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path: root/drivers/net/wireless/rtl818x/rtl8180/max2820.c
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Diffstat (limited to 'drivers/net/wireless/rtl818x/rtl8180/max2820.c')
-rw-r--r--drivers/net/wireless/rtl818x/rtl8180/max2820.c169
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 000000000000..667b3363d437
--- /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->channel->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,
+};