linux/drivers/net/wireless/realtek/rtl818x/rtl8180/grf5101.c
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   1
   2/*
   3 * Radio tuning for GCT GRF5101 on RTL8180
   4 *
   5 * Copyright 2007 Andrea Merello <andrea.merello@gmail.com>
   6 *
   7 * Code from the BSD driver and the rtl8181 project have been
   8 * very useful to understand certain things
   9 *
  10 * I want to thanks the Authors of such projects and the Ndiswrapper
  11 * project Authors.
  12 *
  13 * A special Big Thanks also is for all people who donated me cards,
  14 * making possible the creation of the original rtl8180 driver
  15 * from which this code is derived!
  16 *
  17 * This program is free software; you can redistribute it and/or modify
  18 * it under the terms of the GNU General Public License version 2 as
  19 * published by the Free Software Foundation.
  20 */
  21
  22#include <linux/pci.h>
  23#include <linux/delay.h>
  24#include <net/mac80211.h>
  25
  26#include "rtl8180.h"
  27#include "grf5101.h"
  28
  29static const int grf5101_encode[] = {
  30        0x0, 0x8, 0x4, 0xC,
  31        0x2, 0xA, 0x6, 0xE,
  32        0x1, 0x9, 0x5, 0xD,
  33        0x3, 0xB, 0x7, 0xF
  34};
  35
  36static void write_grf5101(struct ieee80211_hw *dev, u8 addr, u32 data)
  37{
  38        struct rtl8180_priv *priv = dev->priv;
  39        u32 phy_config;
  40
  41        phy_config =  grf5101_encode[(data >> 8) & 0xF];
  42        phy_config |= grf5101_encode[(data >> 4) & 0xF] << 4;
  43        phy_config |= grf5101_encode[data & 0xF] << 8;
  44        phy_config |= grf5101_encode[(addr >> 1) & 0xF] << 12;
  45        phy_config |= (addr & 1) << 16;
  46        phy_config |= grf5101_encode[(data & 0xf000) >> 12] << 24;
  47
  48        /* MAC will bang bits to the chip */
  49        phy_config |= 0x90000000;
  50
  51        rtl818x_iowrite32(priv,
  52                (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
  53
  54        msleep(3);
  55}
  56
  57static void grf5101_write_phy_antenna(struct ieee80211_hw *dev, short chan)
  58{
  59        struct rtl8180_priv *priv = dev->priv;
  60        u8 ant = GRF5101_ANTENNA;
  61
  62        if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
  63                ant |= BB_ANTENNA_B;
  64
  65        if (chan == 14)
  66                ant |= BB_ANTATTEN_CHAN14;
  67
  68        rtl8180_write_phy(dev, 0x10, ant);
  69}
  70
  71static u8 grf5101_rf_calc_rssi(u8 agc, u8 sq)
  72{
  73        if (agc > 60)
  74                return 65;
  75
  76        /* TODO(?): just return agc (or agc + 5) to avoid mult / div */
  77        return 65 * agc / 60;
  78}
  79
  80static void grf5101_rf_set_channel(struct ieee80211_hw *dev,
  81                                   struct ieee80211_conf *conf)
  82{
  83        struct rtl8180_priv *priv = dev->priv;
  84        int channel =
  85                ieee80211_frequency_to_channel(conf->chandef.chan->center_freq);
  86        u32 txpw = priv->channels[channel - 1].hw_value & 0xFF;
  87        u32 chan = channel - 1;
  88
  89        /* set TX power */
  90        write_grf5101(dev, 0x15, 0x0);
  91        write_grf5101(dev, 0x06, txpw);
  92        write_grf5101(dev, 0x15, 0x10);
  93        write_grf5101(dev, 0x15, 0x0);
  94
  95        /* set frequency */
  96        write_grf5101(dev, 0x07, 0x0);
  97        write_grf5101(dev, 0x0B, chan);
  98        write_grf5101(dev, 0x07, 0x1000);
  99
 100        grf5101_write_phy_antenna(dev, channel);
 101}
 102
 103static void grf5101_rf_stop(struct ieee80211_hw *dev)
 104{
 105        struct rtl8180_priv *priv = dev->priv;
 106        u32 anaparam;
 107
 108        anaparam = priv->anaparam;
 109        anaparam &= 0x000fffff;
 110        anaparam |= 0x3f900000;
 111        rtl8180_set_anaparam(priv, anaparam);
 112
 113        write_grf5101(dev, 0x07, 0x0);
 114        write_grf5101(dev, 0x1f, 0x45);
 115        write_grf5101(dev, 0x1f, 0x5);
 116        write_grf5101(dev, 0x00, 0x8e4);
 117}
 118
 119static void grf5101_rf_init(struct ieee80211_hw *dev)
 120{
 121        struct rtl8180_priv *priv = dev->priv;
 122
 123        rtl8180_set_anaparam(priv, priv->anaparam);
 124
 125        write_grf5101(dev, 0x1f, 0x0);
 126        write_grf5101(dev, 0x1f, 0x0);
 127        write_grf5101(dev, 0x1f, 0x40);
 128        write_grf5101(dev, 0x1f, 0x60);
 129        write_grf5101(dev, 0x1f, 0x61);
 130        write_grf5101(dev, 0x1f, 0x61);
 131        write_grf5101(dev, 0x00, 0xae4);
 132        write_grf5101(dev, 0x1f, 0x1);
 133        write_grf5101(dev, 0x1f, 0x41);
 134        write_grf5101(dev, 0x1f, 0x61);
 135
 136        write_grf5101(dev, 0x01, 0x1a23);
 137        write_grf5101(dev, 0x02, 0x4971);
 138        write_grf5101(dev, 0x03, 0x41de);
 139        write_grf5101(dev, 0x04, 0x2d80);
 140        write_grf5101(dev, 0x05, 0x68ff);       /* 0x61ff original value */
 141        write_grf5101(dev, 0x06, 0x0);
 142        write_grf5101(dev, 0x07, 0x0);
 143        write_grf5101(dev, 0x08, 0x7533);
 144        write_grf5101(dev, 0x09, 0xc401);
 145        write_grf5101(dev, 0x0a, 0x0);
 146        write_grf5101(dev, 0x0c, 0x1c7);
 147        write_grf5101(dev, 0x0d, 0x29d3);
 148        write_grf5101(dev, 0x0e, 0x2e8);
 149        write_grf5101(dev, 0x10, 0x192);
 150        write_grf5101(dev, 0x11, 0x248);
 151        write_grf5101(dev, 0x12, 0x0);
 152        write_grf5101(dev, 0x13, 0x20c4);
 153        write_grf5101(dev, 0x14, 0xf4fc);
 154        write_grf5101(dev, 0x15, 0x0);
 155        write_grf5101(dev, 0x16, 0x1500);
 156
 157        write_grf5101(dev, 0x07, 0x1000);
 158
 159        /* baseband configuration */
 160        rtl8180_write_phy(dev, 0, 0xa8);
 161        rtl8180_write_phy(dev, 3, 0x0);
 162        rtl8180_write_phy(dev, 4, 0xc0);
 163        rtl8180_write_phy(dev, 5, 0x90);
 164        rtl8180_write_phy(dev, 6, 0x1e);
 165        rtl8180_write_phy(dev, 7, 0x64);
 166
 167        grf5101_write_phy_antenna(dev, 1);
 168
 169        rtl8180_write_phy(dev, 0x11, 0x88);
 170
 171        if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
 172            RTL818X_CONFIG2_ANTENNA_DIV)
 173                rtl8180_write_phy(dev, 0x12, 0xc0); /* enable ant diversity */
 174        else
 175                rtl8180_write_phy(dev, 0x12, 0x40); /* disable ant diversity */
 176
 177        rtl8180_write_phy(dev, 0x13, 0x90 | priv->csthreshold);
 178
 179        rtl8180_write_phy(dev, 0x19, 0x0);
 180        rtl8180_write_phy(dev, 0x1a, 0xa0);
 181        rtl8180_write_phy(dev, 0x1b, 0x44);
 182}
 183
 184const struct rtl818x_rf_ops grf5101_rf_ops = {
 185        .name           = "GCT",
 186        .init           = grf5101_rf_init,
 187        .stop           = grf5101_rf_stop,
 188        .set_chan       = grf5101_rf_set_channel,
 189        .calc_rssi      = grf5101_rf_calc_rssi,
 190};
 191