drivers/net/wireless/rtl818x/rtl8180/max2820.c

   1 /*
   2  * Radio tuning for Maxim max2820 on RTL8180
   3  *
   4  * Copyright 2007 Andrea Merello <andrea.merello@gmail.com>
   5  *
   6  * Code from the BSD driver and the rtl8181 project have been
   7  * very useful to understand certain things
   8  *
   9  * I want to thanks the Authors of such projects and the Ndiswrapper
  10  * project Authors.
  11  *
  12  * A special Big Thanks also is for all people who donated me cards,
  13  * making possible the creation of the original rtl8180 driver
  14  * from which this code is derived!
  15  *
  16  * This program is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU General Public License version 2 as
  18  * published by the Free Software Foundation.
  19  */
  20
  21 #include <linux/pci.h>
  22 #include <linux/delay.h>
  23 #include <net/mac80211.h>
  24
  25 #include "rtl8180.h"
  26 #include "max2820.h"
  27
  28 static const u32 max2820_chan[] = {
  29         12, /* CH 1 */
  30         17,
  31         22,
  32         27,
  33         32,
  34         37,
  35         42,
  36         47,
  37         52,
  38         57,
  39         62,
  40         67,
  41         72,
  42         84, /* CH 14 */
  43 };
  44
  45 static void write_max2820(struct ieee80211_hw *dev, u8 addr, u32 data)
  46 {
  47         struct rtl8180_priv *priv = dev->priv;
  48         u32 phy_config;
  49
  50         phy_config = 0x90 + (data & 0xf);
  51         phy_config <<= 16;
  52         phy_config += addr;
  53         phy_config <<= 8;
  54         phy_config += (data >> 4) & 0xff;
  55
  56         rtl818x_iowrite32(priv,
  57                 (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
  58
  59         msleep(1);
  60 }
  61
  62 static void max2820_write_phy_antenna(struct ieee80211_hw *dev, short chan)
  63 {
  64         struct rtl8180_priv *priv = dev->priv;
  65         u8 ant;
  66
  67         ant = MAXIM_ANTENNA;
  68         if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
  69                 ant |= BB_ANTENNA_B;
  70         if (chan == 14)
  71                 ant |= BB_ANTATTEN_CHAN14;
  72
  73         rtl8180_write_phy(dev, 0x10, ant);
  74 }
  75
  76 static u8 max2820_rf_calc_rssi(u8 agc, u8 sq)
  77 {
  78         bool odd;
  79
  80         odd = !!(agc & 1);
  81
  82         agc >>= 1;
  83         if (odd)
  84                 agc += 76;
  85         else
  86                 agc += 66;
  87
  88         /* TODO: change addends above to avoid mult / div below */
  89         return 65 * agc / 100;
  90 }
  91
  92 static void max2820_rf_set_channel(struct ieee80211_hw *dev,
  93                                    struct ieee80211_conf *conf)
  94 {
  95         struct rtl8180_priv *priv = dev->priv;
  96         int channel = conf ?
  97                 ieee80211_frequency_to_channel(conf->chandef.chan->center_freq) : 1;
  98         unsigned int chan_idx = channel - 1;
  99         u32 txpw = priv->channels[chan_idx].hw_value & 0xFF;
 100         u32 chan = max2820_chan[chan_idx];
 101
 102         /* While philips SA2400 drive the PA bias from
 103          * sa2400, for MAXIM we do this directly from BB */
 104         rtl8180_write_phy(dev, 3, txpw);
 105
 106         max2820_write_phy_antenna(dev, channel);
 107         write_max2820(dev, 3, chan);
 108 }
 109
 110 static void max2820_rf_stop(struct ieee80211_hw *dev)
 111 {
 112         rtl8180_write_phy(dev, 3, 0x8);
 113         write_max2820(dev, 1, 0);
 114 }
 115
 116
 117 static void max2820_rf_init(struct ieee80211_hw *dev)
 118 {
 119         struct rtl8180_priv *priv = dev->priv;
 120
 121         /* MAXIM from netbsd driver */
 122         write_max2820(dev, 0, 0x007); /* test mode as indicated in datasheet */
 123         write_max2820(dev, 1, 0x01e); /* enable register */
 124         write_max2820(dev, 2, 0x001); /* synt register */
 125
 126         max2820_rf_set_channel(dev, NULL);
 127
 128         write_max2820(dev, 4, 0x313); /* rx register */
 129
 130         /* PA is driven directly by the BB, we keep the MAXIM bias
 131          * at the highest value in case that setting it to lower
 132          * values may introduce some further attenuation somewhere..
 133          */
 134         write_max2820(dev, 5, 0x00f);
 135
 136         /* baseband configuration */
 137         rtl8180_write_phy(dev, 0, 0x88); /* sys1       */
 138         rtl8180_write_phy(dev, 3, 0x08); /* txagc      */
 139         rtl8180_write_phy(dev, 4, 0xf8); /* lnadet     */
 140         rtl8180_write_phy(dev, 5, 0x90); /* ifagcinit  */
 141         rtl8180_write_phy(dev, 6, 0x1a); /* ifagclimit */
 142         rtl8180_write_phy(dev, 7, 0x64); /* ifagcdet   */
 143
 144         max2820_write_phy_antenna(dev, 1);
 145
 146         rtl8180_write_phy(dev, 0x11, 0x88); /* trl */
 147
 148         if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
 149             RTL818X_CONFIG2_ANTENNA_DIV)
 150                 rtl8180_write_phy(dev, 0x12, 0xc7);
 151         else
 152                 rtl8180_write_phy(dev, 0x12, 0x47);
 153
 154         rtl8180_write_phy(dev, 0x13, 0x9b);
 155
 156         rtl8180_write_phy(dev, 0x19, 0x0);  /* CHESTLIM */
 157         rtl8180_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM  */
 158
 159         max2820_rf_set_channel(dev, NULL);
 160 }
 161
 162 const struct rtl818x_rf_ops max2820_rf_ops = {
 163         .name           = "Maxim",
 164         .init           = max2820_rf_init,
 165         .stop           = max2820_rf_stop,
 166         .set_chan       = max2820_rf_set_channel,
 167         .calc_rssi      = max2820_rf_calc_rssi,
 168 };