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authorMichael Buesch <mb@bu3sch.de>2006-06-26 00:25:00 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:19 -0700
commit96d63c0297ccfd6d9059c614b3f5555d9441a2b3 (patch)
treec4d3abbb9b03456b8c258d75e2c3b260d8f9ccf5 /drivers
parentca644bd5039566725b7c71a559e65ea91b7abfb5 (diff)
[PATCH] Add AMD HW RNG driver
Signed-off-by: Michael Buesch <mb@bu3sch.de> Cc: Jeff Garzik <jeff@garzik.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/hw_random/Kconfig13
-rw-r--r--drivers/char/hw_random/Makefile1
-rw-r--r--drivers/char/hw_random/amd-rng.c152
3 files changed, 166 insertions, 0 deletions
diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index e9ae4b1313a..950247313ca 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -22,3 +22,16 @@ config HW_RANDOM_INTEL
module will be called intel-rng.
If unsure, say Y.
+
+config HW_RANDOM_AMD
+ tristate "AMD HW Random Number Generator support"
+ depends on HW_RANDOM && X86 && PCI
+ default y
+ ---help---
+ This driver provides kernel-side support for the Random Number
+ Generator hardware found on AMD 76x-based motherboards.
+
+ To compile this driver as a module, choose M here: the
+ module will be called amd-rng.
+
+ If unsure, say Y.
diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile
index d3118e3750a..40dbc097a5d 100644
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -4,3 +4,4 @@
obj-$(CONFIG_HW_RANDOM) += core.o
obj-$(CONFIG_HW_RANDOM_INTEL) += intel-rng.o
+obj-$(CONFIG_HW_RANDOM_AMD) += amd-rng.o
diff --git a/drivers/char/hw_random/amd-rng.c b/drivers/char/hw_random/amd-rng.c
new file mode 100644
index 00000000000..71e4e0f3fd5
--- /dev/null
+++ b/drivers/char/hw_random/amd-rng.c
@@ -0,0 +1,152 @@
+/*
+ * RNG driver for AMD 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 ": "
+
+
+/*
+ * 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[] = {
+ { 0x1022, 0x7443, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },
+ { 0x1022, 0x746b, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0, },
+ { 0, }, /* terminate list */
+};
+MODULE_DEVICE_TABLE(pci, pci_tbl);
+
+static struct pci_dev *amd_pdev;
+
+
+static int amd_rng_data_present(struct hwrng *rng)
+{
+ u32 pmbase = (u32)rng->priv;
+
+ return !!(inl(pmbase + 0xF4) & 1);
+}
+
+static int amd_rng_data_read(struct hwrng *rng, u32 *data)
+{
+ u32 pmbase = (u32)rng->priv;
+
+ *data = inl(pmbase + 0xF0);
+
+ return 4;
+}
+
+static int amd_rng_init(struct hwrng *rng)
+{
+ u8 rnen;
+
+ pci_read_config_byte(amd_pdev, 0x40, &rnen);
+ rnen |= (1 << 7); /* RNG on */
+ pci_write_config_byte(amd_pdev, 0x40, rnen);
+
+ pci_read_config_byte(amd_pdev, 0x41, &rnen);
+ rnen |= (1 << 7); /* PMIO enable */
+ pci_write_config_byte(amd_pdev, 0x41, rnen);
+
+ return 0;
+}
+
+static void amd_rng_cleanup(struct hwrng *rng)
+{
+ u8 rnen;
+
+ pci_read_config_byte(amd_pdev, 0x40, &rnen);
+ rnen &= ~(1 << 7); /* RNG off */
+ pci_write_config_byte(amd_pdev, 0x40, rnen);
+}
+
+
+static struct hwrng amd_rng = {
+ .name = "amd",
+ .init = amd_rng_init,
+ .cleanup = amd_rng_cleanup,
+ .data_present = amd_rng_data_present,
+ .data_read = amd_rng_data_read,
+};
+
+
+static int __init mod_init(void)
+{
+ int err = -ENODEV;
+ struct pci_dev *pdev = NULL;
+ const struct pci_device_id *ent;
+ u32 pmbase;
+
+ for_each_pci_dev(pdev) {
+ ent = pci_match_id(pci_tbl, pdev);
+ if (ent)
+ goto found;
+ }
+ /* Device not found. */
+ goto out;
+
+found:
+ err = pci_read_config_dword(pdev, 0x58, &pmbase);
+ if (err)
+ goto out;
+ err = -EIO;
+ pmbase &= 0x0000FF00;
+ if (pmbase == 0)
+ goto out;
+ amd_rng.priv = (unsigned long)pmbase;
+ amd_pdev = pdev;
+
+ printk(KERN_INFO "AMD768 RNG detected\n");
+ err = hwrng_register(&amd_rng);
+ if (err) {
+ printk(KERN_ERR PFX "RNG registering failed (%d)\n",
+ err);
+ goto out;
+ }
+out:
+ return err;
+}
+
+static void __exit mod_exit(void)
+{
+ hwrng_unregister(&amd_rng);
+}
+
+subsys_initcall(mod_init);
+module_exit(mod_exit);
+
+MODULE_AUTHOR("The Linux Kernel team");
+MODULE_DESCRIPTION("H/W RNG driver for AMD chipsets");
+MODULE_LICENSE("GPL");