aboutsummaryrefslogtreecommitdiffstats
path: root/gpxe/src/drivers/net/rtl818x/rtl8180_max2820.c
blob: 7c9495f9371726b84ceb2ec1540e3d416a1a965d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
/*
 * Radio tuning for Maxim max2820 on RTL8180
 *
 * Copyright 2007 Andrea Merello <andreamrl@tiscali.it>
 *
 * Modified slightly for gPXE, June 2009 by Joshua Oreman.
 *
 * Code from the BSD driver and the rtl8181 project have been
 * very useful to understand certain things
 *
 * I want to thanks the Authors of such projects and the Ndiswrapper
 * project Authors.
 *
 * A special Big Thanks also is for all people who donated me cards,
 * making possible the creation of the original rtl8180 driver
 * from which this code is derived!
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <unistd.h>
#include <gpxe/pci.h>
#include <gpxe/net80211.h>

#include "rtl818x.h"

FILE_LICENCE(GPL2_ONLY);

#define MAXIM_ANTENNA 0xb3

static const u32 max2820_chan[] = {
	12, /* CH 1 */
	17,
	22,
	27,
	32,
	37,
	42,
	47,
	52,
	57,
	62,
	67,
	72,
	84, /* CH 14 */
};

static void write_max2820(struct net80211_device *dev, u8 addr, u32 data)
{
	struct rtl818x_priv *priv = dev->priv;
	u32 phy_config;

	phy_config = 0x90 + (data & 0xf);
	phy_config <<= 16;
	phy_config += addr;
	phy_config <<= 8;
	phy_config += (data >> 4) & 0xff;

	/* This was originally a 32-bit write to a typecast
	   RFPinsOutput, but gcc complained about aliasing rules. -JBO */
	rtl818x_iowrite16(priv, &priv->map->RFPinsOutput, phy_config & 0xffff);
	rtl818x_iowrite16(priv, &priv->map->RFPinsEnable, phy_config >> 16);

	mdelay(1);
}

static void max2820_write_phy_antenna(struct net80211_device *dev, short chan)
{
	struct rtl818x_priv *priv = dev->priv;
	u8 ant;

	ant = MAXIM_ANTENNA;
	if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
		ant |= BB_ANTENNA_B;
	if (chan == 14)
		ant |= BB_ANTATTEN_CHAN14;

	rtl818x_write_phy(dev, 0x10, ant);
}

static void max2820_rf_set_channel(struct net80211_device *dev,
				   struct net80211_channel *channelp)
{
	struct rtl818x_priv *priv = dev->priv;
	int channel = channelp->channel_nr;
	unsigned int chan_idx = channel - 1;
	u32 txpw = priv->txpower[chan_idx] & 0xFF;
	u32 chan = max2820_chan[chan_idx];

	/* While philips SA2400 drive the PA bias from
	 * sa2400, for MAXIM we do this directly from BB */
	rtl818x_write_phy(dev, 3, txpw);

	max2820_write_phy_antenna(dev, channel);
	write_max2820(dev, 3, chan);
}

static void max2820_rf_stop(struct net80211_device *dev)
{
	rtl818x_write_phy(dev, 3, 0x8);
	write_max2820(dev, 1, 0);
}


static void max2820_rf_init(struct net80211_device *dev)
{
	struct rtl818x_priv *priv = dev->priv;

	/* MAXIM from netbsd driver */
	write_max2820(dev, 0, 0x007); /* test mode as indicated in datasheet */
	write_max2820(dev, 1, 0x01e); /* enable register */
	write_max2820(dev, 2, 0x001); /* synt register */

	max2820_rf_set_channel(dev, NULL);

	write_max2820(dev, 4, 0x313); /* rx register */

	/* PA is driven directly by the BB, we keep the MAXIM bias
	 * at the highest value in case that setting it to lower
	 * values may introduce some further attenuation somewhere..
	 */
	write_max2820(dev, 5, 0x00f);

	/* baseband configuration */
	rtl818x_write_phy(dev, 0, 0x88); /* sys1       */
	rtl818x_write_phy(dev, 3, 0x08); /* txagc      */
	rtl818x_write_phy(dev, 4, 0xf8); /* lnadet     */
	rtl818x_write_phy(dev, 5, 0x90); /* ifagcinit  */
	rtl818x_write_phy(dev, 6, 0x1a); /* ifagclimit */
	rtl818x_write_phy(dev, 7, 0x64); /* ifagcdet   */

	max2820_write_phy_antenna(dev, 1);

	rtl818x_write_phy(dev, 0x11, 0x88); /* trl */

	if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
	    RTL818X_CONFIG2_ANTENNA_DIV)
		rtl818x_write_phy(dev, 0x12, 0xc7);
	else
		rtl818x_write_phy(dev, 0x12, 0x47);

	rtl818x_write_phy(dev, 0x13, 0x9b);

	rtl818x_write_phy(dev, 0x19, 0x0);  /* CHESTLIM */
	rtl818x_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM  */

	max2820_rf_set_channel(dev, NULL);
}

struct rtl818x_rf_ops max2820_rf_ops __rtl818x_rf_driver = {
	.name		= "Maxim max2820",
	.id		= 4,
	.init		= max2820_rf_init,
	.stop		= max2820_rf_stop,
	.set_chan	= max2820_rf_set_channel
};