linux-imx

/*

 * RNG driver for AMD Geode RNGs

 *

 * Copyright 2005 (c) MontaVista Software, Inc.

 *

 * with the majority of the code coming from:

 *

 * Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG)

 * (c) Copyright 2003 Red Hat Inc <jgarzik@redhat.com>

 *

 * derived from

 *

 * Hardware driver for the AMD 768 Random Number Generator (RNG)

 * (c) Copyright 2001 Red Hat Inc

 *

 * derived from

 *

 * Hardware driver for Intel i810 Random Number Generator (RNG)

 * Copyright 2000,2001 Jeff Garzik <jgarzik@pobox.com>

 * Copyright 2000,2001 Philipp Rumpf <prumpf@mandrakesoft.com>

 *

 * This file is licensed under  the terms of the GNU General Public

 * License version 2. This program is licensed "as is" without any

 * warranty of any kind, whether express or implied.

 */

​

#include <linux/delay.h>

#include <linux/hw_random.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/pci.h>

​

​

#define PFX KBUILD_MODNAME ": "

​

#define GEODE_RNG_DATA_REG   0x50

#define GEODE_RNG_STATUS_REG 0x54

​

/*

 * Data for PCI driver interface

 *

 * This data only exists for exporting the supported

 * PCI ids via MODULE_DEVICE_TABLE.  We do not actually

 * register a pci_driver, because someone else might one day

 * want to register another driver on the same PCI id.

 */

static const struct pci_device_id pci_tbl[] = {

    { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), 0, },

    { 0, }, /* terminate list */

};

MODULE_DEVICE_TABLE(pci, pci_tbl);

​

​

static int geode_rng_data_read(struct hwrng *rng, u32 *data)

{

    void __iomem *mem = (void __iomem *)rng->priv;

​

    *data = readl(mem + GEODE_RNG_DATA_REG);

​

    return 4;

}

​