radio.c

linux内核源码

/*

  Broadcom B43legacy 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]>
  Copyright (c) 2007 Larry Finger <[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 "b43legacy.h"
#include "main.h"
#include "phy.h"
#include "radio.h"
#include "ilt.h"


/* Table for b43legacy_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;

	B43legacy_BUG_ON(!((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,
	};

	if (unlikely(channel < 1 || channel > 14)) {
		printk(KERN_INFO "b43legacy: Channel %d is out of range\n",
				  channel);
		dump_stack();
		return 2412;
	}

	return frequencies_bg[channel - 1];
}

void b43legacy_radio_lock(struct b43legacy_wldev *dev)
{
	u32 status;

	status = b43legacy_read32(dev, B43legacy_MMIO_STATUS_BITFIELD);
	status |= B43legacy_SBF_RADIOREG_LOCK;
	b43legacy_write32(dev, B43legacy_MMIO_STATUS_BITFIELD, status);
	mmiowb();
	udelay(10);
}

void b43legacy_radio_unlock(struct b43legacy_wldev *dev)
{
	u32 status;

	b43legacy_read16(dev, B43legacy_MMIO_PHY_VER); /* dummy read */
	status = b43legacy_read32(dev, B43legacy_MMIO_STATUS_BITFIELD);
	status &= ~B43legacy_SBF_RADIOREG_LOCK;
	b43legacy_write32(dev, B43legacy_MMIO_STATUS_BITFIELD, status);
	mmiowb();
}

u16 b43legacy_radio_read16(struct b43legacy_wldev *dev, u16 offset)
{
	struct b43legacy_phy *phy = &dev->phy;

	switch (phy->type) {
	case B43legacy_PHYTYPE_B:
		if (phy->radio_ver == 0x2053) {
			if (offset < 0x70)
				offset += 0x80;
			else if (offset < 0x80)
				offset += 0x70;
		} else if (phy->radio_ver == 0x2050)
			offset |= 0x80;
		else
			B43legacy_WARN_ON(1);
		break;
	case B43legacy_PHYTYPE_G:
		offset |= 0x80;
		break;
	default:
		B43legacy_BUG_ON(1);
	}

	b43legacy_write16(dev, B43legacy_MMIO_RADIO_CONTROL, offset);
	return b43legacy_read16(dev, B43legacy_MMIO_RADIO_DATA_LOW);
}

void b43legacy_radio_write16(struct b43legacy_wldev *dev, u16 offset, u16 val)
{
	b43legacy_write16(dev, B43legacy_MMIO_RADIO_CONTROL, offset);
	mmiowb();
	b43legacy_write16(dev, B43legacy_MMIO_RADIO_DATA_LOW, val);
}

static void b43legacy_set_all_gains(struct b43legacy_wldev *dev,
				  s16 first, s16 second, s16 third)
{
	struct b43legacy_phy *phy = &dev->phy;
	u16 i;
	u16 start = 0x08;
	u16 end = 0x18;
	u16 offset = 0x0400;
	u16 tmp;

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

	for (i = 0; i < 4; i++)
		b43legacy_ilt_write(dev, offset + i, first);

	for (i = start; i < end; i++)
		b43legacy_ilt_write(dev, offset + i, second);

	if (third != -1) {
		tmp = ((u16)third << 14) | ((u16)third << 6);
		b43legacy_phy_write(dev, 0x04A0,
				    (b43legacy_phy_read(dev, 0x04A0) & 0xBFBF)
				    | tmp);
		b43legacy_phy_write(dev, 0x04A1,
				    (b43legacy_phy_read(dev, 0x04A1) & 0xBFBF)
				    | tmp);
		b43legacy_phy_write(dev, 0x04A2,
				    (b43legacy_phy_read(dev, 0x04A2) & 0xBFBF)
				    | tmp);
	}
	b43legacy_dummy_transmission(dev);
}

static void b43legacy_set_original_gains(struct b43legacy_wldev *dev)
{
	struct b43legacy_phy *phy = &dev->phy;
	u16 i;
	u16 tmp;
	u16 offset = 0x0400;
	u16 start = 0x0008;
	u16 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;

		b43legacy_ilt_write(dev, offset + i, tmp);
	}

	for (i = start; i < end; i++)
		b43legacy_ilt_write(dev, offset + i, i - start);

	b43legacy_phy_write(dev, 0x04A0,
			    (b43legacy_phy_read(dev, 0x04A0) & 0xBFBF)
			    | 0x4040);
	b43legacy_phy_write(dev, 0x04A1,
			    (b43legacy_phy_read(dev, 0x04A1) & 0xBFBF)
			    | 0x4040);
	b43legacy_phy_write(dev, 0x04A2,
			    (b43legacy_phy_read(dev, 0x04A2) & 0xBFBF)
			    | 0x4000);
	b43legacy_dummy_transmission(dev);
}

/* Synthetic PU workaround */
static void b43legacy_synth_pu_workaround(struct b43legacy_wldev *dev,
					  u8 channel)
{
	struct b43legacy_phy *phy = &dev->phy;

	might_sleep();

	if (phy->radio_ver != 0x2050 || phy->radio_rev >= 6)
		/* We do not need the workaround. */
		return;

	if (channel <= 10)
		b43legacy_write16(dev, B43legacy_MMIO_CHANNEL,
				  channel2freq_bg(channel + 4));
	else
		b43legacy_write16(dev, B43legacy_MMIO_CHANNEL,
				  channel2freq_bg(channel));
	msleep(1);
	b43legacy_write16(dev, B43legacy_MMIO_CHANNEL,
			  channel2freq_bg(channel));
}

u8 b43legacy_radio_aci_detect(struct b43legacy_wldev *dev, u8 channel)
{
	struct b43legacy_phy *phy = &dev->phy;
	u8 ret = 0;
	u16 saved;
	u16 rssi;
	u16 temp;
	int i;
	int j = 0;

	saved = b43legacy_phy_read(dev, 0x0403);
	b43legacy_radio_selectchannel(dev, channel, 0);
	b43legacy_phy_write(dev, 0x0403, (saved & 0xFFF8) | 5);
	if (phy->aci_hw_rssi)
		rssi = b43legacy_phy_read(dev, 0x048A) & 0x3F;
	else
		rssi = saved & 0x3F;
	/* clamp temp to signed 5bit */
	if (rssi > 32)
		rssi -= 64;
	for (i = 0; i < 100; i++) {
		temp = (b43legacy_phy_read(dev, 0x047F) >> 8) & 0x3F;
		if (temp > 32)
			temp -= 64;
		if (temp < rssi)
			j++;
		if (j >= 20)
			ret = 1;
	}
	b43legacy_phy_write(dev, 0x0403, saved);

	return ret;
}

u8 b43legacy_radio_aci_scan(struct b43legacy_wldev *dev)
{
	struct b43legacy_phy *phy = &dev->phy;
	u8 ret[13];
	unsigned int channel = phy->channel;
	unsigned int i;
	unsigned int j;
	unsigned int start;
	unsigned int end;
	unsigned long phylock_flags;

	if (!((phy->type == B43legacy_PHYTYPE_G) && (phy->rev > 0)))
		return 0;

	b43legacy_phy_lock(dev, phylock_flags);
	b43legacy_radio_lock(dev);
	b43legacy_phy_write(dev, 0x0802,
			    b43legacy_phy_read(dev, 0x0802) & 0xFFFC);
	b43legacy_phy_write(dev, B43legacy_PHY_G_CRS,
			    b43legacy_phy_read(dev, B43legacy_PHY_G_CRS)
			    & 0x7FFF);
	b43legacy_set_all_gains(dev, 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] = b43legacy_radio_aci_detect(dev, i);
	}
	b43legacy_radio_selectchannel(dev, channel, 0);
	b43legacy_phy_write(dev, 0x0802,
			    (b43legacy_phy_read(dev, 0x0802) & 0xFFFC)
			    | 0x0003);
	b43legacy_phy_write(dev, 0x0403,
			    b43legacy_phy_read(dev, 0x0403) & 0xFFF8);
	b43legacy_phy_write(dev, B43legacy_PHY_G_CRS,
			    b43legacy_phy_read(dev, B43legacy_PHY_G_CRS)
			    | 0x8000);
	b43legacy_set_original_gains(dev);
	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;
	}
	b43legacy_radio_unlock(dev);
	b43legacy_phy_unlock(dev, phylock_flags);

	return ret[channel - 1];
}

/* http://bcm-specs.sipsolutions.net/NRSSILookupTable */
void b43legacy_nrssi_hw_write(struct b43legacy_wldev *dev, u16 offset, s16 val)
{
	b43legacy_phy_write(dev, B43legacy_PHY_NRSSILT_CTRL, offset);
	mmiowb();
	b43legacy_phy_write(dev, B43legacy_PHY_NRSSILT_DATA, (u16)val);
}

/* http://bcm-specs.sipsolutions.net/NRSSILookupTable */
s16 b43legacy_nrssi_hw_read(struct b43legacy_wldev *dev, u16 offset)
{
	u16 val;

	b43legacy_phy_write(dev, B43legacy_PHY_NRSSILT_CTRL, offset);
	val = b43legacy_phy_read(dev, B43legacy_PHY_NRSSILT_DATA);

	return (s16)val;
}

/* http://bcm-specs.sipsolutions.net/NRSSILookupTable */
void b43legacy_nrssi_hw_update(struct b43legacy_wldev *dev, u16 val)
{
	u16 i;
	s16 tmp;

	for (i = 0; i < 64; i++) {
		tmp = b43legacy_nrssi_hw_read(dev, i);
		tmp -= val;
		tmp = limit_value(tmp, -32, 31);
		b43legacy_nrssi_hw_write(dev, i, tmp);
	}
}

/* http://bcm-specs.sipsolutions.net/NRSSILookupTable */
void b43legacy_nrssi_mem_update(struct b43legacy_wldev *dev)
{
	struct b43legacy_phy *phy = &dev->phy;
	s16 i;
	s16 delta;
	s32 tmp;

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

static void b43legacy_calc_nrssi_offset(struct b43legacy_wldev *dev)
{
	struct b43legacy_phy *phy = &dev->phy;
	u16 backup[20] = { 0 };
	s16 v47F;
	u16 i;
	u16 saved = 0xFFFF;

	backup[0] = b43legacy_phy_read(dev, 0x0001);
	backup[1] = b43legacy_phy_read(dev, 0x0811);
	backup[2] = b43legacy_phy_read(dev, 0x0812);
	backup[3] = b43legacy_phy_read(dev, 0x0814);
	backup[4] = b43legacy_phy_read(dev, 0x0815);
	backup[5] = b43legacy_phy_read(dev, 0x005A);
	backup[6] = b43legacy_phy_read(dev, 0x0059);
	backup[7] = b43legacy_phy_read(dev, 0x0058);
	backup[8] = b43legacy_phy_read(dev, 0x000A);
	backup[9] = b43legacy_phy_read(dev, 0x0003);
	backup[10] = b43legacy_radio_read16(dev, 0x007A);
	backup[11] = b43legacy_radio_read16(dev, 0x0043);

	b43legacy_phy_write(dev, 0x0429,
			    b43legacy_phy_read(dev, 0x0429) & 0x7FFF);
	b43legacy_phy_write(dev, 0x0001,
			    (b43legacy_phy_read(dev, 0x0001) & 0x3FFF)
			    | 0x4000);
	b43legacy_phy_write(dev, 0x0811,
			    b43legacy_phy_read(dev, 0x0811) | 0x000C);
	b43legacy_phy_write(dev, 0x0812,
			    (b43legacy_phy_read(dev, 0x0812) & 0xFFF3)
			    | 0x0004);
	b43legacy_phy_write(dev, 0x0802,
			    b43legacy_phy_read(dev, 0x0802) & ~(0x1 | 0x2));
	if (phy->rev >= 6) {
		backup[12] = b43legacy_phy_read(dev, 0x002E);
		backup[13] = b43legacy_phy_read(dev, 0x002F);
		backup[14] = b43legacy_phy_read(dev, 0x080F);
		backup[15] = b43legacy_phy_read(dev, 0x0810);
		backup[16] = b43legacy_phy_read(dev, 0x0801);
		backup[17] = b43legacy_phy_read(dev, 0x0060);
		backup[18] = b43legacy_phy_read(dev, 0x0014);
		backup[19] = b43legacy_phy_read(dev, 0x0478);

		b43legacy_phy_write(dev, 0x002E, 0);
		b43legacy_phy_write(dev, 0x002F, 0);
		b43legacy_phy_write(dev, 0x080F, 0);
		b43legacy_phy_write(dev, 0x0810, 0);
		b43legacy_phy_write(dev, 0x0478,
				    b43legacy_phy_read(dev, 0x0478) | 0x0100);
		b43legacy_phy_write(dev, 0x0801,
				    b43legacy_phy_read(dev, 0x0801) | 0x0040);
		b43legacy_phy_write(dev, 0x0060,
				    b43legacy_phy_read(dev, 0x0060) | 0x0040);
		b43legacy_phy_write(dev, 0x0014,
				    b43legacy_phy_read(dev, 0x0014) | 0x0200);
	}
	b43legacy_radio_write16(dev, 0x007A,
				b43legacy_radio_read16(dev, 0x007A) | 0x0070);
	b43legacy_radio_write16(dev, 0x007A,
				b43legacy_radio_read16(dev, 0x007A) | 0x0080);
	udelay(30);

	v47F = (s16)((b43legacy_phy_read(dev, 0x047F) >> 8) & 0x003F);
	if (v47F >= 0x20)
		v47F -= 0x40;
	if (v47F == 31) {
		for (i = 7; i >= 4; i--) {
			b43legacy_radio_write16(dev, 0x007B, i);
			udelay(20);
			v47F = (s16)((b43legacy_phy_read(dev, 0x047F) >> 8)
							 & 0x003F);
			if (v47F >= 0x20)
				v47F -= 0x40;
			if (v47F < 31 && saved == 0xFFFF)
				saved = i;
		}
		if (saved == 0xFFFF)
			saved = 4;
	} else {
		b43legacy_radio_write16(dev, 0x007A,
					b43legacy_radio_read16(dev, 0x007A)
					& 0x007F);
		b43legacy_phy_write(dev, 0x0814,
				    b43legacy_phy_read(dev, 0x0814) | 0x0001);
		b43legacy_phy_write(dev, 0x0815,
				    b43legacy_phy_read(dev, 0x0815) & 0xFFFE);
		b43legacy_phy_write(dev, 0x0811,
				    b43legacy_phy_read(dev, 0x0811) | 0x000C);
		b43legacy_phy_write(dev, 0x0812,
				    b43legacy_phy_read(dev, 0x0812) | 0x000C);
		b43legacy_phy_write(dev, 0x0811,
				    b43legacy_phy_read(dev, 0x0811) | 0x0030);
		b43legacy_phy_write(dev, 0x0812,
				    b43legacy_phy_read(dev, 0x0812) | 0x0030);
		b43legacy_phy_write(dev, 0x005A, 0x0480);
		b43legacy_phy_write(dev, 0x0059, 0x0810);
		b43legacy_phy_write(dev, 0x0058, 0x000D);
		if (phy->analog == 0)
			b43legacy_phy_write(dev, 0x0003, 0x0122);
		else
			b43legacy_phy_write(dev, 0x000A,
					    b43legacy_phy_read(dev, 0x000A)
					    | 0x2000);
		b43legacy_phy_write(dev, 0x0814,
				    b43legacy_phy_read(dev, 0x0814) | 0x0004);
		b43legacy_phy_write(dev, 0x0815,
				    b43legacy_phy_read(dev, 0x0815) & 0xFFFB);
		b43legacy_phy_write(dev, 0x0003,
				    (b43legacy_phy_read(dev, 0x0003) & 0xFF9F)
				    | 0x0040);
		b43legacy_radio_write16(dev, 0x007A,
					b43legacy_radio_read16(dev, 0x007A)
					| 0x000F);
		b43legacy_set_all_gains(dev, 3, 0, 1);
		b43legacy_radio_write16(dev, 0x0043,
					(b43legacy_radio_read16(dev, 0x0043)
					& 0x00F0) | 0x000F);
		udelay(30);
		v47F = (s16)((b43legacy_phy_read(dev, 0x047F) >> 8) & 0x003F);
		if (v47F >= 0x20)
			v47F -= 0x40;
		if (v47F == -32) {
			for (i = 0; i < 4; i++) {
				b43legacy_radio_write16(dev, 0x007B, i);
				udelay(20);
				v47F = (s16)((b43legacy_phy_read(dev, 0x047F) >>
								 8) & 0x003F);
				if (v47F >= 0x20)
					v47F -= 0x40;
				if (v47F > -31 && saved == 0xFFFF)
					saved = i;
			}
			if (saved == 0xFFFF)
				saved = 3;
		} else
			saved = 0;
	}
	b43legacy_radio_write16(dev, 0x007B, saved);

	if (phy->rev >= 6) {
		b43legacy_phy_write(dev, 0x002E, backup[12]);
		b43legacy_phy_write(dev, 0x002F, backup[13]);
		b43legacy_phy_write(dev, 0x080F, backup[14]);
		b43legacy_phy_write(dev, 0x0810, backup[15]);
	}
	b43legacy_phy_write(dev, 0x0814, backup[3]);
	b43legacy_phy_write(dev, 0x0815, backup[4]);
	b43legacy_phy_write(dev, 0x005A, backup[5]);
	b43legacy_phy_write(dev, 0x0059, backup[6]);
	b43legacy_phy_write(dev, 0x0058, backup[7]);
	b43legacy_phy_write(dev, 0x000A, backup[8]);
	b43legacy_phy_write(dev, 0x0003, backup[9]);
	b43legacy_radio_write16(dev, 0x0043, backup[11]);
	b43legacy_radio_write16(dev, 0x007A, backup[10]);
	b43legacy_phy_write(dev, 0x0802,
			    b43legacy_phy_read(dev, 0x0802) | 0x1 | 0x2);
	b43legacy_phy_write(dev, 0x0429,
			    b43legacy_phy_read(dev, 0x0429) | 0x8000);
	b43legacy_set_original_gains(dev);