2  * RNG driver for AMD RNGs
8  * Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG)
13  * Hardware driver for the AMD 768 Random Number Generator (RNG)
18  * Hardware driver for Intel i810 Random Number Generator (RNG)
34 #define DRV_NAME "AMD768-HWRNG"
62 static int amd_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait)  in amd_rng_read()  argument
65 	struct amd768_priv *priv = (struct amd768_priv *)rng->priv;  in amd_rng_read()
71 	 * RNG data is available when RNGDONE is set to 1  in amd_rng_read()
76 		if (ioread32(priv->iobase + RNGDONE) == 0) {  in amd_rng_read()
80 				if (timeout-- == 0)  in amd_rng_read()
86 			*data = ioread32(priv->iobase + RNGDATA);  in amd_rng_read()
95 static int amd_rng_init(struct hwrng *rng)  in amd_rng_init()  argument
97 	struct amd768_priv *priv = (struct amd768_priv *)rng->priv;  in amd_rng_init()
100 	pci_read_config_byte(priv->pcidev, 0x40, &rnen);  in amd_rng_init()
101 	rnen |= BIT(7);	/* RNG on */  in amd_rng_init()
102 	pci_write_config_byte(priv->pcidev, 0x40, rnen);  in amd_rng_init()
104 	pci_read_config_byte(priv->pcidev, 0x41, &rnen);  in amd_rng_init()
106 	pci_write_config_byte(priv->pcidev, 0x41, rnen);  in amd_rng_init()
111 static void amd_rng_cleanup(struct hwrng *rng)  in amd_rng_cleanup()  argument
113 	struct amd768_priv *priv = (struct amd768_priv *)rng->priv;  in amd_rng_cleanup()
116 	pci_read_config_byte(priv->pcidev, 0x40, &rnen);  in amd_rng_cleanup()
117 	rnen &= ~BIT(7);	/* RNG off */  in amd_rng_cleanup()
118 	pci_write_config_byte(priv->pcidev, 0x40, rnen);  in amd_rng_cleanup()
142 	return -ENODEV;  in amd_rng_mod_init()
153 		err = -EIO;  in amd_rng_mod_init()
159 		err = -ENOMEM;  in amd_rng_mod_init()
164 		dev_err(&pdev->dev, DRV_NAME " region 0x%x already in use!\n",  in amd_rng_mod_init()
166 		err = -EBUSY;  in amd_rng_mod_init()
170 	priv->iobase = ioport_map(pmbase + PMBASE_OFFSET, PMBASE_SIZE);  in amd_rng_mod_init()
171 	if (!priv->iobase) {  in amd_rng_mod_init()
173 		err = -EINVAL;  in amd_rng_mod_init()
178 	priv->pmbase = pmbase;  in amd_rng_mod_init()
179 	priv->pcidev = pdev;  in amd_rng_mod_init()
190 	ioport_unmap(priv->iobase);  in amd_rng_mod_init()
208 	ioport_unmap(priv->iobase);  in amd_rng_mod_exit()
210 	release_region(priv->pmbase + PMBASE_OFFSET, PMBASE_SIZE);  in amd_rng_mod_exit()
212 	pci_dev_put(priv->pcidev);  in amd_rng_mod_exit()
221 MODULE_DESCRIPTION("H/W RNG driver for AMD chipsets");