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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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42935ecaf4
The mac80211 workqueue exists to enable mac80211 and drivers to queue their own work on a single threaded workqueue. mac80211 takes care to flush the workqueue during suspend but we never really had requirements on drivers for how they should use the workqueue in consideration for suspend. We extend mac80211 to document how the mac80211 workqueue should be used, how it should not be used and finally move raw access to the workqueue to mac80211 only. Drivers and mac80211 use helpers to queue work onto the mac80211 workqueue: * ieee80211_queue_work() * ieee80211_queue_delayed_work() These helpers will now warn if mac80211 already completed its suspend cycle and someone is trying to queue work. mac80211 flushes the mac80211 workqueue prior to suspend a few times, but we haven't taken the care to ensure drivers won't add more work after suspend. To help with this we add a warning when someone tries to add work and mac80211 already completed the suspend cycle. Drivers should ensure they cancel any work or delayed work in the mac80211 stop() callback. Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
402 lines
9.7 KiB
C
402 lines
9.7 KiB
C
/*
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Broadcom B43 wireless driver
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Common PHY routines
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Copyright (c) 2005 Martin Langer <martin-langer@gmx.de>,
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Copyright (c) 2005-2007 Stefano Brivio <stefano.brivio@polimi.it>
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Copyright (c) 2005-2008 Michael Buesch <mb@bu3sch.de>
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Copyright (c) 2005, 2006 Danny van Dyk <kugelfang@gentoo.org>
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Copyright (c) 2005, 2006 Andreas Jaggi <andreas.jaggi@waterwave.ch>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
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Boston, MA 02110-1301, USA.
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*/
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#include "phy_common.h"
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#include "phy_g.h"
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#include "phy_a.h"
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#include "phy_n.h"
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#include "phy_lp.h"
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#include "b43.h"
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#include "main.h"
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int b43_phy_allocate(struct b43_wldev *dev)
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{
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struct b43_phy *phy = &(dev->phy);
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int err;
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phy->ops = NULL;
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switch (phy->type) {
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case B43_PHYTYPE_A:
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phy->ops = &b43_phyops_a;
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break;
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case B43_PHYTYPE_G:
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phy->ops = &b43_phyops_g;
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break;
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case B43_PHYTYPE_N:
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#ifdef CONFIG_B43_NPHY
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phy->ops = &b43_phyops_n;
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#endif
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break;
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case B43_PHYTYPE_LP:
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#ifdef CONFIG_B43_PHY_LP
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phy->ops = &b43_phyops_lp;
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#endif
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break;
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}
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if (B43_WARN_ON(!phy->ops))
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return -ENODEV;
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err = phy->ops->allocate(dev);
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if (err)
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phy->ops = NULL;
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return err;
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}
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void b43_phy_free(struct b43_wldev *dev)
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{
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dev->phy.ops->free(dev);
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dev->phy.ops = NULL;
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}
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int b43_phy_init(struct b43_wldev *dev)
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{
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struct b43_phy *phy = &dev->phy;
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const struct b43_phy_operations *ops = phy->ops;
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int err;
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phy->channel = ops->get_default_chan(dev);
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ops->software_rfkill(dev, false);
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err = ops->init(dev);
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if (err) {
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b43err(dev->wl, "PHY init failed\n");
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goto err_block_rf;
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}
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/* Make sure to switch hardware and firmware (SHM) to
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* the default channel. */
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err = b43_switch_channel(dev, ops->get_default_chan(dev));
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if (err) {
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b43err(dev->wl, "PHY init: Channel switch to default failed\n");
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goto err_phy_exit;
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}
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return 0;
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err_phy_exit:
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if (ops->exit)
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ops->exit(dev);
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err_block_rf:
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ops->software_rfkill(dev, true);
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return err;
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}
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void b43_phy_exit(struct b43_wldev *dev)
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{
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const struct b43_phy_operations *ops = dev->phy.ops;
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ops->software_rfkill(dev, true);
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if (ops->exit)
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ops->exit(dev);
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}
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bool b43_has_hardware_pctl(struct b43_wldev *dev)
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{
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if (!dev->phy.hardware_power_control)
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return 0;
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if (!dev->phy.ops->supports_hwpctl)
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return 0;
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return dev->phy.ops->supports_hwpctl(dev);
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}
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void b43_radio_lock(struct b43_wldev *dev)
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{
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u32 macctl;
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#if B43_DEBUG
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B43_WARN_ON(dev->phy.radio_locked);
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dev->phy.radio_locked = 1;
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#endif
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macctl = b43_read32(dev, B43_MMIO_MACCTL);
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macctl |= B43_MACCTL_RADIOLOCK;
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b43_write32(dev, B43_MMIO_MACCTL, macctl);
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/* Commit the write and wait for the firmware
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* to finish any radio register access. */
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b43_read32(dev, B43_MMIO_MACCTL);
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udelay(10);
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}
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void b43_radio_unlock(struct b43_wldev *dev)
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{
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u32 macctl;
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#if B43_DEBUG
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B43_WARN_ON(!dev->phy.radio_locked);
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dev->phy.radio_locked = 0;
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#endif
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/* Commit any write */
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b43_read16(dev, B43_MMIO_PHY_VER);
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/* unlock */
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macctl = b43_read32(dev, B43_MMIO_MACCTL);
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macctl &= ~B43_MACCTL_RADIOLOCK;
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b43_write32(dev, B43_MMIO_MACCTL, macctl);
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}
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void b43_phy_lock(struct b43_wldev *dev)
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{
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#if B43_DEBUG
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B43_WARN_ON(dev->phy.phy_locked);
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dev->phy.phy_locked = 1;
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#endif
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B43_WARN_ON(dev->dev->id.revision < 3);
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if (!b43_is_mode(dev->wl, NL80211_IFTYPE_AP))
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b43_power_saving_ctl_bits(dev, B43_PS_AWAKE);
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}
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void b43_phy_unlock(struct b43_wldev *dev)
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{
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#if B43_DEBUG
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B43_WARN_ON(!dev->phy.phy_locked);
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dev->phy.phy_locked = 0;
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#endif
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B43_WARN_ON(dev->dev->id.revision < 3);
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if (!b43_is_mode(dev->wl, NL80211_IFTYPE_AP))
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b43_power_saving_ctl_bits(dev, 0);
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}
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static inline void assert_mac_suspended(struct b43_wldev *dev)
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{
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if (!B43_DEBUG)
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return;
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if ((b43_status(dev) >= B43_STAT_INITIALIZED) &&
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(dev->mac_suspended <= 0)) {
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b43dbg(dev->wl, "PHY/RADIO register access with "
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"enabled MAC.\n");
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dump_stack();
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}
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}
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u16 b43_radio_read(struct b43_wldev *dev, u16 reg)
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{
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assert_mac_suspended(dev);
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return dev->phy.ops->radio_read(dev, reg);
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}
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void b43_radio_write(struct b43_wldev *dev, u16 reg, u16 value)
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{
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assert_mac_suspended(dev);
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dev->phy.ops->radio_write(dev, reg, value);
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}
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void b43_radio_mask(struct b43_wldev *dev, u16 offset, u16 mask)
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{
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b43_radio_write16(dev, offset,
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b43_radio_read16(dev, offset) & mask);
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}
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void b43_radio_set(struct b43_wldev *dev, u16 offset, u16 set)
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{
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b43_radio_write16(dev, offset,
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b43_radio_read16(dev, offset) | set);
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}
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void b43_radio_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set)
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{
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b43_radio_write16(dev, offset,
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(b43_radio_read16(dev, offset) & mask) | set);
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}
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u16 b43_phy_read(struct b43_wldev *dev, u16 reg)
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{
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assert_mac_suspended(dev);
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return dev->phy.ops->phy_read(dev, reg);
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}
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void b43_phy_write(struct b43_wldev *dev, u16 reg, u16 value)
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{
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assert_mac_suspended(dev);
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dev->phy.ops->phy_write(dev, reg, value);
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}
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void b43_phy_mask(struct b43_wldev *dev, u16 offset, u16 mask)
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{
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b43_phy_write(dev, offset,
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b43_phy_read(dev, offset) & mask);
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}
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void b43_phy_set(struct b43_wldev *dev, u16 offset, u16 set)
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{
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b43_phy_write(dev, offset,
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b43_phy_read(dev, offset) | set);
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}
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void b43_phy_maskset(struct b43_wldev *dev, u16 offset, u16 mask, u16 set)
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{
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b43_phy_write(dev, offset,
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(b43_phy_read(dev, offset) & mask) | set);
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}
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int b43_switch_channel(struct b43_wldev *dev, unsigned int new_channel)
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{
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struct b43_phy *phy = &(dev->phy);
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u16 channelcookie, savedcookie;
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int err;
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if (new_channel == B43_DEFAULT_CHANNEL)
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new_channel = phy->ops->get_default_chan(dev);
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/* First we set the channel radio code to prevent the
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* firmware from sending ghost packets.
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*/
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channelcookie = new_channel;
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if (b43_current_band(dev->wl) == IEEE80211_BAND_5GHZ)
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channelcookie |= 0x100;
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//FIXME set 40Mhz flag if required
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savedcookie = b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN);
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b43_shm_write16(dev, B43_SHM_SHARED, B43_SHM_SH_CHAN, channelcookie);
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/* Now try to switch the PHY hardware channel. */
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err = phy->ops->switch_channel(dev, new_channel);
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if (err)
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goto err_restore_cookie;
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dev->phy.channel = new_channel;
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/* Wait for the radio to tune to the channel and stabilize. */
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msleep(8);
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return 0;
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err_restore_cookie:
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b43_shm_write16(dev, B43_SHM_SHARED,
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B43_SHM_SH_CHAN, savedcookie);
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return err;
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}
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void b43_software_rfkill(struct b43_wldev *dev, bool blocked)
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{
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struct b43_phy *phy = &dev->phy;
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b43_mac_suspend(dev);
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phy->ops->software_rfkill(dev, blocked);
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phy->radio_on = !blocked;
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b43_mac_enable(dev);
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}
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/**
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* b43_phy_txpower_adjust_work - TX power workqueue.
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*
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* Workqueue for updating the TX power parameters in hardware.
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*/
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void b43_phy_txpower_adjust_work(struct work_struct *work)
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{
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struct b43_wl *wl = container_of(work, struct b43_wl,
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txpower_adjust_work);
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struct b43_wldev *dev;
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mutex_lock(&wl->mutex);
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dev = wl->current_dev;
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if (likely(dev && (b43_status(dev) >= B43_STAT_STARTED)))
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dev->phy.ops->adjust_txpower(dev);
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mutex_unlock(&wl->mutex);
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}
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/* Called with wl->irq_lock locked */
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void b43_phy_txpower_check(struct b43_wldev *dev, unsigned int flags)
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{
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struct b43_phy *phy = &dev->phy;
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unsigned long now = jiffies;
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enum b43_txpwr_result result;
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if (!(flags & B43_TXPWR_IGNORE_TIME)) {
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/* Check if it's time for a TXpower check. */
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if (time_before(now, phy->next_txpwr_check_time))
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return; /* Not yet */
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}
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/* The next check will be needed in two seconds, or later. */
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phy->next_txpwr_check_time = round_jiffies(now + (HZ * 2));
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if ((dev->dev->bus->boardinfo.vendor == SSB_BOARDVENDOR_BCM) &&
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(dev->dev->bus->boardinfo.type == SSB_BOARD_BU4306))
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return; /* No software txpower adjustment needed */
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result = phy->ops->recalc_txpower(dev, !!(flags & B43_TXPWR_IGNORE_TSSI));
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if (result == B43_TXPWR_RES_DONE)
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return; /* We are done. */
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B43_WARN_ON(result != B43_TXPWR_RES_NEED_ADJUST);
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B43_WARN_ON(phy->ops->adjust_txpower == NULL);
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/* We must adjust the transmission power in hardware.
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* Schedule b43_phy_txpower_adjust_work(). */
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ieee80211_queue_work(dev->wl->hw, &dev->wl->txpower_adjust_work);
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}
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int b43_phy_shm_tssi_read(struct b43_wldev *dev, u16 shm_offset)
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{
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const bool is_ofdm = (shm_offset != B43_SHM_SH_TSSI_CCK);
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unsigned int a, b, c, d;
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unsigned int average;
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u32 tmp;
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tmp = b43_shm_read32(dev, B43_SHM_SHARED, shm_offset);
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a = tmp & 0xFF;
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b = (tmp >> 8) & 0xFF;
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c = (tmp >> 16) & 0xFF;
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d = (tmp >> 24) & 0xFF;
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if (a == 0 || a == B43_TSSI_MAX ||
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b == 0 || b == B43_TSSI_MAX ||
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c == 0 || c == B43_TSSI_MAX ||
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d == 0 || d == B43_TSSI_MAX)
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return -ENOENT;
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/* The values are OK. Clear them. */
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tmp = B43_TSSI_MAX | (B43_TSSI_MAX << 8) |
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(B43_TSSI_MAX << 16) | (B43_TSSI_MAX << 24);
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b43_shm_write32(dev, B43_SHM_SHARED, shm_offset, tmp);
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if (is_ofdm) {
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a = (a + 32) & 0x3F;
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b = (b + 32) & 0x3F;
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c = (c + 32) & 0x3F;
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d = (d + 32) & 0x3F;
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}
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/* Get the average of the values with 0.5 added to each value. */
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average = (a + b + c + d + 2) / 4;
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if (is_ofdm) {
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/* Adjust for CCK-boost */
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if (b43_shm_read16(dev, B43_SHM_SHARED, B43_SHM_SH_HOSTFLO)
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& B43_HF_CCKBOOST)
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average = (average >= 13) ? (average - 13) : 0;
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}
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return average;
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}
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void b43_phyop_switch_analog_generic(struct b43_wldev *dev, bool on)
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{
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b43_write16(dev, B43_MMIO_PHY0, on ? 0 : 0xF4);
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}
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