diff options
Diffstat (limited to 'drivers/char/hw_random.c')
| -rw-r--r-- | drivers/char/hw_random.c | 70 |
1 files changed, 69 insertions, 1 deletions
diff --git a/drivers/char/hw_random.c b/drivers/char/hw_random.c index 6f673d2de0b..49769f59ea1 100644 --- a/drivers/char/hw_random.c +++ b/drivers/char/hw_random.c @@ -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) { |