LXR linux/drivers/net/wireless/realtek/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
  28static 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
  45static 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
  62static 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
  76static 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
  92static 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
 110static 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
 117static 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
 162const 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};
 169