1 // SPDX-License-Identifier: GPL-2.0-only
2
3 /*
4 * Radio tuning for GCT GRF5101 on RTL8180
5 *
6 * Copyright 2007 Andrea Merello <andrea.merello@gmail.com>
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
19 #include <linux/pci.h>
20 #include <linux/delay.h>
21 #include <net/mac80211.h>
22
23 #include "rtl8180.h"
24 #include "grf5101.h"
25
26 static const int grf5101_encode[] = {
27 0x0, 0x8, 0x4, 0xC,
28 0x2, 0xA, 0x6, 0xE,
29 0x1, 0x9, 0x5, 0xD,
30 0x3, 0xB, 0x7, 0xF
31 };
32
write_grf5101(struct ieee80211_hw * dev,u8 addr,u32 data)33 static void write_grf5101(struct ieee80211_hw *dev, u8 addr, u32 data)
34 {
35 struct rtl8180_priv *priv = dev->priv;
36 u32 phy_config;
37
38 phy_config = grf5101_encode[(data >> 8) & 0xF];
39 phy_config |= grf5101_encode[(data >> 4) & 0xF] << 4;
40 phy_config |= grf5101_encode[data & 0xF] << 8;
41 phy_config |= grf5101_encode[(addr >> 1) & 0xF] << 12;
42 phy_config |= (addr & 1) << 16;
43 phy_config |= grf5101_encode[(data & 0xf000) >> 12] << 24;
44
45 /* MAC will bang bits to the chip */
46 phy_config |= 0x90000000;
47
48 rtl818x_iowrite32(priv,
49 (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
50
51 msleep(3);
52 }
53
grf5101_write_phy_antenna(struct ieee80211_hw * dev,short chan)54 static void grf5101_write_phy_antenna(struct ieee80211_hw *dev, short chan)
55 {
56 struct rtl8180_priv *priv = dev->priv;
57 u8 ant = GRF5101_ANTENNA;
58
59 if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
60 ant |= BB_ANTENNA_B;
61
62 if (chan == 14)
63 ant |= BB_ANTATTEN_CHAN14;
64
65 rtl8180_write_phy(dev, 0x10, ant);
66 }
67
grf5101_rf_calc_rssi(u8 agc,u8 sq)68 static u8 grf5101_rf_calc_rssi(u8 agc, u8 sq)
69 {
70 if (agc > 60)
71 return 65;
72
73 /* TODO(?): just return agc (or agc + 5) to avoid mult / div */
74 return 65 * agc / 60;
75 }
76
grf5101_rf_set_channel(struct ieee80211_hw * dev,struct ieee80211_conf * conf)77 static void grf5101_rf_set_channel(struct ieee80211_hw *dev,
78 struct ieee80211_conf *conf)
79 {
80 struct rtl8180_priv *priv = dev->priv;
81 int channel =
82 ieee80211_frequency_to_channel(conf->chandef.chan->center_freq);
83 u32 txpw = priv->channels[channel - 1].hw_value & 0xFF;
84 u32 chan = channel - 1;
85
86 /* set TX power */
87 write_grf5101(dev, 0x15, 0x0);
88 write_grf5101(dev, 0x06, txpw);
89 write_grf5101(dev, 0x15, 0x10);
90 write_grf5101(dev, 0x15, 0x0);
91
92 /* set frequency */
93 write_grf5101(dev, 0x07, 0x0);
94 write_grf5101(dev, 0x0B, chan);
95 write_grf5101(dev, 0x07, 0x1000);
96
97 grf5101_write_phy_antenna(dev, channel);
98 }
99
grf5101_rf_stop(struct ieee80211_hw * dev)100 static void grf5101_rf_stop(struct ieee80211_hw *dev)
101 {
102 struct rtl8180_priv *priv = dev->priv;
103 u32 anaparam;
104
105 anaparam = priv->anaparam;
106 anaparam &= 0x000fffff;
107 anaparam |= 0x3f900000;
108 rtl8180_set_anaparam(priv, anaparam);
109
110 write_grf5101(dev, 0x07, 0x0);
111 write_grf5101(dev, 0x1f, 0x45);
112 write_grf5101(dev, 0x1f, 0x5);
113 write_grf5101(dev, 0x00, 0x8e4);
114 }
115
grf5101_rf_init(struct ieee80211_hw * dev)116 static void grf5101_rf_init(struct ieee80211_hw *dev)
117 {
118 struct rtl8180_priv *priv = dev->priv;
119
120 rtl8180_set_anaparam(priv, priv->anaparam);
121
122 write_grf5101(dev, 0x1f, 0x0);
123 write_grf5101(dev, 0x1f, 0x0);
124 write_grf5101(dev, 0x1f, 0x40);
125 write_grf5101(dev, 0x1f, 0x60);
126 write_grf5101(dev, 0x1f, 0x61);
127 write_grf5101(dev, 0x1f, 0x61);
128 write_grf5101(dev, 0x00, 0xae4);
129 write_grf5101(dev, 0x1f, 0x1);
130 write_grf5101(dev, 0x1f, 0x41);
131 write_grf5101(dev, 0x1f, 0x61);
132
133 write_grf5101(dev, 0x01, 0x1a23);
134 write_grf5101(dev, 0x02, 0x4971);
135 write_grf5101(dev, 0x03, 0x41de);
136 write_grf5101(dev, 0x04, 0x2d80);
137 write_grf5101(dev, 0x05, 0x68ff); /* 0x61ff original value */
138 write_grf5101(dev, 0x06, 0x0);
139 write_grf5101(dev, 0x07, 0x0);
140 write_grf5101(dev, 0x08, 0x7533);
141 write_grf5101(dev, 0x09, 0xc401);
142 write_grf5101(dev, 0x0a, 0x0);
143 write_grf5101(dev, 0x0c, 0x1c7);
144 write_grf5101(dev, 0x0d, 0x29d3);
145 write_grf5101(dev, 0x0e, 0x2e8);
146 write_grf5101(dev, 0x10, 0x192);
147 write_grf5101(dev, 0x11, 0x248);
148 write_grf5101(dev, 0x12, 0x0);
149 write_grf5101(dev, 0x13, 0x20c4);
150 write_grf5101(dev, 0x14, 0xf4fc);
151 write_grf5101(dev, 0x15, 0x0);
152 write_grf5101(dev, 0x16, 0x1500);
153
154 write_grf5101(dev, 0x07, 0x1000);
155
156 /* baseband configuration */
157 rtl8180_write_phy(dev, 0, 0xa8);
158 rtl8180_write_phy(dev, 3, 0x0);
159 rtl8180_write_phy(dev, 4, 0xc0);
160 rtl8180_write_phy(dev, 5, 0x90);
161 rtl8180_write_phy(dev, 6, 0x1e);
162 rtl8180_write_phy(dev, 7, 0x64);
163
164 grf5101_write_phy_antenna(dev, 1);
165
166 rtl8180_write_phy(dev, 0x11, 0x88);
167
168 if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
169 RTL818X_CONFIG2_ANTENNA_DIV)
170 rtl8180_write_phy(dev, 0x12, 0xc0); /* enable ant diversity */
171 else
172 rtl8180_write_phy(dev, 0x12, 0x40); /* disable ant diversity */
173
174 rtl8180_write_phy(dev, 0x13, 0x90 | priv->csthreshold);
175
176 rtl8180_write_phy(dev, 0x19, 0x0);
177 rtl8180_write_phy(dev, 0x1a, 0xa0);
178 rtl8180_write_phy(dev, 0x1b, 0x44);
179 }
180
181 const struct rtl818x_rf_ops grf5101_rf_ops = {
182 .name = "GCT",
183 .init = grf5101_rf_init,
184 .stop = grf5101_rf_stop,
185 .set_chan = grf5101_rf_set_channel,
186 .calc_rssi = grf5101_rf_calc_rssi,
187 };
188