[PATCH] Geode LX HW RNG Support

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>

1 files changed, 69 insertions, 1 deletions

diff --git a/drivers/char/hw_random.c b/drivers/char/hw_random.c
index 6f673d2de0b1..49769f59ea1b 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) {