1 // SPDX-License-Identifier: GPL-2.0-only 2 3 /* 4 * Radio tuning for GCT GRF5101 on RTL8180 5 * 6 * Copyright 2007 Andrea Merello <andrea.merello@gmail.com> 7 * 8 * Code from the BSD driver and the rtl8181 project have been 9 * very useful to understand certain things 10 * 11 * I want to thanks the Authors of such projects and the Ndiswrapper 12 * project Authors. 13 * 14 * A special Big Thanks also is for all people who donated me cards, 15 * making possible the creation of the original rtl8180 driver 16 * from which this code is derived! 17 */ 18 19 #include <linux/pci.h> 20 #include <linux/delay.h> 21 #include <net/mac80211.h> 22 23 #include "rtl8180.h" 24 #include "grf5101.h" 25 26 static const int grf5101_encode[] = { 27 0x0, 0x8, 0x4, 0xC, 28 0x2, 0xA, 0x6, 0xE, 29 0x1, 0x9, 0x5, 0xD, 30 0x3, 0xB, 0x7, 0xF 31 }; 32 33 static void write_grf5101(struct ieee80211_hw *dev, u8 addr, u32 data) 34 { 35 struct rtl8180_priv *priv = dev->priv; 36 u32 phy_config; 37 38 phy_config = grf5101_encode[(data >> 8) & 0xF]; 39 phy_config |= grf5101_encode[(data >> 4) & 0xF] << 4; 40 phy_config |= grf5101_encode[data & 0xF] << 8; 41 phy_config |= grf5101_encode[(addr >> 1) & 0xF] << 12; 42 phy_config |= (addr & 1) << 16; 43 phy_config |= grf5101_encode[(data & 0xf000) >> 12] << 24; 44 45 /* MAC will bang bits to the chip */ 46 phy_config |= 0x90000000; 47 48 rtl818x_iowrite32(priv, 49 (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config); 50 51 msleep(3); 52 } 53 54 static void grf5101_write_phy_antenna(struct ieee80211_hw *dev, short chan) 55 { 56 struct rtl8180_priv *priv = dev->priv; 57 u8 ant = GRF5101_ANTENNA; 58 59 if (priv->rfparam & RF_PARAM_ANTBDEFAULT) 60 ant |= BB_ANTENNA_B; 61 62 if (chan == 14) 63 ant |= BB_ANTATTEN_CHAN14; 64 65 rtl8180_write_phy(dev, 0x10, ant); 66 } 67 68 static u8 grf5101_rf_calc_rssi(u8 agc, u8 sq) 69 { 70 if (agc > 60) 71 return 65; 72 73 /* TODO(?): just return agc (or agc + 5) to avoid mult / div */ 74 return 65 * agc / 60; 75 } 76 77 static void grf5101_rf_set_channel(struct ieee80211_hw *dev, 78 struct ieee80211_conf *conf) 79 { 80 struct rtl8180_priv *priv = dev->priv; 81 int channel = 82 ieee80211_frequency_to_channel(conf->chandef.chan->center_freq); 83 u32 txpw = priv->channels[channel - 1].hw_value & 0xFF; 84 u32 chan = channel - 1; 85 86 /* set TX power */ 87 write_grf5101(dev, 0x15, 0x0); 88 write_grf5101(dev, 0x06, txpw); 89 write_grf5101(dev, 0x15, 0x10); 90 write_grf5101(dev, 0x15, 0x0); 91 92 /* set frequency */ 93 write_grf5101(dev, 0x07, 0x0); 94 write_grf5101(dev, 0x0B, chan); 95 write_grf5101(dev, 0x07, 0x1000); 96 97 grf5101_write_phy_antenna(dev, channel); 98 } 99 100 static void grf5101_rf_stop(struct ieee80211_hw *dev) 101 { 102 struct rtl8180_priv *priv = dev->priv; 103 u32 anaparam; 104 105 anaparam = priv->anaparam; 106 anaparam &= 0x000fffff; 107 anaparam |= 0x3f900000; 108 rtl8180_set_anaparam(priv, anaparam); 109 110 write_grf5101(dev, 0x07, 0x0); 111 write_grf5101(dev, 0x1f, 0x45); 112 write_grf5101(dev, 0x1f, 0x5); 113 write_grf5101(dev, 0x00, 0x8e4); 114 } 115 116 static void grf5101_rf_init(struct ieee80211_hw *dev) 117 { 118 struct rtl8180_priv *priv = dev->priv; 119 120 rtl8180_set_anaparam(priv, priv->anaparam); 121 122 write_grf5101(dev, 0x1f, 0x0); 123 write_grf5101(dev, 0x1f, 0x0); 124 write_grf5101(dev, 0x1f, 0x40); 125 write_grf5101(dev, 0x1f, 0x60); 126 write_grf5101(dev, 0x1f, 0x61); 127 write_grf5101(dev, 0x1f, 0x61); 128 write_grf5101(dev, 0x00, 0xae4); 129 write_grf5101(dev, 0x1f, 0x1); 130 write_grf5101(dev, 0x1f, 0x41); 131 write_grf5101(dev, 0x1f, 0x61); 132 133 write_grf5101(dev, 0x01, 0x1a23); 134 write_grf5101(dev, 0x02, 0x4971); 135 write_grf5101(dev, 0x03, 0x41de); 136 write_grf5101(dev, 0x04, 0x2d80); 137 write_grf5101(dev, 0x05, 0x68ff); /* 0x61ff original value */ 138 write_grf5101(dev, 0x06, 0x0); 139 write_grf5101(dev, 0x07, 0x0); 140 write_grf5101(dev, 0x08, 0x7533); 141 write_grf5101(dev, 0x09, 0xc401); 142 write_grf5101(dev, 0x0a, 0x0); 143 write_grf5101(dev, 0x0c, 0x1c7); 144 write_grf5101(dev, 0x0d, 0x29d3); 145 write_grf5101(dev, 0x0e, 0x2e8); 146 write_grf5101(dev, 0x10, 0x192); 147 write_grf5101(dev, 0x11, 0x248); 148 write_grf5101(dev, 0x12, 0x0); 149 write_grf5101(dev, 0x13, 0x20c4); 150 write_grf5101(dev, 0x14, 0xf4fc); 151 write_grf5101(dev, 0x15, 0x0); 152 write_grf5101(dev, 0x16, 0x1500); 153 154 write_grf5101(dev, 0x07, 0x1000); 155 156 /* baseband configuration */ 157 rtl8180_write_phy(dev, 0, 0xa8); 158 rtl8180_write_phy(dev, 3, 0x0); 159 rtl8180_write_phy(dev, 4, 0xc0); 160 rtl8180_write_phy(dev, 5, 0x90); 161 rtl8180_write_phy(dev, 6, 0x1e); 162 rtl8180_write_phy(dev, 7, 0x64); 163 164 grf5101_write_phy_antenna(dev, 1); 165 166 rtl8180_write_phy(dev, 0x11, 0x88); 167 168 if (rtl818x_ioread8(priv, &priv->map->CONFIG2) & 169 RTL818X_CONFIG2_ANTENNA_DIV) 170 rtl8180_write_phy(dev, 0x12, 0xc0); /* enable ant diversity */ 171 else 172 rtl8180_write_phy(dev, 0x12, 0x40); /* disable ant diversity */ 173 174 rtl8180_write_phy(dev, 0x13, 0x90 | priv->csthreshold); 175 176 rtl8180_write_phy(dev, 0x19, 0x0); 177 rtl8180_write_phy(dev, 0x1a, 0xa0); 178 rtl8180_write_phy(dev, 0x1b, 0x44); 179 } 180 181 const struct rtl818x_rf_ops grf5101_rf_ops = { 182 .name = "GCT", 183 .init = grf5101_rf_init, 184 .stop = grf5101_rf_stop, 185 .set_chan = grf5101_rf_set_channel, 186 .calc_rssi = grf5101_rf_calc_rssi, 187 }; 188