LXR linux/drivers/net/wireless/realtek/rtl818x/rtl8180/max2820.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Radio tuning for Maxim max2820 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
  18#include <linux/pci.h>
  19#include <linux/delay.h>
  20#include <net/mac80211.h>
  21
  22#include "rtl8180.h"
  23#include "max2820.h"
  24
  25static const u32 max2820_chan[] = {
  26        12, /* CH 1 */
  27        17,
  28        22,
  29        27,
  30        32,
  31        37,
  32        42,
  33        47,
  34        52,
  35        57,
  36        62,
  37        67,
  38        72,
  39        84, /* CH 14 */
  40};
  41
  42static void write_max2820(struct ieee80211_hw *dev, u8 addr, u32 data)
  43{
  44        struct rtl8180_priv *priv = dev->priv;
  45        u32 phy_config;
  46
  47        phy_config = 0x90 + (data & 0xf);
  48        phy_config <<= 16;
  49        phy_config += addr;
  50        phy_config <<= 8;
  51        phy_config += (data >> 4) & 0xff;
  52
  53        rtl818x_iowrite32(priv,
  54                (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
  55
  56        msleep(1);
  57}
  58
  59static void max2820_write_phy_antenna(struct ieee80211_hw *dev, short chan)
  60{
  61        struct rtl8180_priv *priv = dev->priv;
  62        u8 ant;
  63
  64        ant = MAXIM_ANTENNA;
  65        if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
  66                ant |= BB_ANTENNA_B;
  67        if (chan == 14)
  68                ant |= BB_ANTATTEN_CHAN14;
  69
  70        rtl8180_write_phy(dev, 0x10, ant);
  71}
  72
  73static u8 max2820_rf_calc_rssi(u8 agc, u8 sq)
  74{
  75        bool odd;
  76
  77        odd = !!(agc & 1);
  78
  79        agc >>= 1;
  80        if (odd)
  81                agc += 76;
  82        else
  83                agc += 66;
  84
  85        /* TODO: change addends above to avoid mult / div below */
  86        return 65 * agc / 100;
  87}
  88
  89static void max2820_rf_set_channel(struct ieee80211_hw *dev,
  90                                   struct ieee80211_conf *conf)
  91{
  92        struct rtl8180_priv *priv = dev->priv;
  93        int channel = conf ?
  94                ieee80211_frequency_to_channel(conf->chandef.chan->center_freq) : 1;
  95        unsigned int chan_idx = channel - 1;
  96        u32 txpw = priv->channels[chan_idx].hw_value & 0xFF;
  97        u32 chan = max2820_chan[chan_idx];
  98
  99        /* While philips SA2400 drive the PA bias from
 100         * sa2400, for MAXIM we do this directly from BB */
 101        rtl8180_write_phy(dev, 3, txpw);
 102
 103        max2820_write_phy_antenna(dev, channel);
 104        write_max2820(dev, 3, chan);
 105}
 106
 107static void max2820_rf_stop(struct ieee80211_hw *dev)
 108{
 109        rtl8180_write_phy(dev, 3, 0x8);
 110        write_max2820(dev, 1, 0);
 111}
 112
 113
 114static void max2820_rf_init(struct ieee80211_hw *dev)
 115{
 116        struct rtl8180_priv *priv = dev->priv;
 117
 118        /* MAXIM from netbsd driver */
 119        write_max2820(dev, 0, 0x007); /* test mode as indicated in datasheet */
 120        write_max2820(dev, 1, 0x01e); /* enable register */
 121        write_max2820(dev, 2, 0x001); /* synt register */
 122
 123        max2820_rf_set_channel(dev, NULL);
 124
 125        write_max2820(dev, 4, 0x313); /* rx register */
 126
 127        /* PA is driven directly by the BB, we keep the MAXIM bias
 128         * at the highest value in case that setting it to lower
 129         * values may introduce some further attenuation somewhere..
 130         */
 131        write_max2820(dev, 5, 0x00f);
 132
 133        /* baseband configuration */
 134        rtl8180_write_phy(dev, 0, 0x88); /* sys1       */
 135        rtl8180_write_phy(dev, 3, 0x08); /* txagc      */
 136        rtl8180_write_phy(dev, 4, 0xf8); /* lnadet     */
 137        rtl8180_write_phy(dev, 5, 0x90); /* ifagcinit  */
 138        rtl8180_write_phy(dev, 6, 0x1a); /* ifagclimit */
 139        rtl8180_write_phy(dev, 7, 0x64); /* ifagcdet   */
 140
 141        max2820_write_phy_antenna(dev, 1);
 142
 143        rtl8180_write_phy(dev, 0x11, 0x88); /* trl */
 144
 145        if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
 146            RTL818X_CONFIG2_ANTENNA_DIV)
 147                rtl8180_write_phy(dev, 0x12, 0xc7);
 148        else
 149                rtl8180_write_phy(dev, 0x12, 0x47);
 150
 151        rtl8180_write_phy(dev, 0x13, 0x9b);
 152
 153        rtl8180_write_phy(dev, 0x19, 0x0);  /* CHESTLIM */
 154        rtl8180_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM  */
 155
 156        max2820_rf_set_channel(dev, NULL);
 157}
 158
 159const struct rtl818x_rf_ops max2820_rf_ops = {
 160        .name           = "Maxim",
 161        .init           = max2820_rf_init,
 162        .stop           = max2820_rf_stop,
 163        .set_chan       = max2820_rf_set_channel,
 164        .calc_rssi      = max2820_rf_calc_rssi,
 165};
 166