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// SPDX-License-Identifier: GPL-2.0-only
/*
* Radio tuning for Maxim max2820 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 "max2820.h"
static const u32 max2820_chan[] = {
12, /* CH 1 */
17,
22,
27,
32,
37,
42,
47,
52,
57,
62,
67,
72,
84, /* CH 14 */
};
static void write_max2820(struct ieee80211_hw *dev, u8 addr, u32 data)
{
struct rtl8180_priv *priv = dev->priv;
u32 phy_config;
phy_config = 0x90 + (data & 0xf);
phy_config <<= 16;
phy_config += addr;
phy_config <<= 8;
phy_config += (data >> 4) & 0xff;
rtl818x_iowrite32(priv,
(__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
msleep(1);
}
static void max2820_write_phy_antenna(struct ieee80211_hw *dev, short chan)
{
struct rtl8180_priv *priv = dev->priv;
u8 ant;
ant = MAXIM_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 max2820_rf_calc_rssi(u8 agc, u8 sq)
{
bool odd;
odd = !!(agc & 1);
agc >>= 1;
if (odd)
agc += 76;
else
agc += 66;
/* TODO: change addends above to avoid mult / div below */
return 65 * agc / 100;
}
static void max2820_rf_set_channel(struct ieee80211_hw *dev,
struct ieee80211_conf *conf)
{
struct rtl8180_priv *priv = dev->priv;
int channel = conf ?
ieee80211_frequency_to_channel(conf->chandef.chan->center_freq) : 1;
unsigned int chan_idx = channel - 1;
u32 txpw = priv->channels[chan_idx].hw_value & 0xFF;
u32 chan = max2820_chan[chan_idx];
/* While philips SA2400 drive the PA bias from
* sa2400, for MAXIM we do this directly from BB */
rtl8180_write_phy(dev, 3, txpw);
max2820_write_phy_antenna(dev, channel);
write_max2820(dev, 3, chan);
}
static void max2820_rf_stop(struct ieee80211_hw *dev)
{
rtl8180_write_phy(dev, 3, 0x8);
write_max2820(dev, 1, 0);
}
static void max2820_rf_init(struct ieee80211_hw *dev)
{
struct rtl8180_priv *priv = dev->priv;
/* MAXIM from netbsd driver */
write_max2820(dev, 0, 0x007); /* test mode as indicated in datasheet */
write_max2820(dev, 1, 0x01e); /* enable register */
write_max2820(dev, 2, 0x001); /* synt register */
max2820_rf_set_channel(dev, NULL);
write_max2820(dev, 4, 0x313); /* rx register */
/* PA is driven directly by the BB, we keep the MAXIM bias
* at the highest value in case that setting it to lower
* values may introduce some further attenuation somewhere..
*/
write_max2820(dev, 5, 0x00f);
/* baseband configuration */
rtl8180_write_phy(dev, 0, 0x88); /* sys1 */
rtl8180_write_phy(dev, 3, 0x08); /* txagc */
rtl8180_write_phy(dev, 4, 0xf8); /* lnadet */
rtl8180_write_phy(dev, 5, 0x90); /* ifagcinit */
rtl8180_write_phy(dev, 6, 0x1a); /* ifagclimit */
rtl8180_write_phy(dev, 7, 0x64); /* ifagcdet */
max2820_write_phy_antenna(dev, 1);
rtl8180_write_phy(dev, 0x11, 0x88); /* trl */
if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
RTL818X_CONFIG2_ANTENNA_DIV)
rtl8180_write_phy(dev, 0x12, 0xc7);
else
rtl8180_write_phy(dev, 0x12, 0x47);
rtl8180_write_phy(dev, 0x13, 0x9b);
rtl8180_write_phy(dev, 0x19, 0x0); /* CHESTLIM */
rtl8180_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM */
max2820_rf_set_channel(dev, NULL);
}
const struct rtl818x_rf_ops max2820_rf_ops = {
.name = "Maxim",
.init = max2820_rf_init,
.stop = max2820_rf_stop,
.set_chan = max2820_rf_set_channel,
.calc_rssi = max2820_rf_calc_rssi,
};
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