1 /* 2 * Radio tuning for Maxim max2820 on RTL8180 3 * 4 * Copyright 2007 Andrea Merello <andreamrl (at) tiscali.it> 5 * 6 * Modified slightly for gPXE, June 2009 by Joshua Oreman. 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 * This program is free software; you can redistribute it and/or modify 19 * it under the terms of the GNU General Public License version 2 as 20 * published by the Free Software Foundation. 21 */ 22 23 #include <unistd.h> 24 #include <gpxe/pci.h> 25 #include <gpxe/net80211.h> 26 27 #include "rtl818x.h" 28 29 FILE_LICENCE(GPL2_ONLY); 30 31 #define MAXIM_ANTENNA 0xb3 32 33 static const u32 max2820_chan[] = { 34 12, /* CH 1 */ 35 17, 36 22, 37 27, 38 32, 39 37, 40 42, 41 47, 42 52, 43 57, 44 62, 45 67, 46 72, 47 84, /* CH 14 */ 48 }; 49 50 static void write_max2820(struct net80211_device *dev, u8 addr, u32 data) 51 { 52 struct rtl818x_priv *priv = dev->priv; 53 u32 phy_config; 54 55 phy_config = 0x90 + (data & 0xf); 56 phy_config <<= 16; 57 phy_config += addr; 58 phy_config <<= 8; 59 phy_config += (data >> 4) & 0xff; 60 61 /* This was originally a 32-bit write to a typecast 62 RFPinsOutput, but gcc complained about aliasing rules. -JBO */ 63 rtl818x_iowrite16(priv, &priv->map->RFPinsOutput, phy_config & 0xffff); 64 rtl818x_iowrite16(priv, &priv->map->RFPinsEnable, phy_config >> 16); 65 66 mdelay(1); 67 } 68 69 static void max2820_write_phy_antenna(struct net80211_device *dev, short chan) 70 { 71 struct rtl818x_priv *priv = dev->priv; 72 u8 ant; 73 74 ant = MAXIM_ANTENNA; 75 if (priv->rfparam & RF_PARAM_ANTBDEFAULT) 76 ant |= BB_ANTENNA_B; 77 if (chan == 14) 78 ant |= BB_ANTATTEN_CHAN14; 79 80 rtl818x_write_phy(dev, 0x10, ant); 81 } 82 83 static void max2820_rf_set_channel(struct net80211_device *dev, 84 struct net80211_channel *channelp) 85 { 86 struct rtl818x_priv *priv = dev->priv; 87 int channel = channelp->channel_nr; 88 unsigned int chan_idx = channel - 1; 89 u32 txpw = priv->txpower[chan_idx] & 0xFF; 90 u32 chan = max2820_chan[chan_idx]; 91 92 /* While philips SA2400 drive the PA bias from 93 * sa2400, for MAXIM we do this directly from BB */ 94 rtl818x_write_phy(dev, 3, txpw); 95 96 max2820_write_phy_antenna(dev, channel); 97 write_max2820(dev, 3, chan); 98 } 99 100 static void max2820_rf_stop(struct net80211_device *dev) 101 { 102 rtl818x_write_phy(dev, 3, 0x8); 103 write_max2820(dev, 1, 0); 104 } 105 106 107 static void max2820_rf_init(struct net80211_device *dev) 108 { 109 struct rtl818x_priv *priv = dev->priv; 110 111 /* MAXIM from netbsd driver */ 112 write_max2820(dev, 0, 0x007); /* test mode as indicated in datasheet */ 113 write_max2820(dev, 1, 0x01e); /* enable register */ 114 write_max2820(dev, 2, 0x001); /* synt register */ 115 116 max2820_rf_set_channel(dev, NULL); 117 118 write_max2820(dev, 4, 0x313); /* rx register */ 119 120 /* PA is driven directly by the BB, we keep the MAXIM bias 121 * at the highest value in case that setting it to lower 122 * values may introduce some further attenuation somewhere.. 123 */ 124 write_max2820(dev, 5, 0x00f); 125 126 /* baseband configuration */ 127 rtl818x_write_phy(dev, 0, 0x88); /* sys1 */ 128 rtl818x_write_phy(dev, 3, 0x08); /* txagc */ 129 rtl818x_write_phy(dev, 4, 0xf8); /* lnadet */ 130 rtl818x_write_phy(dev, 5, 0x90); /* ifagcinit */ 131 rtl818x_write_phy(dev, 6, 0x1a); /* ifagclimit */ 132 rtl818x_write_phy(dev, 7, 0x64); /* ifagcdet */ 133 134 max2820_write_phy_antenna(dev, 1); 135 136 rtl818x_write_phy(dev, 0x11, 0x88); /* trl */ 137 138 if (rtl818x_ioread8(priv, &priv->map->CONFIG2) & 139 RTL818X_CONFIG2_ANTENNA_DIV) 140 rtl818x_write_phy(dev, 0x12, 0xc7); 141 else 142 rtl818x_write_phy(dev, 0x12, 0x47); 143 144 rtl818x_write_phy(dev, 0x13, 0x9b); 145 146 rtl818x_write_phy(dev, 0x19, 0x0); /* CHESTLIM */ 147 rtl818x_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM */ 148 149 max2820_rf_set_channel(dev, NULL); 150 } 151 152 struct rtl818x_rf_ops max2820_rf_ops __rtl818x_rf_driver = { 153 .name = "Maxim max2820", 154 .id = 4, 155 .init = max2820_rf_init, 156 .stop = max2820_rf_stop, 157 .set_chan = max2820_rf_set_channel 158 }; 159
