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

   1 /*
   2  * Radio tuning for Maxim max2820 on RTL8180
   3  *
   4  * Copyright 2007 Andrea Merello <andreamrl@tiscali.it>
   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/init.h>
  22 #include <linux/pci.h>
  23 #include <linux/delay.h>
  24 #include <net/mac80211.h>
  25
  26 #include "rtl8180.h"
  27 #include "max2820.h"
  28
  29 static const u32 max2820_chan[] = {
  30         12, /* CH 1 */
  31         17,
  32         22,
  33         27,
  34         32,
  35         37,
  36         42,
  37         47,
  38         52,
  39         57,
  40         62,
  41         67,
  42         72,
  43         84, /* CH 14 */
  44 };
  45
  46 static void write_max2820(struct ieee80211_hw *dev, u8 addr, u32 data)
  47 {
  48         struct rtl8180_priv *priv = dev->priv;
  49         u32 phy_config;
  50
  51         phy_config = 0x90 + (data & 0xf);
  52         phy_config <<= 16;
  53         phy_config += addr;
  54         phy_config <<= 8;
  55         phy_config += (data >> 4) & 0xff;
  56
  57         rtl818x_iowrite32(priv,
  58                 (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
  59
  60         msleep(1);
  61 }
  62
  63 static void max2820_write_phy_antenna(struct ieee80211_hw *dev, short chan)
  64 {
  65         struct rtl8180_priv *priv = dev->priv;
  66         u8 ant;
  67
  68         ant = MAXIM_ANTENNA;
  69         if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
  70                 ant |= BB_ANTENNA_B;
  71         if (chan == 14)
  72                 ant |= BB_ANTATTEN_CHAN14;
  73
  74         rtl8180_write_phy(dev, 0x10, ant);
  75 }
  76
  77 static u8 max2820_rf_calc_rssi(u8 agc, u8 sq)
  78 {
  79         bool odd;
  80
  81         odd = !!(agc & 1);
  82
  83         agc >>= 1;
  84         if (odd)
  85                 agc += 76;
  86         else
  87                 agc += 66;
  88
  89         /* TODO: change addends above to avoid mult / div below */
  90         return 65 * agc / 100;
  91 }
  92
  93 static void max2820_rf_set_channel(struct ieee80211_hw *dev,
  94                                    struct ieee80211_conf *conf)
  95 {
  96         struct rtl8180_priv *priv = dev->priv;
  97         int channel = conf ?
  98                 ieee80211_frequency_to_channel(conf->channel->center_freq) : 1;
  99         unsigned int chan_idx = channel - 1;
 100         u32 txpw = priv->channels[chan_idx].hw_value & 0xFF;
 101         u32 chan = max2820_chan[chan_idx];
 102
 103         /* While philips SA2400 drive the PA bias from
 104          * sa2400, for MAXIM we do this directly from BB */
 105         rtl8180_write_phy(dev, 3, txpw);
 106
 107         max2820_write_phy_antenna(dev, channel);
 108         write_max2820(dev, 3, chan);
 109 }
 110
 111 static void max2820_rf_stop(struct ieee80211_hw *dev)
 112 {
 113         rtl8180_write_phy(dev, 3, 0x8);
 114         write_max2820(dev, 1, 0);
 115 }
 116
 117
 118 static void max2820_rf_init(struct ieee80211_hw *dev)
 119 {
 120         struct rtl8180_priv *priv = dev->priv;
 121
 122         /* MAXIM from netbsd driver */
 123         write_max2820(dev, 0, 0x007); /* test mode as indicated in datasheet */
 124         write_max2820(dev, 1, 0x01e); /* enable register */
 125         write_max2820(dev, 2, 0x001); /* synt register */
 126
 127         max2820_rf_set_channel(dev, NULL);
 128
 129         write_max2820(dev, 4, 0x313); /* rx register */
 130
 131         /* PA is driven directly by the BB, we keep the MAXIM bias
 132          * at the highest value in case that setting it to lower
 133          * values may introduce some further attenuation somewhere..
 134          */
 135         write_max2820(dev, 5, 0x00f);
 136
 137         /* baseband configuration */
 138         rtl8180_write_phy(dev, 0, 0x88); /* sys1       */
 139         rtl8180_write_phy(dev, 3, 0x08); /* txagc      */
 140         rtl8180_write_phy(dev, 4, 0xf8); /* lnadet     */
 141         rtl8180_write_phy(dev, 5, 0x90); /* ifagcinit  */
 142         rtl8180_write_phy(dev, 6, 0x1a); /* ifagclimit */
 143         rtl8180_write_phy(dev, 7, 0x64); /* ifagcdet   */
 144
 145         max2820_write_phy_antenna(dev, 1);
 146
 147         rtl8180_write_phy(dev, 0x11, 0x88); /* trl */
 148
 149         if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
 150             RTL818X_CONFIG2_ANTENNA_DIV)
 151                 rtl8180_write_phy(dev, 0x12, 0xc7);
 152         else
 153                 rtl8180_write_phy(dev, 0x12, 0x47);
 154
 155         rtl8180_write_phy(dev, 0x13, 0x9b);
 156
 157         rtl8180_write_phy(dev, 0x19, 0x0);  /* CHESTLIM */
 158         rtl8180_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM  */
 159
 160         max2820_rf_set_channel(dev, NULL);
 161 }
 162
 163 const struct rtl818x_rf_ops max2820_rf_ops = {
 164         .name           = "Maxim",
 165         .init           = max2820_rf_init,
 166         .stop           = max2820_rf_stop,
 167         .set_chan       = max2820_rf_set_channel,
 168         .calc_rssi      = max2820_rf_calc_rssi,
 169 };