1 /*
2 * Radio tuning for Maxim max2820 on RTL8180
3 *
4 * Copyright 2007 Andrea Merello <andreamrl@tiscali.it>
5 *
6 * Modified slightly for iPXE, June 2009 by Joshua Oreman.
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 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License version 2 as
20 * published by the Free Software Foundation.
21 */
22
23 #include <unistd.h>
24 #include <ipxe/pci.h>
25 #include <ipxe/net80211.h>
26
27 #include "rtl818x.h"
28
29 FILE_LICENCE(GPL2_ONLY);
30
31 #define MAXIM_ANTENNA 0xb3
32
33 static const u32 max2820_chan[] = {
34 12, /* CH 1 */
35 17,
36 22,
37 27,
38 32,
39 37,
40 42,
41 47,
42 52,
43 57,
44 62,
45 67,
46 72,
47 84, /* CH 14 */
48 };
49
write_max2820(struct net80211_device * dev,u8 addr,u32 data)50 static void write_max2820(struct net80211_device *dev, u8 addr, u32 data)
51 {
52 struct rtl818x_priv *priv = dev->priv;
53 u32 phy_config;
54
55 phy_config = 0x90 + (data & 0xf);
56 phy_config <<= 16;
57 phy_config += addr;
58 phy_config <<= 8;
59 phy_config += (data >> 4) & 0xff;
60
61 /* This was originally a 32-bit write to a typecast
62 RFPinsOutput, but gcc complained about aliasing rules. -JBO */
63 rtl818x_iowrite16(priv, &priv->map->RFPinsOutput, phy_config & 0xffff);
64 rtl818x_iowrite16(priv, &priv->map->RFPinsEnable, phy_config >> 16);
65
66 mdelay(1);
67 }
68
max2820_write_phy_antenna(struct net80211_device * dev,short chan)69 static void max2820_write_phy_antenna(struct net80211_device *dev, short chan)
70 {
71 struct rtl818x_priv *priv = dev->priv;
72 u8 ant;
73
74 ant = MAXIM_ANTENNA;
75 if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
76 ant |= BB_ANTENNA_B;
77 if (chan == 14)
78 ant |= BB_ANTATTEN_CHAN14;
79
80 rtl818x_write_phy(dev, 0x10, ant);
81 }
82
max2820_rf_set_channel(struct net80211_device * dev,struct net80211_channel * channelp)83 static void max2820_rf_set_channel(struct net80211_device *dev,
84 struct net80211_channel *channelp)
85 {
86 struct rtl818x_priv *priv = dev->priv;
87 int channel = channelp->channel_nr;
88 unsigned int chan_idx = channel - 1;
89 u32 txpw = priv->txpower[chan_idx] & 0xFF;
90 u32 chan = max2820_chan[chan_idx];
91
92 /* While philips SA2400 drive the PA bias from
93 * sa2400, for MAXIM we do this directly from BB */
94 rtl818x_write_phy(dev, 3, txpw);
95
96 max2820_write_phy_antenna(dev, channel);
97 write_max2820(dev, 3, chan);
98 }
99
max2820_rf_stop(struct net80211_device * dev)100 static void max2820_rf_stop(struct net80211_device *dev)
101 {
102 rtl818x_write_phy(dev, 3, 0x8);
103 write_max2820(dev, 1, 0);
104 }
105
106
max2820_rf_init(struct net80211_device * dev)107 static void max2820_rf_init(struct net80211_device *dev)
108 {
109 struct rtl818x_priv *priv = dev->priv;
110
111 /* MAXIM from netbsd driver */
112 write_max2820(dev, 0, 0x007); /* test mode as indicated in datasheet */
113 write_max2820(dev, 1, 0x01e); /* enable register */
114 write_max2820(dev, 2, 0x001); /* synt register */
115
116 max2820_rf_set_channel(dev, NULL);
117
118 write_max2820(dev, 4, 0x313); /* rx register */
119
120 /* PA is driven directly by the BB, we keep the MAXIM bias
121 * at the highest value in case that setting it to lower
122 * values may introduce some further attenuation somewhere..
123 */
124 write_max2820(dev, 5, 0x00f);
125
126 /* baseband configuration */
127 rtl818x_write_phy(dev, 0, 0x88); /* sys1 */
128 rtl818x_write_phy(dev, 3, 0x08); /* txagc */
129 rtl818x_write_phy(dev, 4, 0xf8); /* lnadet */
130 rtl818x_write_phy(dev, 5, 0x90); /* ifagcinit */
131 rtl818x_write_phy(dev, 6, 0x1a); /* ifagclimit */
132 rtl818x_write_phy(dev, 7, 0x64); /* ifagcdet */
133
134 max2820_write_phy_antenna(dev, 1);
135
136 rtl818x_write_phy(dev, 0x11, 0x88); /* trl */
137
138 if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
139 RTL818X_CONFIG2_ANTENNA_DIV)
140 rtl818x_write_phy(dev, 0x12, 0xc7);
141 else
142 rtl818x_write_phy(dev, 0x12, 0x47);
143
144 rtl818x_write_phy(dev, 0x13, 0x9b);
145
146 rtl818x_write_phy(dev, 0x19, 0x0); /* CHESTLIM */
147 rtl818x_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM */
148
149 max2820_rf_set_channel(dev, NULL);
150 }
151
152 struct rtl818x_rf_ops max2820_rf_ops __rtl818x_rf_driver = {
153 .name = "Maxim max2820",
154 .id = 4,
155 .init = max2820_rf_init,
156 .stop = max2820_rf_stop,
157 .set_chan = max2820_rf_set_channel
158 };
159