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sa2400.c
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1 
2 /*
3  * Radio tuning for Philips SA2400 on RTL8180
4  *
5  * Copyright 2007 Andrea Merello <[email protected]>
6  *
7  * Code from the BSD driver and the rtl8181 project have been
8  * very useful to understand certain things
9  *
10  * I want to thanks the Authors of such projects and the Ndiswrapper
11  * project Authors.
12  *
13  * A special Big Thanks also is for all people who donated me cards,
14  * making possible the creation of the original rtl8180 driver
15  * from which this code is derived!
16  *
17  * This program is free software; you can redistribute it and/or modify
18  * it under the terms of the GNU General Public License version 2 as
19  * published by the Free Software Foundation.
20  */
21 
22 #include <linux/init.h>
23 #include <linux/pci.h>
24 #include <linux/delay.h>
25 #include <net/mac80211.h>
26 
27 #include "rtl8180.h"
28 #include "sa2400.h"
29 
30 static const u32 sa2400_chan[] = {
31  0x00096c, /* ch1 */
32  0x080970,
33  0x100974,
34  0x180978,
35  0x000980,
36  0x080984,
37  0x100988,
38  0x18098c,
39  0x000994,
40  0x080998,
41  0x10099c,
42  0x1809a0,
43  0x0009a8,
44  0x0009b4, /* ch 14 */
45 };
46 
47 static void write_sa2400(struct ieee80211_hw *dev, u8 addr, u32 data)
48 {
49  struct rtl8180_priv *priv = dev->priv;
50  u32 phy_config;
51 
52  /* MAC will bang bits to the sa2400. sw 3-wire is NOT used */
53  phy_config = 0xb0000000;
54 
55  phy_config |= ((u32)(addr & 0xf)) << 24;
56  phy_config |= data & 0xffffff;
57 
58  rtl818x_iowrite32(priv,
59  (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
60 
61  msleep(3);
62 }
63 
64 static void sa2400_write_phy_antenna(struct ieee80211_hw *dev, short chan)
65 {
66  struct rtl8180_priv *priv = dev->priv;
67  u8 ant = SA2400_ANTENNA;
68 
69  if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
70  ant |= BB_ANTENNA_B;
71 
72  if (chan == 14)
73  ant |= BB_ANTATTEN_CHAN14;
74 
75  rtl8180_write_phy(dev, 0x10, ant);
76 
77 }
78 
79 static u8 sa2400_rf_rssi_map[] = {
80  0x64, 0x64, 0x63, 0x62, 0x61, 0x60, 0x5f, 0x5e,
81  0x5d, 0x5c, 0x5b, 0x5a, 0x57, 0x54, 0x52, 0x50,
82  0x4e, 0x4c, 0x4a, 0x48, 0x46, 0x44, 0x41, 0x3f,
83  0x3c, 0x3a, 0x37, 0x36, 0x36, 0x1c, 0x1c, 0x1b,
84  0x1b, 0x1a, 0x1a, 0x19, 0x19, 0x18, 0x18, 0x17,
85  0x17, 0x16, 0x16, 0x15, 0x15, 0x14, 0x14, 0x13,
86  0x13, 0x12, 0x12, 0x11, 0x11, 0x10, 0x10, 0x0f,
87  0x0f, 0x0e, 0x0e, 0x0d, 0x0d, 0x0c, 0x0c, 0x0b,
88  0x0b, 0x0a, 0x0a, 0x09, 0x09, 0x08, 0x08, 0x07,
89  0x07, 0x06, 0x06, 0x05, 0x04, 0x03, 0x02,
90 };
91 
92 static u8 sa2400_rf_calc_rssi(u8 agc, u8 sq)
93 {
94  if (sq == 0x80)
95  return 1;
96 
97  if (sq > 78)
98  return 32;
99 
100  /* TODO: recalc sa2400_rf_rssi_map to avoid mult / div */
101  return 65 * sa2400_rf_rssi_map[sq] / 100;
102 }
103 
104 static void sa2400_rf_set_channel(struct ieee80211_hw *dev,
105  struct ieee80211_conf *conf)
106 {
107  struct rtl8180_priv *priv = dev->priv;
108  int channel = ieee80211_frequency_to_channel(conf->channel->center_freq);
109  u32 txpw = priv->channels[channel - 1].hw_value & 0xFF;
110  u32 chan = sa2400_chan[channel - 1];
111 
112  write_sa2400(dev, 7, txpw);
113 
114  sa2400_write_phy_antenna(dev, channel);
115 
116  write_sa2400(dev, 0, chan);
117  write_sa2400(dev, 1, 0xbb50);
118  write_sa2400(dev, 2, 0x80);
119  write_sa2400(dev, 3, 0);
120 }
121 
122 static void sa2400_rf_stop(struct ieee80211_hw *dev)
123 {
124  write_sa2400(dev, 4, 0);
125 }
126 
127 static void sa2400_rf_init(struct ieee80211_hw *dev)
128 {
129  struct rtl8180_priv *priv = dev->priv;
130  u32 anaparam, txconf;
131  u8 firdac;
132  int analogphy = priv->rfparam & RF_PARAM_ANALOGPHY;
133 
134  anaparam = priv->anaparam;
135  anaparam &= ~(1 << ANAPARAM_TXDACOFF_SHIFT);
136  anaparam &= ~ANAPARAM_PWR1_MASK;
137  anaparam &= ~ANAPARAM_PWR0_MASK;
138 
139  if (analogphy) {
141  firdac = 0;
142  } else {
145  firdac = 1 << SA2400_REG4_FIRDAC_SHIFT;
146  }
147 
148  rtl8180_set_anaparam(priv, anaparam);
149 
150  write_sa2400(dev, 0, sa2400_chan[0]);
151  write_sa2400(dev, 1, 0xbb50);
152  write_sa2400(dev, 2, 0x80);
153  write_sa2400(dev, 3, 0);
154  write_sa2400(dev, 4, 0x19340 | firdac);
155  write_sa2400(dev, 5, 0x1dfb | (SA2400_MAX_SENS - 54) << 15);
156  write_sa2400(dev, 4, 0x19348 | firdac); /* calibrate VCO */
157 
158  if (!analogphy)
159  write_sa2400(dev, 4, 0x1938c); /*???*/
160 
161  write_sa2400(dev, 4, 0x19340 | firdac);
162 
163  write_sa2400(dev, 0, sa2400_chan[0]);
164  write_sa2400(dev, 1, 0xbb50);
165  write_sa2400(dev, 2, 0x80);
166  write_sa2400(dev, 3, 0);
167  write_sa2400(dev, 4, 0x19344 | firdac); /* calibrate filter */
168 
169  /* new from rtl8180 embedded driver (rtl8181 project) */
170  write_sa2400(dev, 6, 0x13ff | (1 << 23)); /* MANRX */
171  write_sa2400(dev, 8, 0); /* VCO */
172 
173  if (analogphy) {
174  rtl8180_set_anaparam(priv, anaparam |
175  (1 << ANAPARAM_TXDACOFF_SHIFT));
176 
177  txconf = rtl818x_ioread32(priv, &priv->map->TX_CONF);
178  rtl818x_iowrite32(priv, &priv->map->TX_CONF,
180 
181  write_sa2400(dev, 4, 0x19341); /* calibrates DC */
182 
183  /* a 5us sleep is required here,
184  * we rely on the 3ms delay introduced in write_sa2400 */
185  write_sa2400(dev, 4, 0x19345);
186 
187  /* a 20us sleep is required here,
188  * we rely on the 3ms delay introduced in write_sa2400 */
189 
190  rtl818x_iowrite32(priv, &priv->map->TX_CONF, txconf);
191 
192  rtl8180_set_anaparam(priv, anaparam);
193  }
194  /* end new code */
195 
196  write_sa2400(dev, 4, 0x19341 | firdac); /* RTX MODE */
197 
198  /* baseband configuration */
199  rtl8180_write_phy(dev, 0, 0x98);
200  rtl8180_write_phy(dev, 3, 0x38);
201  rtl8180_write_phy(dev, 4, 0xe0);
202  rtl8180_write_phy(dev, 5, 0x90);
203  rtl8180_write_phy(dev, 6, 0x1a);
204  rtl8180_write_phy(dev, 7, 0x64);
205 
206  sa2400_write_phy_antenna(dev, 1);
207 
208  rtl8180_write_phy(dev, 0x11, 0x80);
209 
210  if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
212  rtl8180_write_phy(dev, 0x12, 0xc7); /* enable ant diversity */
213  else
214  rtl8180_write_phy(dev, 0x12, 0x47); /* disable ant diversity */
215 
216  rtl8180_write_phy(dev, 0x13, 0x90 | priv->csthreshold);
217 
218  rtl8180_write_phy(dev, 0x19, 0x0);
219  rtl8180_write_phy(dev, 0x1a, 0xa0);
220 }
221 
223  .name = "Philips",
224  .init = sa2400_rf_init,
225  .stop = sa2400_rf_stop,
226  .set_chan = sa2400_rf_set_channel,
227  .calc_rssi = sa2400_rf_calc_rssi,
228 };