1 /*
2 * Radio tuning for Maxim max2820 on RTL8180
3 *
4 * Copyright 2007 Andrea Merello <andrea.merello@gmail.com>
5 *
6 * Code from the BSD driver and the rtl8181 project have been
7 * very useful to understand certain things
8 *
9 * I want to thanks the Authors of such projects and the Ndiswrapper
10 * project Authors.
11 *
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!
15 *
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.
19 */
20
21 #include <linux/pci.h>
22 #include <linux/delay.h>
23 #include <net/mac80211.h>
24
25 #include "rtl8180.h"
26 #include "max2820.h"
27
28 static const u32 max2820_chan[] = {
29 12, /* CH 1 */
30 17,
31 22,
32 27,
33 32,
34 37,
35 42,
36 47,
37 52,
38 57,
39 62,
40 67,
41 72,
42 84, /* CH 14 */
43 };
44
write_max2820(struct ieee80211_hw * dev,u8 addr,u32 data)45 static void write_max2820(struct ieee80211_hw *dev, u8 addr, u32 data)
46 {
47 struct rtl8180_priv *priv = dev->priv;
48 u32 phy_config;
49
50 phy_config = 0x90 + (data & 0xf);
51 phy_config <<= 16;
52 phy_config += addr;
53 phy_config <<= 8;
54 phy_config += (data >> 4) & 0xff;
55
56 rtl818x_iowrite32(priv,
57 (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
58
59 msleep(1);
60 }
61
max2820_write_phy_antenna(struct ieee80211_hw * dev,short chan)62 static void max2820_write_phy_antenna(struct ieee80211_hw *dev, short chan)
63 {
64 struct rtl8180_priv *priv = dev->priv;
65 u8 ant;
66
67 ant = MAXIM_ANTENNA;
68 if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
69 ant |= BB_ANTENNA_B;
70 if (chan == 14)
71 ant |= BB_ANTATTEN_CHAN14;
72
73 rtl8180_write_phy(dev, 0x10, ant);
74 }
75
max2820_rf_calc_rssi(u8 agc,u8 sq)76 static u8 max2820_rf_calc_rssi(u8 agc, u8 sq)
77 {
78 bool odd;
79
80 odd = !!(agc & 1);
81
82 agc >>= 1;
83 if (odd)
84 agc += 76;
85 else
86 agc += 66;
87
88 /* TODO: change addends above to avoid mult / div below */
89 return 65 * agc / 100;
90 }
91
max2820_rf_set_channel(struct ieee80211_hw * dev,struct ieee80211_conf * conf)92 static void max2820_rf_set_channel(struct ieee80211_hw *dev,
93 struct ieee80211_conf *conf)
94 {
95 struct rtl8180_priv *priv = dev->priv;
96 int channel = conf ?
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];
101
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);
105
106 max2820_write_phy_antenna(dev, channel);
107 write_max2820(dev, 3, chan);
108 }
109
max2820_rf_stop(struct ieee80211_hw * dev)110 static void max2820_rf_stop(struct ieee80211_hw *dev)
111 {
112 rtl8180_write_phy(dev, 3, 0x8);
113 write_max2820(dev, 1, 0);
114 }
115
116
max2820_rf_init(struct ieee80211_hw * dev)117 static void max2820_rf_init(struct ieee80211_hw *dev)
118 {
119 struct rtl8180_priv *priv = dev->priv;
120
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 */
125
126 max2820_rf_set_channel(dev, NULL);
127
128 write_max2820(dev, 4, 0x313); /* rx register */
129
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..
133 */
134 write_max2820(dev, 5, 0x00f);
135
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 */
143
144 max2820_write_phy_antenna(dev, 1);
145
146 rtl8180_write_phy(dev, 0x11, 0x88); /* trl */
147
148 if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
149 RTL818X_CONFIG2_ANTENNA_DIV)
150 rtl8180_write_phy(dev, 0x12, 0xc7);
151 else
152 rtl8180_write_phy(dev, 0x12, 0x47);
153
154 rtl8180_write_phy(dev, 0x13, 0x9b);
155
156 rtl8180_write_phy(dev, 0x19, 0x0); /* CHESTLIM */
157 rtl8180_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM */
158
159 max2820_rf_set_channel(dev, NULL);
160 }
161
162 const struct rtl818x_rf_ops max2820_rf_ops = {
163 .name = "Maxim",
164 .init = max2820_rf_init,
165 .stop = max2820_rf_stop,
166 .set_chan = max2820_rf_set_channel,
167 .calc_rssi = max2820_rf_calc_rssi,
168 };
169
