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