1 // SPDX-License-Identifier: GPL-2.0-only
3 * Radio tuning for Maxim max2820 on RTL8180
5 * Copyright 2007 Andrea Merello <andrea.merello@gmail.com>
7 * Code from the BSD driver and the rtl8181 project have been
8 * very useful to understand certain things
10 * I want to thanks the Authors of such projects and the Ndiswrapper
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!
18 #include <linux/pci.h>
19 #include <linux/delay.h>
20 #include <net/mac80211.h>
25 static const u32 max2820_chan[] = {
42 static void write_max2820(struct ieee80211_hw *dev, u8 addr, u32 data)
44 struct rtl8180_priv *priv = dev->priv;
47 phy_config = 0x90 + (data & 0xf);
51 phy_config += (data >> 4) & 0xff;
53 rtl818x_iowrite32(priv,
54 (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
59 static void max2820_write_phy_antenna(struct ieee80211_hw *dev, short chan)
61 struct rtl8180_priv *priv = dev->priv;
65 if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
68 ant |= BB_ANTATTEN_CHAN14;
70 rtl8180_write_phy(dev, 0x10, ant);
73 static u8 max2820_rf_calc_rssi(u8 agc, u8 sq)
85 /* TODO: change addends above to avoid mult / div below */
86 return 65 * agc / 100;
89 static void max2820_rf_set_channel(struct ieee80211_hw *dev,
90 struct ieee80211_conf *conf)
92 struct rtl8180_priv *priv = dev->priv;
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];
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);
103 max2820_write_phy_antenna(dev, channel);
104 write_max2820(dev, 3, chan);
107 static void max2820_rf_stop(struct ieee80211_hw *dev)
109 rtl8180_write_phy(dev, 3, 0x8);
110 write_max2820(dev, 1, 0);
114 static void max2820_rf_init(struct ieee80211_hw *dev)
116 struct rtl8180_priv *priv = dev->priv;
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 */
123 max2820_rf_set_channel(dev, NULL);
125 write_max2820(dev, 4, 0x313); /* rx register */
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..
131 write_max2820(dev, 5, 0x00f);
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 */
141 max2820_write_phy_antenna(dev, 1);
143 rtl8180_write_phy(dev, 0x11, 0x88); /* trl */
145 if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
146 RTL818X_CONFIG2_ANTENNA_DIV)
147 rtl8180_write_phy(dev, 0x12, 0xc7);
149 rtl8180_write_phy(dev, 0x12, 0x47);
151 rtl8180_write_phy(dev, 0x13, 0x9b);
153 rtl8180_write_phy(dev, 0x19, 0x0); /* CHESTLIM */
154 rtl8180_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM */
156 max2820_rf_set_channel(dev, NULL);
159 const struct rtl818x_rf_ops max2820_rf_ops = {
161 .init = max2820_rf_init,
162 .stop = max2820_rf_stop,
163 .set_chan = max2820_rf_set_channel,
164 .calc_rssi = max2820_rf_calc_rssi,