LXR linux/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/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
  29static 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
  46static 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
  63static 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
  77static 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
  93static 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->chandef.chan->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
 111static 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
 118static 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
 163const 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};
 170