Commit 71c0cd70 authored by Michael Buesch's avatar Michael Buesch Committed by Linus Torvalds
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[PATCH] Add bcm43xx HW RNG support


Signed-off-by: default avatarMichael Buesch <mb@bu3sch.de>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ebc915ad
......@@ -2,6 +2,7 @@ config BCM43XX
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.
......
#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. */
......@@ -750,6 +752,10 @@ struct bcm43xx_private {
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;
......
......@@ -3237,6 +3237,39 @@ static void bcm43xx_security_init(struct bcm43xx_private *bcm)
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_irqonly(bcm, flags);
*data = bcm43xx_read16(bcm, BCM43xx_MMIO_RNG);
bcm43xx_unlock_irqonly(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)
{
......@@ -3248,6 +3281,7 @@ static void bcm43xx_free_board(struct bcm43xx_private *bcm)
bcm43xx_set_status(bcm, BCM43xx_STAT_SHUTTINGDOWN);
bcm43xx_rng_exit(bcm);
for (i = 0; i < BCM43xx_MAX_80211_CORES; i++) {
if (!bcm->core_80211[i].available)
continue;
......@@ -3325,6 +3359,9 @@ static int bcm43xx_init_board(struct bcm43xx_private *bcm)
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");
......
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