drivers/net/wireless/rtl818x/rtl8180/sa2400.c

   1
   2 /*
   3  * Radio tuning for Philips SA2400 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  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License version 2 as
  19  * published by the Free Software Foundation.
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/pci.h>
  24 #include <linux/delay.h>
  25 #include <net/mac80211.h>
  26
  27 #include "rtl8180.h"
  28 #include "sa2400.h"
  29
  30 static const u32 sa2400_chan[] = {
  31         0x00096c, /* ch1 */
  32         0x080970,
  33         0x100974,
  34         0x180978,
  35         0x000980,
  36         0x080984,
  37         0x100988,
  38         0x18098c,
  39         0x000994,
  40         0x080998,
  41         0x10099c,
  42         0x1809a0,
  43         0x0009a8,
  44         0x0009b4, /* ch 14 */
  45 };
  46
  47 static void write_sa2400(struct ieee80211_hw *dev, u8 addr, u32 data)
  48 {
  49         struct rtl8180_priv *priv = dev->priv;
  50         u32 phy_config;
  51
  52         /* MAC will bang bits to the sa2400. sw 3-wire is NOT used */
  53         phy_config = 0xb0000000;
  54
  55         phy_config |= ((u32)(addr & 0xf)) << 24;
  56         phy_config |= data & 0xffffff;
  57
  58         rtl818x_iowrite32(priv,
  59                 (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
  60
  61         msleep(3);
  62 }
  63
  64 static void sa2400_write_phy_antenna(struct ieee80211_hw *dev, short chan)
  65 {
  66         struct rtl8180_priv *priv = dev->priv;
  67         u8 ant = SA2400_ANTENNA;
  68
  69         if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
  70                 ant |= BB_ANTENNA_B;
  71
  72         if (chan == 14)
  73                 ant |= BB_ANTATTEN_CHAN14;
  74
  75         rtl8180_write_phy(dev, 0x10, ant);
  76
  77 }
  78
  79 static u8 sa2400_rf_rssi_map[] = {
  80         0x64, 0x64, 0x63, 0x62, 0x61, 0x60, 0x5f, 0x5e,
  81         0x5d, 0x5c, 0x5b, 0x5a, 0x57, 0x54, 0x52, 0x50,
  82         0x4e, 0x4c, 0x4a, 0x48, 0x46, 0x44, 0x41, 0x3f,
  83         0x3c, 0x3a, 0x37, 0x36, 0x36, 0x1c, 0x1c, 0x1b,
  84         0x1b, 0x1a, 0x1a, 0x19, 0x19, 0x18, 0x18, 0x17,
  85         0x17, 0x16, 0x16, 0x15, 0x15, 0x14, 0x14, 0x13,
  86         0x13, 0x12, 0x12, 0x11, 0x11, 0x10, 0x10, 0x0f,
  87         0x0f, 0x0e, 0x0e, 0x0d, 0x0d, 0x0c, 0x0c, 0x0b,
  88         0x0b, 0x0a, 0x0a, 0x09, 0x09, 0x08, 0x08, 0x07,
  89         0x07, 0x06, 0x06, 0x05, 0x04, 0x03, 0x02,
  90 };
  91
  92 static u8 sa2400_rf_calc_rssi(u8 agc, u8 sq)
  93 {
  94         if (sq == 0x80)
  95                 return 1;
  96
  97         if (sq > 78)
  98                 return 32;
  99
 100         /* TODO: recalc sa2400_rf_rssi_map to avoid mult / div */
 101         return 65 * sa2400_rf_rssi_map[sq] / 100;
 102 }
 103
 104 static void sa2400_rf_set_channel(struct ieee80211_hw *dev,
 105                                   struct ieee80211_conf *conf)
 106 {
 107         struct rtl8180_priv *priv = dev->priv;
 108         int channel =
 109                 ieee80211_frequency_to_channel(conf->chandef.chan->center_freq);
 110         u32 txpw = priv->channels[channel - 1].hw_value & 0xFF;
 111         u32 chan = sa2400_chan[channel - 1];
 112
 113         write_sa2400(dev, 7, txpw);
 114
 115         sa2400_write_phy_antenna(dev, channel);
 116
 117         write_sa2400(dev, 0, chan);
 118         write_sa2400(dev, 1, 0xbb50);
 119         write_sa2400(dev, 2, 0x80);
 120         write_sa2400(dev, 3, 0);
 121 }
 122
 123 static void sa2400_rf_stop(struct ieee80211_hw *dev)
 124 {
 125         write_sa2400(dev, 4, 0);
 126 }
 127
 128 static void sa2400_rf_init(struct ieee80211_hw *dev)
 129 {
 130         struct rtl8180_priv *priv = dev->priv;
 131         u32 anaparam, txconf;
 132         u8 firdac;
 133         int analogphy = priv->rfparam & RF_PARAM_ANALOGPHY;
 134
 135         anaparam = priv->anaparam;
 136         anaparam &= ~(1 << ANAPARAM_TXDACOFF_SHIFT);
 137         anaparam &= ~ANAPARAM_PWR1_MASK;
 138         anaparam &= ~ANAPARAM_PWR0_MASK;
 139
 140         if (analogphy) {
 141                 anaparam |= SA2400_ANA_ANAPARAM_PWR1_ON << ANAPARAM_PWR1_SHIFT;
 142                 firdac = 0;
 143         } else {
 144                 anaparam |= (SA2400_DIG_ANAPARAM_PWR1_ON << ANAPARAM_PWR1_SHIFT);
 145                 anaparam |= (SA2400_ANAPARAM_PWR0_ON << ANAPARAM_PWR0_SHIFT);
 146                 firdac = 1 << SA2400_REG4_FIRDAC_SHIFT;
 147         }
 148
 149         rtl8180_set_anaparam(priv, anaparam);
 150
 151         write_sa2400(dev, 0, sa2400_chan[0]);
 152         write_sa2400(dev, 1, 0xbb50);
 153         write_sa2400(dev, 2, 0x80);
 154         write_sa2400(dev, 3, 0);
 155         write_sa2400(dev, 4, 0x19340 | firdac);
 156         write_sa2400(dev, 5, 0x1dfb | (SA2400_MAX_SENS - 54) << 15);
 157         write_sa2400(dev, 4, 0x19348 | firdac); /* calibrate VCO */
 158
 159         if (!analogphy)
 160                 write_sa2400(dev, 4, 0x1938c); /*???*/
 161
 162         write_sa2400(dev, 4, 0x19340 | firdac);
 163
 164         write_sa2400(dev, 0, sa2400_chan[0]);
 165         write_sa2400(dev, 1, 0xbb50);
 166         write_sa2400(dev, 2, 0x80);
 167         write_sa2400(dev, 3, 0);
 168         write_sa2400(dev, 4, 0x19344 | firdac); /* calibrate filter */
 169
 170         /* new from rtl8180 embedded driver (rtl8181 project) */
 171         write_sa2400(dev, 6, 0x13ff | (1 << 23)); /* MANRX */
 172         write_sa2400(dev, 8, 0); /* VCO */
 173
 174         if (analogphy) {
 175                 rtl8180_set_anaparam(priv, anaparam |
 176                                      (1 << ANAPARAM_TXDACOFF_SHIFT));
 177
 178                 txconf = rtl818x_ioread32(priv, &priv->map->TX_CONF);
 179                 rtl818x_iowrite32(priv, &priv->map->TX_CONF,
 180                         txconf | RTL818X_TX_CONF_LOOPBACK_CONT);
 181
 182                 write_sa2400(dev, 4, 0x19341); /* calibrates DC */
 183
 184                 /* a 5us sleep is required here,
 185                  * we rely on the 3ms delay introduced in write_sa2400 */
 186                 write_sa2400(dev, 4, 0x19345);
 187
 188                 /* a 20us sleep is required here,
 189                  * we rely on the 3ms delay introduced in write_sa2400 */
 190
 191                 rtl818x_iowrite32(priv, &priv->map->TX_CONF, txconf);
 192
 193                 rtl8180_set_anaparam(priv, anaparam);
 194         }
 195         /* end new code */
 196
 197         write_sa2400(dev, 4, 0x19341 | firdac); /* RTX MODE */
 198
 199         /* baseband configuration */
 200         rtl8180_write_phy(dev, 0, 0x98);
 201         rtl8180_write_phy(dev, 3, 0x38);
 202         rtl8180_write_phy(dev, 4, 0xe0);
 203         rtl8180_write_phy(dev, 5, 0x90);
 204         rtl8180_write_phy(dev, 6, 0x1a);
 205         rtl8180_write_phy(dev, 7, 0x64);
 206
 207         sa2400_write_phy_antenna(dev, 1);
 208
 209         rtl8180_write_phy(dev, 0x11, 0x80);
 210
 211         if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
 212             RTL818X_CONFIG2_ANTENNA_DIV)
 213                 rtl8180_write_phy(dev, 0x12, 0xc7); /* enable ant diversity */
 214         else
 215                 rtl8180_write_phy(dev, 0x12, 0x47); /* disable ant diversity */
 216
 217         rtl8180_write_phy(dev, 0x13, 0x90 | priv->csthreshold);
 218
 219         rtl8180_write_phy(dev, 0x19, 0x0);
 220         rtl8180_write_phy(dev, 0x1a, 0xa0);
 221 }
 222
 223 const struct rtl818x_rf_ops sa2400_rf_ops = {
 224         .name           = "Philips",
 225         .init           = sa2400_rf_init,
 226         .stop           = sa2400_rf_stop,
 227         .set_chan       = sa2400_rf_set_channel,
 228         .calc_rssi      = sa2400_rf_calc_rssi,
 229 };