grf5101.c

  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
 26static 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
 33static 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
 54static 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
 68static 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
 77static 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
100static 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
116static 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
181const 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};