xx_trng_data_read()
56 	device_ctrl = readl(dev->ce_base + CRYPTO4XX_DEVICE_CTRL);  in ppc4xx_trng_enable()
61 	writel(device_ctrl, dev->ce_base + CRYPTO4XX_DEVICE_CTRL);  in ppc4xx_trng_enable()
65 	{ .compatible = "ppc4xx-rng", },
66 	{ .compatible = "amcc,ppc460ex-rng", },
67 	{ .compatible = "amcc,ppc440epx-rng", },
73 	struct crypto4xx_device *dev = core_dev->dev;  in ppc4xx_trng_probe()
75 	struct hwrng *rng = NULL;  in ppc4xx_trng_probe()  local
85 	dev->trng_base = of_iomap(trng, 0);  in ppc4xx_trng_probe()
87 	if (!dev->trng_base)  in ppc4xx_trng_probe()
90 	rng = kzalloc(sizeof(*rng), GFP_KERNEL);  in ppc4xx_trng_probe()
91 	if (!rng)  in ppc4xx_trng_probe()
94 	rng->name = KBUILD_MODNAME;  in ppc4xx_trng_probe()
95 	rng->data_present = ppc4xx_trng_data_present;  in ppc4xx_trng_probe()
96 	rng->data_read = ppc4xx_trng_data_read;  in ppc4xx_trng_probe()
97 	rng->priv = (unsigned long) dev;  in ppc4xx_trng_probe()
98 	core_dev->trng = rng;  in ppc4xx_trng_probe()
100 	out_le32(dev->trng_base + PPC4XX_TRNG_CTRL, PPC4XX_TRNG_CTRL_DALM);  in ppc4xx_trng_probe()
101 	err = devm_hwrng_register(core_dev->device, core_dev->trng);  in ppc4xx_trng_probe()
104 		dev_err(core_dev->device, "failed to register hwrng (%d).\n",  in ppc4xx_trng_probe()
111 	iounmap(dev->trng_base);  in ppc4xx_trng_probe()
112 	kfree(rng);  in ppc4xx_trng_probe()
113 	dev->trng_base = NULL;  in ppc4xx_trng_probe()
114 	core_dev->trng = NULL;  in ppc4xx_trng_probe()
119 	if (core_dev && core_dev->trng) {  in ppc4xx_trng_remove()
120 		struct crypto4xx_device *dev = core_dev->dev;  in ppc4xx_trng_remove()
122 		devm_hwrng_unregister(core_dev->device, core_dev->trng);  in ppc4xx_trng_remove()
124 		iounmap(dev->trng_base);  in ppc4xx_trng_remove()
125 		kfree(core_dev->trng);  in ppc4xx_trng_remove()