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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Radio tuning for Maxim max2820 on RTL81804 *5 * Copyright 2007 Andrea Merello <andrea.merello@gmail.com>6 *7 * Code from the BSD driver and the rtl8181 project have been8 * very useful to understand certain things9 *10 * I want to thanks the Authors of such projects and the Ndiswrapper11 * 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 driver15 * from which this code is derived!16 */17 18#include <linux/pci.h>19#include <linux/delay.h>20#include <net/mac80211.h>21 22#include "rtl8180.h"23#include "max2820.h"24 25static const u32 max2820_chan[] = {26 12, /* CH 1 */27 17,28 22,29 27,30 32,31 37,32 42,33 47,34 52,35 57,36 62,37 67,38 72,39 84, /* CH 14 */40};41 42static void write_max2820(struct ieee80211_hw *dev, u8 addr, u32 data)43{44 struct rtl8180_priv *priv = dev->priv;45 u32 phy_config;46 47 phy_config = 0x90 + (data & 0xf);48 phy_config <<= 16;49 phy_config += addr;50 phy_config <<= 8;51 phy_config += (data >> 4) & 0xff;52 53 rtl818x_iowrite32(priv,54 (__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);55 56 msleep(1);57}58 59static void max2820_write_phy_antenna(struct ieee80211_hw *dev, short chan)60{61 struct rtl8180_priv *priv = dev->priv;62 u8 ant;63 64 ant = MAXIM_ANTENNA;65 if (priv->rfparam & RF_PARAM_ANTBDEFAULT)66 ant |= BB_ANTENNA_B;67 if (chan == 14)68 ant |= BB_ANTATTEN_CHAN14;69 70 rtl8180_write_phy(dev, 0x10, ant);71}72 73static u8 max2820_rf_calc_rssi(u8 agc, u8 sq)74{75 bool odd;76 77 odd = !!(agc & 1);78 79 agc >>= 1;80 if (odd)81 agc += 76;82 else83 agc += 66;84 85 /* TODO: change addends above to avoid mult / div below */86 return 65 * agc / 100;87}88 89static void max2820_rf_set_channel(struct ieee80211_hw *dev,90 struct ieee80211_conf *conf)91{92 struct rtl8180_priv *priv = dev->priv;93 int channel = conf ?94 ieee80211_frequency_to_channel(conf->chandef.chan->center_freq) : 1;95 unsigned int chan_idx = channel - 1;96 u32 txpw = priv->channels[chan_idx].hw_value & 0xFF;97 u32 chan = max2820_chan[chan_idx];98 99 /* While philips SA2400 drive the PA bias from100 * sa2400, for MAXIM we do this directly from BB */101 rtl8180_write_phy(dev, 3, txpw);102 103 max2820_write_phy_antenna(dev, channel);104 write_max2820(dev, 3, chan);105}106 107static void max2820_rf_stop(struct ieee80211_hw *dev)108{109 rtl8180_write_phy(dev, 3, 0x8);110 write_max2820(dev, 1, 0);111}112 113 114static void max2820_rf_init(struct ieee80211_hw *dev)115{116 struct rtl8180_priv *priv = dev->priv;117 118 /* MAXIM from netbsd driver */119 write_max2820(dev, 0, 0x007); /* test mode as indicated in datasheet */120 write_max2820(dev, 1, 0x01e); /* enable register */121 write_max2820(dev, 2, 0x001); /* synt register */122 123 max2820_rf_set_channel(dev, NULL);124 125 write_max2820(dev, 4, 0x313); /* rx register */126 127 /* PA is driven directly by the BB, we keep the MAXIM bias128 * at the highest value in case that setting it to lower129 * values may introduce some further attenuation somewhere..130 */131 write_max2820(dev, 5, 0x00f);132 133 /* baseband configuration */134 rtl8180_write_phy(dev, 0, 0x88); /* sys1 */135 rtl8180_write_phy(dev, 3, 0x08); /* txagc */136 rtl8180_write_phy(dev, 4, 0xf8); /* lnadet */137 rtl8180_write_phy(dev, 5, 0x90); /* ifagcinit */138 rtl8180_write_phy(dev, 6, 0x1a); /* ifagclimit */139 rtl8180_write_phy(dev, 7, 0x64); /* ifagcdet */140 141 max2820_write_phy_antenna(dev, 1);142 143 rtl8180_write_phy(dev, 0x11, 0x88); /* trl */144 145 if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &146 RTL818X_CONFIG2_ANTENNA_DIV)147 rtl8180_write_phy(dev, 0x12, 0xc7);148 else149 rtl8180_write_phy(dev, 0x12, 0x47);150 151 rtl8180_write_phy(dev, 0x13, 0x9b);152 153 rtl8180_write_phy(dev, 0x19, 0x0); /* CHESTLIM */154 rtl8180_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM */155 156 max2820_rf_set_channel(dev, NULL);157}158 159const struct rtl818x_rf_ops max2820_rf_ops = {160 .name = "Maxim",161 .init = max2820_rf_init,162 .stop = max2820_rf_stop,163 .set_chan = max2820_rf_set_channel,164 .calc_rssi = max2820_rf_calc_rssi,165};166