Quelle  grf5101.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only

/*
 * Radio tuning for GCT GRF5101 on RTL8180
 *
 * Copyright 2007 Andrea Merello <andrea.merello@gmail.com>
 *
 * 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!
 */

#include <linux/pci.h>
#include <linux/delay.h>
#include <net/mac80211.h>

#include "rtl8180.h"
#include "grf5101.h"

static const int grf5101_encode[] = {
 0x0, 0x8, 0x4, 0xC,
 0x2, 0xA, 0x6, 0xE,
 0x1, 0x9, 0x5, 0xD,
 0x3, 0xB, 0x7, 0xF
};

static void write_grf5101(struct ieee80211_hw *dev, u8 addr, u32 data)
{
 struct rtl8180_priv *priv = dev->priv;
 u32 phy_config;

 phy_config =  grf5101_encode[(data >> 8) & 0xF];
 phy_config |= grf5101_encode[(data >> 4) & 0xF] << 4;
 phy_config |= grf5101_encode[data & 0xF] << 8;
 phy_config |= grf5101_encode[(addr >> 1) & 0xF] << 12;
 phy_config |= (addr & 1) << 16;
 phy_config |= grf5101_encode[(data & 0xf000) >> 12] << 24;

 /* MAC will bang bits to the chip */
 phy_config |= 0x90000000;

 rtl818x_iowrite32(priv,
  (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);

 msleep(3);
}

static void grf5101_write_phy_antenna(struct ieee80211_hw *dev, short chan)
{
 struct rtl8180_priv *priv = dev->priv;
 u8 ant = GRF5101_ANTENNA;

 if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
  ant |= BB_ANTENNA_B;

 if (chan == 14)
  ant |= BB_ANTATTEN_CHAN14;

 rtl8180_write_phy(dev, 0x10, ant);
}

static u8 grf5101_rf_calc_rssi(u8 agc, u8 sq)
{
 if (agc > 60)
  return 65;

 /* TODO(?): just return agc (or agc + 5) to avoid mult / div */
 return 65 * agc / 60;
}

static void grf5101_rf_set_channel(struct ieee80211_hw *dev,
       struct ieee80211_conf *conf)
{
 struct rtl8180_priv *priv = dev->priv;
 int channel =
  ieee80211_frequency_to_channel(conf->chandef.chan->center_freq);
 u32 txpw = priv->channels[channel - 1].hw_value & 0xFF;
 u32 chan = channel - 1;

 /* set TX power */
 write_grf5101(dev, 0x15, 0x0);
 write_grf5101(dev, 0x06, txpw);
 write_grf5101(dev, 0x15, 0x10);
 write_grf5101(dev, 0x15, 0x0);

 /* set frequency */
 write_grf5101(dev, 0x07, 0x0);
 write_grf5101(dev, 0x0B, chan);
 write_grf5101(dev, 0x07, 0x1000);

 grf5101_write_phy_antenna(dev, channel);
}

static void grf5101_rf_stop(struct ieee80211_hw *dev)
{
 struct rtl8180_priv *priv = dev->priv;
 u32 anaparam;

 anaparam = priv->anaparam;
 anaparam &= 0x000fffff;
 anaparam |= 0x3f900000;
 rtl8180_set_anaparam(priv, anaparam);

 write_grf5101(dev, 0x07, 0x0);
 write_grf5101(dev, 0x1f, 0x45);
 write_grf5101(dev, 0x1f, 0x5);
 write_grf5101(dev, 0x00, 0x8e4);
}

static void grf5101_rf_init(struct ieee80211_hw *dev)
{
 struct rtl8180_priv *priv = dev->priv;

 rtl8180_set_anaparam(priv, priv->anaparam);

 write_grf5101(dev, 0x1f, 0x0);
 write_grf5101(dev, 0x1f, 0x0);
 write_grf5101(dev, 0x1f, 0x40);
 write_grf5101(dev, 0x1f, 0x60);
 write_grf5101(dev, 0x1f, 0x61);
 write_grf5101(dev, 0x1f, 0x61);
 write_grf5101(dev, 0x00, 0xae4);
 write_grf5101(dev, 0x1f, 0x1);
 write_grf5101(dev, 0x1f, 0x41);
 write_grf5101(dev, 0x1f, 0x61);

 write_grf5101(dev, 0x01, 0x1a23);
 write_grf5101(dev, 0x02, 0x4971);
 write_grf5101(dev, 0x03, 0x41de);
 write_grf5101(dev, 0x04, 0x2d80);
 write_grf5101(dev, 0x05, 0x68ff); /* 0x61ff original value */
 write_grf5101(dev, 0x06, 0x0);
 write_grf5101(dev, 0x07, 0x0);
 write_grf5101(dev, 0x08, 0x7533);
 write_grf5101(dev, 0x09, 0xc401);
 write_grf5101(dev, 0x0a, 0x0);
 write_grf5101(dev, 0x0c, 0x1c7);
 write_grf5101(dev, 0x0d, 0x29d3);
 write_grf5101(dev, 0x0e, 0x2e8);
 write_grf5101(dev, 0x10, 0x192);
 write_grf5101(dev, 0x11, 0x248);
 write_grf5101(dev, 0x12, 0x0);
 write_grf5101(dev, 0x13, 0x20c4);
 write_grf5101(dev, 0x14, 0xf4fc);
 write_grf5101(dev, 0x15, 0x0);
 write_grf5101(dev, 0x16, 0x1500);

 write_grf5101(dev, 0x07, 0x1000);

 /* baseband configuration */
 rtl8180_write_phy(dev, 0, 0xa8);
 rtl8180_write_phy(dev, 3, 0x0);
 rtl8180_write_phy(dev, 4, 0xc0);
 rtl8180_write_phy(dev, 5, 0x90);
 rtl8180_write_phy(dev, 6, 0x1e);
 rtl8180_write_phy(dev, 7, 0x64);

 grf5101_write_phy_antenna(dev, 1);

 rtl8180_write_phy(dev, 0x11, 0x88);

 if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
     RTL818X_CONFIG2_ANTENNA_DIV)
  rtl8180_write_phy(dev, 0x12, 0xc0); /* enable ant diversity */
 else
  rtl8180_write_phy(dev, 0x12, 0x40); /* disable ant diversity */

 rtl8180_write_phy(dev, 0x13, 0x90 | priv->csthreshold);

 rtl8180_write_phy(dev, 0x19, 0x0);
 rtl8180_write_phy(dev, 0x1a, 0xa0);
 rtl8180_write_phy(dev, 0x1b, 0x44);
}

const struct rtl818x_rf_ops grf5101_rf_ops = {
 .name  = "GCT",
 .init  = grf5101_rf_init,
 .stop  = grf5101_rf_stop,
 .set_chan = grf5101_rf_set_channel,
 .calc_rssi = grf5101_rf_calc_rssi,
};