bcm43xx_radio.c

无线网卡驱动,有很好的参考价值,在linux_2.6.21下可以直接使用,如果在其他平台,可以参考移植

/*

  Broadcom BCM43xx wireless driver

  Copyright (c) 2005 Martin Langer <[e-mail]>,
                     Stefano Brivio <[e-mail]>
                     Michael Buesch <[e-mail]>
                     Danny van Dyk <[e-mail]>
                     Andreas Jaggi <[e-mail]>

  Some parts of the code in this file are derived from the ipw2200
  driver  Copyright(c) 2003 - 2004 Intel Corporation.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; see the file COPYING.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Steet, Fifth Floor,
  Boston, MA 02110-1301, USA.

*/

#include <linux/delay.h>

#include "bcm43xx.h"
#include "bcm43xx_main.h"
#include "bcm43xx_phy.h"
#include "bcm43xx_radio.h"
#include "bcm43xx_ilt.h"


/* Table for bcm43xx_radio_calibrationvalue() */
static const u16 rcc_table[16] = {
	0x0002, 0x0003, 0x0001, 0x000F,
	0x0006, 0x0007, 0x0005, 0x000F,
	0x000A, 0x000B, 0x0009, 0x000F,
	0x000E, 0x000F, 0x000D, 0x000F,
};

/* Reverse the bits of a 4bit value.
 * Example:  1101 is flipped 1011
 */
static u16 flip_4bit(u16 value)
{
	u16 flipped = 0x0000;

	assert((value & ~0x000F) == 0x0000);

	flipped |= (value & 0x0001) << 3;
	flipped |= (value & 0x0002) << 1;
	flipped |= (value & 0x0004) >> 1;
	flipped |= (value & 0x0008) >> 3;

	return flipped;
}

/* Get the freq, as it has to be written to the device. */
static inline
u16 channel2freq_bg(u8 channel)
{
	/* Frequencies are given as frequencies_bg[index] + 2.4GHz
	 * Starting with channel 1
	 */
	static const u16 frequencies_bg[14] = {
		12, 17, 22, 27,
		32, 37, 42, 47,
		52, 57, 62, 67,
		72, 84,
	};

	assert(channel >= 1 && channel <= 14);

	return frequencies_bg[channel - 1];
}

/* Get the freq, as it has to be written to the device. */
static inline
u16 channel2freq_a(u8 channel)
{
	assert(channel <= 200);

	return (5000 + 5 * channel);
}

void bcm43xx_radio_lock(struct bcm43xx_private *bcm)
{
	u32 status;

	status = bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD);
	status |= BCM43xx_SBF_RADIOREG_LOCK;
	bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, status);
	mmiowb();
	udelay(10);
}

void bcm43xx_radio_unlock(struct bcm43xx_private *bcm)
{
	u32 status;

	bcm43xx_read16(bcm, BCM43xx_MMIO_PHY_VER); /* dummy read */
	status = bcm43xx_read32(bcm, BCM43xx_MMIO_STATUS_BITFIELD);
	status &= ~BCM43xx_SBF_RADIOREG_LOCK;
	bcm43xx_write32(bcm, BCM43xx_MMIO_STATUS_BITFIELD, status);
	mmiowb();
}

u16 bcm43xx_radio_read16(struct bcm43xx_private *bcm, u16 offset)
{
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);

	switch (phy->type) {
	case BCM43xx_PHYTYPE_A:
		offset |= 0x0040;
		break;
	case BCM43xx_PHYTYPE_B:
		if (radio->version == 0x2053) {
			if (offset < 0x70)
				offset += 0x80;
			else if (offset < 0x80)
				offset += 0x70;
		} else if (radio->version == 0x2050) {
			offset |= 0x80;
		} else
			assert(0);
		break;
	case BCM43xx_PHYTYPE_G:
		offset |= 0x80;
		break;
	}

	bcm43xx_write16(bcm, BCM43xx_MMIO_RADIO_CONTROL, offset);
	return bcm43xx_read16(bcm, BCM43xx_MMIO_RADIO_DATA_LOW);
}

void bcm43xx_radio_write16(struct bcm43xx_private *bcm, u16 offset, u16 val)
{
	bcm43xx_write16(bcm, BCM43xx_MMIO_RADIO_CONTROL, offset);
	mmiowb();
	bcm43xx_write16(bcm, BCM43xx_MMIO_RADIO_DATA_LOW, val);
}

static void bcm43xx_set_all_gains(struct bcm43xx_private *bcm,
				  s16 first, s16 second, s16 third)
{
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	u16 i;
	u16 start = 0x08, end = 0x18;
	u16 offset = 0x0400;
	u16 tmp;

	if (phy->rev <= 1) {
		offset = 0x5000;
		start = 0x10;
		end = 0x20;
	}

	for (i = 0; i < 4; i++)
		bcm43xx_ilt_write(bcm, offset + i, first);

	for (i = start; i < end; i++)
		bcm43xx_ilt_write(bcm, offset + i, second);

	if (third != -1) {
		tmp = ((u16)third << 14) | ((u16)third << 6);
		bcm43xx_phy_write(bcm, 0x04A0,
		                  (bcm43xx_phy_read(bcm, 0x04A0) & 0xBFBF) | tmp);
		bcm43xx_phy_write(bcm, 0x04A1,
		                  (bcm43xx_phy_read(bcm, 0x04A1) & 0xBFBF) | tmp);
		bcm43xx_phy_write(bcm, 0x04A2,
		                  (bcm43xx_phy_read(bcm, 0x04A2) & 0xBFBF) | tmp);
	}
	bcm43xx_dummy_transmission(bcm);
}

static void bcm43xx_set_original_gains(struct bcm43xx_private *bcm)
{
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	u16 i, tmp;
	u16 offset = 0x0400;
	u16 start = 0x0008, end = 0x0018;

	if (phy->rev <= 1) {
		offset = 0x5000;
		start = 0x0010;
		end = 0x0020;
	}

	for (i = 0; i < 4; i++) {
		tmp = (i & 0xFFFC);
		tmp |= (i & 0x0001) << 1;
		tmp |= (i & 0x0002) >> 1;

		bcm43xx_ilt_write(bcm, offset + i, tmp);
	}

	for (i = start; i < end; i++)
		bcm43xx_ilt_write(bcm, offset + i, i - start);

	bcm43xx_phy_write(bcm, 0x04A0,
	                  (bcm43xx_phy_read(bcm, 0x04A0) & 0xBFBF) | 0x4040);
	bcm43xx_phy_write(bcm, 0x04A1,
	                  (bcm43xx_phy_read(bcm, 0x04A1) & 0xBFBF) | 0x4040);
	bcm43xx_phy_write(bcm, 0x04A2,
	                  (bcm43xx_phy_read(bcm, 0x04A2) & 0xBFBF) | 0x4000);
	bcm43xx_dummy_transmission(bcm);
}

/* Synthetic PU workaround */
static void bcm43xx_synth_pu_workaround(struct bcm43xx_private *bcm, u8 channel)
{
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
	
	if (radio->version != 0x2050 || radio->revision >= 6) {
		/* We do not need the workaround. */
		return;
	}

	if (channel <= 10) {
		bcm43xx_write16(bcm, BCM43xx_MMIO_CHANNEL,
				channel2freq_bg(channel + 4));
	} else {
		bcm43xx_write16(bcm, BCM43xx_MMIO_CHANNEL,
				channel2freq_bg(1));
	}
	udelay(100);
	bcm43xx_write16(bcm, BCM43xx_MMIO_CHANNEL,
			channel2freq_bg(channel));
}

u8 bcm43xx_radio_aci_detect(struct bcm43xx_private *bcm, u8 channel)
{
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
	u8 ret = 0;
	u16 saved, rssi, temp;
	int i, j = 0;

	saved = bcm43xx_phy_read(bcm, 0x0403);
	bcm43xx_radio_selectchannel(bcm, channel, 0);
	bcm43xx_phy_write(bcm, 0x0403, (saved & 0xFFF8) | 5);
	if (radio->aci_hw_rssi)
		rssi = bcm43xx_phy_read(bcm, 0x048A) & 0x3F;
	else
		rssi = saved & 0x3F;
	/* clamp temp to signed 5bit */
	if (rssi > 32)
		rssi -= 64;
	for (i = 0;i < 100; i++) {
		temp = (bcm43xx_phy_read(bcm, 0x047F) >> 8) & 0x3F;
		if (temp > 32)
			temp -= 64;
		if (temp < rssi)
			j++;
		if (j >= 20)
			ret = 1;
	}
	bcm43xx_phy_write(bcm, 0x0403, saved);

	return ret;
}

u8 bcm43xx_radio_aci_scan(struct bcm43xx_private *bcm)
{
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
	u8 ret[13];
	unsigned int channel = radio->channel;
	unsigned int i, j, start, end;
	unsigned long phylock_flags;

	if (!((phy->type == BCM43xx_PHYTYPE_G) && (phy->rev > 0)))
		return 0;

	bcm43xx_phy_lock(bcm, phylock_flags);
	bcm43xx_radio_lock(bcm);
	bcm43xx_phy_write(bcm, 0x0802,
	                  bcm43xx_phy_read(bcm, 0x0802) & 0xFFFC);
	bcm43xx_phy_write(bcm, BCM43xx_PHY_G_CRS,
	                  bcm43xx_phy_read(bcm, BCM43xx_PHY_G_CRS) & 0x7FFF);
	bcm43xx_set_all_gains(bcm, 3, 8, 1);

	start = (channel - 5 > 0) ? channel - 5 : 1;
	end = (channel + 5 < 14) ? channel + 5 : 13;

	for (i = start; i <= end; i++) {
		if (abs(channel - i) > 2)
			ret[i-1] = bcm43xx_radio_aci_detect(bcm, i);
	}
	bcm43xx_radio_selectchannel(bcm, channel, 0);
	bcm43xx_phy_write(bcm, 0x0802,
	                  (bcm43xx_phy_read(bcm, 0x0802) & 0xFFFC) | 0x0003);
	bcm43xx_phy_write(bcm, 0x0403,
	                  bcm43xx_phy_read(bcm, 0x0403) & 0xFFF8);
	bcm43xx_phy_write(bcm, BCM43xx_PHY_G_CRS,
	                  bcm43xx_phy_read(bcm, BCM43xx_PHY_G_CRS) | 0x8000);
	bcm43xx_set_original_gains(bcm);
	for (i = 0; i < 13; i++) {
		if (!ret[i])
			continue;
		end = (i + 5 < 13) ? i + 5 : 13;
		for (j = i; j < end; j++)
			ret[j] = 1;
	}
	bcm43xx_radio_unlock(bcm);
	bcm43xx_phy_unlock(bcm, phylock_flags);

	return ret[channel - 1];
}

/* http://bcm-specs.sipsolutions.net/NRSSILookupTable */
void bcm43xx_nrssi_hw_write(struct bcm43xx_private *bcm, u16 offset, s16 val)
{
	bcm43xx_phy_write(bcm, BCM43xx_PHY_NRSSILT_CTRL, offset);
	mmiowb();
	bcm43xx_phy_write(bcm, BCM43xx_PHY_NRSSILT_DATA, (u16)val);
}

/* http://bcm-specs.sipsolutions.net/NRSSILookupTable */
s16 bcm43xx_nrssi_hw_read(struct bcm43xx_private *bcm, u16 offset)
{
	u16 val;

	bcm43xx_phy_write(bcm, BCM43xx_PHY_NRSSILT_CTRL, offset);
	val = bcm43xx_phy_read(bcm, BCM43xx_PHY_NRSSILT_DATA);

	return (s16)val;
}

/* http://bcm-specs.sipsolutions.net/NRSSILookupTable */
void bcm43xx_nrssi_hw_update(struct bcm43xx_private *bcm, u16 val)
{
	u16 i;
	s16 tmp;

	for (i = 0; i < 64; i++) {
		tmp = bcm43xx_nrssi_hw_read(bcm, i);
		tmp -= val;
		tmp = limit_value(tmp, -32, 31);
		bcm43xx_nrssi_hw_write(bcm, i, tmp);
	}
}

/* http://bcm-specs.sipsolutions.net/NRSSILookupTable */
void bcm43xx_nrssi_mem_update(struct bcm43xx_private *bcm)
{
	struct bcm43xx_radioinfo *radio = bcm43xx_current_radio(bcm);
	s16 i, delta;
	s32 tmp;

	delta = 0x1F - radio->nrssi[0];
	for (i = 0; i < 64; i++) {
		tmp = (i - delta) * radio->nrssislope;
		tmp /= 0x10000;
		tmp += 0x3A;
		tmp = limit_value(tmp, 0, 0x3F);
		radio->nrssi_lt[i] = tmp;
	}
}

static void bcm43xx_calc_nrssi_offset(struct bcm43xx_private *bcm)
{
	struct bcm43xx_phyinfo *phy = bcm43xx_current_phy(bcm);
	u16 backup[20] = { 0 };
	s16 v47F;
	u16 i;
	u16 saved = 0xFFFF;

	backup[0] = bcm43xx_phy_read(bcm, 0x0001);
	backup[1] = bcm43xx_phy_read(bcm, 0x0811);
	backup[2] = bcm43xx_phy_read(bcm, 0x0812);
	backup[3] = bcm43xx_phy_read(bcm, 0x0814);
	backup[4] = bcm43xx_phy_read(bcm, 0x0815);
	backup[5] = bcm43xx_phy_read(bcm, 0x005A);
	backup[6] = bcm43xx_phy_read(bcm, 0x0059);
	backup[7] = bcm43xx_phy_read(bcm, 0x0058);
	backup[8] = bcm43xx_phy_read(bcm, 0x000A);
	backup[9] = bcm43xx_phy_read(bcm, 0x0003);
	backup[10] = bcm43xx_radio_read16(bcm, 0x007A);
	backup[11] = bcm43xx_radio_read16(bcm, 0x0043);

	bcm43xx_phy_write(bcm, 0x0429,
			  bcm43xx_phy_read(bcm, 0x0429) & 0x7FFF);
	bcm43xx_phy_write(bcm, 0x0001,
			  (bcm43xx_phy_read(bcm, 0x0001) & 0x3FFF) | 0x4000);
	bcm43xx_phy_write(bcm, 0x0811,
			  bcm43xx_phy_read(bcm, 0x0811) | 0x000C);
	bcm43xx_phy_write(bcm, 0x0812,
			  (bcm43xx_phy_read(bcm, 0x0812) & 0xFFF3) | 0x0004);
	bcm43xx_phy_write(bcm, 0x0802,
			  bcm43xx_phy_read(bcm, 0x0802) & ~(0x1 | 0x2));
	if (phy->rev >= 6) {
		backup[12] = bcm43xx_phy_read(bcm, 0x002E);
		backup[13] = bcm43xx_phy_read(bcm, 0x002F);
		backup[14] = bcm43xx_phy_read(bcm, 0x080F);
		backup[15] = bcm43xx_phy_read(bcm, 0x0810);
		backup[16] = bcm43xx_phy_read(bcm, 0x0801);
		backup[17] = bcm43xx_phy_read(bcm, 0x0060);
		backup[18] = bcm43xx_phy_read(bcm, 0x0014);
		backup[19] = bcm43xx_phy_read(bcm, 0x0478);

		bcm43xx_phy_write(bcm, 0x002E, 0);
		bcm43xx_phy_write(bcm, 0x002F, 0);
		bcm43xx_phy_write(bcm, 0x080F, 0);
		bcm43xx_phy_write(bcm, 0x0810, 0);
		bcm43xx_phy_write(bcm, 0x0478,
				  bcm43xx_phy_read(bcm, 0x0478) | 0x0100);
		bcm43xx_phy_write(bcm, 0x0801,
				  bcm43xx_phy_read(bcm, 0x0801) | 0x0040);
		bcm43xx_phy_write(bcm, 0x0060,
				  bcm43xx_phy_read(bcm, 0x0060) | 0x0040);
		bcm43xx_phy_write(bcm, 0x0014,
				  bcm43xx_phy_read(bcm, 0x0014) | 0x0200);
	}
	bcm43xx_radio_write16(bcm, 0x007A,
			      bcm43xx_radio_read16(bcm, 0x007A) | 0x0070);
	bcm43xx_radio_write16(bcm, 0x007A,
			      bcm43xx_radio_read16(bcm, 0x007A) | 0x0080);
	udelay(30);

	v47F = (s16)((bcm43xx_phy_read(bcm, 0x047F) >> 8) & 0x003F);
	if (v47F >= 0x20)
		v47F -= 0x40;
	if (v47F == 31) {
		for (i = 7; i >= 4; i--) {
			bcm43xx_radio_write16(bcm, 0x007B, i);
			udelay(20);
			v47F = (s16)((bcm43xx_phy_read(bcm, 0x047F) >> 8) & 0x003F);
			if (v47F >= 0x20)
				v47F -= 0x40;
			if (v47F < 31 && saved == 0xFFFF)
				saved = i;
		}
		if (saved == 0xFFFF)
			saved = 4;
	} else {
		bcm43xx_radio_write16(bcm, 0x007A,
				      bcm43xx_radio_read16(bcm, 0x007A) & 0x007F);
		bcm43xx_phy_write(bcm, 0x0814,
				  bcm43xx_phy_read(bcm, 0x0814) | 0x0001);
		bcm43xx_phy_write(bcm, 0x0815,
				  bcm43xx_phy_read(bcm, 0x0815) & 0xFFFE);
		bcm43xx_phy_write(bcm, 0x0811,
				  bcm43xx_phy_read(bcm, 0x0811) | 0x000C);
		bcm43xx_phy_write(bcm, 0x0812,
				  bcm43xx_phy_read(bcm, 0x0812) | 0x000C);
		bcm43xx_phy_write(bcm, 0x0811,
				  bcm43xx_phy_read(bcm, 0x0811) | 0x0030);
		bcm43xx_phy_write(bcm, 0x0812,
				  bcm43xx_phy_read(bcm, 0x0812) | 0x0030);
		bcm43xx_phy_write(bcm, 0x005A, 0x0480);
		bcm43xx_phy_write(bcm, 0x0059, 0x0810);
		bcm43xx_phy_write(bcm, 0x0058, 0x000D);
		if (phy->analog == 0) {
			bcm43xx_phy_write(bcm, 0x0003, 0x0122);
		} else {
			bcm43xx_phy_write(bcm, 0x000A,
					  bcm43xx_phy_read(bcm, 0x000A)
					  | 0x2000);
		}
		bcm43xx_phy_write(bcm, 0x0814,
				  bcm43xx_phy_read(bcm, 0x0814) | 0x0004);
		bcm43xx_phy_write(bcm, 0x0815,
				  bcm43xx_phy_read(bcm, 0x0815) & 0xFFFB);
		bcm43xx_phy_write(bcm, 0x0003,
				  (bcm43xx_phy_read(bcm, 0x0003) & 0xFF9F)
				  | 0x0040);
		bcm43xx_radio_write16(bcm, 0x007A,
				      bcm43xx_radio_read16(bcm, 0x007A) | 0x000F);
		bcm43xx_set_all_gains(bcm, 3, 0, 1);
		bcm43xx_radio_write16(bcm, 0x0043,
				      (bcm43xx_radio_read16(bcm, 0x0043)
				       & 0x00F0) | 0x000F);
		udelay(30);
		v47F = (s16)((bcm43xx_phy_read(bcm, 0x047F) >> 8) & 0x003F);
		if (v47F >= 0x20)
			v47F -= 0x40;
		if (v47F == -32) {
			for (i = 0; i < 4; i++) {
				bcm43xx_radio_write16(bcm, 0x007B, i);
				udelay(20);
				v47F = (s16)((bcm43xx_phy_read(bcm, 0x047F) >> 8) & 0x003F);
				if (v47F >= 0x20)
					v47F -= 0x40;
				if (v47F > -31 && saved == 0xFFFF)
					saved = i;
			}
			if (saved == 0xFFFF)
				saved = 3;
		} else
			saved = 0;
	}
	bcm43xx_radio_write16(bcm, 0x007B, saved);

	if (phy->rev >= 6) {
		bcm43xx_phy_write(bcm, 0x002E, backup[12]);
		bcm43xx_phy_write(bcm, 0x002F, backup[13]);
		bcm43xx_phy_write(bcm, 0x080F, backup[14]);
		bcm43xx_phy_write(bcm, 0x0810, backup[15]);
	}