phy.c

linux内核源码

{
	struct b43legacy_lopair *pair;

	if (fixed) {
		/* Use fixed values. Only for initialization. */
		pair = b43legacy_find_lopair(dev, 2, 3, 0);
	} else
		pair = b43legacy_current_lopair(dev);
	b43legacy_lo_write(dev, pair);
}

static void b43legacy_phy_lo_g_measure_txctl2(struct b43legacy_wldev *dev)
{
	struct b43legacy_phy *phy = &dev->phy;
	u16 txctl2 = 0;
	u16 i;
	u32 smallest;
	u32 tmp;

	b43legacy_radio_write16(dev, 0x0052, 0x0000);
	udelay(10);
	smallest = b43legacy_phy_lo_g_singledeviation(dev, 0);
	for (i = 0; i < 16; i++) {
		b43legacy_radio_write16(dev, 0x0052, i);
		udelay(10);
		tmp = b43legacy_phy_lo_g_singledeviation(dev, 0);
		if (tmp < smallest) {
			smallest = tmp;
			txctl2 = i;
		}
	}
	phy->txctl2 = txctl2;
}

static
void b43legacy_phy_lo_g_state(struct b43legacy_wldev *dev,
			      const struct b43legacy_lopair *in_pair,
			      struct b43legacy_lopair *out_pair,
			      u16 r27)
{
	static const struct b43legacy_lopair transitions[8] = {
		{ .high =  1,  .low =  1, },
		{ .high =  1,  .low =  0, },
		{ .high =  1,  .low = -1, },
		{ .high =  0,  .low = -1, },
		{ .high = -1,  .low = -1, },
		{ .high = -1,  .low =  0, },
		{ .high = -1,  .low =  1, },
		{ .high =  0,  .low =  1, },
	};
	struct b43legacy_lopair lowest_transition = {
		.high = in_pair->high,
		.low = in_pair->low,
	};
	struct b43legacy_lopair tmp_pair;
	struct b43legacy_lopair transition;
	int i = 12;
	int state = 0;
	int found_lower;
	int j;
	int begin;
	int end;
	u32 lowest_deviation;
	u32 tmp;

	/* Note that in_pair and out_pair can point to the same pair.
	 * Be careful. */

	b43legacy_lo_write(dev, &lowest_transition);
	lowest_deviation = b43legacy_phy_lo_g_singledeviation(dev, r27);
	do {
		found_lower = 0;
		B43legacy_WARN_ON(!(state >= 0 && state <= 8));
		if (state == 0) {
			begin = 1;
			end = 8;
		} else if (state % 2 == 0) {
			begin = state - 1;
			end = state + 1;
		} else {
			begin = state - 2;
			end = state + 2;
		}
		if (begin < 1)
			begin += 8;
		if (end > 8)
			end -= 8;

		j = begin;
		tmp_pair.high = lowest_transition.high;
		tmp_pair.low = lowest_transition.low;
		while (1) {
			B43legacy_WARN_ON(!(j >= 1 && j <= 8));
			transition.high = tmp_pair.high +
					  transitions[j - 1].high;
			transition.low = tmp_pair.low + transitions[j - 1].low;
			if ((abs(transition.low) < 9)
			     && (abs(transition.high) < 9)) {
				b43legacy_lo_write(dev, &transition);
				tmp = b43legacy_phy_lo_g_singledeviation(dev,
								       r27);
				if (tmp < lowest_deviation) {
					lowest_deviation = tmp;
					state = j;
					found_lower = 1;

					lowest_transition.high =
								transition.high;
					lowest_transition.low = transition.low;
				}
			}
			if (j == end)
				break;
			if (j == 8)
				j = 1;
			else
				j++;
		}
	} while (i-- && found_lower);

	out_pair->high = lowest_transition.high;
	out_pair->low = lowest_transition.low;
}

/* Set the baseband attenuation value on chip. */
void b43legacy_phy_set_baseband_attenuation(struct b43legacy_wldev *dev,
					    u16 bbatt)
{
	struct b43legacy_phy *phy = &dev->phy;
	u16 value;

	if (phy->analog == 0) {
		value = (b43legacy_read16(dev, 0x03E6) & 0xFFF0);
		value |= (bbatt & 0x000F);
		b43legacy_write16(dev, 0x03E6, value);
		return;
	}

	if (phy->analog > 1) {
		value = b43legacy_phy_read(dev, 0x0060) & 0xFFC3;
		value |= (bbatt << 2) & 0x003C;
	} else {
		value = b43legacy_phy_read(dev, 0x0060) & 0xFF87;
		value |= (bbatt << 3) & 0x0078;
	}
	b43legacy_phy_write(dev, 0x0060, value);
}

/* http://bcm-specs.sipsolutions.net/LocalOscillator/Measure */
void b43legacy_phy_lo_g_measure(struct b43legacy_wldev *dev)
{
	static const u8 pairorder[10] = { 3, 1, 5, 7, 9, 2, 0, 4, 6, 8 };
	const int is_initializing = (b43legacy_status(dev)
				     < B43legacy_STAT_STARTED);
	struct b43legacy_phy *phy = &dev->phy;
	u16 h;
	u16 i;
	u16 oldi = 0;
	u16 j;
	struct b43legacy_lopair control;
	struct b43legacy_lopair *tmp_control;
	u16 tmp;
	u16 regstack[16] = { 0 };
	u8 oldchannel;

	/* XXX: What are these? */
	u8 r27 = 0;
	u16 r31;

	oldchannel = phy->channel;
	/* Setup */
	if (phy->gmode) {
		regstack[0] = b43legacy_phy_read(dev, B43legacy_PHY_G_CRS);
		regstack[1] = b43legacy_phy_read(dev, 0x0802);
		b43legacy_phy_write(dev, B43legacy_PHY_G_CRS, regstack[0]
				    & 0x7FFF);
		b43legacy_phy_write(dev, 0x0802, regstack[1] & 0xFFFC);
	}
	regstack[3] = b43legacy_read16(dev, 0x03E2);
	b43legacy_write16(dev, 0x03E2, regstack[3] | 0x8000);
	regstack[4] = b43legacy_read16(dev, B43legacy_MMIO_CHANNEL_EXT);
	regstack[5] = b43legacy_phy_read(dev, 0x15);
	regstack[6] = b43legacy_phy_read(dev, 0x2A);
	regstack[7] = b43legacy_phy_read(dev, 0x35);
	regstack[8] = b43legacy_phy_read(dev, 0x60);
	regstack[9] = b43legacy_radio_read16(dev, 0x43);
	regstack[10] = b43legacy_radio_read16(dev, 0x7A);
	regstack[11] = b43legacy_radio_read16(dev, 0x52);
	if (phy->gmode) {
		regstack[12] = b43legacy_phy_read(dev, 0x0811);
		regstack[13] = b43legacy_phy_read(dev, 0x0812);
		regstack[14] = b43legacy_phy_read(dev, 0x0814);
		regstack[15] = b43legacy_phy_read(dev, 0x0815);
	}
	b43legacy_radio_selectchannel(dev, 6, 0);
	if (phy->gmode) {
		b43legacy_phy_write(dev, B43legacy_PHY_G_CRS, regstack[0]
				    & 0x7FFF);
		b43legacy_phy_write(dev, 0x0802, regstack[1] & 0xFFFC);
		b43legacy_dummy_transmission(dev);
	}
	b43legacy_radio_write16(dev, 0x0043, 0x0006);

	b43legacy_phy_set_baseband_attenuation(dev, 2);

	b43legacy_write16(dev, B43legacy_MMIO_CHANNEL_EXT, 0x0000);
	b43legacy_phy_write(dev, 0x002E, 0x007F);
	b43legacy_phy_write(dev, 0x080F, 0x0078);
	b43legacy_phy_write(dev, 0x0035, regstack[7] & ~(1 << 7));
	b43legacy_radio_write16(dev, 0x007A, regstack[10] & 0xFFF0);
	b43legacy_phy_write(dev, 0x002B, 0x0203);
	b43legacy_phy_write(dev, 0x002A, 0x08A3);
	if (phy->gmode) {
		b43legacy_phy_write(dev, 0x0814, regstack[14] | 0x0003);
		b43legacy_phy_write(dev, 0x0815, regstack[15] & 0xFFFC);
		b43legacy_phy_write(dev, 0x0811, 0x01B3);
		b43legacy_phy_write(dev, 0x0812, 0x00B2);
	}
	if (is_initializing)
		b43legacy_phy_lo_g_measure_txctl2(dev);
	b43legacy_phy_write(dev, 0x080F, 0x8078);

	/* Measure */
	control.low = 0;
	control.high = 0;
	for (h = 0; h < 10; h++) {
		/* Loop over each possible RadioAttenuation (0-9) */
		i = pairorder[h];
		if (is_initializing) {
			if (i == 3) {
				control.low = 0;
				control.high = 0;
			} else if (((i % 2 == 1) && (oldi % 2 == 1)) ||
				  ((i % 2 == 0) && (oldi % 2 == 0))) {
				tmp_control = b43legacy_get_lopair(phy, oldi,
								   0);
				memcpy(&control, tmp_control, sizeof(control));
			} else {
				tmp_control = b43legacy_get_lopair(phy, 3, 0);
				memcpy(&control, tmp_control, sizeof(control));
			}
		}
		/* Loop over each possible BasebandAttenuation/2 */
		for (j = 0; j < 4; j++) {
			if (is_initializing) {
				tmp = i * 2 + j;
				r27 = 0;
				r31 = 0;
				if (tmp > 14) {
					r31 = 1;
					if (tmp > 17)
						r27 = 1;
					if (tmp > 19)
						r27 = 2;
				}
			} else {
				tmp_control = b43legacy_get_lopair(phy, i,
								   j * 2);
				if (!tmp_control->used)
					continue;
				memcpy(&control, tmp_control, sizeof(control));
				r27 = 3;
				r31 = 0;
			}
			b43legacy_radio_write16(dev, 0x43, i);
			b43legacy_radio_write16(dev, 0x52, phy->txctl2);
			udelay(10);
			b43legacy_voluntary_preempt();

			b43legacy_phy_set_baseband_attenuation(dev, j * 2);

			tmp = (regstack[10] & 0xFFF0);
			if (r31)
				tmp |= 0x0008;
			b43legacy_radio_write16(dev, 0x007A, tmp);

			tmp_control = b43legacy_get_lopair(phy, i, j * 2);
			b43legacy_phy_lo_g_state(dev, &control, tmp_control,
						 r27);
		}
		oldi = i;
	}
	/* Loop over each possible RadioAttenuation (10-13) */
	for (i = 10; i < 14; i++) {
		/* Loop over each possible BasebandAttenuation/2 */
		for (j = 0; j < 4; j++) {
			if (is_initializing) {
				tmp_control = b43legacy_get_lopair(phy, i - 9,
								 j * 2);
				memcpy(&control, tmp_control, sizeof(control));
				/* FIXME: The next line is wrong, as the
				 * following if statement can never trigger. */
				tmp = (i - 9) * 2 + j - 5;
				r27 = 0;
				r31 = 0;
				if (tmp > 14) {
					r31 = 1;
					if (tmp > 17)
						r27 = 1;
					if (tmp > 19)
						r27 = 2;
				}
			} else {
				tmp_control = b43legacy_get_lopair(phy, i - 9,
								   j * 2);
				if (!tmp_control->used)
					continue;
				memcpy(&control, tmp_control, sizeof(control));
				r27 = 3;
				r31 = 0;
			}
			b43legacy_radio_write16(dev, 0x43, i - 9);
			/* FIXME: shouldn't txctl1 be zero in the next line
			 * and 3 in the loop above? */
			b43legacy_radio_write16(dev, 0x52,
					      phy->txctl2
					      | (3/*txctl1*/ << 4));
			udelay(10);
			b43legacy_voluntary_preempt();

			b43legacy_phy_set_baseband_attenuation(dev, j * 2);

			tmp = (regstack[10] & 0xFFF0);
			if (r31)
				tmp |= 0x0008;
			b43legacy_radio_write16(dev, 0x7A, tmp);

			tmp_control = b43legacy_get_lopair(phy, i, j * 2);
			b43legacy_phy_lo_g_state(dev, &control, tmp_control,
						 r27);
		}
	}

	/* Restoration */
	if (phy->gmode) {
		b43legacy_phy_write(dev, 0x0015, 0xE300);
		b43legacy_phy_write(dev, 0x0812, (r27 << 8) | 0xA0);
		udelay(5);
		b43legacy_phy_write(dev, 0x0812, (r27 << 8) | 0xA2);
		udelay(2);
		b43legacy_phy_write(dev, 0x0812, (r27 << 8) | 0xA3);
		b43legacy_voluntary_preempt();
	} else
		b43legacy_phy_write(dev, 0x0015, r27 | 0xEFA0);
	b43legacy_phy_lo_adjust(dev, is_initializing);
	b43legacy_phy_write(dev, 0x002E, 0x807F);
	if (phy->gmode)
		b43legacy_phy_write(dev, 0x002F, 0x0202);
	else
		b43legacy_phy_write(dev, 0x002F, 0x0101);
	b43legacy_write16(dev, B43legacy_MMIO_CHANNEL_EXT, regstack[4]);
	b43legacy_phy_write(dev, 0x0015, regstack[5]);
	b43legacy_phy_write(dev, 0x002A, regstack[6]);
	b43legacy_phy_write(dev, 0x0035, regstack[7]);
	b43legacy_phy_write(dev, 0x0060, regstack[8]);
	b43legacy_radio_write16(dev, 0x0043, regstack[9]);
	b43legacy_radio_write16(dev, 0x007A, regstack[10]);
	regstack[11] &= 0x00F0;
	regstack[11] |= (b43legacy_radio_read16(dev, 0x52) & 0x000F);
	b43legacy_radio_write16(dev, 0x52, regstack[11]);
	b43legacy_write16(dev, 0x03E2, regstack[3]);
	if (phy->gmode) {
		b43legacy_phy_write(dev, 0x0811, regstack[12]);
		b43legacy_phy_write(dev, 0x0812, regstack[13]);
		b43legacy_phy_write(dev, 0x0814, regstack[14]);
		b43legacy_phy_write(dev, 0x0815, regstack[15]);
		b43legacy_phy_write(dev, B43legacy_PHY_G_CRS, regstack[0]);
		b43legacy_phy_write(dev, 0x0802, regstack[1]);
	}
	b43legacy_radio_selectchannel(dev, oldchannel, 1);

#ifdef CONFIG_B43LEGACY_DEBUG
	{
		/* Sanity check for all lopairs. */
		for (i = 0; i < B43legacy_LO_COUNT; i++) {
			tmp_control = phy->_lo_pairs + i;
			if (tmp_control->low < -8 || tmp_control->low > 8 ||
			    tmp_control->high < -8 || tmp_control->high > 8)
				b43legacywarn(dev->wl,
				       "WARNING: Invalid LOpair (low: %d, high:"
				       " %d, index: %d)\n",
				       tmp_control->low, tmp_control->high, i);
		}
	}
#endif /* CONFIG_B43LEGACY_DEBUG */
}

static
void b43legacy_phy_lo_mark_current_used(struct b43legacy_wldev *dev)
{
	struct b43legacy_lopair *pair;

	pair = b43legacy_current_lopair(dev);
	pair->used = 1;
}

void b43legacy_phy_lo_mark_all_unused(struct b43legacy_wldev *dev)
{
	struct b43legacy_phy *phy = &dev->phy;
	struct b43legacy_lopair *pair;
	int i;

	for (i = 0; i < B43legacy_LO_COUNT; i++) {
		pair = phy->_lo_pairs + i;
		pair->used = 0;
	}
}

/* http://bcm-specs.sipsolutions.net/EstimatePowerOut
 * This function converts a TSSI value to dBm in Q5.2
 */
static s8 b43legacy_phy_estimate_power_out(struct b43legacy_wldev *dev, s8 tssi)
{
	struct b43legacy_phy *phy = &dev->phy;
	s8 dbm = 0;
	s32 tmp;

	tmp = phy->idle_tssi;
	tmp += tssi;
	tmp -= phy->savedpctlreg;

	switch (phy->type) {
	case B43legacy_PHYTYPE_B:
	case B43legacy_PHYTYPE_G:
		tmp = limit_value(tmp, 0x00, 0x3F);
		dbm = phy->tssi2dbm[tmp];
		break;
	default:
		B43legacy_BUG_ON(1);
	}

	return dbm;
}

/* http://bcm-specs.sipsolutions.net/RecalculateTransmissionPower */
void b43legacy_phy_xmitpower(struct b43legacy_wldev *dev)
{
	struct b43legacy_phy *phy = &dev->phy;
	u16 tmp;
	u16 txpower;
	s8 v0;
	s8 v1;
	s8 v2;
	s8 v3;
	s8 average;
	int max_pwr;