166 lines
3.8 KiB
C
166 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Radio tuning for Maxim max2820 on RTL8180
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*
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* Copyright 2007 Andrea Merello <andrea.merello@gmail.com>
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*
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* Code from the BSD driver and the rtl8181 project have been
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* very useful to understand certain things
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*
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* I want to thanks the Authors of such projects and the Ndiswrapper
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* project Authors.
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*
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* A special Big Thanks also is for all people who donated me cards,
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* making possible the creation of the original rtl8180 driver
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* from which this code is derived!
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*/
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#include <linux/pci.h>
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#include <linux/delay.h>
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#include <net/mac80211.h>
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#include "rtl8180.h"
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#include "max2820.h"
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static const u32 max2820_chan[] = {
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12, /* CH 1 */
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17,
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22,
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27,
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32,
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37,
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42,
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47,
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52,
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57,
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62,
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67,
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72,
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84, /* CH 14 */
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};
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static void write_max2820(struct ieee80211_hw *dev, u8 addr, u32 data)
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{
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struct rtl8180_priv *priv = dev->priv;
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u32 phy_config;
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phy_config = 0x90 + (data & 0xf);
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phy_config <<= 16;
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phy_config += addr;
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phy_config <<= 8;
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phy_config += (data >> 4) & 0xff;
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rtl818x_iowrite32(priv,
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(__le32 __iomem *) &priv->map->RFPinsOutput, phy_config);
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msleep(1);
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}
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static void max2820_write_phy_antenna(struct ieee80211_hw *dev, short chan)
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{
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struct rtl8180_priv *priv = dev->priv;
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u8 ant;
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ant = MAXIM_ANTENNA;
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if (priv->rfparam & RF_PARAM_ANTBDEFAULT)
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ant |= BB_ANTENNA_B;
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if (chan == 14)
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ant |= BB_ANTATTEN_CHAN14;
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rtl8180_write_phy(dev, 0x10, ant);
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}
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static u8 max2820_rf_calc_rssi(u8 agc, u8 sq)
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{
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bool odd;
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odd = !!(agc & 1);
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agc >>= 1;
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if (odd)
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agc += 76;
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else
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agc += 66;
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/* TODO: change addends above to avoid mult / div below */
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return 65 * agc / 100;
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}
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static void max2820_rf_set_channel(struct ieee80211_hw *dev,
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struct ieee80211_conf *conf)
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{
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struct rtl8180_priv *priv = dev->priv;
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int channel = conf ?
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ieee80211_frequency_to_channel(conf->chandef.chan->center_freq) : 1;
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unsigned int chan_idx = channel - 1;
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u32 txpw = priv->channels[chan_idx].hw_value & 0xFF;
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u32 chan = max2820_chan[chan_idx];
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/* While philips SA2400 drive the PA bias from
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* sa2400, for MAXIM we do this directly from BB */
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rtl8180_write_phy(dev, 3, txpw);
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max2820_write_phy_antenna(dev, channel);
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write_max2820(dev, 3, chan);
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}
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static void max2820_rf_stop(struct ieee80211_hw *dev)
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{
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rtl8180_write_phy(dev, 3, 0x8);
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write_max2820(dev, 1, 0);
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}
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static void max2820_rf_init(struct ieee80211_hw *dev)
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{
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struct rtl8180_priv *priv = dev->priv;
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/* MAXIM from netbsd driver */
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write_max2820(dev, 0, 0x007); /* test mode as indicated in datasheet */
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write_max2820(dev, 1, 0x01e); /* enable register */
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write_max2820(dev, 2, 0x001); /* synt register */
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max2820_rf_set_channel(dev, NULL);
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write_max2820(dev, 4, 0x313); /* rx register */
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/* PA is driven directly by the BB, we keep the MAXIM bias
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* at the highest value in case that setting it to lower
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* values may introduce some further attenuation somewhere..
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*/
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write_max2820(dev, 5, 0x00f);
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/* baseband configuration */
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rtl8180_write_phy(dev, 0, 0x88); /* sys1 */
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rtl8180_write_phy(dev, 3, 0x08); /* txagc */
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rtl8180_write_phy(dev, 4, 0xf8); /* lnadet */
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rtl8180_write_phy(dev, 5, 0x90); /* ifagcinit */
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rtl8180_write_phy(dev, 6, 0x1a); /* ifagclimit */
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rtl8180_write_phy(dev, 7, 0x64); /* ifagcdet */
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max2820_write_phy_antenna(dev, 1);
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rtl8180_write_phy(dev, 0x11, 0x88); /* trl */
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if (rtl818x_ioread8(priv, &priv->map->CONFIG2) &
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RTL818X_CONFIG2_ANTENNA_DIV)
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rtl8180_write_phy(dev, 0x12, 0xc7);
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else
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rtl8180_write_phy(dev, 0x12, 0x47);
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rtl8180_write_phy(dev, 0x13, 0x9b);
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rtl8180_write_phy(dev, 0x19, 0x0); /* CHESTLIM */
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rtl8180_write_phy(dev, 0x1a, 0x9f); /* CHSQLIM */
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max2820_rf_set_channel(dev, NULL);
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}
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const struct rtl818x_rf_ops max2820_rf_ops = {
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.name = "Maxim",
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.init = max2820_rf_init,
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.stop = max2820_rf_stop,
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.set_chan = max2820_rf_set_channel,
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.calc_rssi = max2820_rf_calc_rssi,
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};
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