2 * Radio tuning for Maxim max2820 on RTL8180
4 * Copyright 2007 Andrea Merello <andrea.merello@gmail.com>
6 * Code from the BSD driver and the rtl8181 project have been
7 * very useful to understand certain things
9 * I want to thanks the Authors of such projects and the Ndiswrapper
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!
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.
21 #include <linux/pci.h>
22 #include <linux/delay.h>
23 #include <net/mac80211.h>
28 static const u32 max2820_chan[] = {
45 static void write_max2820(struct ieee80211_hw *dev, u8 addr, u32 data)
47 struct rtl8180_priv *priv = dev->priv;
50 phy_config = 0x90 + (data & 0xf);
54 phy_config += (data >> 4) & 0xff;
56 rtl818x_iowrite32(priv,
57 (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
62 static void max2820_write_phy_antenna(struct ieee80211_hw *dev, short chan)
64 struct rtl8180_priv *priv = dev->priv;
68 if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
71 ant |= BB_ANTATTEN_CHAN14;
73 rtl8180_write_phy(dev, 0x10, ant);
76 static u8 max2820_rf_calc_rssi(u8 agc, u8 sq)
88 /* TODO: change addends above to avoid mult / div below */
89 return 65 * agc / 100;
92 static void max2820_rf_set_channel(struct ieee80211_hw *dev,
93 struct ieee80211_conf *conf)
95 struct rtl8180_priv *priv = dev->priv;
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];
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);
106 max2820_write_phy_antenna(dev, channel);
107 write_max2820(dev, 3, chan);
110 static void max2820_rf_stop(struct ieee80211_hw *dev)
112 rtl8180_write_phy(dev, 3, 0x8);
113 write_max2820(dev, 1, 0);
117 static void max2820_rf_init(struct ieee80211_hw *dev)
119 struct rtl8180_priv *priv = dev->priv;
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 */
126 max2820_rf_set_channel(dev, NULL);
128 write_max2820(dev, 4, 0x313); /* rx register */
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..
134 write_max2820(dev, 5, 0x00f);
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 */
144 max2820_write_phy_antenna(dev, 1);
146 rtl8180_write_phy(dev, 0x11, 0x88); /* trl */
148 if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
149 RTL818X_CONFIG2_ANTENNA_DIV)
150 rtl8180_write_phy(dev, 0x12, 0xc7);
152 rtl8180_write_phy(dev, 0x12, 0x47);
154 rtl8180_write_phy(dev, 0x13, 0x9b);
156 rtl8180_write_phy(dev, 0x19, 0x0); /* CHESTLIM */
157 rtl8180_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM */
159 max2820_rf_set_channel(dev, NULL);
162 const struct rtl818x_rf_ops max2820_rf_ops = {
164 .init = max2820_rf_init,
165 .stop = max2820_rf_stop,
166 .set_chan = max2820_rf_set_channel,
167 .calc_rssi = max2820_rf_calc_rssi,