/*
Broadcom B43 wireless driver
Common PHY routines
Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
Copyright (c) 2005-2007 Stefano Brivio <stefano.brivio@polimi.it>
Copyright (c) 2005-2008 Michael Buesch <m@bues.ch>
Copyright (c) 2005, 2006 Danny van Dyk <kugelfang@gentoo.org>
Copyright (c) 2005, 2006 Andreas Jaggi <andreas.jaggi@waterwave.ch>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include "phy_common.h"
#include "phy_g.h"
#include "phy_a.h"
#include "phy_n.h"
#include "phy_lp.h"
#include "phy_ht.h"
#include "phy_lcn.h"
#include "b43.h"
#include "main.h"
int b43_phy_allocate(struct b43_wldev *dev)
{
struct b43_phy *phy = &(dev->phy);
int err;
phy->ops = NULL;
switch (phy->type) {
case B43_PHYTYPE_A:
phy->ops = &b43_phyops_a;
break;
case B43_PHYTYPE_G:
phy->ops = &b43_phyops_g;
break;
case B43_PHYTYPE_N:
#ifdef CONFIG_B43_PHY_N
phy->ops = &b43_phyops_n;
#endif
break;
case B43_PHYTYPE_LP:
#ifdef CONFIG_B43_PHY_LP
phy->ops = &b43_phyops_lp;
#endif
break;
case B43_PHYTYPE_HT:
#ifdef CONFIG_B43_PHY_HT
phy->ops = &b43_phyops_ht;
#endif
break;
case B43_PHYTYPE_LCN:
#ifdef CONFIG_B43_PHY_LCN
phy->ops = &b43_phyops_lcn;
#endif
break;
}
if (B43_WARN_ON(!phy->ops))
return -ENODEV;
err = phy->ops->allocate(dev);
if (err)
phy->ops = NULL;
return err;
}
void b43_phy_free(struct b43_wldev *dev)
{
dev->phy.ops->free(dev);
dev->phy.ops = NULL;
}
int b43_phy_init(struct b43_wldev *dev)
{
struct b43_phy *phy = &dev->phy;
const struct b43_phy_operations *ops = phy->ops;
int err;
phy->channel = ops->get_default_chan(dev);
ops->software_rfkill(dev, false);
err = ops->init(dev);
if (err) {
b43err(dev->wl, "PHY init failed\n");
goto err_block_rf;
}
/* Make sure to switch hardware and firmware (SHM) to
* the default channel. */
err = b43_switch_channel(dev, ops->get_default_chan(dev));
if (err) {
b43err(dev->wl, "PHY init: Channel switch to default failed\n");
goto err_phy_exit;
}
return 0;
err_phy_exit:
if (ops->exit)
ops->exit(dev);
err_block_rf:
ops->software_rfkill(dev, true);
return err;
}
void b43_phy_exit(struct b43_wldev *dev)
{
const struct b43_phy_operations *ops = dev->phy.ops;
ops->software_rfkill(dev, true);
if (ops->exit)
ops->exit(dev);
}
bool b43_has_hardware_pctl(struct b43_wldev *dev)
{
if (!dev->phy.hardware_power_control)
return 0;
if (!dev->phy.ops->supports_hwpctl)
return 0;
return dev->phy.ops->supports_hwpctl(dev);
}
void b43_radio_lock(struct b43_wldev *dev)
{
u32 macctl;
#if B43_DEBUG
B43_WARN_ON(dev->phy.radio_locked);
dev->phy.radio_locked = 1;
#endif
macctl = b43_read32(dev, B43_MMIO_MACCTL);
macctl |= B43_MACCTL_RADIOLOCK;
b43_write32(dev, B43_MMIO_MACCTL, macctl);
/* Commit the write and wait for the firmware
* to finish any radio register access. */
b43_read32(dev, B43_MMIO_MACCTL);
udelay(10);
}
void b43_radio_unlock(struct b43_wldev *dev)
{
u32 macctl;
#if B43_DEBUG
B43_WARN_ON(!dev->phy.radio_locked);
dev->phy.radio_locked = 0;
#endif
/* Commit any write */
b43_read16(dev, B43_MMIO_PHY_VER);
/* unlock */
macctl = b43_read32(dev, B43_MMIO_MACCTL);
macctl &= ~B43_MACCTL_RADIOLOCK;
b43_write32(dev, B43_MMIO_MACCTL, macctl);
}
void b43_phy_lock(struct b43_wldev *dev)
{
#if B43_DEBUG
B43_WARN_ON(dev->phy.phy_locked);
dev->phy.phy_locked = 1;
#endif
B43_WARN_ON(dev->dev->core_rev < 3);
if (!b43_is_mode(dev->wl, NL80211_IFTYPE_AP))
b43_power_saving_ctl_bits(dev, B43_PS_AWAKE);
}
void b43_phy_unlock(struct b43_wldev *dev)
{
#if B43_DEBUG
B43_WARN_ON(!dev->phy.phy_locked);
dev->phy.phy_locked = 0;
#endif
B43_WARN_ON(dev->dev->core_rev < 3);
if (!b43_is_mode(dev->wl, NL80211_IFTYPE_AP))
b43_power_saving_ctl_bits(dev, 0);
}
static inline void assert_mac_suspended(struct b43_wldev *dev)
{
if (!B43_DEBUG)
return;
if ((b43_status(dev) >= B43_STAT_INITIALIZED) &&
(dev->mac_suspended <= 0)) {
b43dbg(dev->wl, "PHY/RADIO register access with "
"enabled MAC.\n");
dump_stack();
}
}
u16 b43_radio_read(struct b43_wldev *dev, u16 reg)
{
assert_mac_suspended(dev);
return dev->phy.ops->radio_read(dev, reg);
}
void b43_radio_write(struct b43_wldev *dev, u16 reg, u16 value)
{
assert_mac_suspended(dev);
dev->phy.ops->radio_write(dev, reg, value);
}
void b43_radio_mask(struct b43_wldev *dev, u16 offset, u16 mask)
{
b43_radio_write16(dev, offset,
b43_radio_read16(dev, offset) & mask);
}
void b43_radio_set(struct b43_wldev *dev, u16 offset, u16 set)
{
b43_radio_write16(dev, offset,
b43_radio_read16(dev, offset) | set);
}
void b43_radio_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set)
{
b43_radio_write16(dev, offset,
(b43_radio_read16(dev, offset) & mask) | set);
}
u16 b43_phy_read(struct b43_wldev *dev, u16 reg)
{
assert_mac_suspended(dev);
dev->phy.writes_counter = 0;
return dev->phy.ops->phy_read(dev, reg);
}
void b43_phy_write(struct b43_wldev *dev, u16 reg, u16 value)
{
assert_mac_suspended(dev);
dev->phy.ops->phy_write(dev, reg, value);
if (++dev->phy.writes_counter == B43_MAX_WRITES_IN_ROW) {
b43_read16(dev, B43_MMIO_PHY_VER);
dev->phy.writes_counter = 0;
}
}
void b43_phy_copy(struct b43_wldev *dev, u16 destreg, u16 srcreg)
{
assert_mac_suspended(dev);
dev->phy.ops->phy_write(dev, destreg,
dev->phy.ops->phy_read(dev, srcreg));
}
void b43_phy_mask(struct b43_wldev *dev, u16 offset, u16 mask)
{
if (dev->phy.ops->phy_maskset) {
assert_mac_suspended(dev);
dev->phy.ops->phy_maskset(dev, offset, mask, 0);
} else {
b43_phy_write(dev, offset,
b43_phy_read(dev, offset) & mask);
}
}
void b43_phy_set(struct b43_wldev *dev, u16 offset, u16 set)
{
if (dev->phy.ops->phy_maskset) {
assert_mac_suspended(dev);
dev->phy.ops->phy_maskset(dev, offset, 0xFFFF, set);
} else {
b43_phy_write(dev, offset,
b43_phy_read(dev, offset) | set);
}
}
void b43_phy_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set)
{
if (dev->phy.ops->phy_maskset) {
assert_mac_suspended(dev);
dev->phy.ops->phy_maskset(dev, offset, mask, set);
} else {
b43_phy_write(dev, offset,
(b43_phy_read(dev, offset) & mask) | set);
}
}
int b43_switch_channel(struct b43_wldev *dev, unsigned int new_channel)
{
struct b43_phy *phy = &(dev->phy);
u16 channelcookie, savedcookie;
int err;
if (new_channel == B43_DEFAULT_CHANNEL)
new_channel = phy->ops->get_default_chan(dev);
/* First we set the channel radio code to prevent the
* firmware from sending ghost packets.
*/
channelcookie = new_channel;
if (b43_current_band(dev->wl) == IEEE80211_BAND_5GHZ)
channelcookie |= B43_SHM_SH_CHAN_5GHZ;
/* FIXME: set 40Mhz flag if required */
if (0)
channelcookie |= B43_SHM_SH_CHAN_40MHZ;
savedcookie = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN);
b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN, channelcookie);
/* Now try to switch the PHY hardware channel. */
err = phy->ops->switch_channel(dev, new_channel);
if (err)
goto err_restore_cookie;
dev->phy.channel = new_channel;
/* Wait for the radio to tune to the channel and stabilize. */
msleep(8);
return 0;
err_restore_cookie:
b43_shm_write16(dev, B43_SHM_SHARED,
B43_SHM_SH_CHAN, savedcookie);
return err;
}
void b43_software_rfkill(struct b43_wldev *dev, bool blocked)
{
struct b43_phy *phy = &dev->phy;
b43_mac_suspend(dev);
phy->ops->software_rfkill(dev, blocked);
phy->radio_on = !blocked;
b43_mac_enable(dev);
}
/**
* b43_phy_txpower_adjust_work - TX power workqueue.
*
* Workqueue for updating the TX power parameters in hardware.
*/
void b43_phy_txpower_adjust_work(struct work_struct *work)
{
struct b43_wl *wl = container_of(work, struct b43_wl,
txpower_adjust_work);
struct b43_wldev *dev;
mutex_lock(&wl->mutex);
dev = wl->current_dev;
if (likely(dev && (b43_status(dev) >= B43_STAT_STARTED)))
dev->phy.ops->adjust_txpower(dev);
mutex_unlock(&wl->mutex);
}
void b43_phy_txpower_check(struct b43_wldev *dev, unsigned int flags)
{
struct b43_phy *phy = &dev->phy;
unsigned long now = jiffies;
enum b43_txpwr_result result;
if (!(flags & B43_TXPWR_IGNORE_TIME)) {
/* Check if it's time for a TXpower check. */
if (time_before(now, phy->next_txpwr_check_time))
return; /* Not yet */
}
/* The next check will be needed in two seconds, or later. */
phy->next_txpwr_check_time = round_jiffies(now + (HZ * 2));
if ((dev->dev->board_vendor == SSB_BOARDVENDOR_BCM) &&
(dev->dev->board_type == SSB_BOARD_BU4306))
return; /* No software txpower adjustment needed */
result = phy->ops->recalc_txpower(dev, !!(flags & B43_TXPWR_IGNORE_TSSI));
if (result == B43_TXPWR_RES_DONE)
return; /* We are done. */
B43_WARN_ON(result != B43_TXPWR_RES_NEED_ADJUST);
B43_WARN_ON(phy->ops->adjust_txpower == NULL);
/* We must adjust the transmission power in hardware.
* Schedule b43_phy_txpower_adjust_work(). */
ieee80211_queue_work(dev->wl->hw, &dev->wl->txpower_adjust_work);
}
int b43_phy_shm_tssi_read(struct b43_wldev *dev, u16 shm_offset)
{
const bool is_ofdm = (shm_offset != B43_SHM_SH_TSSI_CCK);
unsigned int a, b, c, d;
unsigned int average;
u32 tmp;
tmp = b43_shm_read32(dev, B43_SHM_SHARED, shm_offset);
a = tmp & 0xFF;
b = (tmp >> 8) & 0xFF;
c = (tmp >> 16) & 0xFF;
d = (tmp >> 24) & 0xFF;
if (a == 0 || a == B43_TSSI_MAX ||
b == 0 || b == B43_TSSI_MAX ||
c == 0 || c == B43_TSSI_MAX ||
d == 0 || d == B43_TSSI_MAX)
return -ENOENT;
/* The values are OK. Clear them. */
tmp = B43_TSSI_MAX | (B43_TSSI_MAX << 8) |
(B43_TSSI_MAX << 16) | (B43_TSSI_MAX << 24);
b43_shm_write32(dev, B43_SHM_SHARED, shm_offset, tmp);
if (is_ofdm) {
a = (a + 32) & 0x3F;
b = (b + 32) & 0x3F;
c = (c + 32) & 0x3F;
d = (d + 32) & 0x3F;
}
/* Get the average of the values with 0.5 added to each value. */
average = (a + b + c + d + 2) / 4;
if (is_ofdm) {
/* Adjust for CCK-boost */
if (b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_HOSTFLO)
& B43_HF_CCKBOOST)
average = (average >= 13) ? (average - 13) : 0;
}
return average;
}
void b43_phyop_switch_analog_generic(struct b43_wldev *dev, bool on)
{
b43_write16(dev, B43_MMIO_PHY0, on ? 0 : 0xF4);
}
bool b43_channel_type_is_40mhz(enum nl80211_channel_type channel_type)
{
return (channel_type == NL80211_CHAN_HT40MINUS ||
channel_type == NL80211_CHAN_HT40PLUS);
}
/* http://bcm-v4.sipsolutions.net/802.11/PHY/N/BmacPhyClkFgc */
void b43_phy_force_clock(struct b43_wldev *dev, bool force)
{
u32 tmp;
WARN_ON(dev->phy.type != B43_PHYTYPE_N &&
dev->phy.type != B43_PHYTYPE_HT);
switch (dev->dev->bus_type) {
#ifdef CONFIG_B43_BCMA
case B43_BUS_BCMA:
tmp = bcma_aread32(dev->dev->bdev, BCMA_IOCTL);
if (force)
tmp |= BCMA_IOCTL_FGC;
else
tmp &= ~BCMA_IOCTL_FGC;
bcma_awrite32(dev->dev->bdev, BCMA_IOCTL, tmp);
break;
#endif
#ifdef CONFIG_B43_SSB
case B43_BUS_SSB:
tmp = ssb_read32(dev->dev->sdev, SSB_TMSLOW);
if (force)
tmp |= SSB_TMSLOW_FGC;
else
tmp &= ~SSB_TMSLOW_FGC;
ssb_write32(dev->dev->sdev, SSB_TMSLOW, tmp);
break;
#endif
}
}
/* http://bcm-v4.sipsolutions.net/802.11/PHY/Cordic */
struct b43_c32 b43_cordic(int theta)
{
static const u32 arctg[] = {
2949120, 1740967, 919879, 466945, 234379, 117304,
58666, 29335, 14668, 7334, 3667, 1833,
917, 458, 229, 115, 57, 29,
};
u8 i;
s32 tmp;
s8 signx = 1;
u32 angle = 0;
struct b43_c32 ret = { .i = 39797, .q = 0, };
while (theta > (180 << 16))
theta -= (360 << 16);
while (theta < -(180 << 16))
theta += (360 << 16);
if (theta > (90 << 16)) {
theta -= (180 << 16);
signx = -1;
} else if (theta < -(90 << 16)) {
theta += (180 << 16);
signx = -1;
}
for (i = 0; i <= 17; i++) {
if (theta > angle) {
tmp = ret.i - (ret.q >> i);
ret.q += ret.i >> i;
ret.i = tmp;
angle += arctg[i];
} else {
tmp = ret.i + (ret.q >> i);
ret.q -= ret.i >> i;
ret.i = tmp;
angle -= arctg[i];
}
}
ret.i *= signx;
ret.q *= signx;
return ret;
}
