* derived from
*
* Hardware driver for the AMD 768 Random Number Generator (RNG)
- * (c) Copyright 2001 Red Hat Inc <alan@redhat.com>
+ * (c) Copyright 2001 Red Hat Inc
*
* derived from
*
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/hw_random.h>
+#include <linux/delay.h>
#include <asm/io.h>
return 4;
}
-static int geode_rng_data_present(struct hwrng *rng)
+static int geode_rng_data_present(struct hwrng *rng, int wait)
{
void __iomem *mem = (void __iomem *)rng->priv;
+ int data, i;
- return !!(readl(mem + GEODE_RNG_STATUS_REG));
+ for (i = 0; i < 20; i++) {
+ data = !!(readl(mem + GEODE_RNG_STATUS_REG));
+ if (data || !wait)
+ break;
+ udelay(10);
+ }
+ return data;
}
if (err) {
printk(KERN_ERR PFX "RNG registering failed (%d)\n",
err);
- goto out;
+ goto err_unmap;
}
out:
return err;
+
+err_unmap:
+ iounmap(mem);
+ goto out;
}
static void __exit mod_exit(void)
iounmap(mem);
}
-subsys_initcall(mod_init);
+module_init(mod_init);
module_exit(mod_exit);
MODULE_DESCRIPTION("H/W RNG driver for AMD Geode LX CPUs");