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[PATCH] Geode LX HW RNG Support

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Add support to hw_random for the Geode LX HRNG device.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jordan Crouse 2006-01-06 00:12:15 -08:00 committed by Linus Torvalds
parent f90b811603
commit a7a4ad0998
1 changed files with 69 additions and 1 deletions
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70
drivers/char/hw_random.c
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@ -1,4 +1,9 @@
/*
Added support for the AMD Geode LX RNG
(c) Copyright 2004-2005 Advanced Micro Devices, Inc.
derived from
Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG)
(c) Copyright 2003 Red Hat Inc <jgarzik@redhat.com>
@ -95,6 +100,11 @@ static unsigned int via_data_present (void);
static u32 via_data_read (void);
#endif
static int __init geode_init(struct pci_dev *dev);
static void geode_cleanup(void);
static unsigned int geode_data_present (void);
static u32 geode_data_read (void);
struct rng_operations {
int (*init) (struct pci_dev *dev);
void (*cleanup) (void);
@ -122,6 +132,7 @@ enum {
rng_hw_intel,
rng_hw_amd,
rng_hw_via,
rng_hw_geode,
};
static struct rng_operations rng_vendor_ops[] = {
@ -139,6 +150,9 @@ static struct rng_operations rng_vendor_ops[] = {
/* rng_hw_via */
{ via_init, via_cleanup, via_data_present, via_data_read, 1 },
#endif
/* rng_hw_geode */
{ geode_init, geode_cleanup, geode_data_present, geode_data_read, 4 }
};
/*
@ -159,6 +173,9 @@ static struct pci_device_id rng_pci_tbl[] = {
{ 0x8086, 0x244e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, rng_hw_intel },
{ 0x8086, 0x245e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, rng_hw_intel },
{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LX_AES,
PCI_ANY_ID, PCI_ANY_ID, 0, 0, rng_hw_geode },
{ 0, }, /* terminate list */
};
MODULE_DEVICE_TABLE (pci, rng_pci_tbl);
@ -460,6 +477,57 @@ static void via_cleanup(void)
}
#endif
/***********************************************************************
*
* AMD Geode RNG operations
*
*/
static void __iomem *geode_rng_base = NULL;
#define GEODE_RNG_DATA_REG 0x50
#define GEODE_RNG_STATUS_REG 0x54
static u32 geode_data_read(void)
{
u32 val;
assert(geode_rng_base != NULL);
val = readl(geode_rng_base + GEODE_RNG_DATA_REG);
return val;
}
static unsigned int geode_data_present(void)
{
u32 val;
assert(geode_rng_base != NULL);
val = readl(geode_rng_base + GEODE_RNG_STATUS_REG);
return val;
}
static void geode_cleanup(void)
{
iounmap(geode_rng_base);
geode_rng_base = NULL;
}
static int geode_init(struct pci_dev *dev)
{
unsigned long rng_base = pci_resource_start(dev, 0);
if (rng_base == 0)
return 1;
geode_rng_base = ioremap(rng_base, 0x58);
if (geode_rng_base == NULL) {
printk(KERN_ERR PFX "Cannot ioremap RNG memory\n");
return -EBUSY;
}
return 0;
}
/***********************************************************************
*
@ -574,7 +642,7 @@ static int __init rng_init (void)
DPRINTK ("ENTER\n");
/* Probe for Intel, AMD RNGs */
/* Probe for Intel, AMD, Geode RNGs */
for_each_pci_dev(pdev) {
ent = pci_match_id(rng_pci_tbl, pdev);
if (ent) {