1 /*
2 * Radio tuning for Maxim max2820 on RTL8180
3 *
4 * Copyright 2007 Andrea Merello <andreamrl@tiscali.it>
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/init.h>
22 #include <linux/pci.h>
23 #include <linux/delay.h>
24 #include <net/mac80211.h>
25
26 #include "rtl8180.h"
27 #include "max2820.h"
28
29 static const u32 max2820_chan[] = {
30 12, /* CH 1 */
31 17,
32 22,
33 27,
34 32,
35 37,
36 42,
37 47,
38 52,
39 57,
40 62,
41 67,
42 72,
43 84, /* CH 14 */
44 };
45
write_max2820(struct ieee80211_hw * dev,u8 addr,u32 data)46 static void write_max2820(struct ieee80211_hw *dev, u8 addr, u32 data)
47 {
48 struct rtl8180_priv *priv = dev->priv;
49 u32 phy_config;
50
51 phy_config = 0x90 + (data & 0xf);
52 phy_config <<= 16;
53 phy_config += addr;
54 phy_config <<= 8;
55 phy_config += (data >> 4) & 0xff;
56
57 rtl818x_iowrite32(priv,
58 (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
59
60 msleep(1);
61 }
62
max2820_write_phy_antenna(struct ieee80211_hw * dev,short chan)63 static void max2820_write_phy_antenna(struct ieee80211_hw *dev, short chan)
64 {
65 struct rtl8180_priv *priv = dev->priv;
66 u8 ant;
67
68 ant = MAXIM_ANTENNA;
69 if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
70 ant |= BB_ANTENNA_B;
71 if (chan == 14)
72 ant |= BB_ANTATTEN_CHAN14;
73
74 rtl8180_write_phy(dev, 0x10, ant);
75 }
76
max2820_rf_calc_rssi(u8 agc,u8 sq)77 static u8 max2820_rf_calc_rssi(u8 agc, u8 sq)
78 {
79 bool odd;
80
81 odd = !!(agc & 1);
82
83 agc >>= 1;
84 if (odd)
85 agc += 76;
86 else
87 agc += 66;
88
89 /* TODO: change addends above to avoid mult / div below */
90 return 65 * agc / 100;
91 }
92
max2820_rf_set_channel(struct ieee80211_hw * dev,struct ieee80211_conf * conf)93 static void max2820_rf_set_channel(struct ieee80211_hw *dev,
94 struct ieee80211_conf *conf)
95 {
96 struct rtl8180_priv *priv = dev->priv;
97 int channel = conf ?
98 ieee80211_frequency_to_channel(conf->channel->center_freq) : 1;
99 unsigned int chan_idx = channel - 1;
100 u32 txpw = priv->channels[chan_idx].hw_value & 0xFF;
101 u32 chan = max2820_chan[chan_idx];
102
103 /* While philips SA2400 drive the PA bias from
104 * sa2400, for MAXIM we do this directly from BB */
105 rtl8180_write_phy(dev, 3, txpw);
106
107 max2820_write_phy_antenna(dev, channel);
108 write_max2820(dev, 3, chan);
109 }
110
max2820_rf_stop(struct ieee80211_hw * dev)111 static void max2820_rf_stop(struct ieee80211_hw *dev)
112 {
113 rtl8180_write_phy(dev, 3, 0x8);
114 write_max2820(dev, 1, 0);
115 }
116
117
max2820_rf_init(struct ieee80211_hw * dev)118 static void max2820_rf_init(struct ieee80211_hw *dev)
119 {
120 struct rtl8180_priv *priv = dev->priv;
121
122 /* MAXIM from netbsd driver */
123 write_max2820(dev, 0, 0x007); /* test mode as indicated in datasheet */
124 write_max2820(dev, 1, 0x01e); /* enable register */
125 write_max2820(dev, 2, 0x001); /* synt register */
126
127 max2820_rf_set_channel(dev, NULL);
128
129 write_max2820(dev, 4, 0x313); /* rx register */
130
131 /* PA is driven directly by the BB, we keep the MAXIM bias
132 * at the highest value in case that setting it to lower
133 * values may introduce some further attenuation somewhere..
134 */
135 write_max2820(dev, 5, 0x00f);
136
137 /* baseband configuration */
138 rtl8180_write_phy(dev, 0, 0x88); /* sys1 */
139 rtl8180_write_phy(dev, 3, 0x08); /* txagc */
140 rtl8180_write_phy(dev, 4, 0xf8); /* lnadet */
141 rtl8180_write_phy(dev, 5, 0x90); /* ifagcinit */
142 rtl8180_write_phy(dev, 6, 0x1a); /* ifagclimit */
143 rtl8180_write_phy(dev, 7, 0x64); /* ifagcdet */
144
145 max2820_write_phy_antenna(dev, 1);
146
147 rtl8180_write_phy(dev, 0x11, 0x88); /* trl */
148
149 if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
150 RTL818X_CONFIG2_ANTENNA_DIV)
151 rtl8180_write_phy(dev, 0x12, 0xc7);
152 else
153 rtl8180_write_phy(dev, 0x12, 0x47);
154
155 rtl8180_write_phy(dev, 0x13, 0x9b);
156
157 rtl8180_write_phy(dev, 0x19, 0x0); /* CHESTLIM */
158 rtl8180_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM */
159
160 max2820_rf_set_channel(dev, NULL);
161 }
162
163 const struct rtl818x_rf_ops max2820_rf_ops = {
164 .name = "Maxim",
165 .init = max2820_rf_init,
166 .stop = max2820_rf_stop,
167 .set_chan = max2820_rf_set_channel,
168 .calc_rssi = max2820_rf_calc_rssi,
169 };
170