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    Subject[patch 5/9] Add Geode HW RNG driver
    Signed-off-by: Michael Buesch <mb@bu3sch.de>
    Index: hwrng/drivers/char/hw_random/Kconfig
    ===================================================================
    --- hwrng.orig/drivers/char/hw_random/Kconfig 2006-05-08 00:11:59.000000000 +0200
    +++ hwrng/drivers/char/hw_random/Kconfig 2006-05-08 00:12:08.000000000 +0200
    @@ -35,3 +35,16 @@
    module will be called amd-rng.

    If unsure, say Y.
    +
    +config HW_RANDOM_GEODE
    + tristate "AMD Geode HW Random Number Generator support"
    + depends on HW_RANDOM && (X86 || IA64) && PCI
    + default y
    + ---help---
    + This driver provides kernel-side support for the Random Number
    + Generator hardware found on AMD Geode based motherboards.
    +
    + To compile this driver as a module, choose M here: the
    + module will be called geode-rng.
    +
    + If unsure, say Y.
    Index: hwrng/drivers/char/hw_random/Makefile
    ===================================================================
    --- hwrng.orig/drivers/char/hw_random/Makefile 2006-05-08 00:11:52.000000000 +0200
    +++ hwrng/drivers/char/hw_random/Makefile 2006-05-08 00:12:03.000000000 +0200
    @@ -5,3 +5,4 @@
    obj-$(CONFIG_HW_RANDOM) += core.o
    obj-$(CONFIG_HW_RANDOM_INTEL) += intel-rng.o
    obj-$(CONFIG_HW_RANDOM_AMD) += amd-rng.o
    +obj-$(CONFIG_HW_RANDOM_GEODE) += geode-rng.o
    Index: hwrng/drivers/char/hw_random/geode-rng.c
    ===================================================================
    --- /dev/null 1970-01-01 00:00:00.000000000 +0000
    +++ hwrng/drivers/char/hw_random/geode-rng.c 2006-05-08 00:12:03.000000000 +0200
    @@ -0,0 +1,129 @@
    +/*
    + * 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 <alan@redhat.com>
    + *
    + * 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/module.h>
    +#include <linux/kernel.h>
    +#include <linux/pci.h>
    +#include <linux/hw_random.h>
    +#include <asm/io.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 struct pci_device_id pci_tbl[] = {
    + { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LX_AES,
    + PCI_ANY_ID, PCI_ANY_ID, 0, 0, 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;
    +}
    +
    +static int geode_rng_data_present(struct hwrng *rng)
    +{
    + void __iomem *mem = (void __iomem *)rng->priv;
    +
    + return !!(readl(mem + GEODE_RNG_STATUS_REG));
    +}
    +
    +
    +static struct hwrng geode_rng = {
    + .name = "geode",
    + .data_present = geode_rng_data_present,
    + .data_read = geode_rng_data_read,
    +};
    +
    +
    +static int __init mod_init(void)
    +{
    + int err = -ENODEV;
    + struct pci_dev *pdev = NULL;
    + const struct pci_device_id *ent;
    + void __iomem *mem;
    + unsigned long rng_base;
    +
    + for_each_pci_dev(pdev) {
    + ent = pci_match_id(pci_tbl, pdev);
    + if (ent)
    + goto found;
    + }
    + /* Device not found. */
    + goto out;
    +
    +found:
    + rng_base = pci_resource_start(pdev, 0);
    + if (rng_base == 0)
    + goto out;
    + err = -ENOMEM;
    + mem = ioremap(rng_base, 0x58);
    + if (!mem)
    + goto out;
    + geode_rng.priv = (unsigned long)mem;
    +
    + printk(KERN_INFO "AMD Geode RNG detected\n");
    + err = hwrng_register(&geode_rng);
    + if (err) {
    + printk(KERN_ERR PFX "RNG registering failed (%d)\n",
    + err);
    + goto out;
    + }
    +out:
    + return err;
    +}
    +
    +static void __exit mod_exit(void)
    +{
    + void __iomem *mem = (void __iomem *)geode_rng.priv;
    +
    + hwrng_unregister(&geode_rng);
    + iounmap(mem);
    +}
    +
    +subsys_initcall(mod_init);
    +module_exit(mod_exit);
    +
    +MODULE_AUTHOR("The Linux Kernel team");
    +MODULE_DESCRIPTION("H/W RNG driver for AMD Geode chipsets");
    +MODULE_LICENSE("GPL");
    --

    -
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