cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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max2820.c (3938B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Radio tuning for Maxim max2820 on RTL8180
      4 *
      5 * Copyright 2007 Andrea Merello <andrea.merello@gmail.com>
      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
     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	else
     83		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 from
    100	 * 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 bias
    128	 * at the highest value in case that setting it to lower
    129	 * 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	else
    149		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};