/*

  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 false;
        if (!dev->phy.ops->supports_hwpctl)
                return false;
        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 = true;
#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 = false;
#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 = true;
#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 = false;
#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);
}

bool b43_radio_wait_value(struct b43_wldev *dev, u16 offset, u16 mask,
                          u16 value, int delay, int timeout)
{
        u16 val;
        int i;

        for (i = 0; i < timeout; i += delay) {
                val = b43_radio_read(dev, offset);
                if ((val & mask) == value)
                        return true;
                udelay(delay);
        }
        return false;
}

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_HOSTF1)
                    & 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;
}