drivers/net/wireless/rtl818x/rtl8180/grf5101.c

   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/init.h>
  23 #include <linux/pci.h>
  24 #include <linux/delay.h>
  25 #include <net/mac80211.h>
  26
  27 #include "rtl8180.h"
  28 #include "grf5101.h"
  29
  30 static const int grf5101_encode[] = {
  31         0x0, 0x8, 0x4, 0xC,
  32         0x2, 0xA, 0x6, 0xE,
  33         0x1, 0x9, 0x5, 0xD,
  34         0x3, 0xB, 0x7, 0xF
  35 };
  36
  37 static void write_grf5101(struct ieee80211_hw *dev, u8 addr, u32 data)
  38 {
  39         struct rtl8180_priv *priv = dev->priv;
  40         u32 phy_config;
  41
  42         phy_config =  grf5101_encode[(data >> 8) & 0xF];
  43         phy_config |= grf5101_encode[(data >> 4) & 0xF] << 4;
  44         phy_config |= grf5101_encode[data & 0xF] << 8;
  45         phy_config |= grf5101_encode[(addr >> 1) & 0xF] << 12;
  46         phy_config |= (addr & 1) << 16;
  47         phy_config |= grf5101_encode[(data & 0xf000) >> 12] << 24;
  48
  49         /* MAC will bang bits to the chip */
  50         phy_config |= 0x90000000;
  51
  52         rtl818x_iowrite32(priv,
  53                 (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
  54
  55         msleep(3);
  56 }
  57
  58 static void grf5101_write_phy_antenna(struct ieee80211_hw *dev, short chan)
  59 {
  60         struct rtl8180_priv *priv = dev->priv;
  61         u8 ant = GRF5101_ANTENNA;
  62
  63         if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
  64                 ant |= BB_ANTENNA_B;
  65
  66         if (chan == 14)
  67                 ant |= BB_ANTATTEN_CHAN14;
  68
  69         rtl8180_write_phy(dev, 0x10, ant);
  70 }
  71
  72 static u8 grf5101_rf_calc_rssi(u8 agc, u8 sq)
  73 {
  74         if (agc > 60)
  75                 return 65;
  76
  77         /* TODO(?): just return agc (or agc + 5) to avoid mult / div */
  78         return 65 * agc / 60;
  79 }
  80
  81 static void grf5101_rf_set_channel(struct ieee80211_hw *dev,
  82                                    struct ieee80211_conf *conf)
  83 {
  84         struct rtl8180_priv *priv = dev->priv;
  85         int channel =
  86                 ieee80211_frequency_to_channel(conf->chandef.chan->center_freq);
  87         u32 txpw = priv->channels[channel - 1].hw_value & 0xFF;
  88         u32 chan = channel - 1;
  89
  90         /* set TX power */
  91         write_grf5101(dev, 0x15, 0x0);
  92         write_grf5101(dev, 0x06, txpw);
  93         write_grf5101(dev, 0x15, 0x10);
  94         write_grf5101(dev, 0x15, 0x0);
  95
  96         /* set frequency */
  97         write_grf5101(dev, 0x07, 0x0);
  98         write_grf5101(dev, 0x0B, chan);
  99         write_grf5101(dev, 0x07, 0x1000);
 100
 101         grf5101_write_phy_antenna(dev, channel);
 102 }
 103
 104 static void grf5101_rf_stop(struct ieee80211_hw *dev)
 105 {
 106         struct rtl8180_priv *priv = dev->priv;
 107         u32 anaparam;
 108
 109         anaparam = priv->anaparam;
 110         anaparam &= 0x000fffff;
 111         anaparam |= 0x3f900000;
 112         rtl8180_set_anaparam(priv, anaparam);
 113
 114         write_grf5101(dev, 0x07, 0x0);
 115         write_grf5101(dev, 0x1f, 0x45);
 116         write_grf5101(dev, 0x1f, 0x5);
 117         write_grf5101(dev, 0x00, 0x8e4);
 118 }
 119
 120 static void grf5101_rf_init(struct ieee80211_hw *dev)
 121 {
 122         struct rtl8180_priv *priv = dev->priv;
 123
 124         rtl8180_set_anaparam(priv, priv->anaparam);
 125
 126         write_grf5101(dev, 0x1f, 0x0);
 127         write_grf5101(dev, 0x1f, 0x0);
 128         write_grf5101(dev, 0x1f, 0x40);
 129         write_grf5101(dev, 0x1f, 0x60);
 130         write_grf5101(dev, 0x1f, 0x61);
 131         write_grf5101(dev, 0x1f, 0x61);
 132         write_grf5101(dev, 0x00, 0xae4);
 133         write_grf5101(dev, 0x1f, 0x1);
 134         write_grf5101(dev, 0x1f, 0x41);
 135         write_grf5101(dev, 0x1f, 0x61);
 136
 137         write_grf5101(dev, 0x01, 0x1a23);
 138         write_grf5101(dev, 0x02, 0x4971);
 139         write_grf5101(dev, 0x03, 0x41de);
 140         write_grf5101(dev, 0x04, 0x2d80);
 141         write_grf5101(dev, 0x05, 0x68ff);       /* 0x61ff original value */
 142         write_grf5101(dev, 0x06, 0x0);
 143         write_grf5101(dev, 0x07, 0x0);
 144         write_grf5101(dev, 0x08, 0x7533);
 145         write_grf5101(dev, 0x09, 0xc401);
 146         write_grf5101(dev, 0x0a, 0x0);
 147         write_grf5101(dev, 0x0c, 0x1c7);
 148         write_grf5101(dev, 0x0d, 0x29d3);
 149         write_grf5101(dev, 0x0e, 0x2e8);
 150         write_grf5101(dev, 0x10, 0x192);
 151         write_grf5101(dev, 0x11, 0x248);
 152         write_grf5101(dev, 0x12, 0x0);
 153         write_grf5101(dev, 0x13, 0x20c4);
 154         write_grf5101(dev, 0x14, 0xf4fc);
 155         write_grf5101(dev, 0x15, 0x0);
 156         write_grf5101(dev, 0x16, 0x1500);
 157
 158         write_grf5101(dev, 0x07, 0x1000);
 159
 160         /* baseband configuration */
 161         rtl8180_write_phy(dev, 0, 0xa8);
 162         rtl8180_write_phy(dev, 3, 0x0);
 163         rtl8180_write_phy(dev, 4, 0xc0);
 164         rtl8180_write_phy(dev, 5, 0x90);
 165         rtl8180_write_phy(dev, 6, 0x1e);
 166         rtl8180_write_phy(dev, 7, 0x64);
 167
 168         grf5101_write_phy_antenna(dev, 1);
 169
 170         rtl8180_write_phy(dev, 0x11, 0x88);
 171
 172         if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
 173             RTL818X_CONFIG2_ANTENNA_DIV)
 174                 rtl8180_write_phy(dev, 0x12, 0xc0); /* enable ant diversity */
 175         else
 176                 rtl8180_write_phy(dev, 0x12, 0x40); /* disable ant diversity */
 177
 178         rtl8180_write_phy(dev, 0x13, 0x90 | priv->csthreshold);
 179
 180         rtl8180_write_phy(dev, 0x19, 0x0);
 181         rtl8180_write_phy(dev, 0x1a, 0xa0);
 182         rtl8180_write_phy(dev, 0x1b, 0x44);
 183 }
 184
 185 const struct rtl818x_rf_ops grf5101_rf_ops = {
 186         .name           = "GCT",
 187         .init           = grf5101_rf_init,
 188         .stop           = grf5101_rf_stop,
 189         .set_chan       = grf5101_rf_set_channel,
 190         .calc_rssi      = grf5101_rf_calc_rssi,
 191 };