[patch 6/6] New Generic HW RNG (#2)

Michael Buesch
2006-05-07T14:40:04Z

[-- Attachment #1: bcm43xx-hw-random.patch --]
[-- Type: text/plain, Size: 3596 bytes --]

Add bcm43xx H/W RNG support.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Index: hwrng/drivers/net/wireless/bcm43xx/Kconfig
===================================================================
--- hwrng.orig/drivers/net/wireless/bcm43xx/Kconfig 2006-05-07 15:47:21.000000000 +0200
+++ hwrng/drivers/net/wireless/bcm43xx/Kconfig 2006-05-07 15:50:32.000000000 +0200
@@ -2,6 +2,7 @@
tristate "Broadcom BCM43xx wireless support"
depends on PCI && IEEE80211 && IEEE80211_SOFTMAC && NET_RADIO && EXPERIMENTAL
select FW_LOADER
+ select HW_RANDOM
---help---
This is an experimental driver for the Broadcom 43xx wireless chip,
found in the Apple Airport Extreme and various other devices.
Index: hwrng/drivers/net/wireless/bcm43xx/bcm43xx.h
===================================================================
--- hwrng.orig/drivers/net/wireless/bcm43xx/bcm43xx.h 2006-05-07 15:47:21.000000000 +0200
+++ hwrng/drivers/net/wireless/bcm43xx/bcm43xx.h 2006-05-07 15:50:32.000000000 +0200
@@ -1,6 +1,7 @@
#ifndef BCM43xx_H_
#define BCM43xx_H_

+#include <linux/hw_random.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
@@ -82,6 +83,7 @@
#define BCM43xx_MMIO_TSF_1 0x634 /* core rev < 3 only */
#define BCM43xx_MMIO_TSF_2 0x636 /* core rev < 3 only */
#define BCM43xx_MMIO_TSF_3 0x638 /* core rev < 3 only */
+#define BCM43xx_MMIO_RNG 0x65A
#define BCM43xx_MMIO_POWERUP_DELAY 0x6A8

/* SPROM offsets. */
@@ -741,6 +743,10 @@
const struct firmware *initvals0;
const struct firmware *initvals1;

+ /* Random Number Generator. */
+ struct hwrng rng;
+ char rng_name[20 + 1];
+
/* Debugging stuff follows. */
#ifdef CONFIG_BCM43XX_DEBUG
struct bcm43xx_dfsentry *dfsentry;
Index: hwrng/drivers/net/wireless/bcm43xx/bcm43xx_main.c
===================================================================
--- hwrng.orig/drivers/net/wireless/bcm43xx/bcm43xx_main.c 2006-05-07 15:47:21.000000000 +0200
+++ hwrng/drivers/net/wireless/bcm43xx/bcm43xx_main.c 2006-05-07 15:50:32.000000000 +0200
@@ -3144,6 +3144,39 @@
bcm43xx_clear_keys(bcm);
}

+static int bcm43xx_rng_read(struct hwrng *rng, u32 *data)
+{
+ struct bcm43xx_private *bcm = (struct bcm43xx_private *)rng->priv;
+ unsigned long flags;
+
+ bcm43xx_lock(bcm, flags);
+ *data = bcm43xx_read16(bcm, BCM43xx_MMIO_RNG);
+ bcm43xx_unlock(bcm, flags);
+
+ return (sizeof(u16));
+}
+
+static void bcm43xx_rng_exit(struct bcm43xx_private *bcm)
+{
+ hwrng_unregister(&bcm->rng);
+}
+
+static int bcm43xx_rng_init(struct bcm43xx_private *bcm)
+{
+ int err;
+
+ snprintf(bcm->rng_name, ARRAY_SIZE(bcm->rng_name),
+ "%s_%s", KBUILD_MODNAME, bcm->net_dev->name);
+ bcm->rng.name = bcm->rng_name;
+ bcm->rng.data_read = bcm43xx_rng_read;
+ bcm->rng.priv = (unsigned long)bcm;
+ err = hwrng_register(&bcm->rng);
+ if (err)
+ printk(KERN_ERR PFX "RNG init failed (%d)\n", err);
+
+ return err;
+}
+
/* This is the opposite of bcm43xx_init_board() */
static void bcm43xx_free_board(struct bcm43xx_private *bcm)
{
@@ -3159,6 +3192,7 @@
bcm->shutting_down = 1;
bcm43xx_unlock(bcm, flags);

+ bcm43xx_rng_exit(bcm);
for (i = 0; i < BCM43xx_MAX_80211_CORES; i++) {
if (!bcm->core_80211[i].available)
continue;
@@ -3240,6 +3274,9 @@
bcm43xx_switch_core(bcm, &bcm->core_80211[0]);
bcm43xx_mac_enable(bcm);
}
+ err = bcm43xx_rng_init(bcm);
+ if (err)
+ goto err_80211_unwind;
bcm43xx_macfilter_clear(bcm, BCM43xx_MACFILTER_ASSOC);
bcm43xx_macfilter_set(bcm, BCM43xx_MACFILTER_SELF, (u8 *)(bcm->net_dev->dev_addr));
dprintk(KERN_INFO PFX "80211 cores initialized\n");

--