/*
 * Radio tuning for GCT GRF5101 on RTL8180
 *
 * Copyright 2007 Andrea Merello <andreamrl@tiscali.it>
 *
 * Code from the BSD driver and the rtl8181 project have been
 * very useful to understand certain things
 *
 * I want to thanks the Authors of such projects and the Ndiswrapper
 * project Authors.
 *
 * A special Big Thanks also is for all people who donated me cards,
 * making possible the creation of the original rtl8180 driver
 * from which this code is derived!
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <net/mac80211.h>

#include "rtl8180.h"
#include "grf5101.h"

static const int grf5101_encode[] = {
        0x0, 0x8, 0x4, 0xC,
        0x2, 0xA, 0x6, 0xE,
        0x1, 0x9, 0x5, 0xD,
        0x3, 0xB, 0x7, 0xF
};

static void write_grf5101(struct ieee80211_hw *dev, u8 addr, u32 data)
{
        struct rtl8180_priv *priv = dev->priv;
        u32 phy_config;

        phy_config =  grf5101_encode[(data >> 8) & 0xF];
        phy_config |= grf5101_encode[(data >> 4) & 0xF] << 4;
        phy_config |= grf5101_encode[data & 0xF] << 8;
        phy_config |= grf5101_encode[(addr >> 1) & 0xF] << 12;
        phy_config |= (addr & 1) << 16;
        phy_config |= grf5101_encode[(data & 0xf000) >> 12] << 24;

        /* MAC will bang bits to the chip */
        phy_config |= 0x90000000;

        rtl818x_iowrite32(priv,
                (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);

        msleep(3);
}

static void grf5101_write_phy_antenna(struct ieee80211_hw *dev, short chan)
{
        struct rtl8180_priv *priv = dev->priv;
        u8 ant = GRF5101_ANTENNA;

        if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
                ant |= BB_ANTENNA_B;

        if (chan == 14)
                ant |= BB_ANTATTEN_CHAN14;

        rtl8180_write_phy(dev, 0x10, ant);
}

static u8 grf5101_rf_calc_rssi(u8 agc, u8 sq)
{
        if (agc > 60)
                return 65;

        /* TODO(?): just return agc (or agc + 5) to avoid mult / div */
        return 65 * agc / 60;
}

static void grf5101_rf_set_channel(struct ieee80211_hw *dev,
                                   struct ieee80211_conf *conf)
{
        struct rtl8180_priv *priv = dev->priv;
        int channel = ieee80211_frequency_to_channel(conf->channel->center_freq);
        u32 txpw = priv->channels[channel - 1].hw_value & 0xFF;
        u32 chan = channel - 1;

        /* set TX power */
        write_grf5101(dev, 0x15, 0x0);
        write_grf5101(dev, 0x06, txpw);
        write_grf5101(dev, 0x15, 0x10);
        write_grf5101(dev, 0x15, 0x0);

        /* set frequency */
        write_grf5101(dev, 0x07, 0x0);
        write_grf5101(dev, 0x0B, chan);
        write_grf5101(dev, 0x07, 0x1000);

        grf5101_write_phy_antenna(dev, channel);
}

static void grf5101_rf_stop(struct ieee80211_hw *dev)
{
        struct rtl8180_priv *priv = dev->priv;
        u32 anaparam;

        anaparam = priv->anaparam;
        anaparam &= 0x000fffff;
        anaparam |= 0x3f900000;
        rtl8180_set_anaparam(priv, anaparam);

        write_grf5101(dev, 0x07, 0x0);
        write_grf5101(dev, 0x1f, 0x45);
        write_grf5101(dev, 0x1f, 0x5);
        write_grf5101(dev, 0x00, 0x8e4);
}

static void grf5101_rf_init(struct ieee80211_hw *dev)
{
        struct rtl8180_priv *priv = dev->priv;

        rtl8180_set_anaparam(priv, priv->anaparam);

        write_grf5101(dev, 0x1f, 0x0);
        write_grf5101(dev, 0x1f, 0x0);
        write_grf5101(dev, 0x1f, 0x40);
        write_grf5101(dev, 0x1f, 0x60);
        write_grf5101(dev, 0x1f, 0x61);
        write_grf5101(dev, 0x1f, 0x61);
        write_grf5101(dev, 0x00, 0xae4);
        write_grf5101(dev, 0x1f, 0x1);
        write_grf5101(dev, 0x1f, 0x41);
        write_grf5101(dev, 0x1f, 0x61);

        write_grf5101(dev, 0x01, 0x1a23);
        write_grf5101(dev, 0x02, 0x4971);
        write_grf5101(dev, 0x03, 0x41de);
        write_grf5101(dev, 0x04, 0x2d80);
        write_grf5101(dev, 0x05, 0x68ff);       /* 0x61ff original value */
        write_grf5101(dev, 0x06, 0x0);
        write_grf5101(dev, 0x07, 0x0);
        write_grf5101(dev, 0x08, 0x7533);
        write_grf5101(dev, 0x09, 0xc401);
        write_grf5101(dev, 0x0a, 0x0);
        write_grf5101(dev, 0x0c, 0x1c7);
        write_grf5101(dev, 0x0d, 0x29d3);
        write_grf5101(dev, 0x0e, 0x2e8);
        write_grf5101(dev, 0x10, 0x192);
        write_grf5101(dev, 0x11, 0x248);
        write_grf5101(dev, 0x12, 0x0);
        write_grf5101(dev, 0x13, 0x20c4);
        write_grf5101(dev, 0x14, 0xf4fc);
        write_grf5101(dev, 0x15, 0x0);
        write_grf5101(dev, 0x16, 0x1500);

        write_grf5101(dev, 0x07, 0x1000);

        /* baseband configuration */
        rtl8180_write_phy(dev, 0, 0xa8);
        rtl8180_write_phy(dev, 3, 0x0);
        rtl8180_write_phy(dev, 4, 0xc0);
        rtl8180_write_phy(dev, 5, 0x90);
        rtl8180_write_phy(dev, 6, 0x1e);
        rtl8180_write_phy(dev, 7, 0x64);

        grf5101_write_phy_antenna(dev, 1);

        rtl8180_write_phy(dev, 0x11, 0x88);

        if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
            RTL818X_CONFIG2_ANTENNA_DIV)
                rtl8180_write_phy(dev, 0x12, 0xc0); /* enable ant diversity */
        else
                rtl8180_write_phy(dev, 0x12, 0x40); /* disable ant diversity */

        rtl8180_write_phy(dev, 0x13, 0x90 | priv->csthreshold);

        rtl8180_write_phy(dev, 0x19, 0x0);
        rtl8180_write_phy(dev, 0x1a, 0xa0);
        rtl8180_write_phy(dev, 0x1b, 0x44);
}

const struct rtl818x_rf_ops grf5101_rf_ops = {
        .name           = "GCT",
        .init           = grf5101_rf_init,
        .stop           = grf5101_rf_stop,
        .set_chan       = grf5101_rf_set_channel,
        .calc_rssi      = grf5101_rf_calc_rssi,
};