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Subject[PATCH 2/3] Geode LX HW RNG Support
Repost - no changes since last posting.

GEODE: Support for the Geodge LX HRNG

This patch adds support to hw_random for the Geode LX HRNG device.

Signed-off-by: Jordan Crouse <jordan.crouse@amd.com>
---
drivers/char/hw_random.c | 66 +++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 65 insertions(+), 1 deletions(-)
diff --git a/drivers/char/hw_random.c b/drivers/char/hw_random.c
index 6f673d2..4d69e05 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 (vo
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_
/* 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 +477,53 @@ 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 == NULL) 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 +638,7 @@ 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) {
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