fishHEADmaster

1 files changed, 169 insertions, 0 deletions

diff --git a/drivers/net/wireless/rtl818x/rtl8180/max2820.c b/drivers/net/wireless/rtl818x/rtl8180/max2820.c
new file mode 100644
index 0000000..4715000
--- /dev/null
+++ b/drivers/net/wireless/rtl818x/rtl8180/max2820.c
@@ -0,0 +1,169 @@
+/*
+ * Radio tuning for Maxim max2820 on RTL8180
+ *
+ * Copyright 2007 Andrea Merello <andreamrl@tiscali.it>
+ *
+ * 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!
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#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,
+};